Materials Literature
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This work studies the behavior of a manganese dioxide catalyst during the total oxidation of methanethiol. Modifications of the working γ-MnO 2 catalyst were characterized by XPS, XRD, DRIFTS, and potentiometric measurements after reactions at different durations and at different temperatures. At temperatures below 20…
A comparison between the hydrogen storage performances of untreated and heat-treated Li 3 N was carried out using a volumetric method, temperature-programmed hydrogenation (TPH), and scanning electron microscopy (SEM). It was found that, during the first hydrogenation, the untreated Li 3 N could absorb fast (3 min), 5…
Transformers are normally designed and built for utilizing at rated frequency and perfect sinusoidal load current. Supplying non-linear loads by transformer leads to higher losses, early fatigue of insulation, premature defectiveness and reduction of the useful life of the transformer. To prevent these problems, rated…
Abstract Summary: It has been a real challenge to form carbon nanotube (CNT)/polymer composites where CNTs are well‐dispersed in the polymer matrix and the interactions between CNTs and polymers are effectively strong. In this paper, we applied surface‐initiated, ring‐opening polymerization (SI‐ROP) of p ‐dioxanone (P…
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Abstract A styrene‐acrylic/SiO 2 nanoparticle composite emulsion was prepared by using SiO 2 nanoparticles as seeds. The effect of factors such as the level of nano‐SiO 2 , reaction temperature and ultrasound treatment of nano‐SiO 2 on the stability of the polymerization reaction was investigated. Water‐resistance of…
Abstract The effect of the degree of crystallinity on the dynamic mechanical relaxation behaviour (flexural storage modulus and loss tangent) of polycaprolactone has been investigated. The degree of crystallinity was found to determine the temperature of the α‐relaxation process and the relaxation strength of the β‐re…
We investigate viscous fingering instabilities of the double-front system which results when fluid is injected into a porous medium containing fluid of a different composition and temperature. We describe a linear stability analysis based on an eigenfunction expansion method which enables us to investigate the structu…
Poly(ethylene oxide) (PEO) and poly(perfluorohexylethyl methacrylate) (PFMA) containing amphiphilic block copolymers have been investigated for their interfacial behavior and their penetration into 1,2-diphytanoyl- sn -glycero-3-phosphocholine (DPhPC) monolayer at the air/water interface by measuring surface pressure…
Three new complexes of the formula M(2)L(2) derived from 2-(4-quinolyl)nitronyl nitroxide (4-QNNN) and M(hfac)(2) [M = Mn(II), Co(II), and Cu(II)], (4-QNNN)(2).[Mn(hfac)(2)](2) (1), (4-QNNN)(2).[Co(hfac)(2)](2).2H(2)O (2), and (4-QNNN)(2).Cu(hfac)(2).Cu'(hfac)(2) (3), were synthesized and characterized structurally as…
Lipophilic N-bonded silanetriol RSi(OH)(3) (R=(2,6-iPr(2)C(6)H(3))N(SiMe(3))) can be utilized as an effective synthon for building a variety of multimetallic assemblies containing the Si-O-M motif. The type of metallosiloxane synthesized-its nuclearity and its molecular topology-can be readily modulated by the choice…
Long double-walled carbon nanotubes (DWNTs) could be synthesized in a production rate of about 0.5 g per h by an improved catalytic chemical vapor deposition method using xylene solution as carbon feedstock. The argon flowing rate affects the growth of DWNTs sensitively. Raman spectra and HRTEM images show that the DW…
The surface structure of sulfated zirconia (SZ) is examined by density-functional theory (DFT) with periodic boundary conditions. Adsorption of H 2 O and SO 3 (or H 2 SO 4 ) on the (101) surface of tetragonal zirconia is studied for different loadings up to H 2 SO 4 ·3H 2 O and 2H 2 SO 4 ·2H 2 O per two surface unit c…
Using mesoscale dissipative particle dynamics (DPD) simulations, which ignore all atomistic details, we show the formation of lamella mesophases by cooling a fully disordered system composed of symmetric (A7B7) rod-coil diblock copolymers. Equilibration is achieved very rapidly using DPD, and isotropic, smectic A and…
Several strategies are demonstrated for the use of additive‐driven chemistries that take place in only one type of the nanosized domains of all‐organic and organic–inorganic hybrid block copolymer thin films. Such an approach is used to examine the convergence of “top–down” and “bottom–up” fabrication via light‐driven…
Silsesquioxanes-based nanoparticles synthesized by hydrolytic condensation of a functionalized precursor, N, N -di(2,3-dihydroxypropyl)(aminopropyl)triethoxysilane, (HOCH 2 CH(OH)CH 2 ) 2 NCH 2 CH 2 CH 2 Si(OCH 2 CH 3 ) 3, were characterized using MALDI-TOF MS, NMR, elemental analysis, FT-IR, transmission electron mic…
Ultraporous thin polymer films (see Figure) are generated using physical constraints imposed by external surfaces (hard plates) and internal surfaces (hard nanoparticles and soft micelles) via foaming with supercritical CO 2 . The constraints serve as diffusion barriers and/or heterogeneous nucleation sites. Use of CO…
A new pyridine-containing ligand, N,N'-bis(6-carboxy-2-pyridylmethyl)ethylenediamine-N,N'-diacetic acid (H(4)L), has been designed for the complexation of lanthanide ions. (1)H and (13)C NMR studies in D(2)O solutions show octadentate binding of the ligand to the Ln(III) ions through the nitrogen atoms of two amine gr…
Compacted unbound granular materials are extensively used as sub-layer in pavement design. Most pavement design guides assume that they are responsible for the degradation and deformation of the roads and railways that they support. Biaxial tests are usually employed to investigate the elasto-plastic response of these…
The extreme polar morphology that has been observed for crystals of the stable form of a steroid is explained by a molecular dynamics simulations approach. The habit modification is caused by surface−solvent interactions, which affect the growth rate of the polar faces differently. The same effect was observed for the…