Materials Literature
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The beta- and delta-subunits of the nicotinic acetylcholine receptor from Torpedo californica were covalently photolabeled at the synaptic surface with the ATP photoaffinity analogue [alpha-32P]-8-azido-ATP. The specificity of labeling for nucleotide binding sites was demonstrated by the saturation of labeling with in…
GaAs:C and AlxGa1−xAs:C films, grown by solid-source molecular-beam epitaxy with doping levels beyond 1019 cm−3, have been studied by high-resolution double-crystal x-ray diffraction, Hall-effect measurements, and secondary-ion-mass spectroscopy (SIMS). Comparison between x-ray diffraction and Hall-effect data indicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrientation-dependent interactions in polymer systems. 3. Segmental orientation in poly(2,6-dimethyl-1,4-phenylene oxide)/polystyrene miscible blendsKenji Kawabata, Takeshi Fukuda, Yoshinobu Tsujii, and Takeaki MiyamotoCite this: Macromolecules 1993, 26, 15, 3980–3985Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-liquid phase equilibria of mixtures of methyl myristate and methyl palmitateChristian A. Lockemann and Ernst Ulrich SchluenderCite this: J. Chem. Eng. Data 1993, 38, 3, 432–433Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published…
Abstract A series of side‐chain liquid crystalline polymers (side‐chain LCPs) with different flexible spacer lengths and various degrees of crosslinking were synthesized and characterized. The transport properties of O 2 , N 2 , CO 2 and CH 4 in these polymers were measured by using permeation and sorption methods. Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA low-temperature route to polyimidesJi Heung Kim and J. A. MooreCite this: Macromolecules 1993, 26, 14, 3510–3513Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993https://pubs.acs.org/doi/10.1021/ma00066a008https…
XPS spectra were acquired for highly ordered pyrolytic graphite, a single crystal diamond, and a C60 film. Carbon 1s and valence band spectra are included in the electronic record.
Abstract The residual birefringence distributions in polycarbonate disks quenched in a liquid bath under various conditions are determined. Unbalanced distributions of approximately parabolic shape are obtained in the cross‐sections in general. A systematic influence of the initial quench temperature on the imblance o…
The reaction of NH4F/HF solutions on Si (100) and Si (111) surfaces was investigated by means of x-ray photoelectron spectroscopy and high-resolution electron energy loss spectroscopy (HREELS). The pH of the HF treatment was varied in the range from pH 1 to pH 8. Exactly oriented Si (111) surfaces show an overall smoo…
Kerr measurements are reported for a cyclic trimeric liquid crystal above the uniaxial nematic-isotropic phase transition temperature ${\mathit{T}}_{\mathit{N}\mathit{I}}$. The inverse of the order-parameter susceptibility is found to be linear in temperature, such that the quantity ${\mathit{T}}_{\mathit{N}\mathit{I}…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSynthesis and investigation of the nonlinear optical properties of various p-aminophenyl sulfone oligomersMichael A. Mitchell, Masayuki Tomida, Anne Buyle Padias, H. K. Hall, Jr., Hilary S. Lackritz, Douglas R. Robello, Craig S. Willand, and David J. WilliamsCite this: Chem. Mat…
Abstract Analysis of products formed in the end‐capping step during the synthesis of two block copolyurethanes being studied as biomedical materials has shown the presence of dimeric soft segments and free diisocyanate. In this standard two‐step synthesis, the presence of these compounds lead to block copolyether‐uret…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of the sample preparation method of the ultra-small-angle x-ray scattering of lightly sulfonated polystyrenesB. P. Grady, H. Matsuoka, Y. Nakatani, S. L. Cooper, and N. IseCite this: Macromolecules 1993, 26, 15, 4064–4066Publication Date (Print):July 1, 1993Publica…
Eighteen soils from northwestern Switzerland were used to study the value of seven universal extractants (CaCl2; DB‐DTPA; Mehlich 1, 2, and 3; Morgan‐Wolf; and NH4OAc‐EDTA) for predicting plant available potassium (K) as compared to a bioassay (a modified Neubauer test with winter rye). These extractants were evaluate…
During a building corrosion control study, bottles containing acid‐preserved water samples with high levels of lead often had particulate material on the bottom. Scanning electron microscope analysis of the particles showed the presence of tin and the absence of lead, indicating the probable source of lead to be lead–…
Materials layered together for their electronic properties and chemical stabilities are typically subjected to residual stresses induced by thermal expansion mismatch, epitaxy, phase transition, or other mechanisms specific to deposition procedures. Interacting with preexisting defects, these stresses can cause brittl…
Passive films were formed on a high purity Fe‐23 Cr alloy in acid sulfate solutions in the presence and absence of chloride ion. The resulting film composition was investigated by Auger depth profiling. The passivated samples were exposed to a 1 M solution at a constant potential slightly above the critical pitting po…
Photocurrent measurements for stainless steel type 304 in the as‐received condition after dc and AV passivation have confirmed that significant changes of the passive film properties occur due to AV passivation. The photocurrents were the highest for the sample treated by the AV passivation process (AVPP). The bandgap…
Abstract Blends of poly(ethylene terephthalate‐Co‐p‐oxybenzoate), PET/PHB, with poly(ethylene terephthalate), PET, have been studied in the form of as‐spun and drawn fibers. DSC melting and crystallization results show that the PET is compatible with LCP and the crystallization of PET decreases by the addition of LCP…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-assembling nickel clusters form binding sites for alkali metal cations: novel analogs of enolate aggregatesOtto F. Schall, Kerry Robinson, Jerry L. Atwood, and George W. GokelCite this: J. Am. Chem. Soc. 1993, 115, 14, 5962–5969Publication Date (Print):July 1, 1993Publi…