Smart textiles are able to self-adapt to an irregular surface. So, they found new applications in intelligent clothes and equipments, where the properties and functionality of traditional polymeric fibers are insufficient, and hard to be realized. Inspired by the supercontraction behavior of the spider silk, we prepared a spinnable hydrogel to form a sheath-core-like composite yarn, after being coated on cotton yarn. The strong hydrogen bonding between the cotton yarn and the polar groups of the hydrogel provides an outstanding mechanical stability, and the twists insertion forms a spiral-like architecture, which exhibited moisture-responsive super contraction behavior. By structural tailoring the chirality of the fiber twists and coiling extends into homo-chiral and heterochiral architectures, as displays contraction and expansion when is exposed to the moisture. Once the relative humidity is increased from 60 to 90%, a homochiral yarn exhibits 90% contraction, while a heterochiral yarn shows 450% expansion, and the maximum work capacity reached up to 6.1 J/Kg. The super contracted yarn can be re-stretched to its original length manifesting cyclability, which can be exploited to build a smart textile, self-adaptive to irregular surfaces. Such a strategy may be further extended to a wide variety of materials to achieve intelligent textiles from common fiber or yarns.

目的 探索血塞通软胶囊(三七总皂苷)对脑出血大鼠脑组织的保护作用.方法 用胶原酶注射尾状核法构建脑出血大鼠模型,并随机分为对照组和实验组,每组50只;另取50只正常大鼠作为假手术组.假手术组与对照组均灌胃给予等量0.9％NaCL;实验组按50 mg·kg-1·d-1的剂量灌胃给予100 mg·mL-1三七总皂苷(血塞通软胶囊)溶液.3组大鼠每天给药1次,连续给药28 d.用干-湿重法检测脑组织含水量,用分光光度仪法检测脑组织一氧化氮(NO)、丙二醛(MDA)含量和超氧化物歧化酶(SOD)活性.结果 治疗28 d后,实验组、对照组和假手术组脑组织的含水量分别为(78.89±1.57)％,(82.39±1.70)％和(77.83±1.57)％,NO分别为(0.50±0.11),(0.63±0.13)和(0.19±0.10)μmol·g-1,MDA分别为(13.80±1.19),(15.86±1.42)和(9.92±1.37)nmol·mg-1,SOD活性分别为(197.58±11.85),(157.39±16.51)和(199.99±10.81)U·mg-1;实验组的上述指标与对照组比较,差异均有统计学意义(均P<0.05).结论 血塞通软胶囊(三七总皂苷)可通过抑制自由基损伤和氧化应激,缓解脑水肿,从而达到保护脑出血大鼠脑组织的作用.

在聚电解质网络中引入氢键作用或共价键作用,分别形成物理-物理交联双网络和物理-化学交联双网络水凝胶纤维,纤维表面经水分蒸发形成类蜘蛛丝样的核-壳纤维结构.这种聚电解质基的水凝胶纤维展现了114.5MPa的高断裂强度、41.73MJ/m3的高韧性、90％的高阻尼以及湿度响应的超收缩行为.