Dokument-ID Dokumenttyp Verfasser/Autoren Herausgeber Haupttitel Abstract Auflage Verlagsort Verlag Erscheinungsjahr Seitenzahl Schriftenreihe Titel Schriftenreihe Bandzahl ISBN Quelle der Hochschulschrift Konferenzname Quelle:Titel Quelle:Jahrgang Quelle:Heftnummer Quelle:Erste Seite Quelle:Letzte Seite URN DOI Abteilungen OPUS4-46466 Wissenschaftlicher Artikel Hentrich, Doreen; Taabache, Soraya; Brezesinski, Gerald; Lange, Nele; Unger, Wolfgang; Kuebel, Christian; Bertin, Annabelle; Taubert, Andreas A Dendritic Amphiphile for Efficient Control of Biomimetic Calcium Phosphate Mineralization The phase behavior of a dendritic amphiphile containing a Newkome-type dendron as the hydrophilic moiety and a cholesterol unit as the hydrophobic segment is investigated at the air-liquid interface. The amphiphile forms stable monomolecular films at the airliquid interface on different subphases. Furthermore, the mineralization of calcium phosphate beneath the monolayer at different calcium and phosphate concentrations versus mineralization time shows that at low calcium and phosphate concentrations needles form, whereas flakes and spheres dominate at higher concentrations. Energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and electron diffraction confirm the formation of calcium phosphate. High-resolution transmission electron microscopy and electron diffraction confirm the predominant formation of octacalcium phosphate and hydroxyapatite. The data also indicate that the final products form via a complex multistep reaction, including an association step, where nano-needles aggregate into larger flake-like objects. Weinheim Wiley-VCH 2017 14 Macromolecular bioscience 17 2541 2548 10.1002/mabi.201600524 Institut für Biochemie und Biologie OPUS4-46089 Wissenschaftlicher Artikel Abouserie, Ahed; Zehbe, Kerstin; Metzner, Philipp; Kelling, Alexandra; Günter, Christina; Schilde, Uwe; Strauch, Peter; Körzdörfer, Thomas; Taubert, Andreas Alkylpyridinium Tetrahalidometallate Ionic Liquids and Ionic Liquid Crystals: Insights into the Origin of Their Phase Behavior Six N-alkylpyridinium salts [CnPy](2)[MCl4] (n = 4 or 12 and M = Co, Cu, Zn) were synthesized, and their structure and thermal properties were studied. The [C4Py](2)[MCl4] compounds are monoclinic and crystallize in the space group P2(1)/n. The crystals of the longer chain analogues [C12Py](2)[MCl4] are triclinic and crystallize in the space group P (1) over bar. Above the melting temperature, all compounds are ionic liquids (ILs). The derivatives with the longer C12 chain exhibit liquid crystallinity and the shorter chain compounds only show a melting transition. Consistent with single-crystal analysis, electron paramagnetic resonance spectroscopy suggests that the [CuCl4](2-) ions in the Cu-based ILs have a distorted tetrahedral geometry. Weinheim Wiley-VCH 2017 10 European journal of inorganic chemistry : a journal of ChemPubSoc Europe 5640 5649 10.1002/ejic.201700826 Institut für Chemie OPUS4-45922 Wissenschaftlicher Artikel Abouserie, Ahed; Zehbe, Kerstin; Metzner, Philipp; Kelling, Alexandra; Günter, Christina; Schilde, Uwe; Strauch, Peter; Körzdörfer, Thomas; Taubert, Andreas Alkylpyridinium Tetrahalidometallate Ionic Liquids and Ionic Liquid Crystals: Insights into the Origin of Their Phase Behavior Six N-alkylpyridinium salts [CnPy](2)[MCl4] (n = 4 or 12 and M = Co, Cu, Zn) were synthesized, and their structure and thermal properties were studied. The [C4Py](2)[MCl4] compounds are monoclinic and crystallize in the space group P2(1)/n. The crystals of the longer chain analogues [C12Py](2)[MCl4] are triclinic and crystallize in the space group P (1) over bar. Above the melting temperature, all compounds are ionic liquids (ILs). The derivatives with the longer C12 chain exhibit liquid crystallinity and the shorter chain compounds only show a melting transition. Consistent with single-crystal analysis, electron paramagnetic resonance spectroscopy suggests that the [CuCl4](2-) ions in the Cu-based ILs have a distorted tetrahedral geometry. Weinheim Wiley-VCH 2017 10 European journal of inorganic chemistry : a journal of ChemPubSoc Europe 5640 5649 10.1002/ejic.201700826 Institut für Chemie OPUS4-55187 Wissenschaftlicher Artikel Lutze, Jana; Bañares, Miguel A.; Pita, Marcos; Haase, Andrea; Luch, Andreas; Taubert, Andreas alpha-((4-Cyanobenzoyl)oxy)-omega-methyl poly(ethylene glycol) The article describes the synthesis and properties of alpha-((4-cyanobenzoyl)oxy)-omega-methyl poly(ethylene glycol), the first poly(ethylene glycol) stabilizer for metal nanoparticles that is based on a cyano rather than a thiol or thiolate anchor group. The silver particles used to evaluate the effectiveness of the new stabilizer typically have a bimodal size distribution with hydrodynamic diameters of ca. 13 and ca. 79 nm. Polymer stability was evaluated as a function of the pH value both for the free stabilizer and for the polymers bound to the surface of the silver nanoparticles using H-1 NMR spectroscopy and zeta potential measurements. The polymer shows a high stability between pH 3 and 9. At pH 12 and higher the polymer coating is degraded over time suggesting that alpha-((4-cyanobenzoyl) oxy)-omega-methyl poly(ethylene glycol) is a good stabilizer for metal nanoparticles in aqueous media unless very high pH conditions are present in the system. The study thus demonstrates that cyano groups can be viable alternatives to the more conventional thiol/thiolate anchors. Frankfurt, Main Beilstein-Institut zur Förderung der Chemischen Wissenschaften 2017 9 Beilstein journal of nanotechnology 8 627 635 10.3762/bjnano.8.67 Institut für Chemie OPUS4-46217 Wissenschaftlicher Artikel Hentrich, Doreen; Brezesinski, Gerald; Kuebel, Christian; Bruns, Michael; Taubert, Andreas Cholesteryl Hemisuccinate Monolayers Efficiently Control Calcium Phosphate Nucleation and Growth The article describes the phase behavior of cholesteryl hemisuccinate at the air-liquid interface and its effect on calcium phosphate (CP) mineralization. The amphiphile forms stable monolayers with phase transitions at the air-liquid interface from a gas to a tilted liquid-condensed (TLC) and finally to an untilted liquid-condensed (ULC) phase. CP mineralization beneath these monolayers leads to crumpled CP layers made from individual plates. The main crystal phase is octacalcium phosphate (OCP) along with a minor fraction of hydroxyapatite (HAP), as confirmed by X-ray photoelectron spectroscopy, energy dispersive X-ray spectroscopy, bright field transmission electron microscopy, and electron diffraction. Washington American Chemical Society 2017 11 Crystal growth & design : integrating the fields of crystal engineering and crystal growth for the synthesis and applications of new materials 17 5764 5774 10.1021/acs.cgd.7b00753 Institut für Chemie OPUS4-46541 Wissenschaftlicher Artikel Peh, Eddie; Liedel, Clemens; Taubert, Andreas; Tauer, Klaus Composition inversion to form calcium carbonate mixtures Composition inversion takes place in equimolar solid mixtures of sodium or ammonium carbonate and calcium chloride with respect to the combination of anions and cations leading to the corresponding chloride and calcite in complete conversion. The transformation takes place spontaneously under a variety of different situations, even in a powdery mixture resting under ambient conditions. Powder X-ray diffraction data and scanning electron microscopy micrographs are presented to describe the course of the reaction and to characterize the reaction products. The incomplete reaction in the interspace between two compressed tablets of pure starting materials leads to an electric potential due to the presence of uncompensated charges. Cambridge Royal Society of Chemistry 2017 11 CrystEngComm 19 3573 3583 10.1039/c7ce00433h Institut für Chemie OPUS4-46918 misc Hentrich, Doreen; Tauer, Klaus; Espanol, Montserrat; Ginebra, Maria-Pau; Taubert, Andreas EDTA and NTA effectively tune the mineralization of calcium phosphate from bulk aqueous solution This study describes the effects of nitrilotriacetic acid (NTA) and ethylenediaminotetraacetic acid (EDTA) on themineralization of calciumphosphate from bulk aqueous solution. Mineralization was performed between pH 6 and 9 and with NTA or EDTA concentrations of 0, 5, 10, and 15 mM. X-ray diffraction and infrared spectroscopy show that at low pH, mainly brushite precipitates and at higher pH, mostly hydroxyapatite forms. Both additives alter the morphology of the precipitates. Without additive, brushite precipitates as large plates. With NTA, the morphology changes to an unusual rod-like shape. With EDTA, the edges of the particles are rounded and disk-like particles form. Conductivity and pH measurements suggest that the final products form through several intermediate steps. 2017 23 Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe 1095 urn:nbn:de:kobv:517-opus4-469186 10.25932/publishup-46918 Institut für Biochemie und Biologie OPUS4-46917 Wissenschaftlicher Artikel Hentrich, Doreen; Tauer, Klaus; Espanol, Montserrat; Ginebra, Maria-Pau; Taubert, Andreas EDTA and NTA effectively tune the mineralization of calcium phosphate from bulk aqueous solution This study describes the effects of nitrilotriacetic acid (NTA) and ethylenediaminotetraacetic acid (EDTA) on themineralization of calciumphosphate from bulk aqueous solution. Mineralization was performed between pH 6 and 9 and with NTA or EDTA concentrations of 0, 5, 10, and 15 mM. X-ray diffraction and infrared spectroscopy show that at low pH, mainly brushite precipitates and at higher pH, mostly hydroxyapatite forms. Both additives alter the morphology of the precipitates. Without additive, brushite precipitates as large plates. With NTA, the morphology changes to an unusual rod-like shape. With EDTA, the edges of the particles are rounded and disk-like particles form. Conductivity and pH measurements suggest that the final products form through several intermediate steps. Basel MDPI 2017 21 Biomimetics 2 4 10.3390/biomimetics2040024 Institut für Biochemie und Biologie OPUS4-49702 Wissenschaftlicher Artikel Unuabonah, Emmanuel Iyayi; Agunbiade, Foluso O.; Alfred, Moses O.; Adewumi, Thompson A.; Okoli, Chukwunonso P.; Omorogie, Martins O.; Akanbi, Moses O.; Ofomaja, Augustine E.; Taubert, Andreas Facile synthesis of new amino-functionalized agrogenic hybrid composite clay adsorbents for phosphate capture and recovery from water New hybrid clay materials with good affinity for phosphate ions were developed from a combination of biomass-Carica papaya seeds (PS) and Musa paradisiaca (Plantain peels-PP), ZnCl2 and Kaolinite clay to produce iPS-HYCA and iPP-HYCA composite adsorbents respectively. Functionalization of these adsorbents with an organosilane produced NPS-HYCA and NPP-HYCA composite adsorbents. The pH(pzc) for the adsorbents were 7.83, 6.91, 7.66 and 6.55 for iPS-HYCA, NPS-HYCA, iPP-HYCA and NPP-HYCA respectively. Using the Brouer-Sotolongo isotherm model which best predict the adsorption capacity of composites for phosphate, iPP-HYCA, iPS-HYCA, NPP-HYCA, and NPS-HYCA composite adsorbents respectively. When compared with some commercial resins, the amino-functionalized adsorbents had better adsorption capacities. Furthermore, amino-functionalized adsorbents showed improved adsorption capacity and rate of phosphate uptake (as much as 40-fold), as well as retain 94% (for NPS-HYCA) and 84.1% (for NPP-HYCA) efficiency for phosphate adsorption after 5 adsorption-desorption cycles (96 h of adsorption time with 100 mg/L of phosphate ions) as against 37.5% (for iPS-HYCA) and 35% (for iPP-HYCA) under similar conditions. In 25 min desorption of phosphate ion attained equilibrium. These new amino-functionalized hybrid clay composite adsorbents, which were prepared by a simple means that is sustainable, have potentials for the efficient capture of phosphate ions from aqueous solution. They are quickly recovered from aqueous solution, non-biodegradable (unlike many biosorbent) with potentials to replace expensive adsorbents in the future. They have the further advantage of being useful in the recovery of phosphate for use in agriculture which could positively impact the global food security programme. (C) 2017 Elsevier Ltd. All rights reserved. Oxford Elsevier 2017 12 Journal of Cleaner Production 164 652 663 10.1016/j.jclepro.2017.06.160 Institut für Chemie OPUS4-55157 Wissenschaftlicher Artikel Taubert, Andreas; Löbbicke, Ruben; Kirchner, Barbara; Leroux, Fabrice First examples of organosilica-based ionogels The article describes the synthesis and properties of new ionogels for ion transport. A new preparation process using an organic linker, bis(3-(trimethoxysilyl) propyl) amine (BTMSPA), yields stable organosilica matrix materials. The second ionogel component, the ionic liquid 1-methyl-3-(4-sulfobutyl) imidazolium 4-methylbenzenesulfonate, [BmimSO(3)H][PTS], can easily be prepared with near-quantitative yields. [BmimSO(3)H][PTS] is the proton conducting species in the ionogel. By combining the stable organosilica matrix with the sulfonated ionic liquid, mechanically stable, and highly conductive ionogels with application potential in sensors or fuel cells can be prepared. Frankfurt, Main Beilstein-Institut zur Förderung der Chemischen Wissenschaften 2017 16 Beilstein journal of nanotechnology 8 736 751 10.3762/bjnano.8.77 Institut für Chemie