Materials Literature
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The stability of the diblock copolymer ordered phases is investigated by means of a novel theory of anisotropic composition fluctuations. The analogy between a polymer chain in a periodic structure and an electron in a crystalline solid is exploited in the development of the theory. This theory allows the calculation…
Low-temperature CO adsorption on TiO 2 (anatase) has been investigated by FTIR spectroscopy on (i) a pure sample, (ii) a sample on which the sites for CO adsorption at room temperature are blocked by ammonia, and (iii) anatase whose surface is covered by ammonia. Adsorption of small amounts of CO at 100 K on anatase l…
The photophysical and photochemical properties of a series of spiro[2 H -1-benzopyran-2,2‘-indoline] compounds (Sp- n ) five of them containing a nitro group in the 6-position of the benzopyran portion ( n = 1 − 5 ) while two ( n = 6, 7 ) do not were studied by nanosecond laser photolysis in solution. An intermediate,…
The structure of a series of poly(amidoamine) dendrimers Gn(C12) generated from a diaminododecane core have been investigated using the photophysical properties of an external dye, nile red. The modified dendrimers Gn(C12) show the ability to host the hydrophobic dye, nile red, in aqueous solution. The ability of Gn(C…
Chitin and chitosan are natural polymers extracted from various plants and animals. In recent years, these two polymers have attracted much interest because of their biodegradability, biocompatibility, wound-healing acceleration and many other unique properties. As a natural renewable resource, they offer many potenti…
In aqueous solution (2 < pH < 8) the thermodynamically stable form of the 4‘-methoxyflavylium ion ( AH + ) is its hydrated derivative trans -4‘-methoxychalcone, C t . The C t compound shows a broad absorption band with λ max = 350 nm. In acid medium, irradiation of C t with near-UV light causes strong spectral changes…
Fabrication of metal oxide thin films with thickness control of nanometer precision is an important technology that leads to wide practical applications. The present study demonstrates that a surface sol−gel process, composed of chemisorption of alkoxide, rinsing, hydrolysis, and drying, is a superior technique for th…
Within the mode-coupling theory (MCT) for the dynamics of simple liquids, the leading corrections to the asymptotic solutions for the relaxation in the vicinity of an ideal glass transition are derived. The formulas are used to determine the range of validity of the scaling-law description of the MCT results for the \…
The effect of temperature on adsorption isotherms of Ar, N 2, O 2, C 2 H 4, and CO 2 on mesoporous MCM-41 molecular sieves with different pore sizes (pore radius r p = 1.2, 1.4, 1.8, 2.1 nm) has been measured. The occurrence of adsorption hysteresis upon capillary condensation of these molecules in mesopores depends o…
Smart materials such as piezoceramics, magnetostrictive materials, and shape memory alloys exhibit hysteresis, and the larger the input signal the larger the effect. Hysteresis can lead to unwanted harmonics, inaccuracy in open loop control, and instability in closed loop control. The Preisach independent domain hyste…
We reexamine the stability of hexagonally modulated layer (HML) and hexagonally perforated layer (HPL) morphologies in a number of block copolymer systems of low to moderate molecular weight. Using small-angle X-ray scattering and dynamic mechanical spectroscopy, we show that these structures are long-lived nonequilib…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPhotosensitized Near Infrared Luminescence of Ytterbium(III) in Proteins and Complexes Occurs via an Internal Redox ProcessWilliam D. Horrocks,, James P. Bolender, Wendy D. Smith, and Ronald M. SupkowskiView Author Information Department of Chemistry The Pennsylvania S…
Four different strategies of surface coating (based on 80 g m2 melamin impregnated papers) were used on 19 mm thick commercial MDF panels to assess its reological behaviour under cyclic humidity conditions (20ºC 30 % rh-20ºC 90 % rh). Three different levels of stress (20 %, 30 % and 40 %), based on the ultimate load i…
The possibility of recycling construction rubble, its technical and economic effectiveness, and the social and ecological impact they provide for our society is the reason and the starting point for an optimal exploitation of this aggregate in the manufacture of masonry mortar, since it has the same inherent propertie…