Materials Literature
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Abstract Stabilization of Horseradish Peroxidase (HRP; EC 1.11.1.7) against temperature and pH via the formation of the conjugates obtained by multipoint covalent bonding of dextran aldehyde (DA) to the enzyme were studied. Hence, three different molar weighted dextrans (17.5 kD, 75 kD, 188 kD) were covalently bonded…
The present work investigates single CdSe QD blinking behaviour in the absence of illumination, in order to elucidate the role of photoexcitation on the long time dynamics. The probability of a QD transitioning in the dark from a high quantum yield (‘on’) state to a low quantum yield (‘off’) state is found to be extre…
Shear viscosity of n-decane was computed using the molecular stress transient time correlation function (TTCF) formalism for the wide range of shear rates from 1.7 × 1010 s−1 to 2.13 × 104 s−1. In earlier work calculations were presented for the shear viscosity of n-decane using the atomic stress formalism of the TTCF…
In this report, we summarise highlights of a workshop sponsored by the Centre Européen de Calcul Atomique et Moléculaire on the dissipative particle dynamics method (DPD) held during 16–18 July 2008, at the Ecole Polytechnique Federale de Lausanne (EPFL), Switzerland. We present our motivation for organising the works…
We report on the capillary flow behaviour of thermotropic liquid crystal mixtures containing 4-n-octyl-4′-cyanobiphenyl (8CB) and 4-n-pentyl-4′-cyanobiphenyl (5CB). The liquid crystal mixtures are studied in the Nematic (N) and Smectic (SA) phases at room temperature. Polarised optical microscopy (POM), rheology and s…
Composites of polyaniline with synthesized nanostructured titania ( TiO 2 ) and polyaniline with commercial TiO 2 have been in situ synthesized by oxidative chemical polymerization method. Sulfuric acid was used as dopant during the polymerization process. Sol-gel precipitates of nanostructured titania were synthesize…
Wicking is the spontaneous flow of a liquid in a porous substrate, driven by capillary force. This flow in aporous medium, caused by capillary action, is governed by the properties of the liquid such as surface tension, viscosity and density as well as the surface-wetting forces and geometric configuration of the pore…
Phosphonitrillic chroride cyclic trimer 화합물을 <TEX>$200{\sim}300\;{^{\circ}C}$</TEX> 하에 개환중합하여 선상 고분자를 얻 은 후 Grignard 시약 (<TEX>$CH_2$</TEX>=CH-MgBr)을 천천히 가하여 vinyl 기를 포함하는 polyphosphazene을 합성하였 으며, 이 폴리머를 HEMA(2-hydroxyethyl methacrylate)와 반응시켜 HEMA/vinyl-substituted polyphosphazene 을 얻었다. 이 고분자를 AIBN (azobisisobutyron…
The correlation between the sintering temperature and dielectric properties in the <TEX>$Nb^{5+}\;and\;Ta^{5+}$</TEX> doped BaTi<TEX>$O_3$</TEX> solid solutions have been investigated. The samples were sintered at temperatures ranging from 1250 to 1350 <TEX>${^{\circ}C}$</TEX> for 4 h in air. SEM, XRD and SEM/EDS tech…
An estimation technique of the local heat transfer coefficient, based on the solution of the 2-D inverse heat conduction problem, has been adopted in order to investigate the effect of the surface wettability on the two-phase convective heat transfer in a dehumidifying process. The convective heat transfer coefficient…
The synthesis of new mononuclear and binuclear copper complexes derived from Schiff bases, namely N(4-n-alkyloxysalicylidene)-4′-n-alkylanilines is carried out and their structure and liquid crystalline properties have been investigated. The ligands exhibit rich polymesomorphism; mononuclear complexes exhibit smectic…
In order to understand the mesophase behaviour of the p-phenylene pentamer p-quinquephenylene (PPPPP), all symmetric pentamers composed of p-phenylene (P) and 2,5-thiophene (T) have been synthesised and investigated. The effects of substituting 1,4-phenylene by 2,5-thiophene units are the introduction of kinks along t…
Interstitial clusters are known to cause frequent one-dimensional (1D) jumps (stepwise positional changes) under electron irradiation around room temperature. The distance of 1D jumps in iron was examined in detail through in-situ observation using high-voltage electron microscopy. The 1D jump distance was found to be…
The Bauschinger effect in dispersion-strengthened materials is investigated with the help of a 3D dislocation dynamics simulation. Among the different elementary features controlling strengthening, Orowan loops around impenetrable particles appear to be a key parameter of non-relaxed microstructures, as they effective…
Three novel bent-shaped monomers, namely 1,3-phenylene bis-{4-[4-(n-allyloxyalkyloxy)phenylazo]benzoate} 5a–c, containing azobenzene as side arms, resorcinol as central units and terminal double bonds as polymerisable functional groups were synthesised and characterised. The mesophase behaviour was investigated by pol…
The hierarchical self-assembly of disc-shaped molecules leads to the formation of discotic liquid crystals. These intriguing materials are of fundamental importance not only as models for the study of energy and charge migration in self-organised systems, but also as functional materials for various device application…
A series of Yb-filled skutterudites were produced and powder samples consolidated using spark plasma sintering (SPS). The effect of different heating cycles on the resulting transport properties of the consolidated samples was explored. Specifically, the effect of sample uniformity on the electrical and thermal transp…
Single crystals of fully dehydrated and fully <TEX>$Ca^{2+}$</TEX>-exchanged zeolites A (|<TEX>$Ca_6$</TEX>|[<TEX>$Si_{12}Al_{12}O_{48}$</TEX>]-LTA) and X (|<TEX>$Ca_{46}$</TEX>| [<TEX>$Si_{100}Al_{92}O_{384}$</TEX>]-FAU) were brought into contact with Te in fine pyrex capillaries at 623 K and 673 K, respectively, for…
There is an increasing amount of literature concerning electronic properties of graphene close to the neutrality point. Many experiments continue using the two-probe geometry or invasive contacts or do not control samples' macroscopic homogeneity. We believe that it is helpful to point out some problems related to suc…
Bulk specimens of the hetaerolite solid solution Zn$_x$Mn$_{3-x}$O$_4$, with $x$ = 0, 0.25, 0.5, 0.75, and 1 have been prepared as homogeneous, phase-pure polycrystalline samples as ascertained by neutron diffraction measurements. Samples with $x$ = 0.25, 0.5, and 0.75 exhibit shifted magnetic hysteresis loops at low…