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PubMed Journals Articles About "Liquid Crystal Resources" RSS

20:58 EDT 23rd October 2018 | BioPortfolio

Liquid Crystal Resources PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Liquid Crystal Resources articles that have been published worldwide.

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Showing "Liquid Crystal Resources" PubMed Articles 1–25 of 6,600+

Phytantriol-based lyotropic liquid crystal as a transdermal delivery system.

The purpose of this study was examined the feasibility of using phytantriol-based cubic and hexagonal liquid crystal preparation for the percutaneous administration of trans‑cinnamaldehyde (TCA). TCA-loaded lyotropic liquid crystal formulations were prepared and characterized, their skin permeability in vitro and in vivo was evaluated. Preliminary pharmacodynamics were also investigated in adjuvant arthritics (AA) rats. The formulations were identified respectively as cubic and hexagonal structure. The in...


Effects of thermo-order-mechanical coupling on band structures in liquid crystal nematic elastomer porous phononic crystals.

Liquid crystal nematic elastomers are one kind of smart anisotropic and viscoelastic solids simultaneously combing the properties of rubber and liquid crystals, which is thermal sensitivity. In this paper, the wave dispersion in a liquid crystal nematic elastomer porous phononic crystal subjected to an external thermal stimulus is theoretically investigated. Firstly, an energy function is proposed to determine thermo-induced deformation in NE periodic structures. Based on this function, thermo-induced band ...

Tunable High-Resolution Macroscopic Self-Engineered Geometric Phase Optical Elements.

Artificially engineered geometric phase optical elements may have tunable photonic functionalities owing to their sensitivity to external fields, as is the case for liquid crystal based devices. However, liquid crystal technology combining high-resolution topological ordering with tunable spectral behavior remains elusive. Here, by using a magnetoelectric external stimulus, we create robust and efficient self-engineered liquid crystal geometric phase vortex masks with a broadly tunable operating wavelength,...


Unique Supramolecular Liquid Crystal Phases with Different Two-Dimensional Crystal Layers.

We report here a series of tetrablock-mimic azobenzene-containing fullerene dyads that form phase segregated two-dimensional (2D) crystal constructed supramolecular liquid crystals (LCs). The unique double-, triple- and quadruple-layer packing structure of fullerenes in 2D crystals leads to different smectic supramolecular LC phases, and novel LC phase transitions are observed due to the change of fullerene packing layer number in 2D crystals. Interestingly, by combining the LC properties with 2D crystals, ...

End of life liquid crystal displays recycling: A patent review.

A huge quantity of end-of-life liquid crystal displays (LCD) is collected, every year, around the world. Nowadays, this equipment is disassembled, for the removal of hazardous components (e.g. the backlight fluorescent lamps), and the resulting panel is stored. The reason is the significant content of valuable fractions (e.g. glass, metals and liquid crystals) and the lack of a recycling process, sustainable from an economic and an environmental point of view. Considering the relevance of this critical issu...

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals.

Materials showing coupling phenomena between magnetism and (ferro)electricity, i.e., magnetoelectric effects, have attracted a great deal of attention due to their potential applications for future device technologies such as sensors and storage. However, conventional approaches, which usually utilize materials containing magnetic metal ions (or radicals), have a major problem: only a few materials have been found to show the coupling phenomena at room temperature. Recently, we proposed a new approach to ac...

In situ electron diffraction tomography using a liquid-electrochemical TEM cell for crystal structure determination of cathode materials for Li-ion batteries.

We demonstrate that changes in the unit cell structure of lithium battery cathode materials during electrochemical cycling in liquid electrolyte can be determined for particles of just a few hundred nanometer in size, using in situ transmission electron microscopy (TEM). The atomic coordinates, site occupancies (including lithium occupancy) and cell parameters of the materials can all be reliably quantified. This was achieved using electron diffraction tomography (EDT) in a sealed electrochemical cell, with...

Dislocations dynamics during the nonlinear creep of a homeotropic sample of smectic-A liquid crystal.

New creep experiments under sinusoidal compression/dilation deformation of a homeotropic sample of smectic-A liquid crystal (8CB) show that its response is nonlinear at very small amplitude of deformation. This behavior is explained by taking into account the crossing between the edge dislocations that climb parallel to the layers and the screw dislocations joining the two surfaces limiting the sample. The activation energy of the crossing process and the density of the screw dislocations as a function of t...

Optical vortices generated by edge dislocations in electro-convective instability arrays of nematic liquid crystals.

We demonstrated by means of interferometry that optical vortices can be generated by diffraction of a laser beam from a birefringent nematic liquid crystal that spontaneously creates a periodic array of electro-convective domains and edge dislocations under an applied electric field. The diffracted beam of order m produced by an elementary dislocation comprises a number |m| of distinct optical vortices, each with unit topological charge. Birefringent liquid crystal arrays provide a fast, convenient, and pro...

Light-responsive microstructures in droplets of the twist-bend nematic phase.

We report on the structure and optical manipulation of the director configurations in emulsions of liquid crystalline droplets of a compound exhibiting the nematic (N) and the twist-bend nematic phases (N\txtsub{TB}). We demonstrate a decrease of the ratio of the bent elastic constant $K_{33}$ to the splay one $K_{11}$ by nearly two orders of magnitude with decreasing temperature in the N phase. The director structures in liquid crystal droplets doped with a photoswitchable surfactant without and under ultr...

Experimental limits for eigenvalue calibration in liquid-crystal Mueller-matrix polarimeters.

A numerical study is carried out to find the experimental conditions necessary for the eigenvalue calibration procedure to work correctly in a liquid-crystal variable-retarder-based Mueller-matrix polarimeter. Using the error between the simulated experimental Mueller matrix in a polarimeter with errors and the expected ideal Mueller matrices for four calibration samples, the maximum experimental errors are estimated for a successful eigenvalue calibration. It is found that the retarder axes' orientations h...

Mixtures of Blue Phase Liquid Crystal with Simple Liquids: Elastic Emulsions and Cubic Fluid Cylinders.

We numerically investigate the behavior of a phase-separating mixture of a blue phase I liquid crystal with an isotropic fluid. The resulting morphology is primarily controlled by an inverse capillary number, χ, setting the balance between interfacial and elastic forces. When χ and the concentration of the isotropic component are both low, the blue phase disclination lattice templates a cubic array of fluid cylinders. For larger χ, the isotropic phase arranges primarily into liquid emulsion droplets whic...

Instant Locking of Molecular Ordering in Liquid Crystal Elastomers by Oxygen-Mediated Thiol-Acrylate Click Reactions.

Liquid crystal elastomers (LCEs) with intrinsic anisotropic strains are reversible shape-memory polymers of interest in sensor, actuator, and soft robotics applications. Rapid gelation of LCEs is required to fix molecular ordering within the elastomer network, which is essential for directed shape transformation. A highly efficient photo-cross-linking chemistry, based on two-step oxygen-mediated thiol-acrylate click reactions, allows for nearly instant gelation of the main-chain LCE network upon exposure to...

Giant enhancement and facile tuning of photoluminescence in a soft anisotropic magneto-gel.

A soft photoluminescent composite, prepared using a nematic liquid crystal and a fluorescent gelator, exhibits a nearly two orders of magnitude increase in fluorescence on addition of superparamagnetic nanoparticles. The internal magnetic field generated leading to an increase in the population of singlet excitons which affects the radiative efficiency, and enhanced ordering of the LC environment are proposed to be responsible for the large increase seen in fluorescence. Also, the nematic nature of the host...

Simultaneous determination of Brilliant Green and Crystal Violet dyes in fish and water samples with dispersive liquid-liquid micro-extraction using ionic liquid followed by zero crossing first derivative spectrophotometric analysis method.

In this study, dispersive liquid-liquid micro-extraction using ionic liquid (IL-DLLME) combined with zero crossing first derivative spectrophotometric method was applied to quantitative determination of triphenylmethane dyes in binary mixtures. The 1-methyl-3-octylimidazolium hexafluorophosphate [OMIM][PF] ionic liquid was used to extract Brilliant Green (BG) and Crystal Violet(CV) dyes from aqueous solutions. The amplitude of the zero crossing first derivative spectra at 670 nm and 532 nm were selected...

In vitro detection of allergen sensitized basophils by HSA-DNP antigen-anchored liquid crystal microdroplets.

A simple and easy to handle biosensing technique for in vitro detection of HSA-DNP antigen induced allergen reactions in patients has been developed through the detection of sensitized basophils expressed with anti-IgE receptor (FcεRI) by using human serum albumin-dinitrophenol (HSA-DNP) antigen-anchored liquid crystal (LC) microdroplets emulsion. The radial to bipolar transition in nematic 4-cyano-4'-pentyl biphenyl liquid crystal molecules (5CB) confined in HSA-DNP antigen anchored LC microdroplets (8.5...

Advances in Computational Studies of the Liquid-Liquid Transition in Water and Water-Like Models.

There has been uninterrupted interest in supercooled water ever since the pioneering experiments of Speedy and Angell revealed sharp increases in this substance's response functions upon supercooling. One intriguing hypothesis that was formulated to explain this behavior involves the existence of a metastable liquid-liquid transition (LLT) at deeply supercooled conditions. The preponderance of experimental evidence is consistent with this hypothesis, although no definitive proof exists to date. Computationa...

Ultrathin uniform platinum nanowires via a facile route using an inverse hexagonal surfactant phase template.

In this paper, we present an attractive method for the fabrication of long, straight, highly crystalline ultra-thin platinum nanowires. The fabrication is simply achieved using an inverse hexagonal (HII) lyotropic liquid crystal phase of the commercial surfactant phytantriol as a template. A platinum precursor dissolved within the cylindrical aqueous channels of the liquid crystal phase is chemically reduced by galvanic displacement using stainless steel. We demonstrate the production of nanowires using the...

Ultrashort polarization beam splitter based on liquid-filled dual-core photonic crystal fiber.

An ultrashort polarization beam splitter (PBS) is proposed based on liquid-filled dual-core photonic crystal fiber (DCPCF). The two cores of DCPCF are formed by two side elliptical holes and a central circular hole in the horizontal direction. The properties of the PBS are analyzed first with a non-filled DCPCF by the finite element method. Then, the performances of the PBS are discussed when the DCPCF is filled with liquids in the central hole. As a result, an ultrashort PBS is realized with a length of 78...

Anisotropic Thermal Interface Materials: Directional Heat Transfer in Uniaxially Oriented Liquid Crystal Networks.

For the development of anisotropic thermal interface materials (TIMs), a rod-shaped reactive monomer PNP-6MA is newly designed and successfully synthesized. PNP-6MA reveals a smectic A (SmA) mesophase between crystalline (K) and isotropic (I) phases. PNP-6MA can be oriented under a magnetic field (B = 2 T), and its macroscopic orientation can be robustly stabilized by in situ polymerization. Even without macroscopic orientations, the fabricated thermal conducting liquid crystal (TCLC) films show the outstan...

Nanohelicoidal Nematic Liquid Crystal Formed by a Non-Linear Duplexed Hexamer.

The twist-bend modulated nematic liquid crystal phase exhibits phenomena of fundamental importance to science; the formation of a helical pitch of nanometre scale in a fluid and the spontaneous breaking of mirror symmetry leading to a quasi-fluid state composed of chiral domains despite being composed of an achiral material. We note that this phase has only been observed for materials with two or more mesogenic units, the manner of attachment between which is always linear. In this communication we report o...

Study on the development of wax emulsion with liquid crystal structure and its moisturizing and frictional interactions with skin.

The moisturizing and frictional interactions between emulsion and skin have a significant influence on the moisturizing efficacy and sensory properties of cosmetics. To deeply understand the interactions, we developed a kind of wax emulsion with liquid crystal structure and studied their interactions with dry, semi-moist and fully-moist skin. The moisturizing interaction was studied by using skin hydration test and tape stripping analysis, and it was found that with the increasing of liquid crystal content ...

27.5  W/m collection efficiency solar laser using a diffuse scattering cooling liquid.

We report a solar pumped solid state laser using a 20 mm long, 3 mm diameter neodymium-doped yttrium aluminum garnet laser rod. This rod was placed in a liquid cooling chamber using a water-white-emulsion-paint mix. This mix provides cooling for the laser crystal and also doubles as a diffuse light scattering liquid. This enhances sunlight scattering and leads to a greater absorption in the laser rod. We numerically model the solar absorption in the laser rod using a ray-tracing model and predict a 2.6 ti...

Local bond order parameters for accurate determination of crystal structures in two and three dimensions.

Local order parameters for the characterization of liquid and different two- and three-dimensional crystalline structures are presented. The order parameters are expressed in terms of the angular correlations between a vector (defined in terms of the spherical harmonics, identifying the local environment around a central particle) and its neighboring vectors. For the three-dimensional systems, we have undertaken simulation of the Lennard-Jones (12-6) particles and metallic systems at the melting temperature...

Utilization and cost of electronic resources in adult cancer center.

This study aims to evaluate the knowledge of healthcare providers and the cost of the current institutional e-resources in an adult oncology setting. To assess the awareness, accessibility, and utilization of the available intranet e-resources, a survey questionnaire was distributed to all oncology healthcare practitioners (physicians, nurses, and pharmacists) in an adult oncology center. The e-resources were divided into two main categories: pre-paid and institution-specific. The cost of the pre-paid e-res...


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