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PubMed Journals Articles About "Transparent Crystals With Ultrahigh Piezoelectricity" RSS

15:49 EST 21st February 2020 | BioPortfolio

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Showing "Transparent crystals with ultrahigh piezoelectricity" PubMed Articles 1–25 of 1,000+

Piezoelectricity in Multilayer Black Phosphorus for Piezotronics and Nanogenerators.

Recently, piezoelectric characteristics have been a research focus for 2D materials because of their broad potential applications. Black phosphorus (BP) is a monoelemental 2D material predicted to be piezoelectric because of its highly directional properties and non-centrosymmetric lattice structure. However, piezoelectricity is hardly reported in monoelemental materials owing to their lack of ionic polarization, but piezoelectric generation is consistent with the non-centrosymmetric structure of BP. Theore...


A review on computer modeling of bone piezoelectricity and its application to bone adaptation and regeneration.

Bone is a hierarchical, multiphasic and anisotropic structure which in addition possess piezoelectric properties. The generation of piezoelectricity in bone is a complex process which has been shown to play a key role both in bone adaptation and regeneration. In order to understand the complex biological, mechanical and electrical interactions that take place during these processes, several computer models have been developed and used to test hypothesis on potential mechanisms behind experimental observatio...

Powerful 3-μm lasers acousto-optically Q-switched with KYW and KGW crystals.

We report, to the best of our knowledge, the first use of KY(WO) and KG(WO) acousto-optical Q-switches in 3-μm powerful lasers. Q-switches of two different designs (normal incidence with antireflection coatings, and Brewster-angle cut crystals) operate in lasers based on Er:YAG, Cr:Yb:Ho:YSGG, and Cr:Er:YSGG laser crystals. Gain and lifetime of laser crystals significantly influence the regime of Q-switched generation. Er:YAG and Cr:Yb:Ho:YSGG lasers deliver pulses with 10.8 mJ and 17.5 mJ energy, respec...


Making Engineered 3D DNA Crystals Robust.

Engineered 3D DNA crystals are promising scaffolds for bottom-up construction of three-dimensional, macroscopic devices from the molecular level. Nevertheless, this has been hindered by the highly constrained conditions for DNA crystals to be stable. Here we report a method to prepare robust 3D DNA crystals by postassembly ligation to remove this constraint. Specifically, sticky ends at crystal contacts were enzymatically ligated, and the covalent bonds significantly enhanced crystal stability, e.g., being ...

Stretchable, transparent and imperceptible supercapacitors based on Au@MnO nanomesh electrodes.

A highly transparent and stretchable electrode based on a Au nanomesh, electrodeposited with a thin layer of MnO2 with a transparency of 84.7% is introduced. The as-prepared transparent, stretchable, and imperceptible supercapacitor (TSPS) exhibits a specific capacitance of 0.53 mF cm-2 and excellent bending stability, together with high stretchability (up to 160% strain).

An approach to high-throughput growth of submillimeter transition metal dichalcogenide single crystals.

High-throughput growth of large size transition metal dichalcogenide (TMD) single crystals is an important challenge for their applications in the next generation electronic and optoelectronic integration devices. Here we report the high-throughput growth of submillimeter monolayer TMD single crystals by two-stage space confined chemical vapor deposition, where the nucleation density of TMD crystals is significantly decreased for the growth of large size monolayer crystals by the space confinement effect. M...

Discrete Lorentz symmetry and discrete spacetime translational symmetry in two- and three-dimensional crystals.

As is well known, crystals have discrete space translational symmetry. It was recently noticed that one-dimensional crystals possibly have discrete Poincar\'{e} symmetry, which contains discrete Lorentz and discrete time translational symmetry as well. In this paper, we classify the discrete Poincar\'{e} groups on two- and three-dimensional Bravais lattices. They are the candidate symmetry groups of two- or three-dimensional crystals, respectively. The group is determined by an integer generator $g$, and it...

Crystal arthropathies.

Crystals are one of the commonest reasons for acute joint inflammation. The most relevant types of crystals are those of monosodium urate (MSU) and calcium pyrophosphates (CPP). To get proven diagnosis of a crystal arthropathy the microscopic identification of those crystals in synovial fluid is still recommended by the actual guidelines. Whenever arthrocentesis is not feasible, ultrasound or dual-energy-computed tomography might help to visualize specific changes induced especially by MSU crystals. Both ty...

Active Phagocytosis and Diachronic Processing of Calcium Oxalate Monohydrate Crystals in an in vitro Macrophage Model.

We previously discovered that renal macrophages (Mφs) phagocytose renal calcium oxalate monohydrate (COM) crystals. This study investigated the processing of engulfed crystals using in vitro models.

Transparent actuator made by highly-oriented carbon nanotube film for bio-inspired optical systems.

Transparent actuator can be used in variable-focus lens, tactical displays and so on. However, previous transparent actuators made with dielectric elastomer mostly required high driving voltages (> 1000 V) for actuation. In this work, we propose a new kind of low-voltage-driven transparent actuator, which is made with polymer and single-layer highly-oriented carbon nanotube (HOCNT) film composites, fully utilizing the favorable conductivity and high transparency of HOCNT film. The HOCNT-based transparent ac...

Rb4Li2TiOGe4O12: A Titanyl Nonlinear Optical Material with Widest Transparency Range.

Practical mid-infrared (MIR) coherent light beams generated by frequency conversion in nonlinear optical (NLO) crystals are indispensable in time-resolved infrared vibrational spectroscopy, remote light detection and ranging, and free space communications. Herein, a new titanyl germanate Rb4Li2TiOGe4O12 (RLTG) MIR NLO crystal was obtained by heavier element substitution. It features a complicated structure network composed of the compressed TiO5 square pyramids and distorted GeO4 tetrahedra, separated by Rb...

A Cross-Linking Approach to Stabilizing Stimuli-Responsive Colloidal Crystals Engineered with DNA.

Two DNA-cross-linking reagents, bis-chloroethylnitrosourea and 8-methoxypsoralen, are used to covalently cross-link interstrand base pairs in DNA bonds that, in part, define colloidal crystals engineered with DNA. The irreversible linkages formed increase the chemical and thermal stability of the crystals and do not significantly affect their long-range order, as evidenced by small-angle X-ray scattering data. The post-modified crystals are stable in environments that the pre-modified structures are not, in...

Quantum Time Crystals from Hamiltonians with Long-Range Interactions.

Time crystals correspond to a phase of matter where time-translational symmetry (TTS) is broken. Up to date, they are well studied in open quantum systems, where an external drive allows us to break discrete TTS, ultimately leading to Floquet time crystals. At the same time, genuine time crystals for closed quantum systems are believed to be impossible. In this study we propose a form of a Hamiltonian for which the unitary dynamics exhibits the time crystalline behavior and breaks continuous TTS. This is ba...

Elastic properties of the molecular crystals of hydrocarbons from first principles calculations.

I studied the elastic properties of oligoacenes and polycyclic aromatic hydrocarbons crystals within the framework of density functional theory with van der Waals interactions. The full sets of elastic constants were computed. The computed parameters have good agreement with experimental data. The study of four forms (α, β, γ and dimeric) demonstrate that the stacking of molecules leads to different character of interaction between molecules. Crystals with dimeric form have lower anisotropy. If symmetry ...

New method for immobilising diverse proteins onto cubic micro-protein polyhedrin crystals.

Cypovirus is an insect virus that is encapsulated in stable cubic protein crystals composed of polyhedrin protein produced in virus-infected cells. Molecular technology developed over the last decade is now able to immobilise proteins of interest on polyhedrin crystals. Modified polyhedrin crystals can be used in cell cultures for implantation in animals and vaccines, among other applications. However, this technique does not work for some proteins. Here, we developed and tested an alternative approach for ...

The role of a transparent cap in the endoscopic removal of esophageal foreign bodies: a propensity score-matched analysis.

This study aimed to investigate the effectiveness and safety of transparent cap-assisted endoscopy in esophageal foreign body removal.

Interaction Screening by Kendall's Partial Correlation for Ultrahigh-dimensional Data with Survival Trait.

In gene expression and genome-wide association studies, the identification of interaction effects is an important and challenging issue owing to its ultrahigh-dimensional nature. In particular, contaminated data and right censored survival outcome make the associated feature screening even challenging.

Prototype Ultrahigh-Resolution Computed Tomography for Chest Imaging: Initial Human Experience.

The objective of this study was to evaluate a prototype, ultrahigh-resolution computed tomography offering higher reconstruction matrix (1024 × 1024) and spatial resolution (0.15 mm) for chest imaging.

Non-contact method of thickness measurement for a transparent plate using a laser auto-focus scanning probe.

In this paper we propose a novel non-contact method of thickness measurement for a transparent plate using a laser auto-focus scanning (LAFS) probe. Through the analysis of the focus error signal (FES) from the actual specimen's upper and lower surface reflectances, a measurement model is introduced to find the best focus position on the corresponding surface of the transparent plate. Thus, the thickness of a specimen can be obtained. Herein, the LAFS probe measurement characteristics by auto-searching the ...

Performance of nearly fixed offset asymmetric channel-cut crystals for X-ray monochromators.

X-ray double-crystal monochromators face a shift of the exit beam when the Bragg angle and thus the transmitted photon energy changes. This can be compensated for by moving one or both crystals accordingly. In the case of monolithic channel-cut crystals, which exhibit utmost stability, the shift of the monochromated beam is inevitable. Here we report performance tests of novel, asymmetrically cut, channel-cut crystals which reduce the beam movements by more than a factor of 20 relative to the symmetric case...

Uncovering the Indium Filament Revolution in Transparent Bipolar ITO/SiOx/ITO Resistive Switching Memories.

Transparent Resistive switching random access memory (ReRAM) is of interest for the future integrated invisible circuitry. However, poor understanding of its working mechanism in transparent ReRAMs with indium tin oxide (ITO) electrode is still a critical problem and will hinder its widespread applications. To reveal the actual working mechanism in transparent ReRAMs with ITO electrode, we investigate the transparent ITO/SiOx/ITO memory devices (~82% transmittance in the visible region) and compare it with ...

Hydrothermal synthesized UV-resistance and transparent coating composited superoloephilic electrospun membrane for high efficiency oily wastewater treatment.

As oily wastewater issues continue to grow, the treatment of oily wastewater has become urgent an emergency. However, present solutions are restricted by the limited performance of materials. An UV-resist and transparent coating consisting of PDMS and ZnO decorated on a highly stable and self-standing polyimide is reported in this work as a potential solution. The obtained fibrous membranes not only allow high-efficiency (higher than 99%) oily wastewater separation but also show superior UV-resistant activi...

Photo-Carrier-Guiding Behavior of Vertically Grown MoS2 and MoSe2 in Highly Efficient Low-Light Transparent Photovoltaic Devices on Large-Area Rough Substrates.

Two-dimensional MoX2 (X = S, Se) films were vertically grown on highly rough transparent conducting F-doped SnO2 glass substrates for the first time and successfully used as photogenerated carrier-guiding layers (CGLs) in transparent hydrogenated amorphous silicon (a-Si:H) thin film solar cells (TFSCs). The MoSe2 CGL layers could be grown at 530 °C using thermally cracked small Se-molecules on transparent FTO glass substrates and significantly improved cell performance. A transparent cell transmitting 26.0...

Photoinduced Bending of Single Crystals of a Linear Bis-Olefin via Water-templated Solid-State 2+2 Photopolymerization Reaction.

The single crystals of two structural isomers of bis-olefinic molecules were shown to have contrasting properties in terms of their photo reactivity, one exhibits excellent ability to form polymers accompanied with bending of crystals upon irradiation while the other is photostable. The photo reactive crystal is a first example in which [2+2] polymerization leads to the bending of the crystals with implications to design of photo-actuators. The hydrate formation ability of one these molecular isomers promot...

Supercompliant and Soft (CH_{3}NH_{3})_{3}Bi_{2}I_{9} Crystal with Ultralow Thermal Conductivity.

In this Letter, we show the phonon dispersion of (CH_{3}NH_{3})_{3}Bi_{2}I_{9} single crystals at 300 K measured by inelastic x-ray scattering. The frequencies of acoustic phonons are among the lowest of crystals. Nanoindentation measurements verified that these crystals are very compliant and considerably soft. The frequency overlap between acoustic and optical phonons results in strong acoustic-optical scattering. All these features lead to an ultralow thermal conductivity. The fundamental knowledge obta...


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