Materials Literature
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We show that the asymmetric crystal environment of the V site in the ladder compound NaV$_{2}$O$_{5}$ leads to a strong coupling of vanadium 3d electrons to phonons. This coupling causes fluctuations of the charge on the V ions, and favors a transition to a charge-ordered state at low temperatures. In the low temperat…
It is clarified for the first time that solitons originating from the dipolar interaction in ferromagnetic nano-particle arrays are stably created. The characteristics can be well controlled by the strength of the dipolar interaction between particles and the shape anisotropy of the particle. The soliton can propagate…
Lattice-matched (Δa/a=0.09%) ScAlMgO4(0001) substrates were employed to grow single crystalline quality ZnO films by laser molecular-beam epitaxy. Extremely smooth surface represented by atomically flat terraces and half unit cell (0.26 nm) high steps and extremely small orientation fluctuations both in-plane (&lt…
This letter describes a technique for generating waves on polydimethylsiloxane (PDMS) patterned in bas-relief. The PDMS is heated, and its surface oxidized in an oxygen plasma; this oxidation forms a thin, stiff silicate layer on the surface. When the PDMS cools, it contracts and places the silicate layer under compre…
A thermotropic liquid crystal, 4,4′-dibutylazobenzene, added in a 1% weight proportion to thermoplastic materials, polystyrene (PS) and styrene acrylonitrile (SAN), gives, after molding the mixture at 150°C and 22 MPa, a new family of polymers with an improved resistance to sliding dry wear against steel as tested in…
The tensile deformation and fracture behavior of commercially available low-density polyethylene (LDPE) films, having different molecular characteristics, was studied. Submitting samples to specific thermal histories controlled the morphological structure of these semicrystalline polymers. Phase-structure analysis of…
Polycarboxylic acids have been used as crosslinking agents for wood pulp cellulose for improving paper wet strength. Our previous research showed that low-molecular-weight polymeric carboxylic acids are effective in improving paper wet strength retention and reducing its flexibility. In this research, we compared two…
Jute yarns treated with MMA + MeOH solutions were irradiated either with Co-60 gamma source or with UV radiation. In gamma radiation, polymer loading of MMA (methyl methacrylate) onto jute increased quite substantially, but the strength of the composite decreases sharply after 15% polymer loading. The gamma-treated ju…
We have investigated spreading of superfluid $^{4}$He on top of polished MgF$_2$ and evaporated SiO$_{2}$ substrates. Our results show strongly varying contact angles of 0 - 15 mrad on the evaporated layers. According to our theoretical calculations, these contact angles can be explained by a spatially varying distrib…
Within the framework of mean field theory, we examine the phase transitions in Ising magnetic films and superlattices. By transfer matrix method, we derive two general nonlinear equations for phase transition temperatures of Ising magnetic films and superlattices, respectively. The equations can be applied to the film…
A model of elastic bounded diffusion is presented for the quantitative analysis of the dynamics of redox probes borne by the loose ends of linear and flexible polymeric chains terminally grafted to building blocks of a self-assembled construction. Experimentally, poly(ethylene glycol) chains bearing a ferrocene probe…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTStructural Characterization of Meso Aryl SapphyrinsAlagar Srinivasan, Anand V. G, S. Jeyaprakash Narayanan, Simi K. Pushpan, M. Ravi Kumar, Tavarekere K. Chandrashekar, Ken-ichi Sugiura, and Yoshiteru SakataView Author Information Department of Chemistry, Indian Institute of Te…
CuO x /ZrO 2 samples prepared by adsorption from copper solutions or by impregnation were characterized by means of FTIR, XPS, ESR, DRS, volumetric CO adsorption, and redox cycles with H 2 and O 2 . In samples prepared by adsorption, the maximum copper uptake corresponded to an extended plateau at 2.5 atoms nm -2 . In…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPatterned Growth of Well-Aligned Carbon Nanotubes: A Photolithographic ApproachYongyuan Yang, Shaoming Huang, Huizhu He, Albert W. H. Mau, and Liming DaiView Author Information CSIRO Molecular Science, Bag 10 Clayton South, Victoria 3169, Australia Cite this: J. Am. Ch…
In this paper we examine the effect of solvent on the optical extinction spectrum of periodic arrays of surface-confined silver nanoparticles fabricated by nanosphere lithography (NSL). By use of NSL, it is possible to systematically vary the out-of-plane height of the nanoparticles, and by thermal annealing, we can c…
A time temperature transformation (TTT)-diagram with respect to the formation of intermetallie phase in the range 700-1000°C has been assessed by point counting for a 29Cr-6Ni-2Mo-0.38N super duplex stainless steel. Using a computer program developed by the authors a continuous cooling transformation (CCT)-diagram was…
Stress corrosion cracking (SCC) susceptibility of nitrogen alloyed Type AISI 301 stainless steels in 50% CaCl 2 solution at 373 K (100°C) under open-circuit potential and cathodic polarisation conditions was studied using a constant load test method. The electrical properties of the surface films formed were monitored…
Superaustenitic stainless steels with about 6% molybdenum (Mo) have now been used successfully for over twenty years because of their high corrosion resistance. Requirements for even better performance have resulted in more highly alloyed superaustenitic steels, also with high nitrogen (N) levels. Substituting W for M…
While the recrystallisation mechanisms and texture development of cold rolled single phase materials especially those of ferritic steels, and to lesser extent, those of austenitic steels are well known and investigated [1,2], the recrystallisation in duplex and super duplex stainless steels was much less subject of re…
Starting from the electrostatic part of the intermolecular multipole interaction energy we derived irreducible spherical tensor formulas for the first-order long-range, interaction-induced first and second pair hyperpolarizabilities ΔβLM and ΔγLM for arbitrary shape monomers. For atoms a general relation is obtained f…