Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSwelling and Shrinkage of Lamellar Domain of Conformationally Restricted Block Copolymers by Metal ChlorideDong Hyun Lee, Hwang Yong Kim, Jin Kon Kim, June Huh, and Du Yeol RyuView Author Information National Creative Research Cente…
Abstract Rheology of HDPE/maple formulations with two common lubricating systems was studied with the capillary rheometry and the small‐amplitude oscillatory shear experiments. Shear and extensional flow data in the capillary dies revealed different lubricating roles of the additives. Small‐amplitude oscillatory tests…
A systematic study of the surface forces between a cellulose sphere and cellulose thin films of varying crystallinity has been conducted as a function of ionic strength and pH. Semicrystalline cellulose II surfaces and amorphous cellulose films were prepared by spin-coating of the precursor cellulose solutions onto ox…
We describe an electrochemical method of directly growing conducting polymer nanostructures between metal electrodes with the geometry controlled by hydrophilic/hydrophobic patterns. The surface patterning can be achieved by a large number of lithographic methods such as AFM, electron-beam, elastomeric microprinting,…
Highly efficient lasing action is obtained by exploiting the chiroptical characteristics of the ground and excited states of an achiral fluorescent dye doped in a cholesteric liquid crystal (CLC) medium (see figure). The highly efficient lasing action from the oblique dye-doped CLC cell is produced by tuning the ellip…
LaSr 3 Fe 3 - y Co y O 10 - δ (0 ≤ y ≤ 1.5) oxides with a perovskite-related intergrowth structure have been investigated as cathode materials for oxygen reduction reaction in intermediate temperature solid oxide fuel cells (SOFC). The electrical conductivity, oxygen vacancy concentration, and thermal expansion coeffi…
This paper describes the formation of a porous silver surface by a convenient two-step process involving electrochemical formation of a binary silver-zinc alloy film on a silver surface followed by electrochemical etching of the zinc from the alloy. Both the deposition and the dealloying steps were performed in a sing…
The seeder of the pack: The electrical potential distribution (see phase image of an electron hologram) around the basal plane close to the prism faces of a hexagonal fluorapatite–gelatine nanocomposite seed influences the growth of the nanocomposite. The seed consists of elementary dipoles on the nanometer scale, whi…
Abstract Cylindrical starch foam shapes were produced on a small scale (∼11–12 kg/hr) Werner Pfleiderer ZSK‐30 twin‐screw extrusion (TSE) process using water, which functions as a plasticizer as well as a blowing agent. The properties of the starch foams depend on the type of starch used (hydroxypropylated high amylos…
Amorphous ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ model structures are theoretically generated at the atomistic level, and their structural, electronic, and dielectric properties are investigated by first-principles calculations. Results show that the model structures have Al atoms having lower coordination numbers than t…
The polycarbonates, intrinsically rather flame retardant, have been further flame retarded with various bromoaromatic additives, such as tetrabromobisphenol-A polycarbonate. Other bromine additives used include brominated epoxy condensates and brominated polystyrenes. Sodium or potassium sulfonates, such as potassium…
In this work, we address modal parameter fluctuations in statistical distributions describing charge-to-breakdown $(Q_{BD})$ and/or time-to-breakdown $(t_{BD})$ during the dielectric breakdown regime of ultra-thin oxides, which are of high interest for the advancement of electronic technology. We reobtain a generalize…
A concept for the fabrication of highly symmetric quantum dots that are coherently embedded in a single crystalline matrix is demonstrated. In this approach, the formation of the quantum dots is induced by a transformation of an epitaxial 2D quantum well into an array of isolated precipitates with dimensions of about…
We report on the recording of 3D optical memories in sol-gel materials by using a non-linear absorption effect. This effect induces a local change of the optical properties of the material which is read and quantified with a high resolution full-field Optical Coherence Tomography setup. It is the first time that this…
In the last years, important non-linear optical results on sol-gel and polymeric materials have been reported, with values comparable to those found in crystals. These new materials contain push-pull chromophores either incorporated as guest in a high Tg polymeric matrix (doped polymers) or grafted onto the polymeric…
We theoretically investigate impurity correlation and magnetic clustering effects on the long-range ferromagnetic ordering in diluted magnetic semiconductors, such as $\textrm{Ga}_{1-x}\textrm{Mn}_{x}\textrm{As}$, using analytical arguments and direct Monte Carlo simulations. We obtain an analytic formula for the ferr…
Some characterization and microstructural features of mechanochemicaly milled ZnO powders are presented in this study. It is shown that the application of mechanochemical ZnO nanoparticles is a simple technique for preparation of nanocrystalline powders. Synthesised powders are analyzed by X-ray diffraction, scanning…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTConvergent Synthesis of Symmetrical and Unsymmetrical PAMAM DendrimersJae Wook Lee, Byung-Ku Kim, Hee Joo Kim, Seung Choul Han, Won Suk Shin, and Sung-Ho JinView Author Information Department of Chemistry, Dong-A University, Hadan-2-dong, Busan 604-714, Korea, and Department of…
In situ Raman spectroscopy allows for a detailed and time-resolved investigation of the kinetics of complex physical or chemical processes. Oxidation has become a frequently used method for the removal of disordered carbon species from carbon nanotubes. Oxidation, however, can also induce damage to the tubes and destr…
Confinement alters the energy landscape of nanoscale magnets, leading to the appearance of unusual magnetic states, such as vortices, for example. Many basic questions concerning dynamical and interaction effects remain unanswered, and nanomagnets are convenient model systems for studying these fundamental physical ph…