Liquid crystals are molecular materials that combine anisotropy with dynamic nature. Recently, the use of hydrogen bonding for design functional liquid crystalline has been shown to be a versatile approach toward control simple molecularly assembled structures and induction function. A variety hydrogen-bonded prepared by self-assembly processes via bond formation. Rod-like disk-like low-molecular weight complexes polymers side-chain, main-chain, network, guest-host have built complexation...

Self-organized anisotropic ion-conductive materials can be formed by the interactions between a conventional ionic liquid and hydroxyl-terminated mesogenic compounds. Anisotropic conductivities could measured for samples that oriented monodomains in measurement cell. The Figure shows compound cells used these measurements. (See also cover)

Helical self-assembled columns form supramolecular chiral cubic and columnar liquid-crystalline phases (see picture). The complexation of hydrogen-bonded disks folic acid derivatives that have oligo(glutamic acid) moieties lipophilic alkyl chains with nonchiral ions leads to the self-assembly Pm3n hexagonal structures.

Copper nanoparticles (NPs) with an average particle diameter of 50-60 nm were successfully obtained by reducing aqueous solution a copper(II)-nitrilotriacetic acid complex hydrazine at room temperature under air atmosphere. NP-based nanopastes printed onto glass substrate using metal screen mask and pressureless sintered nitrogen atmosphere 200 °C for 30 min. The electrical resistivity the resulting copper electrode was 16 μΩ · cm. For metal-to-metal bonding test, nanopaste on oxygen-free...

Surface-enhanced Raman scattering (SERS) is an attractive technique in molecular detection with high sensitivity and label-free characteristics. However, its use protein limited by the large volume of proteins, hindering approach to narrow spaces hotspots. In this study, we fabricated a Au nanoTriangle plate Array on Gel (AuTAG) as SERS substrate attaching (AuNT) arrangement thermoresponsive hydrogel surface. The AuTAG acts actively tunable plasmonic device, which interparticle distance...

Ellipsoidal anatase TiO2 nanoparticles of different aspect ratios were obtained by the gel-sol method in presence amino acids which resulting particles basically single crystals, but highly rough surfaces or partly polycrystalline structures observed with a high concentration glutamic acid aspartic acid.

The first simple-cubic liquid crystal was obtained by coating monodisperse Au nanoparticles (NPs) with a thick corona of amino-substituted organic dendrons. This unusual structure determined grazing-incidence diffraction and electron density reconstruction explained analyzing the radial profile corona. Another novel is proposed for phase preceding cubic one: hexagonal superlattice composed alternating dense sparse strings NPs.

Folic acid derivatives having 2-(3,4-dialkoxyphenyl)ethyl moieties have been found to exhibit thermotropic liquid-crystalline behavior. Smectic and discotic phases are observed for these compounds over wide temperature ranges. X-Ray diffraction infrared measurements show that the formation of smectic is due ribbon- disk-like structures pterin rings folic acid, respectively. The phase changed a hexagonal columnar by addition alkali metal salts. This behavior attributed change hydrogen-bonded...

Calcium titanate fine particles controlled precisely in size and morphology were synthesized by an optimized hydrothermal method. Their photocatalytic activity was evaluated as the effect of particle morphology, that is, exposed surface. The successfully with aging temperature alternative use Ti-sources, such a TiO2 dispersion titanium–triethanolamine complex. CaTiO3 measured evolution amount H2 from methanolic aqueous solution decomposition acetic acid water. As result, rod-like showed...

Gas sensing with oxide nanostructures is increasingly important to detect gaseous compounds for safety monitoring, process controls, and medical diagnostics. For such applications, sensor sensitivity one major criterion. In this study, sensitively volatile organic (VOCs) at very low concentrations, we fabricated porous films using SnO2 nanocubes (13 nm) nanorods different rod lengths (50-500 that were synthesized by a hydrothermal method. The response H2 increased decreasing crystal size;...

The oxidative desulfurization-fluorination reaction of organosulfur compounds using an N-haloimide and a fluoride source is demonstrated to be effective mild fluorinaton method that allows us synthesize in high yields with chemoselectivity various types gem-difluoro compounds, trifluoromethyl-substituted (hetero)aromatics, trifluoromethyl ethers, N-trifluoromethylanilines. Herein briefly summarized are the synthetic procedures as well scope limitations reaction. applicability by synthesis...

A novel organic−inorganic hybrid thermotropic liquid crystal (LC) is developed by the hybridization of an organic amine with a mesogenic core and acicular anisotropic TiO2 particle through adsorption amino group to surfaces TiO2. The LC shows nematic phases in wide ranges temperatures. Variable-temperature small-angle X-ray measurements reveal that formation one-dimensional order particles on submicrometer scale induces crystallinity. This technique would lead induction dynamic functions...

Abstract Trifluoromethyl ethers R-OCF3 are easily synthesized from the corresponding dithiocarbonates R-OCS2Me (R = aryl or primary alkyl) by a reagent system consisting of 70% HF/pyridine and an N-halo imide. When reaction is applied to wherein R secondary alkyl, tertiary benzylic group, fluorination leading alkyl fluorides R-F achieved, whereas combination 50% N-bromosuccinimide affords trifluoromethyl secondary).

A novel organic−inorganic hybrid thermotropic liquid crystal (LC) is developed by the hybridization of an organic phosphate having a mesogenic core and monodispersed α-Fe2O3 particles with different shapes through specific adsorption group to surfaces parallel c-axis α-Fe2O3. The LC shows nematic or cubic liquid-crystallinity in wide ranges temperatures. Variable-temperature small-angle X-ray measurements reveal that spontaneous formation periodic structure induces crystallinity. This...

Highly crystalline cubic-shaped ITO nanoparticles with narrow size distribution were successfully prepared through a one-step process from mixed ethylene glycol solution of indium and tin salts. The present paper is focused on the detailed study their solvothermal synthesis, in particular, effect variables shape. In system using as solvent, it was observed that direct formation occurred dissolution–recrystallisation amorphous-like hydroxides initially formed precursors. mean controlled 15.1...

A self-assembled lyotropic liquid crystal (LLC) system exhibiting dynamic and reversible polymorphism was developed using the synthetic cyclic ethynylhelicene oligomers cyclobis[(M)-D-n] (n = 4 6), in which two oligomer moieties are connected by flexible linkers. The molecular structure designed to control aggregation properties ranging from level macroscopic level. changed its between random coils an intramolecular homo-double helix induced temperature solvents. In presence of...

Monodispersed barium zirconate fine particles with high crystallinity were synthesized by hydrothermal reactions using hydroxide and a Zr–triethanolamine complex.

The molecular orientation effect of a liquid crystalline (LC) epoxy resin (LCER) on thermal conductivity was investigated, with the depending surface free energy amorphous soda–lime–silica glass substrate surfaces modified using physical treatments. LC monomer revealed to form smectic A (SmA) phase homeotropic alignments substrates that possess high energies 71.3 and 72.7 mN m–1, but forming planar alignment possesses relatively low 46.3 m–1. optical microscopy observations X-ray analyses...

A chiral azobenzene derivative containing a cyclic syn-carbonate moiety functions as gelator for various organic solvents; the dipole-dipole interaction drives fibrous self-assembly of rodlike gelator.

Abstract Trifluoromethylamines are easily synthesized from dithiocarbamates by a reagent system consisting of tetrabutylammonium dihydrogentrifluoride and an N-halo imide under mild conditions. When this reaction was applied to ArN(R)CS2Me at higher temperatures, the trifluoromethylation accompanied halogen substitution p-position Ar group. The synthesis trifluoromethyl-substituted adenosine is also described.

Abstract Amphiphilic ionic liquid derivatives form self-organized lamellar crystals with room temperature liquids. The conductivities along the smectic layers have been obtained for samples aligned in cells electrodes. highest value is 4.3×10-2 S cm-1 at 139 °C.