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。
We report the results of electrical resistivity, magnetic susceptibility and thermoelectric power measurements on the stoichiometric hole-doped La(0.8)Ca(0.2)MnO(3) and electron-doped La(0.8)Ce(0.2)MnO(3) manganites. The resistivity and thermopower data show a metal-insulator phase transition for both samples. Magneti…
New fluorescent azobenzene dyes and side-chain polymers have been synthesized and characterized and their photophysical properties studied. A series of azobenzene dyes having different fluorophores such as phenol (S1), phenylphenol (S2) and naphthol (S3) incorporated in them were synthesized. S2 had unusually high flu…
Efficient green and red upconversion emissions in Er3+/Yb3+ co-doped ZnAl2O4 phosphor obtained by combustion reaction, de Camargo, A S S, Nunes, L A O, Silva, J F, Costa, A C F M, Barros, B S, Silva, J E C, de Sá, G F, Alves, S
Abstract The rheological behavior of poly(vinyl pyrrolidone) (PVP)/ N,N ‐dimethylformamide (DMF) solutions containing metal chlorides (LiCl, CaCl 2 , and CoCl 2 ) were investigated, and the results showed that the nature of the metal ions and their concentration had an obvious effect on the steady‐state rheological be…
Sol-gel processes refer to the transition of predefined compositions of inorganic alkoxides precursors from liquid sol phase to solid gel phase. The phenomenon of sol-gel was known to mankind for more than 150 years. It is because of concerted efforts of researchers from multidisciplinary fields, sol-gel science trans…
We report herein the feasibility of CdSe nanoparticle synthesis in high-temperature water. The base-case experimental conditions ( T = 200 °C, Cd/Se molar ratio = 8:1, and a reaction time, t, of 1.5 min) produced nanoparticles that exhibited quantum confinement behavior. The quantum yield was 1.5%, but it was easily i…
A series of four porphyrin-retinamides containing either all-trans- or 13-cis-retinoid acid residues, directly linked to the para-phenyl position of meso-tetraphenylporphyrin or via a low-molecular-weight PEG spacer, have been synthesized. The biological properties of these conjugates were evaluated in a model cell li…
Gold nanoparticles with enhanced efficiency as substrates for surface-enhanced Raman and infrared spectroscopies have been grown by pulsed laser deposition on glass and CaF 2 substrates. Transmission electron microscopy analysis has evidenced the presence of nanoparticles with characteristic sizes of several nanometer…
We report fully three-dimensional atomistic molecular dynamics studies of grain growth kinetics in nanocrystalline Cu of $5\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ average grain size. We observe the formation of annealing twins as part of the grain growth process. The grain size and energy evolution was monitored as a…
A theoretical model for nanofiber growth of polyaniline (PANI) is proposed in consideration of the classical nucleation/growth theory and the structure of electric double layers, and then the correlation between the fibrillar growth of PANI and its optical activity is investigated in the present work. The formation of…
Challenging commercial polycarbonate: Suzuki polycondensation afforded a high-molar-mass poly(meta-phenylene) (see structure) which displays not only outstanding toughness, convenient processability, and a high glass-transition temperature, but also considerable resistance against environmental stress-cracking; thus,…
Abstract Natural‐fiber‐reinforced polymers can exhibit very different mechanical performances and environmental aging resistance depending on their interphase properties. A lack of good interfacial adhesion and poor resistance to moisture absorption make oil palm fibers less attractive as reinforcing agents. To improv…
Abstract We have conducted atomistic molecular dynamics (MD) simulations of poly(dimethylsiloxane) (PDMS) melts in contact with bare silica and modified (with hydroxyl and trimethylsiloxy groups) silica surfaces using a quantum chemistry‐based force field. MD simulations accurately predicted changes in PDMS dynamics w…
Investigation of the catalytically relevant gamma-diiron(III) Keggin complexes in aqueous acetate buffer leads to a dimeric C(2v)-symmetric polyanion, [{Fe(OH)(OAc)}(4)(gamma-SiW(10)O(36))(2)](12-) (3) and a trimeric C(2)-symmetric polyanion, [{Fe(6)(OH)(9)(H(2)O)(2)(OAc)(2)}(gamma-SiW(10)O(36))(3)](17-) (4). Polyanio…
Research on the properties and applications of molecules doped into sol-gel-derived silica matrices has expanded rapidly. This Account begins with a brief review of the use of the dopant molecules as probes of the changes that occur as the system evolves from the initial sol to the final xerogel during the formation o…
The reaction of 1-formyldipyrromethane (100 mM) in toluene at 115 degrees C containing DBU (10 mol equiv) and MgBr2 (3 mol equiv) in the presence of air affords the magnesium chelate Mg(II) porphine in 30-40% yield. The advantages of the new method include simplicity, high concentration, chromatography-free purificati…
A band gap-electrogenerated chemiluminescence (ECL) of ZnS nanoparticles (NPs) in alkaline aqueous solution was first observed at a platinum electrode during the potential applied between −2.0 V (versus Ag/AgCl, saturated KCl) and +0.86 V. The ECL peak of ZnS NPs in 0.10 M sodium hydroxide solution appeared at +0.86 V…
An underwater bioadhesive generally comprises a multiprotein complex that provides a molecular basis for self-assembly. We report here a new class of self-assembling peptide inspired by a 20 kDa barnacle cement protein. Studies on the chemically synthesized 24-residue peptide have revealed that (1) it underwent irreve…
Rounding up the POSSe: Polyhedral oligomeric silsesquioxanes (POSS), one of the smallest hybrid nano building blocks, were weaved into multifunctional hierarchical mesoporous hybrid materials. The mesoporous organic–inorganic hybrid material was synthesized by coassembly and condensation of the POSS compound around th…
The preparation of porous hierarchical architectures that have structural features spanning from the nanometer to micrometer and even larger dimensions and that exhibit certain functionalities is one of the new challenging frontiers in materials chemistry. The sol-gel process is one of the most promising synthesis rou…