Comparative study of the rheological behavior of multiwalled carbon nanotubes and nanofiber composites prepared by the dilution of a masterbatch of polypropylene

In this investigation, the characteristics and the rheological properties of two different nanocomposite systems were investigated. These systems consisted of a dispersion of carbon nanotubes (CNTs) and carbon nanofibers (CNFs) in a polypropylene (PP) matrix. The mixing process was carried out by melt compounding with a twin‐screw corotating extruder with different reinforcement amounts (0.2–20 wt %) from concentrated masterbatches (20 wt %) of PP/CNT and PP/CNF. The results show a remarkable increase in the viscosity for both blends as the reinforcement amount was increased. It was important to evaluate the rheological behavior to understand the effect of the nanocarbon particles on the internal structures and their processing properties of the obtained composites. CNFs were a more viable reinforcement from a processability point of view because the obtained viscosities of the PP/CNF blends were more manageable. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Characterization of the Interaction between Eupatorin and Bovine Serum Albumin by Spectroscopic and Molecular Modeling Methods

This study investigated the interaction between eupatorin and bovine serum albumin (BSA) using ultraviolet-visible (UV-vis) absorption, fluorescence, synchronous fluorescence, circular dichroism (CD) spectroscopies, and molecular modeling at pH 7.4. Results of UV-vis and fluorescence spectroscopies illustrated that BSA fluorescence was quenched by eupatorin via a static quenching mechanism. Thermodynamic parameters revealed that hydrophobic and electrostatic interactions played major roles in the interaction. Moreover, the efficiency of energy transfer, and the distance between BSA and acceptor eupatorin, were calculated. The effects of eupatorin on the BSA conformation were analyzed using UV-vis, CD, and synchronous fluorescence. Finally, the binding of eupatorin to BSA was modeled using the molecular docking method.     

碳纤维增强SiC陶瓷复合材料的研究进展

碳纤维增强SiC陶瓷基复合材料具有良好的高温力学性能，是航空航天和能源等领域新的高温结构材料研究的热点之一．本文回顾了增强体碳纤维的发展，对材料的成型制备工艺，材料的抗氧化涂层研究进展和现有的一些应用做了综述，并展望了碳纤维增强SiC陶瓷基复合材料以后的研究重点及发展前景．     

芳纶帘线在子午线轮胎中的应用

探讨新型原材料芳纶帘线在轿车及轻载车子午线轮胎中的应用问题，结合新型低滞后炭黑DZ-13在胎面胶中的应用试制了全纤维节能型子午线轮胎。全纤维节能型子午线轮胎完全能够达到国家标准，并且比普通子午线轮胎滚动阻力更低，更节油。     

高硫煤基高比表面积活性炭的制备与表征

以高硫、低阶煤为原料，采用硝酸钾预氧化后加KOH化学活化的工艺制备高比表面积活性炭.结果表明，在碱炭比为2.5：1，活化温度为850℃，活化时间为1.5h的工艺条件下可以制备出比表面积为2579.76m^2/g，苯酚吸附容量高达280.07mg/g的活性碳，最后对该活性炭产品进行了初步表征.     

活性炭负载TiO2光降解水中敌敌畏的研究

研究了以活性炭为载体,钛酸丁酯为原料,用溶胶-凝胶法制备的复合型光催化剂———TiO2/AC来光降解水中敌敌畏。实验结果表明:在水样体积为300mL时,光照60min,TiO2负载量(质量分数)为0.4%,初始反应液pH=2.0,光催化剂用量为0.85g时,其光降解率可达92.2%,是同条件下,单独采用TiO2粉末作催化剂光降解率的3倍;TiO2/AC复合型光催化剂样品经10次使用后,对敌敌畏的降解率仍然保持在86%以上。     

Corrosion protective bi‐layered composites of polyaniline and poly(o‐anisidine) on low carbon steel

Bi‐layered composites of polyaniline (PANI) and poly(o‐anisidine) (POA) were investigated for corrosion protection of low carbon steel (LCS). In this work, homopolymers and bi‐layers of PANI and POA were electropolymerized on LCS from an aqueous salicylate solution by using cyclic voltammetry. These coatings were characterized by cyclic voltammetry, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). Corrosion tests were carried out in aqueous 3% NaCl solution for LCS coated with PANI, POA, bi‐layered POA/PANI (POA on top of the PANI) or PANI/POA (PANI on top of the POA) composites using open circuit potential (OCP) measurements, potentiodynamic polarization technique, and electrochemical impedance spectroscopy (EIS). The single layer of PANI and POA protected the LCS in 3% NaCl for 8 and 16 h, respectively. The bi‐layered composite coatings provide effective protection to LCS for a longer time than a single layered PANI or POA coating. However, the corrosion protection offered to LCS depends on the deposition order of polymer layers in the composite. The PANI/POA composite provides better protection to LCS against corrosion than POA/PANI coating. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Hydrothermal synthesis of size-dependent Pt in Pt/MWCNTs nanocomposites for methanol electro-oxidation

A hydrothermal method has been developed to prepare size-controlled Pt nanoparticles dispersed highly on multiwalled carbon nanotubes (Pt/MWCNTs). It was found that the size of Pt nanoparticles was strongly dependent on the solution pH in synthesis. The Pt nanoparticles with mean size of 3.0, 4.2 and 9.1 nm were obtained at pHs 13, 12 and 10 separately. After Pt/MWCNTs composites were fabricated, the different properties of cyclic voltammetry and chronoamperometry in electro-oxidation of methanol were found. The results showed that the smaller diameter Pt deposited Pt/MWCNTs nanocomposites exhibited higher electrocatalytic activity for methanol oxidation. By characterization of X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), size-dependent activities were identified.     

水系有机液流电池活性材料的分子工程研究进展

氧化还原液流电池(RFB)是有良好发展前景的电化学储能技术和大规模可再生能源存储的有效解决方案,其中水系有机氧化还原液流电池(AORFB)不仅成本低,还可以通过分子工程进行活性材料的理性设计,从而高效率地得到具有精准目标性能的新型活性材料。综述了AORFB活性材料的发展历程和研究现状,重点对不同结构活性材料的分子工程研究进行介绍。结合当前研究趋势,提出了活性材料分子工程研究未来发展的方向与思路。     

计算脂肪醇沸点的新方法

直接从脂肪醇的分子结构提取4个结构参数:烷基的极化效应指数PEI、碳原子数目Nc、羟基所连接碳原子上的氢原子个数α-H和羟基与支链相对位置差ΔN,与118种脂肪醇的沸点进行相关分析,得到相关模型方程。运用留一法确证模型方程具有较好的稳定性和预测能力。方程所选用的参数计算简单,物理意义明确,能够被广泛使用。