Materials Literature
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Estudos sobre cinética de liberação de K e Mg permitem uma melhor compreensão da dinâmica desses nutrientes no solo e podem fornecer subsídios para adequação das recomendações de adubação e aumentar a produção das plantas. A seleção do local de amostragem foi definida com base nas diferenças entre os materiais de orig…
Abstract Fluorinated cyclotriphosphazene is selected as a novel flame-retarding additive in the electrolyte for lithium-ion batteries. The effect of the phosphazenes on the thermal stability of LiCoO2 cathode has been investigated by the thermal analyses on charged LiCoO2 electrodes in the presence of the electrolyte…
Abstract Prior work has shown that oat ( Avena sativa ) seeds are a rich source of peroxygenase, an enzyme that promotes the oxidation of carbon‐carbon double bonds to form epoxides. Ground and defatted oat seeds were used as a low‐cost source of peroxygenase. A systematic study of the epoxidation of i ‐butyl amides f…
Ceramics of (1 − x)BaTiO3−xLa(Mg1/2Ti1/2)O3 series (x = 0, 0.025, 0.05, 0.075 and 0.1) were dielectrically investigated. Based on the dielectric and X-ray diffraction data, phase diagram of the system for the studied composition range has been determined. Apparent relaxor behavior was revealed to set in when the BaTiO…
Large Third-Order Optical Nonlinearities of a Croconium Dye in Tetrahydrofuran Solution and in Poly(methyl methacrylate) Coating Films Measured Using Resonant Femtosecond Degenerate Four-Wave Mixing Technique, Li, Zhongyu, Jin, Zhao-hui, Kasatani, Kazuo, Okamoto, Hiroaki, Takenaka, Shunsuke
The crystallization behavior of poly(trimethylene terephthalate (PTT) in compatibilized and uncompatibilized PTT/polycarbonate (PC) blends are investigated in the research reported in this paper. The differential scanning calorimetry (DSC) results showed that the crystallization behaviors of PTT/PC blends were very se…
The present work investigates the structure of large polystyrene (PS) chains in solutions of small poly(ethyl methacrylate) (PEMA) microgel particles in toluene. Toluene is a good solvent for the PS chains. The PEMA colloids have an outer radius of R=11 nm which is much smaller in size than the radius of gyration Rg=5…
We describe time-of-flight secondary ion mass spectrometry (SIMS), depth profiling, and atomic force microscopy studies of nanoporous silica (NPS) ultralow-k (ULK) dielectric films after C4F8∕90% Ar plasma etching. The goal of this work was to establish the role of materials chemistry and porosity on determining the c…
Spectral selectivity based on tuning the surface plasmon resonance in metallic nanoshells by variation of the relative shell thickness is shown to be limited by the interplay between scattering and absorption. To achieve resonance energies in the near infrared and infrared, relatively large cores are needed, which lea…
This paper reports the thermoelectric properties of intrinsic N-type bismuth telluride (Bi<sub>2</sub>Te<sub>3</sub>) thin films (2.5-10 μm thickness). These films were deposited using radio frequency (R.F.) magnetron sputtering. These properties include; Seebeck coefficient and electrical resistivity at differen…
Polarized infrared (IR) spectroscopy has been used to determine the crystalline and amorphous orientation of polyamide fibers. The transition moment angle of the band at 936 cm-1 of PA66 was determined to be 48 degrees using IR spectroscopy and birefringence measurement. The crystalline orientation of PA66 fibers was…
Ideally ordered DNA nanopatterns have been formed by selectively opening holes in a barrier layer covering gold-filled anodic porous alumina, and then adsorbing thiolated DNA onto the exposed gold nanodisks. Fluorescence microscopy of fluorescent-dye-labeled thiolated DNA fixed on the gold-disk array confirms the sele…
The synthesis and physico-chemical characterisation of a biodegradable multiblock polymer drug carrier based on poly(ethylene glycol) (PEG) is described. The blocks of PEG ( M w 2,000) are connected by an enzymatically degradable tripeptide derivative consisting of one lysine and two glutamic acid residues. Doxorubici…
Epitaxial Pt films with (111) and (100) orientations were grown on Y 2 O 3 -stabilized ZrO 2 (YSZ)-covered (100)Si substrates by RF sputtering. (111)Pt films were epitaxially grown on (100)YSZ∥(100)Si substrates at 580 and 680°C, but competitive crystal orientations of (111) and (100) at 780°C. In contrast, a (100)-or…
The structure of the complex between the minor groove binder netropsin and d(GGCCAATTGG) was determined via single-crystal X-ray techniques. The structure was refined to completion using refmac5.1.24, resulting in a residual R-factor of 20.0% (including 68 water molecules). Using crystal engineering and cryocooling te…
Four polyethylene glycol (PEG)/2,4-toluene diisocyante (TDI)/ perfluorinated aliphatic alcohols mixture (F6) adducts were prepared by reacting equimolar ratios of PEG (300, 600, 1000, or 2000), TDI, and F6 at 90°C for 90 min. All adducts, except that based on PEG 300 were water dispersible. These dispersions were used…
We have investigated the dynamics of phenylene rings in glassy bisphenol-A (BPA) polycarbonate (PC) by means of quasielastic neutron scattering. Taking advantage of selective deuteration of the samples, we have studied the incoherent scattering of hydrogens in phenylene rings on the one hand, and on the other hand the…
In this study, the effect of processing parameters on the cellular morphologies and mechanical properties of PMMA microcellular foams is investigated. Microcellular closed cell Poly(methyl-methacrylate) (PMMA) foams were prepared using a two stage batch process method. The foam structure was controlled by altering the…
Abstract Polymeric scaffolds are three‐dimensional, porous structures that may be used as a vehicle to deliver cells or therapeutic factors to repair tissue defects. Both biodegradable and non‐biodegradable polymers have been developed for this purpose. In this review, we survey the polymers that have been investigate…
A series of glycidylazide–poly(ethylene glycol) (GAP-PEG) copolymers were synthesized by cationic ring-opening polymerization of epichlorohydrin (ECH) in the presence of poly(ethylene glycol) (PEG) using borontrifluoride etherate (BF3-etherate) as catalyst, followed by the conversion of the CH2Cl groups of poly(epichl…