Materials Literature
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In the study described in this paper we deposited gold, silver and copper on γ-Al2O3 as nanoparticles (<4 nm) and investigated the behavior of these nanoparticles in the preferential oxidation of CO in presence of H2. In addition, the effect of addition of CeO x and/or Li2O was investigated. All the three metals show…
Phase transformation by grinding has been studied in heat‐treated 2.5% molar Y‐TZP with a duplex tetragonal–cubic microstructure developed by exposure at 1650°C for different times as well as in specimens with a large amount of monoclinic phase induced by prior aging at 300°C in air. For the grinding process used, it…
Starting from the Mott insulator picture for cubic vanadates, we derive and investigate the model of superexchange interactions between ${\mathrm{V}}^{3+}$ ions, with nearly degenerate ${t}_{2g}$ orbitals occupied by two electrons each. The superexchange interactions are strongly frustrated and demonstrate a strong in…
We propose a Landau-de Gennes variational theory fit to simultaneously describe isotropic, nematic, smectic- A , and smectic- C phases of a liquid crystal. The unified description allows us to deal with systems in which one, or all, of the order parameters develop because of the influence of defects, external fields a…
Abstract The nonisothermal crystallization and melting behavior of LDPE and LDPE/Al nano‐ and microcomposites prepared from melt compounding were studied using differential scanning calorimetry (DSC). The DSC results show that the Al nanoparticles can either facilitate or hinder the crystallization of LDPE, depending…
Carbon nanotubes (CNTs) are considered as promising candidates for transmission lines as well as microcircuit interconnects in future nanoscale electronic systems. Owing to the growing interest in the use of microwave signals, understanding the transmission properties at high frequencies is essential to assess the app…
Abstract Conducting polypyrrole (PPy) has been synthesized by the in situ gamma radiation‐induced chemical oxidative polymerization method. This method takes advantages of the specialties of radiation‐induction, and a highly uniform polymer morphology was obtained. The resultant nanosize polypyrrole particles were cha…
Abstract ZrO 2 and HfO 2 nanoparticles are homogeneously dispersed in SiO 2 matrices (supported film and bulk powders) by copolymerization of two oxozirconium and oxohafnium clusters (M 4 O 2 (OMc) 12 , M = Zr, Hf; OMc = OC(O)–C(CH 3 )CH 2 ) with (methacryloxypropyl)trimethoxysilane (MAPTMS, (CH2C(CH 3 )C(O)O)–(CH 2…
A novel polyazomethines bearing triphenylamine core and a proper model compound were synthesized and their spectroscopic (FTIR, 1 H NMR) and optical (UV-vis, photoluminescence) properties and also a molecular dynamic calculations were investigated. The polymers which were soluble in organic solvents (chloroform, dimet…
The mechanical properties of magnesia–spinel composite ceramics, which are candidate materials for supporting solid oxide fuel cells, have been measured as a function of porosity (up to 30%) and temperature (up to 900°C). The theory for the ring‐on‐ring test has been re‐examined to resolve an inconsistency in the lite…
Brushing the surface: Structured polymer brushes are readily prepared by site-selective immobilization of initiators in a self-assembly process by Langmuir–Blodgett lithography with subsequent polymerization. The AFM images show a DPPC/alkoxy amine LB film before and after surface-initiated controlled nitroxide-mediat…
Abstract One‐pot synthesis of pH‐responsive PEGylated nanogels (diameter <100 nm) containing gold nanoparticles (AuNPs) was successfully carried out through the autoreduction of HAuCl 4 with PEGylated nanogels constructed from cross‐linked poly[2‐( N , N ‐diethylamino)ethyl methacrylate] (PDEAMA) core and tethered…
Synthesis of ZnS nanocrystals with controllable structure and morphology and their photoluminescence property, Li, Zepeng, Liu, Bingbing, Li, Xianglin, Yu, Shidan, Wang, Lin, Hou, Yuanyuan, Zou, Yonggang, Yao, Mingguang, Li, Quanjun, Zou, Bo, Cui, Tian, Zou, Guangtian, Wang, Guorui, Liu, Yichun
Abstract Seeding is discussed from the viewpoint of reproducible process actuation. Seeded experiments in a 75‐l Draft‐Tube (DT) crystallizer were performed in triplicate to verify reproducibility of the product characteristics. The seeded experiments displayed a significantly improved reproducibility of the results i…
A methodology to allow the deliberate design of solid precursors to affect the solid‐state synthesis of materials has proven elusive. We have designed a conceptual synthesis route for M n +1 AX n phases that does not involve the usual intermediate phases. Instead, it is proposed that the common structural units within…
In this paper we report the synthesis of single-walled carbon nanohorns (SWNHs) and highly convoluted graphene sheets by AC powered arc discharge in air. The experimental strategy was based on the design of an experimental set-up able to enhance the synthesis of these compounds at the expense of the usually found cath…
Abstract The rheological, thermal, and mechanical properties of blends consisting of a linear high melt flow rate polypropylene (PP) and two branched PPs are characterized in detail. Blends containing branched PPs display evidence of miscibility in the melt state and exhibit high melt elasticity together with signific…
The thermal properties of hcp metals Mg, Ti, and Zr are investigated by performing density functional theory and density functional perturbation theory calculations within the quasiharmonic approximation. The temperature dependence of various quantities such as the anisotropic thermal expansion, the heat capacity, bul…
We propose a novel method to measure time-dependent linear susceptibilities in molecular simulations, which does not require the use of nonequilibrium simulations, subtraction techniques, or fluctuation-dissipation theorems. The main idea is an exact reformulation of linearly perturbed quantities in terms of observabl…
We produced core–shell (CdSe)ZnSe quantum dots by direct colloidal chemical synthesis and the surface-passivation method—an overcoating of the core CdSe with a larger-bandgap material ZnSe. The (CdSe)ZnSe quantum dots(QDs) play the role of a colour conversion centre. We call these quantum dots nanophosphors. We fabric…