以聚电解质多层膜为纳米反应器制备Au@Pt核壳纳米粒子

以聚二烯丙基二甲基氯化铵和聚苯乙烯磺酸钠为构筑单元,通过静电层层自组装制备了多层膜,利用薄膜中存在的抗衡阴离子,选择AuCl-4和PtCl2-6作为Au和Pt的前驱体,通过连续的阴离子交换/还原,原位制备了Au-Pt双金属纳米粒子。 紫外-可见分光光度法、透射电子显微镜和能量色散X射线能谱数据表明,在聚电解质多层薄膜中成功地制备了具有核壳结构的Au@Pt双金属纳米粒子。 这种纳米粒子在电化学催化、燃料电池方面具有潜在的应用价值。     

固相微萃取法在禁用偶氮染料检测中的应用初探

将固相微萃取技术应用于出口染色纺织品及皮革制品中禁用偶氮染料检验,偶染料经连二亚硫酸钠还原成芳胺后,用固相微萃取技术萃取富集后,用ＧＣ－ＭＳ分析。实验了萃取方式、萃取纤维、pＨ值、浓度、温度、萃取时间及色谱条件等因素对萃取与测定的影响。     

水溶性聚酯的结构和性能

由对苯二甲酸二甲酯、间苯二甲酸、间苯二甲酸二甲酯５－磺酸钠与乙二醇等共缩聚合成的ＰＥＴ型水溶性聚酯（ＷＳＰ）是一种新型的水溶性聚合物，在化纤、纺织、涂料、粘合剂、电子、油墨等领域有着广泛的应用前景．化纤领域超细纤维新材料的研究、开发和生产，迫切需要一...     

聚溴化炔丙基喹啉及聚溴化炔丙基吖啶的简便高效制备及其结构与性质表征

在本研究工作中,我们发展了通过溴丙炔(propargyl bromide)分别与喹啉(quinoline)、吖啶(acridine)直接反应来制备聚溴化炔丙基喹啉[poly(propargyl quinolinium bromide),PPQB]和聚溴化炔丙基吖啶[poly(propargyl acridinium bromide),PPAB]的新方法. PPQB与PPAB的主链均为聚乙炔结构,侧链分别为季铵化喹啉盐和吖啶盐基团,是一类单取代的聚电解质型聚乙炔(polyelectrolyte polyacetylenes,PE-PAs). 我们提出了上述反应的机理,即溴丙炔与喹啉或吖啶反应生成季铵盐产物并导致产物结构中炔基基团的活化,使得季铵盐发生自聚合反应生成PPQB或PPAB. PPQB及PPAB具有较高的分子量(PPQB及PPAB的分子量分别为1.8×10⁵和8.1×10⁴ g/mol). 进一步的表征表明,PPQB和PPAB均具有良好的荧光活性和导电性能.     

Synthesis and Characterization of Polyesters Based on Diethylketone Moiety

A new class of unsaturated polyesters based on diethylketone have been prepared by interfacial polymerization of 2,4-bis（4-hydroxybenzylidene）-3-pentanone（I） and 2,4-bis（4-hydroxy-3-methoxybenzylidene）-3-pentanone（II） with 4,4’-azodibenzoyl chloride and 3,3’-azodibenzoyl chloride at ambient temperature. The model compounds were synthesized by reaction of（I） and（II） with benzoyl chloride. The new monomers, model compounds and polyesters have been characterized by different spectral analyses. The polyesters have inherent viscosity of 0.55-0.80 d L/g and moderate number average molecular weight（Mn） in the range of 6150-7400 g/mol. Most of the compounds exhibited their solubility in aprotic solvents while partial solubility in various halogenated organic solvents was observed. The temperatures of 10% weight loss were high（225-330 °C） in nitrogen, indicating that these polyesters have excellent thermal stability. Doping with iodine dramatically raised the conductivity and produced brown colored semiconductive polymers with a maximum conductivity of 2.7 × 10-6 --1cm-1. Moreover, the morphological properties of selected example of polyesters were detected by SEM.     

Synthesis of Novel and Thermally Stable Water Insoluble Coumarin‐based Azo Dyes via a Mild and Green Procedure

A series of novel azo coumarin dyes were synthesized by the diazotization of 7‐amino coumarins in the presence of catalytic amounts of tungstate sulfuric acid (TSA) followed by coupling with phenol derivatives. Tungstate sulfuric acid catalyzes this reaction at room temperature and short reaction time with high yields.     

Facile and Mild Synthesis and Characterization of Some New Diazo Dyes on the Basis of Schiff Bases in the Presence of Nanocrystalline Magnesium Oxide as a Base Catalyst under Solvent‐free Conditions

In this research, some new diazo dyes including Schiff base have been synthesized by the condensation reaction between ethylenediamine and derivatives of salicylaldehyde containing diazo functional groups in the presence of nanocrystalline magnesium oxide as a solid base catalyst under solvent‐free conditions. Nanocrystalline magnesium oxide has been characterized by XRD, BJH and TEM techniques. The corresponding products have been obtained in excellent yields and high purity. All of the obtained diazo‐Schiff bases are highly colored and can be applicable as useful diazo dyes and characterized by spectroscopy data.     

Photocatalytic degradation of azo dyes in aqueous solutions under UV irradiation using nano-strontium titanate as the nanophotocatalyst

Research on photocatalytic degradation rate of azo dyes using nano-strontium titanate in photocatalysis process was the main goal of present study. In this regard, the influence of the main operating parameters such a photocatalyst concentration, dye concentration, temperature, pH and the presence of hydrogen peroxide upon dye removal rate under UV irradiation was studied. The absorbance of samples was measured by a UV–Vis spectrophotometer. The structure and morphology of nano-powder were investigated using scanning electron microscopy and crystalline structure by X-ray diffraction spectroscopy. The results reveal that nano-strontium titanate has high and significant photocatalytic activity and in comparison with nano-titanium dioxide was superior photocatalyst.