Materials Literature
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The structure of a colloidal dispersion consisting of anisometric natural clay particles (beidellite) was followed under shear-flow conditions by small-angle X-ray scattering (SAXS) measurements in a Couette-type cell. It is shown that in this shear-thinning dispersion an orientational order develops with increasing s…
An acid-base switchable dendritic complex was constructed by self-assembly between dibenzo-24-crown-8 terminated T(10)-POSS dendrimer and dibenzylammonium hexafluorophosphate salt based on T(8)-POSS. The formation and its threading-dethreading property were characterized by (1)H NMR and UV-visible absorption spectrosc…
The failure modes common to widely pursued carbon-nanotube-based nano-electromechanical systems are investigated. A fundamental understanding of the underlying mechanisms for failure and their relation to the device design space is developed through complementary in situ electromechanical characterization and dynamic…
Triphilic star-polyphiles are short-chain oligomeric molecules with a radial arrangement of hydrophilic, hydrocarbon and fluorocarbon chains linked to a common centre. They form a number of liquid crystalline structures when mixed with water. In this contribution we focus on a hexagonal liquid crystalline mesophase fo…
Neural scaffolds: A method for fabricating electrospun nanofiber membranes with arrayed microwells and aligned structural cues on their surfaces by using a collector assembled from stainless steel beads is reported. It is demonstrated that formation of cell microarrays and neuronal networks can be achieved using this…
Aligned nanorod inclusions have the potential to significantly improve both the photovoltaic and mechanical properties of polymeric materials. Establishing facile methods for driving or “corralling” the nanorods to self-assemble into such aligned morphologies could facilitate the fabrication of effective, robust devic…
Amphiphilic biodegradable succinylchitosan nanoparticles modified with folic acid are described that act as an emulsifier to form nanoparticles. Their molecular structures and physicochemical as well as self-assembly properties are characterized by means of FT-IR, ¹H NMR, FESEM, DLS, and TEM. The nanoparticles are 60-…
A one-step, large-scale preparation of alkyne-containing hyper-branched polyglycerols (HPG) is reported. The HPGs undergo click reactions to organic azides allowing a range of applications.
In this communication we report the synthesis, structural and preliminary physical characterisation of a new layered oxyselenide Ce(2)O(2)FeSe(2). This material, containing a 1D portion of the structure of the layered FeSe-related superconductors, is a semiconductor with a band gap of around 0.64 eV and orders antifer…
Microwave treatment of CuO nanotip/ZnO nanorod catalyst precursors has been demonstrated to remarkably enhance their activity in methanol reforming reactions. Studies using XRD, Raman, XPS, XAS, and HRTEM analyses conclude that comparative to conventional heating, microwave treatment significantly enhances the activit…
Liquid crystal display (LCD) modes associated with the rotation of the secondary director in nontilted, biaxial smectic phase of an achiral bent-core compound are demonstrated. For LCDs, we find that at least four display modes are possible using SmAPA phase of the studied material, in which the minor directors in adj…
Spin-polarized density functional theory calculations have been performed to investigate the mechanisms for C x H y formation on Fe 3 C(100). It is found that H-assisted CO dissociation (CO + H → CHO; CHO → CH + O) has lower barrier than CO direct dissociation (CO → C + O), but surface C s atom hydrogenation to form s…
One-dimensional (1D) nanostructures of organic functional materials have attracted extensive attention recently due to their promising applications in high-performance optoelectronic devices. The ability to align and pattern 1D nanostructures into highly ordered arrays and complicated architectures is a prerequisite f…
We report the synthesis of luminescent, free standing silicon quantum dots by dry and wet etching of silicon and silicon oxide core/shell nanostructures, which are synthesized by controlled oxidation of mechanically milled silicon. Dry and wet etching performed with CF(4) plasma and aqueous HF, respectively, result in…
The effects of grain size and oxygen vacancies on the dielectric responses of BaTiO3 ceramics were investigated using wideband dielectric spectroscopy. Both dipole and ionic polarizations were enhanced by the reduction in grain size down to 2.5 μm. The annealing in low oxygen partial pressure markedly suppressed the d…
A mathematical model was developed to study the coupled heat and moisture transfer through a fabric system that consists of a single layer of fabric and an air gap. Properties of air and moisture are sensitive to temperature and, hence, were assumed to be functions of local temperature. Therefore, the model is applica…
The motion of a C60 molecule over a graphene sheet at finite temperature is investigated both theoretically and computationally. We show that a graphene sheet generates a van der Waals laterally periodic potential, which directly influences the motion of external objects in its proximity. The translational motion of a…
A series of new near-infrared (NIR) luminescent lanthanide-quinolinate derivatives [Ln(Q-Si)(3)] and xerogels (named as LnQSi-Gel, Ln = Er, Nd, Yb) covalently linked with the Ln(Q-Si)(3) by using the 8-hydroxyquinoline-functionalized alkoxysilane (Q-Si) have been synthesized. The obtained xerogel materials LnQSi-Gel a…
The surface-enhanced Raman scattering enhancement (SERS) of small molecules spatially entrapped near hot spots by using nanofluidic channels with localized surface plasmon resonance is reported. Small molecules are introduced into the interstitial nanogaps between a silver film over nanospheres and polydimethylsiloxan…
Abstract The flammability and synergistic flame‐retardant effects of fumed silica (SiO 2 ) in ethylene vinyl acetate (EVA)/aluminum hydroxide (ATH) blends were studied with limiting oxygen index measurements, UL 94 testing, cone calorimeter testing (CONE), and thermogravimetric analysis (TGA). The results show that th…