Materials Literature
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。
Natural polymers have many advantages over their synthetic counterparts for biomedical uses; carbohydrate is a class of under-explored natural polymers for gene delivery. We have formulated microspheres and wafer matrices from Hyaluronan (HA) for delivery of plasmid DNA (pDNA). Sustained releases of pDNA over a period…
Purpose The purpose of this paper is to show the effect of cinnamoylmalononitrile (CMN) compounds on the corrosion inhibition of carbon steel in HCl and the effect of some substituent groups on the corrosion inhibition. Design/methodology/approach Several papers have been published (1900‐1999), which aimed to investig…
The reaction of MnBr(2) and [PPN](2)[S,S-C(6)H(3)-R] (1:2 molar ratio) in THF yielded [(THF)Mn(S,S-C(6)H(3)-R)(2)](-) [R = H (1a), Me (1b); THF = tetrahydrofuran]. Formation of the dimeric [Mn(S,S-C(6)H(3)-R)(2)](2)(2-) [R = H (2a), Me (2b)] was presumed to compensate for the electron-deficient Mn(III) core via two th…
The magnetic properties of the layered compound Cu 2 (OH) 3 (CH 3 COO)·H 2 O ( 1 ) have been investigated in details. The behavior indicates that the Cu II O 2 layers are weakly ferromagnetic and order antiferromagnetically below T N = 12 K. At low temperature the compound exhibits a metamagnetic transition with the t…
The 1H spin–lattice relaxation times and high-resolution solid-state nuclear magnetic resonance (NMR) under fast magic spinning were used to study the structural dynamics in the proton-conducting material imidazolium oxalate. The measurements provide evidence for the ordered and disordered domains within the studied m…
The optical resonance of gold nanoparticles placed at nanometre distances from a gold surface by means of a dielectric spacer was investigated. Different types of molecules, 2-aminoethanethiol and shape-persistent polyphenylene dendrimers were used as spacers and compared. Furthermore, the gold nanoparticle size and t…
The influence of treating the coatings obtained by plasma electrolytic oxidation (PEO) and various fractions of polytetrafluoroethylene on the state of the surface of formed composite layers has been studied by electrochemical impedance spectroscopy, differential thermal analysis, and thermogravimetry. Differences in…
Early structure models of crystals go back to the 17th century.1, 2 By studying the external regularity of the crystals and their optical properties, an arrangement of the fundamental particles as shown in Figure 1(a) was suggested without actual knowledge of their size and nature. It took about 200 years until the mo…
Low-temperature transmission electron microscopy and x-ray diffraction (XRD) studies have been carried out on pellet and powder samples of ${\text{Pr}}_{0.5}{\text{Ca}}_{0.5}{\text{MnO}}_{3}$. These studies have revealed appearance of a different type of charge-orbital ordered (COO) phase, resulting due to flipping of…
We present the experimental ELNES spectra of the Cr-L 2,3 and O-K edges in three high pressure synthesized perovskites, ACrO 3 (A = Ca, Sr and Pb). A comparison of the experimental spectra against the theoretical calculations shows the influence of the A cation in the features of the spectrum. The Cr-L 2,3 multiplet s…
A theoretical model is proposed for the (0,0,1) superlattice manganite system ${({\text{LaMnO}}_{3})}_{n}{({\text{SrMnO}}_{3})}_{m}$. The model includes the electron-electron, electron-phonon, and cooperative Jahn-Teller interactions. It is solved using a version of the single-site dynamical mean-field approximation g…
Crystalline purple [PPh4][FeIIIL2] (1), where L2- represents the closed-shell dianion of 4,6-di-tert-butyl-2-[(pentafluorophenyl)amino]benzenethiol, has been synthesized from the reaction of H2L and FeBr2 (2:1) in acetonitrile with excess NEt3, careful, brief exposure of the solution to air, and addition of [PPh4]Br.…
We study electric field driven deracemization in an achiral liquid crystal through the formation and coarsening of chiral domains. It is proposed that deracemization in this system is a curvature-driven process. We test this prediction using the recently obtained exact result for the distribution of hull-enclosed area…
Purpose Thioureas (TUs) have been studied extensively, but their inhibition mechanism is not fully understood. Experimental results and theoretical calculations were used to investigate the effect of TU and its derivatives on the corrosion reaction of mild steel in 1 M H 2 SO 4 at 40°C. An attempt was made to correlat…
SUMMARY A marine araphid pennate diatom obtained from sand grains sampled at two sites at Vigo, Spain is described as Psammogramma vigoensis S. Sato et Medlin, a member of the family Plagiogrammaceae, based on observations of frustule fine structure. The species possesses elongated valves with apical pore fields and p…
ADVERTISEMENT RETURN TO ISSUECommunicationNEXTSynthesis of a New Member in Iron-Based Layered Superconductor: Nd0.8Th0.2OFeAs with Tc = 38 KMin Xu, Fei Chen, Cheng He, Hong-Wei Ou, Jia-Feng Zhao, and Dong-Lai Feng*View Author Information Department of Physics, Surface Physics Laboratory (National Key Laboratory), Adva…
We investigate the resolution and absorption losses of a Ag/GaP multilayer superlens. For a fixed source to image distance the resolution is independent of the position of the lens but the losses depend strongly on the lens placement. The absorption losses associated with the evanescent waves can be significantly larg…
We report an ab initio study of Pb antisite defects in ${\text{PbZrO}}_{3}$ (PZ) and $\text{Pb}(\text{Zr},\text{Ti}){\text{O}}_{3}$ (PZT) perovskites. Also, we calculated the enthalpy of formation of PZ. Our results show that, under strong oxidizing conditions, Pb on the Zr-site antisite defects are unavoidable in PZ.…
Polyaniline (PANI) is capable of inhibiting corrosion on iron by inducing the formation of a passive oxide film. The underlying mechanism however, is unknown. We have used photoelectron emission spectromicroscopy of thin films of a model PANI oligomer to investigate its interaction with the iron oxide film covering th…
A structural phase transition is shown around 400 K for the thermoelectric lamellar misfit cobalt oxide [Ca2CoO3][CoO2]1.62. This transition is related to a rearrangement of the central [CoO] layer of the [Ca2CoO3] slab of this structure, characterized by a commensurate intrinsic modulation q2 = 2/3a*-1/3c*. The parti…