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古紫质等光驱质子泵以及该类活性蛋白质与聚合物的功能复合材料 被引量:5
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作者 王雅卓 马德旺 +3 位作者 赵迎春 明明 吴佳 丁建东 《高分子学报》 SCIE CAS CSCD 北大核心 2012年第7期698-713,共16页
将具有生物活性的蛋白质与具有良好加工和力学性能的合成高分子相结合制备高性能的杂化材料是材料科学一个新的生长点.本专论聚焦于对具有光驱质子泵功能的两类活性蛋白质——细菌视紫红质(BR)与古紫质4(AR4)的研究,其中BR作为一个著名... 将具有生物活性的蛋白质与具有良好加工和力学性能的合成高分子相结合制备高性能的杂化材料是材料科学一个新的生长点.本专论聚焦于对具有光驱质子泵功能的两类活性蛋白质——细菌视紫红质(BR)与古紫质4(AR4)的研究,其中BR作为一个著名的膜蛋白已有四十余年的研究历史,而AR4则为中国科研人员十余年前所发现.综述了AR4的研究,并对AR4和BR进行了对比,进一步介绍了光敏蛋白质(BR和AR4)与聚合物基质复合制备新型功能高分子材料的工作,还介绍了该类光敏蛋白质的基因工程改造以及蛋白质/聚合物复合膜用于信息材料方面的探索工作.论文总结了一系列创新成果,如(1)在光敏蛋白质的质子泵机理方面,提出了"弱偶联模型"并解释了AR4具有与BR相反的质子释放和提取时间顺序的内在机理;(2)光敏蛋白质与聚合物复合膜相关的高分子水凝胶和蛋白质聚集状态的研究,并发现与均聚物和两亲性小分子不同,两亲性嵌段共聚物可导致光敏蛋白质中间体的寿命有数量级的延长;(3)发展了光敏蛋白质与聚合物复合膜的制备技术,所得到的材料不仅保持了光学活性,其蛋白质的光学响应性能还得到进一步改善;(4)发现了含光敏蛋白质的紫膜强烈抗拒哺乳动物细胞黏附的新功能;(5)尝试将该蛋白质和聚合物的复合膜作为信息材料,实现了全光宽带图像显示.进一步展望了此类光敏蛋白质的后续研究和潜在的应用前景. 展开更多
关键词 细菌视紫红质 古紫质 紫膜 质子泵 光电响应 光色响应 嵌段共聚物 功能高分子材料 复合材料 信息功能材料
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Controllable preparation of ultrathin 2D BiOBr crystals for high-performance ultraviolet photodetector 被引量:2
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作者 Pengfei Liu Lei Yin +6 位作者 Liping Feng Yu Sun Hanqing Sun Wenqi Xiong Congxin Xia Zhenxing Wang Zhengtang Liu 《Science China Materials》 SCIE EI CSCD 2021年第1期189-197,共9页
Ternary layered compound materials(bismuth oxyhalides and metal phosphorus trichalcogenides)stand out in electronic and optoelectronic fields due to their interesting physical properties.However,few studies focus on t... Ternary layered compound materials(bismuth oxyhalides and metal phosphorus trichalcogenides)stand out in electronic and optoelectronic fields due to their interesting physical properties.However,few studies focus on the preparation of high-quality two-dimensional(2D)BiOBr crystals with a typical layered structure,let alone their optoelectronic applications.Here,for the first time,high-quality 2D BiOBr crystals with ultrathin thicknesses(less than 10 nm)and large domain sizes(~100μm)were efficiently prepared via a modified space-confined chemical vapor deposition(SCCVD)method.It is demonstrated that a moderate amount of H2O molecules in the SCCVD system greatly promote the formation of high-quality 2D BiOBr crystals because of the strong polarity of H2O molecules.In addition,a linear relationship between the thickness of BiOBr nanosheets and Raman shift of A1g(1)mode was found.Corresponding theoretical calculations were carried out to verify the experimental data.Furthermore,the BiOBr-based photodetector was fabricated,exhibiting excellent performances with a responsivity of 12.4 A W-1 and a detectivity of 1.6×1013 Jones at 365 nm.This study paves the way for controllable preparation of high-quality 2D BiOBr crystals and implies intriguing opportunities of them in optoelectronic applications. 展开更多
关键词 2D BiOBr crystals SCCVD method H2O molecule interlayer interaction ultraviolet photodetector
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Readily accessible rhodamine B-based photoresponsive material 被引量:3
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作者 LI Kai XIANG Yu +1 位作者 TONG AiJun TANG Ben Zhong 《Science China Chemistry》 SCIE EI CAS 2014年第2期248-251,共4页
A photochromic rhodamine B-based material containing Cd(Ⅱ) as bridge was facilely prepared. The 4-methoxylsalicylalde hyde rhodamine B bydrazone Cd(Ⅱ) complex displayed unusual ring-open response upon 365 nm UV ... A photochromic rhodamine B-based material containing Cd(Ⅱ) as bridge was facilely prepared. The 4-methoxylsalicylalde hyde rhodamine B bydrazone Cd(Ⅱ) complex displayed unusual ring-open response upon 365 nm UV irradiation, exhibiting long photochromic lifetime and good fatigue resistance. The UV-induced ring-open of the complex led to a distinct color and fluorescence change in acetonitrile. A new mechanism was put forward: salicylaldehyde part in the complex underwent UV-promoted isomerization from enol-form to keto-form, enhancing the chelation of Cd(Ⅱ) and yielding the ring-opening rhodamine B part. Compared to other reported photochromic systems, this new photochromic material offered attractive new insights into the development of low cost photochromic materials with good performance. 展开更多
关键词 PHOTOCHROMISM coordination compound rhodamine B salicylaldehyde hydrazone CADMIUM UV-LIGHT
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