Materials Literature
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The structure of ZnO quantum dots prepared via the wet chemical method was studied. By introducing an annealing treatment (150 °C–500 °C), we also investigated the effect of the change in the structure of the dots on their luminescence properties. Our studies revealed that the surface of the as-prepared dots is passiv…
*Reprinted from Functional Monomers and Polymers, 2nd ed.; Takemoto, K., Ottenbrite, R.M., Kamachi, M., Eds.; Marcel Dekker, Inc.: New York; 1997, 149–171.
Al–Cu–Fe alloys were prepared from elemental powders in a high-energy planetary ball mill. A sequence of solid state reactions resulting in quasicrystal (QC) phase formation takes place during heating of the as-milled powder. These reactions were studied by both differential scanning calorimetry and x-ray diffraction…
The preparation of colloidal gold is a subject of practical interest in many technological fields. It is generally accomplished by reduction of HAuCl4 solution with sodium citrate which is known to be influenced by several factors such as temperature and reactants concentration. In the course of the present investigat…
Patterned films of a low-polydispersity polymer densely end-grafted on a silicon substrate were fabricated for the first time by the combined use of the Langmuir−Blodgett (LB) and the surface-initiated atom transfer radical polymerization (ATRP) techniques: a blend monolayer of 2-(4-chlorosulfonylphenyl)ethyltrimethox…
The thermal behavior of a low-defect kaolinite fully expanded with hydrazine-hydrate has been investigated in a nitrogen atmosphere at a constant, preset decomposition rate of 0.15 mg/min. Under controlled-rate thermal analysis (CRTA) conditions, it was possible to distinguish between loosely bonded (adsorbed) and str…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTAlan J. Heeger, Alan G. MacDiarmid, and Hideki ShirakawaCite this: Macromolecules 2002, 35, 4, 1137–1139Publication Date (Web):January 12, 2002Publication History Published online12 January 2002Published inissue 1 February 2002https://doi.org/10.1021/ma0118973Copyright © 2002 Am…
In situ small-angle X-ray scattering (SAXS) studies have been conducted to monitor the structural changes of sepiolite clay upon heating. The samples were heated first under nitrogen to establish the temperature at which pure sepiolite folds. Then, propylene was incorporated into the sepiolite channels and carbonized…
Thin films of alternating DNA and poly- l -lysine (PLL) layers were fabricated onto various planar surfaces by the layer-by-layer (LbL) self-assembly technique. For both the polydeoxynucleotide (PDN, polyguanylic acid or poly[G]) and the oligodeoxynucleotide (ODN, a 30-mer) investigated, UV−visible spectrometry and co…
Engineering models are presented in this paper to predict the penetration and perforation of a range of targets struck normally by projectiles with different nose shapes over a wide range of impact velocities. The projectiles are either rigid or eroding and the targets are made of metallic materials as well as other m…
Polyaryl ethers are a well known class of engineering thermoplastics. The aromatic portion of the poly(arylene ether) is believed to contribute to thermal stability and good mechanical properties o...
Polymer simulations can be performed at many different length scales by using techniques ranging from quantum chemistry to finite element via a hierarchy of coarser and coarser particle or field-based methods. Recent years have seen many efforts to connect simulations at different levels to 1) indirectly predict large…
Molecular dynamics (MD) simulations of bulk atactic polystyrene have been performed for chains up to 320 monomer units in a temperature range from 100 to 600 K and in a broad pressure range from 0.1 to 1000 MPa. The MD-determined specific volume vs temperature curves are in a good agreement with experimental PVT data…
We present a promising coarse-graining strategy for linking micro- and mesoscales of soft matter systems. The approach is based on effective pairwise interaction potentials obtained from detailed atomistic molecular dynamics (MD) simulations, which are then used in coarse-grained dissipative particle dynamics (DPD) si…
Ferrocene has been encapsulated within a symmetric ether-amide dendritic shell and its redox potential monitored in a variety of solvents. The dendritic effect generated by the branched shell is different in different solvents. In less polar, non hydrogen bond donor solvents, attachment of the branched shell to ferroc…
The dipole moments of four photochromic derivatives of indolinospirobenzopyran have been studied in their spiro and their open merocyanine form, in dioxane. Determinations have been done by electrooptical absorption measurements (EOAM). To prepare either a pure spiropyran or a pure merocyanine form solution, the exper…
The esterification kinetics of lactic acid with methanol without addition of catalyst and catalyzed by ion-exchange resins are presented in this work. The effect of catalyst type, stirrer speed, catalyst size, catalyst loading, initial reactant ratio, and temperature on reaction kinetics was evaluated. Experimental re…
Metallic nickel was electrodeposited from aqueous nickel(II) acetate dissolved in the lyotropic liquid crystalline phases of Brij 56 and Brij 78 surfactant templates to form metal films with hexagonal arrays of nanometer-sized channels. The applicability of these materials as inexpensive, large area and low-resistance…
Oxidized single-walled carbon nanotubes (SWNTs) have been reacted with cadmium selenide (CdSe) nanocrystals, capped with mercaptothiol derivatives, as well as with titanium dioxide (TiO 2 ) nanocrystals, functionalized with 11-aminoundecanoic acid to form nanoscale heterostructures, characterized by transmission elect…
Low-molecular-weight poly(ethylene terephthalate) (PET) (viscosity-average molecular weight was subjected to solid-state polymerization (SSP) in the temperature range between 230 and 250°C for up to 20 hr under high vacuum The procedure of SSP allowed us to obtain a number of PETs ranging in M η from 43 to 300 kg/mol.…