Micropore Size Distributions of Activated Carbons
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Materials Literature
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Homogenization of biaxial composite materials: dissipative anisotropic properties
Biaxial composite materials can be synthesized through the homogenization of constituent mediums with material properties less complex than biaxial, provided the constituents collectively present two distinguished axes. We investigate homogenization in the context of dissipative anisotropic dielectric and dissipative…
Electronic excitation inH+−C60collisions: Evaporation and ionization
We have studied energy transfer, fragmentation, and ionization in collisions between protons and ${\mathrm{C}}_{60}$ molecules. The collision energy is varied between 1 and 300 keV and we thus cover a velocity range from 0.2 to 3.5 atomic units. The distributions of intact and fragmented ${\mathrm{C}}_{60}$ ions have…
The Interaction of CF3CH2OH and (CF3CF2)2O with Amorphous Carbon Films
Fluorinated alcohols and fluorinated ethers adsorbed on carbon films have been studied in order to model the surface chemistry of Fomblin Zdol lubricants on the carbon-coated surfaces of magnetic data storage media. The model compounds used were 2,2,2-trifluoroethanol (CF 3 CH 2 OH), which is representative of the end…
Preparation of Silver−Latex Composites
Several in-situ chemical reduction methods were systematically evaluated in view of the formation of silver−latex composites, and in particular with respect to the task of coating colloidal latex spheres with uniform thin layers of silver. Such nanocomposite materials are of profound interest, due to their expected no…
Anomalous Larmour Frequency Dependence of Proton Spin-Lattice Relaxation Time (T$_1$) in the Ferroelectric Glycine Phosphite
We report here the results of $^1$H NMR spin-lattice relaxation time (T$_1$) studies in Glycine phosphite which is a ferroelectric below 224 K. The experiments have been carried out in the temperature range from 200 K to 419 K and at two Larmour frequencies of 11.40MHz and 23.56 MHz. We have noticed a Larmour frequenc…
Wetting layer thickness and early evolution of epitaxially strained thin films
We propose a physical model which explains the existence of finite thickness wetting layers in epitaxially strained films. The finite wetting layer is shown to be stable due to the variation of the non-linear elastic free energy with film thickness. We show that anisotropic surface tension gives rise to a metastable e…
Entanglements in a Quiescent and Sheared Polymer Melt
Molecular dynamics simulations were performed for a polymer melt. In quiescent states, the inter-chain interaction energy supported by each particle takes relatively large values persistently for long times if the particle is close to an entanglement. Thus, if the interaction is averaged over appropriate time interval…
Mechanisms of Deformation in Fully Conjugated Conducting Gels. Stretching and Swelling
Uniaxial elongation and swelling of well-defined fully conjugated poly(3-octylthiophene) gels of various functionalities and cross-link concentrations are studied above the melting temperature. The gels exhibit rubber elasticity (elastic modulus E in the range 0.2 < E < 0.7 MPa) and swell in chloroform. A linear relat…
N-Porphyrinylamino and -amido Compounds by Addition of an Amino or Amido Nitrogen to a Porphyrin Meso Position
This report describes the synthesis and characterization of a series of octaethylporphyrin derivatives in which the porphyrin pi-network is connected to phenyl, 3-fluoranthenyl, or 1-pyrenyl aromatic systems through a meso amino or amido nitrogen. Metal-free bases and zinc(II) and iron(III) complexes have been obtaine…
Mixed-Addenda Vanadium-Substituted Polyfluorooxometalates: Synthesis, Characterization, and Catalytic Aerobic Oxidation
For the first time, mixed-addenda vanadium-substituted polyfluorooxometalates, PFOMs, have been synthesized. Depending on the workup procedure used, two types of compounds were prepared. The first PFOM was a quasi Wells--Dawson type compound, [H2F6NaVVW17O56]8-, and the second a mixture of vanadium-substituted polyflu…
A Study of the Catalytic Dehydrochlorination of 2-Chloropropane in Oxidizing Conditions
The conversion of 2-chloropropane (2-CP) in the presence of oxygen has been investigated over a number of catalysts including alumina and alumina-supported copper chloride, manganese tungstate, mixed manganese−aluminum oxide, silica−alumina, and ZSM5 zeolite. Dehydrochlorination to propene + HCl is predominant, but ot…
Sequence Distribution and Fragmentation Studies of Bacterial Copolyester Macromolecules: Characterization of PHBV Macroinitiator by Electrospray Ion-Trap Multistage Mass Spectrometry
Sequence distribution and chemical structure of mass-selected macromolecules of poly(3-hydroxybutyrate- co -3-hydroxyvalerate), PHBV, biopolyester macroinitiator obtained by partial alkaline depolymerization of natural PHBV containing 5 mol % of HV units was determined by electrospray ionization multistage mass spectr…
NMR and EPR Investigations of Iron Corrolates: Iron(III) Corrolate π Cation Radicals or Iron(IV) Corrolates?
The chloroiron corrolates of 2,3,7,8,12,13,17,18-octamethyl- and 7,13-dimethyl-2,3,8,12,17,18-hexaethylcorrole ([(Me8C)FeCl] and [(7,13-Me2Et6C)FeCl], respectively) and their bisimidazole complexes have been investigated by NMR spectroscopy as a function of temperature, and by EPR spectroscopy at 4.2 K. Magnetic susce…
Kinetics of Individual Block Copolymer Island Formation and Disappearance near an Absorbing Boundary
We investigate the formation and coalescence of surface relief structures in symmetric diblock copolymers films of poly(styrene- b -2-vinylpyridine) (PS−PVP) on chemically patterned surfaces. The substrates have patterns of self-assembled monolayers (SAMs) produced by microcontact printing HO-terminated (HO−) SAM stri…
Segment Distribution of the Micellar Brushes of Poly(ethylene oxide) via Small-Angle Neutron Scattering
Coronal structures of the micelles spontaneously formed in water by poly(ethylene oxide)- b -polybutadiene (PEO−PB) were investigated using small-angle neutron scattering (SANS). Selective deuterium labeling of the hydrophobic PB block was employed to enhance the neutron scattering contrast between the PEO and PB segm…
Surface Stability in Liquid-Crystalline Block Copolymers with Semifluorinated Monodendron Side Groups
Block copolymers with semifluorinated monodendron side groups were synthesized by attachment of a first generation 2- or 3-armed monodendron acid chloride to a hydroxylated poly(styrene- b -1,2/3,4-isoprene). A convergent growth strategy was developed to synthesize the monodendron groups in good yield using an approac…
A Scattering-Mediated Acoustic Mismatch Model for the Prediction of Thermal Boundary Resistance
Solid-solid thermal boundary resistance Rb plays an important role in determining heat flow, both in cryogenic and room-temperature applications, such as very large scale integrated circuitry, superlattices, and superconductors. The acoustic mismatch model (AMM) and the related diffuse mismatch model (DMM) describe th…
A Statistical Kinetic Model for the Bulk Degradation of PLA-b-PEG-b-PLA Hydrogel Networks
A theoretical model has been developed to describe the bulk-degradation behavior of model PEG- b -PLA hydrogels. Utilizing a statistical approach to predict the cleavage of cross-links within these networks, the model accounts for both structural and kinetic issues during the degradation and, from direct comparison, c…
Prediction of solvent-diffusion coefficient in polymer by a modified free-volume theory
Several versions of free-volume theory have been proposed to correlate or predict the solvent diffusion coefficient of a polymer/solvent system. The quantity of free volume is usually determined by the Williams–Landel–Ferry (WLF) equation from viscosity data of the pure component in these theories. Free volume has bee…