Materials Literature
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Nowadays, synthetic biodegradable polymers, such as aliphatic polyesters, are largely used in tissue engineering. They provide several advantages compared to natural materials which use is limited by immunocompatibility, graft availability, etc. In this work, poly(L-lactic) acid (PLLA), poly(DL-lactic) acid (PDLA), po…
Abstract magnified image A series of π‐aryl/heteroaryl conjugated coumarin‐thiazole systems 8a‐f has been synthesized by using Hantzsch thiazole protocol and Wittig olefination as the keys. In the UV‐Visible spectra of 8a‐f , a main absorption band associated with a dominant π‐π* transition is observed in the region o…
X-ray diffraction patterns showed that crystallinity of the annealed ZnO films was improved by thermal annealing. Transmission electron microscopy images showed that columnar structures were preferentially formed in ZnO thin films due to thermal annealing, and electron energy loss spectroscopy images showed that annea…
The growth temperature dependence of the interface perfection of full Heusler alloy Co2FeSi∕GaAs(001) hybrid structures have been examined using transmission electron microscopy (TEM) and high-resolution x-ray diffraction (HRXRD). The film grown at 100°C shows an atomically abrupt interface without interfacial reactio…
Catalyst-assisted growth of boron nanowires and novel tube–catalytic particle–wire hybrid boron nanostructures were achieved by pyrolysis of diborane at 820–890°C and ~ 200 mTorr in a quartz tube furnace. Electron microscopy imaging and diffraction analysis reveal that most of the nano-structures are amorphous. Elemen…
Abstract Bacterial influenced corrosion of AISI 316 stainless steels (SS) and ASTM A36 carbon steel by two strains of sulfate reducing bacteria (SRB) were analyzed. Thermophilic and mesophilic bacteria were isolated from the condensate fluid of “Los Azufres”, a geothermal electric field located in the State of Michoac…
Toluene oxidation with molecular oxygen as the sole oxidant, and μ-oxo-bis[tetraphenylporphinatoiron(III)] as the catalyst, are reported. Under the reaction conditions of 438 K and 0.8 MPa, the molar total yields for the products benzaldehyde and benzyl alcohol and the turnover number of the catalyst are 4.35% and 21,…
Selective excitation of a variety of anthracene derivatives in the presence of anthracene led to the formation of only the cross-cyclomer products, while irradiating these mixtures at wavelengths where anthracene also absorbs led to both dianthracene and the mixed cyclomers being formed. This method was shown to be ge…
Abstract An electrochemically integrated multi‐electrode array namely the wire beam electrode (WBE) and noise signatures analysis have been applied in novel combinations to study crevice corrosion behaviour in the presence of pits. Characteristic electrochemical noise signatures were found to correlate with characteri…
Acoustic destruction of a microcapsule having a hard plastic shell is discussed. In an ultrasonic drug delivery system, microcapsules having thin elastic shells release drugs that are contained therein when the shell is destroyed. In this paper, two subjects related to capsule destruction are discussed: the driving pu…
Abstract Long and systematic investigations of the present authors in the creation of organosilicon adsorbents, ion‐exchange and complexing agents are summarized. A wide series of such adsorption materials were synthesized by hydrolytic polycondensation and oxidizing hydrolytic polycondensation of organosilicon monome…
Asymmetric triphenylene imidazolium salts with different spacer lengths were successfully synthesized through quarternization of ω‐bromo‐substituted triphenylenes with 1‐methyl imidazole. The asymmetry in ω‐bromo‐substituted triphenylenes tended to destroy liquid crystallinity in the sample. However, highly ordered co…
Liposomes, or phospholipid vesicles, have been recognized as a potential drug delivery vehicle for three decades ([1][1]). Depending on the drug of interest, liposomes can serve as a controlled release carrier or simply as a biocompatible solubilizing vehicle for poorly soluble agents. Because of
A constitutive model that includes the effects of elasticity, crystal reorientation (twinning or detwinning), phase transformations, and plasticity is presented. The model is applied to a uranium-6wt% niobium (U-6Nb) alloy, which is known to exhibit the shape memory effect. The inelastic strains for phase transformati…
In the present review, the authors do not try to provide a comprehensive review of researches on polymer/clay nanocomposites (PCNs), but some examples to demonstrate different exfoliation processes of the clay in various polymer matrixes and the dispersed state of clay. Interaction between polymers and layered silicat…
Energy analysis of the types of orientation of smectic C * liquid crystals is performed. Criteria for the type and quality of their orientation in electrooptic elements with surfaces of orientants of different nature are revealed. An energy parameter of the optical quality of planar orientation of a smectic C * liquid…
We report the effect of processing parameters such as (1) uniaxial and (2) isostatic pressings on ferroelectric behavior of lead zirconate titanate (PZT) having Zr∕Ti ratio 65∕35. The effect of temperature (−125–250°C) on pinched loop characteristics of uniaxially pressed PZT is also reported. Polycrystalline ceramic…
The electronic and optical properties of zincblende Zn X ( X =S, Se, Te) and Zn X :Co are studied from density functional theory (DFT) based first principles calculations. The local crystal structure changes around the Co atoms in the lattice are studied after Co atoms are doped. It is shown that the Co-doped material…
It is confirmed that value of the spontaneous polarization in triglycine sulfate is reduced by a DC electric field perpendicular to its ferroelectric b axis. The reduction is influenced by temperature and by application time, intensity and direction of the perpendicular electric field. The reduced value is maintained…
This paper describes a procedure to prepare metal-oxide interfaces for transmission electron microscopy by the focused ion beam technique. The advantage of this procedure is to allow the observation of metal-oxide interfaces of irradiated samples with a homogeneous thickness without the need to have an instrument insi…