TY  - JOUR
AU  - Thiry, Marc
AU  - Boldt, Klaus
AU  - Nikolić, Marija
AU  - Schulz, Florian
AU  - Ijeh, Michael
AU  - Panicker, Andjana
AU  - Vossmeyer, Tobias
AU  - Weller, Horst
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1884
AB  - In this contribution a facile, one-step synthesis of tridentate thiol-functionalized PEO ligands and their ability to stabilize CdSe/CdS/ZnS core-shell-shell nanoparticles In aqueous media are described. The PEO-coated quantum dots show colloidal stability as well as preserved fluorescence even at very low concentrations of a few nM. For improved ligand attachment and enhanced fluorescence properties a method for ligand exchange was developed, which includes formation of a ligand zinc complex before the actual exchange reaction. The stability and fluorescence properties in various aqueous buffers and cell media and at pH values down to pH 3 were investigated. The firm binding of the tridentate ligands to the particle surface makes this ligand particle system a promising tool for biological applications. In addition, activation of the ligands' terminal hydroxyl group for covalent biofunctionalization by esterification with succinic acid is reported.
PB  - Amer Chemical Soc, Washington
T2  - ACS Nano
T1  - Fluorescence Properties of Hydrophilic Semiconductor Nanoparticles with Tridentate Polyethylene Oxide Ligands
EP  - 4973
IS  - 6
SP  - 4965
VL  - 5
DO  - 10.1021/nn201065y
ER  - 

@article{
author = "Thiry, Marc and Boldt, Klaus and Nikolić, Marija and Schulz, Florian and Ijeh, Michael and Panicker, Andjana and Vossmeyer, Tobias and Weller, Horst",
year = "2011",
abstract = "In this contribution a facile, one-step synthesis of tridentate thiol-functionalized PEO ligands and their ability to stabilize CdSe/CdS/ZnS core-shell-shell nanoparticles In aqueous media are described. The PEO-coated quantum dots show colloidal stability as well as preserved fluorescence even at very low concentrations of a few nM. For improved ligand attachment and enhanced fluorescence properties a method for ligand exchange was developed, which includes formation of a ligand zinc complex before the actual exchange reaction. The stability and fluorescence properties in various aqueous buffers and cell media and at pH values down to pH 3 were investigated. The firm binding of the tridentate ligands to the particle surface makes this ligand particle system a promising tool for biological applications. In addition, activation of the ligands' terminal hydroxyl group for covalent biofunctionalization by esterification with succinic acid is reported.",
publisher = "Amer Chemical Soc, Washington",
journal = "ACS Nano",
title = "Fluorescence Properties of Hydrophilic Semiconductor Nanoparticles with Tridentate Polyethylene Oxide Ligands",
pages = "4973-4965",
number = "6",
volume = "5",
doi = "10.1021/nn201065y"
}

Thiry, M., Boldt, K., Nikolić, M., Schulz, F., Ijeh, M., Panicker, A., Vossmeyer, T.,& Weller, H.. (2011). Fluorescence Properties of Hydrophilic Semiconductor Nanoparticles with Tridentate Polyethylene Oxide Ligands. in ACS Nano
Amer Chemical Soc, Washington., 5(6), 4965-4973.
https://doi.org/10.1021/nn201065y

Thiry M, Boldt K, Nikolić M, Schulz F, Ijeh M, Panicker A, Vossmeyer T, Weller H. Fluorescence Properties of Hydrophilic Semiconductor Nanoparticles with Tridentate Polyethylene Oxide Ligands. in ACS Nano. 2011;5(6):4965-4973.
doi:10.1021/nn201065y .

Thiry, Marc, Boldt, Klaus, Nikolić, Marija, Schulz, Florian, Ijeh, Michael, Panicker, Andjana, Vossmeyer, Tobias, Weller, Horst, "Fluorescence Properties of Hydrophilic Semiconductor Nanoparticles with Tridentate Polyethylene Oxide Ligands" in ACS Nano, 5, no. 6 (2011):4965-4973,
https://doi.org/10.1021/nn201065y . .

TY  - JOUR
AU  - Salcher, Andrea
AU  - Nikolić, Marija
AU  - Casado, Santiago
AU  - Velez, Marisela
AU  - Weller, Horst
AU  - Juarez, Beatriz H.
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1687
AB  - In this work, CdSe/CdS semiconductor ligand-exchanged nanoparticles have been immobilized on poly-(N-isopropylacrylamide) (pNIPAM)-based microspheres. The size and the shrinkage capacity of the spheres can be tuned by the ratio of NIPAM/styrene (pNIPAM-PS spheres) or NIPAM/BIS (N-N'-methylene-bis-acrylamide) and MA (maleic acid) (pNIPAM-BIS-MA spheres). A ligand-exchange procedure for the transfer of initially organic compatible nanoparticles into aqueous solution using amine-modified or thiol-modified poly(ethylene oxide)s (PEOs) has been carried out prior to their immobilization. We observed that the interaction of the nanoparticles with the pNIPAM-based system depends on the nature of the ligands and the chemical composition of the microspheres. Nanoparticles capped with amine-or mercapto-poly(ethylene oxide) s ligands interact with pNIPAM-PS beads while only amine-capped ones show a clear tendency to interact with pNIPAM containing acid groups which leads to a high nanoparticle coverage. Dynamic light scattering measurements, atomic force microscopy and optical spectroscopy hint that nanoparticles are placed on the surface of pNIPAM-BIS-MA beads while being partially incorporated into pNIPAM-PS network. Cell culture studies demonstrate that the fluorescent composites show non-specific binding to fibroblasts. These features may be very valuable to develop materials for drug delivery and specific targeting of cells combined with the outstanding optical properties of semiconductor nanoparticles as fluorescent labelers.
PB  - Royal Soc Chemistry, Cambridge
T2  - Journal of Materials Chemistry
T1  - CdSe/CdS nanoparticles immobilized on pNIPAm-based microspheres
EP  - 1374
IS  - 7
SP  - 1367
VL  - 20
DO  - 10.1039/b917022g
ER  - 

@article{
author = "Salcher, Andrea and Nikolić, Marija and Casado, Santiago and Velez, Marisela and Weller, Horst and Juarez, Beatriz H.",
year = "2010",
abstract = "In this work, CdSe/CdS semiconductor ligand-exchanged nanoparticles have been immobilized on poly-(N-isopropylacrylamide) (pNIPAM)-based microspheres. The size and the shrinkage capacity of the spheres can be tuned by the ratio of NIPAM/styrene (pNIPAM-PS spheres) or NIPAM/BIS (N-N'-methylene-bis-acrylamide) and MA (maleic acid) (pNIPAM-BIS-MA spheres). A ligand-exchange procedure for the transfer of initially organic compatible nanoparticles into aqueous solution using amine-modified or thiol-modified poly(ethylene oxide)s (PEOs) has been carried out prior to their immobilization. We observed that the interaction of the nanoparticles with the pNIPAM-based system depends on the nature of the ligands and the chemical composition of the microspheres. Nanoparticles capped with amine-or mercapto-poly(ethylene oxide) s ligands interact with pNIPAM-PS beads while only amine-capped ones show a clear tendency to interact with pNIPAM containing acid groups which leads to a high nanoparticle coverage. Dynamic light scattering measurements, atomic force microscopy and optical spectroscopy hint that nanoparticles are placed on the surface of pNIPAM-BIS-MA beads while being partially incorporated into pNIPAM-PS network. Cell culture studies demonstrate that the fluorescent composites show non-specific binding to fibroblasts. These features may be very valuable to develop materials for drug delivery and specific targeting of cells combined with the outstanding optical properties of semiconductor nanoparticles as fluorescent labelers.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "Journal of Materials Chemistry",
title = "CdSe/CdS nanoparticles immobilized on pNIPAm-based microspheres",
pages = "1374-1367",
number = "7",
volume = "20",
doi = "10.1039/b917022g"
}

Salcher, A., Nikolić, M., Casado, S., Velez, M., Weller, H.,& Juarez, B. H.. (2010). CdSe/CdS nanoparticles immobilized on pNIPAm-based microspheres. in Journal of Materials Chemistry
Royal Soc Chemistry, Cambridge., 20(7), 1367-1374.
https://doi.org/10.1039/b917022g

Salcher A, Nikolić M, Casado S, Velez M, Weller H, Juarez BH. CdSe/CdS nanoparticles immobilized on pNIPAm-based microspheres. in Journal of Materials Chemistry. 2010;20(7):1367-1374.
doi:10.1039/b917022g .

Salcher, Andrea, Nikolić, Marija, Casado, Santiago, Velez, Marisela, Weller, Horst, Juarez, Beatriz H., "CdSe/CdS nanoparticles immobilized on pNIPAm-based microspheres" in Journal of Materials Chemistry, 20, no. 7 (2010):1367-1374,
https://doi.org/10.1039/b917022g . .

TY  - JOUR
AU  - Bruns, Oliver T.
AU  - Ittrich, Harald
AU  - Peldschus, Kersten
AU  - Kaul, Michael G.
AU  - Tromsdorf, Ulrich I.
AU  - Lauterwasser, Joachim
AU  - Nikolić, Marija
AU  - Mollwitz, Birgit
AU  - Merkell, Martin
AU  - Bigall, Nadja C.
AU  - Sapra, Sameer
AU  - Reimer, Rudolph
AU  - Hohenberg, Heinz
AU  - Weller, Horst
AU  - Eychmueller, Alexander
AU  - Adam, Gerhard
AU  - Beisiegel, Ulrike
AU  - Heeren, Joerg
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1479
AB  - Semiconductor quantum dots and superparamagnetic iron oxide nanocrystals have physical properties that are well suited for biomedical imaging. Previously, we have shown that iron oxide nanocrystals embedded within the lipid core of micelles show optimized characteristics for quantitative imaging. Here, we embed quantum dots and superparamagnetic iron oxide nanocrystals in the core of lipoproteins-micelles that transport lipids and other hydrophobic substances in the blood-and show that it is possible to image and quantify the kinetics of lipoprotein metabolism in vivo using fluorescence and dynamic magnetic resonance imaging. The lipoproteins were taken up by liver cells in wild-type mice and displayed defective clearance in knock-out mice lacking a lipoprotein receptor or its ligand, indicating that the nanocrystals did not influence the specificity of the metabolic process. Using this strategy it is possible to study the clearance of lipoproteins in metabolic disorders and to improve the contrast in clinical imaging.
PB  - Nature Publishing Group, London
T2  - Nature Nanotechnology
T1  - Real-time magnetic resonance imaging and quantification of lipoprotein metabolism in vivo using nanocrystals
EP  - 201
IS  - 3
SP  - 193
VL  - 4
DO  - 10.1038/NNANO.2008.405
ER  - 

@article{
author = "Bruns, Oliver T. and Ittrich, Harald and Peldschus, Kersten and Kaul, Michael G. and Tromsdorf, Ulrich I. and Lauterwasser, Joachim and Nikolić, Marija and Mollwitz, Birgit and Merkell, Martin and Bigall, Nadja C. and Sapra, Sameer and Reimer, Rudolph and Hohenberg, Heinz and Weller, Horst and Eychmueller, Alexander and Adam, Gerhard and Beisiegel, Ulrike and Heeren, Joerg",
year = "2009",
abstract = "Semiconductor quantum dots and superparamagnetic iron oxide nanocrystals have physical properties that are well suited for biomedical imaging. Previously, we have shown that iron oxide nanocrystals embedded within the lipid core of micelles show optimized characteristics for quantitative imaging. Here, we embed quantum dots and superparamagnetic iron oxide nanocrystals in the core of lipoproteins-micelles that transport lipids and other hydrophobic substances in the blood-and show that it is possible to image and quantify the kinetics of lipoprotein metabolism in vivo using fluorescence and dynamic magnetic resonance imaging. The lipoproteins were taken up by liver cells in wild-type mice and displayed defective clearance in knock-out mice lacking a lipoprotein receptor or its ligand, indicating that the nanocrystals did not influence the specificity of the metabolic process. Using this strategy it is possible to study the clearance of lipoproteins in metabolic disorders and to improve the contrast in clinical imaging.",
publisher = "Nature Publishing Group, London",
journal = "Nature Nanotechnology",
title = "Real-time magnetic resonance imaging and quantification of lipoprotein metabolism in vivo using nanocrystals",
pages = "201-193",
number = "3",
volume = "4",
doi = "10.1038/NNANO.2008.405"
}

Bruns, O. T., Ittrich, H., Peldschus, K., Kaul, M. G., Tromsdorf, U. I., Lauterwasser, J., Nikolić, M., Mollwitz, B., Merkell, M., Bigall, N. C., Sapra, S., Reimer, R., Hohenberg, H., Weller, H., Eychmueller, A., Adam, G., Beisiegel, U.,& Heeren, J.. (2009). Real-time magnetic resonance imaging and quantification of lipoprotein metabolism in vivo using nanocrystals. in Nature Nanotechnology
Nature Publishing Group, London., 4(3), 193-201.
https://doi.org/10.1038/NNANO.2008.405

Bruns OT, Ittrich H, Peldschus K, Kaul MG, Tromsdorf UI, Lauterwasser J, Nikolić M, Mollwitz B, Merkell M, Bigall NC, Sapra S, Reimer R, Hohenberg H, Weller H, Eychmueller A, Adam G, Beisiegel U, Heeren J. Real-time magnetic resonance imaging and quantification of lipoprotein metabolism in vivo using nanocrystals. in Nature Nanotechnology. 2009;4(3):193-201.
doi:10.1038/NNANO.2008.405 .

Bruns, Oliver T., Ittrich, Harald, Peldschus, Kersten, Kaul, Michael G., Tromsdorf, Ulrich I., Lauterwasser, Joachim, Nikolić, Marija, Mollwitz, Birgit, Merkell, Martin, Bigall, Nadja C., Sapra, Sameer, Reimer, Rudolph, Hohenberg, Heinz, Weller, Horst, Eychmueller, Alexander, Adam, Gerhard, Beisiegel, Ulrike, Heeren, Joerg, "Real-time magnetic resonance imaging and quantification of lipoprotein metabolism in vivo using nanocrystals" in Nature Nanotechnology, 4, no. 3 (2009):193-201,
https://doi.org/10.1038/NNANO.2008.405 . .

TY  - JOUR
AU  - Nikolić, Marija
AU  - Olsson, Charlotta
AU  - Salcher, Andrea
AU  - Kornowski, Andreas
AU  - Rank, Anja
AU  - Schubert, Rolf
AU  - Froemsdorf, Andreas
AU  - Weller, Horst
AU  - Foerster, Stephan
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1473
PB  - Wiley-VCH Verlag Gmbh, Weinheim
T2  - Angewandte Chemie-International Edition
T1  - Micelle and Vesicle Formation of Amphiphilic Nanoparticles
EP  - 2754
IS  - 15
SP  - 2752
VL  - 48
DO  - 10.1002/anie.200805158
ER  - 

@article{
author = "Nikolić, Marija and Olsson, Charlotta and Salcher, Andrea and Kornowski, Andreas and Rank, Anja and Schubert, Rolf and Froemsdorf, Andreas and Weller, Horst and Foerster, Stephan",
year = "2009",
publisher = "Wiley-VCH Verlag Gmbh, Weinheim",
journal = "Angewandte Chemie-International Edition",
title = "Micelle and Vesicle Formation of Amphiphilic Nanoparticles",
pages = "2754-2752",
number = "15",
volume = "48",
doi = "10.1002/anie.200805158"
}

Nikolić, M., Olsson, C., Salcher, A., Kornowski, A., Rank, A., Schubert, R., Froemsdorf, A., Weller, H.,& Foerster, S.. (2009). Micelle and Vesicle Formation of Amphiphilic Nanoparticles. in Angewandte Chemie-International Edition
Wiley-VCH Verlag Gmbh, Weinheim., 48(15), 2752-2754.
https://doi.org/10.1002/anie.200805158

Nikolić M, Olsson C, Salcher A, Kornowski A, Rank A, Schubert R, Froemsdorf A, Weller H, Foerster S. Micelle and Vesicle Formation of Amphiphilic Nanoparticles. in Angewandte Chemie-International Edition. 2009;48(15):2752-2754.
doi:10.1002/anie.200805158 .

Nikolić, Marija, Olsson, Charlotta, Salcher, Andrea, Kornowski, Andreas, Rank, Anja, Schubert, Rolf, Froemsdorf, Andreas, Weller, Horst, Foerster, Stephan, "Micelle and Vesicle Formation of Amphiphilic Nanoparticles" in Angewandte Chemie-International Edition, 48, no. 15 (2009):2752-2754,
https://doi.org/10.1002/anie.200805158 . .

TY  - JOUR
AU  - Chilla, Gerwin
AU  - Kipp, Tobias
AU  - Menke, Torben
AU  - Heitmann, Detlef
AU  - Nikolić, Marija
AU  - Froemsdorf, Andreas
AU  - Kornowski, Andreas
AU  - Foerster, Stephan
AU  - Weller, Horst
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1253
AB  - We report on the direct observation of confined acoustic phonons in the photoluminescence spectra of single CdSe-CdS-ZnS nanocrystals, whose ligands were exchanged to poly(ethylene oxide) (PEO) before they were embedded in a PEO matrix. Modeling a nanocrystal as an elastic sphere, the confined acoustic modes can be assigned to purely radial vibrations: the breathing mode and its two first radial harmonics. In addition to acoustic modes, we also observe longitudinal optical modes of the core material and, remarkably, also of both shell materials.
PB  - Amer Physical Soc, College Pk
T2  - Physical Review Letters
T1  - Direct observation of confined acoustic phonons in the photoluminescence spectra of a single CdSe-CdS-ZnS core-shell-shell nanocrystal
IS  - 5
VL  - 100
DO  - 10.1103/PhysRevLett.100.057403
ER  - 

@article{
author = "Chilla, Gerwin and Kipp, Tobias and Menke, Torben and Heitmann, Detlef and Nikolić, Marija and Froemsdorf, Andreas and Kornowski, Andreas and Foerster, Stephan and Weller, Horst",
year = "2008",
abstract = "We report on the direct observation of confined acoustic phonons in the photoluminescence spectra of single CdSe-CdS-ZnS nanocrystals, whose ligands were exchanged to poly(ethylene oxide) (PEO) before they were embedded in a PEO matrix. Modeling a nanocrystal as an elastic sphere, the confined acoustic modes can be assigned to purely radial vibrations: the breathing mode and its two first radial harmonics. In addition to acoustic modes, we also observe longitudinal optical modes of the core material and, remarkably, also of both shell materials.",
publisher = "Amer Physical Soc, College Pk",
journal = "Physical Review Letters",
title = "Direct observation of confined acoustic phonons in the photoluminescence spectra of a single CdSe-CdS-ZnS core-shell-shell nanocrystal",
number = "5",
volume = "100",
doi = "10.1103/PhysRevLett.100.057403"
}

Chilla, G., Kipp, T., Menke, T., Heitmann, D., Nikolić, M., Froemsdorf, A., Kornowski, A., Foerster, S.,& Weller, H.. (2008). Direct observation of confined acoustic phonons in the photoluminescence spectra of a single CdSe-CdS-ZnS core-shell-shell nanocrystal. in Physical Review Letters
Amer Physical Soc, College Pk., 100(5).
https://doi.org/10.1103/PhysRevLett.100.057403

Chilla G, Kipp T, Menke T, Heitmann D, Nikolić M, Froemsdorf A, Kornowski A, Foerster S, Weller H. Direct observation of confined acoustic phonons in the photoluminescence spectra of a single CdSe-CdS-ZnS core-shell-shell nanocrystal. in Physical Review Letters. 2008;100(5).
doi:10.1103/PhysRevLett.100.057403 .

Chilla, Gerwin, Kipp, Tobias, Menke, Torben, Heitmann, Detlef, Nikolić, Marija, Froemsdorf, Andreas, Kornowski, Andreas, Foerster, Stephan, Weller, Horst, "Direct observation of confined acoustic phonons in the photoluminescence spectra of a single CdSe-CdS-ZnS core-shell-shell nanocrystal" in Physical Review Letters, 100, no. 5 (2008),
https://doi.org/10.1103/PhysRevLett.100.057403 . .

TY  - JOUR
AU  - Tromsdorf, Ulrich I.
AU  - Bigall, Nadja C.
AU  - Kaul, Michael G.
AU  - Bruns, Oliver T.
AU  - Nikolić, Marija
AU  - Mollwitz, Birgit
AU  - Sperling, Ralph A.
AU  - Reimer, Rudolph
AU  - Hohenberg, Heinz
AU  - Parak, Wolfgang J.
AU  - Forster, Stephan
AU  - Beisiegel, Ulrike
AU  - Adam, Gerhard
AU  - Weller, Horst
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1165
AB  - Superparamagnetic MnFe2O4 nanocrystals of different sizes were synthesized in high-boiling ether solvent and transferred into water using three different approaches. First, we applied a ligand exchange in order to form a water soluble polymer shell. Second, the particles were embedded into an amphiphilic polymer shell. Third, the nanoparticles were embedded into large micelles formed by lipids. Although all approaches lead to effective negative contrast enhancement, we observed significant differences concerning the magnitude of this effect. The transverse relaxivity, in particular r(2)*, is greatly higher for the micellar system compared to the polymer-coated particles using same-sized nanoparticles. We also observed an increase in transverse relaxivities with increasing particle size for the polymer-coated nanocrystals. The results are qualitatively compared with theoretical models describing the dependence of relaxivity on the size of magnetic spheres.
PB  - Amer Chemical Soc, Washington
T2  - Nano Letters
T1  - Size and surface effects on the MRI relaxivity of manganese ferrite nanoparticle contrast agents
EP  - 2427
IS  - 8
SP  - 2422
VL  - 7
DO  - 10.1021/nl071099b
ER  - 

@article{
author = "Tromsdorf, Ulrich I. and Bigall, Nadja C. and Kaul, Michael G. and Bruns, Oliver T. and Nikolić, Marija and Mollwitz, Birgit and Sperling, Ralph A. and Reimer, Rudolph and Hohenberg, Heinz and Parak, Wolfgang J. and Forster, Stephan and Beisiegel, Ulrike and Adam, Gerhard and Weller, Horst",
year = "2007",
abstract = "Superparamagnetic MnFe2O4 nanocrystals of different sizes were synthesized in high-boiling ether solvent and transferred into water using three different approaches. First, we applied a ligand exchange in order to form a water soluble polymer shell. Second, the particles were embedded into an amphiphilic polymer shell. Third, the nanoparticles were embedded into large micelles formed by lipids. Although all approaches lead to effective negative contrast enhancement, we observed significant differences concerning the magnitude of this effect. The transverse relaxivity, in particular r(2)*, is greatly higher for the micellar system compared to the polymer-coated particles using same-sized nanoparticles. We also observed an increase in transverse relaxivities with increasing particle size for the polymer-coated nanocrystals. The results are qualitatively compared with theoretical models describing the dependence of relaxivity on the size of magnetic spheres.",
publisher = "Amer Chemical Soc, Washington",
journal = "Nano Letters",
title = "Size and surface effects on the MRI relaxivity of manganese ferrite nanoparticle contrast agents",
pages = "2427-2422",
number = "8",
volume = "7",
doi = "10.1021/nl071099b"
}

Tromsdorf, U. I., Bigall, N. C., Kaul, M. G., Bruns, O. T., Nikolić, M., Mollwitz, B., Sperling, R. A., Reimer, R., Hohenberg, H., Parak, W. J., Forster, S., Beisiegel, U., Adam, G.,& Weller, H.. (2007). Size and surface effects on the MRI relaxivity of manganese ferrite nanoparticle contrast agents. in Nano Letters
Amer Chemical Soc, Washington., 7(8), 2422-2427.
https://doi.org/10.1021/nl071099b

Tromsdorf UI, Bigall NC, Kaul MG, Bruns OT, Nikolić M, Mollwitz B, Sperling RA, Reimer R, Hohenberg H, Parak WJ, Forster S, Beisiegel U, Adam G, Weller H. Size and surface effects on the MRI relaxivity of manganese ferrite nanoparticle contrast agents. in Nano Letters. 2007;7(8):2422-2427.
doi:10.1021/nl071099b .

Tromsdorf, Ulrich I., Bigall, Nadja C., Kaul, Michael G., Bruns, Oliver T., Nikolić, Marija, Mollwitz, Birgit, Sperling, Ralph A., Reimer, Rudolph, Hohenberg, Heinz, Parak, Wolfgang J., Forster, Stephan, Beisiegel, Ulrike, Adam, Gerhard, Weller, Horst, "Size and surface effects on the MRI relaxivity of manganese ferrite nanoparticle contrast agents" in Nano Letters, 7, no. 8 (2007):2422-2427,
https://doi.org/10.1021/nl071099b . .

TY  - JOUR
AU  - Nikolić, Marija
AU  - Krack, Maren
AU  - Aleksandrović, Vesna
AU  - Kornowski, Andreas
AU  - Foerster, Stephan
AU  - Weller, Horst
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/907
PB  - Wiley-VCH Verlag Gmbh, Weinheim
T2  - Angewandte Chemie-International Edition
T1  - Tailor-made ligands for biocompatible nanoparticles
EP  - 6580
IS  - 39
SP  - 6577
VL  - 45
DO  - 10.1002/anie.200602209
ER  - 

@article{
author = "Nikolić, Marija and Krack, Maren and Aleksandrović, Vesna and Kornowski, Andreas and Foerster, Stephan and Weller, Horst",
year = "2006",
publisher = "Wiley-VCH Verlag Gmbh, Weinheim",
journal = "Angewandte Chemie-International Edition",
title = "Tailor-made ligands for biocompatible nanoparticles",
pages = "6580-6577",
number = "39",
volume = "45",
doi = "10.1002/anie.200602209"
}

Nikolić, M., Krack, M., Aleksandrović, V., Kornowski, A., Foerster, S.,& Weller, H.. (2006). Tailor-made ligands for biocompatible nanoparticles. in Angewandte Chemie-International Edition
Wiley-VCH Verlag Gmbh, Weinheim., 45(39), 6577-6580.
https://doi.org/10.1002/anie.200602209

Nikolić M, Krack M, Aleksandrović V, Kornowski A, Foerster S, Weller H. Tailor-made ligands for biocompatible nanoparticles. in Angewandte Chemie-International Edition. 2006;45(39):6577-6580.
doi:10.1002/anie.200602209 .

Nikolić, Marija, Krack, Maren, Aleksandrović, Vesna, Kornowski, Andreas, Foerster, Stephan, Weller, Horst, "Tailor-made ligands for biocompatible nanoparticles" in Angewandte Chemie-International Edition, 45, no. 39 (2006):6577-6580,
https://doi.org/10.1002/anie.200602209 . .

TY  - JOUR
AU  - Katsikas, Lynne
AU  - Veličković, Jovan S.
AU  - Weller, Horst
AU  - Popović, Ivanka
PY  - 1997
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/123
AB  - The thermal stability of poly(methyl methacrylate) (PMMA) photopolymerised using colloidal cadmium sulphide as the photoinitiator was studied by thermogravimetry (TG) and differential TG (DTG). The thermal stability of the CdS initiated PMMA was greater than that of conventional radically polymerised PMMA and approached that of anionically prepared PMMA. The DTG curve of the CdS initiated PMMA was a composite of four peaks, three of which correspond to the three peaks observed in the DTG curve of standard radically prepared PMMB. It is suggested that the additional peak arises from a new mode of depolymerisation initiation, that is, from chain end unsaturation introduced into the polymer chain during polymerisation initiation with the colloidal CdS.
PB  - Springer, Dordrecht
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Thermogravimetric characterisation of poly(methyl methacrylate) photopolymerised by colloidal cadmium sulphide
EP  - 323
IS  - 1
SP  - 317
VL  - 49
DO  - 10.1007/BF01987453
ER  - 

@article{
author = "Katsikas, Lynne and Veličković, Jovan S. and Weller, Horst and Popović, Ivanka",
year = "1997",
abstract = "The thermal stability of poly(methyl methacrylate) (PMMA) photopolymerised using colloidal cadmium sulphide as the photoinitiator was studied by thermogravimetry (TG) and differential TG (DTG). The thermal stability of the CdS initiated PMMA was greater than that of conventional radically polymerised PMMA and approached that of anionically prepared PMMA. The DTG curve of the CdS initiated PMMA was a composite of four peaks, three of which correspond to the three peaks observed in the DTG curve of standard radically prepared PMMB. It is suggested that the additional peak arises from a new mode of depolymerisation initiation, that is, from chain end unsaturation introduced into the polymer chain during polymerisation initiation with the colloidal CdS.",
publisher = "Springer, Dordrecht",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Thermogravimetric characterisation of poly(methyl methacrylate) photopolymerised by colloidal cadmium sulphide",
pages = "323-317",
number = "1",
volume = "49",
doi = "10.1007/BF01987453"
}

Katsikas, L., Veličković, J. S., Weller, H.,& Popović, I.. (1997). Thermogravimetric characterisation of poly(methyl methacrylate) photopolymerised by colloidal cadmium sulphide. in Journal of Thermal Analysis and Calorimetry
Springer, Dordrecht., 49(1), 317-323.
https://doi.org/10.1007/BF01987453

Katsikas L, Veličković JS, Weller H, Popović I. Thermogravimetric characterisation of poly(methyl methacrylate) photopolymerised by colloidal cadmium sulphide. in Journal of Thermal Analysis and Calorimetry. 1997;49(1):317-323.
doi:10.1007/BF01987453 .

Katsikas, Lynne, Veličković, Jovan S., Weller, Horst, Popović, Ivanka, "Thermogravimetric characterisation of poly(methyl methacrylate) photopolymerised by colloidal cadmium sulphide" in Journal of Thermal Analysis and Calorimetry, 49, no. 1 (1997):317-323,
https://doi.org/10.1007/BF01987453 . .

TY  - JOUR
AU  - Vossmeyer, Tobias
AU  - Katsikas, Lynne
AU  - Giersig, M.
AU  - Popović, Ivanka
AU  - Diesner, K.
AU  - Chemseddine, A.
AU  - Eychmüller, A.
AU  - Weller, Horst
PY  - 1994
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/56
AB  - Improved synthetic routes and size-selective precipitation have enabled the preparation of almost monodisperse CdS clusters. Six samples of 1-thioglycerol stabilized clusters with diameters of approximately 13, 14, 16, 19, 23, and 39 Å have been prepared as fully redispersible powders and were characterized by elemental analysis, powder X-ray diffraction, electron microscopy, thermogravimetric analysis, and UV-vis spectroscopy. Small-angle X-ray scattering was used to determine the mean cluster size. The well-structured UV-vis spectra reveal that the size-dependent shift of the 1s-1s excitonic transition is in agreement with the tight-binding theory and the pseudopotential theory. Moreover, as expected by quantum mechanical calculations the oscillator strength of the transition increases proportional to 1/r3. UV-vis spectra taken at various temperatures between 4 and 295 K have shown that the temperature shift of the excitonic transition energy becomes stronger with decreasing particle size. Strong, reversible absorbance shifts were observed, upon transferring the clusters from their solutions onto quartz plates and vice versa.
T2  - Journal of Physical Chemistry
T1  - CdS nanoclusters: Synthesis, characterization, size dependent oscillator strength, temperature shift of the excitonic transition energy, and reversible absorbance shift
EP  - 7673
IS  - 31
SP  - 7665
VL  - 98
DO  - 10.1021/j100082a044
ER  - 

@article{
author = "Vossmeyer, Tobias and Katsikas, Lynne and Giersig, M. and Popović, Ivanka and Diesner, K. and Chemseddine, A. and Eychmüller, A. and Weller, Horst",
year = "1994",
abstract = "Improved synthetic routes and size-selective precipitation have enabled the preparation of almost monodisperse CdS clusters. Six samples of 1-thioglycerol stabilized clusters with diameters of approximately 13, 14, 16, 19, 23, and 39 Å have been prepared as fully redispersible powders and were characterized by elemental analysis, powder X-ray diffraction, electron microscopy, thermogravimetric analysis, and UV-vis spectroscopy. Small-angle X-ray scattering was used to determine the mean cluster size. The well-structured UV-vis spectra reveal that the size-dependent shift of the 1s-1s excitonic transition is in agreement with the tight-binding theory and the pseudopotential theory. Moreover, as expected by quantum mechanical calculations the oscillator strength of the transition increases proportional to 1/r3. UV-vis spectra taken at various temperatures between 4 and 295 K have shown that the temperature shift of the excitonic transition energy becomes stronger with decreasing particle size. Strong, reversible absorbance shifts were observed, upon transferring the clusters from their solutions onto quartz plates and vice versa.",
journal = "Journal of Physical Chemistry",
title = "CdS nanoclusters: Synthesis, characterization, size dependent oscillator strength, temperature shift of the excitonic transition energy, and reversible absorbance shift",
pages = "7673-7665",
number = "31",
volume = "98",
doi = "10.1021/j100082a044"
}

Vossmeyer, T., Katsikas, L., Giersig, M., Popović, I., Diesner, K., Chemseddine, A., Eychmüller, A.,& Weller, H.. (1994). CdS nanoclusters: Synthesis, characterization, size dependent oscillator strength, temperature shift of the excitonic transition energy, and reversible absorbance shift. in Journal of Physical Chemistry, 98(31), 7665-7673.
https://doi.org/10.1021/j100082a044

Vossmeyer T, Katsikas L, Giersig M, Popović I, Diesner K, Chemseddine A, Eychmüller A, Weller H. CdS nanoclusters: Synthesis, characterization, size dependent oscillator strength, temperature shift of the excitonic transition energy, and reversible absorbance shift. in Journal of Physical Chemistry. 1994;98(31):7665-7673.
doi:10.1021/j100082a044 .

Vossmeyer, Tobias, Katsikas, Lynne, Giersig, M., Popović, Ivanka, Diesner, K., Chemseddine, A., Eychmüller, A., Weller, Horst, "CdS nanoclusters: Synthesis, characterization, size dependent oscillator strength, temperature shift of the excitonic transition energy, and reversible absorbance shift" in Journal of Physical Chemistry, 98, no. 31 (1994):7665-7673,
https://doi.org/10.1021/j100082a044 . .

TY  - JOUR
AU  - Popović, Ivanka
AU  - Katsikas, Lynne
AU  - Weller, Horst
PY  - 1994
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/57
AB  - Methacrylic acid was photopolymerised using CdS and composite, CdS/HgS and CdS/TiO2, colloidal semiconductor particles as initiators. The previously proposed photoinitiation mechanism involving the photogenerated positive hole in the valence band of the CdS colloid was confirmed by the electron scavenging action of TiO2. The effect of pH on the course of the polymerisation was investigated and is discussed.
PB  - Springer, New York
T2  - Polymer Bulletin
T1  - The photopolymerisation of methacrylic acid by colloidal semiconductors
EP  - 603
IS  - 5-6
SP  - 597
VL  - 32
DO  - 10.1007/BF00973907
ER  - 

@article{
author = "Popović, Ivanka and Katsikas, Lynne and Weller, Horst",
year = "1994",
abstract = "Methacrylic acid was photopolymerised using CdS and composite, CdS/HgS and CdS/TiO2, colloidal semiconductor particles as initiators. The previously proposed photoinitiation mechanism involving the photogenerated positive hole in the valence band of the CdS colloid was confirmed by the electron scavenging action of TiO2. The effect of pH on the course of the polymerisation was investigated and is discussed.",
publisher = "Springer, New York",
journal = "Polymer Bulletin",
title = "The photopolymerisation of methacrylic acid by colloidal semiconductors",
pages = "603-597",
number = "5-6",
volume = "32",
doi = "10.1007/BF00973907"
}

Popović, I., Katsikas, L.,& Weller, H.. (1994). The photopolymerisation of methacrylic acid by colloidal semiconductors. in Polymer Bulletin
Springer, New York., 32(5-6), 597-603.
https://doi.org/10.1007/BF00973907

Popović I, Katsikas L, Weller H. The photopolymerisation of methacrylic acid by colloidal semiconductors. in Polymer Bulletin. 1994;32(5-6):597-603.
doi:10.1007/BF00973907 .

Popović, Ivanka, Katsikas, Lynne, Weller, Horst, "The photopolymerisation of methacrylic acid by colloidal semiconductors" in Polymer Bulletin, 32, no. 5-6 (1994):597-603,
https://doi.org/10.1007/BF00973907 . .

TY  - JOUR
AU  - Popović, Ivanka
AU  - Katsikas, Lynne
AU  - Müller, U.
AU  - Veličković, Jovan S.
AU  - Weller, Horst
PY  - 1994
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/58
AB  - A completely new method of initiating the homogeneous radical polymerization of methyl methacrylate in bulk or in solution via the photogeneration of an electron hole pair in colloidal cadmium sulfide is presented. A polymerization mechanism involving an excited cadmium sulfide particle in both the initiation and termination steps is proposed. In the initiation a methyl methacrylate molecule is oxidized by a positive hole photogenerated in a CdS particle, which results in a novel chain‐end structure of the poly(methyl methacrylate) (PMMA). Degradative chain transfer to reduced excited cadmium sulfide particles is responsible for chain termination. Thus, for the first time, a detailed polymerization mechanism in which all states of the polymerization, i.e., initiation, propagation, chain transfer and termination, is presented for the polymerization of vinyl monomers initiated by semiconductors. Thermogravimetry (TG) showed that the newly synthesized PMMA has greatly enhanced thermal stability when compared to normal radically prepared PMMA. In fact, the thermal stability approaches that of anionically prepared PMMA but is experimentally much easier to prepare. This technique enables the homogeneous embedding of CdS particles in a polymer matrix.
PB  - Wiley-VCH Verlag Gmbh, Weinheim
T2  - Macromolecular Chemistry and Physics
T1  - The homogeneous photopolymerization of methyl methacrylate by colloidal cadmium sulfide
EP  - 904
IS  - 3
SP  - 889
VL  - 195
DO  - 10.1002/macp.1994.021950307
ER  - 

@article{
author = "Popović, Ivanka and Katsikas, Lynne and Müller, U. and Veličković, Jovan S. and Weller, Horst",
year = "1994",
abstract = "A completely new method of initiating the homogeneous radical polymerization of methyl methacrylate in bulk or in solution via the photogeneration of an electron hole pair in colloidal cadmium sulfide is presented. A polymerization mechanism involving an excited cadmium sulfide particle in both the initiation and termination steps is proposed. In the initiation a methyl methacrylate molecule is oxidized by a positive hole photogenerated in a CdS particle, which results in a novel chain‐end structure of the poly(methyl methacrylate) (PMMA). Degradative chain transfer to reduced excited cadmium sulfide particles is responsible for chain termination. Thus, for the first time, a detailed polymerization mechanism in which all states of the polymerization, i.e., initiation, propagation, chain transfer and termination, is presented for the polymerization of vinyl monomers initiated by semiconductors. Thermogravimetry (TG) showed that the newly synthesized PMMA has greatly enhanced thermal stability when compared to normal radically prepared PMMA. In fact, the thermal stability approaches that of anionically prepared PMMA but is experimentally much easier to prepare. This technique enables the homogeneous embedding of CdS particles in a polymer matrix.",
publisher = "Wiley-VCH Verlag Gmbh, Weinheim",
journal = "Macromolecular Chemistry and Physics",
title = "The homogeneous photopolymerization of methyl methacrylate by colloidal cadmium sulfide",
pages = "904-889",
number = "3",
volume = "195",
doi = "10.1002/macp.1994.021950307"
}

Popović, I., Katsikas, L., Müller, U., Veličković, J. S.,& Weller, H.. (1994). The homogeneous photopolymerization of methyl methacrylate by colloidal cadmium sulfide. in Macromolecular Chemistry and Physics
Wiley-VCH Verlag Gmbh, Weinheim., 195(3), 889-904.
https://doi.org/10.1002/macp.1994.021950307

Popović I, Katsikas L, Müller U, Veličković JS, Weller H. The homogeneous photopolymerization of methyl methacrylate by colloidal cadmium sulfide. in Macromolecular Chemistry and Physics. 1994;195(3):889-904.
doi:10.1002/macp.1994.021950307 .

Popović, Ivanka, Katsikas, Lynne, Müller, U., Veličković, Jovan S., Weller, Horst, "The homogeneous photopolymerization of methyl methacrylate by colloidal cadmium sulfide" in Macromolecular Chemistry and Physics, 195, no. 3 (1994):889-904,
https://doi.org/10.1002/macp.1994.021950307 . .

TY  - JOUR
AU  - Popović, Ivanka
AU  - Katsikas, Lynne
AU  - Weller, Horst
AU  - Schrötter, S.
AU  - Veličković, Jovan S.
PY  - 1993
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/46
AB  - The application of differential thermogravimetric analysis (DTGA) to the study of polymerization mechanisms is illustrated using as examples the radical polymerization of di‐n‐alkyl itaconates and methyl methacrylate (MMA). Five poly(di‐n‐alkyl itaconates) were prepared in bulk, both in the presence and absence of n‐dodecyl mercaptan and in solution using AIBN as initiator. The poly(methyl methacrylate) (PMMA) was photoinitiated using colloidal CdS as a photosensitizer. The thermal properties of the resulting polymers are described in terms of the proposed polymerization mechanisms. The advantages and disadvantages of DTGA for the identification of thermally weak structures are discussed.
PB  - Wiley, Hoboken
T2  - Journal of Applied Polymer Science
T1  - Polymerization studies: The application of differential thermogravimetric analysis
EP  - 1482
IS  - 8
SP  - 1475
VL  - 50
DO  - 10.1002/app.1993.070500819
ER  - 

@article{
author = "Popović, Ivanka and Katsikas, Lynne and Weller, Horst and Schrötter, S. and Veličković, Jovan S.",
year = "1993",
abstract = "The application of differential thermogravimetric analysis (DTGA) to the study of polymerization mechanisms is illustrated using as examples the radical polymerization of di‐n‐alkyl itaconates and methyl methacrylate (MMA). Five poly(di‐n‐alkyl itaconates) were prepared in bulk, both in the presence and absence of n‐dodecyl mercaptan and in solution using AIBN as initiator. The poly(methyl methacrylate) (PMMA) was photoinitiated using colloidal CdS as a photosensitizer. The thermal properties of the resulting polymers are described in terms of the proposed polymerization mechanisms. The advantages and disadvantages of DTGA for the identification of thermally weak structures are discussed.",
publisher = "Wiley, Hoboken",
journal = "Journal of Applied Polymer Science",
title = "Polymerization studies: The application of differential thermogravimetric analysis",
pages = "1482-1475",
number = "8",
volume = "50",
doi = "10.1002/app.1993.070500819"
}

Popović, I., Katsikas, L., Weller, H., Schrötter, S.,& Veličković, J. S.. (1993). Polymerization studies: The application of differential thermogravimetric analysis. in Journal of Applied Polymer Science
Wiley, Hoboken., 50(8), 1475-1482.
https://doi.org/10.1002/app.1993.070500819

Popović I, Katsikas L, Weller H, Schrötter S, Veličković JS. Polymerization studies: The application of differential thermogravimetric analysis. in Journal of Applied Polymer Science. 1993;50(8):1475-1482.
doi:10.1002/app.1993.070500819 .

Popović, Ivanka, Katsikas, Lynne, Weller, Horst, Schrötter, S., Veličković, Jovan S., "Polymerization studies: The application of differential thermogravimetric analysis" in Journal of Applied Polymer Science, 50, no. 8 (1993):1475-1482,
https://doi.org/10.1002/app.1993.070500819 . .

TY  - JOUR
AU  - Popović, Ivanka
AU  - Katsikas, Lynne
AU  - Prazić, A.
AU  - Schrötter, S.
AU  - Weller, Horst
AU  - Veličković, Jovan S.
PY  - 1993
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/49
AB  - The application of derivativ thermogravimetry (DTG) to investigate polymerisation mechanisms is illustrated using the radical polymerisation of di-n-alkyl itaconates as well as the photoinitiated polymerisation of methyl methacrylate by colloidal CdS. The thermal properties of the resulting polymers are described. The advantages and disadvantages of DTG are discussed.
PB  - John Wiley & Sons Ltd, W Sussex
T2  - Journal of Thermal Analysis
T1  - The applicability of DTG to polymerisation studies
EP  - 765
IS  - 2
SP  - 757
VL  - 40
DO  - 10.1007/BF02546649
ER  - 

@article{
author = "Popović, Ivanka and Katsikas, Lynne and Prazić, A. and Schrötter, S. and Weller, Horst and Veličković, Jovan S.",
year = "1993",
abstract = "The application of derivativ thermogravimetry (DTG) to investigate polymerisation mechanisms is illustrated using the radical polymerisation of di-n-alkyl itaconates as well as the photoinitiated polymerisation of methyl methacrylate by colloidal CdS. The thermal properties of the resulting polymers are described. The advantages and disadvantages of DTG are discussed.",
publisher = "John Wiley & Sons Ltd, W Sussex",
journal = "Journal of Thermal Analysis",
title = "The applicability of DTG to polymerisation studies",
pages = "765-757",
number = "2",
volume = "40",
doi = "10.1007/BF02546649"
}

Popović, I., Katsikas, L., Prazić, A., Schrötter, S., Weller, H.,& Veličković, J. S.. (1993). The applicability of DTG to polymerisation studies. in Journal of Thermal Analysis
John Wiley & Sons Ltd, W Sussex., 40(2), 757-765.
https://doi.org/10.1007/BF02546649

Popović I, Katsikas L, Prazić A, Schrötter S, Weller H, Veličković JS. The applicability of DTG to polymerisation studies. in Journal of Thermal Analysis. 1993;40(2):757-765.
doi:10.1007/BF02546649 .

Popović, Ivanka, Katsikas, Lynne, Prazić, A., Schrötter, S., Weller, Horst, Veličković, Jovan S., "The applicability of DTG to polymerisation studies" in Journal of Thermal Analysis, 40, no. 2 (1993):757-765,
https://doi.org/10.1007/BF02546649 . .