Materials Literature
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We report the synthesis, photophysical properties, and morphology of new star-shaped polymers with styrene−fluorene (St-Fl) conjugated moieties. Three polymers with different number of arms (P(St-Fl) n, n = 3, 4, and 8) were obtained by living anionic polymerization, and they exhibited a narrow molecular weight distri…
Chemical enhancement of surface-enhanced Raman spectroscopy was investigated using a gold nanoparticle (AuNP)-coated polymer substrate, and an enormous b 2 -mode signal enhancement arose from the evaporation-induced reorientation of 4-aminobenzenethiol molecules adsorbed onto the AuNP surface. The dynamic analysis of…
Abstract The reaction of tung oil (TO) and 1,1′‐(methylenedi‐4,1‐phenylene)bismaleimide (BMI) in 1,3‐dimethyl‐2‐imidazolidinone (DMI) at 150°C for 4 h and subsequent precipitation gave TO/BMI prepolymer, which was cured at 200°C for 2 h gave crosslinked TO/BMI product with CC ratio from 1/1 to 1/4. The FE‐SEM analysi…
Mimicking the zonal organization of the bone-cartilage interface will aid the production of functional osteochondral grafts for regeneration of skeletal joint defects. This study investigates the potential of the electrospinning technique to build a three-dimensional construct recapitulating the zonal matrix of this i…
Unrestricted density functional theory calculations have been carried out to investigate the reactivity of Th, Th +, and Th 2+ toward the methane dehydrogenation process. A close description of the reaction mechanisms together with the analysis of the electronic factors offer insights into the reactivity of the thoriu…
Fluorescence spectroscopy of single chromophores immobilized on a substrate has provided much fundamental insight, yet the spectral line shapes and dynamics of single chromophores freely diffusing in solution have remained difficult or impossible to measure with conventional linear spectroscopies. Here, we demonstrate…
In an attempt to control the surface dispersion and the mobility of BaO domains on NO x storage materials, TiO 2 /TiO x anchoring sites were introduced on/inside the conventional γ-Al 2 O 3 support matrix. BaO/TiO 2 /Al 2 O 3 ternary oxide materials were synthesized via two different sol−gel preparation techniques, wi…
Incorporation of carbon nanomaterials into industrial and consumer products is increasing, yet their impact on aquatic ecosystems alone and in chemical mixtures is largely unknown. Carbon nanomaterials may be found in the aquatic environment as mixtures with pesticides because of their proposed use in agriculture as s…
With the goal of creating a molecular switch, the hydrogen-bonded diphenylacetylene structure has been modified such that an equilibrium now exists between two intramolecular H-bonded states. Through X-ray crystallography and (1)H NMR analysis it is shown that this equilibrium can be biased in a predictable manner by…
Abstract Poly(vinyl alcohol) (PVA) nanofibers crosslinked with blocked isocyanate prepolymer (BIP) were successfully prepared using the electrospinning process and subsequent thermal treatment. Fourier transform infrared spectroscopy and solid‐state 13 C NMR spectroscopy demonstrated that chemical crosslinks between t…
The reaction of Sn(DPP)(OH) 2 (DPP 2− = 2,3,5,7,8,10,12,13,15,17,18,20-dodecaphenylporphyrin dianion) with H 2 F 16 DPPCOOH (2,3,7,8,12,13,17,18-octakis(3,5-difluorophenyl)-5-(4-carboxyphenyl)-10,15,20-triphenylporphyrin) afforded a porphyrin triad, Sn(DPP)(H 2 F 16 DPPCO O ) 2 ( 1 ), in which the Sn(DPP) unit is link…
Understanding the role of surface chemistry in the stability of nanostructured noble-metal materials is important for many technological applications but experimentally difficult to access and thus little understood. To develop a fundamental understanding of the effect of surface chemistry on both the formation and st…
Light trapping is an important issue for thin film silicon photovoltaic cells due to the limited absorption coefficient for near infrared light. In this letter, we present a photonic structure that combines porous anodic aluminum oxide with a distributed Bragg reflector (DBR) on the backside of Si cells for light trap…
Abstract Changes in supramolecular properties of cellulose I, namely its lateral fibril aggregate dimension (LFAD), in bleached hardwood acid bisulphite pulp during drying was studied using cross-polarization/magic angle spinning carbon-13 nuclear magnetic resonance (CP/MAS 13 C-NMR) in combination with spectral fitti…
Nearly monodisperse BaTiO 3 hollow nanoparticles were prepared through a one-pot template-free route in molten hydrated salt medium. The composition and morphologies of the time-dependent products were investigated in detail, and Ostwald ripening is concluded to be responsible for the hollowing evolvement of the BaTiO…
Abstract Polymer/clay nanocomposites have some unique properties due to combination of flame resistance and improved mechanical and thermal stability properties which are important to enhance the material quality and performance. The objective of this work was to investigate the effect of organically modified montmori…
The direct infusion of macromolecules into defect sites generally does not impart adequate physiological responses. Without the protection of delivery systems, inductive molecules may likely redistribute away from their desired locale and are vulnerable to degradation. In order to achieve efficacy, large doses supplie…
Abstract The analytical potential of attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy has been tested on the following wood-plastic composites (WPCs): high and low density polyethylene (HDPE and LDPE), polypropylene (PP), polystyrene (PS), and a recycled plastic (rHDPE). The data set of A…
Well-designed reactive precursors and templates allow for careful control of solid-state reactions at the nanoscale level, thus enabling the fabrication of materials with specific microstructures and properties. In this study, Fe 2 O 3 @BaTiO 3 core−shell particles have been used as precursors for the in situ fabricat…
A pressure induced semiconductor-semimetal phase transition on tungsten diselenide has been studied using in situ electrical resistivity measurement and first-principles calculation under high pressure. The experimental results indicate that the phase transition takes place at 38.1 GPa. The first-principles calculatio…