Materials Literature
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The photoinduced ring-closing reaction in diarylethene, which serves as a model system for understanding reactive crossings through conical intersections, was directly observed with atomic resolution using femtosecond electron diffraction. Complementary ab initio calculations were also performed. Immediately following…
Unlike the conventional synthesis of acrylated soybean oil (ASO) that usually involved several steps, a novel one-step reaction synthesis of ASO was introduced in this study. ASO was prepared directly from the addition reaction of soybean oil (SO) and acrylic acid (AA). Effects of catalyst type, reaction stoichiometry…
The optical spin noise spectroscopy (SNS) is a minimally invasive route towards obtaining dynamical information about electrons and atomic gases by measuring mesoscopic time-dependent spin fluctuations. Recent improvements of the sensitivity of SNS should make it possible to observe higher order spin correlators at th…
In this article we present a novel semi-analytical approach to calculate first-order electron-vibration coupling constants within the framework of density functional theory. It combines analytical expressions for the first-order derivative of the Kohn-Sham operator with respect to nuclear displacements with coupled-pe…
Using density functional theory (DFT) with local density approximation (LDA) and generalized gradient approximation (GGA) correlation functionals, the electronic and magnetic structures of cubic BaFeO$_{3}$ in the ferromagnetic (FM) and antiferromagnetic (AFM) states are studied. Our LDA/GGA and LDA$+U$/GGA$+U$ result…
Recent dramatic progress in studying various two-dimensional (2D) atomic crystals and their heterostructures calls for better and more detailed understanding of their crystallography, reconstruction, stacking order, etc. For this, direct imaging and identification of each and every atom is essential. Transmission elec…
Atom transfer radical polymerization (ATRP) is one of controlled radical polymerization techniques for the synthesis of materials with specific macromolecular structures.Using this technique, one can synthesize monodisperse homopolymer (low polydispersity index), end groups polymers or polymers with functionality in a…
Strain-gradient theories of plasticity have been successful in modeling the behavior of complex materials. However, the traditional formulation of these theories lacks a material length scale, and is thus incapable of capturing experimentally observed size effects that play an important role in the behavior of nano st…
In this fluid dynamics video, we show the spontaneous random motion of thin filaments of a shear-thickening colloidal dispersions floating on the surface of water. The fluid is a dispersion of fumed silica nanoparticles in a low molecular weight polypropylene glycol (PPG) solvent. No external field or force is applied…
采用基团贡献法估算了1, 5-二叠氮基-3-硝基-3-氮杂戊烷(DIANP)的溶解度参数。用浊度滴定法测定了其溶解度参数。研究了DIANP在不同溶剂中的溶解性。结果表明, 基团贡献法的估算值与浊度滴定法的测定值相吻合。测得DIANP的溶解度参数为22.29 (J/mL) 1/2。DIANP在不同溶剂中的溶解性符合“溶解度参数相近相溶”原则。
Abstract To improve the thermal efficiency of fossil running power plants increasing the live steam temperature is essential. In power plant construction, 9-12% chromium martensitic steels are widely used but if steam temperatures rise above 625 °C there is no way around nickel base alloys. The scope of this study was…
It has been related the effect of holding time heating, quenching, and tempering of influence in the leaf spring steel AISI No. 9260. The research was conducted to determine the impact value of leaf springs steel that are usually used on motor vehicles based on the heating, quenching with oil, and tempering to produce…
Abstract A novel method to disperse single-walled carbon nanotubes (SWNTs) in water using self-aggregating peptides was demonstrated. SWNT dispersion was performed by the addition of water to solid mixtures of SWNTs and the peptides, in addition to subsequent sonication processes. Spectroscopic and microscopic analyse…
A new triptycene‐containing dicarboxylic acid monomer was successfully synthesized by refluxing the diamine, bis(4‐aminophenoxy)phenyl triptycene with trimellitic anhydride in glacial acetic anhydride. A series of novel thermally stable poly(ester‐imide)s were prepared from dicarboxylic acid, bis(4‐trimellitimido phen…
This paper reports a medium energy ion scattering study of the room temperature deposition of Fe on the fivefold surface of i-Al70Pd21Mn9. At low coverage (~1 ML) growth results in a disordered alloy film with significant Al content. At higher coverage (~11ML) again an alloy film is formed, but this timewith an averag…
High biocompatibility is a basic requirement in medical technology. Polymer coatings can radically improve medical device biocompatibility, especially for surfaces like stainless steel. Adhesion is an important quality in a coating, and this was our rationale for developing a polymer adhesion testing protocol. We comp…
Characteristic of TiO2 layers which was produced by spray method using airbrush equipment in the Dye-Sensitized Solar Cell (DSSC) were investigated from TiO2 surfaces morphology and I-V characteristics of DSSC. Spray application rate varied into 20, 40, and 60 times. Annealing temperature variation of TiO2 layers for…
This study investigates the application of Plasma-polymerized pyrrole (ppPY) as bioactive platform for DNA immobilization and cell adhesion based on the fundamental properties of ppPY, such as chemical structure, electrochemical property, and protein adsorption. Variations in electrochemical properties of the ppPY fil…
Se reporta la caracterizacion de cuatro ceramicas porosas, C 1 , C 2 , C 3 y C 4 , obtenidas a partir de cuatro espumas de poliuretano utilizadas como matriz E 1 , E 2 , E 3 y E 4 y barbotinas de arcillas rojas como refuerzo. Las espumas se estudiaron con Microscopia Electronica de Barrido SEM, se determino el tamano…
We present an approach to the analysis of mechanisms of the tribological contact of a thin Al 2 O 3 oxide layer formed under hard anodizing conditions on a plate made of the aluminium alloy EN AW-5251. The oxidation of the 50-μm ceramic layer was carried out for 60 min in a three-component electrolyte (SAS), a three-c…