Materials Literature
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The first radical end-coupling synthesis of polydimethylsiloxane (PDMS)−γ-cyclodextrins (γ-CDs) based polyrotaxane is reported. Conversely to usual chemical way, the radical process leads to fast both controlled size and structure with minimal side reaction while exhibiting very high conversion rate (w/w, 80%). Pure P…
The abstract of the second part of this paper is included in the abstract of part 1.
Density functional theory (DFT) and time-dependent density functional theory (TDDFT) were used to study optical and electrochemical properties of a new series of dye sensitizers for use in dye-sensitized solar cells (DSSCs). The dyes include triphenylamine (TPA) unit as an electron donor and cyanoacrylic acid moiety a…
The elastic, electronic, and optical properties of Cu 3 MTe 4 (M = Nb, Ta) are investigated for the first time using the density-functional formalism. The optimized crystal structure is obtained and the lattice parameters are compared with available experimental data. Different elastic moduli are calculated. The Born…
采用机械球磨混粉和真空烧结相结合的方法制备了Fe-Cu-Mo-C合金,研究了不同烧结温度对粉末冶金Fe-Cu-Mo-C合金材料的显微组织、密度、抗拉强度和摩擦磨损性能的影响。结果表明：随着烧结温度由1 000℃升高到1 100℃,Fe-Cu-Mo-C合金烧结体组织孔隙数量减少、孔隙尺寸明显降低;当烧结温度提高到1 150℃时,烧结体组织中孔隙尺寸增大。随着烧结温度升高,烧结体的密度、硬度、抗拉强度和伸长率先增大后减小,磨损量先降低后升高。最佳烧结温度为1 100℃,此时烧结体的密度为6.90 g/cm3,抗拉强度为319 MPa,洛氏硬度为34.7 HRC,磨损量为0.087 g。
Abstract In this paper a solution for the one-dimensional steady state Multilayer Multigroup Neutron Diffusion Equation in cartesian geometry by Fictitious Borders Power Method and a perturbative analysis of this solution is presented. For each new iteration of the power method, the neutron flux is reconstructed by po…
Thermodynamic properties of sodium gluconate (SG) aqueous solution have been measured over the 303.15–343.15 K temperature range including solubility, density, and viscosity. For proper crystallization of SG, the kinetics of evaporative crystallization with spontaneous nucleation was subsequently investigated in a sem…
Las fibras vegetales son estructuras celulares conformadas por diferentes polimeros de celulosa, hemicelulosa, pectina y lignina, importantes a nivel mundial en el proceso textil, alimentario e industrial. Esta revision recopila extensos estudios que se han realizado en torno al desarrollo de las fibras, clasificacion…
We measure magnetization and structural dynamics in two intercalant-ordered transition metal dichalcogenides: Fe0.25TaS2 and Mn0.25TaS2. The structurally equivalent materials allow us to probe the effect of orbital angular momentum which is active in Fe0.25TaS2 and absent in Mn0.25TaS2. Interestingly, we find that the…
8-Methoxy-1-tetralone was synthesized in a concise and efficient manner involving a sequential palladium-mediated cross-coupling reaction (Heck), catalytic hydrogenation, and intramolecular acylation mediated by Eaton’s reagent or Lewis acids. The pivotal step in the synthesis was the use of a bromine substituent at t…
Abstract Photocurable materials which are obtained on the basis of urethane acrylate resins are often used in the industry for the production varnishes or protective coatings. The main disadvantage which is connected with the utilization of these varnishes is their unpleasant smell during the process of production and…
In addition to its cytoprotective effects, growth hormone-releasing peptide 6 (GHRP-6) proved to reduce liver fibrotic induration. CD36 as one of the GHRP-6 receptors appears abundantly represented in cutaneous wounds granulation tissue. The healing response in a scenario of CD36 agonistic stimulation had not been pre…
In the present study, a polyethylene terephthalate (PET) artificial ligament was coated with an organic layer‑by‑layer (LBL) self‑assembled template of chitosan and hyaluronic acid, and then incubated in a calcium phosphate (CaP) solution to prepare a biomimetic CaP coating. The surface characterization of the ligamen…
Efficient high-energy passively Q-switched laser operation was demonstrated with Yb:Ca3La2(BO3)4 disordered crystal, producing an average output power of 3.0 W at 1018.7 nm, at a pulse repetition frequency of 5.0 kHz; the resulting pulse energy, duration, and peak power were 600 μJ, 5.3 ns, and 113.2 kW, respectively.
A simple protocol for the in situ generation of platinum nanoparticles in a poly(vinyl alcohol) (PVA) thin film is developed. Chloroplatinic acid as well as potassium platinum(II) chloride are used as precursors and the film is fabricated by spin coating followed by mild thermal annealing. The chemical process occurri…
A large, resistant buildup at the top of the Upper Ordovician (Hirnantian?) Red Head Rapids Formation on Southampton Island (Nunavut, Arctic Canada) is dominated by massive boundstone and cementstone facies. These massive facies have more in common with the sponge–microbial reefs that dominated worldwide in the Early…
A numerical model has been developed using the explicit FE code LS-DYNA in order to study the effect of geometrical and material parameters on the low-velocity impact response of carbon nanotube (CNT)/polymer nanocomposites. The model is based on a Representative Volume Element (RVE). The RVE is prismatic with a recta…
Abstract A platinum(II) complex Pt(DiBrbpy)Cl2 (1) based on 4,4′‐dibromo‐2,2′‐bipyridine ligand was synthesized and characterized. Interestingly, two solvated phases of 1 with different amounts of crystalline CH2Cl2 molecules, 1·1/3(CH2Cl2) (yellow) and 1·3/2(CH2Cl2) (red), were obtained. In the solid state, 1·1/3(CH2…
In this paper zeolite Beta was synthesized and characterized by XRD, ATG, ATD, XRF and SEM. Subsequently various modifications were made using a surface passivation process in liquid phase with tetraethylorthosilicate (TEOS), using two loads of TEOS and three passivation cycles, in order to obtain six catalysts. These…
Objective : This study aims to investigate the green synthesis of silver nanoparticles (AgNPs) Melothria maderaspatana (MM), and evaluation of their antibacterial activities for the first time. It is observed that MM leaf extract can reduce silver ions into AgNPs. Methods: The obtained particles were analyzed by UV-vi…