Materials Literature
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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…
Boron-nitride nanotubes (BNNTs) are being increasingly used due to their superior biocompatibility. We develop sensor equations for using the BNNTs as possible mass sensors for nanoscale biological objects. Two approaches based on static and dynamic deflection shapes have been investigated. Two types of sensor configu…
Abstract Homogenous dispersion and strong interfacial bonding are prerequisites for taking full advantage of the mechanical properties of nanotubes in a composite. In order to simultaneously achieve both conditions, a highly efficient and mechanically non‐destructive functionalization of nanotubes is developed. With f…
Hybrid nanofibers with different concentrations of functionalized carbon nanotubes (CNTs) in polyacrylonitrile (PAN) were fabricated using the electrospinning technique and subsequently carbonized. Acrylonitrile-modified CNTs were dispersed in the PAN before electrospinning. The surface morphologies and structures of…
Over the past decade, transport measurements on individual single-wall nanotubes have played a prominent role in developing our understanding of this novel carbon conductor. These measurements have identified both metallic and semiconducting nanotubes, determined their dominant electronic scattering mechanisms, and el…
Two novel copper(II) complexes with tert-butyl 2-pyridyl nitroxide (2pyNO(*)), [Cu(2+)(2pyNO(-))(2pyNO(*))](2)(BF(4)(-))(2) (1 x BF(4)) and [Cu(2+)(2pyNO(-))(2pyNO(*))](2)(ClO(4)(-))(2) (1 x ClO(4)), were prepared and structurally characterized. They contained mixed-valent ligands from 2pyNO, whose oxygen atoms were l…
Twist and sort out! Chiral separation of PdII, NiII, and PtII complexes of [28]hexaphyrin(1.1.1.1.1.1) was achieved by HPLC on a chiral stationary phase (see inset for CD trace). The absolute configuration for the PdII complex was determined by X-ray crystallography. Asymmetric metalation of hexaphyrin, achieved with…
A centrifugal method has been modified and applied to the assessment of water retention value (WRV) in cellulosic materials. Microcrystalline cellulose (MCC), small particles/fibrils isolated from MCC using high-pressure homogenizer, and pulp fibers saturated in water were centrifuged at different speeds and times wit…
Abstract The formation of Fe3O4 nanoparticles by hydrothermal process has been studied. X‐ray Diffraction measurements were carried out to distinguish between the phases formed during the synthesis. Using the synthesized Fe3O4 nanoparticles, poly(vinyledene fluoride)‐Fe3O4 composite films were prepared by spin coating…