Materials Literature
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The electrical properties of Pt/Ga 2 O 3 /SiC metal oxide semiconductor devices are presented in this paper in order to determine the hydrogen sensing mechanism. This was achieved by studying the role of the interface states upon the introduction of hydrogen/hydrocarbon gas. Current–voltage ( I – V ), conductance–volt…
We investigated the effect of charge-charge interactions on the mobilities of rhodamine 6G (R6G), Nile Red, sulforhodamine B, and Oregon Green 514 (ORG) guest molecules within a silica sol-gel host as the guest charge progressed from positive to neutral to negative. Through classification of the mobility as fixed, tum…
This paper describes the ring-opening polymerization of 2,4,6,8-tetramethylcyclotetrasiloxane (D 4 H ) in miniemulsion, using mono- and diphosphonic acid surfactants. In the simplest formulation conditions, polymerization proceeds in less than 15 min to generate linear poly(methylhydrogenosiloxane) (PMHS) of large mol…
By use of the static analytical method, the solubilities of terephthalic acid in binary dimethyl sulfoxide (2) + water and in binary N,N -dimethylformamide (2) + water solvent mixtures were determined in the temperature range from (301.4 to 373.7) K and solvent composition range from ( w 2 = 0.8 to 1.0). The solubilit…
Microfluidic networks is a powerful tool for aligning one-dimensional materials over a large area on solid substrates. Here we show that lipid nano- and microtubules can be assembled into two-dimensional (2-D) parallel arrays with controlled separations by combining fluidic alignment with dewetting, which occurs withi…
The electro-optic (EO) properties of a new lead-free ceramic based on a (1− x )K 0.5 Na 0.5 NbO 3 – x SrTiO 3 solid solution with x = 0.2 have been investigated. This material has a pseudo-cubic perovskite structure and typical relaxor-like properties for x ∼0.15–0.25 (see Kosec M et al 2004 J. Mater. Res. 19 1849–54…
In this paper, we study wetting and dewetting of hydrated biopolymer layers mediating cell–cell and cell–tissue contacts, called the extracellular matrix and cell surface glycocalix, by the combination of various physical techniques. Here, the sum of the net effects of the various interfacial forces, which is referred…
We report the single-crystal structure of an inorganic gallium cluster [Ga13(mu3-OH)6(mu2-OH)18(H2O)24](NO3)15.6H2O prepared using a simple organic reaction to drive the formation of the crystalline inorganic cluster.
Several azacrown ether derivatives, which are monoaza-12-crown-4, -15-crown-5, and -18-crown-6 and diaza-12-crown-4 and -18-crown-6, bearing one or two spirobenzopyran(s), which we call crowned spirobenzopyran or crowned bis(spirobenzopyran), were synthesized and were used as carriers for liquid membrane transport of…
We describe recent investigations on the impact behaviour of liquid drops onto chemically structured surfaces. The surface patterns were prepared via photochemical attachment of polymer molecules with different hydrophilicities using self-assembled monolayers of benzophenone bearing silanes. Immobilization of the poly…
We report on efforts to mimic the wetting behaviour of surfaces or leaves of certain plants, which are rendered ultrahydrophobic through a dense layer of hairs grown on top of the leaf. We use a simple moulding approach to obtain elastic hydrophilic hydrogel networks with pillar structures that may serve as model syst…
We have used several techniques, including Stark spectroscopy and MO calculations, to investigate the optical and electronic properties of two new dipolar chromophoric cations containing diquat-based electron acceptor groups. Both the Stark data and the calculated parameters show that the strong electron-accepting pro…
Reported herein is a combination of experimental and DFT/TDDFT theoretical investigations of the ground and excited states of 1,4,8,11,15,18,22,25-Octabutoxyphthalocyaninato-nickel(II), NiPc(BuO)(8), and the dynamics of its deactivation after excitation into the S(1)(pi,pi) state in toluene solution. According to X-ra…
Both monolayer and thick (20 microm) films of dry pGEM-3Zf(-) plasmid DNA deposited on tantalum foil were exposed to Al Kalpha X-rays (1.5 keV) for various times in an ultrahigh vacuum chamber. For monolayer DNA, the damage was induced mainly by low energy secondary electrons (SEs) emitted from the tantalum. For the t…
Resonant Raman spectroscopy and transmission electron microscopy were used to characterize the structural changes of three single-walled carbon nanotube samples processed with purification, pelletization, and surfactant-assisted dispersion. A two-stage purification process selectively removes metallic tubes as well as…
[reaction: see text] The synthesis of liquid crystal series 9a-d was achieved using the Buchwald protocol and Sonogashira reaction.
Liquid droplets, gas bubbles, and membrane vesicles which are in contact with chemically structured substrate surfaces can undergo morphological transitions or shape transformations. The structured surfaces considered here consist of two types of surface domains, γ and δ, which attract and repel the droplets, bubbles,…
A 'particle interaction apparatus' based on the technique of atomic force microscopy was constructed that allows us to measure the interaction between single micron-sized particles and the air–water interface. From the force versus distance profiles ('force curves') the contact angle of single microspheres could be de…
The formation of foams of biodegradable poly(ε-caprolactone) (PCL) from CO 2 solutions in molten PCL was investigated. This study included characterization of the CO 2 diffusion and equilibrium solubility in molten PCL in contact with supercritical CO 2 (scCO 2 ). Experiments were performed at 70, 80, and 90 °C at CO…
This study presents an evaluation of the catalytic performances of CuY-5 in wet hydrogen peroxide oxidation of phenol. The catalyst was prepared by ionic exchange from the protonic form of the commercial HY-5 zeolite. The process was carried out within the temperature range from 323 to 353 K and at atmospheric total p…