共查询到20条相似文献,搜索用时 125 毫秒
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负载型SiO2无机膜的制备与表征 总被引:1,自引:0,他引:1
采用Sol-Gel法制备负载型SiO_2无机膜,考察了有机粘结剂、处理温度对膜性能和结构的影响,并用SEM、XRD、孔分布和渗透性测定等方法对无机膜进行了表征。 相似文献
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聚电解质多层有序膜电极的生成及其电化学特性 总被引:2,自引:1,他引:2
研究了在金电极表面硫醇自组装膜上聚电解质多层有序膜的形成过程及其电化学特性。用紫外光谱和电化学方法对多层有序膜进行了表征。结果表明,有序膜影响着离子在膜中的穿透性,离子型电活性物质如铁氰根离子和亚甲蓝等可嵌入有序膜中,研究了多层有序膜电极的电化学特性及膜中铁氰根离子的电化学行为。 相似文献
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沈应中 Marion Leschke Stefan E. Schulz Ramona Ecke Thomas Gessner Heinrich Lang 《无机化学学报》2004,20(11):1257-1264
合成了一系列三正丁基膦辅助配体稳定的铜(Ⅰ)β-二酮配合物,对合成的配合物用元素分析、红外、核磁共振以及热重和差热等手段进行了表征。筛选出性能优良的配合物为前驱物用化学汽相沉积(CVD)的方法生长出金属铜膜,用SEM和EDX等手段对生长的铜膜进行了表征。 相似文献
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沸石膜的合成、表征与应用 总被引:3,自引:0,他引:3
综述了沸石膜的合成、表征及应用。沸石膜合成最常用的方法为水热合成法,并相继发展了二次生长和微波合成法。XRD、SEM、EPMA及气体渗透为表征沸石膜常用的手段。沸石膜在分离、膜反应、催化及光学材料等方面具有广阔的应用前景。最后对沸石膜的发展进行了展望。 相似文献
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自组装超分子膜修饰电极的研制及分析应用 总被引:4,自引:0,他引:4
阐述了自组装超分子膜修饰电极的发展概况及超分子体系形成的理论基础,并对自组装超分子膜修饰电极的特点、电化学行为、功能膜的制备和表征方法以及它在电催化、生物传感器、离子选择性电极等方面的应用进行了综述。 相似文献
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Charmian J. OConnor Terenece D. Lomax Robyn E. Ramage 《Advances in colloid and interface science》1984,20(1):21-97
The aqueous micelle model and its relation to the various models proposed for aggregation of surfactants in nonaqueous solvents, and the controversy surrounding the applicability of the critical micelle concentration to these aggregates, have been discussed. The effect of the addition of water to, and the nature of acid-base interactions in, surfactants solutions in apolar solvents have been included in a review of the kinetics of the reactivity of esters and other organic sustrates, inoragatic reaction mechanisms, catalysis by solubilized enzymes and electron and proton transfer reactions in these media. Where possible, analogies have been made with membrance mediated processes. 相似文献
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胎儿和儿童骨中稀土元素与微量元素分析及其生物信息 总被引:3,自引:0,他引:3
中子活化法分析了多例胎儿骨,儿童骨和猪脚骨中稀土元素,ICP-AES分析了多例胎儿骨中微量元素并讨论了稀土元素透过胎盘屏障进入胎儿人和儿童进行中的累积情况。 相似文献
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Abstract The gas permeability and an oxygen to nitrogen selectivity was determined with some poly (organophosphazenes). It is found from the data that the membrance having the highest gas permeability was [NP(NHPrn) (NHEt)]n, and had 1.5x10?6 cm3. cm/cm3 sec.cmHg to oxgen or 2.2x10?6cm3.cm/cm3.sec.cm.Hg to nitrogen. On the other hand, the membrance having the highest oxgen to nitrogen selectivity of about 3, had the formular of [NP(OC6H4Cl-p)2]n. Also, the selectivity does not depend on the glass transition temperature of the membrances. The membrance prepared from [NP(OC6H4CH3-p)2]n has a negative activation energy to oxgen and nitrogen permeability. 相似文献
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一类新型仿生分析试剂的制备--分子模板技术的研究进展 总被引:2,自引:0,他引:2
评述了一类新型仿生分析试剂--分子模板聚合物的系列制备方法.该方法称为分子模板技术,包括封管聚合、原位聚合、悬浮聚合、两步溶胀和聚合联用以及膜技术,指出了该技术的研究目标和应用前景. 相似文献
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人体胃癌组织中含铁络合物的ESR谱 总被引:1,自引:0,他引:1
人体胃癌组织中含铁络合物的ESR谱郑莹光,王萍,于小林,赵吉生(吉林大学分析测试中心,长春,130023)(白求恩医科大学第三临床医院)关键词胃癌组织,ESR,铁络合物ESR技术已广泛用于生物体内自由基的研究[1,2]但用来直接检测人体癌变组织中金属... 相似文献
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A new system is described for the study of protoporphyrin-induced photodamage of cells. This system differs from those previously described in that fibroblasts are induced to synthesize protoporphyrin from its precursor δ-aminolevulinic acid.
Fibroblasts were cultured from skin biopsies of 6 normal individuals and 6 patients with protoporphyria. All cell lines in both groups accumulated protoporphyrin when incubated with δ-aminolevulinic acid in the absence of iron. Irradiation for 2 min with long-wave UV light caused death of cells which had accumulated protoporphyrin, but not of cells which had been incubated without δ-aminolevulinic acid. Cell damage could be quantitatively assessed by the release of chromium-51 into the medium.
Examination of irradiated protoporphyrin-rich fibroblasts by electron microscopy revealed no significant differences between lines from patients with protoporphyria and normal individuals. The earliest indications of photodamage were rarifaction of the mitochondrial matrix with dilatation of cristae. dilatation of endoplasmic reticulum, and loss of plasma membrance integrity. Condensation of the cells correlated with cell death. These structural alterations suggest a generalized cellular injury. 相似文献
Fibroblasts were cultured from skin biopsies of 6 normal individuals and 6 patients with protoporphyria. All cell lines in both groups accumulated protoporphyrin when incubated with δ-aminolevulinic acid in the absence of iron. Irradiation for 2 min with long-wave UV light caused death of cells which had accumulated protoporphyrin, but not of cells which had been incubated without δ-aminolevulinic acid. Cell damage could be quantitatively assessed by the release of chromium-51 into the medium.
Examination of irradiated protoporphyrin-rich fibroblasts by electron microscopy revealed no significant differences between lines from patients with protoporphyria and normal individuals. The earliest indications of photodamage were rarifaction of the mitochondrial matrix with dilatation of cristae. dilatation of endoplasmic reticulum, and loss of plasma membrance integrity. Condensation of the cells correlated with cell death. These structural alterations suggest a generalized cellular injury. 相似文献
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FeS膜的离子选择性对基体金属腐蚀的影响 总被引:2,自引:0,他引:2
本文采用动电位扫描法研究了A3钢在油田污水中的腐蚀速度,以及S2-对腐蚀速度的影响,通过测膜电位曲线的方法,研究了FeS膜的离子选择性,阐述了FeS膜的离子选择性对基体金属腐蚀行为的影响。研究表明,金属表面的FeS膜是一种双极结构膜,促进腐蚀。 相似文献
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聚合物孔材料的合成与应用 总被引:7,自引:0,他引:7
近年来,有关聚合物孔材料的合成及应用研究日趋活跃,已成为现代材料学研究领域的一大热点。本文分别对微孔、介孔和大孔聚合物孔材料的主要合成方法,如胶态晶体模板法、Track-eteh膜模板法、悬浮聚合法和超临界快速降压法等方法,以及聚合物孔材料在传感器材料的合成、化学分离等领域的应用进展情况进行了综述。 相似文献