High Photoinduced Ordering and Controllable Photostability of Hydrophilic Azobenzene Material Based on Relative Humidity

Shi, Yue1,2,3; Zhao, Chenxiang3; Ho, Jacob Yeuk-Lung3; Song, Feng2; Chigrinov, Vladimir G.3; Luo, Dan1; Kwok, Hoi-Sing3; Sun, Xiao Wei1

2018-04-17

10.1021/acs.langmuir.8b00039

LANGMUIR   影响因子和分区

0743-7463

Azobenzene materials provide an effective way for liquid crystal (LC) alignment besides traditional rubbing technology. A strong relationship between relative humidity (RH) and the photoalignment quality of hydrophilic azobenzene dye brilliant yellow (BY) has been investigated. Good photoalignment quality can only be ensured at about 40% RH or below. On the other hand, the photostability of the alignment layer is also influenced dramatically by RH. The rewritability can be guaranteed at extremely low RH (<= 10%). It is gradually lost with increasing RH, and the alignment layer becomes photostable against further light exposure when at 40% RH or above. Therefore, the BY photoalignment layer can be tuned from rewritable to photostable by simply adjusting RH, and thus multistep photopatterned alignments can be obtained and reserved based on this method. Similar properties are also expected for other hydrophilic azobenzene photoalignment materials, where the specific RH values may vary correspondingly. The reason is due to the strong intermolecular interaction and J-aggregate formation of BY molecules with water insertion. Moreover, the lyotropic LC formed by J-aggregated BY molecules in aqueous solution is reported here.

SCI ; EI

英语

第一 ; 通讯

Foshan Innovation Project[2014IT100072]

Chemistry ; Materials Science

Chemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary

WOS:000430512400005

AMER CHEMICAL SOC

20181605036311

Alignment ; Azobenzene ; Hydrophilicity ; Liquid crystals ; Molecules ; Solutions

Mechanical Devices:601.1 ; Organic Compounds:804.1 ; Atomic and Molecular Physics:931.3

CHEMISTRY

Web of Science

1.Southern Univ Sci & Technol, Dept Elect & Elect Engn, 1088 Xueyuan Rd, Shenzhen 518055, Guangdong, Peoples R China
2.Nankai Univ, Sch Phys, Tianjin 300071, Peoples R China
3.Hong Kong Univ Sci & Technol, State Key Lab Adv Displays & Optoelect Technol, Dept Elect & Comp Engn, Kowloon, Hong Kong, Peoples R China

Shi, Yue,Zhao, Chenxiang,Ho, Jacob Yeuk-Lung,et al. High Photoinduced Ordering and Controllable Photostability of Hydrophilic Azobenzene Material Based on Relative Humidity[J]. LANGMUIR,2018,34(15):4465-4472.

Shi, Yue.,Zhao, Chenxiang.,Ho, Jacob Yeuk-Lung.,Song, Feng.,Chigrinov, Vladimir G..,...&Sun, Xiao Wei.(2018).High Photoinduced Ordering and Controllable Photostability of Hydrophilic Azobenzene Material Based on Relative Humidity.LANGMUIR,34(15),4465-4472.

Shi, Yue,et al."High Photoinduced Ordering and Controllable Photostability of Hydrophilic Azobenzene Material Based on Relative Humidity".LANGMUIR 34.15(2018):4465-4472.