Materials Literature
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Over the last two decades three dimensionally ordered macroporous (3-DOM) materials have turned out to be very promising in many applications ranging from optics, plasmonics, to catalyst scaffolds. The thesis presents a systematic study on formation and characterisation of 3-DOM metals as photonic crystals. Metals are…
The objective of this project is to qualitatively and quantitatively study protein adsorption behaviour on ion exchange chromatography beads. Knowing the protein-particle interaction facilitates the study and choice of resin chemistry required for better chromatographic performance and resolution towards different pro…
The superconducting properties of polycrystalline Sr0.6K0.4Fe2As2 were strongly influenced by Ag doping (Supercond. Sci. Technol. 23 (2010) 025027). Ag addition is mainly dominated by silver diffusing, so the annealing process is one of the essential factors to achieve high quality Ag doped Sr0.6K0.4Fe2As2. In this pa…
A series of Fe₅₂Pt₄₈, Fe₅₂․₃Pt₄₆․₃Ta₁․₄ and Fe₅₂Pt₄₀․₇Ta₇․₃ thin films were sputter- deposited and subsequently annealed at 550°C and 750°C for 30 min. The as-deposited films adopted the A1 phase. The addition of Ta resulted in the change in the {111} to {200} fiber texture for these films. This has been explained in…
The multiferroic composites with nominal stoichiometry Bi0.8Dy0.2Fe1-yTiyO3+delta were fabricated by adding Ti to Bi0.8Dy0.2FeO3 through a two-stage solid-state reaction method. In the composites obtained, the major phase was isostructural to Bi0.8Dy0.2FeO3, and the secondary phase of Dy3Fe5O12 was also detected. Most…
The main project is to investigate the free energy in perfect crystal lattice in Face-Centre-Cubic (FCC), Hexagonal-Close-Packing (HCP) and Body-Centre-Cubic (BCC) hard-sphere crystals as well as free energy of monovacancies in the face-centre-cubic (FCC) and hexagonal-close-packed (HCP) hard-sphere crystals. Solid st…
In semiconductor manufacturing, megasonic cleaning may play an important role for nano-particle removal, if the underlying physical processes are thoroughly understood. As shown in recent years, acoustic cavitation is the main contributor to surface cleaning. Crucial parts of the overall cleaning process are therefore…
The Full Zone model of the thermocapillary (Marangoni) flow in a liquid bridge with an axial magnetic field, measured by the Hartmann number Ha, is studied using a Chebyshev spectral method for low Prandtl number fluids. By introducing a 2nd order vorticity transport formulation, high resolution Gauss-Lobatto grids ca…
The use of copper alloys is known from ancient times and they were appreciated for several reasons: they are easy to cast, have a wide range of mechanical properties and appearance, and good resistance to corrosion. Most of these properties are affected by composition, and the desired properties could be obtained by t…
본 연구에서는 균일부식이 발생하는 저합금강의 노출면적에 따른 부식속도의 변화를 관찰하고 이에 대한 원인을 규명하고자 하였다. 다양한 표면적을 지닌 동일한 저합금강 시편의 부식속도를 전기 화학적 임피던스 분광법, 직선분극저항 측정법, 동전위 분극 시험법을 이용하여 산출하였다. 또한 전자주사현미경, X선 광전자 분광법 및 X선 전자탐침 미량분석을 이용하여 표면분석을 실시하였다. 전기화학적 시험 결과 모든 시험법에서 시편의 크기가 증가할수록 부식속도가 높게 산출되었으며, 표면분석을 통해 망간과 황으로 구성된 화합물이 존재하는 영역에서 우선적으로 부식이 발생하며, 이 화합…
Thermo-molded wheat gluten plastics: effect of molding temperature, molding time and gluten moisture content on the gluten network Koen J.A. Jansens, Bert Lagrain, Kristof Brijs, Mario Smet and Jan A. Delcour Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe),…
Fabrication, light emission, and magnetism of silica nanoparticles hybridized with AIE luminogens and inorganic nanostructures by Mahtab Faisal thesis 2010 xxxvi, 292 p. : ill. (some col.) ; 30 cm Much research efforts have been devoted in developing new synthetic…Read more ›
The change from tetragonal to orthorhombic phase due to annealing also changes the electrical and optical properties of tin oxide thin films. X-ray diffraction and Atomic force microscopy studies reveal the changes in the phase and grain merger with annealing of as-grown tin oxide thin films. Optical bandgap increase…
This work focused on the synthesis and study of new transition metal clusters capable of multielectron exchange. Reactions of the ligand precursor 1,1'-ferrocenedicarboxylic acid (fdcH2) in the presence of preformed clusters, such as [Mn12O12(O2CMe)16(H2O)4], led to the isolation of two [Mn13O6(OR)6(fdc)6] clusters, w…
We explore the duality between metric and material properties in the Maxwell’s equations to design metamaterial blueprints for cladding control of waveguide modes. We illustrate designs for circular and rectangular waveguides. In contrast to standard material loading of waveguides, the proposed cladding does not produ…
文章采用共沉淀法制备了Ru/ZrO2.xH2O催化剂对丙酸甲酯进行加氢反应研究,并用XRD和XPS对反应前后催化剂进行了表征。考察了催化剂制备时机械搅拌速度、沉淀剂的种类、沉淀时溶液PH值、催化剂灼烧温度及金属担载量等因素对Ru/ZrO2.xH2O催化性能影响。结果表明,增加搅拌速度、选择合适的沉淀剂以及Ru担载量能够明显提高催化剂加氢活性,而加大沉淀时溶液PH和升高催化剂灼烧温度则对催化剂性能有抑制作用。
Birnessite-type MnO2 hierarchical hollow structures were prepared through a self-template route, by the direct reaction between the aqueous solution of KMnO4, and solid MnCO3 precursor crystals, and followed by the removal of MnCO3 core with HCl. Field emission scanning microscopy (FESEM) images indicate that the shel…
合成了氰根桥联配合物[(Ni(2’2-bipy)2)3(Fe(CN)6)2].13H2O,使用元素分析、红外光谱等对配合物进行了表征。红外光谱显示金属离子通过氰根桥联传递磁相互作用,是属于桥式氰根配体的CN伸缩振动。对该配合物的磁化率测定表明金属离子通过氰根传递磁作用,求得分子磁体有效磁距μeff。并根据Curie-Weiss定律拟合获得居里常数C=6.83cm3.kmol-1和顺磁居里温度θ=9.39K。更多还原
Senior Scientist, Bill McCallum, briefly discusses rare-earth magnets and their uses and how Ames Lab is research new ways to save money and energy using magnets.
Le procede SMART CUT™ permet d’obtenir une tres fine couche de silicium isolee electriquement d’un substrat. Le substrat est egalement du silicium monocristallin et l’isolant, de l’oxyde de silicium. Une etape destabilise par implantation la cristallinite d’un premier substrat de silicium, sur une fine couche enterree…