Materials Literature
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polyacrylonitrile (平底锅) 在稳定上在稳定和进一步的效果以前在他们的变丑期间锁住的共聚物的取向详细被调查。当变丑比率到达约 1.07 时，结果表明平底锅链的取向介绍 69.51% 的一个浸透点，同时，环合而非氧化在稳定期间在平底锅链的取向上有更强壮的依赖。环合被便于当激活精力在浸透点前作为平底锅纤维的发展中的取向的后果显然正在减少时，环合度正在增加；然而，它在点以后在平底锅纤维的进一步的变丑期间被制止。从在浸透点准备的 PAN 纤维获得的产生的碳纤维在张力的模量在张力的力量和 249.0 GPa 拥有 4.07 GPa 的最高机械的性质。
一系列 Si 富有的非结晶的硅碳化物(一 -- 原文如此: H ) 薄电影在常规血浆被扔有各种各样的煤气的比率 R = 的提高的化学蒸汽免职系统[CH4 ]/[SiH4 ] 。微结构，同样扔的电影的光、电子的性质在这研究被调查。光乐队差距与在这些电影的碳内容线性地成正比，它能被改变煤气的比率在 1.82.4 eV 的一个范围控制，这被发现， R。在房间温度的黑暗和相片传导性与在与 1.96 eV 的光乐队差距为这部电影象 104 一样高到达的电影，和光敏度增加碳内容被减少。同样扔的样品随后在 900 楴敶戠慲据 ? 眠 ? 牰獥湥整 ? 桴 ? 汣獯摥昭牯 ? 硥牰獥楳湯 ? 潦 ? 灯楴慭? 牴湡浳瑩楴杮瀠睯牥 ? 的温度被退火…
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A zinc tetraaminophthalocyanine derivative,zinc tetra(methacryloyl moiety)aminophthalocyanine(MeZnAPc)(with a double bond) was synthesized by the reaction between zinc tetraaminophthalocyanine(ZnTAPc) and methacryloyl chloride.Atom transfer radical polymerization(ATRP) was employed as the polymerization technique to o…
有不同 Zn/Al/La 臼齿的比率的 ZnAlLa-CO3 分层的双氢氧化物(LDH ) 被经常的 pH 一起沉淀方法准备。合成材料被 X 光检查衍射(XRD ) 描绘， Fourier 变换红外线的光谱学(FTIR ) ，扫描电子显微镜学(SEM ) ， Brunauer-Emmett-Teller 方法(赌注) 和粒子分析。结果证明象 hydrotalcite 一样材料有分层的结构。stabilizers 与 PVC 树脂被混合的 ZnAlLa-CO3-LDHs。为 PVC composites 的热变老的、集体损失测试和刚果红的测试在 180 点被执行吗？？
Abstract: Ceramic porous MgTiO 3 materials have been prepared by classical solid-state route. The sintering of ceramic samples with different LiF contents was studied using dilatometric, thermogravimetric, X-ray diffraction and microstructural analysis. The investigations results showed that the microstructure and por…
We investigate the electronic transport properties of atomic carbon chain-graphene junctions by using the density-functional theory combining with the non-equilibrium Green's functions.The results show that the transport properties are sensitively dependent on the contact geometry of carbon chain.From the calculated I…
首先制备了五种聚醚胺改性蒙脱土(MMT), 并将这五种聚醚胺改性蒙脱土加入到双酚A 型环氧树脂E51 和聚醚胺D400体系中, 采用差示扫描量热法(DSC)考察了五种聚醚胺改性MMT对环氧树脂升温固化进程的影响. 随后, 优选一种EP/MMT 混合体系即EP/D400-T500-MMT 混合体系, 系统地研究了该体系与纯环氧树脂体系在130, 140, 150 及160 ℃等几个温度下的等温固化过程, 考察了等温固化时间对固化度和固化度变化速率的影响以及固化度与固化度变化速率之间的关系, 并利用Kamal 模型进行拟合计算了固化动力学参数. 研究结果表明, 与纯环氧树脂相比, 几种聚醚胺改性MMT 的固化放热峰均向高温迁移, 同时…
Atomic Force Microscopy (AFM) and infrared (IR) spectroscopy have been combined in a single instrument capable of producing 100 nm spatial resolution IR spectra and images. This new capability enables the spectroscopic characterization of biomaterial domains at levels not previously possible. A tunable IR laser source…
The thiophene removal ability of the synthesized ZnNi/diatomite-pseudo-boehmite adsorbent was tested in a labscale fixed-bed reaction system.X-ray diffractograms(XRD) were used to characterize the adsorbent samples.The effects of Zn/Ni molar ratio,various model fuels and regeneration patterns on the RADS tests were st…
In the middle of last century, some scientists discovered grain-boundary anelastic relaxation (GAR) peaks by means of torsional pendulum. Later, various models about the origin of GAR peaks are established through further research. However, its micro-mechanism is still unclear. Recently, according to the results of so…
Thermal conductivity is one of the most important physical properties of thin films. Different from two- or three-dimensional measurement structures in most reports, in this work, one-dimensional (1D) two-end supported cantilever beam is provided. The structure of cantilever includes a metal heater (which also serves…
Regarding ferromagnetic resonance frequency as a function of the perpendicular external magnetic field, the ferromagnetic resonance phenomenon is investigated. The results show that for the case where the external magnetic field is parallel to the its plane and the magnetic thin film has a perpendicular uniaxial magne…
Quality properties and internal defects of unintentionally doped GaN films grown on 0.3 vicinal sapphire (0001) substrates by MOCVD are investigated by TEM. The results show that plenty of dislocations in the GaN films prepared on vicinal sapphire substrates are annihilated in the areas with a distance of 0.8 m away f…
At pressure 5.0-5.7 GPa and temperature 1250-1600 ℃, the conditions of synthesis Gem-diamond are reported using FeNiMnCo catalyst by temperature gradient method (TGM), and the P-T phase diagram is given. Temperature field and carbon concentration gradient are simulated based on finite element method (FEM). The results…
The magnetic properties of the Fe-based nanocrystalline alloys are determined mainly by their grain sizes, and the mechanism of the variation of grain size with annealing temperature is an important issue in the study of nanocrystalline alloys. In this paper, the relationships between grain size and annealing temperat…
Taking advantage of the glowing discharge technology and plasma mass spectrometry diagnosis technology, the variation rules of positive ion species and energy with power in H2/C4H8 mixture gas are investigated. The characteristic ions are measured and their forming process is discussed. The results show that the inten…
Ga-doped ZnO nanostructures with various doping concentrations are prepared by using carbon thermal reduction reaction and in situ doping method. X-ray diffraction measurement reveals only wurzite structures existing in Ga-doped ZnO nanostructures. Scaning electron microscopy observations show that with the increase o…
In this paper, according to the principle of grain refining and semisolid forming by cooling sloping plate process, the distributions of boundary layers during melt treatment by the sloping plate are studied, and mathematic models of heat transfer and cooling rate are established. Calculation results show that the cha…
Elliptic paraboloid model is established, and three-dimensional finite-difference time-domain method has been employed to simulate the field distribution of discontinuous crack with different shapes and positions in fused silica output subsurface under 355 nm laser incidence. Results show that both electric field inte…