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PubMed Journals Articles About "Transparent Crystals With Ultrahigh Piezoelectricity" - Page: 3 RSS

01:27 EDT 1st April 2020 | BioPortfolio

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Showing "Transparent crystals with ultrahigh piezoelectricity" PubMed Articles 51–75 of 1,000+

Fabrication of Large Single Crystals for Pt-Based Linear Polymers with Controlled-Release and Photoactuator Performance.

Preparation of large single crystals for linear polymers that are amenable to X-ray analysis is very challenging in polymer science. Herein, we employed a coordination driven self-assembly strategy to secure appropriate head-to-tail alignment of anthracene moieties, and for the first time obtained large-sized Pt-based linear polymer crystals through a [4+4] cycloaddition of anthracene in a single-crystal to single-crystal fashion. Using X-ray diffraction analysis to precisely determine polymer crystal struc...


Structural modification of transparent materials with band gap by laser radiation at the absorption edge.

The problem of control over the process of structural modification of transparent materials by laser radiation is currently of great practical interest. This work proposes a novel method of controllable modification of a material structure, using laser pulses with wavelength at the material fundamental absorption edge. The method is based on the effect of thermal shift of the semiconductor absorption edge. The structure is modified by local heating of the material with laser pulses focused inside a transpar...

AgNWs/AZO Composite Electrode for Transparent Inverted ZnCdSeS/ZnS Quantum Dot Light-Emitting Diodes.

Fully transparent inverted quantum dot light-emitting diodes (QLEDs) were fabricated by incorporating a Ag-nanowire-based anode. Aluminum-doped zinc oxide (ZnO:Al, AZO) was inserted by atomic layer deposition and reduced the sheet resistance by promoting adhesion of Ag nanowires (AgNWs) film and increasing its chemical stability towards oxygen. The performance of the QLEDs was optimal when the thickness of AZO was 20 nm. The current efficiency of the fully transparent inverted QLED integrated with the AgNWs...


Spontaneous Creation of Anisotropic Polymer Crystals with Orientation-Sensitive Birefringence in Liquid Drops.

It remains a grand challenge to prepare anisotropic crystal superstructures with sensitive optical properties in polymer science and materials field. This study demonstrates that semicrystalline polymers develop into anisotropic hollow spherulitic crystals spontaneously at interfaces of liquid drops. In contrast to conventional spherulites with centrosymmetric optics and grain boundaries, these anisotropic spherulitic crystals have vanished boundary defects, tunable aspect ratios, and noncentrosymmetric, or...

Extraordinary polarization rotation of vector beams with high-period-number chiral photonic crystals.

We demonstrate by theory and experiments that well-aligned cholesteric liquid crystals that function as 1D chiral photonic crystals (CPCs) having extraordinarily large-period-numbers N (N=d/Λ; d: thickness, Λ: grating period) exceeding 500 possess many optical properties that are impossible with conventional thin CPCs. Even far from the circular Bragg resonance, these CPCs are capable of simultaneously high transmission and large broadband polarization rotation of vector beams; the polarization rotation i...

Global Performance Indices for Dynamic Crystals as Organic Thermal Actuators.

Crystal adaptronics is an emergent materials science discipline at the intersection of solid-state chemistry and mechanical engineering that explores the dynamic nature of mechanically reconfigurable, motile, and explosive crystals. Adaptive molecular crystals bring to materials science a qualitatively new set of properties that associate long-range structural order with softness and mechanical compliance. However, the full potential of this class of materials remains underexplored and they have not been co...

Lithium niobate-based transparent ultrasound transducers for photoacoustic imaging.

This Letter demonstrates lithium niobate (LiNbO)-based transparent ultrasound transducers (TUTs) for photoacoustic imaging applications. The TUTs were fabricated by coating the top and bottom surfaces of a 0.25 mm thick LiNbOwafer with transparent indium-tin-oxide (ITO) electrodes. The resulting transducers showed ∼80% optical transparency in the wavelength range of 690-970 nm. The TUTs had a resonant frequency of 14.5 MHz and ∼70% photoacoustic bandwidth. The versatility of the TUT approach is demon...

Ag-fiber/graphene hybrid electrodes for highly flexible and transparent optoelectronic devices.

Transparent conducting electrodes (TCEs) have attracted considerable attention towards the development of flexible optoelectronic devices. In this study, mixed-dimensional TCEs are fabricated based on the two-dimensional graphene and one-dimensional electrospun metal fiber that can address the shortcomings of each electrode. In comparison with other TCEs, the Ag fiber/graphene hybrid electrodes exhibited a highly stable morphology (67% lower peak-to-valley ratio), low sheet resistance (approximately 11 Ω/s...

Colloidal networks of fat crystals.

The following paper traces the development of the study of colloidal networks of fat crystals. The work starts with traditional pre-fractal particle network models of fat crystal networks. Due to its central importance in the study of colloidal networks of fat crystals (and other colloidal aggregates), a short exposition of fractal geometry is provided. The development of fractal aggregation models as well as models that describe the rheology of networks of these fractal aggregates is introduced. Later sect...

Versatile transmission/reflection tomographic diffractive microscopy approach.

Tomographic diffractive microscopy (TDM) has gained interest in recent years due to its ability to deliver high-resolution, three-dimensional images of unlabeled samples. It has been applied to transparent samples in transmission mode, as well as to surface studies in reflection mode. Mudry et al. [Opt. Lett.35, 1857 (2010)OPLEDP0146-959210.1364/OL.35.001857] introduced the concept of mirror-assisted TDM (MA-TDM), an elegant approach for achieving quasi-isotropic-resolution microscopic imaging, but which is...

Amorphous Solid Dispersions Containing Residual Crystallinity: Influence of Seed Properties and Polymer Adsorption on Dissolution Performance.

The solubility advantage of amorphous solid dispersions (ASDs) is contingent upon supersaturation being generated and maintained. If crystals are present within an ASD, these crystals directly result in lost solubility advantage, and may also seed crystal growth leading to desupersaturation. The goal of this study was to evaluate the impact of residual crystals on ASD supersaturation profiles. Indomethacin-copovidone (PVPVA) ASDs with different levels of residual crystallinity were manufactured by hot melt ...

Novel preclinical PET geometrical concept using a monolithic scintillator crystal offering concurrent enhancement in spatial resolution and detection sensitivity: a simulation study.

We propose a small-animal PET scanner design combining two sets of monolithic crystals with two different thicknesses. The detectors with thinner crystals serve for high resolution imaging while the thicker crystals retain the detection efficiency. Two small-animal PET models based on 10 and 12 detector blocks made of monolithic LYSO crystals were implemented in the GEANT4 Monte Carlo toolkit. In each of these models, half of the detector blocks consisted of a crystal thickness of 10 mm whereas the second h...

Impact of the Spatial Organization of Bifunctional Metal-Zeolite Catalysts for Hydroisomerization of Light Alkanes.

To improve the product selectivity by controlling the spatial organization of functional sites at nanoscale is a critical challenge in bifunctional catalysis. Herein, we design a series of composite bifunctional catalysts consisting of one-dimensional zeolites (ZSM-22 and mordenite) and γ-alumina binder, with platinum particles controllably deposited either on the alumina binder or inside the zeolite crystals. The hydroisomerization of n-heptane demonstrates that the bifunctional catalysts with platinum pa...

Ultrahigh-Q toroidal dipole resonance in all-dielectric metamaterials for terahertz sensing.

By arranging two pairs of high-index dielectric disks into a unit cell, a novel, to the best of our knowledge, terahertz metamaterials sensor integrated with a microfluidic channel is proposed. With the introduction of a new way of symmetry breaking in the unit cell, the strong toroidal dipole response with ultrahigh-Q is excited and investigated, which is related to the existence of the trapped mode. The simulation results show that the calculated quality factor and the corresponding figure of merit (FoM) ...

Three-dimensional crystals of adaptive knots.

Starting with Gauss and Kelvin, knots in fields were postulated to behave like particles, but experimentally they were found only as transient features or required complex boundary conditions to exist and could not self-assemble into three-dimensional crystals. We introduce energetically stable, micrometer-sized knots in helical fields of chiral liquid crystals. While spatially localized and freely diffusing in all directions, they resemble colloidal particles and atoms, self-assembling into crystalline lat...

Transparent layer constancy is improved by motion, stereo disparity, highly regular background pattern, and successive presentation.

The visual system uses figural and colorimetric regularities in the retinal image to recognize optical filters and to discern the properties of the transparent overlay from properties of the background. Previous work suggests that the perceived color and transmittance of the transparent layer vary less under illumination changes than it would be expected from corresponding changes in the input. Here, we tested how the degree of this approximate transparent layer constancy (TLC) depends on factors that presu...

Mechanistic explanation of the (up to) 3 release phases of PLGA microparticles: Diprophylline dispersions.

The aim of this study was to better understand the root causes for the (up to) 3 drug release phases observed with poly (lactic-co-glycolic acid) (PLGA) microparticles containing diprophylline particles: The 1 release phase ("burst release"), 2 release phase (with an "about constant release rate") and 3 release phase (which is again rapid and leads to complete drug exhaust). The behavior of single microparticles was monitored upon exposure to phosphate buffer pH 7.4, in particular with respect to their drug...

Atomic-level handedness determination of chiral crystals using aberration-corrected scanning transmission electron microscopy.

Handedness or chirality determination is a challenging and important topic in various fields including chemistry and biology, as two enantiomers have the same composition and mirror symmetry related structures, but might show totally different activities and properties in enantioselective separations, catalysis and so on. However, current methods are unable to reveal the handedness locally of a nanocrystal at the atomic-level in real-space imaging due to the well-known fact that chiral information is lost i...

Influence of temperature fluctuations on growth and recrystallization of ice crystals in frozen peeled shrimp (Litopenaeus vannamei) pre-soaked with carrageenan oligosaccharide and xylooligosaccharide.

Temperature fluctuation is a common problem in the frozen storage of shrimp products. This study investigated the influence of carrageenan oligosaccharide (CO) and xylooligosaccharide (XO) on the growth and recrystallization of ice crystals in frozen peeled shrimp exposed to temperature fluctuations. Shrimp soaked with water and 3.0% (w/v) NaPO solution were designated as the negative and positive controls, respectively. Our data revealed that both CO- and XO-soaked shrimp had significant improvements in th...

Metal-like ductility in organic plastic crystals: Role of molecular shape and dihydrogen bonding interactions in aminoboranes.

Ductility, which is a common phenomenon in many metals, is hard to achieve in molecular crystals. Organic crystals have been recently shown to bend plastically on one or two face specific directions, but they fracture when stressed in any other arbitrary directions. Here, we report an exceptional metal-like ductility and malleability in crystals of two globular molecules, BH 3 NMe 3 and BF 3 NMe 3 , with characteristic tensile stretching, compression, twisting and thinning (increase of width over 500%). Sur...

Probing Effective Out-of-Plane Piezoelectricity in van der Waals Layered Materials Induced by Flexoelectricity.

Many van der Waals layered 2D materials, such as h-BN, transition metal dichalcogenides (TMDs), and group-III monochalcogenides, have been predicted to possess piezoelectric and mechanically flexible natures, which greatly motivates potential applications in piezotronic devices and nanogenerators. However, only intrinsic in-plane piezoelectricity exists in these 2D materials and the piezoelectric effect is confined in odd-layers of TMDs. The present work is intent on combining the free-standing design and p...

Crystal-to-Crystal Isomerization via Drastic Intramolecular Ligand Exchange: Vapochromism of a Bis(arenethiolato)cobalt(II) Complex Containing Bulky Acylamino Groups.

Crystal-to-crystal transitions normally avoid drastic configurational changes that result in loss of crystallinity. A cobalt(II) complex, containing two unsymmetrically disubstituted arenethiolato ligands with bulky acylamino (ArCCONH, Ar = 4-BuCH) and BuCONH groups, showed crystal-to-crystal configurational isomerization accompanied by vapochromism. Recrystallization using THF/-hexane afforded green crystals (isomer ) containing one -hexane molecule per asymmetric unit. In contrast, blue crystals (isomer )...

Do oncology researchers adhere to reproducible and transparent principles? A cross-sectional survey of published oncology literature.

As much as 50%-90% of research is estimated to be irreproducible, costing upwards of $28 billion in USA alone. Reproducible research practices are essential to improving the reproducibility and transparency of biomedical research, such as including preregistering studies, publishing a protocol, making research data and metadata publicly available, and publishing in open access journals. Here we report an investigation of key reproducible or transparent research practices in the published oncology literatu...

Photo-exfoliation of a highly photo-responsive two-dimensional metal-organic framework.

When exposed to UV (365 nm, 2 mW) radiation, the bulk crystals of a two-dimensional metal-organic framework [Hphen]2[(UO2)2(ox)3] (1,phen = 1,10-phenanthroline, ox = oxalate) are exfoliated into thin sheets (2 μm) and its photoluminescence can be quenched in an incredibly sensitive manner, setting 1 as a superior UV-detection material. When upgrading the UV source into a 300 W xenon light source, the crystals of 1 can be further exfoliated into monolayer nanosheets (0.92 nm).

Lipidomic characterization of exosomes isolated from human plasma using various mass spectrometry techniques.

Ultrahigh-performance supercritical fluid chromatography - mass spectrometry (UHPSFC/MS), ultrahigh-performance liquid chromatography - mass spectrometry (UHPLC/MS), and matrix-assisted laser desorption/ionization (MALDI) - MS techniques were used for the lipidomic characterization of exosomes isolated from human plasma. The high-throughput methods UHPSFC/MS and UHPLC/MS using a silica-based column containing sub-2 μm particles enabled the lipid class separation and the quantitation based on exogenous cl...


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