Materials Literature
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A chemical liquid-phase deposition method is used to synthesize perpendicularly branched nanotripods on substrates through continuous replenishment of nutrients into solution. A good control in crystal growth from oriented tripods to faceted crystals has been achieved, and more complex nanostructures are expected to b…
The wetting behavior of thin films of $4\mathrm{\text{\ensuremath{-}}}n\mathrm{\text{-octyl-}}{4}^{\ensuremath{'}}\mathrm{\text{-cyanobiphenyl}}$ (8CB) on Si is investigated via optical and x-ray reflectivity measurement. An experimental phase diagram is obtained showing a broad thick-thin coexistence region spanning…
The effect of Mn doping on the cubic to hexagonal phase transition temperature in BaTiO 3 has been determined by quenching samples with different Mn contents from a range of temperatures. Under conditions of equilibrating samples in air over the range 1000°–1400°C, cubic solid solutions BaTi 1− x Mn x O 3−δ form over…
High Resolution Image Download MS PowerPoint Slide Visible craze initiation stress has been measured for a wide range of linear and branched monodisperse polystyrenes (PS) soaked in diethylene glycol. Results show that, for a given time under stress, craze initiation in linear PS is disentanglement-dominated below a c…
The behavior of bubbles confined in tubes and channels is important in medical and industrial applications. In these small spaces, traditional means of experimentally observing bubble dynamics are often impossible or significantly perturb the system. A laser Doppler vibrometer (LDV) requires a narrow (<1 mm diameter)…
Abstract A series of imidazolium‐based ionic liquid monomers bearing a terminal pyrrole moiety were synthesized and electrochemically polymerized. It is found that the polymerizability of the synthesized ionic liquids is strongly dependent on the type of the counteranions. Although bromide monomer is not polymerizable…
Abstract In this paper we report the results obtained for inter‐matrix synthesis (IMS) and characterization of monometallic and bimetallic polymer‐stabilized metal nanoparticles (PSMNPs). The IMS procedure is based on the use of appropriately functionalized polymeric membranes as nanoreactors, which allows both synthe…
Abstract Copolymerization of ornithine‐ and lysine‐derived N ‐propargylamides, N ‐α‐ tert ‐butoxycarbonyl‐ N ‐δ‐fluorenylmethoxycarbonyl‐ L ‐ornithine N ′‐propargylamide ( 1 ), N ‐α‐ tert ‐butoxycarbonyl‐ N ‐ε‐fluorenylmethoxycarbonyl‐ L ‐lysine N ′‐propargylamide ( 2 ), N ‐α‐fluorenylmethoxycarbonyl‐ N ‐δ‐ tert ‐buto…
RGD (arginine-glycine-aspartic acid) is a known peptide sequence that binds platelet integrin GPIIbIIIa and disrupts platelet-fibrinogen binding and platelet cross-linking during thrombosis. RGD peptides are unsuitable for clinical applications due to their high 50% inhibitory concentration (IC50) and low in vivo resi…
We use multispeckle dynamic light scattering to study the dynamics of physical gelation of methylcellulose in water. Following a temperature ramp to above 55 °C, a polymer network is formed which can be destroyed upon cooling the gel. We monitor this process by detecting the total scattered light intensity which shows…
Lead‐free (K 0.44 Na 0.52 Li 0.04 )(Nb 0.80− x Ta 0.20 Sb x )O 3 piezoelectric ceramics were prepared by the ordinary sintering method. The much higher Pauling electronegativity of Sb compared with Nb makes the ceramics more covalent. By increasing x from 0.00 to 0.06, the phase structure of the ceramics changed from…
The dyad RuLRe contains (Re(bpy)(CO)3Cl) and (Ru(bpy)(bpyam)2)2+ termini (bpy = 2,2'-bipyridine; bpyam = 4,4'-diethylamido-2,2'-bipyridine) separated by a flexible ethylene spacer. Luminescence studies reveal the expected Re --> Ru photoinduced energy transfer, with partial quenching of Re(I)-based triplet metal-to-li…
We have examined bulk structure models for icosahedral AlPdMn in terms of the densities, compositions, and interplanar spacings for the fivefold planes that might represent physical surface terminations. We focus on four models that contain no partial or mixed occupancies, but some comparison is made to a fifth model…
TFTs based on solution-processed CdSe films as the semiconductor and a solution-processed nanoscopic self-assembled gate dielectric are fabricated. The devices exhibit high electron mobilities at low operating voltages.
Singlet-singlet, singlet-triplet, and triplet-triplet energy transfer takes place within single crystals and amorphous solid-state solutions of a molecular dyad comprising boron dipyrromethene and oligo-thiophene subunits. The crystal and sublimed thin-films are strongly fluorescent.
The main goal of this contribution is to show that periodic arrangements of chiral scatterers can be the basis for the development of three dimensional and isotropic negative refractive index artificial media. Three dimensionality and isotropy are key issues in this context since only three dimensional structures can…
Organic–inorganic hybrid films prepared from copper(II)-containing Schiff base complexes bearing long alkoxy chains grown under microgravity conditions show enhanced third-order NLO susceptibilities relative to films grown at 1 g.
Nonradiative energy transfer from a GaAs quantum well to a thin overlayer of an infrared organic semiconductor dye is unambiguously demonstrated. The dynamics of exciton transfer are studied in the time domain by using pump-probe spectroscopy at the donor site and fluorescence spectroscopy at the acceptor site. The ef…
Gas bubbles in water act as oscillators with a natural frequency inversely proportional to their radius and a quality factor determined by thermal, radiation, and viscous losses. The linear dynamics of spherical bubbles are well understood, but the excitation mechanism leading to sound production at the moment of bubb…
Tumour is a morbid state, characterized by spontaneous outgrowth of an abnormal mass of cells. The evolution of tumours is random, disorganized, a condition of numerous mutations. The properties are biased and incompletely comprehended. It is a malignant or benign condition that encompasses its own rules of morphogene…