TY  - GEN
A1  - Tao, Lumi
A1  - Liu, Yuchuan
A1  - Wu, Dan
A1  - Wei, Qiao-Hua
A1  - Taubert, Andreas
A1  - Xie, Zailai
T1  - Luminescent Ionogels with Excellent Transparency, High Mechanical Strength, and High Conductivity
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - The paper describes a new kind of ionogel with both good mechanical strength and high conductivity synthesized by confining the ionic liquid (IL) 1-butyl-3-methylimidazolium bis(trifluoromethane sulfonyl)imide ([Bmim][NTf₂]) within an organic–inorganic hybrid host. The organic–inorganic host network was synthesized by the reaction of methyltrimethoxysilane (MTMS), tetraethoxysilane (TEOS), and methyl methacrylate (MMA) in the presence of a coupling agent, offering the good mechanical strength and rapid shape recovery of the final products. The silane coupling agent 3-methacryloxypropyltrimethoxysilane (KH-570) plays an important role in improving the mechanical strength of the inorganic–organic hybrid, because it covalently connected the organic component MMA and the inorganic component SiO₂. Both the thermal stability and mechanical strength of the ionogel significantly increased by the addition of IL. The immobilization of [Bmim][NTf₂] within the ionogel provided the final ionogel with an ionic conductivity as high as ca. 0.04 S cm⁻¹ at 50 °C. Moreover, the hybrid ionogel can be modified with organosilica-modified carbon dots within the network to yield a transparent and flexible ionogel with strong excitation-dependent emission between 400 and 800 nm. The approach is, therefore, a blueprint for the construction of next-generation multifunctional ionogels.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1058 
KW  - ionic liquid
KW  - ionogel
KW  - carbon dots
KW  - organic–inorganic hybrid
KW  - luminescence
KW  - mechanical strength
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-487334
SN  - 1866-8372
IS  - 1058
ER  - 
TY  - JOUR
A1  - Si, Satyabrata
A1  - Taubert, Andreas
A1  - Mantion, Alexandre
A1  - Rogez, Guillaume
A1  - Rabu, Pierre
T1  - Peptide-intercalated layered metal hydroxides effect of peptide chain length and side chain functionality on structural, optical and magnetic properties
JF  - Chemical science
N2  - New hybrid materials have been prepared by grafting synthetic peptides in the interlayer spacing of Cu(II) and Co(II) layered simple hydroxides (LSHs). The interlayer spacing of the hybrids depends on the peptide chain length; the dependence is specific for the copper and cobalt-based hybrids. This suggests a metal-or LSH-specific interaction of the peptides with the respective inorganic layers. When tyrosine is present in the peptide, its fluorescence is quenched after grafting the peptide to the LSH. Studies of the luminescence vs. pH indicate deprotonation of the tyrosine moieties to tyrosinate at high pH, accompanied by the onset of luminescence. The luminescence increases with increasing OH- concentration, suggesting an application of the hybrids as chemical sensors. Moreover, the peptides influence the magnetic properties of the hybrids. The copper-based hybrids behave antiferromagnetically and the cobalt-based hybrids are ferrimagnets.
Y1  - 2012
U6  - https://doi.org/10.1039/c2sc01087a
SN  - 2041-6520
VL  - 3
IS  - 6
SP  - 1945
EP  - 1957
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - JOUR
A1  - Shkilnyy, Andriy
A1  - Schöne, Stefanie
A1  - Rumplasch, Claudia
A1  - Uhlmann, Annett
A1  - Hedderich, Annett
A1  - Günter, Christina
A1  - Taubert, Andreas
T1  - Calcium phosphate mineralization with linear poly(ethylene imine) a time-resolved study
JF  - Colloid and polymer science : official journal of the Kolloid-Gesellschaft
N2  - We have earlier shown that linear poly(ethylene imine) (LPEI) is an efficient growth modifier for calcium phosphate mineralization from aqueous solution (Shkilnyy et al., Langmuir, 2008, 24 (5), 2102). The current study addresses the growth process and the reason why LPEI is such an effective additive. To that end, the solution pH and the calcium and phosphate concentrations were monitored vs. reaction time using potentiometric, complexometric, and photometric methods. The phase transformations in the precipitates and particle morphogenesis were analyzed by X-ray diffraction and transmission electron microscopy, respectively. All measurements reveal steep decreases of the pH, calcium, and phosphate concentrations along with a rapid precipitation of brushite nanoparticles early on in the reaction. Brushite transforms into hydroxyapatite (HAP) within the first 2 h, which is much faster than what is reported, for example, for calcium phosphate precipitated with poly(acrylic acid). We propose that poly(ethylene imine) acts as a proton acceptor (weak buffer), which accelerates the transformation from brushite to HAP by taking up the protons that are released from the calcium phosphate precipitate during the phase transformation.
KW  - Calcium phosphate
KW  - Polyethylene imine
KW  - Mineralization
KW  - Kinetics
Y1  - 2011
U6  - https://doi.org/10.1007/s00396-011-2403-2
SN  - 0303-402X
VL  - 289
IS  - 8
SP  - 881
EP  - 888
PB  - Springer
CY  - New York
ER  - 
TY  - JOUR
A1  - Shkilnyy, Andriy
A1  - Gräf, Ralph
A1  - Hiebl, Bernhard
A1  - Neffe, Axel T.
A1  - Friedrich, Alwin
A1  - Hartmann, Juergen
A1  - Taubert, Andreas
T1  - Unprecedented, low cytotoxicity of spongelike calcium phosphate/poly(ethylene imine) hydrogel composites
N2  - Covalently crosslinked PEI hydrogels are efficient templates for calcium phosphate mineralization in SBF. In contrast to the PEI hydrogels, non-crosslinked PEI does not lead to calcium phosphate nucleation and growth in SBF. The precipitate is a mixture of brushite and hydroxyapatite. The PEI/calcium phosphate composite material exhibits a sponge like morphology and a chemical composition that is interesting for implants. Cytotoxicity tests using Dictyostelium discoideum amoebae show that both the non-mineralized and mineralized hydrogels have a very low cytotoxicity. This suggests that next generation PEI hydrogels, where also the degradation products are non-toxic, could be interesting for biomedical applications.
Y1  - 2009
UR  - http://www3.interscience.wiley.com/cgi-bin/jhome/77002860
U6  - https://doi.org/10.1002/mabi.200800266
SN  - 1616-5187
ER  - 
TY  - JOUR
A1  - Shkilnyy, Andriy
A1  - Brandt, Jessica
A1  - Mantion, Alexandre
A1  - Paris, Oskar
A1  - Schlaad, Helmut
A1  - Taubert, Andreas
T1  - Calcium phosphate with a channel-like morphology by polymer templating
N2  - Calcium phosphate mineralization from aqueous solution in the presence of organic growth modifiers has been intensely studied in the recent past. This is mostly due to potential applications of the resulting composites in the biomaterials field. Polymers in particular are efficient growth modifiers. As a result, there has been a large amount of work on polymeric growth modifiers. Interestingly, however, relatively little work has been done on polycationic additives. The current paper shows that poly(ethylene oxide)b-poly(L-lysine) block copolymers lead to an interesting morphology of calcium phosphate precipitated at room temperature and subjected to a mild heat treatment at 85 degrees C. Electron microscopy, synchrotron X-ray diffraction, and porosity analysis show that a (somewhat) porous material with channel-like features forms. Closer inspection using transmission electron microscopy shows that the channels are probably not real channels. Much rather the morphology is the result of the aggregation of ca. 100-nm-sized rodlike primary particles, which changes upon drying to exhibit the observed channel-like features. Comparison experiments conducted in the absence of polymer and with poly(ethylene oxide)-b-poly(L-glutamate) show that these features only form in the presence of the polycationic poly(L-lysine) block, suggesting a distinct interaction of the polycation with either the crystal or the phosphate ions prior to mineralization.
Y1  - 2009
UR  - http://pubs.acs.org/journal/cmatex
U6  - https://doi.org/10.1021/Cm803244z
SN  - 0897-4756
ER  - 
TY  - JOUR
A1  - Schweizer, S.
A1  - Schuster, T.
A1  - Junginger, Matthias
A1  - Siekmeyer, Gerd
A1  - Taubert, Andreas
T1  - Surface modification of ickel/Titanium Alloy and Titanium Surfaces via a Polyelectrolyte Multilayer/Calcium Phosphate Hybrid Coating
N2  - The report shows that simple LbL deposition of positively charged chitosan and negatively charged heparin can be used to efficiently modify the native surface of both NiTi and Ti without any previous treatments. Moreover, mineralization of the polymer multilayers with calcium phosphate leads to surfaces with low contact angles around 70 and 20 degrees for NiTi and Ti, respectively. This suggests that a polymer multilayer/calcium phosphate hybrid coating could be useful for making NiTi or Ti implants that are at the same time antibacterial (via the chitosan), suppress blood clot formation (via the heparin), and favor fast endothelialization (via the improved surface hydrophilicity compared to the respective neat material).
Y1  - 2010
UR  - http://onlinelibrary.wiley.com/doi/10.1002/mame.200900347/pdf
U6  - https://doi.org/10.1002/mame.200900347
SN  - 1438-7492
ER  - 
TY  - GEN
A1  - Schneider, Matthias
A1  - Günter, Christina
A1  - Taubert, Andreas
T1  - Co-deposition of a hydrogel/calcium phosphate hybrid layer on 3D printed poly(lactic acid) scaffolds via dip coating
BT  - Towards automated biomaterials fabrication
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - The article describes the surface modification of 3D printed poly(lactic acid) (PLA) scaffolds with calcium phosphate (CP)/gelatin and CP/chitosan hybrid coating layers. The presence of gelatin or chitosan significantly enhances CP co-deposition and adhesion of the mineral layer on the PLA scaffolds. The hydrogel/CP coating layers are fairly thick and the mineral is a mixture of brushite, octacalcium phosphate, and hydroxyapatite. Mineral formation is uniform throughout the printed architectures and all steps (printing, hydrogel deposition, and mineralization) are in principle amenable to automatization. Overall, the process reported here therefore has a high application potential for the controlled synthesis of biomimetic coatings on polymeric biomaterials.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1057 
KW  - 3D printing
KW  - dip-coating
KW  - poly(lactic acid)
KW  - PLA
KW  - calcium phosphate
KW  - gelatin
KW  - chitosan
KW  - hydrogel
KW  - calcium phosphate hybrid material
KW  - biomaterials
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-474427
SN  - 1866-8372
IS  - 1057
ER  - 
TY  - JOUR
A1  - Schneider, Matthias
A1  - Günter, Christina
A1  - Taubert, Andreas
T1  - Co-deposition of a hydrogel/calcium phosphate hybrid layer on 3D printed poly(lactic acid) scaffolds via dip coating
BT  - Towards Automated Biomaterials Fabrication
JF  - Polymers
N2  - The article describes the surface modification of 3D printed poly(lactic acid) (PLA) scaffolds with calcium phosphate (CP)/gelatin and CP/chitosan hybrid coating layers. The presence of gelatin or chitosan significantly enhances CP co-deposition and adhesion of the mineral layer on the PLA scaffolds. The hydrogel/CP coating layers are fairly thick and the mineral is a mixture of brushite, octacalcium phosphate, and hydroxyapatite. Mineral formation is uniform throughout the printed architectures and all steps (printing, hydrogel deposition, and mineralization) are in principle amenable to automatization. Overall, the process reported here therefore has a high application potential for the controlled synthesis of biomimetic coatings on polymeric biomaterials.
KW  - 3D printing
KW  - dip-coating
KW  - poly(lactic acid)
KW  - PLA
KW  - calcium phosphate
KW  - gelatin
KW  - chitosan
KW  - hydrogel
KW  - calcium phosphate hybrid material
KW  - biomaterials
Y1  - 2018
U6  - https://doi.org/10.3390/polym10030275
SN  - 2073-4360
VL  - 10
IS  - 3
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Schneider, Matthias
A1  - Fritzsche, Nora
A1  - Puciul-Malinowska, Agnieszka
A1  - Baliś, Andrzej
A1  - Mostafa, Amr
A1  - Bald, Ilko
A1  - Zapotoczny, Szczepan
A1  - Taubert, Andreas
T1  - Surface etching of 3D printed poly(lactic acid) with NaOH
BT  - a systematic approach
JF  - Polymers
N2  - The article describes a systematic investigation of the effects of an aqueous NaOH treatment of 3D printed poly(lactic acid) (PLA) scaffolds for surface activation. The PLA surface undergoes several morphology changes and after an initial surface roughening, the surface becomes smoother again before the material dissolves. Erosion rates and surface morphologies can be controlled by the treatment. At the same time, the bulk mechanical properties of the treated materials remain unaltered. This indicates that NaOH treatment of 3D printed PLA scaffolds is a simple, yet viable strategy for surface activation without compromising the mechanical stability of PLA scaffolds.
KW  - surface modification
KW  - sodium hydroxide etching
KW  - poly(lactic acid)
KW  - 3D
KW  - printing
KW  - roughness
KW  - wettability
KW  - erosion
Y1  - 2020
U6  - https://doi.org/10.3390/polym12081711
SN  - 2073-4360
VL  - 12
IS  - 8
PB  - MDPI
CY  - Basel
ER  - 
TY  - GEN
A1  - Schneider, Matthias
A1  - Fritzsche, Nora
A1  - Puciul-Malinowska, Agnieszka
A1  - Balis, Andrzej
A1  - Mostafa, Amr
A1  - Bald, Ilko
A1  - Zapotoczny, Szczepan
A1  - Taubert, Andreas
T1  - Surface etching of 3D printed poly(lactic acid) with NaOH: a systematic approach
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - The article describes a systematic investigation of the effects of an aqueous NaOH treatment of 3D printed poly(lactic acid) (PLA) scaffolds for surface activation. The PLA surface undergoes several morphology changes and after an initial surface roughening, the surface becomes smoother again before the material dissolves. Erosion rates and surface morphologies can be controlled by the treatment. At the same time, the bulk mechanical properties of the treated materials remain unaltered. This indicates that NaOH treatment of 3D printed PLA scaffolds is a simple, yet viable strategy for surface activation without compromising the mechanical stability of PLA scaffolds.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1212 
KW  - surface modification
KW  - sodium hydroxide etching
KW  - poly(lactic acid)
KW  - 3D printing
KW  - roughness
KW  - wettability
KW  - erosion
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-525088
SN  - 1866-8372
IS  - 8
ER  -