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Theoretical foundations for the comparison of adsorption isotherms at the range of low surface coverages are presented in order to facilitate the use of this high-resolution comparative analysis for characterization of porous adsorbents. The well-known models of adsorption on heterogeneous and microporous solids were…
This paper addresses the worldwide research and development of HVDC cables with polymeric insulation. The unique features of the dc insulation characteristics of polyethylene are presented and discussed. The problems of using polymeric insulation in HVDC applications are presented and analyzed.
From a simple equation of motion for a linear chain, the phonon amplitudes for mobile and cage ions are represented in terms of their ionic radius and atomic mass. Estimated values of the amplitude in superionic conductors are larger for the mobile ions than the cage ions. Based on this result, many binary and ternary…
Detailed measurements of finite-amplitude pulses radiated by plane and focused circular pistons in water are presented. Comparisons of time waveforms and frequency spectra, both on and off axis, are made with numerical calculations based on the nonlinear parabolic wave equation. Emphasis is on nonlinear distortion of…
ZnS:Mn luminescent nanomaterials were first prepared in an inverse microemulsion at room temperature as well as under a hydrothermal condition. Mn-doped ZnS nanoparticles obtained are distributed from 3 to 18 nm in diameter as determined by transmission electron microscopy. The crystalline nature of the materials is c…
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Neutron reflectometry is used to study interdiffusion in bilayers of hydrogenated and deuterated poly(methyl methacrylate) (PMMA) on silicon substrates where the polymer−substrate interaction energy is strongly attractive. The effect of the polymer−substrate interaction energy on the interdiffusion rate as a function…
The embedded atom method (EAM) potentials for the Ni/Al/H system as previously published contain errors. The corrected potentials are presented here.
Confinement in nanostructures with (some of the) linear dimensions small compared to the exciton radius provides a possibility of enhancement of both the binding energy and the oscillator strength of excitons. Moreover in such structures the possibility arise of controlling the strength of Coulomb interaction, respons…
A series of dinuclear M(III) (M = Fe or Ga) catecholate complexes has been prepared using bisbidentate catecholate ligands ( L ). The products contain discrete, dinuclear M 2 ( L ) 3 6- anions featuring pseudo-octahedral coordination centers. The helical nature of the dinuclear complexes has been established by CD spe…
The use of in situ methods to study the synthesis of materials from sol−gel precursors is reviewed, with particular emphasis on the formation of crystalline phases from solid gel precursors and the crystallization of zeolitic materials from solution under hydrothermal conditions. A wide range of studies that have been…
We present a method for estimating the hopping rate for Zwanzig’s model of self-diffusion in liquids [R. Zwanzig, J. Chem. Phys. 79, 4507 (1983)]. To obtain this estimate, we introduce the cage correlation function which measures the rate of change of atomic surroundings, and associate the long-time decay of this func…
A subtilisin excreted by the Antarctic Bacillus TA39 has been purified to homogeneity and characterised. Two independent genes subt1 and subt2 are present but only subt1 is expressed significantly in the culture medium. The enzyme displays the usual characteristics of cold enzymes i.e. a high catalytic efficiency at l…
The properties of hydrogenated carbon films deposited from a highly ionized hydrocarbon plasma beam are studied as a function of deposition temperature. At low temperatures, the films have high sp3 bonding, density, and compressive stress and are very smooth. Two transition temperatures are observed, a lower transitio…
The dynamics of different molecular modes in four antiferroelectric liquid crystal substances have been studied by a combination of spectroscopic methods.The fastest motion is the reorientation around the molecular long axis, here found in the low GHz range by time domain spectroscopy. The reorientation around the sho…
A series of carbosilane dendrimer generations, G0 to G3, with 4, 12, 36, and 108 end groups, respectively, has been functionalized with perfluorohexyl (C 6 F 13 −) groups on the surface. Quantitative perfluoroalkylation of the dendrimer surface was achieved via free radical addition of 3,3,4,4,5,5,6,6,7,7,8,8,8-tridec…
We have studied the formation of platinum nanoparticles in an ethanol−water mixture with an ethanol volume fraction of 0.6 by ethanol reduction of PtCl 6 2 - in the presence of poly( N -isopropylacrylamide) (PNIPAAm−Pt) by UV−visible spectrophotometry. As predicted by calculation, a maximum at 215 nm in the absorption…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNoncovalent Synthesis of Layered and Channel Structures involving Sulfur-Mediated Hydrogen BondsV. R. Pedireddi, Swati Chatterjee, Anupama Ranganathan, and C. N. R. RaoView Author Information Chemistry & Physics of Materials Unit Jawaharlal Nehru Centre for Advanced Sc…
Cyclodextrins (CDs) were found to form inclusion complexes with aliphatic polyesters [−O(CH 2 ) x OCO(CH 2 ) 4 CO] n (where x = 2, 3, or 4) to give crystalline compounds. α- and γ-CD formed complexes with these polyesters in high yields, although β-CD gave complexes in moderate yields. Although the yields of the compl…
Bacterial Delta5-3-ketosteroid isomerase (KSI) catalyzes a stereospecific isomerization of steroid substrates at an extremely fast rate, overcoming a large disparity of pKa values between a catalytic residue and its target. The crystal structures of KSI from Pseudomonas putida and of the enzyme in complex with equilen…