Proton radiation effects on optical constants of Al film reflector

The Al film reflectors can yield a high-reflectance over a broad wavelength region, and have been widely used in the spacecraft optical instruments for high quality optical applications. Under the irradiation of charged particles in the Earth radiation belt, the reflectors could be deteriorated. In order to reveal the deterioration mechanism, the change in optical constants of Al film reflector induced by proton radiation with 60\,keV was studied in an environment of vacuum with heat sink. Experimental results showed that when the radiation damage primarily occurs in the Al reflecting film, the extinction coefficient k will gradually decrease with increasing radiation fluence, which results in the decrease of the energies of reflective light. Therefore, the proton radiation induced an obvious degradation of spectral reflectance in the wavelength region from 200 to 800\,nm on the Al film reflector.     

纳米级β-Ni(OH)2掺杂Al(OH)3的电化学性能

钠米粉体;纳米级β-Ni(OH)2掺杂Al(OH)3的电化学性能     

碳钢在N-甲基二乙醇胺介质中的电化学阻抗谱研究

应用电化学阻抗谱(EIS)研究碳钢在N-甲基二乙醇胺(MDEA)介质中的腐蚀行为.实验表明,未经预阴极活化处理的碳钢表面存在氧化膜,溶解氧促使它腐蚀速率增大,经活化处理去除氧化膜后则相反.在不含热稳定性盐(HSS)的MDEA溶液中,碳钢的腐蚀性随MDEA浓度的增加呈先上升后下降趋势;而在HSS高含量的溶液中,其腐蚀性则随MDEA浓度的增加而单调下降.在含有HSS模拟溶液中,碳钢的阳极极化EIS随极化电位由低到高分别出现感抗、负阻抗以及Warburg阻抗响应等特征,对应于孔蚀、活化状态向钝化状态过渡以及进入钝化的趋势,腐蚀反应的阴极过程表现为电化学反应和扩散传质混合控制,阳极过程为电化学反应控制.     

Structure and Bonding in BAlH5 (B: Be,Ca, Sr) from First‐Principle Calculations.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.     

Superatom Compounds,Clusters, and Assemblies: Ultra Alkali Motifs and Architectures.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.     

Ca0.6Mg0.4Zr4(PO4)6涂层改善堇青石陶瓷

本文采用溶胶-凝胶法和浸渍涂覆技术在致密堇青石陶瓷表面制备了Ca0.6Mg0.4Zr4(PO4)6(C0.6M0.4ZP) 涂层,采用XRD、SEM等分析手段研究了涂层的相组成和微观结构,并通过分别测定涂覆和未涂覆涂层试样在1000℃下受腐蚀后的质量损失和强度变化,对涂层的耐碱腐蚀性能进行了表征.结果表明,在堇青石表面制备的涂层均匀致密,由单相的C0.6M0.4ZP组成.SEM分析表明涂层与堇青石基体间结合良好.C0.6M0.4ZP涂层具有较好的耐碱腐蚀性能,可显著提高堇青石陶瓷的高温耐碱腐蚀性能.     

Al2O3-ZrO2-YAG复相粉末的低温合成研究

用低温原位合成技术制备了Al2O3-ZrO2-YAG复相粉末,在1100℃,5h热处理后,Al-Zr-Y-O体系中的主相为ZrO2四方相,其余为无定形相,表明ZrO2抑制了Al2O3和YAG晶粒的生长,同时Al2O3和YAG抑制了ZrO2从四方相向单斜相的转变.在1580℃,1h热处理后,Al-Zr-Y-O体系中的复相组成为(115+90x)Al2O3+54(Y2O3)x·ZrO2+(32-36x)YAG,其中0 ≤x＜0.88(mol).     

PET上沉积Al掺杂ZnO薄膜的光电特性研究

采用脉冲激光沉积技术(PLD),室温下在柔性衬底PET上制备了高度c轴择优取向的Al掺杂ZnO薄膜.XRD分析表明,不同Al掺杂浓度的样品均呈现单一的ZnO相.荧光光谱和透射光谱分析显示,低温低氧压下制备的Al掺杂ZnO薄膜在紫光区域有很强的荧光发射,在可见光区域具有较高的透射率;并且可以通过Al掺杂浓度调节薄膜紫色发光强度和薄膜带隙.薄膜的电阻率随着Al掺杂浓度的增加先降低后增加,在掺杂浓度为3;原子分数时达到最小值.     

水性环氧铝粉涂层/碳钢体系的腐蚀电化学行为

应用电化学阻抗谱(EIS)和扫描振动电极技术(SVET)研究了碳钢基体上含人造缺陷的水性环氧铝粉涂层浸泡在3.5%NaCl溶液中的腐蚀电化学行为.结果表明,浸泡初期,涂层缺陷处为阳极活性区,涂层阻抗随时间延长逐渐降低,活性区逐渐扩展;之后,由于腐蚀产物的自修复作用使整个涂层/金属界面电化学反应活性降低,导致涂层阻抗快速增加.浸泡后期,由于腐蚀介质渗入到涂层/基体界面,出现了更多的阳极活性区,涂层产生破坏剥离.     

横向加热石墨炉原子吸收法测定儿童血液和头发中的铅和铝

采用横向加热石墨炉原子吸收法测定儿童血液和头发中的铅和铝,以磷酸二氢铵和硝酸镁或硝酸镁作基体改进剂,提高了测定铅的灰化温度和灵敏度,消除了基体干扰和记忆效应。方法简便、快速、准确度高。铅和铝的特征量分别为：2.3×10-11 g和2.2×10-11 g,相对标准偏差为3.0%～11.4%,回收率为96%～110%。