Materials Literature
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Abstract Epoxy composites filled with glass fiber and organo‐montmorillonite (OMMT) were prepared by the hand lay‐up method. The flexural properties of the epoxy/glass fiber/OMMT composites were characterized by a three‐point bending test. The flexural modulus and strength of epoxy/glass fiber were increased significa…
Superhydrophobicity and superhydrophilicity of surfaces are key properties for fabrication of self-cleaning surfaces (Lotus effect). It is well known that the mechanism behind this is based on the surface roughness and surface functionalization. To obtain an understanding of the details of the underlying mechanism, a…
Fiber orientation: Polarized IR spectroscopy experiments show that electrospun polyamide fibers are aligned uniaxially (see figure). When the fibers are doped with photochromic molecules, alignment of the dopant is shown to occur during the electrospinning process.
We first synthesized the mesoporous titania, designated KRICT-MT, via replication of the citric acid (CA)-templated mesoporous silica, composed of the silica-nanosphere framework. The KRICT-MT showed the extremely high thermal stability and bimodal mesostructure with the small primary mesopores of 4−5 nm and the large…
Thin films of cadmium sulfide (CdS) were prepared on Au(111) by a new electrochemical co-deposition method. The appropriate electrodeposition potentials based on the underpotential deposition potentials (upd) of Cd and S have been determined by the cyclic voltammetric measurements. The films were grown at room tempera…
The change in magnetic permeability of a material under stress (inverse magnetostriction) offers the potential for a high-performance, low-cost force sensor capable of being used in harsh real-world environments. The existing force sensor technologies are limited in their use in commercial products by either cost issu…
Abstract Multiwalled carbon nanotubes (MWNTs) purified by sulfuric acid and nitric acid were functionalized with polyimide (PI) via an in situ polymerization in N , N ‐diemethyformamide. The transmission electron microscopic and scan electron microscopic images showed that the functionalized MWNTs were wrapped by PI.…
We investigate the temperature ($T$)-dependent low-energy electronic structure of a boron-doped diamond thin film using ultrahigh resolution laser-excited photoemission spectroscopy. We observe a clear shift of the leading edge below $T=11\text{ }\text{ }\mathrm{K}$, indicative of a superconducting gap opening ($\ensu…
Novel materials based on the Ga-Sb-Te system are proposed as a medium for phase-change memory (PCM). Studied compositions were located along the pseudo-binary tie-line GaSb-Sb8Te2, in which the atomic ratio Sb/Te of GaSbTe films is higher by incorporating GaSb into Sb8Te2, indicating a possible higher crystallization…
A cycloreversion (ring-opening) process of one of the photochromic fulgide derivatives, 2-[1-(2,5-dimethyl-3-fulyl)-2-methylpropylidene]-3-isopropylidenesuccinic anhydride, was investigated by means of picosecond and femtosecond laser photolysis methods. The drastic enhancement of the reaction yield was observed by th…
Abstract Supramolecular polymers are assembled from monomeric units held together by reversible non‐covalent interactions. These supramolecular materials display polymeric properties and may soon have important industrial applications. This mini review focuses on the advances in main‐chain supramolecular polymers whos…
While hydrogels exhibit numerous characteristics that make them ideal in biological applications, they are typically limited in overall design flexibility due to the rigid dependence of their physical properties and behavior on the chemistry and cross-linking structure of the gel's network. As the demand for hydrogels…
The use of tetrahydroxy-p-benzoquinone as a slow source of dihydroxymalonato and oxalato ligands led to the isolation under open-air mild reaction conditions of five different compounds, two of them prepared for the first time: [Cu(bpy)(dhmal)]2 (1) and [{SiW12O40}{Cu2(bpy)2(H2O)(ox)}2].16H2O (5) (bpy, 2,2'-bipyridine…
Abstract A newly developed method for the preparation of free base tripyrrin ligands HTrpy by cyanide‐promoted demetalation of nickel chelates TrpyNiNCO was used in order to explore the chemistry of cadmium tripyrrins TrpyCdX with a variety of anionic co‐ligands X. The introduction of the large Cd II ion into the trip…
Four heteronuclear complexes Mn(CuL)2(SCN)2 (1), {[Mn(CuL)2(mu-dca)2].2H2O}n (2), Zn(CuL)2(SCN)2 (3), and [Fe(CuL)(N3)2]2 (4) incorporating macrocyclic oxamide ligands have been synthesized and structurally characterized. L is the dianion of diethyl 5,6,7,8,15,16-hexahydro-6,7-dioxodibenzo[1,4,8,11]-tetraazacyclotetra…
A computational (ZINDO) investigation is employed to estimate the molecular hyperpolarizability (β) of a [(TTF−NH 2 ) 8 ] (TTF = tetrathiafulvalene) octameric stack at various fractional (0 < ρ < 1) oxidation states of TTF ρ + . While the neutral [(TTF−NH 2 ) 8 ] octamer exhibits a modest (7.6 × 10 - 30 cm 5 esu - 1 )…
The interfacial properties of amphiphilic linear diblock copolymers based on poly(ethylene oxide) and poly(epsilon-caprolactone) (PEO-b-PCL) were studied at the air-water (A/W) interface by surface pressure measurements (isotherms and hysteresis experiments). The resulting Langmuir monolayers were transferred onto mic…
Holographic polymer dispersed liquid crystals (HPDLCs) are a polymer/liquid crystal (LC) composite with wavelength selective diffraction that can be switched in microseconds with electric field. As such, HPDLCs are widely applicable in optical and photonic devices. Recently, replacing acrylate polymer with thiol−ene p…
Abstract Novel amphiphilic multi‐arm star‐block copolymers with a hyperbranched core, a hydrophobic inner shell, and a hydrophilic outer shell have been prepared from a commercial hyperbranched polyester macroinitiator by ring‐opening polymerization of ε ‐caprolactone, followed by atom transfer radical polymerization…
Surface attachment of the enzyme horseradish peroxidase (HRP) was studied on untreated and ion beam implanted polystyrene (PS) films. The PS films of 100 nm thickness on a silicon wafer were treated using the plasma immersion ion implantation (PIII) technique, with argon ions of energy 20 keV and fluences of up to 2 x…