NiO-MWCNT修饰热解石墨电极的电化学行为研究

采用滴涂法将适量碳纳米管修饰到热解石墨电极上,后电沉积纳米氧化镍得到MWCNT/NiO/PG复合修饰电极。研究了它的电化学行为,并用于抗坏血酸的测定。试验表明,在pH=6的磷酸盐缓冲溶液中,抗坏血酸在修饰电极上产生一灵敏的氧化峰。当抗坏血酸的浓度在1.0×10-5～5.0×10-4 mol/L时,氧化峰电流与浓度呈线性关系,线性方程为:I(uA)=-0.4458-0.5922C(mmol/L),相关系数为R=-0.9989。检出限低至5.5×10-7 mol/L。该传感器重现性、稳定性、抗干扰性良好。     

Corrosion behavior of a duplex stainless steel under cyclic loading: a scanning Kelvin probe force microscopy (SKPFM) based microscopic study

Corrosion fatigue behavior of the duplex stainless steel AISI 2205 was studied by the scanning Kelvin probe force microscopy (SKPFM) in the ambient temperature and pressure condition (25?°C, one standard atmospheric pressure). Surface-polished AISI 2205 samples were subject to a cyclic tensile stress while immersed in a 0.5?M NaCl solution. At specified time intervals, surface Volta potential of the samples was measured using the SKPFM in an oxygen and water regulated environment. The steel samples demonstrated a map of potentials with high contrasts between ferritic and austenitic grain domains, which was then linked to the actual corrosion potential (w.r.t. a saturated calomel electrode—SCE) based on a rigorous calibration procedure. The corrosion fatigue behavior of AISI 2205 was studied by comparing the SKPFM-measured Volta potentials of the same sample under applied cyclic strain and under no applied cyclic strain. It was found that AISI 2205 became more prone to corrosion when the applied tensile strain exceeds one percent (1?%).     

电石渣在电镀废水处理中的应用

文章介绍了一种以废治废的新工艺,该工艺利用电石渣代替烧碱作为中和沉淀剂处理电镀废水,不仅可以节约处理成本,而且使电石渣得到了综合利用,减轻环境污染,达到"以废治废"的目的,环境效益及经济效益显著。     

西门子工艺制备多晶硅体系的热力学分析

利用吉布斯自由能理论对西门子体系进行了热力学分析,梳理了体系中可能发生的系列化学反应。结果表明,多晶硅生产主反应为裂解反应而非还原,SiHCl3裂解生成SiCl2(g)和HCl(g),进而生成Si和SiCl4(g)。这不仅合理地解释了实际生产中副产大量四氯化硅等问题,而且为优化还原工艺提供了有价值的科学依据。     

某轻客轮胎异常磨损原因和解决方法的研究

本文根据某轻型客车市场批量轮胎异常磨损实际情况,以前轮定位参数为突破口,从转向、悬架系统的结构设计入手,找到导致轮胎异常磨损的具体原因。对最重要的影响因素前轮定位参数重新进行设计,通过相关试验验证其值选取的合理性,并有效解决了该车型轮胎异常磨损问题。     

Investigation of fundamental data for nitrile butadiene rubber in monochlorobenzene and o‐dichlorobenzene

Fundamental data, including density and rheological behavior, of nitrile butadiene rubber in solutions of monochlorobenzene and o‐dichlorobenzene were investigated, under a wide range of experimental conditions, including operation temperatures and polymer concentrations up to 165°C and 20% (wt), respectively. Shear rates of up to 1300/s were used for the measurement of rheological behavior. Within the range of the operational conditions employed, the solutions of nitrile butadiene rubber show Newtonian fluid behavior. A characteristic viscosity is proposed as a model parameter to correlate the viscosity of the NBR solutions. As a result, empirical correlation equations for density and viscosity are formed. The purpose of this work is to provide fundamental data for process development of the solution hydrogenation of nitrile butadiene rubber.     

少学时化工原理课程教学改革初探

我们对本校少学时化工原理课程教学实施了课程教学改革。实践证明,教改取得了较好的效果。     

季铵化-N-(4-咪唑甲基)壳聚糖的制备及其胶束形成

以壳聚糖、4-咪唑甲醛和碘甲烷为原料,制备了季铵化-N-（4-咪唑甲基）壳聚糖（TM-MI-CS）。用1H NMR、FTIR和EA等进行表征,并考察了TM-MI-CS在不同pH值条件下胶束的形成。结果表明,TM-MI-CS在水溶液中能形成稳定的胶束,TEM图显示胶束为球形结构,其临界胶束浓度为0.714 mg/mL;不同pH值条件下制备的胶束,平均粒径为188～607 nm,胶束的粒径变化对pH值具有一定的响应性。     

可生物降解热塑性聚氨酯弹性体的合成与性能研究

以中等分子量聚碳酸亚丙酯多元醇作为软段,并与过量的甲苯二异氰酸酯生成预聚物,用1,4–丁二醇进行扩链制备热塑性聚氨酯弹性体,整个反应体系保持—NCO/—OH=1.2。研究了硬段含量变化对材料结构与性能的影响。结果表明,所得弹性体的拉伸性能随着硬段含量的增加而增大,这是微相分离变化的结果;弹性体具有较好的生物降解性,可用于潮湿恶劣环境。     

三氯化铈掺杂聚苯胺电致变色器件的制备与表征

利用恒电位法在ITO导电玻璃表面制备了三氯化铈掺杂聚苯胺薄膜,该薄膜比未掺杂三氯化铈的薄膜更加光滑致密、附着力更好,用该薄膜组装成了电致变色器件,器件具有深蓝色–蓝色–蓝绿色–黄绿色–浅黄色的颜色变化。