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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 21 to 30 of 107 (0.018 seconds)| 21 |
Simple and Sensitive Colorimetric Detection of Dopamine Based on Assembly of Cyclodextrin-Modified Au NanoparticlesWen, Dan, Liu, Wei, Herrmann, Anne-Kristin, Haubold, Danny, Holzschuh, Matthias, Simon, Frank, Eychmüller, Alexander 21 November 2016 (has links) (PDF)
A controlled assembly of natural beta-cyclodextrin modified Au NPs mediated by dopamine is demonstrated. Furthermore, a simple and sensitive colorimetric detection for dopamine is established by the concentration-dependent assembly.
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Smart hydrogels as storage elements with dispensing functionality in discontinuous microfluidic systemsHaefner, Sebastian, Frank, Philipp, Elstner, Martin, Nowak, Johannes, Odenbach, Stefan, Richter, Andreas 07 April 2017 (has links) (PDF)
Smart hydrogels are useful elements in microfluidic systems because they respond to environmental stimuli and are capable of storing reagents. We present here a concept of using hydrogels (poly(N-isopropylacrylamide)) as an interface between continuous and discontinuous microfluidics. Their swelling and shrinking capabilities allow them to act as storage elements for reagents absorbed in the swelling process. When the swollen hydrogel collapses in an oil-filled channel, the incorporated water and molecules are expelled from the hydrogel and form a water reservoir. Water-in-oil droplets can be released from the reservoir generating different sized droplets depending on the flow regime at various oil flow rates (dispensing functionality). Different hydrogel sizes and microfluidic structures are discussed in terms of their storage and droplet formation capabilities. The time behaviour of the hydrogel element is investigated by dynamic swelling experiments and computational fluid dynamics simulations. By precise temperature control, the device acts as an active droplet generator and converts continuous to discontinuous flows.
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High capacity vertical aligned carbon nanotube/sulfur composite cathodes for lithium–sulfur batteriesDörfler, Susanne, Hagen, Markus, Althues, Holger, Tübke, Jens, Kaskel, Stefan, Hoffmann, Michael J. 09 April 2014 (has links) (PDF)
Binder free vertical aligned (VA) CNT/sulfur composite electrodes with high sulfur loadings up to 70 wt% were synthesized delivering discharge capacities higher than 800 mAh g−1 of the total composite electrode mass. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
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The influence of membrane bound proteins on phase separation and coarsening in cell membranesWitkowski, Thomas, Backofen, Rainer, Voigt, Axel 07 April 2014 (has links) (PDF)
A theoretical explanation of the existence of lipid rafts in cell membranes remains a topic of lively debate. Large, micrometer sized rafts are readily observed in artificial membranes and can be explained using thermodynamic models for phase separation and coarsening. In live cells such domains are not observed and various models are proposed to describe why the systems do not coarsen. We review these attempts critically and show within a phase field approach that membrane bound proteins have the potential to explain the different behaviour observed in vitro and in vivo. Large scale simulations are performed to compute scaling laws and size distribution functions under the influence of membrane bound proteins and to observe a significant slow down of the domain coarsening at longer times and a breakdown of the self-similarity of the size-distribution function. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
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A + B → C reaction fronts in Hele-Shaw cells under modulated gravitational accelerationEckert, Kerstin, Rongy, Laurence, De Wit, Anne 07 April 2014 (has links) (PDF)
The dynamics of A + B → C reaction fronts is studied under modulated gravitational acceleration by means of a combination of parabolic flight experiments and numerical simulations. During modulated gravity the front position undergoes periodic modulation with an accelerated front propagation under hyper-gravity together with a slowing down under low gravity. The underlying reason for this is an amplification and a decay, respectively, of the buoyancy-driven double vortex associated with the front propagation under standard gravitational acceleration, as explained by reaction–diffusion–convection simulations of convection around an A + B → C front. Deeper insights into the correlation between grey-value changes in the experimental shadowgraph images and characteristic changes in the concentration profiles are obtained by a numerical simulation of the imaging process. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
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Direct synthesis of carbide-derived carbon monoliths with hierarchical pore design by hard-templatingNickel, Winfried, Oschatz, Martin, von der Lehr, Martin, Leistner, Matthias, Hao, Guang-Ping, Adelhelm, Philipp, Müller, Philipp, Smarsly, Bernd M., Kaskel, Stefan 01 September 2014 (has links) (PDF)
Carbide-derived carbon Monoliths (CDC-Ms) containing a multimodal arrangement with high volumes of micro- meso- and macropores are prepared by direct nanocasting of silica monoliths with polycarbosilane precursors. CDC-Ms show well-defined pore structures along with specific surface areas of more than 2600 m2 g−1 and overall pore volumes as high as 3.14 cm3 g−1. They exhibit advanced gas filtration properties compared to purely microporous materials due to enhanced storage capacities and kinetics as demonstrated by thermal response measurements based on InfraSORP technology.
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Stimulus-Responsive Micro-Supercapacitors with Ultrahigh Energy Density and Reversible Electrochromic WindowZhang, Panpan, Zhu, Feng, Wang, Faxing, Wang, Jinhui, Dong, Renhao, Zhuang, Xiaodong, Schmidt, Oliver G., Feng, Xinliang 07 May 2018 (has links) (PDF)
No description available.
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Soft-Template Construction of 3D Macroporous Polypyrrole ScaffoldsLiu, Shaohua, Wang, Faxing, Dong, Renhao, Zhang, Tao, Zhang, Jian, Zheng, Zhikun, Mai, Yiyong, Feng, Xinliang 07 May 2018 (has links) (PDF)
No description available.
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Interface Engineering of MoS2/Ni3S2 Heterostructures for Highly Enhanced Electrochemical Overall Water Splitting ActivityZhang, Jian, Wang, Tao, Pohl, Darius, Rellinghaus, Bernd, Dong, Renhao, Liu, Shaohua, Zhuang, Xiaodong, Feng, Xinliang 08 May 2018 (has links) (PDF)
To achieve sustainable production of H2 fuel through water splitting, low-cost electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are required to replace Pt and IrO2 catalysts. Here, for the first time, we present the interface engineering of novel MoS2/Ni3S2 heterostructures, in which abundant interfaces are formed. For OER, such MoS2/Ni3S2 heterostructures show an extremely low overpotential of ~218 mV at 10 mA cm-2, which is superior to that of the state-of-the-art OER electrocatalysts. Using MoS2/Ni3S2 heterostructures as bifunctional electrocatalysts, an alkali electrolyser delivers a current density of 10 mA cm-2 at a very low cell voltage of ~1.56 V. In combination with density function theory (DFT) calculations, this study demonstrates that the constructed interfaces synergistically favor the chemisorption of hydrogen and oxygencontaining intermediates, thus accelerating the overall electrochemical water splitting.
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3D Assembly of All-Inorganic Colloidal Nanocrystals into Gels and AerogelsSayevich, Vladimir, Cai, Bin, Benad, Albrecht, Haubold, Danny, Sonntag, Luisa, Gaponik, Nikolai, Lesnyak, Vladimir, Eychmüller, Alexander 01 February 2017 (has links) (PDF)
We report on an efficient assembly approach to a variety of electrostatically stabilized all-inorganic semiconductor nanocrystals (NCs) via their linking with appropriate ions into multibranched gel networks. These all-inorganic non-ordered 3D assemblies can combine strong interparticle coupling which facilitates charge transport between the NCs with their diverse morphology, composition, size, and functional capping ligands. Moreover, the resulting dry gels (aerogels) are highly porous monolithic structures, which preserve the quantum confinement of their building blocks. The inorganic semiconductor aerogel made of 4.5 nm CdSe colloidal NCs, capped with iodide ions and bridged with Cd2+ ions, exhibited a surface area as high as 146 m2/g.
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