Materials Literature
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We investigate lamellar microphases in linear gradient copolymer melts by a combination of techniques, including numerical solutions of self-consistent field equations, scaling theory, and analysis of the strong-segregation limit. In particular, we construct a Flory theory to predict the scaling of the equilibrium lam…
We examined thin epitaxial films ${\text{La}}_{5/8\ensuremath{-}y}{\text{Pr}}_{y}{\text{Ca}}_{3/8}{\text{MnO}}_{3}$ $(\text{LPCMO}:y=0.275\ensuremath{-}0.3)$ in situ by Lorentz transmission electron microscopy (TEM) and other microscopy methods. Clear evidence was obtained for the competing two-phase coexistence of an…
Abstract Flame‐retardant biocomposites have attracted much attention in past decades. They can provide many advantages, such as total biodegradability and their abundant renewable sources. In the work reported, biocomposites based on poly( L ‐lactic acid) (PLLA), ramie fabric (FAB) and microencapsulated ammonium polyp…
During the past 60 years, more than 1800 metric tonnes of Pu, and substantial quantities of the “minor” actinides, such as Np, Am and Cm, have been generated in nuclear reactors. Some of these transuranium elements can be a source of energy in fission reactions (e.g., 239 Pu), a source of fissile material for nuclear…
Abstract Low density polyethylene (LDPE)–starch blends were prepared by extrusion. Starch content ranged between 0 and 50% under different conditions of temperature and extrusion speed. Each blend was injected into a commercial mold of a 250 mL cup. Cups were cut into 5 cm × 5 cm coupons. Biodegradability was assessed…
In situ high‐temperature X‐ray diffraction data have been collected for the crystallization of high‐quartz solid solution (hq‐ss) in a Li 2 O–Al 2 O 3 –SiO 2 glass–ceramic. The temporal development of the number density, size, and unit cell parameters of hq‐ss crystals indicated a two‐stage crystallization process. At…
The objective of this work is to prepare microcapsules of polylactide-containing thyme oil by coacervation using a variety of nonionic surfactants with different hydrophilic−lipophilic balance (HLB) values and evaluate the encapsulation efficiency of polar and apolar compounds of oil. Thus, Tween 20, Tween 80, Tergito…
By an oxidative coupling polymerization approach, we have synthesized a novel electroactive polymer with good solubility containing alternating phenyl-capped aniline tetramer in the main chain and azo chromophores in the side chain. Dielectric properties of the as-synthesized polymer were investigated in detail and gr…
A supersaturated NiTi(Al) alloy powder was produced from NiTi and Al powders by solid-state synthesis utilizing high-energy mechanical alloying with times up to 8 h. The microstructure and phase composition of the milling products were evaluated by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysi…
Using the percolation theory, we study the underlying mechanism in the formation of single-walled nanotube bundles with uniform diameter. By applying the cluster repulsion process to stick percolation, we find that the transition becomes explosive. To understand the transition nature, we first investigate the scaling…
An enzyme charge ladder was used to examine the role of electrostatic interactions involved in biocatalysis at the solid-liquid interface. The reactive substrate consisted of an immobilized bovine serum albumin (BSA) multilayer prepared using a layer-by-layer technique. The zeta potential of the BSA substrate and each…
Abstract The crystalline structure and crystallization behavior of PLLA crystals in a 1:1 w/w mixture of low‐MW PLLA with high‐MW PDLA were analyzed using WAXD, DSC, and SAXS. Under cold crystallization, homopolymeric PLLA, appearing as a meta crystal, was discovered in the PDLA/LMW‐PLLA blend. The meta ‐ and α′ cryst…
Supramolecular assembly of functionalized polymers, capable of forming block copolymer-like molecular clusters, has emerged as a promising alternative for creating nanoscopically ordered structures. Here, we demonstrate that nanospheres, which have intriguing internal nanodomains and controllable surface functionality…
An important source of transformer noise is magnetostrictive vibration of the magnetic core. This paper outlines some important effects of mechanical building stress on magnetostriction. Harmonic analysis of magnetostriction is necessary to quantify its influence on acoustic noise but it implied here that the most imp…
Rapid and efficient methods to assess nanoparticle toxicity are desired in current research. Here we showed that Escherichia coli labeled by green fluorescent protein can be a good model bacterium for assessing acute toxicity of TiO(2) (about 50% inhibition ratios after 135 min exposure). Sodium dodecyl sulfate-polyac…
Di-(N-butanoic acid-1,8-naphthalimide)-piperazine dithienylethene was covalently linked to a cysteamine monolayer associated with a Au surface to yield a photoisomerizable monolayer composed of the open or closed dithienylcyclopentene isomers (3a or 3b), respectively. Electrochemical and XPS analyses reveal that the a…
Supramolecular complexes of a poly(tert-butoxystyrene)-block-polystyrene-block-poly(4-vinylpyridine) triblock copolymers and less than stoichiometric amounts of pentadecylphenol (PDP) are shown to self-assemble into a core-shell gyroid morphology with the core channels formed by the hydrogen-bonded P4VP(PDP)complexes.…
The reaction of the chiral macrocyclic compound [Ni( SS -L)](ClO 4 ) 2 with Na 2 [Fe(CN) 5 NO] in acetonitrile/water gave {[Ni( SS -L)][ cis -Fe(CN) 5 NO]} n ( Δ-2 ) and {[Ni( SS -L)][ trans -Fe(CN) 5 NO]} n ( Λ-3 ), and the reaction of chiral [Ni( RR -L)](ClO 4 ) 2 with Na 2 [Fe(CN) 5 NO] gave the corresponding {[Ni(…
The density of vertically aligned carbon nanotube arrays is shown to vary significantly during normal growth by chemical vapor deposition and respond rapidly to changes in feedstock flux. Pulsing the feedstock gas to repeatedly stop and start nanotube growth is shown to induce density variations up to a factor of 1.6…
We performed in situ angle-resolved photoemission spectroscopy measurements on ${\text{La}}_{2/3}{\text{Sr}}_{1/3}{\text{MnO}}_{3}$ thin and ultrathin films deposited onto ${\text{SrTiO}}_{3}$ substrates in order to determine their electronic band structure. We directly identified, in ultrathin films, an enhancement o…