Materials Literature
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Factors limiting the strain rate of superplastic deformation in ceramic materials are discussed on the basis of existing models and experimental results concerning high-temperature plastic deformation, intergranular cavitation and dynamic grain growth. From the discussion, it is indicated that simultaneously fulfillin…
A Si wafer and polysilicon deposited on a Si wafer were planarized using catalyst-referred etching (CARE). Two apparatuses were produced for local etching and for planarization. The local etching apparatus was used to planarize polysilicon and the planarization apparatus was used to planarize Si wafers. Platinum and h…
We present theoretical study on the electronic structures of the interfaces between Si substrate and SiO2 under zero bias and when a bias of −1.0 V is applied to the substrate by the first-principle calculation based on real-space finite-difference approach. By comparing the density of states at the interfaces, we stu…
The dinucleic octaethylporphyrin (OEP) derivatives described as OEP-(p-Phen)n-OEP (n=1–4) were synthesized, in each of which the porphyrin ring is spaced with p-phenylene group. Their electronic properties were studied, as compared with those of the corresponding dihexylbithiophene (DHBTh) derivatives with head-to-hea…
The formation of silicon dioxide (SiO2) layers at low temperatures (150–400 °C) by atmospheric pressure plasma oxidation of Si(0 0 1) wafers have been studied using a gas mixture containing He and O2. A 150 MHz very high frequency (VHF) power supply was used to generate high-density atomic oxygen in the atmospheric pr…
Numerically controlled local wet etching (NC-LWE) has been developed as a novel noncontact subaperture deterministic figuring method for fabricating ultraprecision optics or for finishing functional materials. In this method, a localized wet etching area is formed using a combined nozzle that is constructed by coaxial…
The effect of sintering temperature on the sinterability of synthesized nanocrystalline hydroxyapatite (HA) was investigated. The starting powder was synthesized via a novel wet chemical route. HA green compacts were prepared and sintered in atmospheric condition at various temperatures ranging from 900–1300 °C. The r…
AbstractNanotechnology has the potential to profoundly transform the nature of cancer diagnosis and cancer patient management in the future. Over the past decade, quantum dots (QDs) have become one of the fastest growing areas of research in nanotechnology. QDs are fluorescent semiconductor nanoparticles suitable for…
AbstractThe study reports some preliminary investigations on the template free synthesis of ascantlyinvestigated polyaniline (PANI) derivative—poly (1-naphthylamine) (PNA) by template free method in presence as well as absence of hydrochloric acid (HCl) (dopant), using ferric chloride as oxidant. The polymerization wa…
Abstract In framework of the adiabatic approximation the energy states of electron as well as direct light absorption are investigated in strongly oblate and strongly prolate ellipsoidal quantum dots (QDs) at presence of electric and magnetic fields. Analytical expressions for particle energy spectrum are obtained. Th…
AbstractMicrotubules are filamentous proteins that act as a substrate for the translocation of motor proteins. As such, they may be envisioned as a scaffold for the self-assembly of functional materials and devices. Physisorption, self-assembly and combing are here investigated as a potential prelude to microtubule-te…
AbstractPolyethylene oxide –b– polypropylene oxide -b- polyethylene oxide (EO106PO70EO106) block copolymer self-organizes into polymeric supramolecules, characterized by NMR as phase transition from the isotropic stack-up block structure to the ordered cubic polymeric supramolecular structure. Its dependence on both t…
AbstractWe report on progress in growth and applications of submonolayer (SML) quantum dots (QDs) in high-speed vertical-cavity surface-emitting lasers (VCSELs). SML deposition enables controlled formation of high density QD arrays with good size and shape uniformity. Further increase in excitonic absorption and gain…
AbstractEvaporation of fluid at micro and nanometer scale may be used to self-assemble nanometre-sized particles in suspension. Evaporating process can be used to gently control flow in micro and nanofluidics, thus providing a potential mean to design a fine pattern onto a surface or to functionalize a nanoprobe tip.…
AbstractBio-nanopatterning of surfaces is a very active interdisciplinary field of research at the interface between biotechnology and nanotechnology. Precise patterning of biomolecules on surfaces with nanometre resolution has great potential in many medical and biological applications ranging from molecular diagnost…
A new preparation route to the intermetallic clathrate-I compound Na2Ba6Si46 is introduced, which allows one to make large amounts of product with standard laboratory equipment. The precursor Na2BaSi4 is oxidized with gaseous HCl at 673 K to Na2Ba6Si46, NaCl and BaCl2. Full-profile refinement of the crystal structure…
The potential positive and negative effects of nanotechnology on the environment are discussed. Advances in nanotechnology may be able to provide more sensitive detection systems for air and water quality monitoring, allowing the simultaneous measurement of multiple parameters and real time response capability. Metal…
A formulation of nonlocal plasticity with kinematic and isotropic hardening is presented. The treatment is developed within the framework of an internal variable model. The nonlocal variables are defined as a weighted average of the corresponding local ones over all the material points in a representative volume cente…
This article presents the results of the research in the area of the possibilities of the utillisation of the natural zeolite from the locality Ni ný Hrabovec at reduction of combustion engines toxical gases. The combustion engines produce a lot of toxical emissions. There is an increased interest to utilize zeolites…
29 种(24 个类， 6 个家庭) 在东北典型、普通的蝴蝶，中国被选择借助于扫描电子显微镜学和接触角测量系统在模式， hydrophobicity 和 hydrophobicity 机制上做质、量的研究。规模表面由 submicro 班组成垂直凸圆和水平连接。规模的距离是 48—91 渭 m，长度 65—150 渭 m，和宽度 35—70 渭 m。submicro 班的 Thedistance 规模上的垂直凸圆是 1.06—2.74 渭 m，高度 200—900 nm，和宽度 200—840 nm。蝴蝶翅膀的表面上的更好的 hydrophobicity (静态的接触 angle136.3 掳—156.6 °) 被贡献微班的规模和…