Materials Literature
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In this critical review, we discuss the history and development of polymer devices wherein manipulation of the electronic conductivity by electrochemical redox processes in a conjugated polymer is used to form new functions. The devices employed are an electrochemical transistor, an electrolyte-gated field-effect tran…
Hexagonal mesocrystals formed by tungsten oxide nanowires have been synthesized using a solvothermal method without any template. The selected area electron diffraction (SAED) analysis of the regular hexagonal mesocrystal demonstrates that the nanowires are highly ordered. Electrochemical behaviour of the mesocrystals…
Slope-tunable Si nanorod arrays (NRAs) were fabricated with colloidal lithography and reactive ion etching (RIE). Sharpened NRAs fabricated by increasing the SF6/O2 flow ratio during RIE exhibit enhanced antireflection (AR) and hydrophobic properties, which are attributed to the smooth gradient in the effective refrac…
Two-photon luminescence (TPL) from gold nanorods shows considerable potential in biological imaging. We study the imaging of gold nanorods in Madin-Darby canine kidney (MDCK) cells using fluorescence lifetime imaging microscopy (FLIM). FLIM provides images with better contrast and sensitivity than intensity imaging. T…
Continuous SiC fiber-reinforced SiC matrix composites (SiCf/SiC) have been considered to be a key material as structural components for aerospace and energy fields. This paper reviews novel fabrication process of continuous SiCf/SiC composites with high performance based on interfacial and microstructure control and o…
The β-phase of Zn4Sb3 was rediscovered as a very promising thermoelectric material in the mid-nineties. The material seemed to have it all: a very high thermoelectric figure of merit in the technologically important mid-temperature region (200–400 °C), potential for further optimization through doping and best of all…
The positively charged layered gadolinium hydroxide nanosheets were produced by exfoliation in formamide and was applied to fabricate highly transparent and highly luminescent Gd(2)O(3) : Eu layers on quartz glass by simple evaporation and subsequent annealing.
Vertically aligned and site controllable ZnO nanowire arrays have been synthesized and replicated via hydrothermal method on general flexible substrates. The replication was demonstrated for three generations. The morphology and density of the nanowire arrays could be optimized in the original generation by adjusting…
Nanoassemblies are formed via self-assembly of ZnS capped CdSe quantum dots (QD) and perylene bisimide dyes (PBI). Upon assembly formation with functionalized dye molecules the QD photoluminescence (PL) is quenched. Quenching has been assigned partly to FRET (fluorescence resonance energy transfer) and NON-FRET proces…
The Journal of Aerospace Technology and Management is a techno-scientific publication serialized, edited, and published by the Institute of Aeronautics and Space (Instituto de Aeronáutica e Espaço-IAE).
Since their initial description in 1857, gold nanoparticles have been used extensively in the fields of diagnostics and therapeutics. Now, gold nanoparticles are engineered to target the delivery of potent anti-cancer therapeutics to solid tumors to improve either their safety or efficacy or both. Described in this ch…
We report on the design, investigation and comparison of the adhesive properties of poly-(N-isopropylacrylamide) and biocompatible polyethylene glycol-based thermoresponsive brushes. Specifically, a poly-(N-isopropylacrylamide), PNIPAM, poly-(oligo(ethylene glycol) methyl ether methacrylate-co-2-(2-methoxyethoxy)ethyl…
The degradation of cathode performances by chromium poisoning was studied at two cathodes [ (LSM) and ] on the electrolyte. Cathodic currents were decreased by the supply of Cr vapors under a constant overvoltage (−0.3 V vs reference electrode) at 1073 K up to 300 h. The polarization resistances increased with time to…
A series of polyimides were synthesized <italic>via</italic> a polycondensation of 2′,7′-bis(4-aminophenoxy)-spiro(fluorene-9,9′-xanthene) with aromatic tetracarboxylic dianhydrides. They exhibited a low dielectric constant, low moisture absorption, excellent solubility, high glass transition temperatures and high opt…
We report the ultrafast charge carrier relaxation dynamics of mercaptopropionic acid capped CdTe quantum dot (QD) using femtosecond transient absorption spectroscopy by exciting the particles with 400 nm laser light and monitoring the transients in the visible to near IR region. Cooling dynamics and population dynamic…
The preparation of supramolecular nanowires capable of conducting electricity can be achieved via the gel state. These wires, which range in width from a few to several tens of nanometres, are connected in a network—characteristic of organogels—which can provide bulk conducting materials thanks to close contacts betwe…
This paper reports static and dynamic control of the phase separation structures of polymer blended nanoparticles. The phase separated nanoparticles were prepared from various combinations of polymers by evaporating good solvents from the polymer blended solutions after adding poor solvents into the solutions. Transmi…
A variety of perylenetetracarboxy-3,4:9,10-diimide derivatives have been synthesized. Particular attention was paid to substituents in positions 1, 6, 7 or 12. The energy differences between the frontier orbitals have been determined using optical spectroscopy (UV and fluorescence). The energy of the lowest unoccupied…
Bismuth ferrite BiFeO3 has attracted a great deal of interest because of its multiferroic properties. However, BiFeO3 synthesized by conventional methods in the forms of single crystals, ceramics or thin films only exhibit ferroelectricity and antiferromagnetic order at room temperature, with weak ferromagnetism appea…
Hollow spherical nanoparticles with ordered mesoporous silica shells were fabricated by evaporation-induced self-assembly using (NH(4))(2)SO(4) and cetyltrimethyl ammonium bromide (CTAB) as templates. The model drug, L-methionine, was encapsulated within the spherical void at high loadings by repeated crystallization.