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Wunderlich, Stefan,Zä,hres, Manfred,Jo, Byung-Wook,Hess, Michael WILEY-VCH Verlag 2007 Macromolecular symposia Vol.258 No.1
<P>Summary: We have used warfarin as a local probe to investigate the orientation of paclitaxel and water soluble polymer conjugates of paxlitaxel in albumin. The relative orientation of warfarin and paclitaxel in a 1:1 complex in solution was investigated by <SUP>1</SUP>H-NMR-spektroskopy (NOESY) and the results are used for the interpretation of the steric situation of paclitaxel respectively the polymer conjugate in albumin.</P>
Microstructure and seebeck voltage of NaTaO3 composite ceramics with additions of Mn, Cr, Fe or Ti
Wilfried Wunderlich,Susumu Soga 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.2
This paper reports about Seebeck measurements of the perovskite phase NaTaO3. To increase the carrier concentration,specimens including metallic transition metals such as Mn, Cr, Fe, Ti were sintered at 1273 K and 1473 K. Mircostructural characterization by SEM and XRD showed that besides the perovskite phase, transition metal oxides are present. The solubility limit of NaTaO3 increases with the sintering temperature and is about 17% in the case of Fe after sintering at 1473 K for 10 h. For NaTaO3 with 50 mol% Fe2O3 at a temperature difference of 800 K a Seebeck voltage of −320 mV was measured. This is the highest Seebeck voltage among all the specimens and leads to a Seebeck coefficient of −0.45 mV/K. The specific electric resistivity decreases with an increase in the temperature from 50MΩm at room temperature to 5 Ωm at 1273 K. The power factor of this new n-type thermoelectric candidate material is estimated.
Calculations on different length scales for improving processing of nanoceramics
Wilfried Wunderlich 한양대학교 세라믹연구소 2004 Journal of Ceramic Processing Research Vol.5 No.1
Advanced processing of nano-ceramic composite materials requires an understanding of physical phenomena on an atomistic scale by ab-initio calculations. This overview continues a previous report and is divided into three parts. After describing the goals and the range of possible applications of such simulations, the needs for simulations of new applications of ceramics, namely for photovoltaic and thermoelectric materials, are briefly summarized. The most challenging subject for ab-initio calculations, however, is an understanding of physical phenomena in aqueous solutions and their present results are described in the third part. Based on experimental results, the simulation of Al-Mg-spinel formation with different methods, the discrete element method (DEM) and Molecular Dynamics (MD) is described. The appropriate approach for the numerical treatment of these many-particle interactions in liquids is the Voronoi- method, for which some new ideas are presented in this paper. For ab-initio calculations the software Vasp with its great facilities is appropriate.
Wilfried Wunderlich,Torsten Oekermann,Lei Miao,Nguyen Thi Hue,Sakae Tanemura,Masaki Tanemura 한양대학교 세라믹연구소 2004 Journal of Ceramic Processing Research Vol.5 No.4
The electronic properties of anatase, rutile and ZnO thin films are of interest for many applications such as photocatalysis, or dye-sensitised solar cells. This paper describes the correlation between microstructure and electronic properties of photoactive TiO2 and ZnO thin films, which are based on experimental data and are interpreted by ab-initio simulations. This study considers the influence of three main factors on the optical and electrical properties: Strain of epitaxially grown thin films, nano-particle- and nano-pore- structures, and finally the interface to adsorbed dye molecules. The first part describes the search for a suitable substrate to grow titania layers with a smaller band-gap and ab-initio simulations showed excellent agreement to the experimental data. A narrow band gap is predicted for strained lattice constants in the a-direction and compressed in the c-direction. The second part describes the fabrication of nano-porous thin films by sol-gel processing using appropriate precursor solutions (titanium-tetra-iso-propanol(TTIP), di-ethanol-amine (DEA)) applied on suitable nanotemplates. Due to the surface curvatures the nano-porous TiO2 has a narrow band gap, while nano-particles of titania show a larger band-gap. In the third part Dvxα ab-initio simulations were applied to dye-sensitized solar cells (DSSC), based on ZnO and TiO2. The results are compared to experimental data obtained for different dyes on nanoporous electrodeposited ZnO films. The ranking in efficiency found experimentally for the different combinations could be explained by the calculation results. This finding is discussed in the view of further optimization of solar cells.
Horst Wunderlich,오덕성 대한건축학회 1989 建築 Vol.33 No.3
본 연구는 독일내 대규모 아파트 건설의 역사적인 발전 맥락과 현재의 문제점을 파악하고, 지금까지 활발하게 제안되고 있는 발전 방향의 원칙과 이를 통해 실제 사례 아파트 단지의 계획 방향을 제시하는데 그 목적이 있다.
대규모 아파트 단지의 문제점과 개량화 방안에 관한 연구 : 서독의 사례를 중심으로
호르스트 분더리히,오덕성 忠南大學校 産業技術硏究所 1989 산업기술연구논문집 Vol.4 No.1
The purpose of this study is to analyze the problems of declined apartmenthouse estates in german cities and also to find out the directions of their redevelopments. For the study, the general conditions of residential activities and social needs are analyzed in the case of several apartmenthouse estates, which were constructed in urban areas from 1920 to 1980. As a Result, this study suggests the fundamental methodologies for the renovation of declined apartmenthous estates.