TY  - JOUR
A1  - Göbel, Ronald
A1  - Stoltenberg, Marcus
A1  - Krehl, Stefan
A1  - Biolley, Christine
A1  - Rothe, Regina
A1  - Schmidt, Bernd
A1  - Hesemann, Peter
A1  - Taubert, Andreas
T1  - A Modular Approach towards Mesoporous Silica Monoliths with Organically Modified Pore Walls: Nucleophilic Addition, Olefin Metathesis, and Cycloaddition
JF  - European journal of inorganic chemistry : a journal of ChemPubSoc Europe
N2  - We have synthesized mesoporous silica (monoliths) with defined surface chemistry by means of a number of addition reactions: (i) coupling of an isocyanate to a surface-immobilized thiol, (ii) addition of an epoxide to a surface-immobilized thiol, (iii) cross-metathesis between two olefins, and (iv) Huisgen [2+3] cycloaddition of an alkyne-functionalized silica monolith with an azide. Functionalization of the mesopores was observed, but there are significant differences between individual approaches. Isocyanate and epoxide additions lead to high degrees of functionalization, whereas olefin metathesis and [2+3] cycloaddition are less effective. We further show that the efficiency of the modification is about twice as high in mesoporous silica particles than in macroscopic silica monoliths.
KW  - Mesoporous materials
KW  - Hybrid materials
KW  - Surface chemistry
KW  - Click chemistry
KW  - Nucleophilic addition
Y1  - 2016
U6  - https://doi.org/10.1002/ejic.201500638
SN  - 1434-1948
SN  - 1099-0682
VL  - 6
SP  - 2088
EP  - 2099
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Zehbe, Kerstin
A1  - Kollosche, Matthias
A1  - Lardong, Sebastian
A1  - Kelling, Alexandra
A1  - Schilde, Uwe
A1  - Taubert, Andreas
T1  - Ionogels Based on Poly(methyl methacrylate) and Metal-Containing Ionic Liquids: Correlation between Structure and Mechanical and Electrical Properties
JF  - International journal of molecular sciences
N2  - Ionogels (IGs) based on poly(methyl methacrylate) (PMMA) and the metal-containing ionic liquids (ILs) bis-1-butyl-3-methlimidazolium tetrachloridocuprate(II), tetrachloride cobaltate(II), and tetrachlorido manganate(II) have been synthesized and their mechanical and electrical properties have been correlated with their microstructure. Unlike many previous examples, the current IGs show a decreasing stability in stress-strain experiments on increasing IL fractions. The conductivities of the current IGs are lower than those observed in similar examples in the literature. Both effects are caused by a two-phase structure with micrometer-sized IL-rich domains homogeneously dispersed an IL-deficient continuous PMMA phase. This study demonstrates that the IL-polymer miscibility and the morphology of the IGs are key parameters to control the (macroscopic) properties of IGs.
KW  - microstructure
KW  - ionogels
KW  - ionic liquids
KW  - phase separation
KW  - mechanical properties
KW  - ionic conductivity
Y1  - 2016
U6  - https://doi.org/10.3390/ijms17030391
SN  - 1422-0067
VL  - 17
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Taubert, Andreas
A1  - Balischewski, Christian
A1  - Hentrich, Doreen
A1  - Elschner, Thomas
A1  - Eidner, Sascha
A1  - Günter, Christina
A1  - Behrens, Karsten
A1  - Heinze, Thomas
T1  - Water-Soluble Cellulose Derivatives Are Sustainable Additives for Biomimetic Calcium Phosphate Mineralization
JF  - Inorganics : open access journal
N2  - The effect of cellulose-based polyelectrolytes on biomimetic calcium phosphate mineralization is described. Three cellulose derivatives, a polyanion, a polycation, and a polyzwitterion were used as additives. Scanning electron microscopy, X-ray diffraction, IR and Raman spectroscopy show that, depending on the composition of the starting solution, hydroxyapatite or brushite precipitates form. Infrared and Raman spectroscopy also show that significant amounts of nitrate ions are incorporated in the precipitates. Energy dispersive X-ray spectroscopy shows that the Ca/P ratio varies throughout the samples and resembles that of other bioinspired calcium phosphate hybrid materials. Elemental analysis shows that the carbon (i.e., polymer) contents reach 10% in some samples, clearly illustrating the formation of a true hybrid material. Overall, the data indicate that a higher polymer concentration in the reaction mixture favors the formation of polymer-enriched materials, while lower polymer concentrations or high precursor concentrations favor the formation of products that are closely related to the control samples precipitated in the absence of polymer. The results thus highlight the potential of (water-soluble) cellulose derivatives for the synthesis and design of bioinspired and bio-based hybrid materials.
KW  - cellulose
KW  - polyamine
KW  - polyammonium salt
KW  - polycarboxylate
KW  - polyzwitterion
KW  - calcium phosphate
KW  - biomineralization
KW  - brushite
KW  - hydroyxapatite
KW  - biomaterial
Y1  - 2016
U6  - https://doi.org/10.3390/inorganics4040033
SN  - 2304-6740
VL  - 4
PB  - MDPI
CY  - Basel
ER  -