Materials Literature
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In contrast to all known shape memory polymers, the melting temperature of crystals in shape memory natural rubber (SMNR) can be greatly manipulated by the application of external mechanical stress. As shown previously, stress perpendicular to the prior programming direction decreases the melting temperature by up to…
The miscibility of polyethylene terephthalate (PET)/polylactide (PLA) blends is studied through atomistic molecular dynamics (MD) and mesoscale dissipative particle dynamics (DPD) simulation. Five PET/PLA blends (with the weight ratio at 90/10, 70/30, 50/50, 30/70 and 10/90) as well as pure PET and PLA are examined. T…
Phase-change materials can be reversibly switched between amorphous and crystalline states and often show strong contrast in the optical and electrical properties of these two phases. They are now in widespread use for optical data storage, and their fast switching and a pronounced change of resistivity upon crystalli…
Conjugated polymers are the primary blocks for organic electronics. Traditionally, conjugated polymers synthesized via Suzuki, Heck, and Stille couplings are catalyzed by soluble homogeneous ligated palladiums, which suffer the contaminations of residual nano-palladium and phosphine impurity resulting from side reacti…
No effective clinical treatment currently exists for traumatic spinal cord injury. Cell replacement therapy holds promise for attaining functional repair. Cells may be delivered directly or near the injury site; however, this strategy requires a delivery vehicle to maintain cell viability. We have identified an inject…
Surface energies have postulated importance to catalysis, crystal growth, sintering, polymorphism, and many other fields. This importance is even more critical when dealing with nanostructured materials, where the surface-to-volume ratio is considerably higher and the surface term accounts for a much larger fraction o…
BACKGROUND: Collagen has proved valuable as biomedical materials for a range of clinical applications, particularly in wound healing. It is normally produced from animal sources, such as from bovines, but concerns have emerged over transmission of diseases. Recombinant collagens would be preferable, but are difficult…
An icosahedral closo-B(12)(2-) scaffold supports 12 copies of Gd(3+)-chelate held in close proximity with each other by suitable linkers which employ azide-alkyne click chemistry. This design is the first member of a new class of polyfunctional MRI contrast agents carrying a high payload of Gd(3+)-chelate in a sterica…
We report on an experimental and simulation campaign aimed at exploring the radiation response of nanoporous Au (np-Au) foams. We find different defect accumulation behavior by varying radiation dose-rate in ion-irradiated np-Au foams. Stacking fault tetrahedra are formed when np-Au foams are irradiated at high dose-r…
Vanadium dioxide (VO2) films with a low semiconductor-to-metal transition temperature of 45 °C were fabricated through direct current magnetron sputtering followed by a post-annealing. Atomic force microscopy measurements show that the VO2 grain size is about one hundred of nanometers. Infrared (IR) characteristic is…
We use the dynamical mean-field theory to study a $p$-$d$ Hubbard Hamiltonian for LaCoO${}_{3}$ derived from ab initio calculations in local density approximation (LDA+DMFT scheme). We address the origin of local moments observed above 100 K and discuss their attribution to a particular atomic multiplet in the presenc…
We report ${}^{75}$As nuclear magnetic resonance studies on an underdoped single-crystal Ba${}_{0.77}$K${}_{0.23}$Fe${}_{2}$As${}_{2}$ with ${T}_{\mathrm{c}}=16.5$ K. Below ${T}_{\mathrm{N}}=46$ K, the NMR peaks for $H\ensuremath{\parallel}c$ split and those for $H\ensuremath{\parallel}a$ shift to higher frequencies,…
We reported the wafer-scale highly-transparent and superhydrophilic sapphires with antireflective subwavelength structures (SWSs) which were fabricated by dry etching using thermally dewetted gold (Au) nanomasks. Their optical transmittance properties were experimentally and theoretically investigated. The density, si…
Chitosan-reinforced starch-based biodegradable composite films were prepared by solution casting. The chitosan content in the films was varied from 20% to 80% (w/w). Tensile strength (TS) and tensile modulus (TM) of the starch-based composites were improved significantly with the addition of chitosan. Water vapor perm…
Supercritical fluids offer fast and facile routes toward well-crystallized tailor-made cerium oxide nanoparticles. However, the use of surfactants to control morphology and surface properties remains essential. Therefore, although water, near-critical (nc) or supercritical (sc), is a solvent of choice, the poor water…
Four lanthanide-based nitronyl nitroxide radical cyclic molecular clusters of formula [Ln(hfac)3(NITPhPO(OEt)2)]2 (Ln(III) = Gd (1), Tb (2A and 2B), and Dy (3) and NITPhPO(OEt)2 = 4'-[2-(1-oxyl-3-4,4,5,5-tetramethylimidazoline)phenyl]diethoxylphosphine oxide) have been synthesized. Their X-ray structures have been sol…
In this study, multifunctional poly(acrylic acid) modified lanthanide-doped GdVO(4) nanocomposites [PAA@GdVO(4): Ln(3+) (Ln = Yb/Er, Yb/Ho, Yb/Tm)] were constructed by filling PAA hydrogel into GdVO(4) hollow spheres via photoinduced polymerization. The up-conversion (UC) emission colors (green, red and blue) can be t…
We have synthesized core/shell/shell (CSS) CdSe/ZnSe/ZnS quantum dots (QDs) and investigated their exciton dynamics using time correlated single photon counting (TCSPC). The unique synthetic method combines hot injection with successive injection of precursors in one pot. Transmission electron microscopy (TEM) shows t…
Semiconductor quantum dots (QDs) are attractive probes for optical sensing and imaging due to their unique photophysical attributes and nanoscale size. In particular, the development of assays and biosensors based on QDs and Förster resonance energy transfer (FRET) continues to be a prominent focus of research. Here,…
The taxonomy of several small-celled, ecologically significant Nitzschia species, which are frequently confused with each other or whose names are misapplied, is clarified. Following an examination of type material and modern samples by light and electron microscopy, it was concluded that N. frustulum (Kützing) Grunow…