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Evaluation Of Plasma Polymers Of Silanes As Adhesion Promoters For Organic Paint, Y. Matsuda, H. Yasuda
Evaluation Of Plasma Polymers Of Silanes As Adhesion Promoters For Organic Paint, Y. Matsuda, H. Yasuda
Chemistry Faculty Research & Creative Works
Plasma-polymerized coatings were prepared in a bell-jar-type reactor equipped with a magnetron system behind parallel aluminum electrodes using an a.c. source of frequency 10 kHz. Tetramethoxysilane, dimethyldimethoxysilane and hexamethyldisilane were used as monomers. Alkyd paint was coated on titanium plates onto which plasma polymer films had been deposited, to investigate the characteristics of the plasma-deposited films as adhesion promoters. The relationship between the adhesion strength for the paint and the conditions for the plasma polymerization was studied. The properties of the plasma polymers are dependent on the conditions of plasma polymerization manifested by two domains, namely the energy-deficient and the …
Preparation Of Gas Separation Membranes By Plasma Polymerization With Fluoro Compounds, H. Nomura, P. W. Kramer, H. Yasuda
Preparation Of Gas Separation Membranes By Plasma Polymerization With Fluoro Compounds, H. Nomura, P. W. Kramer, H. Yasuda
Chemistry Faculty Research & Creative Works
Plasma polymerization coatings were applied for the preparation of gas separation membranes. Mainly fluoro compounds were used as coating materials. The membranes showed good separation characteristics with high flux for gaseous systems. The plasma polymerization composite parameter given by W/FM plays an important role in obtaining excellent separation characteristics. The correlation between the conversion rate DR/FM, where DR is the deposition rate of plasma polymer, and W/FM is useful to consider the plasma polymer character under the different plasma polymerization conditions (discharge power W and monomer flow rate F). The proper conditions for membrane preparation lie in the intermediate region …
Magnetic Phase Diagram And Spin Glass Behavior Of Fe₁₋ₓmnₓcl₂·2h₂O, Gary C. Defotis, Christoph Pohl, Spencer A. Pugh, Ekkehard Sinn
Magnetic Phase Diagram And Spin Glass Behavior Of Fe₁₋ₓmnₓcl₂·2h₂O, Gary C. Defotis, Christoph Pohl, Spencer A. Pugh, Ekkehard Sinn
Chemistry Faculty Research & Creative Works
The magnetic phase diagram of Fe1-xMnxCl2·2H2O has been determined. A tetracritical point appears to be present at x ≊ 0.74 and T≊2.8 K. The upper paramagnetic-antiferromagnetic phase boundaries exhibit an unusually rapid descent, and the mixed ordered region below the tetracritical point is quite small. Moreover, regions exhibiting spin glass character also occur in the diagram. The unusually complex behavior is presumably due to the unique constitution of this system: A mixture of two antiferromagnets with different periodicities, competing orthogonal spin anisotropics, competing ferromagnetic and antiferromagnetic near neighbor intrachain exchange interactions, and …
Preparation And Characterization Of Composite Hollow Fiber Reverse Osmosis Membranes By Plasma Polymerization. 2. Reproducibility Of The Plasma Polymerization Process And Durability Of The Resulting Coated Membrane, Y. Matsuzawa, H. Yasuda
Preparation And Characterization Of Composite Hollow Fiber Reverse Osmosis Membranes By Plasma Polymerization. 2. Reproducibility Of The Plasma Polymerization Process And Durability Of The Resulting Coated Membrane, Y. Matsuzawa, H. Yasuda
Chemistry Faculty Research & Creative Works
The reproducibility of the plasma polymerization process was examined in a semicontinuous coating of hollow fibers, 6 fibers in lengths of approximately 12-15 m, by evaluating the performance of reverse osmosis membranes. The uniformity of the coating along the length of hollow fibers, as well as the reproducibility of the process, was found to be satisfactory when electrodes were conditioned in the actual conditions of plasma polymerization to be employed and plasma polymerization conditions were carefully controlled. The durability of the coated hollow fibers was then investigated in the following test media: hot water, low pH, high pH, and 0.1% …
Preparation And Characterization Of Composite Hollow Fiber Reverse Osmosis Membranes By Plasma Polymerization. 1. Design Of Plasma Reactor And Operational Parameters, P. J. Heffernan, K. Yanaglhara, Y. Matsuzawa, E. E. Hennecke, E. W. Hellmuth, H. Yasuda
Preparation And Characterization Of Composite Hollow Fiber Reverse Osmosis Membranes By Plasma Polymerization. 1. Design Of Plasma Reactor And Operational Parameters, P. J. Heffernan, K. Yanaglhara, Y. Matsuzawa, E. E. Hennecke, E. W. Hellmuth, H. Yasuda
Chemistry Faculty Research & Creative Works
Composite hollow fiber reverse osmosis membranes were prepared by depositing a thin layer (10-50 nm) of plasma polymers on hollow fibers with porous walls (made of polysulfone). The coating was carried out in a semicontinuous manner with six strands of substrate fibers. Operational parameters which influence reverse osmosis characteristics of composite membranes were investigated. © 1984, American Chemical Society. All rights reserved.
Aphasia After Left Thalamic Infarction, Philip B. Gorelick, Daniel B. Hier, Louis Benevento, Susan Levitt, Walter Tan
Aphasia After Left Thalamic Infarction, Philip B. Gorelick, Daniel B. Hier, Louis Benevento, Susan Levitt, Walter Tan
Chemistry Faculty Research & Creative Works
We Examined a 70-Year-Old Woman Who Became Aphasic after a Left Thalamic Infarction. Computed Tomographic Scan Showed Injury that Was Largely Limited to the Ventral Anterior and Rostral Ventral Lateral Thalamic Nuclei. Speech Was Characterized by Reduced Voice Volume, Impaired Auditory and Reading Comprehension, Perseverations, Intermittent Use of Jargon, Fluctuations in the Ability to Perform Confrontation Naming, Extraneous Intrusions, Verbal Paraphasia, Intact Repetition Skills, and Fluent Speech that Was Laconic But Grammatically Correct. We Propose that the Deficits after Left Thalamic Injury Can Be Grouped into the Following Four Large Clusters: Extrapyramidal Deficits (Decreased or Fading Voice Volume), Deficits in …
Molecular Motion And Phases In An Equimolar Phosphatidylcholine/Ethylene Glycol System, David W. Larsen, Shankar B. Rananavare, Frank E. Stary, Magda Elnokaly, Stig Friberg
Molecular Motion And Phases In An Equimolar Phosphatidylcholine/Ethylene Glycol System, David W. Larsen, Shankar B. Rananavare, Frank E. Stary, Magda Elnokaly, Stig Friberg
Chemistry Faculty Research & Creative Works
An equimolar mixture of phosphatidylcholine and ethylene glycol was studied by pulsed proton NMR at temperatures between 100 and 430 K. Relaxation times T1, T1ρ, and T1D, and second moments, M2, were measured. The system is lamellar liquid crystalline at room temperature, but at least four phases are present within the temperature range studied. Phase transitions were confirmed by DSC. Activation barriers were estimated for methyl reorientation, choline group motion, and chain motion. Models to describe the various motions and the role of spin diffusion are discussed. The relationship of the parameters for the present system to those for the …
Solubilization Of Calcium Dodecyl Sulfate In A Micellar Solution And In Lamellar Liquid Crystal, Stig Friberg, David W. Osborne
Solubilization Of Calcium Dodecyl Sulfate In A Micellar Solution And In Lamellar Liquid Crystal, Stig Friberg, David W. Osborne
Chemistry Faculty Research & Creative Works
Calcium dodecyl sulfate (CDS) was solubilized in the aqueous micellar solution of sodium dodecyl sulfate and in the lamellar liquid crystal obtained from water, sodium dodecyl sulfate and decanal. The solubilization of CDS in the micellar solution was strongly increased with the concentration of sodium dodecyl sulfate while the maximum amount of CDS solubilized in the liquid crystal remained similar. The solubilization in the micellar solution was gradually increased with the alcohol content with a sudden reduction to zero at the decanol/sodium-dodecyl-sulfate ratio marking the end of the micellar region with no calcium soap being present. The dependence of the …
Lyotropic Liquid Crystals From Lecithin, Water, And Polyethylene Glycol, Magda El Nokaly, Stig Friberg, David W. Larsen
Lyotropic Liquid Crystals From Lecithin, Water, And Polyethylene Glycol, Magda El Nokaly, Stig Friberg, David W. Larsen
Chemistry Faculty Research & Creative Works
Lyotropic liquid crystals with lecithin as the amphiphile and with water/polyethylene glycol (PEG) solutions as the solvent were prepared with polyethylene glycol/water ratios from 182 to 0. The liquid crystals were lamellar and the interlayer spacing was independent of the solvent content for water/PEG ratios ≤1 but increased strongly with the water/PEG ratio. Higher ratios gave increased interlayer spacing with solvent content similar to the variation for liquid crystals with water as solvent but the absolute values of the spacing were higher. © 1984 Academic Press, Inc. All rights reserved.
A Lamellar Liquid Crystal As An In Situ Surface Balance. I. The Conformation Of 5- (And 6-)Carboxy-4-Hexyl-2-Cyclohexene-1-Yl Octanoic Acid And Its Monosoap, Tony Flaim, Stig Friberg
A Lamellar Liquid Crystal As An In Situ Surface Balance. I. The Conformation Of 5- (And 6-)Carboxy-4-Hexyl-2-Cyclohexene-1-Yl Octanoic Acid And Its Monosoap, Tony Flaim, Stig Friberg
Chemistry Faculty Research & Creative Works
The interfacial conformation of a dicarboxylic acid, 5- (and 6-)carboxy-4-hexyl-2-cyclohexene-1-yl octanoic acid, and its monosodium soap was determined from the change of liquid crystal dimensions after introduction of the diacid compounds. The results showed that both functional groups of the Mono soap form were present at the interface and that increased water content of the liquid crystal matrix had little effect on the conformation of the Mono soap. On the other hand, the results indicated the conformation of the diacid as such to depend on the water content of the matrix. At low water content, the diacid form was in …
Alignment Of A Nonaqueous Lyotropic Liquid Crystalline Phase With Lecithin, David W. Larsen, Shankar B. Rananavare, Stig Friberg
Alignment Of A Nonaqueous Lyotropic Liquid Crystalline Phase With Lecithin, David W. Larsen, Shankar B. Rananavare, Stig Friberg
Chemistry Faculty Research & Creative Works
No abstract provided.
Single Compound Forming A Lyotropic Liquid Crystal At Room Temperature, Stig Friberg, Paul Liang, Frances E. Lockwood, Maher Tadros
Single Compound Forming A Lyotropic Liquid Crystal At Room Temperature, Stig Friberg, Paul Liang, Frances E. Lockwood, Maher Tadros
Chemistry Faculty Research & Creative Works
The compound triethanolammonium oleate forms a lamellar liquid crystal at room temperature. The basis for the lyotropic mesomorphism is the fact that part of the triethanolammonium oleate has changed to triethanolamine and oleic acid. These two compounds serve as solvents in the liquid crystalline structure. © 1984 American Chemical Society.
Magnetic And Crystallographic Structure Of Y₆Mn₂₃D₂₃, K. A. Hardman-Rhyne, James J. Rhyne, E. Prince, Cyrus E. Crowder, William Joseph James
Magnetic And Crystallographic Structure Of Y₆Mn₂₃D₂₃, K. A. Hardman-Rhyne, James J. Rhyne, E. Prince, Cyrus E. Crowder, William Joseph James
Chemistry Faculty Research & Creative Works
The magnetic behavior of Y6Mn23 is dramatically altered upon hydrogenation (or deuteration). In this study it has been found, by means of high-resolution powder diffraction and Rietveld refinement techniques, that the crystallographic structure is distorted from face-centered cubic (Fm3m) at 295 K to a primitive tetragonal structure at 4 K in which deuterium atoms are atomically ordered. Y6Mn23 is a ferromagnetic compound with Tc=486 K, and bulk magnetization of 13.2 Bf.u. (formula unit). After deuteration of Y6Mn23 to the composition Y6Mn23D23, low-temperature scattering data (T<180 K) show that the b and f2 sites in the Fm3m structure are antiferromagnetic and the d and f1 sites have no spontaneous magnetic moment. © 1984 The American Physical Society.
Order Parameters Of Hydrocarbons Solubilized In A Lamellar Liquid Crystal, Anthony J.I. Ward, Stig Friberg, David W. Larsen, Shankar B. Rananavare
Order Parameters Of Hydrocarbons Solubilized In A Lamellar Liquid Crystal, Anthony J.I. Ward, Stig Friberg, David W. Larsen, Shankar B. Rananavare
Chemistry Faculty Research & Creative Works
A preliminary study of the 2H NMR spectrum of n-hexadecane-d34 solubilized in the lamellar phase of tetra ethylene glycol n-dodecyl ether has been made as a function of solubilization content. Complex spectra comprising eight overlapping powder spectra were observed, which showed a complex oil concentration dependence. These spectra were unusually rich in detail and indicate a considerably higher degree of complexity than has earlier been reported for solubilized hydrocarbons. The derived order profile was found to be different from that normally found for amphiphiles in lamellar environments. A tentative model involving some penetration of solubilize molecules between the host amphiphiles …
Composition Of Regenerated Cell Walls Of Reverting Aureobasidium Pullulans Protoplasts, D. R. Quigley, Donald J. Siehr
Composition Of Regenerated Cell Walls Of Reverting Aureobasidium Pullulans Protoplasts, D. R. Quigley, Donald J. Siehr
Chemistry Faculty Research & Creative Works
Protoplasts of Aureobasidium pullulans, formed by treating normal blastospores with polysaccharide-hydrolizing enzymes, synthesized glycans when incubated in shallow culture. The polysaccharides formed a loose, thick coating on the cells. The glycans that were formed are similar to the glycans in normal cell walls; however, they lack the branching that is normally found. This result is consistent with the findings of others who have studied the cell wall composition of reverting yeast protoplasts.