Mechanofluorochromic materials that render sensitive fluorescence color/pattern change upon mechanical stimuli have drawn extensive attention.However,traditional mechanofluorochromism relies on the chemical transforma...Mechanofluorochromic materials that render sensitive fluorescence color/pattern change upon mechanical stimuli have drawn extensive attention.However,traditional mechanofluorochromism relies on the chemical transformations of mechanophores,but their types are quite few.It remains challenging to develop mechanofluorochromic materials with customized fluorescence color changing response.Herein,a generally applicable strategy is proposed to present a class of double-layer mechanofluorochromic hydrogels based on the facile integration of two different-colored fluorescent hydrogels.Due to the UV transmittance change of top layer under Poisson’s effect,the emission intensity ratio of the upper and lower hydrogels exhibits a strain-dependent change,resulting in a force-triggered overlapping color variation.Both the UV transmittance of top layer and the fluorescence emission of bottom layer can be readily modulated to enrich the variety of mechanofluorochromism.Besides,the bottom layer is available to be printed by ion inks to fabricate patterned double-layer fluorescent hydrogel,holding great potential to design flexible mechanofluorochromic platforms for smart display and information encryption.展开更多
Understanding the physical mechanisms governing aggregation-induced-emission(AIE)and aggrega-tion-caused-quenching plays a vital role in developing functional AIE materials.In this work,tetraphenylethene(TPE,a classic...Understanding the physical mechanisms governing aggregation-induced-emission(AIE)and aggrega-tion-caused-quenching plays a vital role in developing functional AIE materials.In this work,tetraphenylethene(TPE,a classical AiEgen)and naphthalimide(NI,a popular fluorophore with ACQ characteristics)were connected through non-conjugated linkages and conjugated linkages.We showed that the nonconjugated-linkage of TPE to NI fragments leads to substantial PET in molecular aggregates and ACQ.In con trast,the conjugated conn ection between TPE and NI moieties results in the AIE phenomenon by suppressing twisted intramolecular charge transfer.This work provides an important guideline for the rational design of AIE materials.展开更多
Mechanoluminescence（ML） refers to the light emission from various organic and inorganic materials upon mechanical stimulus. As a new class of smart materials, mechanoluminescent materials are widely applicable for f...Mechanoluminescence（ML） refers to the light emission from various organic and inorganic materials upon mechanical stimulus. As a new class of smart materials, mechanoluminescent materials are widely applicable for fluorescence switches, mechanosensors, security papers, optoelectronic devices and data storage etc. In the past few years, systematic investigations have been carried out, resulting in the production of a variety of mechanoluminescent materials. In this review, recent progress in pure organic mechanoluminescent materials is summarized, including mechanofluorescent and triboluminescent effects from conjugated small molecules.展开更多
基金the National Natural Science Foundation of China(No.52073297)Sino-German Mobility Program(No.M-0424)+2 种基金the Youth Innovation Promotion Association of Chinese Academy of Sciences(No.2019297)Ningbo Natural Science Foundation(No.2021J194)K.C.Wong Education Foundation(No.GJTD-2019-13).
文摘Mechanofluorochromic materials that render sensitive fluorescence color/pattern change upon mechanical stimuli have drawn extensive attention.However,traditional mechanofluorochromism relies on the chemical transformations of mechanophores,but their types are quite few.It remains challenging to develop mechanofluorochromic materials with customized fluorescence color changing response.Herein,a generally applicable strategy is proposed to present a class of double-layer mechanofluorochromic hydrogels based on the facile integration of two different-colored fluorescent hydrogels.Due to the UV transmittance change of top layer under Poisson’s effect,the emission intensity ratio of the upper and lower hydrogels exhibits a strain-dependent change,resulting in a force-triggered overlapping color variation.Both the UV transmittance of top layer and the fluorescence emission of bottom layer can be readily modulated to enrich the variety of mechanofluorochromism.Besides,the bottom layer is available to be printed by ion inks to fabricate patterned double-layer fluorescent hydrogel,holding great potential to design flexible mechanofluorochromic platforms for smart display and information encryption.
基金financial support from the National Natural Science Foundation of China (Nos.21676113,21772054)Distinguished Young Scholar Program of Hubei Province (No. 2018CFA079)+5 种基金the 111 Project B17019the Scholar Support Program of CCNU (No.0900-31101090002)the Excellent Doctoral Dissertation Cultivation Grant of CCNU from the colleges’ basic research and operation grant (MOE,No.2019YBZZ029)supported by Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules (No. KLSAOFM2012),Hubei University,Chinasupported by excellent doctorial dissertation cultivation grant of CCNU from the colleges’ basic research and operation of MOE (No.2019YBZZ029)A*STAR under its Advanced Manufacturing and Engineering Program (No.A2083c0051)
文摘Understanding the physical mechanisms governing aggregation-induced-emission(AIE)and aggrega-tion-caused-quenching plays a vital role in developing functional AIE materials.In this work,tetraphenylethene(TPE,a classical AiEgen)and naphthalimide(NI,a popular fluorophore with ACQ characteristics)were connected through non-conjugated linkages and conjugated linkages.We showed that the nonconjugated-linkage of TPE to NI fragments leads to substantial PET in molecular aggregates and ACQ.In con trast,the conjugated conn ection between TPE and NI moieties results in the AIE phenomenon by suppressing twisted intramolecular charge transfer.This work provides an important guideline for the rational design of AIE materials.
基金Financial support by the National Natural Science Foundation of China(Nos. 21522405 and 51503142)the Thousand Youth Talents Planthe Natural Science Foundation of Tianjin (No. 15JCYBJC52900)
文摘Mechanoluminescence（ML） refers to the light emission from various organic and inorganic materials upon mechanical stimulus. As a new class of smart materials, mechanoluminescent materials are widely applicable for fluorescence switches, mechanosensors, security papers, optoelectronic devices and data storage etc. In the past few years, systematic investigations have been carried out, resulting in the production of a variety of mechanoluminescent materials. In this review, recent progress in pure organic mechanoluminescent materials is summarized, including mechanofluorescent and triboluminescent effects from conjugated small molecules.
