Materials Literature
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Poly(acrylamide‐pyrrole) conducting polymer was prepared by a two‐step aqueous polymerisation. First, the polyacrymide superabsorbent polymer was synthesised by a routine aqueous polymerisation. Second, pyrrole monomers were absorbed inside the polyacrylamide network and followed by a polymerisation to form a poly(acr…
On the basis of the surface grind-hardening experiment, the influence of grinding pass on the microstructure and its uniformity of the grind-hardened layer of 65Mn steel were studied using optical microscope, scanning electron microscope, and digital microhardness tester in detail. The results show that the grind-hard…
Manganite/ferroelectrics heterostructures were formed by growing a La 0.8 Ca 0.2 MnO 3 film on single crystal of ferroelectric 0.72Pb(Mg 1/3 Nb 2/3 )O 3 -0.28PbTiO 3 (PMN-PT). In such heterostructures, the lattice strain can be well controlled by the electric field applied to PMN-PT. Thus the properties of the La 0.8…
Comparative dielectric investigations of bulk barium titanate crystals grown using different techniques have been performed by the thermal noise and traditional methods. The temperature dependences of the permittivity have been used to determine the phase transition temperatures and the Curie-Weiss constants. The inve…
The subject of investigation is poly- N -epoxypropylcarbazole and poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene-vinylene] films with zinc 2,3,9,10,16,17,23,24-octabutylphthalocyanine additives. The photoconducive and photodielectric properties of these heterostructures are studied in the absorption range of the me…
In this paper, the ultrafine grained (UFG) copper achieved by the equal channel angular pressing method was annealed at 473 K for 2 min and compressed at room temperature under quasi‐static loading condition. The experimental results show that virtually no strain hardening is observed after an initial rapid strain har…
Abstract The purpose of this study was to obtain pure nanostructured titanium by drawing at cryogenic temperatures and to investigate its structural and mechanical properties. Titanium rods were obtained by severe plastic deformation under the scheme of upsetting‐extrusion‐drawing. Upsetting and extrusion were perform…
S‐J Kima, H N Hana, H‐T Jeongb & D N Lee*aa Department of Materials Science and Engineering and RIAM, Seoul National University, Seoul 151‐744, Koreab Department of Metals and MaterialsGangneung‐Wonju National University, Gangneung 210‐702, Korea*Corresponding author, email dnlee@snu.a.krAbstractTexture studies of sil…
An experimental setup has been designed and built for measuring the Seebeck coefficient of bulk thermoelectric materials, thin films, and nanowire composites in the temperature range 200–350 K. The setup utilizes a differential method for measuring the Seebeck coefficient of the sample. The sample holder is a simple c…
In this research, we present a facile, effective and green route for the synthesis of well-defined spherical lead sulfide (PbS) quantum dots (QDs) through the reaction between lead nitrate and sodium sulphide by virtue of its strong reduction and selective interaction abilities without using any surfactant, and evalua…
Les fontes au chrome sont bien connues pour leurs propriétés à l’usure. Elles sont utilisées dans les domaines miniers, cimentiers ainsi que tant d’autres. Leurs facultés de résister à l’usure sont principalement dues à leur microstructure qui est constituée d’un réseau de carbure eutectique du type M7C3 contenu dans…
We study nonreciprocity effects that manifest themselves as a difference of transmissive and reflective optical properties for waves of the same polarization that are incident at the angles φ and -φ on a bilayer ferromagnetic structure with noncollinear orientation of the magnetization vectors of the layers in the pla…
The heat capacity of rapidly quenched lithium borate glass was measured by a relaxation method between 2 K and 300 K to clarify the origin of a boson peak. The boson peak of lithium borate glass was also studied by Raman scattering measurements. Upon increasing the lithium composition, the peak value of C(subscript p)…
For ranking a high-tech object to a class “advanced ,” both the object and scope of its potential application should be defined in terms of relevant characteristics and criteria. The elaboration of required criteria might speed up the technological progress. The ultimate physical limit approach is applied to the case…
This paper summarizes our recent research on carbon nanoparticles (fullerenes, nanotubes, nanodiamonds) as substrates for the adhesion, growth and phenotypic maturation on osteogenic cells
We review the results of growing few layer graphene on alpha-SiC with different surface orientations. To this end we have used successively a pure {000-1} C face, a 8 degrees-off one, a nonpolar {11-20} surface and, finally, a 8 degrees-off Si face and a pure (exactly {0001}-oriented) Si one. Without any need for comp…
Polymeric nanocarriers possess advanced physicochemical properties that improve bioavailability, enhance cellular dynamics, and control target ability in drug delivery. In particular, dendritic polyglycerol is a promising new biocompatible scaffold for drug delivery. The present study explores the chemo-enzymatic modi…
Phonon confinement effects are studied in self-assembled close-packed CdS and CdSe colloidal quantum dots using Raman scattering techniques. The longitudinal optical phonon frequency exhibits a red shift compared to the bulk mode in CdS quantum dot due to phonon confinement. High frequency phonon modes that are above…
The optical conductivity of the III–V diluted magnetic semiconductor compound (Ga, Mn)As was investigated theoretically. A direct comparison between the calculations and available experimental data is provided. We demonstrate that our model study is able to reproduce both qualitatively and quantitatively the measureme…
Abstract To realize the high‐valued application of waste tire rubber (WTR), hyperbranched poly(amidoamine) (PAMAM) were synthesized from the surface of WTR powders to endow its chemical reactivity. The hyperbranched PAMAM‐grafted WTR powders containing a large amount of amine groups on their surface were obtained thro…