Materials Literature
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Novel type II CdTe−CdSe semiconductor nanocrystal heterostructures (SNCHs) with multiple-branched rod morphology were synthesized by epitaxial growth of CdSe from CdTe nanocrystals in solution, and the SNCHs were characterized by transmission electron microscopy (TEM), high-resolution TEM (HRTEM), energy-dispersive sp…
The vibrational spectra of platinum and rhodium nanoparticles (2.4−7 nm) capped with poly(vinylpyrrolidone) (PVP) were investigated by deep UV−Raman and Fourier transform infrared (FTIR) spectroscopy. Raman spectra of PVP/Pt and PVP/Rh showed selective enhancement of C O, C−N, and CH 2 vibrational modes of the pyrroli…
We study the impact of surface chemistry on the photoluminescence (PL) quantum yield of CdSe core, CdSe/CdS core/shell, and CdSe/CdZnS/ZnS core/shell/shell nanocrystals prepared by multiple synthetic routes. We expose as-synthesized particles to varying concentrations of n-alkylamine and n-alkanethiol ligands and veri…
Shape memory polymers (SMPs) are receiving increasing attention because of their ability to store a temporary shape for a prescribed period of time, and then when subjected to an environmental stimulus, recover an original programmed shape. They are attractive candidates for a wide range of applications in microsystem…
Development of advanced lightweight solar arrays and small satellites requires deployment and release devices to be very small and lightweight. Achieving release requirements through a small size device will face more challenging design problems. The SMA (Shape Memory Alloys) devices designed so far have all been disc…
Small-angle X-ray scattering (SAXS) analysis has been performed on maghemite–poly(4-vinylpyridine) nanocomposites prepared by in situ precipitation from iron–polymer coordination compounds. According to electron microscopy observations, the nanocomposites contain isolated spherical particles with a narrow size distrib…
This paper is concerned about the synthesis of shape memory styrene copolymer and the investigation of the influence of cross-linking degree on its shape memory effect. As one of novel actuators in smart materials, shape memory polymers (SMPs) have been investigated intensively. Styrene copolymer with proper cross-lin…
Nickel thin films (400 nm) were deposited by magnetron sputtering onto fused silica substrates. The effects of argon pressure and substrate temperature (from room temperature to 973 K) upon the film structure were investigated. The film structure was studied using grazing-incidence small-angle X-ray scattering (GISAXS…
Highly concentrated silica suspensions are well-known for their pronounced shear-thickening behavior beyond a certain shear rate or stress, at which a significant and simultaneous increase of the stiffness and damping properties are observed. In the present work, the integration of shear-thickening fluids (STFs) into…
Molecular dynamics simulations of the fragile glass-forming liquid $2\mathrm{Ca}{(\mathrm{N}{\mathrm{O}}_{3})}_{2}∙3\mathrm{K}\mathrm{N}{\mathrm{O}}_{3}$ (CKN) were performed from its molten state at $800\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ down to its glassy state at $250\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Time…
The field of nanotechnology is rapidly maturing into a fertile and interdisciplinary research area from which new sensor and actuator technologies can be conceived. The tools and processes derived from the nanotechnology field have offered engineers the opportunity to design materials in which sensing transduction mec…
In recent years, unrestrained monitoring human posture and action is a field of increasing interest in the welfare of the elderly and the sport-biomechanics. The scope is this study is that we develop a wearable sensing clothes, which can detect entire body posture and motion using a hetero-core optic fiber sensor. Th…
Data from comprehensive thermomechanical tests of shape memory polymers are reported, with specimens tested up to 75% strain and between 30-120°C temperatures. The data is analyzed and key observations are drawn. The stress/strain behavior during loading at temperatures above glass transition for the Veriflex shape me…
Structural polymer composites are susceptible to premature failure in the form of microcracks in the matrix. Although benign initially when they form, these matrix cracks tend to coalesce and lead in service to critical damage modes such as ply delamination. The matrix cracks are difficult to detect and almost impossi…
Nucleation and growth are a basic elementary process of ordering. The nucleation process is controlled by a competition between interfacial and bulk energy. Thus an ordered structure of a nucleus at its birth is not necessarily the most stable thermodynamically: Ostwald step rule. In addition to this, we found the top…
We investigate the influence of the Jahn-Teller distortion and a direct antiferromagnetic moment coupling as extensions to a two-band Kondo lattice model for the magnetic and electronic properties of manganites. Those are calculated self-consistently via an interpolating self-energy model and a modified Ruderman-Kitte…
A 110 kDa (ca. 5 nm in diameter) bivalent paramagnetic nanoprobe for detecting cell death using magnetic resonance imaging (MRI) is described, in which two biotinylated C2A domains of the protein synaptotagmin-I were complexed with a single avidin molecule, which had been labeled with gadolinium chelates. This nanopro…
The ability of conducting polymer actuators to convert electrical energy into mechanical energy is influenced by many factors ranging from the actuators physical dimensions to the chemical structure of the conducting polymer. In order to utilise these actuators to their full potential, it is necessary to explore and q…
Actuation of polypyrrole in aqueous sodium hexafluorophosphate solution has been shown to produce relatively large strains. However little has been published on appropriate potential range of actuation in this electrolyte. This information is clearly crucial for applications. Our particular interest is in disposable a…
Abstract Blends based on ethylene–propylene–diene monomer rubber (EPDM) and acrylonitrile butadiene rubber (NBR) was prepared. Sulfur was used as the vulcanizing agent. The effects of blend ratio on the cure characteristics and mechanical properties, such as stress–strain behavior, tensile strength, elongation at brea…