Light‐Induced Buckles Localized by Polymeric Inks Printed on Bilayer Films

Buckling instabilities generate microscale features in thin films in a facile manner. Buckles can form, for example, by heating a metal/polymer film stack on a rigid substrate. Thermal expansion differences of the individual layers generate compressive stress that causes the metal to buckle over the entire surface. The ability to dictate and confine the location of buckle formation can enable patterns with more than one length scale, including hierarchical patterns. Here, sacrificial “ink” patterned on top of the film stack localizes the buckles via two mechanisms. First, stiff inks suppress buckles such that only the non‐inked regions buckle in response to infrared light. The metal in the non‐inked regions absorbs the infrared light and thus gets sufficiently hot to induce buckles. Second, soft inks that absorb light get hot faster than the non‐inked regions and promote buckling when exposed to visible light. The exposed metal in the non‐inked regions reflects the light and thus never get sufficiently hot to induce buckles. This second method works on glass substrates, but not silicon substrates, due to the superior thermal insulation of glass. The patterned ink can be removed, leaving behind hierarchical patterns consisting of regions of buckles among non‐buckled regions.     

纳米SiO2-端羧基丁腈橡胶改性水性环氧树脂复合材料的制备及性能

以端羧基丁腈橡胶（CTBN）和纳米SiO₂（nano SiO₂）为增韧剂,先利用相反转法将CTBN与环氧树脂（EP）的共聚物制备成乳液,然后加入nano SiO₂进行共混,最后加入固化剂经梯度升温固化制得nano SiO₂-CTBN改性的水性环氧树脂（nano SiO₂-CTBN/WEP）复合材料。通过FTIR、SEM、TEM、万能拉伸试验仪和TG对nano SiO₂-CTBN/WEP复合材料的性能进行表征。结果表明：当CTBN含量为20%（与EP E-51的质量比）时,所制备的CTBN/WEP具有较好的储存稳定性,在此基础上加入nano SiO₂,当其含量为3%时增韧效果最好,nano SiO₂-CTBN/WEP的拉伸强度达14.5 MPa,断裂伸长率达9.1%,冲击强度为11.3 kJ/m²,弯曲强度达22.4 MPa,较未添加nano SiO₂的CTBN/WEP分别提高了40.1%、27.4%、73.9%和72.7%,其初始热分解温度也提高了近25℃。     

Interconnected Metallic Membrane Enabled by MXene Inks Toward High-Rate Anode and High-Voltage Cathode for Li-Ion Batteries

The ever-increasing popularity of smart electronics demands advanced Li-ion batteries capable of charging faster and storing more energy, which in turn stimulates the innovation of electrode additives. Developing single-phase conductive networks featuring excellent mechanical strength/integrity coupled with efficient electron transport and durability at high-voltage operation should maximize the rate capability and energy density, however, this has proven to be quite challenging. Herein, it is shown that a 2D titanium carbide (known as MXene) metallic membrane can be used as single-phase interconnected conductive binder for commercial Li-ion battery anode (i.e., Li₄Ti₅O₁₂) and high-voltage cathodes (i.e., Ni_0.8Mn_0.1Co_0.1O₂). Electrodes are fabricated directly by slurry-casting of MXene aqueous inks composited with active materials without any other additives or solvents. The interconnected metallic MXene membrane ensures fast charge transport and provides good durability, demonstrating excellent rate performance in the Li//Li₄Ti₅O₁₂ cell (90 mAh g⁻¹ at 45 C) and high reversible capacity (154 mAh g⁻¹ at 0.2 C/0.5 C) in Li//Ni_0.8Mn_0.1Co_0.1O₂ cell coupled with high-voltage operation (4.3 V vs Li/Li⁺). The LTO//NMC full cell demonstrates promising cycling stability, maintaining capacity retention of 101.4% after 200 cycles at 4.25 V (vs Li/Li⁺) operation. This work provides insights into the rational design of binder-free electrodes toward acceptable cyclability and high-power density Li-ion batteries.     

导电油墨在印刷电子方面的研究进展

随着新型柔性电子器件的出现、发展与应用,印刷电子的制备工艺相对于其他传统技术表现出成本低、效率高以及可大面积生产等比较优势,逐步受到广泛关注.而导电油墨作为印刷电子工艺中的重要组成部分,越来越多的科研工作者对其进行了研究.为此针对导电油墨进行了相关论述,并阐明了未来导电油墨的发展方向,其中重点介绍了金属纳米颗粒型、金属有机分解型和金属纳米线型等不同导电体系的导电油墨,评述了它们的整体特点、制作方法和应用实例,并针对各油墨体系提出了改进其在基材上的附着力设计方法.可以看出:在印刷电子工艺中所使用的导电油墨,其性质与特征决定了整个制备工艺的流程和最终产品性能,并且将会继续沿着低成本、环境友好型和高导电性等方向进行发展.     

汽车保险杠水性漆工艺应用研讨

调研了国内汽车保险杠喷涂工艺及所用涂料水性化的现状,分析了保险杠涂料水性化的工艺趋势,介绍了常见的保险杠喷涂工艺流程,包括干式前处理、火焰处理等,制定了水性漆的漆膜性能要求,确定了水性漆验证方案并对2个涂料厂家的产品予以验证,据此建立了新的保险杠涂装生产线。     

可聚合阳离子表面活性剂DMDB的合成及在颜料分散中的应用

以甲基丙烯酸二甲胺乙酯和1-溴代十二烷为原料,吩噻嗪为阻聚剂,在50℃恒温反应20 h,合成了可聚合阳离子表面活性剂——甲基丙烯酰氧乙基十二烷基二甲基溴化铵(DMDB),用FTIR、1HNMR对其结构进行了表征,研究了其水溶液的性质。以DMDB为分散剂,用超声波粉碎法制备了超细颜料分散体系,考察了DMDB质量分数分别为0.1%、0.3%、0.5%、0.7%、1%时超细颜料分散体系的性能,结果表明,当w(DMDB)≥0.3%时,分散体系的粒径小于300 nm,Zeta电位在25 mV左右,具有较好的离心稳定性。     

平板玻璃用釉料的装饰方法和发展趋势

重点介绍了国内外玻璃釉料的发展历程和平板玻璃装饰方法,特别指出,水性无铅环保玻璃釉料是玻璃深加工行业发展的必然趋势。     

天然多糖基室温磷光油墨的制备及防伪应用

目的 为解决常规发光防伪油墨环境不友好，防伪性能单一等问题，以生物基材料为刚性主体结构，芳香磺酸类化合物为客体分子制备水性生物基室温磷光油墨，探索其性能调控因素及包装防伪应用性能。方法 将生物基材料与芳香磺酸类化合物溶于水中获得室温磷光油墨，调控油墨组分、含量等因素，研究其对油墨黏度、油墨层磷光性能的作用机理，并套印不同发光颜色、余辉时长的防伪油墨，获得多色、动态发光的防伪图案，挖掘其包装防伪应用潜力。结果 实验表明，在水性油墨中，生物基材料添加的质量分数为8%，芳香磺酸类化合物添加量为0.16%时，油墨干燥后获得最佳的长余辉发光效果；使用模板刮涂方式印刷防伪图案，模板厚度为0.5mm时，防伪图案综合效果最佳。结论 具有丰富氨基、羟基等基团的生物基材料（如羧甲基壳聚糖、海藻酸钠），能形成具有强氢键作用的刚性结构，有效抑制芳香磺酸类化合物的非辐射跃迁，提升了所制备油墨的发光寿命和效率，有效提升了包装防伪油墨的环境友好度及防伪性能。     

水基硅橡胶固化膜的性能

以硅溶胶作增强剂,二月桂酸二丁基锡为催化剂,研究了增强剂、固化剂及催化剂对水基硅橡胶的乳液黏度、表干时间及固化膜性能的影响。结果表明,硅溶胶是水基硅橡胶有效的增强剂,硅溶胶和固化剂用量对水基硅橡胶的物理机械性能及固化速率有显著影响;二月桂酸二丁基锡可以明显改变水基硅橡胶的固化速率,但对固化物的物理机械性能不会产生明显的影响。当硅溶胶和固化剂的质量分数分别为20%和4.0%时,固化膜可具有拉伸强度3.11 MPa、扯断伸长率520%、邵尔A硬度55的良好性能。