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 OPUS4-52165 misc Block, Inga; Günter, Christina; Rodrigues, Alysson Duarte; Paasch, Silvia; Hesemann, Peter; Taubert, Andreas Carbon Adsorbents from Spent Coffee for Removal of Methylene Blue and Methyl Orange from Water Activated carbons (ACs) were prepared from dried spent coffee (SCD), a biological waste product, to produce adsorbents for methylene blue (MB) and methyl orange (MO) from aqueous solution. Pre-pyrolysis activation of SCD was achieved via treatment of the SCD with aqueous sodium hydroxide solutions at 90 °C. Pyrolysis of the pretreated SCD at 500 °C for 1 h produced powders with typical characteristics of AC suitable and effective for dye adsorption. As an alternative to the rather harsh base treatment, calcium carbonate powder, a very common and abundant resource, was also studied as an activator. Mixtures of SCD and CaCO3 (1:1 w/w) yielded effective ACs for MO and MB removal upon pyrolysis needing only small amounts of AC to clear the solutions. A selectivity of the adsorption process toward anionic (MO) or cationic (MB) dyes was not observed. 2021 20 Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe 14 urn:nbn:de:kobv:517-opus4-521653 10.25932/publishup-52165 Institut für Chemie OPUS4-4309 misc Li, Zhonghao; Taubert, Andreas Cellulose/gold nanocrystal hybrids via an ionic liquid/aqueous precipitation route Injection of a mixture of HAuCl4 and cellulose dissolved in the ionic liquid (IL) 1-butyl-3-methylimidazolium chloride [Bmim]Cl into aqueous NaBH4 leads to colloidal gold nanoparticle/cellulose hybrid precipitates. This process is a model example for a very simple and generic approach towards (noble) metal/cellulose hybrids, which could find applications in sensing, sterile filtration, or as biomaterials. 2009 urn:nbn:de:kobv:517-opus-45046 Institut für Chemie OPUS4-47442 misc Schneider, Matthias; Günter, Christina; Taubert, Andreas Co-deposition of a hydrogel/calcium phosphate hybrid layer on 3D printed poly(lactic acid) scaffolds via dip coating 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. 2018 21 Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe 1057 urn:nbn:de:kobv:517-opus4-474427 10.25932/publishup-47442 Institut für Chemie OPUS4-9517 misc Junginger, Mathias; Kübel, Christian; Schacher, Felix H.; Müller, Axel H. E.; Taubert, Andreas Crystal structure and chemical composition of biomimetic calcium phosphate nanofibers Calcium phosphate nanofibers with a diameter of only a few nanometers and a cotton-ball-like aggregate morphology have been reported several times in the literature. Although fiber formation seems reproducible in a variety of conditions, the crystal structure and chemical composition of the fibers have been elusive. Using scanning transmission electron microscopy, low dose electron (nano)diffraction, energy-dispersive X-ray spectroscopy, and energy-filtered transmission electron microscopy, we have assigned crystal structures and chemical compositions to the fibers. Moreover, we demonstrate that the mineralization process yields true polymer/calcium phosphate hybrid materials where the block copolymer template is closely associated with the calcium phosphate. 2013 7 11301 11308 urn:nbn:de:kobv:517-opus4-95176 Institut für Chemie OPUS4-8954 misc Hentrich, Doreen; Junginger, Mathias; Bruns, Michael; Börner, Hans Gerhard; Brandt, Jessica; Brezesinski, Gerald; Taubert, Andreas Interface-controlled calcium phosphate mineralization The phase behavior of an amphiphilic block copolymer based on a poly(aspartic acid) hydrophilic block and a poly(n-butyl acrylate) hydrophobic block was investigated at the air-water and air-buffer interface. The polymer forms stable monomolecular films on both subphases. At low pH, the isotherms exhibit a plateau. Compression-expansion experiments and infrared reflection absorption spectroscopy suggest that the plateau is likely due to the formation of polymer bi- or multilayers. At high pH the films remain intact upon compression and no multilayer formation is observed. Furthermore, the mineralization of calcium phosphate beneath the monolayer was studied at different pH. The pH of the subphase and thus the polymer charge strongly affects the phase behavior of the film and the mineral formation. After 4 h of mineralization at low pH, atomic force microscopy shows smooth mineral films with a low roughness. With increasing pH the mineral films become inhomogeneous and the roughness increases. Transmission electron microscopy confirms this: at low pH a few small but uniform particles form whereas particles grown at higher pH are larger and highly agglomerated. Energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy confirm the formation of calcium phosphate. The levels of mineralization are higher in samples grown at high pH. 2015 12 6901 6913 urn:nbn:de:kobv:517-opus4-89540 Institut für Chemie OPUS4-47506 misc Vioux, André; Taubert, Andreas Ionic liquids 2014 and selected papers from ILMAT 2013 2014 6 Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe 1055 urn:nbn:de:kobv:517-opus4-475062 10.25932/publishup-47506 Institut für Chemie OPUS4-40060 misc Zehbe, Kerstin; Kollosche, Matthias; Lardong, Sebastian; Kelling, Alexandra; Schilde, Uwe; Taubert, Andreas Ionogels based on poly(methyl methacrylate) and metal-containing ionic liquids 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. 2017 16 urn:nbn:de:kobv:517-opus4-400607 Institut für Chemie OPUS4-48733 misc Tao, Lumi; Liu, Yuchuan; Wu, Dan; Wei, Qiao-Hua; Taubert, Andreas; Xie, Zailai Luminescent Ionogels with Excellent Transparency, High Mechanical Strength, and High Conductivity 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. 2020 13 Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe 1058 urn:nbn:de:kobv:517-opus4-487334 10.25932/publishup-48733 Institut für Chemie OPUS4-9942 misc Xie, Zai-Lai; Huang, Xing; Titirici, Maria-Magdalena; Taubert, Andreas Mesoporous graphite nanoflakes via ionothermal carbonization of fructose and their use in dye removal The large-scale green synthesis of graphene-type two-dimensional materials is still challenging. Herein, we describe the ionothermal synthesis of carbon-based composites from fructose in the iron-containing ionic liquid 1-butyl-3-methylimidazolium tetrachloridoferrate(III), [Bmim][FeCl4] serving as solvent, catalyst, and template for product formation. The resulting composites consist of oligo-layer graphite nanoflakes and iron carbide particles. The mesoporosity, strong magnetic moment, and high specific surface area of the composites make them attractive for water purification with facile magnetic separation. Moreover, Fe3Cfree graphite can be obtained via acid etching, providing access to fairly large amounts of graphite material. The current approach is versatile and scalable, and thus opens the door to ionothermal synthesis towards the larger-scale synthesis of materials that are, although not made via a sustainable process, useful for water treatment such as the removal of organic molecules. 2014 urn:nbn:de:kobv:517-opus4-99427 Institut für Chemie OPUS4-58751 misc Behrens, Karsten; Balischewski, Christian; Sperlich, Eric; Menski, Antonia Isabell; Balderas-Valadez, Ruth Fabiola; Pacholski, Claudia; Günter, Christina; Lubahn, Susanne; Kelling, Alexandra; Taubert, Andreas Mixed chloridometallate(ii) ionic liquids with tunable color and optical response for potential ammonia sensors Eight d-metal-containing N-butylpyridinium ionic liquids (ILs) with the nominal composition (C4Py)2[Ni0.5M0.5Cl4] or (C4Py)2[Zn0.5M0.5Cl4] (M = Cu, Co, Mn, Ni, Zn; C4Py = N-butylpyridinium) were synthesized, characterized, and investigated for their optical properties. Single crystal and powder X-ray analysis shows that the compounds are isostructural to existing examples based on other d-metal ions. Inductively coupled plasma optical emission spectroscopy measurements confirm that the metal/metal ratio is around 50 : 50. UV-Vis spectroscopy shows that the optical absorption can be tuned by selection of the constituent metals. Moreover, the compounds can act as an optical sensor for the detection of gases such as ammonia as demonstrated via a simple prototype setup. 2022 11 Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe 1316 35072 35082 urn:nbn:de:kobv:517-opus4-587512 10.25932/publishup-58751 Institut für Chemie