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。
Alanine (13)CH(3) methyl groups can serve as a useful addition to the Ile, Leu, Val (ILV) selective isotope labeling methodology adopted for NMR studies of high-molecular-weight protein systems. A four-dimensional (4D) methyl-detected "out-and-back" NMR experiment has been developed that allowed us to obtain practical…
β-Bromo glycerol monoethers, when heated with pyridine at 100 °C for 10 h, gave a new glycerol-based pyridinium cationic surfactant, 1-(1-(2,3-dihydroxypropoxy)alkane-2-yl)pyridinium bromide ( 6a − 10a )/1-(2-(2,3-dihydroxypropoxy)alkyl)pyridinium bromide ( 6b − 10b ) in a yield of 60%−70%. The surface properties and…
We present a full configuration interaction study of Be(N) (N=2,3,4,5) linear chains. A comparative study of the basis-set effect on the reproduction of the energy profile has been reported. In particular, the 3s1p, 4s2p, 4s2p1d, 5s3p2d, and 5s3p2d1f bases were selected. For the smallest chains (i.e., Be(2) and Be(3))…
Biofunctionalized surfaces based on dendronized cellulose were prepared either by embedding 6-deoxy-6-(1,2,3-triazolo)-4-polyamidoamine (PAMAM) cellulose (degree of substitution, DS 0.25), obtained by homogeneous conversion of 6-deoxy-6-azido cellulose with propargyl-PAMAM dendron via the copper-catalyzed Huisgen reac…
We used density functional theory calculations to probe the chemical reactivity of graphene and single-wall carbon nanotubes (CNTs) toward the small molecules O(2), H(2), N(2), C(2)H(2), CO, and CO(2). We found that there is a threshold CNT size below which C(2)H(2) and CO, typical feedstock precursors for CNT growth,…
Abstract We report on a new strategy for fabricating well‐defined POSS‐based polymeric materials with and without solvent by frontal polymerization (FP) at ambient pressure. First, we functionalize polyhedral oligomeric silsesquioxane (POSS) with isophorone diisocyanate (IPDI). With these functionalized POSS‐containin…
A one-step method combining spray pyrolysis and thermal chemical vapor deposition (CVD) processes was developed to grow hybrid carbon nanotube (CNT)-bimetallic composite particles. Nickel, aluminum, and acetylene were used as the catalytic site, noncatalytic matrix, and hydrocarbon source, respectively. The bimetallic…
Low-lying isomers of homoleptic gold thiolate clusters (AuSR)(N) (N = 6-12) are studied by using a global-minimum search method. Besides previously known zigzag crown structures for (AuSR)(N) (N = 6-12) and catenane structures for (AuSR)(N) (N = 10, 12), onset of a new structural family of double helical structures in…
Abstract Co(OH) 2 that blooms : Flowerlike hollow spherical architectures of cobalt hydroxide obtained through a facile solvothermal process are reported for the first time (see picture). Their growth process involves aggregation of cobalt hydroxide nanoparticles into solid spheres and a hollowing effect through subse…
Abstract Kinetics of the anionic ring opening copolymerization of 2,4,6‐tris(3,3,3‐trifluoropropyl)‐2,4,6‐trimethylcyclotrisiloxane (F 3 ) with hexamethylcyclotrisiloxane (D 3 ) was studied in THF using BuLi as the initiator. The apparent reactivity ratios were estimated by computer simulation to r = 0.10 ± 0.02, r =…
Three-dimensionally (3D) aligned, high-density, hierarchically structured single crystalline W 18 O 49 nanowires have been built on carbon microfibers of commercially available carbon paper via a chemical vapor deposition (CVD) technique without the use of a catalyst or vacuum system. The resultant W 18 O 49 nanowires…
This work highlights the results of recent efforts to understand the hierarchical self-assembly and dynamics of polypeptides with the aid of different NMR techniques, X-ray scattering, and dielectric spectroscopy. The concerted application of these techniques sheds light on the origin of the glass transition, the pers…
The structural, electrical and magnetic properties of Ni-doped ZnO films with different Ni concentrations ( x = 0–0.11, x : Ni concentration) and thicknesses ( d = 15–330 nm, d : film thickness) prepared by radio-frequency magnetron sputtering have been systematically investigated. The structural characterizations ind…
Gold deposition on Hombikat UV100 was found to negatively affect the activity of this Anatase catalyst in selective photo-oxidation of cyclohexane. By ammonia TPD and DRIFT spectroscopy it was determined that the Au deposition procedure leads to a significant decrease in OH-group density (mol m−2 BET) on Hombikat, sug…
The use of photolabile protecting groups (PGs) as a means to create latent hydrophilic surfaces is presented. Naturally hydrophobic PGs, based on o-nitrobenzyl chemistry, are used on polymer side chains, poised for cleavage upon exposure to UV light. Removal of the PGs liberates the hydrophilic polymer, thereby switch…
Despite being the subject of intensive investigations, many aspects of the mechanism of the zinc-dependent medium chain alcohol dehydrogenase (MDR) superfamily remain contentious. We have determined the high-resolution structures of a series of binary and ternary complexes of glucose dehydrogenase, an MDR enzyme from…
Abstract Triglycerides with acrylate functionality were prepared from a new route that involves the singlet oxygen photooxygenation of high oleic sunflower oil and further reduction of the resulting hydroperoxide derivatives to a mixture of secondary allylic alcohols. These unsaturated alcohols can be further reduced…
We present experimental and numerical investigations of planar terahertz metamaterial structures designed to interact with the state of polarization. The dependence of metamaterial resonances on polarization results in unique amplitude and phase characteristics of the terahertz transmission, providing the basis for po…
Three-dimensional hexagonally packed PLLA nanohelices in the PS matrix were formed in the self-assembly of PS-PLLA chiral block copolymer. After hydrolysis of the PLLA blocks, PS with hexagonally packed helical nanochannels can be fabricated and treated as the template for the following sol-gel process. Subsequently,…
Devido aos escassos trabalhos brasileiros sobre a estrutura dos grânulos de amido, o objetivo desta revisão foi demonstrar os avanços atuais na elucidação da arquitetura e da estrutura química desse polímero. Muitas pesquisas sobre a avaliação da relação existente entre a estrutura molecular do amido e seu comportamen…