Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Detailed and consistent crystal field analysis of the LiGa 5 O 8 :Cr 3+ absorption spectrum is performed in the present paper by using the exchange charge model of crystal field. We calculate the crystal field parameters from the crystal structure date and diagonalize the crystal field Hamiltonian to obtain the energy…
1. Symmetry in Crystals: Fundamentals 2. Point Groups and Lattice Types 3. Space-Group Symmetry 4. X-ray Diffraction Techniques 5. The Structure Factor and the Electron Density 6. The Patterson Function 7. Structure-Factor Statistics 8. Direct Methods 9. Atomic Displacement Parameters 10. Refinement of Structural Para…
Abstract The nonisothermal crystallization kinetics of poly(vinylidene fluoride) (PVDF) in PVDF/dibutyl phthalate (DBP)/di(2‐ethylhexyl)phthalate (DEHP) blends via thermally induced phase separation were investigated through differential scanning calorimetry measurements. The Ozawa approach failed to describe the crys…
Abstract Growth mechanisms of carbon nanotubes are investigated and compared for both high‐ and low‐temperature synthesis methods through experiments utilizing time‐resolved, in situ imaging and spectroscopy. High‐speed videography and pyrometry measured the timeframes for growth for single‐wall carbon nanotubes (SWNT…
In this paper, a summary of some of the recent research efforts in our laboratory on chemical interactions at noble metal nanoparticle surfaces is presented. The article is divided into five sections, detailing with (i) interactions of simple halocarbons with gold and silver nanoparticle surfaces at room temperature b…
We’ve built this digital research platform to provide academics everywhere with fast, stable and secure digital access to our library of over 110,000 scholarly books and 800,000 journal articles. We’ve tested the platform in close cooperation with leading academic institutions. If you have any questions or you notice…
Liquid‐crystalline (LC) monomers, which were functionalized with a cinnamoyl group on their extremity, were synthesized and irradiated with UV light in their LC phases. In the presence of a triplet sensitizer, most LC monomers were converted into the corresponding dimers, which were produced by the cycloaddition react…
A 1.7-fold enhancement in the spontaneous emission intensity of dye chromophore loaded in a printable polymer is achieved by coupling the dye emission to surface plasmons of metallic nanoparticles. The nanocomposite material, embossed into arrays of wires by nanoimprint lithography process, shows good imprint properti…
The use of silicon based light emitting diodes may completely solve the problem of low compatibility of optoelectronics elements and silicon chip. At present time the most suitable kinds of Si-LEDs are monocrystal and porous silicon avalanche LEDs. They have advantages such as long operation lifetime (> 10000 hours),…
Doping of the ZnGeAs2 semiconductor with manganese has produced compositions with spontaneous magnetization and high Curie temperatures of up to 367 K for the composition 3.5 wt% Mn. Their magnetic properties are characteristic of spin glasses at temperatures T < T S and magnetic fields H < 11 kOe. In stronger fields,…
Abstract Pressure tubes in CANDUCANada Deuterium Uranium (CANDU) is a registered trademark of Atomic Energy of Canada Limited and RBMK reactors are fabricated from Zr-2.5Nb alloy. This paper describes the mechanical properties of tubes used in power reactors made by four routes using electrolytic powder as the base ma…
The potential hazards from cyclopentadiene storage and use on kilogram scale are studied under adiabatic conditions. Cyclopentadiene, a reagent commonly used in organic synthesis, is known to spontaneously dimerize exothermically and thus should be stored cold and used quickly. In the present work we consider the impa…
Abstract The purpose of this work is to evaluate a new polypropylene (PP)‐based nitroxyl radical generator (NOR) and offer comparisons with a commonly used peroxide in the production of controlled‐rheology polypropylene (CRPP) resins. CRPP resins are produced by reactive processing in a batch mixer by using different…
Abstract Summary: Chemical modification of polymer surface may potentially be used to create smart materials that can guide cellular adhesion, proliferation and maintenance of specific expression of molecules. The microbial polyester poly (3‐hydroxybutyrate) (PHB) has been attracted attention as promising material for…
Grating couplers with nanoscale periodicity have been fabricated on silicon-on-insulator (SOI) substrates by electron beam lithography and reactive ion etching. A versatile experimental apparatus has been implemented to measure the efficiency of these gratings in coupling free-space radiation into planar waveguides. T…
Enzymatic modification of polylactic acid fibers is investigated using various kinds of protease and lipase. The effects of enzymes on the hydrolysis of polylactic acid fibers is evaluated by means of fiber weight loss, fiber strength and fiber surface observation. It is found that proteases derived from Bacillus subt…
The photochemical behavior of (dibenzoylmethanato)boron difluoride in the polymethyl methacrylate matrix was studied. Photoinduced luminescence enhancement was observed, and a mechanism of the process related to the aggregation of high-polarity luminophore molecules under irradiation was suggested.
Layered double hydroxides (LDHs), anionic clays, have attracted increasing interest as nanovehicles for delivering genes, drugs, and bio-active molecules into cells. However, no attempts have been made to evaluate the potential undesirable effects of LDH nanoparticles. The cytotoxicity of LDHs with different chemical…
Crystal defects, especially dislocations, in hen egg-white lysozyme crystals that have multiple polymorphisms, for example, tetragonal, orthorhombic, monoclinic forms, etc., were investigated by means of synchrotron monochromatic-beam X-ray topography. The observed topographic images of dislocations were much clearer…
Erythropoietin (Epo) induces physiological activities such as cell proliferation, migration, and angiogenesis in Epo receptor (EpoR)-expressing vascular endothelial and tumor cells. Recently, it has been demonstrated that growth factor-independent proliferation is frequently observed during the cell transformation pro…