Materials Literature
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Abstract The compatibility behavior of polyetherether ketone (PEEK) with poly(ether sulfone) (PES) has been reexamined using differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and extrudate swell measurements. The blends were prepared by both melt‐blending and solution‐blending techniques. Th…
Two new thermoelectric materials of quaternary bismuth telluride CsPb3Bi3Te8 and CsPb4Bi3Te9 are reported, which are members of a homologous series featuring anionic slabs [PbmBi3Te5 + m]- (m = 1-4) of monotonically increasing thickness.
Computational techniques are used to estimate porous shape memory alloy material behavior in this study. Mesoscale analysis techniques based on a two-dimensional finite element method are used to evaluate a representative volume element (RVE) to determine effective material response. The porous shape memory alloy is d…
We have studied conformational properties of flexible polymers partially confined to narrow pores of different size using configurational biased Monte Carlo simulations under athermal conditions. The asphericity of the chain has been studied as a function of its center of mass position along the pore axis and as a fun…
Abstract Various water‐soluble hyperbranched poly(ester amine)s were synthesized by the direct polyaddition of diamines to diacrylates in the absence of a catalyst. Each diamine contained a secondary amino group and a primary amino group such as 1‐(2‐aminoethyl)piperazine, N ‐methyl‐1,3‐propanediamine, or N ‐ethylethy…
Excitation into the Yb 3+ 2 F 5/2 excited states leads to visible-by-eye green luminescence spanning the spectral region from 490 to 790 nm, with a quadratic power dependence. Optical absorption, luminescence, and excitation spectroscopy as well as pulsed measurements on single-crystal SrCl 2 :Yb(1%), Tb(1%) are used…
The trinuclear copper(II) complex [Cu3(cpse)3(H2O)3]·8.5H2O has been obtained from mononuclear [Cu(Hcpse)2]·H2O {H2cpse = N-[2-hydroxy-1(S)-methyl-2(S)-phenylethyl]-N-methylglycine, threo isomer} and crystallographically characterised. The structure of the compound consists of three CuII atoms, each having distorted s…
Semiconducting Cu 2 O thin films were electrodeposited potentiostatically on Cu and SnO 2 substrates. The deposition kinetics of film growth and the conditions to obtain spotty and uniform Cu 2 O films are studied. X-ray diffraction studies revealed the formation of single phase cubic Cu 2 O films. The effects of depo…
Undoped ZnO and F-doped ZnF x O (1− x ) ( x = 5 at%) films prepared by the spray pyrolysis (SP) technique have been studied using cathodoluminescence imaging and spectroscopy, x-ray diffraction and spectrophotometry. These films, deposited at the optimal substrate temperature ( T s = 450 °C), present a hexagonal close…
This paper has experimentally addressed the determination of the convection coefficient for a nichrome and nickel-titanium (NiTi) shape memory alloy (SMA) wire subjected to constant load, heated by electrical current and cooled by free convection (with the current switched off). The entire cycle of actuation is such t…
We have studied the effect of ultrasound on two different natural macroscopic vermiculite samples from Ojén and Santa Olalla (Spain). We describe the conditions for the preparation of nanometric particles by sonochemistry. Sonication produces not only a delamination effect in the [00l] direction, but also a breaking o…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSize Control of Polyaniline Nanoparticle by Polymer SurfactantDeokgeun Kim, Jinwoo Choi, Jin-Yeol Kim, Yang-Kyoo Han, and Daewon SohnView Author Information Department of Chemistry, Hanyang University, 17 Haengdang Dong, Sungdong Ku, Seoul 133-791, Korea Cite this: Macromolecul…
In the first part of the study, PEG 3400 −Fc linear polymeric chains bearing an electrochemically active ferrocene (Fc) head at their loose end are terminally attached at the gold electrode surface. The surface concentration of grafted polymeric chains is measured electrochemically under good solvent (water) condition…
A series of poly(imidesiloxane) (SIM) copolymers have been synthesized from α,ω‘-aminopropylpoly(dimethylsiloxane) (PDMS) of varying lengths, 2,2-bis(4-[4-aminophenoxyl]phenyl)propane (BAPP), and 4,4‘-oxydiphthalic anhydride (ODPA). In this series, the total composition of PDMS was maintained at 10 wt % with multiple…
Nanometer-size PbS quantum dots have been made by electrodeposition on a Au(111) substrate. The deposited nanocrystals have a flattened cubic shape. We probed the single-electron energy-level spectrum of individual quantum dots by scanning tunneling spectroscopy and found that it deviates strongly from that of spheric…
Abstract To improve the cell compatibility of poly( L ‐lactide‐ co ‐glycolide) (PLGA; 75/25 molar ratio of lactide to glycolide) surfaces, we experimented with physicochemical treatments. Chemical treatments employed 70% chloric acid, 50% sulfuric acid, and 0.5 N sodium hydroxide solutions, and physical methods includ…
The red-emitting nanophosphor Eu:Y 2 O 3 was synthesized using the the microemulsions method. The microemulsion system was composed of petroleum ether (60-80 °C), nonionic surfactants NP 5 /NP 9 , aqueous yttrium nitrate/europium nitrate and ammonium hydroxide solution. The nanoparticles were studied by thermal analys…
A series of Lu 2 O 3 samples doped with Eu was prepared in the form of sintered tablets. The activator concentration was 0.2, 1, 3, 5, 7 and 10% with respect to Lu. Emission spectra excited with light of various energies were taken at liquid nitrogen and room temperature. Excitation spectra of characteristic Eu emissi…
This work demonstrates the feasibility and power of electrophilic substitution on the peripheral carbon atoms of triarylcorroles as a synthetic tool to new derivatives. The large difference in the reactivity of the various carbon atoms on the macrocycle was shown to be of electronic rather than steric origin. A carefu…
We present an experimental study of the motion of a solid sphere falling through a wormlike micellar fluid. While smaller or lighter spheres quickly reach a terminal velocity, larger or heavier spheres are found to oscillate in the direction of their falling motion. The onset of this instability correlates with a crit…