以N,N-二甲基环己胺为油相,十二烷基硫酸钠(SDS)为表面活性剂,正丁醇为助表面活性剂制备了一种CO_2触发型可逆微乳体系。研究了微乳的微观结构,并考察了盐浓度、温度、SDS/正丁醇质量比对微乳相行为的影响。实验结果表明,原微乳体系的...以N,N-二甲基环己胺为油相,十二烷基硫酸钠(SDS)为表面活性剂,正丁醇为助表面活性剂制备了一种CO_2触发型可逆微乳体系。研究了微乳的微观结构,并考察了盐浓度、温度、SDS/正丁醇质量比对微乳相行为的影响。实验结果表明,原微乳体系的电导率和粒径分别为10.44 m S/cm和(2.70±0.03)nm;经CO_2/N_2交替刺激下微乳体系的电导率和粒径分别为13.17 m S/cm和(1.50±0.07)nm,制备的微乳体系具有可逆切换性能。随含水率增加,微乳由油包水型向双连续型再到水包油型微乳转变;盐浓度增加微乳区面积减小,微乳稳定性减弱;但温度对微乳稳定性无显著影响;当SDS/正丁醇质量比为1∶1时,微乳区面积最大。展开更多
Photoactive cocrystal materials have received growing research interest in construction of photofunctional systems owing to the crucial roles in modifying the photo-related properties of molecular solids, based on the...Photoactive cocrystal materials have received growing research interest in construction of photofunctional systems owing to the crucial roles in modifying the photo-related properties of molecular solids, based on the non-bonding interactions between self-assembly units. Herein, we report tunable luminescence and acid-base stimuli-responsive properties of a cocrystal assembled by 4-[2-(4-quinolinyl)vinyl]phenol (qv) and tetrafluoroterephthalic acid (a). The luminescent properties (such as wavelength, quantum yield and fluorescence lifetime) of qv.a changed obviously relative to the pristine qv, due to the proton transfer and the alternation of molecular arrangement within two-component crystalline material. The photoemission intensity of qv.a underwent from weak to strong upon HCl gas fuming, and the corresponding wavelength changed from 517 nm to 597 nm, which can be reversibly transferred after exposed in NH3. Such luminescent switching behavior may provide an effective way to develop new types of photoactive stimuli-responsive materials and optical sensors.展开更多
An organic compound exhibiting simultaneously reversible switch between its emission colors and luminescence mechanisms,possessing high contrast from deep blue normal fluorescence(NF) to yellow thermally activated del...An organic compound exhibiting simultaneously reversible switch between its emission colors and luminescence mechanisms,possessing high contrast from deep blue normal fluorescence(NF) to yellow thermally activated delayed fluorescence(TADF),is reported. Based on these two complementary colors, white-light emission combining NF and TADF from a single compound can be achieved in various states. Experimental results and density functional theory calculations indicate that the controllable conformational distribution under thermal and mechanical activation is the mechanism responsible for the reversible switching behavior.展开更多
文摘以N,N-二甲基环己胺为油相,十二烷基硫酸钠(SDS)为表面活性剂,正丁醇为助表面活性剂制备了一种CO_2触发型可逆微乳体系。研究了微乳的微观结构,并考察了盐浓度、温度、SDS/正丁醇质量比对微乳相行为的影响。实验结果表明,原微乳体系的电导率和粒径分别为10.44 m S/cm和(2.70±0.03)nm;经CO_2/N_2交替刺激下微乳体系的电导率和粒径分别为13.17 m S/cm和(1.50±0.07)nm,制备的微乳体系具有可逆切换性能。随含水率增加,微乳由油包水型向双连续型再到水包油型微乳转变;盐浓度增加微乳区面积减小,微乳稳定性减弱;但温度对微乳稳定性无显著影响;当SDS/正丁醇质量比为1∶1时,微乳区面积最大。
基金supported by the National Natural Science Foundation of China (21301016, 21473013)the National Basic Research Program of China (2014CB932103)+2 种基金Beijing Municipal Natural Science Foundation (2152016)the Fundamental Research Funds for the Central UniversitiesAnalytical and Measurements Fund of Beijing Normal University
文摘Photoactive cocrystal materials have received growing research interest in construction of photofunctional systems owing to the crucial roles in modifying the photo-related properties of molecular solids, based on the non-bonding interactions between self-assembly units. Herein, we report tunable luminescence and acid-base stimuli-responsive properties of a cocrystal assembled by 4-[2-(4-quinolinyl)vinyl]phenol (qv) and tetrafluoroterephthalic acid (a). The luminescent properties (such as wavelength, quantum yield and fluorescence lifetime) of qv.a changed obviously relative to the pristine qv, due to the proton transfer and the alternation of molecular arrangement within two-component crystalline material. The photoemission intensity of qv.a underwent from weak to strong upon HCl gas fuming, and the corresponding wavelength changed from 517 nm to 597 nm, which can be reversibly transferred after exposed in NH3. Such luminescent switching behavior may provide an effective way to develop new types of photoactive stimuli-responsive materials and optical sensors.
基金supported by the National Key R&D Program of China (2016YFB0401004)the National Natural Science Foundation of China (51625301, 51573059, 91233116)+1 种基金the National Basic Research Program of China (2015CB655003)Guangdong Provincial Department of Science and Technology (2016B090906003, 2016TX03C175)
文摘An organic compound exhibiting simultaneously reversible switch between its emission colors and luminescence mechanisms,possessing high contrast from deep blue normal fluorescence(NF) to yellow thermally activated delayed fluorescence(TADF),is reported. Based on these two complementary colors, white-light emission combining NF and TADF from a single compound can be achieved in various states. Experimental results and density functional theory calculations indicate that the controllable conformational distribution under thermal and mechanical activation is the mechanism responsible for the reversible switching behavior.
