Materials Literature
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This chapter deals with the emerging field of biomedical applications for magnesium-based materials, envisioning degradable implants that dissolve in the human body after having cured a particular medical condition. After outlining the background of this interest, some major aspects concerning degradable implants in g…
Thin film photovoltaics (PV) based on chalcopyrite absorbers of Cu(In, Ga)(S, Se)2 (CIGS) have been the subject of intense research for their potential to achieve high efficiency solar modules with lower cost than the pervasive crystalline silicon panels. Having realised world record efficiencies surpassing 22%, the d…
The use of optical techniques for material characterisation offer several advantages: it is non-destructive, useful in all pressure ranges, and a wide range of material systems can be probed.However, it is not always possible to isolate the surface or interface contribution.Epioptics refers to a special branch of opti…
Import 03/08/2012
13 páginas
The functionally graded concrete technology was invented at the Institut fur Leichtbau Entwerfen und Konstruieren (ILEK; Institute of Lightweight Structures and Conceptual Design) at the University of Stuttgart. At this institute, the new technology is currently being investigated and developed further in several rese…
The ability to construct well-defined and controlled hierarchical nanostructured porous architectures is desirable for enhancing the performance of electrochem. pseudocapacitors. Here, we propose design rules for improving capacitive energy storage: use of redox-active materials, high surface area for high capacity, m…
A series of glass based on (80-x) TeO2- 20 ZnO–x Er2O3 where 0<x≤ 2.5 mol % was prepared using melt quenching technique. The amorphosity of the glass was determined by X-ray diffraction (XRD) and the physical properties such as density and hardness was determined by means of Archimedes and Vickers Hardness method resp…
Metamaterials are artificial, structured materials that offer fascinating optical properties. Within this thesis, we have developed a method for fabrication of three-dimensional metallic structures with sub-micrometer feature sizes. It combines direct laser writing (laser lithography) and electrochemical deposition. T…
本實驗以兩階段水熱法合成CeO2─WO3核／殼奈米線與WO3─CeO2核／殼奈米棒，第一階段先合成出CeO2奈米線與WO3奈米棒核心結構，然後在核心奈米結構表面合成WO3與CeO2外殼。藉由中斷實驗，我們仔細觀察CeO2奈米線在成長過程的結構演變來討論其成長機制。合成產物的形貌、結構及組成是利用SEM、XRD、TEM觀察與分析。另外，我們也將四種奈米結構製成氣體感測元件並量測對CO與NO2的氣體感測特性。實驗結果顯示，CeO2奈米線的成長是利用Ostwald ripening （OR）的機制，先在溶液中均質成核形成Ce(OH)3團聚顆粒，在高鹼性環境中氧化為Ce(OH)4，在高溫高壓下Ce(OH)4轉變為CeO2，伴隨顆粒溶解和再…
本文设计合成了两个以卟啉为核心尾端分别连有亲水基团和疏水基团的枝状化合物，并对其在水中的聚集行为进行研究及表征。通过紫外可见(UV-vis)吸收光谱和扫描电子显微镜(SEM)的分析，发现在连有疏水基团的卟啉化合物1是H型聚集的棒状结构，而连有亲水基团的卟啉化合物2则是J型聚集的空心球结构(直径大约340 nm)，与纳米粒度分析仪计算的结果基本一致。所以我们得出，通过改变卟啉外部的取代基可以调控其纳米聚集体的形貌。 We designed and synthesized dendritic porphyrin which brings hydrophilic groups and hydrophobic groups. Their…
Cilj ovog rada bilo je ispitati mogućnosti mokrog podvodnog zavarivanja čelika za cjevovode API 5L X80. U uvodnom dijelu navedene su sve moderne tehnike mokrog i suhog podvodnog zavarivanja koje se danas koriste u off-shore industriji. Detaljno je obrađena fizika procesa, problematika, i svi tehnički aspekti tehnike m…
SiC-Ti
Arthrospira platensis is an alga that shows great promise as a human food source. It is rich in nutrients and both simple and inexpensive to cultivate. However, A. platensis requires relatively high temperatures for optimal growth: around 30oC. If a strain of A. platensis that is capable of growing in even slightly lo…
Results of a comparative study of diodes processed on n-type Cz grown Si substrates without and with Ge doping concentration of about 10(19) cm(-3) and 10(20) cm(-3) are presented. To investigate the influence of Ge doping on formation of the radiation induced defects, the as-processed diodes were irradiated with 2 Me…
Sulfur recovery units are particularly difficult to model since they are usually characterized by poor field instrumentation and the phenomena governing their main units and reactions are very complex and quite cumbersome to be explained by first-principles relationships. Specifically, the thermal reaction furnace is…
Synthetically produced nanoparticles play an important role in nanotechnology. They are the basis for many applications currently being used on a large scale, and they have a great potential in the development of new materials. The diversity of synthetic nanoparti-cles is considerable. They are distinct in their prope…
The properties of tasked nanocrystals in energy-related devices are strongly dependent on the presence and chem. nature of ligands at their surface, and the architectures they assume in electroactive layers. Here we will describe an exceptionally versatile class of reagents for native ligand stripping of carboxylate-,…
© 2012 Dr. Sarah Tzu-Feng Hsiao
Explosion simulation had been a common scene whether it has been used for scientific research or entertainment industry. Various approaches had been taken in order to bring out the most ideal result. The primary concerned of this project is on the calculation of displacement by using the spherical coordinates system.…