A Novel Method to Synthesize Polyorganozircosilazane

A new kind of polyorganozircosilazane as Si/Zr/C/N-based ceramic precursor was synthesized from the condensation reaction of hexamethyleyclotrisilazane lithium salts(D3^NLi）and zirconium tetrachloride(ZrCl4).In the presence of N,N,N’,N’-tetramethyl ethylene diamine(TMEDA),polyorganozircosilazane was obtained in high yield.     

A Novel Octahedral Hexasilver(I) Cluster: Ag_6[SSCN(n-C_4H_9)_2]_6

ＣｏｍｐｏｕｎｄｓｆｏｒｍｅｄｆｒｏｍＣｕ ,ＡｇａｎｄＡｕｗｉｔｈｄｉｔｈｉｏ ｌａｔｅｌｉｇａｎｄｓ ,ｓｕｃｈａｓｔｈｅｄｉａｌｋｙｌｄｉｔｈｉｏｃａｒｂａｍａｔｅ (ＤＴＣ) ,ｍｅｒｃａｐｔｏｔｈｉａｚｏｌｉｎｅ (ＨＭＴ)ａｎｄｄｉａｌｋｙｌｄｉｔｈｉｏｐｈｏｓｐｈａｔｅｓ(ＤＤＰ) ,ｈａｖｅｐｌａｙｅｄａｎｉｍｐｏｒｔａｎｔｒｏｌｅｉｎｔｅｃｈｎｏｌｏｇｙ .1Ｃｕ(Ｉ) Ｓｃｌｕｓｔｅｒｓａｌｓｏｈａｖｅｂｅｅｎｉｍｐｌｉｃａｔｅｄｉｎｂｉｏｌｏｇｙａｓａｎ ｔｉ ｏｘｉｄａｎｔｓ .2Ｔｈｅｃｕｂａｎ…     

Detection of Tumor Necrosis Factor Gene by Piezoelectric Nucleic Acid Sensor

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｇｅｎｅｄｉａｇｎｏｓｉｓｔｅｃｈｎｏｌｏｇｙ ,ａｌｓｏｃａｌｌｅｄｎｕｃｌｅｉｃａｃｉｄｐｒｏｂｅｔｅｃｈｎｏｌｏｇｙ ,ｈａｓｂｅｃｏｍｅａｎａｔｔｒａｃｔｉｖｅｍｅｔｈｏｄｉｎｔｈｅｆｉｅｌｄｓｏｆｂｉｏｃｈｅｍｉｓｔｒｙａｎｄｃｌｉｎｉｃａｌｍｅｄｉｃｉｎｅ .Ｉｔｉｓｐｒｏｖｅｄｔｏｂｅｃｏｎｖｅｎｉｅｎｔａｎｄｓａｆｅｕｓｉｎｇｎｏｎ ｒａｄｉｏａｃｔｉｖｅｒｅａｇｅｎｔｓｗｉｔｈｅｌｅｃｔｒｏｃｈｅｍｉｃａｌａｎｄｏｐｔｉｃａｌｄｅｔｅｃｔｏｒ.Ｅｓｐｅ ｃ…     

Effects of Self—coiling of Organic Molecules on Intramolecular Exciplex Formation and Fluoresscence Quenching in DX—H2O Solvent System

Effects of self-coiling of organic molecules on intramolecular exciplex formation of compound I,in which the carbazole chromophore and terephthalic acid methylester acceptor group are linked by one (CH2)10 chain,and the decrease of the fluorescence intensities of compounds Ⅱ，Ⅲ，and Ⅳ,in which the carbazole chromophore and 3,5-dinitrobenzoate are connected by one aliphatic chain of (CH2)10 (Ⅱ），（CH2）12（Ⅲ）,or (CH2)4(Ⅳ）,have been studied in the dioxane (DX)-H2O binary system.The results show that self-coiling of organic molecules in DX-H2O facilitates intramolecular exciplex formation of I and induces the decrease of fluorescence intensities of Ⅱ,bacause of the proximity effect brought about by selfcoiling of organic molecules under hydrophobic-lipophilic interaction(HLI) between the excited carbazole chromophore and the acceptor.Since the similar effects are observed even when the concentration of the probes are less than their CAgCs(critical aggregate concentrations )in the DX-H2O mixture with the same φ values,formation of the intermolecular exciplex has been excluded.The effects are found to be strongly depended on φ values,indication that they are mainly driven by HLI.The properties of the acceptors can also affect the intramolecular exciplex formation.With terephthalic acid methylester moiety as the acceptor,the carbazole chromophore exhibits the fluorescence spectra of the exciplex,while with 3,5-dinitrobenzoate moiety as the acceptor,only the fluorescence spectra of excited carbazolyl chromophore are observed.     

Detection of Tumor Necrosis Factor Gene by Piezoelectric Nucleic Acid Senosr

A piezoelectric nucleic acid sensor was constructed ofr detection of tumor necrosis factor gene.Two methods were employed for immobilization of nucleic acid probe on gold electrode of piezoelectric crystal.The results show that polyethyleneimine adbesion and glutaraldehyde cross-linking method has higher sensitivity,stability and selectivity than protein A method.The solid-phase nucleic acid hybridization of oligo unclecotides and tumor necrosis factor target gene sequence were monitorde using this sensor.Tumor necrosis factor gene sequence(580bp) was detected by this nucleic acid sensor for the first time.     

金属β-二酮化合物用于MOCVD法生长铁电氧化物薄膜

对用于MOCVD法生长铁电氧化物薄膜的金属β－二酮化合物的制备、结构及性质进行了评述，对它们在生长铁电薄膜中的应用现状进行了介绍，并对它们的应用前景作了展望。     

氯离子对铜在玻碳电极上电结晶的影响

采用线性扫描伏安法和计时安培法研究了硫酸铜溶液中铜在玻碳电极上电结晶 的初期行为。在含与不含氯离子的0.05mol·L~(-1) cUso_4-0.5 mol·L~(-1) H_2SO_4电解液中,循环伏安实验结果表明铜在玻碳基体上的沉积没有经过UPD过 程;氯离子明显使Cu的沉积和氧化峰变得尖锐,促进Cu的沉积速度。计时安培实验 结果表明,Cu的电结晶按瞬时成核和三维生长方式进行。氯离子不改变Cu的结晶机 理,但在I～t曲线中,导致电流达最大(I_m)所需的时间t_m减小、晶核数密度和生 长速度增大,从而明显改变Cu沉积层的质量。当Cl~-浓度在10～20mg·L~(-1)范围 内,成核的晶核数密度达较大,即氯离子的最适宜添加量。     

SBA－15的二氧化钛改性及其光催化降解对氯苯酚

在“后合成”法在介孔二氧化硅SBA－15的孔壁表面键接了二氧化钛,并对其 结构进行了表征。改性后的SBA－15保持了规则的介孔结构,并在孔壁表面形成了 类似于锐钛型二氧化钛的Ti-O-Ti网络结构。光催化降解对氯苯酚的结果表明,经 过两次二氧化钛键接的样品表现出较高的光催化效率。但是由于对酚、醌等中间产 物的强烈吸附以及孔道中反应物质的扩散速度慢,使得其光催化活性略低于纯的锐 钛型二氧化钛。     

氧同位素交换及其在多相催化氧化反应研究中的应用

简单介绍了氧同位素交换技术及其在多相催化氧化反应机理研究中的应用     

SMSI effect on ceria supported Cu-Pd catalysts in the hydrogenation of 1,3-butadiene

Ceria-supported copper-palladium catalysts have been tested in the hydrogenation of 1,3-butadiene. The SMSI behavior of the bimetallic catalysts depended on the temperature of reduction. They were analyzed by H₂ chemisorption and XPS.