Materials Literature
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Knowledge of the carrier type (p- or n-type) and the carrier density of carbon nanotubes is critical in semiconductor applications such as thermoelectric power generation and Peltier cooling. In this paper, an experimental procedure for electrochemically characterizing multiwalled carbon nanotubes (MWCNTs) doped with…
Shape memory alloys (SMA) have been known for over five decades and modeling of their response has attracted much attention over the last two decades. Recent increase in the range of applications of these materials has lead to an increased focus on modeling their thermomechanical response. Various approaches ranging f…
In this article, we present an overview and prospective of inhomogeneous thin deposits of functional materials, which are usually unusable for applications as deposited. We show how common unwanted morphologies, such as crystallites, dewetting and fibrils can be transformed by driving their self- organization with ext…
The conjugation of porphyrins to metal fragments is a strategy for making new compounds that are expected to combine the phototoxicity and the tumour-localization properties of the porphyrin chromophore with the cytotoxicity of the metal fragment for additive antitumour effect. We report here the preparation of new cl…
As part of our interest in chemistry of cationic boron compounds as anion receptors, we have synthesized 2-(4'-dimestylborylphenyl)-N-methyl-pyridinium triflate ([3]OTf) and 2-(5'-dimesitylborylthiophen-2-yl)-N-methyl-pyridinium triflate ([4]OTf) by reaction of the corresponding pyridyl derivatives with MeOTf. Both [3…
Realization of large electro-optic (EO) activity for dipolar organic chromophore-containing materials requires the simultaneous optimization of chromophore first hyperpolarizability (β), acentric order <cos3θ>, and number density (N). As these parameters are inter-related, correlated quantum and statistical mechanical…
Two new polymorphs (C and D) of [t-Fe(abpt)(2)(NCS)(2)] are characterized, a commensurate modulated structure with the c axis tripled in the thermally quenched metastable high spin state at 25 K is found in polymorph C.
Novel group-IV and V nanomaterials are produced by newly set-up low energy ion implantation and electron beam annealing (EBA) systems at GNS Science. This review paper introduces the community to GNS's new nanotechnology systems. Three representative examples on the use of the systems for nanotechnology research and d…
As-synthesized single-walled carbon nanotubes (SWNTs) are mixtures of semiconducting and metallic species and separation of the two is of crucial importance for many applications. In this article, the methods employed for the enrichment of semiconducting and metallic SWNTs are presented, along with possible procedures…
A series of novel linear segmented polyurethanes (PUs) containing a pyridine unit in the main chain have been synthesized by polycondensation reaction of various diisocyanates, 4,4′-diphenyl-methane diisocyanate (MDI), toluene 2,4-diisocyanate (TDI), isophorone diisocyanate (IPDI) and hexamethylene diisocyanate (HDI),…
Melamine-functionalized tri(p-phenyleneethynylene) self-assembles to form opaque and weak gels in aliphatic solvents which turned transparent and stable upon addition of a cyanurate, affording supramolecular nanostructures with distinct physical properties.
and coactivated phosphors exhibit two blue and yellow emission bands under the excitation of UV light. An asymmetric blue emission originates from , whereas the yellow emission originates from . The luminescent mechanism is explained by the resonance-type energy transfer from to , and the energy-transfer efficiency is…
We studied effects of halides on morphology of planar twinned silver nanoparticles and demonstrated application of these effects to precisely tune silver surface plasmon resonance maxima in a broad vis-NIR range using a reliable two-stage modification protocol.
We report on the first general preparation of one dimensional (1D) MTiO3 (M = Ba, Sr, Pb) nanostrips by a surfactant-free approach in nonaqueous molten salt media. The as-synthesized MTiO3 nanostrips were characterized by electron microscopic techniques, X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelec…
Triple-layer (Au@Ag)@polypyrrole core-shell nanoparticles are fabricated by a one-step synthesis involving simultaneous reduction of AgNO3 and polymerization of pyrrole in the presence of Au nanoparticles; the Ag layer in the resulting nanoparticles is etched to give a (Au@H2O)@polypyrrole yolk-shell structure.
Thermoresponsive polyurethane (PU)–silica nanocomposites were synthesized by incorporating silica particles as multifunctional cross-linkers into the PUvia sol–gel reactions. At 2 wt% silica, the composites showed over 99% shape fixity and shape recovery up to the 4th thermomechanical cycle along with outstanding mech…
Two very rapid yttrium initiators for lactide polymerisation are reported; the nuclearity (monomer vs. dimer) of the initiator controls the stereochemistry of the polylactide produced.
The current of uni-axially aligned electrospun ZnO nanofibers is modulated reversibly under UV irradiation, with the sensitivity of the UV nanosensors depending on the surface coating of the nanofibers, due to the effect on the photo-generated current.
A facile biomimetic method is reported for the synthesis of novel BaCO(3) nanofibres with double-stranded and cylindrical helical morphologies via a phosphonated block co-polymer-controlled mineralization process.
Ni-impregnated carbon black (Ni/XC-72R) was tested as a fuel for a hybrid direct carbon fuel cell (HDCFC) with a hybrid electrolyte of yttria-stabilized zirconia and molten carbonate . The open-circuit voltage (OCV) of the HDCFC with Ni/XC-72R was quite high, about 1.5 V at . The maximum power density was improved by…