scholarly journals Two-Step Self-Assembly and Lyotropic Liquid Crystal Behavior of TiO2Nanorods

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Zhimin Ren ◽  
Chao Chen ◽  
Rong Hu ◽  
Kaiguang Mai ◽  
Guodong Qian ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Self Assembly ◽  
Driving Force ◽  
Growth Process ◽  
Lyotropic Liquid Crystal ◽  
Synthesis Process ◽  
Lamellar Phases ◽  
Promising Application ◽  
Lower Temperature ◽  
Secondary Assembly

Several self-assembly structures of anatase TiO2nanorods were obtained by a two-step assembly process, and these structures formed different lyotropic liquid crystal in solution. Primary self-assembly occurred in synthesis process and formed two structures, in the morphology of ribbon and honeycomb, respectively. Secondary-assembly took place when the products were placed at lower temperature, where unique structures were obtained as the relative amount of ribbon and honeycomb changed with the increase of TiO2concentration. These structures showed nematic, spherulites, and lamellar phases. The mechanism of the two-step self-assembly was clarified. The driving force of primary assembly is deduced to be anisotropic attractive force, for NRs can assemble at any concentrations, while gravity is the driving force of the secondary assembly. It is worth mentioning that this paper is the first report about spherulites composing of anatase TiO2nanorods. The spherulites obtained were negative or of tangential type, and its structure, growth process, and temperature influences were also investigated. The spherulites may have promising application in temperature microsensor.

A nanostructured bifunctional acid–base catalyst resin formed by lyotropic liquid crystal monomers

2020 ◽  
Vol 98 (7) ◽  
pp. 332-336
Author(s):  
Gregory E. Dwulet ◽  
Benjamin J. Coscia ◽  
Michael R. Shirts ◽  
Douglas L. Gin
Keyword(s):  
Liquid Crystal ◽  
Self Assembly ◽  
Polymeric Materials ◽  
Dimethyl Acetal ◽  
Bifunctional Catalyst ◽  
Lyotropic Liquid Crystal ◽  
Solid Catalyst ◽  
Test Reaction ◽  
Highly Active ◽  
Nitroaldol Reaction

An ordered, nanoporous polymer resin was prepared from the self-assembly of lyotropic liquid crystal monomers and employed as a heterogeneous, bifunctional catalyst. This material contains antagonistic acid and base sites in the periodic nanopores and efficiently catalyzes a model tandem reaction (i.e., the deacetalization–nitroaldol reaction between benzaldehyde dimethyl acetal and nitromethane to yield β-nitrostyrene) with excellent product selectivity. This lyotropic liquid crystal-based solid catalyst represents one of the few examples of polymeric tandem catalysts synthesized by a “bottom-up” strategy that imparts control over the stoichiometry of acidic and basic monomers and is the only reported example of a lyotropic liquid crystal-based polymer that contains mutually incompatible catalytic groups. Furthermore, this heterogeneous catalyst is highly active, exhibiting a turnover frequency for this tandem test reaction that exceeds other reported catalytic polymeric materials.

scholarly journals Lyotropic liquid crystal phase behavior of a cationic amphiphile in aqueous and non-stoichiometric protic ionic liquid mixtures

Soft Matter ◽  
2020 ◽  
Vol 16 (41) ◽  
pp. 9456-9470
Author(s):  
Dilek Yalcin ◽  
Calum J. Drummond ◽  
Tamar L. Greaves
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Crystal ◽  
Self Assembly ◽  
Liquid Mixtures ◽  
Lyotropic Liquid Crystal ◽  
Liquid Crystal Phase ◽  
Protic Ionic Liquids ◽  
Protic Ionic Liquid ◽  
Cationic Amphiphile

Protic ionic liquids (PILs) are the largest and most tailorable known class of non-aqueous solvents which possess the ability to support amphiphile self-assembly.

Guanosine Derivatives: Self-Assembly and Lyotropic Liquid Crystal Formation

2003 ◽  
Vol 398 (1) ◽  
pp. 57-73 ◽  
Author(s):  
Silvia Pieraccini ◽  
Tatiana Giorgi ◽  
Giovanni Gottarelli ◽  
Stefano Masiero ◽  
Gian Piero Spada
Keyword(s):  
Liquid Crystal ◽  
Self Assembly ◽  
Lyotropic Liquid Crystal ◽  
Crystal Formation

scholarly journals Synthesis, Self-Assembly and Photoresponsive Behavior of Liquid Crystals Based on Azobenzene

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1560
Author(s):  
Yaming Wu ◽  
Yuhai Liu ◽  
Jianxiang Chen ◽  
Runmiao Yang
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Self Assembly ◽  
Driving Force ◽  
1H Nmr Spectroscopy ◽  
Uv Light ◽  
Light Exposure ◽  
Scanning Calorimetry ◽  
Stimulus Response ◽  
Cis Isomer

A new amphiphilic surfactant (C4-Azo-C5-HDA) was formed by liquid crystals (LCs) based on azobenzene, whose structures were characterized by 1H-NMR spectroscopy. The reversible hydrogelation upon changes in temperature and light exposure was also studied. Under the irradiation of UV light, the trans-isomer of C4-Azo-C5-HDA rapidly photoisomerized to the cis-isomer, resulting in rapid disruption of the gel. The thermotropic liquid crystal behavior of the gelator was investigated via Differential Scanning Calorimetry (DSC) and Polarizing Optical Microscopy (POM). The biocompatibility experiment of multi-stimulus response of the liquid crystal provides a potential driving force for the development of biomaterials.

Lyotropic liquid crystal self-assembly of H2O2-hydrolyzed chitin nanocrystals

2018 ◽  
Vol 196 ◽  
pp. 66-72 ◽  
Author(s):  
Dagang Liu ◽  
Yu Chang ◽  
Donglin Tian ◽  
Wenqi Wu ◽  
Ang Lu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Self Assembly ◽  
Lyotropic Liquid Crystal

Lyotropic liquid crystal engineering moving beyond binary compositional space – ordered nanostructured amphiphile self-assembly materials by design

2017 ◽  
Vol 46 (10) ◽  
pp. 2705-2731 ◽  
Author(s):  
Leonie van ‘t Hag ◽  
Sally L. Gras ◽  
Charlotte E. Conn ◽  
Calum J. Drummond
Keyword(s):  
Liquid Crystal ◽  
Crystal Engineering ◽  
Self Assembly ◽  
Lyotropic Liquid Crystal ◽  
Materials By Design ◽  
Component Systems ◽  
Compositional Space

Engineering guidelines for an increased control over properties of self-assembly materials using multi-component systems is crucial for their applications.

Sign in / Sign up

Export Citation Format

Share Document