介观压电石英晶体等效电路的量子化

借鉴阻尼谐振子作量子力学处理的研究思想,将介观压电石英晶体等效电路量子化,在此基础上研究了真空态和压缩真空态下,各支路电流和电压的量子涨落. 关键词： 介观压电石英晶体 等效电路 阻尼谐振子 量子涨落     

Covalently Attached Monolayer of Phthalocyanine on Chemically Modified Silicon Oxide Surface

Highly stable monolayers of 2,9,16,23-tetracarboxyl phthalocyanine on 3-aminopropyl-triethoxysilane (ATS) modified silicon and quartz substrates were prepared by reaction of carboxyl and amine. The monolayers were characterized by UV-Vis spectra and AFM measurements. The results indicated that the ultra-thin films on silicon or quartz were smooth, and the ordered structures were observed in these films.     

透明KTN薄膜的PLD法制备及其铁电性能研究

用Sol Gel法制备KTN多晶粉末,在富氧气氛下烧结富钾KTN陶瓷,代替KTN单晶作为靶材,用PLD技术结合后期退火技术,在透明石英单晶(100)上制备出高取向的透明KTN薄膜,对薄膜厚度、折射率、伏～安(I～V)特性、介电特性进行了测试与分析.I～V特性表明,低电场强度下,I～V服从欧姆定律,高电场强度下,I～V服从平方关系,可用空间电荷限制电流模型解释.电容～测试电场频率(C～F)特性表明,低频电容色散大,高频色散小,10kHz时介电常数为12600.     

石英传像束的研制

主要介绍石英传像束的种类、制作工艺和测试结果，分析光纤长度和结构缺陷对其分辨率的影响     

Microgravimetric and voltammetric study of Zn underpotential deposition on platinum in alkaline medium

The microgravimetric and voltammetric responses of a polycrystalline Pt electrode in 0.1 mol L⁻¹ NaOH solution in the presence and the absence of 1.6 × 10⁻⁴ Zn²⁺, at 0.1 V s⁻¹ were analyzed. During the positive potential sweep, the water molecules are progressively substituted by OH⁻ ions, prior to PtO formation. The voltammetric charges obtained under the Zn_ads dissolution peaks suggest that 0.7 monolayers are deposited, with each Zn ad-atom occupying one active site and transferring two electrons. The total loss of mass due to the dissolution of the Zn ad-layer was 136.6 ng cm⁻² and the mass increase due to PtO formation was found to be only 12 ng cm⁻² less than the theoretical ones, 157.5 and 37.4 ng cm⁻², respectively, indicating that both processes are overlapped. In this way it is proposed that an adsorbed by-layer of Zn and OH⁻ ions is formed.     

Experimental determination of energy barrier to particle detachment

The estimation of energy barrier to detachment of particles from a substrate was carried out. Detachment processes of 4 m polyethylene particles from a quartz wall under the gravitational force in aqueous solutions were investigated by a direct observation technique. The magnitude of energy barriers was experimentally determined by the temperature dependence of the rate constant of detachment and was compared with that estimated theoretically from the superposition of electrostatic and London—van der Waals energies calculated using the experimental electrokinetic potentials and Hamaker constants, respectivley. Both were in fairly good agreement.     

Electrochemical Quartz Crystal Impedance Study of Glucose Oxidation on a Nickel Hydroxide Modified Au Electrode in Alkaline Solution

The electrochemical quartz crystal impedance (EQCI) technique has been applied to investigate glucose oxidation on bare and Ni(OH)₂‐modified Au electrodes in 0.2 mol L^?1 KOH aqueous solution. The EQCI responses suggest different contributions of H⁺‐release and OH^?‐incorporation reactions of the Ni(OH)₂‐film redox process in 0.2 mol L^?1 aqueous KOH at different potentials. Glucose adsorption on the Ni(OH)₂‐modified Au electrode was studied. A mechanism for potential cyclic redox process of glucose at Ni(OH)₂‐modified Au electrode is suggested, mainly based on a comparative EQCI analysis with direct glucose oxidation on bare gold and glucose ad‐/desorption on Ni(OH)₂ film.     

L-半胱氨酸自组装膜修饰金电极的电化学特性

采用电化学石英晶体微天平（EQCM）和循环伏安法（CV）研究了L-半胱氨酸在金电极表面形成自组装膜的机理及其电化学性质.结果表明, L-半胱氨酸分子在金电极表面有特性吸附，而且在等电点pH附近因静电引力和氢键作用形成分子对，从而自组装形成双层膜.该膜电极在0.2 mol•L－1的醋酸缓冲溶液中，于－0.2～0.5 V(vs SCE)间CV扫描出现了一对稳定的氧化还原峰，并对抗坏血酸的氧化有良好的催化作用.     

流动注射石英管原子吸收法测定微量总汞

建立了一套流动注射石英管原子吸收光谱法测定土壤、植物和药品等样品中微量Hg的方法，研究了酸度、载液和还原液流速及其浓度、氩气流量等条件对测定结果的影响。采用五氧化二钒、硝酸、硫酸进行消解，可获得可靠的分析结果。方法特征量为59pg，检出限为0.028μg/L；相对标准偏差为1.60%-3.86%；回收率为94％－102％。     

合成A型分子筛的矿物原料中石英的转化与活化

合成Ａ型分子筛的矿物原料中石英的转化与活化赵经贵，张斌，刘景茂，张新，霍丽华，陈耐生（黑龙江大学化学系哈尔滨１５００８０）（福州大学化学系福州）关键词　石英，高岭土，转化，活化，分子筛由高岭土、煤矸石合成Ａ型分子筛［１～３］，其中所含石英杂质影响分子...