Super-hydrophobic tin oxide nanoflowers
Super-hydrophobic 3D SnO(2) flowers with nanoporous petals were produced from the 3D Sn nanoflowers using a controlled shape-preserving thermal oxidation process.
Materials Literature
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Super-hydrophobic and super-wetting surfaces: Analytical potential?
Roughening or texturing surfaces provides super-liquid repellent or film forming properties without alteration of the surface chemistry. These surfaces are easy to produce, can amplify wetting properties and can be either “sticky” or “slippy” to liquids. Their use as water-repellent coatings is established, but their…
The Effect of Rheological Parameters on the Ballistic Properties of Shear Thickening Fluid (STF)-Kevlar Composites
The addition of colloidal shear thickening fluids (STFs) to Kevlar fabrics has been shown to enhance the ballistic penetration resistance of the fabric, under conditions of low velocities and small target sizes. It is believed that this improvement in ballistic properties is related to the resistance of the STF to def…
Use of nondegenerate resonant leaky modes to fashion diverse optical spectra
In this paper, we show that bandstop and bandpass filters with versatile spectral attributes can be implemented with modulated films possessing asymmetric grating profiles. The profile asymmetry breaks the resonant leaky mode degeneracy at normal incidence thereby permitting precise spectral spacing of interacting lea…
Light-induced motions in azobenzene-containing polymers
Abstract The following article is a tribute to the late Almeria Natansohn and is based on a brief summary of her research in azopolymers. She showed that reversible trans–cis–trans photoisomerization of aromatic azo groups covalently bonded within polymers could trigger a variety of motions in the polymer materials at…
Diffusion Studies of Copper on Ruthenium Thin Film
Diffusion studies were carried out on physical vapor deposited Cu/Ru(∼20 nm)/Si samples using secondary ion mass spectroscopy (SIMS) and transmission electron microscopy (TEM). Back side SIMS depth profiling revealed well-defined interfaces and showed that Cu interdiffusion was impeded by Ru thin film up to 450°C vacu…
Plasticizers for Zein: Their Effect on Tensile Properties and Water Absorption of Zein Films
ABSTRACT Cast zein films are brittle at room conditions, so plasticizers are added to make them more flexible. The tensile properties of these films are known to be affected by the relative humidity (RH) of the ambient air. However, little is known about how the plasticizers are affected by RH. Cast zein films were pl…
Sonochemical synthesis of aragonite-type calcium carbonate with different morphologies
Aragonite, a high-pressure polymorph of CaCO3, was synthesized for the first time from simple Ca(HCO3)2 solutions by using high-power ultrasound irradiation. XRD, FT-IR and SEM techniques were used to characterize the phase composition and morphology of the products. The intensity of the ultrasound irradiation was fou…
Differential degradation rates in vivo and in vitro of biocompatible poly(lactic acid) and poly(glycolic acid) homo- and co-polymers for a polymeric drug-delivery microchip
The biocompatibility and biodegradation rate of component materials are critical when designing a drug-delivery device. The degradation products and rate of degradation may play important roles in determining the local cellular response to the implanted material. In this study, we investigated the biocompatibility and…
A template-free aqueous route to ZnO nanorod arrays with high optical property
A mild template-free aqueous route was successfully established to synthesize well-aligned ZnO nanorod arrays, which were proved to exhibit high optical property by PL spectra.
Design of chiral dimesogens containing cholesteryl groups; formation of new molecular organizations and their application to molecular photonics
Photoresponsive liquid crystals and organogels are finding increasing application in information technology and photonics. In this tutorial review, the authors describe how weak intermolecular interactions facilitate molecular organization of cholesterol-containing dimesogens to form such materials. Design considerati…
Surface-enhanced Raman scattering for ultrasensitive chemical analysis of 1 and 2-naphthalenethiols
The results of the search for the optimal experimental conditions for ultrasentitive chemical analysis of 1-naphthalenethiol (1-NAT) and 2-naphthalenethiol (2-NAT) using surface-enhanced Raman scattering (SERS) are discussed. The report begins with a review of the vibrational spectra, including infrared and Raman spec…
Subwavelength photolithography based on surface-plasmon polariton resonance
The use of surface-plasmon polariton (SPP) resonance in the optical near field of a metallic mask to produce fine patterns with a resolution of subwavelength scale is proposed. Preliminary numerical simulations indicate that the critical resolution is mainly determined by the thickness of the metallic mask. The surfac…
Strain-hardening due to Dispersed Cementite for Low Carbon Ultrafine-grained Steels
Strain(work)-hardening in tensile tests was examined for low carbon steels with various ferrite grain sizes ranged from 0.4 to 16 μm. The steels had microstructures composed of ferrite grains and dispersed cementite particles. They were fabricated through warm caliber bar-rollings with an accumulative area reduction o…
Stability of hexagonal solidification patterns
We investigate the dynamics of cellular solidification patterns using three-dimensional phase-field simulations. The cells can organize into stable hexagonal patterns or exhibit unsteady evolutions. We identify the relevant secondary instabilities of regular hexagonal arrays and find that the stability boundaries depe…
A highly efficient oxidation of cyclohexane over Au/ZSM-5 molecular sieve catalyst with oxygen as oxidant
A highly efficient oxidation of cyclohexane to cyclohexanol and cyclohexanone is accomplished over calcined Au/ZSM-5 molecular sieve catalyst with oxygen as oxidant.
Quantum tunneling of the magnetization in the Ising chain compound Ca 3 Co 2 O 6
The magnetic behavior of the Ca3Co2O6 spin chain compound is characterized by a large Ising-like character of its ferromagnetic chains, set on a triangular lattice, that are antiferromagnetically coupled. At low temperature, T < 7 K, the 3D antiferromagnetic state evolves towards a spin frozen state. In this temperatu…
Numerical Solution of Polymer Self-Consistent Field Theory
We propose efficient pseudospectral numerical schemes for solving the self-consistent, mean-field equations for inhomogeneous polymers. In particular, we introduce a robust class of semi-implicit methods that employ asymptotic small scale information about the nonlocal density operators. The relaxation schemes are fur…
Manufacture of elastic biodegradable PLCL scaffolds for mechano-active vascular tissue engineering
A soft and very elastic poly(lactide-co-epsilon-caprolactone) (PLCL)(50:50, Mn 185 x 10(3)) was synthesized. Tubular scaffolds were prepared by an extrusion-particulate leaching method for mechano-active vascular tissue engineering. The copolymer was very flexible but completely rubber-like elastic. Even the high poro…
On the role of interface polymers for the mechanics of natural polymeric composites
Research on the deformation mechanisms of tendons and wood has shown that these tissues deform mostly by shearing of a soft matrix between stiff fibres. For this type of composite to be both strong and tough, tight binding between matrix and fibres is required. Recent results suggest that Nature may have evolved speci…