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Vu-Manh H.,University of Innsbruck | Vu-Manh H.,Hanoi University of Science and Technology | Wendler F.,Thuringian Institute for Textile and Plastics Research | Ozturk H.B.,University of Innsbruck | Bechtold T.,University of Innsbruck
Carbohydrate Polymers | Year: 2012

Dynamic rheology, UV/VIS spectrometry with temperature programming cuvette and reaction calorimetry were conducted on cellulose pulp/FeTNa (NaOH solution containing ferric tartaric acid complex) solutions to investigate their thermostability and spinnability. Color of cellulose/FeTNa solutions changed above 90 °C due to the decomposition of the complex. Thermal activity of cellulose/FeTNa solution started above 130 °C induced by water vapor evolution and complex decomposition. Regeneration of cellulose/FeTNa solutions in a non-solvent (acetic acid and Na-gluconate mixture) resulted in transition from cellulose I into cellulose II structure as revealed by WAXS measurements. Wet-spinning attempts of cellulose/FeTNa solutions yielded fiber-like shaped bodies with a brittle structure. © 2011 Elsevier Ltd. All Rights Reserved. Source

Doebel C.,Thuringian Institute for Textile and Plastics Research | Ament C.,TU Ilmenau
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2014

An adaptive, optimizing device management system for households called ENKOS is developed that is based on learning classifier systems (LCS). Established methods and algorithms are extended, and psychology methods are introduced to solve specific generalization and adoption problems. The two aims of ENKOS are firstly to minimize the electrical energy consumption within the household by interpreting the user's wishes as servable and controlling the devices in that kind, and secondly to maximize the consumer comfort by predicting the wishes of them by learning. This paper shows both the feasibility to meet the aims by using learning classifier systems with extensions as new methods, and the influence of several parameters towards the value of the learning rate of the objective function. © IFAC. Source

Eisenhawer B.,Institute of Photonic Technology | Sensfuss S.,Thuringian Institute for Textile and Plastics Research | Sivakov V.,Institute of Photonic Technology | Pietsch M.,Institute of Photonic Technology | And 3 more authors.
Nanotechnology | Year: 2011

Silicon nanowires have been introduced into P3HT:[60]PCBM solar cells, resulting in hybrid organic/inorganic solar cells. A cell efficiency of 4.2% has been achieved, which is a relative improvement of 10% compared to a reference cell produced without nanowires. This increase in cell performance is possibly due to an enhancement of the electron transport properties imposed by the silicon nanowires. In this paper, we present a novel approach for introducing the nanowires by mixing them into the polymer blend and subsequently coating the polymer/nanowire blend onto a substrate. This new onset may represent a viable pathway to producing nanowire-enhanced polymer solar cells in a reel to reel process. © 2011 IOP Publishing Ltd. Source

Cheng F.,University of Hull | Betts J.W.,University of Hull | Kelly S.M.,University of Hull | Schaller J.,Thuringian Institute for Textile and Plastics Research | Heinze T.,Friedrich - Schiller University of Jena
Green Chemistry | Year: 2013

A simple, environmentally friendly and cost-effective synthetic method has been developed to prepare highly stable aqueous colloidal solutions of small (2-14 nm) silver nanoparticles using aminocellulose (AMC) as a combined reducing and capping reagent. The effects of temperature, reaction time, the concentration of silver nitrate and AMC are systematically investigated and the reaction conditions optimised. The AMC-stabilized silver nanoparticles can be deposited on the surfaces of cotton fibres and microporous cellulose acetate (CA) filters, without affecting the permeability of the filters. The AMC-stabilized aqueous silver colloidal solutions and silver nanoparticle coated CA filters and cotton fibres all show significant antibacterial action against all the bacterial isolates tested, with the antibacterial levels between "Sufficient" and "Good", although some of solutions have been stored at room temperature for 18 months. © 2013 The Royal Society of Chemistry. Source

Konkin A.,TU Ilmenau | Ritter U.,TU Ilmenau | Scharff P.,TU Ilmenau | Roth H.-K.,Thuringian Institute for Textile and Plastics Research | And 3 more authors.
Synthetic Metals | Year: 2010

The new fullerene dimer adduct PCBM-C120O was studied as an electron acceptor by light-induced ESR (LESR) when blended with the electron donor-conjugated polymer M3EH-PPV in a thin solid film. ESR parameters for the PCBM-C120O anion radical and the M3EH-PPV polaron (triaxial gx,y,z factors) were determined by X- and K-band ESR techniques at temperatures of 77 and 120 K. It was found that isotropic g0 of PCBM-C120O anion radical ESR spectra obtained in this blend under illumination is close to g-factors of electrochemically reduced (C120-O)-{radical dot} and does not coincide with the analogous parameter of (C120-O)2-{radical dot}{radical dot} (reported in literature). Spin relaxation parameters (T1 and T2) of the PCBM-C120O anion radical and M3EH-PPV positive polaron are similar to T1, T2 for light-induced ion radicals in the P3HT/PCBM blend. © 2010 Elsevier B.V. All rights reserved. Source

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