scholarly journals Photocontrollable Crystallization at the Topological Defect of a Liquid Crystalline Droplet

2021 ◽  
Author(s):  
Kenji Katayama ◽  
Yota Sakai
Keyword(s):  
Light Absorption ◽  
Liquid Crystalline ◽  
Topological Defect ◽  
Surfactant Solution ◽  
Light Irradiation ◽  
Crystal Formation ◽  
Dye Molecules

Abstract Photo-controllable crystallization at the topological defect in an LC droplet was demonstrated. The dye molecules dissolved in a surfactant solution outside the LC droplet were promoted to move into the droplet by the light absorption. Nuclei emerged tens of seconds after light irradiation and moved toward the topological defect located at the droplet center, forming a branch-shaped crystal. This phenomenon was reproduced for three different dyes, and photo-induced migration, nucleation, and crystal formation were discussed as a possible mechanism.

scholarly journals Relationship between Liquid Crystal Formation and Conformations of Twin Components in Liquid Crystalline Binary Systems.

1999 ◽  
Vol 56 (6) ◽  
pp. 341-349 ◽  
Author(s):  
Seiji UJIIE ◽  
Hiroko UCHINO ◽  
Kazuyoshi IIMURA ◽  
Moriyuki SATO
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Binary Systems ◽  
Crystal Formation

scholarly journals Нелинейное поглощение растворов метиленового голубого в присутствии плазмонных наночастиц с различным поверхностным зарядом

2020 ◽  
Vol 128 (9) ◽  
pp. 1380
Author(s):  
А.П. Русинов ◽  
М.Г. Кучеренко
Keyword(s):  
Methylene Blue ◽  
Silver Nanoparticles ◽  
Mathematical Models ◽  
Surface Charge ◽  
Light Absorption ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Optical Nonlinearity ◽  
Dye Molecules ◽  
Gold And Silver Nanoparticles

By continuous-pump Z-scanning, the nonlinear light absorption of aqueous and alcohol solutions of methylene blue was studied. It was shown that the mechanisms of optical nonlinearity of these solutions vary depending on the dye concentration and type of solvent. The dependence of the amplitude of nonlinear absorption of dye molecules on the concentration and sign of the surface charge of gold and silver nanoparticles in solution is revealed. Mathematical models of optical nonlinearity for concentrated and diluted solutions of dye molecules are considered; in the latter case, the influence of plasmon nanoparticles on the nonlinear optical characteristics of methylene blue solutions is taken into account

scholarly journals Hybrid ZnO/TiO2Loaded in Electrospun Polymeric Fibers as Photocatalyst

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Evando S. Araújo ◽  
Juliano Libardi ◽  
Pedro M. Faia ◽  
Helinando P. de Oliveira
Keyword(s):  
Block Copolymers ◽  
Continuous Light ◽  
Semiconductor Nanoparticles ◽  
Light Irradiation ◽  
Electrospun Fibers ◽  
Dye Molecules ◽  
Prolonged Action ◽  
Polymeric Fibers

Hybrid ZnO/TiO2nanoparticles were applied as potential photocatalyst agents incorporated into electrospun fibers of enteric block copolymers. The resistance of fibers avoids aggregation and contributes to prolonged action of semiconductor nanoparticles under continuous light irradiation. Such behavior is attributed to the minimal aggregation degree and elevated efficiency of photodegradation of modified nanoparticles in comparison with pristine ones. Hybrid ZnO/TiO2in nanofibers contributes to the association of different mechanisms such as N-deethylation and cleavage of dye molecules applied in the overall process of photodegradation.

scholarly journals Role of elemental carbon in the photochemical aging of soot

2018 ◽  
Vol 115 (30) ◽  
pp. 7717-7722 ◽  
Author(s):  
Meng Li ◽  
Fengxia Bao ◽  
Yue Zhang ◽  
Wenjing Song ◽  
Chuncheng Chen ◽  
...  
Keyword(s):  
Light Absorption ◽  
Elemental Carbon ◽  
Red Light ◽  
Field Measurements ◽  
Light Irradiation ◽  
Photochemical Oxidation ◽  
Chemical Mechanism ◽  
Strong Light ◽  
Electron Transfer Pathway ◽  
Photochemical Aging

Soot, which consists of organic carbon (OC) and elemental carbon (EC), is a significant component of the total aerosol mass in the atmosphere. Photochemical oxidation is an important aging pathway for soot. It is commonly believed that OC is photoactive but EC, albeit its strong light absorption, is photochemically inert. Here, by taking advantage of the different light absorption properties of OC and EC, we provide direct experimental evidence that EC also plays an important role in the photochemical aging of soot by initiating the oxidation of OC, even under red light irradiation. We show that nascent soot, in addition to undergoing photochemical oxidation under blue light with a wavelength of 440 nm, undergoes similar oxidation under red light irradiation of λ = 648 nm (L648). However, separated OC (extracted from soot by n-hexane) and EC exhibit little reactivity under L648. These observations indicate that EC plays a pivotal role in photoaging of soot by adsorbing light to initiate the oxidation of OC. Comparison of in situ IR spectra and photoelectrochemical behaviors suggests that EC-initiated photooxidation of OC proceeds through an electron transfer pathway, which is distinct from the photoaging induced by light absorption of OC. Since the absorption spectra of EC have a much larger overlap with the solar spectra than those of OC, our results provide insight into the chemical mechanism leading to rapid soot aging by organic species observed from atmospheric field measurements.

scholarly journals Photo-controllable rotational motion of cholesteric liquid crystalline droplets in a dispersion system

RSC Advances ◽  
2020 ◽  
Vol 10 (36) ◽  
pp. 21191-21197
Author(s):  
Yota Sakai ◽  
Woon Yong Sohn ◽  
Kenji Katayama
Keyword(s):  
Rotational Motion ◽  
Liquid Crystalline ◽  
Surfactant Solution ◽  
Dispersion System ◽  
System P ◽  
Cholesteric Liquid Crystalline

A photo-controllable rotational motion was demonstrated for an isolated cholesteric liquid crystalline droplet in a surfactant solution.

Effective removal of colourless pollutants and organic dyes by Ag@AgCl nanoparticle-modified CaSn(OH)6 composite under visible light irradiation

2017 ◽  
Vol 41 (13) ◽  
pp. 5334-5346 ◽  
Author(s):  
Chao Liang ◽  
Cheng-Gang Niu ◽  
Xiao-Ju Wen ◽  
Shi-Feng Yang ◽  
Mao-Cai Shen ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Absorption ◽  
Organic Dyes ◽  
Light Irradiation ◽  
Electron Hole ◽  
Visible Light Absorption ◽  
Effective Removal ◽  
Agcl Nanoparticles

The Ag@AgCl nanoparticles could broaden visible-light absorption of pure CSH and depress the recombination of photoinduced electron–hole pairs.

scholarly journals Photo Actuation Performance of Nanotube Sheet Incorporated Azobenzene Crosslinked Liquid Crystalline Polymer Nanocomposite

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 735 ◽  
Author(s):  
Meng Bi ◽  
Yifan He ◽  
Yuchang Wang ◽  
Wenlong Yang ◽  
Ban Qin ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Microelectromechanical Systems ◽  
In Situ Polymerization ◽  
Uv Light ◽  
Polymer Network ◽  
Polymer Nanocomposite ◽  
Crystalline Polymer ◽  
Light Irradiation ◽  
Nanocomposite Films ◽  
Biological Engineering

Crosslinked liquid crystalline polymers (CLCPs) containing azobenzene (AZO-CLCPs) are a type of promising material due to their significance in the design of light-driven smart actuators. Developing AZO-CLCP composites by incorporating AZO-CLCPs with other materials is an effective way of enhancing their practicability. Herein, we report an AZO-CLCP/CNT nanocomposite prepared by the in situ polymerization of diacrylates containing azobenzene chromophores on carbon nanotube (CNT) sheets. The liquid crystal phase structure of CLCP matrix was evidenced by the two-dimensional X-ray scattering. The prepared pure AZO-CLCP films and AZO-CLCP/CNT nanocomposite films demonstrated strong reversible photo-triggered deformation under the irradiation of UV light at 366 nm of wavelength, as a result of photo-induced isomerization of azobenzene moieties in the polymer network. But compared to pure AZO-CLCP films, the AZO-CLCP/CNT nanocomposite films could much more rapidly return to their initial shapes after the UV light irradiation was removed due to the elasticity effect of CNT sheets. The deformation behavior of AZO-CLCP/CNT nanocomposite films under the light irradiation was also different from that of the pure AZO-CLCP films due to the interfacial interaction between a polymer network and CNT sheet. Furthermore, incorporation of a CNT sheet remarkably increased the mechanical strength and robustness of the material. We also used this AZO-CLCP/CNT nanocomposite as a microvalve membrane actuator, which can be controlled by light, for a conceptual device of a microfluidic system. The results showed that this AZO-CLCP/CNT nanocomposite may have great potential in smart actuator applications for biological engineering, medical treatment, environment detection and microelectromechanical systems (MEMS), etc.

A novel ternary MQDs/NCDs/TiO2 nanocomposite that collaborates with activated persulfate for efficient RhB degradation under visible light irradiation

2021 ◽  
Author(s):  
Qian Zhang ◽  
Han Zhao ◽  
Yuming Dong ◽  
Xiangmiao Zhu ◽  
Xiang Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Absorption ◽  
Absorption Capacity ◽  
Hole Transport ◽  
Light Irradiation ◽  
Pollutant Degradation ◽  
Electron Hole ◽  
Activated Persulfate

TiO2 nanosheets modified with dual MQDs/NCD quantum dots not only promote light absorption capacity and electron–hole transport but also collaborate well with activated persulfate for pollutant degradation.

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