Materials Literature
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A mechanism of persistent luminescence that was proposed in 1996 for has been widely adopted to explain afterglow in many and codoped aluminates and silicates. The mechanism involves the thermally activated release of a hole from in its excited 5d state to the valence band which is subsequently trapped by . In this wo…
Abstract We report calculations of electron inelastic mean free paths (IMFPs) for 50–2000 eV electrons in 14 elemental solids (Li, Be, diamond, graphite, Na, K, Sc, Ge, In, Sn, Cs, Gd, Tb, and Dy) and for one solid (Al) using better optical data than in our previous work. The new IMFPs have also been used to test our…
The synthesis of inorganic materials by biological systems is characterized by processes that occur at close to ambient temperatures, pressures and neutral pH. This is exemplified by biosilicification in marine organisms such as diatoms while laboratory-based synthesis of silica involves extreme temperature and pH con…
The long cherished goal of targeting drugs to specific sites in the body, where the pharmacological action is desired and sparing other tissues has been actively pursued all these years. The concept of magic bullets given by Ehrlich has now seen a metamorphosis to magic wands, in the form of targeted drug delivery sys…
Spin-coating is widely employed for the highly reproducible fabrication of thin film coatings over large areas with high structural uniformity. Research in recent years has extended the scope of spin-coating by chemically engineering the interface of support and solution to obtain specific structural order in the resu…
We study the optical properties of metamaterials made from cut-wire pairs or plate pairs. We obtain a more pronounced optical response for arrays of plate pairs -- a geometry which also eliminates the undesired polarization anisotropy of the cut-wire pairs. The measured optical spectra agree with simulations, revealin…
This review describes the use of macroemulsions as templates for the production of porous materials. We focus on the use of high internal phase emulsions in order to produce interconnected open porous structures. The review encompasses porous hydrophobic polymers, hydrophilic polymers, composites, silica, metal oxides…
Cryoelectron microscopy of biological molecules is among the hottest growth areas in biophysics and structural biology at present, and Frank is arguably the most distinguished practitioner of this art. CryoEM is likely over the next few years to take over much of the structural approaches currently requiring X-ray cry…
The dissolution of high surface area silica with tetralkylammonium hydroxides at concentrations greater than 0.2 M, produces polyanionic cage structures, [R4N+][−OSiO1.5]x or Qx, where x = 6, 8 or 10. The value x depends on the type of alkyl or alkanol group. If R = Me or Me3NCH2CH2OH+ group (choline) x = 8 is favored…
The potentialities offered by EDOT as a building block for the synthesis of functional π-conjugated systems are reviewed. The first part underlines the specific advantages of the EDOT unit for the design of precursors of electrogenerated functional conducting polymers combining high reactivity and low polymerization p…
Unsymmetrical dendrimers, containing both mannose binding units and coumarin fluorescent units, have been prepared using click chemistry and shown to be highly efficient, dual-purpose recognition/detection agents for the inhibition of hemagglutination.
Silver nanoparticles fabricated in Hepes buffer exhibit potent cytoprotective and post-infected anti-HIV-1 activities toward Hut/CCR5 cells.
In this article, imaging applications of luminescent complexes and recent advances in the design and photophysical behaviour of near‐IR responsive complexes are reviewed. Various properties of the luminescent lanthanide complexes are also discussed in detail.
A metamaterial-based electronically controlled transmission-line structure is presented and demonstrated as a novel leaky-wave (LW) antenna with tunable radiation angle and beamwidth functionalities. This structure is, in essence, a composite right/left-handed (CRLH) microstrip structure incorporating varactor diodes…
An increasing number of potential applications for polyoxometalates in human medicine have been reported in the literature. These inorganic complexes are composed of early transition metals (mainly molybdenum, tungsten and vanadium) and oxygen. The present review gives an introduction into the chemistry of these compo…
An actively controlled battery/ultracapacitor hybrid has broad applications in pulse-operated power systems. A converter is used to actively control the power flow from a battery, to couple the battery to an ultracapacitor for power enhancement, and to deliver the power to a load efficiently. The experimental and simu…
Abstract The potential energy surface of curcumin [1,7‐bis(4‐hydroxy‐3‐methoxyphenyl)‐1,6‐heptadiene‐3,5‐dione] was explored with the DFT correlation functional B3LYP method using 6‐311G* basis. The single‐point calculations were performed at levels up to B3LYP/6‐311++G**//B3LYP/6‐311G*. All isomers were located and r…
Abstract Oxides with the nominal chemical formula Li 6 ALa 2 Ta 2 O 12 (A = Sr, Ba) have been prepared via a solid‐state reaction in air using high purity La 2 O 3 , LiOH·H 2 O, Sr(NO 3 ) 2 , Ba(NO 3 ) 2 , and Ta 2 O 5 and are characterized by powder X‐ray diffraction (XRD) in order to identify the phase formation and…
▪ Abstract Development and optimization of multifunctional devices for fluidic manipulation of films, drops, and bubbles require detailed understanding of interfacial phenomena and microhydrodynamic flows. Systems are distinguished by a large surface to volume ratio and flow at small Reynolds, capillary, and Bond numb…
The size and shape dependent electronic and chemical properties of metal nanoparticles has drawn the attention of chemists, physicists, biologists, and engineers who wish to use them for the development of new generation nanodevices. In this article, we report the synthesis of gold nanotriangles using tamarind leaf ex…