Recyclable,Flexible, Low‐Power Oxide Electronics

The ability to process and dimensionally scale field‐effect transistors with and on paper and to integrate them as a core component for low‐power‐consumption analog and digital circuits is demonstrated. Low‐temperature‐processed p‐ and n‐channel integrated oxide thin‐film transistors in the complementary metal oxide semiconductor (CMOS) inverter architecture are seamlessly layered on mechanically flexible, low‐cost, recyclable paper substrates. The possibility of building these circuits using low‐temperature processes opens the door to new applications ranging from smart labels and sensors on clothing and packaging to electronic displays printed on paper pages for use in newspapers, magazines, books, signs, and advertising billboards. Because the CMOS circuits reported constitute fundamental building blocks for analog and digital electronics, this development creates the potential to have flexible form factor computers seamlessly layered onto paper. The holistic approach of merging low‐power circuitry with a recyclable substrate is an important step towards greener electronics.     

Flexible Hybrid Paper Made of Monolayer Co3O4 Microsphere Arrays on rGO/CNTs and Their Application in Electrochemical Capacitors

A facile one‐step hydrothermal method is developed for large‐scale production of well‐designed flexible and free‐standing Co₃O₄/reduced graphene oxide (rGO)/carbon nanotubes (CNTs) hybrid paper as an electrode for electrochemical capacitors. Densely packed unique Co₃O₄ monolayer microsphere arrays uniformly cover the surface of the rGO/CNTs film. The alkaline hydrothermal treatment leads to not only the deposition of Co₃O₄ microspheres array, but also the reduction of the GO sheets at the same time. The unique hybrid paper is evaluated as an electrode for electrochemical capacitors without any ancillary materials. It is found that the obtained hybrid flexible paper, composed of Co₃O₄ microsphere array anchored to the underling conductive rGO/CNTs substrate with robust adhesion, is able to deliver high specific capacitance with excellent electrochemical stability even at high current densities, suggesting its promising application as an efficient electrode material for electrochemical capacitors.     

Mechanically Drawable Thermochromic and Mechanothermochromic Polydiacetylene Sensors

Recently, the development of directly writable techniques for depositing functional materials on solid substrates has received great attention. These pen‐on‐paper approaches enable generation of diverse patterned images on solid substrates in a flexible, easy handling, and inexpensive manner. Herein, the development of a directly writable conjugated polymer is described. Mechanically, drawable colorimetric polydiacetylene (PDA)–wax composites are readily fabricated by using a simple mixing‐molding method. Images are mechanically drawn on a paper substrate using the PDA–wax composites, display thermochromism, and mechanothermochromism. The thermochromic transition temperature is dependent on the melting point of the wax and, as a result, can be precisely controlled by the type of wax used. Optical microscopic analysis shows that formation of the DA–wax composite involves movement of wax molecules into a single diacetylene (DA) crystal. This process results in growth of the crystal. Importantly, the PDA crystal, obtained after UV light irradiation, undergoes significant shrinkage upon heating because of the release of monomers and the embedded wax molecules from the crystal. The release of these molecules creates void in the PDA supramolecules, allowing the PDA chains to undergo C–C bond rotation and hence the blue‐to‐red color transition.     

基于NFC与Qi的无源电子纸显示设计

传统的电子纸显示装置耗电量大、内容更换繁琐,为增强其便捷性、缩小体积、降低功耗,文中基于LPC824结合近场通信技术与无线充电技术,并配合手机App设计了一款终端无源的电子纸显示装置。将带有NFC功能的手机靠近显示装置,可刷新电子纸上信息,移开手机后,信息可长期保留,且无需电源供电。通过对设计方案进行测试,实验结果验证了该方案的合理性与实用性。     

速度,效率,环保：关于中国造纸工业持续发展的一些思考

本文探讨了在我国经济体制深入改革的新形势下，造纸工业发展的动力与主要制约因素，以及行业持续发展值得重视的一些问题。     

正交试验法优化改性黄麻纤维茶叶泡袋纸制备工艺及安全性评价

目的以黄麻纤维为原料,制备高透气度茶叶泡袋纸。方法通过机械打浆处理和NaOH/尿素/ZnO水溶液改性处理,探索最佳打浆度和改性体系的最佳配比,对茶叶泡袋纸干抗张强度、湿抗张强度、撕裂度、透气度、厚度和紧度等进行测定,并对茶叶泡袋纸进行初步应用和安全评价。结果打浆度在45～70?SR之间的黄麻纤维均可制备性能良好的茶叶泡袋纸;当黄麻质量(绝干)为10 g,改性体系体积为500 mL时,NaOH、尿素、ZnO的最佳质量分数配比为6%∶10%∶0.4%,该条件下滤纸的透气度为3868.9μm/(Pa?s),抗张强度为0.60kN/m。结论改性茶叶泡袋纸的热浸泡效果优于未改性茶叶泡袋纸。热浸出物检测结果显示,重金属指标和感官指标均符合国标规定的生活饮用水要求,采用黄麻制备茶叶泡袋纸可行。     

纸浆模塑结构参数的仿真研究

介绍了纸浆模塑衬垫特点及其设计的现状。选用UG软件对桶形结构单元建模,使用Nastran软件对其结构进行有限元的仿真模拟分析。分析得出:在不同载荷作用下,该单元结构在拔模斜度为3°时抗压强度最好,最大变形最小;当拔模斜度一定时,缓冲高度与受力面直径的比值,与该结构单元抗压强度之间未呈现规律的线性关系。     

国内外间位芳纶纸蜂窝性能对比研究

本试验分别对使用国产和进口间位芳纶纸制作的蜂窝芯材进行了常温、高温、湿热老化后力学性能以及垂直燃烧性能研究。试验发现,中、高密度国产NHA(YT)-1蜂窝各项性能已基本达到并部分超过进口NHA-1蜂窝性能,低密度国产间位芳纶纸蜂窝力学性能与进口间位芳纶纸蜂窝尚存差距,有待改进。结果表明,国产间位芳纶纸已基本达到蜂窝生产要求,实现了重要原材料的国内自主保障。     

液相色谱串联质谱法测定烟用纸张中的芳香胺

建立了液相色谱串联三重四级杆质谱(LC-MS/MS)测定烟用纸张中20种芳香胺的检测方法。用柠檬酸缓冲液浸泡烟用纸张,加入连二亚硫酸钠还原为芳香胺,浸泡液过固相萃取小柱后,用甲醇洗脱,并浓缩定容,进行液相色谱串联质谱测定。该方法的回收率为77.5%～112.1%, 精密度(RSD)为1.4%～13.4%,检出限均小于0.1 ng/mL。该方法灵敏度高,分析时间短,适用于烟用纸张中芳香胺的测定。