Synthesis of Polyaniline/Pd Nanoparticles via Ligand Exchange

Polyaniline/Pd nanoparticles were synthesized via ligand exchange. Pre-prepared water soluble starch/Pd nanoparticles were treated with polyaniline, and washed with water, leading to the small and well-dispersed polyaniline/Pd nanoparticles. The redox state of polyaniline was preserved during the ligand exchange reaction.

Isomerization and Hydrocracking of n-Decane over Bimetallic Pt–Pd Clusters Supported on Mesoporous MCM-41 Catalysts

n-Decane hydroconversion has been investigated on bifunctional catalysts comprising bimetallic Pt–Pd clusters supported on an AlMCM-41 (n_Si/n_Al = 23) mesoporous molecular sieve. The catalytic activity of the bimetallic Pt–Pd catalysts is higher than that of the monometallic Pt and Pd catalysts. The good balance between the two catalytic functions, namely acid sites and metal sites, also results in a higher isomer yield at a substantially lower reaction temperature. Moreover, cracking on the metal sites (hydrogenolysis) is largely suppressed over certain bimetallic catalysts.     

Alumina Over-coating on Pd Nanoparticle Catalysts by Atomic Layer Deposition: Enhanced Stability and Reactivity

Abstract  

ALD Alumina was utilized as a protective layer to inhibit the sintering of supported nano-sized ALD Pd catalysts in the methanol decomposition reaction carried out at elevated temperatures. The protective ALD alumina layers were synthesized on Pd nanoparticles (1–2 nm) supported on high surface area alumina substrates. Up to a certain over-coat thickness, the alumina protective layers preserved or even slightly enhanced the catalytic activity and prevented sintering of the Pd nanoparticles up to 500 °C.     

Fabrication of Pd–Au Clusters by In Situ Spontaneous Reduction of Reductive Layered Double Hydroxides

Catalysis Letters - In this work, layered double hydroxides (LDHs) including the variable valence Co2+ ions (CoAl-LDHs) is discovered to be capable of serving as the support and the reducing agent...     

掺杂引发剂对聚苯胺和煤基聚苯胺导电性影响

以盐酸为掺杂剂、过渡金属盐为引发剂,制备了煤基聚苯胺(CPANI)和聚苯胺(PANI),探讨了掺杂引发剂及力化学作用对CPANI和PANI导电性能的影响,并研究了CPANI,PANI的红外光谱图.结果表明,在过渡金属盐的作用下,制备的CPANI,PANI具有一定导电性能,这表明过渡金属盐在一定程度上起到了引发苯胺单体聚合的作用,但相对过硫酸铵作为引发剂引发聚合的CPANI,PANI而言,导电性能有一定程度的下降.     

导电高聚物聚苯胺的开发应用

聚苯胺可应用于抗静电,电磁波屏蔽,防蚀,敏感元件有机晶体管,电致变色材料和微电子等领域,具有广阔的市场前景,目前国外已有ＰＡＮ的工业化产品,国内ＰＡＮ的研究开发尚处于实验阶段。     

Investigation of the Effect of DOP on Polyaniline and Polyaniline/Polystyrene Nanocomposites

Polyaniline nanocomposite was prepared in aqueous media by polymerization of aniline using ((NH₄)₂S₂O₈) as an oxidant in the presence of dioctyl phthalate (DOP). Also polyaniline/polystyrene (PAn/PS) nanocomposite was prepared in the aqueous solution by polymerization of styrene and aniline using potassium iodate (KIO₃) and ammonium peroxy disulfate ((NH₄)₂S₂O₈) as oxidant in the presence of dioctyl phthalate (DOP). The PAn and PAn/PS nanocomposites were characterized in terms of morphology, chemical structure and glass transition temperature. The chemical structure, morphology and glass transition temperature of product were studied by Fourier Transform Infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and differential scanning calorimetry (DSC).     

Controlled Synthesis of Linear Polyaniline Tubes and Dendritic Polyaniline Fibers with Stearic Acid

Summary One dimensional linear polyaniline (PANI) tubes (with cavity about 2-3 nm) and three dimensional dendritic PANI fibers (with different length) have been synthesized by chemical oxidation polymerization of aniline doped with stearic acid at room temperature. The shape of the as-prepared PANI could be easily tuned from line to dendriform and to network simply by controlling the concentrations of aniline and stearic acid. Scanning electron microscopy and transmission electron microscopy were applied to investigate the various kinds of morphologies. UV-vis absorption spectra and Raman spectra suggested these as-prepared PANI were in conductive emeraldine state and the various kinds of structures could affect their property.     

聚苯胺的制备及其在涂料中的应用

导电聚苯胺有优异的导电性能、化学稳定性和防腐蚀性能,具有巨大的潜在实用性价值介绍了导电聚苯胺的国内外研究现状、防腐蚀机理、制备方法及其在涂料中的应用。     

含氟聚苯胺的合成及性能研究

含氟的高分子聚合物,通常具有很强的抗逆性、抗高温、抗化学腐蚀、具有耐久性和耐候性,因此其在石油化学、工业建筑等方面被广泛应用,研究此类聚合物具有很强的实际意义。主要研究含氟聚苯胺,将总结它的合成方法、阐述它的性质以及实际应用。     

回收钯灰中钯、铂、铑含量的测定

1前言 在陶瓷、玻璃装饰材料生产中,钯、铂、铑是有一定用量的贵金属。而回收钯灰中铂、铑作为主要杂质影响钯纯度,为钯的再利用增加一定难度,因而钯灰中钯、铂、铑含量测定为钯的再利用提供了有效数据。     

聚苯胺改性的研究进展

在导电聚合物中,聚苯胺(PANI)由于具有很高的导电性、热稳定性、容易制备等性质而受到了格外的关注。但由于PANI分子链骨架的刚性较强,分子间相互作用力大,导致其溶解、加工性能较差,对其实际应用造成了极大限制。为了改善提高聚苯胺的溶解性和加工性能,大量的研究人员对PANI展开了深入的研究。本文介绍了采用乳液聚合法和反相乳液聚合法合成聚苯胺,;介绍了聚苯胺苯环上和氨基氮上取代或改性两大类衍生物,分析了聚苯胺及其衍生物的结构,对其研究和应用作了简要综述。。     

聚苯胺吸波材料的研究进展

介绍了质子酸掺杂的聚苯胺的微波吸收机理、吸波性能影响因素和聚苯胺／无机、有机复合材料的制备方法及其微波吸收性能，并就聚苯胺作为新型微波吸收材料的应用前景和发展方向进行了展望。     

聚苯胺的合成及应用研究进展

聚苯胺是研究最为广泛的导电高分子材料之一。综述了聚苯胺的各种合成方法,介绍了聚苯胺的应用前景。     

导电聚苯胺的合成与表征

采用微乳液聚合法,以苯胺为单体、十二烷基苯磺酸(DBSA)/盐酸(HCl)复合酸掺杂制备了导电聚苯胺,通过红外光谱对其结构进行了表征,考察了合成工艺条件对聚苯胺导电性能的影响,探讨了有机无机复合酸体系对聚苯胺热稳定性的影响。在复合酸十二烷基苯磺酸与盐酸物质的量比为3∶2、复合酸与单体物质的量比为2.0∶1、聚合温度为20℃、聚合时间为10h的优化条件下,所得到的掺杂态聚苯胺导电性能最佳。适当配比的有机无机复合酸掺杂后,导电聚苯胺的热稳定性显著提高。     

聚苯胺纳米纤维的合成及表征

以D-樟脑磺酸为掺杂剂,十二烷基苯磺酸钠为软模板,过硫酸铵为氧化剂,在水溶液体系中通过苯胺原位聚合制备得到聚苯胺纳米纤维,对其进行了紫外和红外的表征,并使用SEM对其形貌进行了观测。进一步研究结果表明,樟脑磺酸的掺杂可促进聚苯胺纳米纤维的形成,并同时起到掺杂剂和软模板的双重作用;通过控制反应的时间,可调节产物的形貌结构。     

导电聚苯胺的制备方法及应用

综述了导电聚苯胺的研究进展,采用对比的方法详细介绍了聚苯胺的合成方法及其改进措施,简要介绍了聚苯胺在二次电池及传感器件等方面的应用研究,指出了聚苯胺研究中存在的问题,并对聚苯胺研究的前景进行了展望。     

导电高分子聚苯胺的合成及应用

聚苯胺(PANI)是研究最为广泛的导电高分子材料之一。综述了聚苯胺的结构、特性及几种合成聚苯胺的方法,介绍了聚苯胺的掺杂方法及聚苯胺的应用前景。     

Polyaniline nanofibers supported on titanium as templates for immobilization of Pd nanoparticles: A new electro‐catalyst for hydrazine oxidation

Palladium nanoparticles (Pd‐NPs)/polyaniline (PAni)/titanium (Ti) catalysts were prepared using electroless deposition of Pd‐NPs on PAni matrixes coated on Ti substrate. PAni/Ti electrodes were synthesized by electro‐polymerization of aniline on Ti. The morphology of Pd‐NPs on PAni/Ti electrodes were characterized by scanning electron microscopy technique and results indicated that Pd‐NPs were uniformly dispersed on the surface of PAni film. The electro‐catalytic properties of Pd‐NPs/PAni/Ti catalysts toward oxidation of hydrazine were investigated by different electrochemical methods and results showed that Pd‐NPs/PAni/Ti catalysts have high electrochemical activity. In addition, the mechanism of hydrazine electrochemical oxidation catalyzed by Pd‐NPs/PAni/Ti was investigated. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011