Materials Literature
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Abstract This work deals with a study of polymerization condition variables such as catalyst concentration, activator concentration, and initial polymerization temperature in the anionic polymerization of ε‐caprolactam. Ethylmagnesium bromide (EtMgBr) and sodium hydride (NaH) were used to make the catalyst composition…
The structures of the 3d divalent transition-metal diarsenates M(2)As(2)O(7) (M = Mn, Co, Ni, Zn) can be considered as variants of the monoclinic (C2/m) thortveitite [Sc(2)Si(2)O(7)] structure type with a ≃ 6.7, b ≃ 8.5, c ≃ 4.7 Å, α ≃ 90, β ≃ 102, γ ≃ 90° and Z = 2. Co(2)As(2)O(7) and Ni(2)As(2)O(7) are dimorphic. Th…
The structural, electronic, and thermoelectric properties of BiSb nanotubes are investigated using a multiscale approach which combines the first-principles pseudopotential method, semiclassic Boltzmann theory, and molecular dynamics (MD) simulations. Our calculations indicate that the gear-like nanotubes (g-NTs) are…
The structure of an induced macromolecular assembly was characterized and found to consist of an ordered heptameric arrangement of recombinant phi29 gp10 connector molecules. Insertion of an N-terminal Strep-II/His(6) tag to the connectors led to the spontaneous formation of large nanoparticles that were distinct from…
The mobility and electrochemical activity of nitrogen inside and/or at the surface of ionic compounds is of fundamental, as well as of possibly practical, relevance. In order to better understand the role of nitrogen anions in solid electrolytes, we measured the transference number of nitrogen in yttria-stabilized zir…
Purpose The purpose of this paper is to present a model to describe the nonlinear and hysteretic properties of ferromagnetic materials. Design/methodology/approach The energetic model of ferromagnetic hysteresis evolved from some well‐known concepts in ferromagnetism in the last years. The magnetisation process is cal…
Catalytic performances of alloy and surface alloy are sensitive to the surface structures and composition. In this paper we present an overall survey of the surface structure of Pd(111) covered with different amount of Zn using Monte Carlo simulations. We demonstrate that the composition of PdZn surface alloy is Zn co…
A protocol for nanostructuring and electropolymerization of a hybrid semiconductor polycarbazole-titanium oxide ultrathin film is described. Ultrathin (<100 nm) films based on polycarbazole precursor polyelectrolytes and titanium oxide (TiOx) have been fabricated by combining the layer-by-layer (LbL) and surface sol-g…
Hybrid gold nanoclusters exhibiting photoregulated release of nitric oxide are obtained by appropriate self-assembling of a suitable host, a photoactivable guest and Au nanoparticles. The excitation of the core, the shell or both components of the nanoclusters with visible light, together with their dark stability and…
A method of tuning a one-dimensional guided-mode resonance grating through the use of an air-pressure-responsive membrane is demonstrated here using finite-element method simulation. The device consists of a titanium dioxide (TiO(2)) grating structure embedded in a flexible polydimethylsiloxane membrane. This grating…
Hybridized sol–gel processing has been adopted to fabricate magnetic CoFe 2 O 4 composite thick films onto Pt/Ti/SiO 2 /Si substrate by the spin coating technique. The process includes the chemical synthesis of CoFe 2 O 4 sol–gel solution, the modified CoFe 2 O 4 particles via high‐energy ball milling, and the synthes…
A new kind of boron nitride (BN) whisker with a novel cap-stacked structure and excellent ultraviolet−visible luminescence properties has been successfully prepared via a facile chemical vapor reaction route. SEM analysis shows that the BN whiskers are uniform with a mean diameter of 1 μm and a length up to at least 1…
With the help of single molecule force spectroscopy and molecular dynamics simulations, we determine the surface-induced structure of a single engineered spider silk protein. An amyloid like structure is induced in the vicinity of a surface with high surface energy and can be prohibited in the presence of a hydrophobi…
The final morphology of the lamellar silsesquioxane produced from the (EtO)3Si(CH2)3NHC(=O)NH(CH2)12NHC(=O)NH(CH2)3Si(OEt)3 (P12) precursor using an acid-catalyst and a large excess of water was changed from rigid platelets (L12) to micro-objects that resemble sea sponges (L12D) upon simple mixing with dimethylsulfoxi…
Protein crystallization continues to be a major bottleneck in X-ray crystallography. Previous studies suggest that symmetric proteins, such as homodimers, might crystallize more readily than monomeric proteins or asymmetric complexes. Proteins that are naturally monomeric can be made homodimeric artificially. Our appr…
Nihility media in the previous literature are usually understood as media with = μ = 0. Transformation optics opens a new perspective for capturing the essence of such media. From this perspective, we generalize the definition of nihility media as transformation media derived from volumeless geometrical elements . A v…
Abstract A new efficient and mild protocol for synthesizing a series of novel bis(dipyrromethanes) with versatile arylene linkers through an indi‐ um(III) chloride‐catalyzed condensation reaction between various dialdehydes and pyrrole has been developed. This protocol is applicable to constructing a variety of bis(di…
Abstract Poly(lactic acid) (PLA) absorbable reinforcement ligaments that are used in orthopedics for the repair and reinforcement of articulation instabilities as well as PLA samples synthesized in the laboratory were studied with respect to their thermal properties, crystallization kinetics, mechanical properties, an…
Single-walled carbon nanotube (SWNT) networks were used to detect hazardous dimethyl-methyl-phosphonate (DMMP) gas in real time, employing two different metals as electrodes. Random networks of SWNTs were simply obtained by drop-casting a SWNT-containing solution onto a surface-oxidized Si substrate. Although the elec…
Polystyrene/poly(4-vinylpyridine) (PS/P4VP) particles with various morphologies such as popcorn-like (A), colloidal molecule NH(3) (B), colloidal molecule H(2)O (C) and mushroom-like (D) were generated by dynamically controlling and stabilizing the phase separation during the seeded swelling polymerization.