Materials Literature
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We have fabricated carbon nanotube and MoS 2 field-effect transistors with asymmetric contact forms of source–drain electrodes, from which we found the current directionality of the devices and different contact resistances under the two current directions. By designing various structures, we can conclude that the asy…
Abstract We propose and study a kind of bilayered chiral metasurface (BCM) composed of complementary L-shaped resonators with a lossless dielectric spacer that can realize linear polarization rotation with ultrahigh conversion efficiency. We present a theoretical analysis of the BCM with specific chiral geometry that…
A theory is developed to describe the coupled transport of energy and charge in networks of electron donor-acceptor sites which are seated in a thermally heterogeneous environment, where the transfer kinetics are dominated by Marcus-type hopping rates. It is found that the coupling of heat and charge transfer in such…
The 2,7- and 3,6-substituted carbazole and triphenylamine chalcogenophene (Se, Te) derivatives and their electrodeposited polymers are investigated using electrochemical and UV–vis–NIR/ESR spectroelectrochemical methods. Major differences in the case of oxidation and electropolymerization behavior between monomers and…
Abstract The low in vivo survival rate of scaffold-seeded cells is still a challenge in stem cell-based bone regeneration. This study seeks to use a silk hydrogel to deliver more stem cells into a bone defect area and prolong the viability of these cells after implantation. Rat bone marrow stem cells were mingled with…
Long chain polyamides with various number of methylene units in recurring amide groups, PA1012 and PA612, were blended to combine their unique advantages. The Brill transition and accompanied lamellar thickening were investigated by in situ wide angle X-ray scattering (WAXS) and small angle X-ray scattering. From WAXS…
Abstract Numerous studies in biological and material sciences have used nitro‐BIPS, dinitro‐BIPS as well as Py‐BIPS as versatile photoswitches. Still, the photochemical picture of this class of compounds is far from complete. We present photometric steady‐state and ultrafast time‐resolved pump/probe spectroscopic meas…
Significance Using neutron powder diffraction measurements on the bulk highest- T c superconductor 154 SmFeAsO 1− x D x , we discovered a new antiferromagnetic (AFM) phase in the electron-overdoped regime, x ≥ 0.56 (AFM2). The magnetic moment on Fe in AFM2 reaches 2.73 μ B /Fe, which is the largest in all the nondoped…
This paper presents an optimal design method for electromagnetic cloaks composed of multiple dielectric materials based on a topology optimization. To obtain optimal configurations that are perfectly free from intermediate materials, so-called grayscales, we apply a Multi-Material Level Set topology description model.…
Here reported is the approach to prepare the tunable 3D architecture and patterning through photoinduced orientation of azopolymer. The hemispherical PAzoMA array can be transformed into spindlelike, flat ellipsoidlike, thick spindlelike, near-hexagon, near-quadrangle, and near-rhombus arrays while being exposed to li…
Stimuli-responsive assembly of gold nanoparticles (AuNPs) with precise control of the plasmonic properties, assembly size, and stimuli responsivity has shown potential benefits with regard to biosensing devices and drug-delivery systems. Here we present a new pH-responsive coassembly system of oligo(ethylene glycol) (…
The 40 years old GSI-UNILAC (Universal Linear Accelerator) as well as the heavy ion synchrotron SIS18 will serve as a high current heavy ion injector for the new FAIR (Facility for Antiproton and Ion Research) synchrotron SIS100. In the context of an advanced machine investigation program in combination with the ongoi…
Since 2004 the field of graphene research has attracted increasing interest worldwide. Especially the integration of graphene into microelectronic devices has the potential for numerous applications. Therefore, we summarize the current knowledge on this aspect. Surveys show that considerable progress was made in the f…
Abstract Herein we report the observation of room‐temperature phosphorescence from carbon dots (CDs) embedded in aluminium sulfate. Phosphorescence emission in CDs was achieved by incorporating C=O/C=N functionalities on the carbon dots (CDs) in a single‐step reaction. Benzene‐1, 3, 5‐tricarboxylic acid and formamide…
Silver has been widely used as an effective antibacterial agent especially for treating burns and wounds. However, release of silver from materials often arouse side effects due to toxicity of silver towards mammalian cells. Argyria and argyrosis are well known problems of acute toxicity of silver towards human body.…
Atomic structure of amorphous silicon consistent with several reported experimental measurements has been obtained from annealing simulations using electron density functional theory calculations and a systematic removal of weakly bound atoms. The excess energy and density with respect to the crystal are well reproduc…
Helical self‐assembly plays a unique role in regulating the localized excitations of π functional systems, which can also bring highly multi‐scale orders, and show a special effect to tune the energy of electronics, vibration, and rotation of molecules. Due to controllable and dynamic property of chiral self‐assembly,…
Is your phone's screen cracked, or your car's windshield? Making tougher glass is an important challenge for applications. It is known that modifying the structure of an amorphous solid at high pressure and temperature yields properties unattainable under normal conditions, but deeper physical insight is crucial for d…
Ballistic electrons in solids can have mean free paths far larger than the smallest features patterned by lithography. This has allowed development and study of solid-state electron-optical devices such as beam splitters and quantum point contacts, which have informed our understanding of electron flow and interaction…
The charge distribution, molecular structure, and morphological packing significantly affect the photophysical properties of organic photoluminescent materials. In this work, two triphenylpyrrole isomers, 1,2,5- (TPP1) and 1,3,4- (TPP2), were first synthesized and characterized. Because of their different substituent…