Physical Properties of Polymers
DOAJ is a unique and extensive index of diverse open access journals from around the world, driven by a growing community, committed to ensuring quality content is freely available online for everyone.
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
10th International Conference on Magnetic Fluids (ICMF 10)
Rheological Studies of Interferon Creams
The determination of flow curves and the apparent viscosity curves at 28°C of creams containing human leukocyte alpha interferon as active principle is presented in this paper. These creams are used for the treatment of papiloma virus and herpes simplex. It is demonstrated that their behaviour corresponds to a thixotr…
Nanocompósitos de matriz polimérica: estratégias de síntese de materiais híbridos
Associating the well known advantages of hybrid materials to the wide potential of nanomaterials, the new and featuring class of polymer nanocomposites turned into one of the most intensively researched areas. This review highlights recent developments in the field of the synthesis of polymer based nanocomposites. Imp…
Influence of Deposition Temperature on the Structure of Si3N4Thin Film Prepared by MWECR-PECVD
The Si 3 N 4 thin film is prepared by MWECR-PECVD at different deposition temperature and the structure of the Si 3 N 4 thin film is investigated. The results indicate that the structure of the Si 3 N 4 thin film prepared at low deposition temperature is in the amorphous phase. However, when the deposition temperature…
Unprecedented Reversible Migration of Amide to Schiff Base Ligands Attached to Tin: Latent Single-Site Initiators for Lactide Polymerization
In an unprecedented transformation, amide ligands are found to attack the imine carbon centers of tridentate Schiff base ligands attached to tin. The process is reversible, and the resultant (masked) amide species can be exploited as latent single-site initiators for the controlled polymerization of rac-lactide.
Magnetic ordering in La1−xSrxMnO3−x/2 anion-deficient manganites
The structural, magnetic, and electrotransport properties of La 1− x Sr x MnO 3− x /2 (0≤ x ≤0.30) manganites with perovskite structure are investigated experimentally as a function of oxygen deficiency. In the solid solutions La 1− x Sr x MnO 3 , a change in the type of symmetry of the unit cell is observed at x =0.1…
Charge-Transfer Induced Large Nonlinear Optical Properties of Small Al Clusters: Al4M4 (M = Li, Na, and K)
We investigate the linear and nonlinear electric polarizabilities of small Al 4 M 4 (M = Li, Na, and K) clusters. Quantum chemical calculations reveal that these compounds exhibit an exceptionally high magnitude of linear and nonlinear optical (NLO) coefficients which are orders of magnitude higher than the convention…
Effect of Ag‐containing Nano‐composite Active Packaging System on Survival of Alicyclobacillus acidoterrestris
ABSTRACT: The effectiveness of Ag + ‐based antimicrobial film in inhibiting the growth of an Alicyclobacillus acidoterrestris strain was assessed. The proposed active film was obtained by depositing via plasma an Ag‐containing polyethylenoxide‐like coating on a polyethylene layer. Tests were conducted at 44 °C, monito…
Targeting tumor microvessels using doxorubicin encapsulated in a novel thermosensitive liposome
Liposomal drugs accumulate only in perivascular regions in tumors after i.v. injection. Thus, they cannot kill tumor cells in deeper tissue layers. To circumvent this problem, we investigated effects of doxorubicin (DOX) encapsulated in a lysolecithin-containing thermosensitive liposome (LTSL) on tumor microcirculatio…
Biomineralisations in crustaceans: storage strategies
Les crustacés possèdent une remarquable aptitude à élaborer de manière cyclique deux types de calcification : un squelette externe (ou cuticule) inextensible, mais également, chez de nombreuses espèces, en fonction de leur mode de vie, des dépôts transitoires de calcium. Ils sont ainsi sujets à une balance calcique se…
Oxidation and Ammoxidation of Aromatics
Abstract An overview of the state of the art in the direct oxygen or nitrogen insertion to aromatic rings and side‐chains by hydroxylation, acetoxylation, partial oxidation and ammoxidation is presented. The influence of a variety of catalysts and oxidants on the yields of hydroxylated products of aromatic species is…
Dopant Ion Size and Electronic Structure Effects on Transparent Conducting Oxides. Sc-Doped CdO Thin Films Grown by MOCVD
A series of Sc-doped CdO (CSO) thin films have been grown on both amorphous glass and single-crystal MgO(100) substrates at 400 degrees C by MOCVD. Both the experimental data and theoretical calculations indicate that Sc3+ doping shrinks the CdO lattice parameters due to its relatively small six-coordinate ionic radiu…
Spin transition in LaCoO 3 investigated by resonant soft X-ray emission spectroscopy
The spin transition in LaCoO 3 is investigated by temperature-dependent resonant soft X-ray emission spectroscopy near the Co 2 p absorption edges. This element-specific technique is more bulk sensitive with respect to the temperature-induced spin state of the Co 3+ ions in LaCoO 3 than other high-energy spectroscopic…
A systematic investigation on the influence of the chemical treatment of natural fibers on the properties of their polymer matrix composites
Abstract This paper reports a systematic study of the effects on composite properties of different chemical treatments on natural fibers. Both short flax fibers and flax cellulose pulp in a polypropylene matrix have been investigated. The influence of treatments on fiber properties was investigated by means of spectro…
The role of polyhydroxyalkanoate biosynthesis by Pseudomonas aeruginosa in rhamnolipid and alginate production as well as stress tolerance and biofilm formation
Pseudomonas aeruginosa is capable of synthesizing polyhydroxyalkanoic acids (PHAs) and rhamnolipids, both of which are composed of 3-hydroxydecanoic acids connected by ester bonds, as well as synthesizing the biofilm matrix polymer alginate. In order to study the influence of PHA biosynthesis on rhamnolipid and algina…
Magnetoelectric coupling in ferroelectromagnetPb(Fe1∕2Nb1∕2)O3single crystals
The magnetic and dielectric properties of ferroelectromagnet (FEM) ${\mathrm{Pb}(\mathrm{Fe}}_{1∕2}{\mathrm{Nb}}_{1∕2}{)\mathrm{O}}_{3}$ (PFN) single crystals have been investigated. Anomalies in the dielectric constant as a function of temperature have been observed near its N\'eel temperature of $\ensuremath{\sim}14…
Air-Filled Porosity and Permeability Relationships during Solid-State Fermentation
An experimental apparatus was constructed to measure the structural parameters of organic porous media, i.,e. mechanical strength, air-filled porosity, air permeability, and the Ergun particle size. These parameters are critical to the engineering of aerobic bioconversion systems and were measured for a straw--manure…
Influence of Trapping on the Exciton Dynamics of Al_xGa_1-xAs Films
We present a systematic study on the exciton relaxation in high purity AlGaAs epilayers. The time for the excitonic photoluminescence to reach its maximum intensity (t_max) shows a non-monotonic dependence on excitation density which is attributed to a competition between exciton localization and carrier-carrier scatt…
Yarn Pull-Out as a Mechanism for Dissipating Ballistic Impact Energy in Kevlar® KM-2 Fabric
Yarn pull-out can be an important energy absorption mechanism during the ballistic impact of woven Kevlar® fabric. This study reports the effects of fabric length, number of yarns pulled, arrangement of yarns, and transverse tension on the force-displacement curves for yam pull-out tests on Kevlar® KM-2 fabric under l…