Materials Literature
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배향된 상태에서 복굴절이 없는 zero-<TEX>${\Delta}$</TEX>n 재료를 개발할 목적으로 용융혼합된 폴리락타이드(PLLA, (+)복굴절)/폴리(메틸 메타크릴레이트)(PMMA, (-)복굴절) 블렌드의 상용성과 PMMA의 공단량체인 메틸 아크릴레이트(MA)가 PLLA와의 상용성에 미치는 영향을 살펴보았다. MA 함량에 상관없이 모든 블렌드에서 조성에 따라 변하는 단일 <TEX>$T_g$</TEX>와 90% 이상의 투명도가 관찰되었으며, 이로부터 용융혼합된 PLLA/PMMA 블렌드는 분자수준에서 상용성을 보임을 확인하였다. 이들 블렌드는 <TEX>$280^…
Theoretical understanding of the stability, ferromagnetism, and spin polarization of Mn5Ge3 clusters has been performed by using the density functional theory with generalized gradient approximation for exchange and correlation. The magnetic moments and magnetic anisotropy energy (MAE) have been calculated for both bu…
Abstract The reactions of Bi(NO 3 ) 3 · 5H 2 O or Sm(NO 3 ) 3 · 6H 2 O with oleum (65 % SO 3 in conc. H 2 SO 4 ) and the pyridine (Py) complex Py · SO 3 in the ionic liquid 1‐butyl‐3‐methylimidazolium hydrogen sulfate, [bmim][HSO 4 ], yielded single crystals of (C 5 H 6 N)Bi(S 2 O 7 ) 2 and (C 5 H 6 N) 3 Sm(S 2 O 7 )…
Abstract Anisometrische SiO 2 ‐Suprapartikel werden durch einfache Verdunstung einer Dispersion von pyrogenem Siliciumdioxid in Wassertropfen auf einer superhydrophoben Oberfläche erhalten. Die Form der Suprapartikel wird unmittelbar durch die Salzkonzentration (NaCl) kontrolliert. Oberhalb einer Grenzkonzentration we…
Abstract From Fe 3 Si/FeSi 2 artificial lattices, wherein Fe 3 Si layers are partially epitaxially grown from the first layer on Si(111) up to the top layer across the FeSi 2 layers with the same orientation relationship as that in the first layer, current‐perpendicular‐to‐plane (CPP) structures that partially contain…
A small amount of high molecular weight molecules can have a dramatic influence on the flow‐induced crystallization kinetics and orientation of polymers. To elucidate the effects of the high molecular weight component under a real processing process, we prepared model blends in which high density polyethylene with a h…
You might think all glasses are the same—that they are all viscous amorphous materials somewhere between solids and liquids. In fact, many glass-forming liquids fall into two categories: “strong” and “fragile.” As the temperature T is reduced, the viscosity of strong glasses like SiO2 increases as exp(∆/T ), where ∆ c…
This work investigates the symmetry properties of single-wall carbon nanotubes and their structural analogs, which are nanotubes consisting of different kinds of atoms. The symmetry group of a nanotube is studied by looking at symmetries and color fixing symmetries associated with a coloring of the tiling by hexagons…
The dynamics of two- and five-disk systems confined in a square has been studied using molecular dynamics simulations and compared with the predictions of transition state theory. We determine the partition functions Z and Z(‡) of transition state theory using a procedure first used by Salsburg and Wood for the pressu…
Material models are widely used in finite element codes for analysis of material deformations particularly at high strain rates and elevated temperatures. The problems such as necking and bulging limit the conventional test techniques to measure the stress–strain curves only up to small strains. This is while in some…
This paper describes a facile approach to a biomimetic rapid fabrication of ultrathin silica nanotubes with a highly uniform diameter of 10 nm and inner hollow of around 3 nm. The synthesis is carried out through a spontaneous polycondensation of alkoxysilane on polyamine crystalline fibrils that were conveniently pro…
Fluorine-doped tin oxide (FTO) films with a thickness of about 3 micrometers were prepared by electron cyclotron resonance-metal organic chemical vapor deposition (ECR-MOCVD) under 800 W of microwave power, with tetra-methyl tin (TMT) as a tin precursor. The dome-shaped micro-patterned FTO layer was prepared on a copp…
The band profile and electronic properties of Zn-polar ZnMgO/ZnO heterostructures are investigated using self-consistent calculations of the Schrödinger, Poisson, and charge balance equations for 300 K, all based on the assumption that the two-dimensional electron gas (2DEG) originates from donor-like surface states o…
Abstract Novel degradable biomedical materials are found to have huge potential applications in fields such as drug delivery and release, orthopedic fixation support and tissue engineering. Utilization of polymers as biomaterials has greatly impacted the advancement of modern medicine. In this review, some new degrada…
Gold Nanoparticles successfully applied for detection of Chlorpyrifos pesticide present in various water samples. Structural and morphological studies of Gold Nanoparticles were studied following UV-Visible Spectrophotometer, SEM and HRTEM. Trisodium Citrate has been used as a reducing agent. The author successfully a…
A reversible vapochemical and mechanochemical solid-state transformation between a dppe-linked SFe3Cu2-based cluster [{(μ3-S)Fe3(CO)9}Cu2(dppe)] (2) and its 1D polymer [{(μ4-S)Fe3(CO)9}Cu2(dppe)(MeCN)2]n (3) was demonstrated, in which polymer 3 exhibited semi-conducting properties with an energy gap of 1.69 eV.
Nanotechnology is the study of the controlling of matter on an atomic and molecular scale. Generally nanotechnology deals with structures of the size 100 nanometers or smaller in at least one dimension, structural features are intermediate in between isolated atoms and bulk materials, in the range of 10 -9 to 10 -10 m…
Current saturation in graphene field-effect transistor (GFET) is of significant importance to improve the maximum oscillation frequency (fmax). We investigated the direct current (dc) and radio frequency (rf) characteristics of a heavily p-type doped GFET based on chemical vapor deposition grown material. The drain cu…
In 2006, the overwhelming majority of radiologists including myself were shocked by the news that a contrast agent, that most of us believed was very safe, could cause nephrogenic systemic fibrosis (NSF). NSF is a delayed adverse contrast reaction which may cause severe disability and even death. Within two years, it…
The dynamic properties of the dipolar magnet CsGd(MoO4)2 have been studied. The frequency and temperature dependence of the AC susceptibility investigated in the paramagnetic region above 2 K revealed the co-existence of magnetic field induced slow and fast relaxation channels with a timescale differing by three order…