TY - JOUR
T1 - Photomechanical organosiloxane films derived from azobenzene-modified di- and tri-alkoxysilanes
AU - Harigaya, Takehiro
AU - Kajiya, Ryota
AU - Wada, Hiroaki
AU - Kuroda, Kazuyuki
AU - Shimojima, Atsushi
N1 - Funding Information:
The authors are grateful to Dr. T. Shibue (Materials Characterization Central Lab., Waseda Univ.) [] for solid-state NMR measurements, Mr. Y. Miyamoto (Waseda Univ.) for nanoindentation test, Ms. M. Suzuki (Waseda Univ.) for tensile test, Dr. T. Matsuno, Dr. K. Muramatsu, Dr. M. Koike, Mr. T. Hayashi, Mr. M. Yatomi, and Mr. T. Hikino (Waseda Univ.) for fruitful discussion. This work was supported in part by JSPS Challenging Research (Exploratory) (19K22237). This work was the result of using research equipments (JEOL JNM-ECZ500, JEOL JNM-CMX400, JEOL JMS T100 CS AccuTOF: Material Characterization Central Laboratory) shared in MEXT Project for promoting public utilization of advanced research infrastructure (Program for supporting construction of core facilities) (Grant Number JPMXS0440500021).
Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
PY - 2022/12
Y1 - 2022/12
N2 - Photoresponsive materials that reversibly change their shape upon light irradiation have a wide range of applications, such as sensors and actuators. Previously, we reported a free-standing film of a lamellar azobenzene–siloxane hybrid exhibiting reversible bending triggered by trans–cis photoisomerization of azobenzene. This material was prepared by an evaporation-induced self-assembly process using azobenzene-modified trialkoxysilanes as precursors. In this study, azobenzene-modified diethoxymethylsilane (AzoDES) was used in combination with conventional azobenzene-modified triethoxysilanes as the precursors to investigate the molecular factors affecting the structures and photoinduced bending behaviors of the lamellar azobenzene–siloxane hybrid materials. A lamellar hybrid film showing a higher degree of bending upon UV irradiation was obtained by adjusting the AzoDES content in the alkoxysilane precursors, although a further increase of the AzoDES content resulted in a disordered structure and lower degree of bending. The enhanced photo-deformation was attributed to the decrease in the degree of cross-linking of the siloxane networks.
AB - Photoresponsive materials that reversibly change their shape upon light irradiation have a wide range of applications, such as sensors and actuators. Previously, we reported a free-standing film of a lamellar azobenzene–siloxane hybrid exhibiting reversible bending triggered by trans–cis photoisomerization of azobenzene. This material was prepared by an evaporation-induced self-assembly process using azobenzene-modified trialkoxysilanes as precursors. In this study, azobenzene-modified diethoxymethylsilane (AzoDES) was used in combination with conventional azobenzene-modified triethoxysilanes as the precursors to investigate the molecular factors affecting the structures and photoinduced bending behaviors of the lamellar azobenzene–siloxane hybrid materials. A lamellar hybrid film showing a higher degree of bending upon UV irradiation was obtained by adjusting the AzoDES content in the alkoxysilane precursors, although a further increase of the AzoDES content resulted in a disordered structure and lower degree of bending. The enhanced photo-deformation was attributed to the decrease in the degree of cross-linking of the siloxane networks.
KW - Azobenzene
KW - Inorganic–organic hybrids
KW - Photomechanical materials
KW - Self-assembly
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U2 - 10.1007/s10971-022-05825-w
DO - 10.1007/s10971-022-05825-w
M3 - Article
AN - SCOPUS:85132614601
SN - 0928-0707
VL - 104
SP - 659
EP - 665
JO - Journal of Sol-Gel Science and Technology
JF - Journal of Sol-Gel Science and Technology
IS - 3
ER -