Materials Literature
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In the present work the rheological characterisation (steady-state and oscillatory data) of a non-chiral low molecular weight liquid-crystalline diol (denoted as HBP 6/6) exhibiting the nematic and smectic phases over a broad temperature range is presented. A non-Newtonian flow behaviour was found. This result, togeth…
We propose a design for a plasmonic copper metamaterial with a negative index of refraction at visible/near-infrared wavelengths. Using numerical simulations, we demonstrate negative refraction by a copper metamaterial prism and perform a parameter extraction technique to verify the sign of the effective, electric per…
Abstract Nanoparticles of lead sulfide, selenide and telluride have been synthesized by the reduction of sulfur, selenium or tellurium powder with sodium borohydride (NaBH 4 ) to produce sulfide, selenide or telluride ions, followed by their reaction with a lead salt. In comparison to the chloride, nitrate or sulfate,…
In this study, mesoporous silica nanofibers were synthesized from tetraethylorthosilicate in a mixture of ethanol, hydrochloric acid, water and polyvinylbutyral PVB as precursor, via a simple sol–gel and electrospinning route. Hexagonal silica nanofibers were obtained by annealing treatment at 850°C for 12 h. The morp…
From the perspective of bond order-length-strength correlation and the local bond averaging approach, we have formulated the number-of-layer resolved Raman shifts of graphene, with quantification of the referential origins from which the Raman shifts proceed and clarification of their origins. It is found that the pri…
A novel strategy is proposed for controllable synthesis of polyaniline nanofibers by introducing high gravity into the interfacial polymerization system. During the polymerization of the aniline monomers, overgrowth and aggregation of the polyaniline nanofibers were effectively suppressed by virtue of high gravity. By…
Abstract The effect of liquid isoprene rubber (LIR) on the dynamic mechanical properties of emulsion‐polymerized styrene/butadiene rubber (ESBR) vulcanizates was investigated by temperature sweep using dynamic mechanical analysis. The introduction of LIR led to ESBR vulcanizates having higher loss factor (tan δ) in th…
We propose a lattice of skewed transmission lines to implement a full effective material tensor. First we show, using transformation electromagnetics, how a skewed lattice will introduce off-diagonal components in the material tensor. We then show how this can be extended to a transmission-line network placed on a ske…
In control: The organization of a thermotropic liquid crystal can be used to control the growth of inorganic nano-objects (like ZnO). When the systems are in their nematic phase state, anisotropic nanoparticles are formed, while in isotropic conditions, isotropic nanoparticles are obtained. Playing with the exact natu…
We report on the growth of single-crystal ZnO nanosheets without stacking faults by Au-seeded pulsed laser deposition in a 0.5 mbar pure oxygen ambient, with their growth direction inclined to the ZnO[0001] crystalline axis. Changing the deposition ambient to 5% oxygen and 95% argon at the same total pressure led to f…
We consider the imbibition of a liquid droplet of finite size on a rough surface and theoretically show that the imbibition dynamics is significantly slower than the familiar Washburn diffusive dynamics, ∼t(0.5). The imbibition does not follow a simple power law. The droplet starts to imbibe with ∼t(0.5) dynamics but…
We recently reported the design and synthesis of a series of conformationally dynamic chromophores that are built on the C(3)-symmetric tris(N-salicylideneaniline) platform. This system utilizes cooperative structural folding-unfolding motions for fluorescence switching, which is driven by the assembly and disassembly…
The authors examines a phenomenological expression for the thermal line edge roughness (LER) power spectrum in a lamellar diblock copolymer (DCP) that includes explicit contributions from interfacial fluctuations and bulk composition fluctuations. The author compares this equation to stochastic simulations of LER in a…
An effective and reusable catalytic system for the oxidation of alcohols was developed based on ▵-Na8HPW9O34. The oxidation was conducted in water using hydrogen peroxide as oxidant. Good yields of ketones were obtained in oxidation of secondary alcohols, and the catalyst was recycled 10 times without obvious loss in…
We study emission of thin film quantum dot solids as a function of intensity of an illuminating laser field when they are deposited on substrates containing gold nanoparticles. Our results show that at a given intensity of this laser the plasmonically enhanced emission of such solids starts to decline abruptly, making…
Partition functions encode all the thermodynamics of a system, but for most systems of practical importance, they cannot be calculated exactly. In this work we present a new hierarchical method for calculating partition functions to arbitrary precision. We discuss the algorithmic details of our implementation, includi…
Synthetic methods yielding highly uniform colloidal semiconductor nanocrystals with controlled shapes and sizes are now available for many materials. These methods have enabled geometrical control of optical properties, which are difficult or impossible to achieve in conventional bulk solids. However, incorporating na…
Abstract Novel polynorbornenes, poly(NBPYTPA), and poly(HNBPYTPA), containing chromophoric and electroactive groups were synthesized by ring‐opening metathesis polymerization using Grubbs' catalysts and followed hydrogenation, respectively. The glass transition temperatures ( T g ) of poly(NBPYTPA) and hydrogenated po…
We have investigated the anisotropy of physical properties (the magnetic susceptibility, the electrical resistivity, the thermoelectric power, the Hall coefficient, and the thermal conductivity) of single-grain icosahedral $i$-Ag${}_{42}$In${}_{42}$Yb${}_{16}$ quasicrystal along the two-, three-, and fivefold symmetry…
A time-dependent phase field model was utilized to investigate the electric field induced tetragonal-to-orthorhombic (T→O) planar phase transformations of perovskite materials, indicated by the simulated semi-discontinuous polarization-electric field hysteresis. Simulations show that transformations are sensitive to t…