Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
A commonly adopted model for the microstructure of Nephila clavipes major ampullate silk (MAS) is similar to that used for Bombyx mori (silkworm) silk: a simple composite wherein discrete, essentially perfect crystals are dispersed throughout an amorphous protein matrix. However, inconsistencies arise when researchers…
The calix[4]arene derivative 3 substituted at the wider rim by four urea residues was prepared in three steps from the corresponding tert -butyl calix[4]arene 2a . Due to the different ether residues attached to the narrow rim its constitution is C 2 v -symmetrical, and the hydrogen bonded dimers 3 · 3 formed in benze…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTChirality-Memory Molecule: A D2-Symmetric Fully Substituted Porphyrin as a Conceptually New Chirality SensorYoshio Furusho, Takayuki Kimura, Yukitami Mizuno, and Takuzo AidaView Author Information Department of Chemistry and Biotechnology Graduate School of Engineering…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMultisite Inclusion Complexation of Redox Active Dendrimer GuestsRené CastroRené CastroChemistry Department, University of Miami Coral Gables, Florida 33124-0431 Departamento de Química Inorgánica, Facultad de Ciencias, Universidad Autónoma de Madrid Cantoblanco, 28049…
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…