Materials Literature
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Nanoparticles (size 20, 40 and 60 nm) of Pr_0.5Sr_0.5MnO_3 are prepared by sol-gel technique and their magnetic properties are studied using ferromagnetic resonance and magnetization measurements. A comparison with the properties of the bulk material shows that the ferromagnetic transition at 265 K remains unaffected…
We report observation of crystallization of the glass-forming binary Lennard-Jones liquid first used by Wahnström [G. Wahnström, Phys. Rev. A 44, 3752 (1991)]. Molecular dynamics simulations of the metastable liquid on a timescale of microseconds were performed. The liquid crystallized spontaneously. The crystal struc…
Based on the formalism developed by Psarobas et al [Phys. Rev. B 62, 278(2000)], which using the multiple scattering theory to calculate properties of simple phononic crystals, we propose a very simple method to study the NaCl-type phononic crystal. The NaCl-type phononic crystal consists of two kinds of non-overlappi…
Carbon nanotubes (CNTs) demonstrate extraordinary properties and show great promise in enhancing out-of-plane properties of traditional polymer composites and enabling functionality, but current manufacturing challenges hinder the realization of their potential. This paper presents a method to fabricate multifunctiona…
The mineral in bone is located primarily within the collagen fibril, and during mineralization the fibril is formed first and then water within the fibril is replaced with mineral. The collagen fibril therefore provides the aqueous compartment in which mineral grows. Although knowledge of the size of molecules that ca…
Size and morphology controlled NaYF 4 :Yb, Er nanocrystals were synthesized via the hydrothermal method. Polydentate ligands, such as EDTA and citrate, were used in the synthesis of cubic and hexagonal Yb 3+ , Er 3+ codoped NaYF 4 nanocrystals as a means of controlling the size and morphology of the nanocrystals. Subs…
Spider dragline (major ampullate) silk outperforms virtually all other natural and manmade materials in terms of tensile strength and toughness. For this reason, the mass-production of artificial spider silks through transgenic technologies has been a major goal of biomimetics research. Although all known arthropod si…
Nanoparticles (NPs) decorated with ligands combining photoswitchable dipoles and covalent cross-linkers can be assembled by light into organized, three-dimensional suprastructures of various types and sizes. NPs covered with only few photoactive ligands form metastable crystals that can be assembled and disassembled "…
Novel polyazomethines containing triphenylamine structure in the main chain have been prepared on a way of polycondensation of 4,4′-diformyltriphenylamine with aromatic diamines in HMPT solution with the goal to study interactions between polymer chain (Ps) and dopant (methanesulfonic acid: MSA, m-cresol: MC and p-chl…
Abstract High power ultrasound treatment of ethylene propylene diene monomer (EPDM) gum in extrusion process was found to affect its structure and properties. In comparison with the original EPDM gum, the ultrasonically treated samples were found to contain some amount of gel with sol having a higher molecular weight,…
From first-principles density-functional theory calculations, we show that above a given hydrostatic pressure, an unstable TO mode appears in the cubic perovskite barium stannate $(\mathrm{Ba}\mathrm{Sn}{\mathrm{O}}_{3})$ at $\ensuremath{\Gamma}$. Below this critical pressure, we predict an interesting lowering of the…
Molecular dynamics (MD) simulations using empirical force fields are popular for the study of proteins. In this work, we compare anisotropic atomic fluctuations in nanosecond-timescale MD simulations with those observed in an ultra-high-resolution crystal structure of crambin. In order to make our comparisons, we have…
Abstract An investigation of the factors influencing the degree of exfoliation of an organically modified clay in a series of epoxy resins is reported. The use of sonication, choice of curing agent, effect of the moisture content of the clay, and the cure temperature were examined. The dispersion was characterized usi…
Abstract This paper introduces an electroactive paper (EAPap) prepared with cellulose and chitosan films. The fabrication process, performance test, and the effect of acetic acid dosage of the EAPap were investigated. For the fabrication of cellulose EAPap, cellulose fibers were dissolved into a solution using N , N ‐…
Optical characteristics of ZnxMg1−xO, ZnO:Al, and ZnO epilayers are investigated. At pulse laser pumping, stimulated emissions are observed in these epilayers. Among them, spectral blueshifts are dependent on the Mg substitution concentration, and the highest lasing photon energy of 3.51eV ever reported is observed in…
Long range 1:1 cation order was developed in Pb(Fe2(1−x)∕3Sc2x∕3W1∕3)O3 solid solution compounds by high temperature solid state reaction. It is found that the degree of cation order directly influences the saturation magnetization in these single phase compounds. A high saturation magnetization (∼0.61μB∕f.u.) was obs…
An ion implanted Mn–Ge(100) alloy has been fabricated with a 30nm subsurface layer of disorderly diluted Mn atoms, which settle all in substitutional lattice sites after 400°C annealing in vacuum. The Mn L2,3 x-ray absorption spectroscopy of the disordered Mn implanted alloy is featureless, while the one taken on the…
We present heat capacity measurements on crystalline Zn nanowires with diameters of 230 and 23 nm, bracketing the superconducting coherence length of 155 nm. Transport measurements on superconducting nanowires have found a crossover from three-dimensional to one-dimensional behavior as the wire diameter was reduced be…
Si nanocrystals with face-centered-cubic (fcc) structure were fabricated using common sputtering technique, but applying bias on the substrate, the thermodynamic calculation indicates that the bombardment of Ar+ ions arising from the bias should be responsible for the crystallization and phase transition of Si nanocry…
It is well accepted that the adventitia is much more than a simple elastic membrane which surrounds the media. However, the extent of its contribution to vascular physiology, as well as the mechanisms involved, remains to be clearly established and characterised. Investigation into these topics is hampered by a few te…