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。
In this paper, highly uniform and well-dispersed CaF2 microsphere with tunable particles size have been successfully synthesized by a facile hydrothermal process using ethylenediaminetetraacetic acid disodium as a complexing reagent. The XRD results indicated that the as-prepared microspheres were of cubic phases and…
Gold nanoparticles (Au NPs) with diameters ranging between 15 and 150 nm have been synthesised in water. 15 and 30 nm Au NPs were obtained by the Turkevich and Frens method using sodium citrate as both a reducing and stabilising agent at high temperature (Au NPs-citrate), while 60, 90 and 150 nm Au NPs were formed usi…
In this study, Tb3+-doped Y2O3 green nanospheres were prepared via the simple, cost-effective urea homogeneous precipitation method without additives. The specimens annealed above 800° C are well matched with the cubic phase (JCPDS, 41-1105), and the crystallinity increases with raising the annealing temperature. All…
New design models of walls with products of modifi ed fi bers in present conditions of design and operation according with new requirements of building regulations in the light of saving energy resources are viewed. Theory and results of heating calculation of construction fences are provided.
以Ti、B4C和Fe粉为原料，采用等离子束加热反应合成TiB2-TiC-Fe2Ti复合材料，分析了其物相、组织结构、显微硬度和断口形貌等。结果表明：反应生成物中物相主要有TiB2、TiC和Fe2Ti，同时含有少量的Fe3C。各物相以不同的形态均匀分布，TiB2呈现六边形和长条形，TiC近似球形，Fe2Ti作为粘结相存在于TiB2和TiC相之间，促进了各相之间的结合。等离子束加热具有高加热及冷却速率，降低了晶粒生长时间，有利于获得细小的组织。随着电流增加，单位时间内输入坯体热量增多，TiB2和TiC充分长大，各相之间结合更加紧密。
Objectives: This study compares wearing time for four months after receiving a new spectacle correction in subjects within Autism Spectrum Disorder (ASD) population to typically developing (TD) children and adolescents age 9 to 17 years old. Methods: Children and adolescents who were ASD or TD were enrolled from subje…
研究大豆分离蛋白-葡聚糖共价复合物(soy protein isolate-dextran grafted conjugates,SPI-g-DEXT)对大豆分离蛋白(soy protein isolate,SPI)与葡聚糖(dextran,DEXT)溶液共混物相行为及微结构形貌的影响。结果表明:添加SPI-g-DEXT的接枝率为49.92%时,共混溶液表观黏度、黏弹模量、宏观相分离时间及形貌结构中多糖相分散度随添加量(0、0.10、0.20、0.30 g/100 mL)增加而呈先增加后降低趋势。SPI-g-DEXT添加量为0.20 g/100 mL时,共混溶液相容性随其接枝度(0%、30.73%、49.92%、62.84%)增加…
目前,将天然高分子蛋白和聚合物共混利用静电纺丝法制作各种组织工程支架材料倍受关注。基于这种研究背景,在本文中利用静电纺丝技术,制备了丝素(SF)/胶原(COL)/聚左旋乳酸(PLLA)和SF/COL/聚左旋乳酸-己内酯(PLCL)两种共混复合纤维膜,通过扫描电镜(SEM)对纤维形态结构分析,发现复合纤维形貌良好,直径较为均一。同时改变纺丝液中高分子蛋白的比例,复合纤维的直径也随之减小。此外,对复合纤维进行了力学性能测试,发现随着聚合物含量的增加,复合纤维膜的力学性能得以改善,SF/COL/PLCL组复合纤维的拉伸性能明显优于SF/COL/PLLA组。
分别以2种不同聚合度的聚乙二醇（PEG）PEG600和PEG2000为模板导向剂，采用水热法合成η-Al2O3（PEG600）和η-Al2O3（PEG2000）介孔纤维，借助XRD、TEM和N2吸附测试对材料进行表征，研究了PEG聚合度对介孔η-Al2O3纤维性质的影响。通过静态吸附平衡实验考察了介孔η-Al2O3纤维对亚甲基蓝的吸附特性。结果表明：2种模板导向剂均可用于合成介孔η-Al2O3纤维。PEG聚合度对介孔结构、比表面积、孔体积和孔径有较大影响。η-Al2O3（PEG600）的比表面积和孔体积分别为189.899 m2·g-1和0.329 cm3·g-1，分别是η-Al2O3（PEG2000）的1.4倍和1.2倍，平均孔…
为了研究国产2D-SiC/SiC复合材料的拉伸损伤行为以及低周循环载荷作用下的力学性能，通过试验和建立加卸载细观力学模型，对其拉伸加卸载行为进行了探讨。建立了单向连续纤维增强陶瓷基复合材料加卸载细观力学模型，得到了初始加载、卸载和重新加载时的应力-应变关系；利用断裂统计方法得到了基体裂纹数随应力变化的关系和复合材料失效判断条件。经过应力转化，将该模型应用于国产二维编织SiC/SiC复合材料。对单向加载试件，采用正交试验方法和最小二乘法得到基体Weibull模量和界面剪切阻力，通过控制材料失效强度与试验结果一致，得到纤维Weibull模量。由上述参数确定的2D-SiC/SiC复合材料拉伸循环加卸载应力-应变曲线与实测曲线吻合很好。通…
通过机械分散技术制备了纳米Al2O3 /环氧、酚酞聚芳醚酮/环氧和纳米Al2O3/ 酚酞聚芳醚酮/环氧复合材料，并对比研究了其拉伸模量、拉伸强度、断裂性能和热性能。结果表明：纳米Al2O3及酚酞聚芳醚酮在环氧树脂中呈均匀的分散状态；纳米Al2O3使环氧树脂拉伸模量增加，使拉伸强度先增后降；酚酞聚芳醚酮使环氧树脂拉伸模量略微下降，对拉伸强度影响不明显；纳米Al2O3/酚酞聚芳醚酮/环氧三元复配体系的拉伸模量和拉伸强度呈非单调变化的趋势；纳米Al2O3和酚酞聚芳醚酮对环氧树脂均有增韧作用，三元复配体系增韧效果更明显，表现出协同增韧效果；高含量纳米Al2O3降低了环氧树脂的初始分解温度，而其余填料对环氧树脂热稳定性具有改善作用，填料均使…
纳米二氧化锰（MnO2）作为超级电容材料已被广泛研究。为了改善其充放电性能，采用原位化学氧化聚合法制备聚噻吩/纳米MnO2 （PTh/MnO2）复合材料，对纳米MnO2进行性能改性。通过改变聚噻吩在PTh/MnO2复合材料中的掺杂量，制备出一系列的复合材料。采用傅里叶转换红外光谱（FIIR）、X射线衍射仪（XRD）、场发射扫描电子显微镜（FE-SEM）和透射电子显微镜（TEM）对PTh/MnO2复合材料的化学性能、晶体结构以及表面形貌等进行了详细考察。接着采用CT001A型电池测试系统对以PTh/MnO2复合材料做负极所制得的密封扣式电池进行了充放电性能测试。结果表明，MnO2和聚噻吩在不同的PTh/MnO2复合材料中形貌各异。当…
Introduced by Albertson et al. \cite{albertson}, the distinguishing number $D(G)$ of a graph $G$ is the least integer $r$ such that there is a $r$-labeling of the vertices of $G$ that is not preserved by any nontrivial automorphism of $G$. Most of graphs studied in literature have 2 as a distinguishing number value ex…
The coating on the surface of metals and alloys is used to increase strength and durability of materials. There are many different technological schemes of this process. It is of interest to use the explosion energy to create a stream of particles deposited on the surface of metals. The article is based on a simple ph…
This presentation shows new generation single-layered ceramic capacitors that are developed using novel colossal dielectric perimittivity materials. The new capacitor uses a single-layer instead of the current multi-layered structure used in X-series and
A number of works are dedicated to the investigation of the effects of the excluded volume interactions on the dynamics of cyclic polymers in good solvents using the Yu-Fujita model. Unfortunately, this latter does not satisfy the circularity condition. To overcome this problem, use is made of the Bensafi-Benmouna mod…
The objective of this study is to illustrate the effect of two types of heat treatment on microstructure and mechanical properties of C102 copper alloy. Annealing and quenching were conducted to study the effect of cooling rate on material. Specimens were heated at 350, 400 and 500oC and were cooled by using two types…
Purpose. Ground waters flowing through the soil could leach different salts and gases. As a result these waters obtain the ability to destroy cement solutions (cause the corrosion of cement stone). Prediction of the construction destruction in this case is a problem of great interest. The goal of this paper is the dev…
This work involves the manufacturing of MAX phase materials include V 2 AlC and Cr 2 AlC using powder metallurgy as a new class of materials which characterized by regular crystals in lattice. Corrosion behavior of these materials was investigates by Potentiostat to estimate corrosion resistance in 0.01N of NaCl at fo…
Currently, CFRP composites are rapidly replacing steel plates, as they are lighter, stronger, and more elastic; however, they are poorly suited to hygrothermal and impact-collapsed environments because moisture can alter their molecule arrangement and chemical properties. In this study, environments are experimentally…