1193687-83-0Relevant academic research and scientific papers
Side-chain polysiloxane liquid crystalline elastomers from non-mesogenic components
Mohana,Umadevi
, p. 15968 - 15978 (2019)
Synthesis and characterisation of two new azo-based polysiloxane elastomers containing non-mesogenic monomers and different cross-linkers are described. The chemical structure of the synthesised compounds was confirmed through standard analytical techniques. Remarkably, both the elastomers displayed mesophase, despite the monomer and the cross-linker being non-mesogens. The mesophase was characterised by a combination of differential scanning calorimetry, polarising optical microscopy and X-ray diffraction experiments. The X-ray diffraction studies revealed an intercalated lamellar structure for the mesophase. Interestingly, the elastomer containing biphenyl-based cross-linker showed mesophase with an extended thermal range compared to the mesophase displayed by its counterpart containing phenyl-based cross-linker. The photoisomerisation behavior of the elastomers in solution and their photoswitchable properties in the solid state have been investigated. The monodomain sample of the elastomer showed a reversible, asymmetric bending and unbending behavior upon exposure to UV and visible light respectively, with a faster response time.
Photoisomerisation and ligand-controlled reversible aggregation of azobenzene-functionalised gold nanoparticles
K?hntopp, Anja,Dabrowski, Alexandra,Malicki, Michal,Temps, Friedrich
supporting information, p. 10105 - 10107 (2014/08/18)
The photochemical behaviour of functionalised gold nanoparticles (AuNPs) carrying azobenzenethiolate-alkylthiolate monolayers was investigated. Repeated trans-cis and cis-trans isomerisation cycles could be performed in all cases with high efficiency. Reversible photoinduced aggregation was observed when azothiolates with long alkyl spacers (≥C7) were combined with short (C5) alkylthiolate coligands. The choice of a coligand thus offers control over the aggregation properties of the nanoparticles. This journal is the Partner Organisations 2014.
Dynamically self-assembling carriers enable guiding of diamagnetic particles by weak magnets
Chovnik, Olga,Balgley, Renata,Goldman, Joel R.,Klajn, Rafal
supporting information, p. 19564 - 19567 (2013/02/22)
We show that diamagnetic particles can be remotely manipulated by a magnet by the reversible adsorption of dual-responsive, light-switchable/ superparamagnetic nanoparticles down to their surface. Adsorption occurs upon exposure to UV light, and can be reversed thermally or by ambient light. The dynamic self-assembly of thin films of the dual-responsive nanoparticles induces attractive interactions between diamagnetic particles. We demonstrate that catalytic amounts of the dual-responsive nanoparticles are sufficient to magnetically guide and deliver the diamagnetic particles to desired locations, where they can then be released by disassembling the dynamic layers of superparamagnetic nanoparticles with visible light.
