- Controllable wettability and adhesion of superhydrophobic self-assembled surfaces based on a novel azobenzene derivative
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Superhydrophobic surfaces with controllable adhesion have received considerable attention due to their potential in numerous applications. Here, we report a controllable adhesion of superhydrophobic surfaces through tuning the self-assembly structure based on a novel Y-shaped molecule AOB-Y8, consisting of azobenzene groups, 1,3,4-oxadiazole moieties, and three octyl chains. The surface hydrophobicity of AOB-Y8 films was successfully regulated by tuning the assembly morphologies through changing the composition of CHCl3/CH3CN mixed solvents, concentration and temperature. Morphological studies of the film prepared from 50 : 50 CHCl3/CH3CN solvents revealed that the self-assembled hierarchical, flower-like structure constructs a lot of grooves to trap the surrounding air, generating the superhydrophobic effect at room temperature. Particularly, the surface adhesion of this superhydrophobic film was further regulated from a low level to a very high level by simply changing the concentration of AOB-Y8 in mixed solvents. Meanwhile, the AOB-Y8 self-assembled surfaces showed an excellent chemical resistance to acid and alkali, which is suitable for applications in many environmental conditions. As examples, the tunable adhesive superhydrophobic AOB-Y8 surfaces demonstrated good features to be used in selective transportation of droplets, self-cleaning and droplet-based microreactors to quantitatively detect NaOH and FeCl3.
- Gao, Qiongqiong,He, Liu,Li, Yajie,Ran, Xia,Guo, Lijun
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p. 50403 - 50409
(2017/11/10)
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- Optical properties of thiophene-containing liquid crystalline and hybrid liquid crystalline materials
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We report new mesogens made of thiophene and stilbene moieties as main building blocks that exhibit nematic and/or smectic phases. The liquid crystalline properties of their thiophene/azobenzene analogues have been found to be strongly suppressed compared to their thiophene/stilbene analogues. In twinned "bent-core" thiophene/azobenzene compound relatively strong fluorescence was found. A new hybrid material built of AuNPs coated with a thiophene-containing mesogenic ligand that forms a smectic phase is shown. In solutions of thiophene-mesogen coated AuNPs an unusual decrease of the ligand fluorescence decay rate was observed. Fluorescence lifetime increase is ascribed to two-point anchoring of ligand molecules resulting in molecule orientation tangential to the AuNP surface. UV-Visible absorption and fluorescence data of all synthesised compounds are presented. the Partner Organisations 2014.
- Romiszewski, Jerzy,Puterová-Tokarová, Zita,Mieczkowski, Jozef,Gorecka, Ewa
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supporting information
p. 2927 - 2934
(2014/07/07)
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