Triboelectric pulsed direct current for self-powered sterilization of cellulose fiber

A variety of liquid energy exists in papermaking engineering and has not yet been developed and utilized. In addition, for the papermaking industry, the presence of slime can seriously affect the quality of the finished paper and can lead to paper breaking. The current slime control strategies cannot completely solve the problem and also have some low toxicity. In this study, a method of self-powered sterilization of cellulose fibers by using triboelectric pulsed direct current is reported. A liquid–solid triboelectric nanogenerator (L–S TENG) was used to convert the liquid energy of nanocellulose suspension into electrical energy and convert this electrical energy into pulsed direct current for self-powered sterilization of cellulose fiber. A hydrophobic coating material is used as solid triboelectric material and electrode for sterilization. Driven by L–S TENG, the electrodes exhibited an excellent sterilization rate against four microorganisms including Escherichia coli, Aspergillus niger, Candida albicans, and Klebsiella pneumoniae, which from slime in the papermaking industry. This study could provide a basic research theory for liquid energy harvesting in the papermaking industry, and also provide a new strategy for pulp sterilization.

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Ultraviolet up-conversion luminecence of noncrystalline HOP_5O_(l4) induced by 532nm pulsed laser

This paper reports the ultraviolet up-conversion luminescence of the noncrystalline HoP_5O_(14) at room temperature induced by 532nm pulsed laser for the first time and gives some simple analysis.     

Characterization and anticorrosive properties of poly(2,3‐dimethylaniline)/nano‐Al2O3 composite synthesized by emulsion polymerization

Poly(2,3‐dimethylaniline)/nano‐Al₂O₃ composite (PAC) was synthesized by emulsion polymerization using dodecyl benzene sulfonic acid as emulsifier and dopant. The structure of PAC was characterized by Fourier fransformation infrared spectroscopy, UV–visible adsorption spectroscopy, and field emission scanning electron microscopy. The thermal stability was studied by thermogravimetric analysis, and the electrochemical performances were studied by cyclic voltammetry measurements. Epoxy coatings containing PAC and poly(2,3‐dimethylaniline) (P(2,3‐DMA)), respectively, were painted on steel, and accelerated immersion tests were performed to evaluate the anticorrosion property of the coatings in 3.5% NaCl solution. The results showed that the addition of PAC and P(2,3‐DMA) could improve the anticorrosion performance of epoxy coating significantly and the PAC coating had higher corrosion resistance than that of P(2,3‐DMA). Copyright © 2013 John Wiley & Sons, Ltd.     

SDS对C10OMI分子有序组合体及其吸收光谱的影响

分子有序组合体的功能性在很大程度上取决于两亲分子聚集的形式．含有生色基团的两亲分子，其电子吸收光谱会随分子有序化排列方式的不同而发生显著变化，这已为很多实验所证实［’－4］，并应用激于态理论问进行了定性和半定量的说明．这种与分子有序化排列相关的电子光谱变化     

硅改性ZSM－5沸石分子筛的酸性、孔径和择形催化性能的研究

在不同条件下用各种硅改性剂对ＺＳＭ－５沸石分子筛进行改性，并将其用于催化乙苯歧化生成对二乙苯的反应。实验结果表明，在合适条件下用ＳｉＣｌ＿４对ＺＳＭ－５改性后，可以获得高性能形选催化剂。硅改性可以有效地消除催化剂外表面酸中心，并能对分子筛孔道进行微调。根据反应结果和反应物在催化剂中的扩散系数判断，当改性后催化剂的孔道半径与ＮａＺＳＭ－Ｓ沸石孔道半径相近时，其催化选择性最佳。     

引入改进的K-means算法的电缆监测数据优化技术的研究

分布式光纤是一种新型在线监测技术,能极大程度提高电缆健康状态的监测效率。由于光纤处于复杂环境影响中,以及分布式节点实时产生庞大的数据群,这对监测数据的处理技术提出了更高的要求。基于传统的数字式平均法,引入一种改进的k-means聚类算法,实时对各节点产生的数据集处理,能准确的识别因噪声影响而产生的奇异数据,提高了数据反馈的效率和准确性,从而减少了监测系统的漏报和误报现象。现有的实验仿真表明改进的算法较传统算法在数据处理的准确性和快速性上都有明显的提升。     

KNCO中脲热分解动力学的研究

KNCO通常用氢氧化钾和尿素在熔融态下反应而合成,其中过量的尿素用长时间高温焙烧来除去。我们用热重法对KNCO粗品中的尿素进行了热分解动力学研究,以期确定合理的焙烧温度和时间。将分析纯尿素和氢氧化钾按1.7:1(摩尔比)混合均匀,加热熔融,搅拌反应2小时,得含有剩余尿素的白色KNCO试样。热解用北京光学仪器厂LCT型差热天平,a-Al_zO_3为参比物,空气气氛,升温速率10℃/min。红外光谱用Nicolet 5DX型仪,KBr压片。 结果与讨论     

APS/NaClO 复合氧化剂对乳液法合成聚苯胺的微观形貌及其电化学性能的影响

采用乳液法, 以过硫酸铵(APS)和次氯酸钠(NaClO)为复合氧化剂合成导电聚苯胺(PANI). 考察了NaClO 的加入与否对PANI 微观形貌与电化学性能(循环伏安和电导率)的影响, 以及APS、乳化剂十二烷基苯磺酸钠(SDBS)和NaClO的用量对PANI 电化学性能的影响. 结果表明: NaClO 的加入对PANI 的微观取向结构具有重要的影响. 与采用单一APS 合成的PANI 相比, 复合氧化剂合成的PANI 具有较高的循环伏安峰电流以及更加优异的电导率(约为前者的2.6倍). 当苯胺(An)与APS 的物质的量比(n_An:n_APS )为8:7, An 与SDBS 的物质的量比(n_An:n_SDBS )为10:4, NaClO 用量为5%(质量分数)时, PANI 的各项性能指标达到最好; 紫外可见光谱和红外光谱的表征结果表明, 采用复合氧化剂并未对PANI 的分子结构产生明显的影响.