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Articles 1 - 30 of 49
Full-Text Articles in Engineering
Structural Characterization Of Aluminum Films Deposited On Sputtered-Titanium Nitride/ Silicon Substrate By Metalorganic Chemical Vapor Deposition From Dimethylethylamine Alane, Xiaodong Li, Byoung-Youp Kim, Shi-Woo Rhee
Structural Characterization Of Aluminum Films Deposited On Sputtered-Titanium Nitride/ Silicon Substrate By Metalorganic Chemical Vapor Deposition From Dimethylethylamine Alane, Xiaodong Li, Byoung-Youp Kim, Shi-Woo Rhee
Faculty Publications
Alfilmsdeposited on sputtered‐TiN/Si substrate by metalorganic chemical vapor deposition(MOCVD) from dimethylethylamine alane (DMEAA) were characterized using x‐ray diffraction(XRD),Auger electron spectroscopy(AES),atomic force microscopy(AFM), and transmission electron microscopy (TEM). The TiN filmsputtered on the Si has a preferred orientation along the growth direction with the 〈111〉 of the film parallel to the Si〈111〉. Sputtering of the TiN film on the Si induced strains at the interface. The TiN/Si interface is flat while the Al/TiN interface is rough. There exist many dislocations at the Al/TiN interface. The Al2O3 phase was formed at the Al/TiN interface during the early stages of …
Croatian Symposium Of Chemistry And Macromolecular Chemistry, Otto Vogl, Zvonimir Janovic
Croatian Symposium Of Chemistry And Macromolecular Chemistry, Otto Vogl, Zvonimir Janovic
Emeritus Faculty Author Gallery
No abstract provided.
Polymer Science In Australia Iv. Universities In Victoria And Southern Australia, Otto Vogl, David Solomon, Ezio Rizzardo, Robert A. Shanks, David Williams
Polymer Science In Australia Iv. Universities In Victoria And Southern Australia, Otto Vogl, David Solomon, Ezio Rizzardo, Robert A. Shanks, David Williams
Emeritus Faculty Author Gallery
No abstract provided.
52. Bengt Ranby, Otto Vogl
53. Takeo Saegusa, Otto Vogl
Equilibrium Phase-Behavior Of Nematic Mixtures, Hao-Wen Chiu, Thein Kyu
Equilibrium Phase-Behavior Of Nematic Mixtures, Hao-Wen Chiu, Thein Kyu
College of Polymer Science and Polymer Engineering
A phenomenological model for predicting phase diagrams of a binary nematic mixture containing side chain liquid crystalline polymers and/or low molar mass liquid crystals has been proposed by combining Flory-Huggins free energy of isotropic mixing and Maier-Saupe free energy for nematic ordering of the nematogens. Two orientational order parameters, s(1) and S-2, Of the two components in the mixtures having two different clearing temperatures are taken into consideration in the calculation. The Flory-Huggins interaction parameter, chi, and the nematic interaction parameter of the Maier-Saupe theory, nu(1) and nu(22), are assumed to be functions of inverse absolute temperature. Further the cross-nematic …
Size-Dependent Adsorption Models In Microporous Materials. 2. Comparison With Experimental Data, Manuela Giustiniani, Massimiliano Giona, Douglas K. Ludlow
Size-Dependent Adsorption Models In Microporous Materials. 2. Comparison With Experimental Data, Manuela Giustiniani, Massimiliano Giona, Douglas K. Ludlow
Chemical and Biochemical Engineering Faculty Research & Creative Works
In This Article, We Complete the Study of Size-Scaling Effects and of the Keller Model, presenting a Detailed Analysis of the Application of This Model to a Broad Range of Experimental Data on Microporous Materials (In Particular, Activated Carbon and Zeolites). Particular Attention is Focused on the Temperature Dependence of the Freundlich Exponents Αi, on the Functional Form of the Adsorption Energies, and on the Application of Keller Adsorption Isotherms in a Predictive Way to Generic Multicomponent Mixtures. © 1995, American Chemical Society. All Rights Reserved.
Diffusion In Inhomogeneous Polymer Membranes, Sameer Suresh Kasargod, Farhad Adib, Partho Neogi
Diffusion In Inhomogeneous Polymer Membranes, Sameer Suresh Kasargod, Farhad Adib, Partho Neogi
Chemical and Biochemical Engineering Faculty Research & Creative Works
The dual mode sorption solubility isotherms assume, and in instances Zimm-Lundberg analysis of the solubilities show, that glassy polymers are heterogeneous and that the distribution of the solute in the polymer is also inhomogeneous. under some conditions, the heterogeneities cannot be represented as holes. a mathematical model describing diffusion in inhomogeneous polymer membranes is presented using Cahn and Hilliard's gradient theory. the fractional mass uptake is found to be proportional to the fourth root of time rather than the square root, predicted by Fickian diffusion. This type of diffusion is classified as pseudo-Fickian. the model is compared with one experimental …
54. Burkart Philipp, Otto Vogl, Ch. Wandrey
54. Burkart Philipp, Otto Vogl, Ch. Wandrey
Emeritus Faculty Author Gallery
No abstract provided.
Interphase Mass Transfer From Bubbles, Drops, And Solid Spheres: Diffusional Transport Enhanced By External Chemical Reaction, Leonid S. Kleinman, X. B. Reed
Interphase Mass Transfer From Bubbles, Drops, And Solid Spheres: Diffusional Transport Enhanced By External Chemical Reaction, Leonid S. Kleinman, X. B. Reed
Chemical and Biochemical Engineering Faculty Research & Creative Works
Interphase mass transfer has been analyzed for a reactant being transferred from a sphere into a quiescent, infinite continuous phase where it undergoes a chemical reaction. Ranges of the diffusivity ratio D, the distribution coefficient H, and the Damköhler number Da have been delineated, within which the overall resistance to mass transfer may be reasonably ascribed to the sum of the individual resistances in each of the two phases. Outside these parameter ranges, the resistances for two decoupled mass transfer problems may not be added to give the overall resistance to the coupled mass transfer problem. An alternative procedure for …
Perfusion Chromatography: Performance Of Periodic Countercurrent Column Operation And Its Comparison With Fixed-Bed Operation, G. A. Heeter, Athanasios I. Liapis
Perfusion Chromatography: Performance Of Periodic Countercurrent Column Operation And Its Comparison With Fixed-Bed Operation, G. A. Heeter, Athanasios I. Liapis
Chemical and Biochemical Engineering Faculty Research & Creative Works
Simulation studies using mathematical models that describe the single-component adsorption of bovine serum albumin into spherical bidisperse perfusive and spherical bidisperse purely diffusive anion-exchange porous adsorbent particles in a single-column fixed-bed system and in a two-column periodic countercurrent system in which the adsorbent is equally distributed over two beds are presented. The total length of the two-column periodic countercurrent system is equal to the length of the single-column fixed-bed system, and studies are performed for different values of the intraparticle Peclet number, Peintra, and of the microsphere diameter, dm. In the single-column fixed-bed system, the percentage utilization of the adsorptive …
55. Hermann Janeschitz-Kriegl, Otto Vogl, Anton Schausberger
55. Hermann Janeschitz-Kriegl, Otto Vogl, Anton Schausberger
Emeritus Faculty Author Gallery
No abstract provided.
56. Sir Geoffrey Allan, Otto Vogl, Shigeko Suzuki
56. Sir Geoffrey Allan, Otto Vogl, Shigeko Suzuki
Emeritus Faculty Author Gallery
No abstract provided.
57. Peter Plesch, Otto Vogl, Traudl Plesch
57. Peter Plesch, Otto Vogl, Traudl Plesch
Emeritus Faculty Author Gallery
No abstract provided.
Precision Total Pressure Measurements Of Propyne With Propane, Propene, And Propadiene, Edward A. Kyser, David B. Manley
Precision Total Pressure Measurements Of Propyne With Propane, Propene, And Propadiene, Edward A. Kyser, David B. Manley
Chemical and Biochemical Engineering Faculty Research & Creative Works
Experimental total pressure measurements of propyne mixed with propane, propene, and propadiene are presented for five isotherms from 253 to 353 K. Thermodynamically consistent vapor compositions and saturated phase densities are calculated using a cubic equation of state with three isothermal pure component parameters and two binary mixture parameters. The precision vapor—liquid equilibrium cell and experimental procedure which are particularly useful for measurements involving close boiling light hydrocarbons are described, and the experimental and modeled results are presented. © 1995, American Chemical Society. All rights reserved.
58. Koichi Hatada, Otto Vogl, Michiko Hatada
58. Koichi Hatada, Otto Vogl, Michiko Hatada
Emeritus Faculty Author Gallery
No abstract provided.
59. Otto Kratky, 1902-1995, Otto Vogl, Josef Schurz
59. Otto Kratky, 1902-1995, Otto Vogl, Josef Schurz
Emeritus Faculty Author Gallery
No abstract provided.
60. Teiji Tsuruta, Otto Vogl
A New Spray Evaporation Model Based On Droplet Interface Phenomena, Nihad E. Daidzic, Gangolf Kohnen, Martin Sommerfeld
A New Spray Evaporation Model Based On Droplet Interface Phenomena, Nihad E. Daidzic, Gangolf Kohnen, Martin Sommerfeld
Aviation Department Publications
In this work the influence of droplet shape oscillations on droplet evaporation is shown. Through nonlinear mode interactions, turbulence and aerodynamic triggering of vibrations cause by vortex shedding, droplets always oscillates in spray flows. Droplet shape oscillation cause higher evaporation rates through several physical phenomena such as an average increase of the superficial surface area, periodic micro-convection and boundary layer destruction, and local saturation pressure changes due to local curvature effects. The inviscid theory of small-amplitude droplet oscillations was used which resulted in better agreement with the measurement data of droplet size distributions in sprays for different axial coordinates.
61. Marian Kryszewski, Otto Vogl
61. Marian Kryszewski, Otto Vogl
Emeritus Faculty Author Gallery
No abstract provided.
Excess Heat Capacity Surfaces For Water-Alkanol Mixtures By The Uniquac Model, Yaşar Demirel, Halime Ö. Paksoy
Excess Heat Capacity Surfaces For Water-Alkanol Mixtures By The Uniquac Model, Yaşar Demirel, Halime Ö. Paksoy
Papers in Physical Chemistry
Hydroorganic mixtures are industrial solvents that can serve as media to solubilize either water in hydrocarbon or a hydrophobic substance in water. In many cases the solubilizing capability is obtained via a homogeneous complex aqueous mixtures containing an alcohol. Since excess heat capacity CPE, is very sensitive to structural changes in mixtures, concentration and temperature dependence of CPE have been calculated by using the UNIQUAC model for the mixtures methanol(l)-water(%, ethanol(l)-water(2), and l-propanol(l)-water(2). The temperature-dependent parameters of the model estimated directly from CPE data at more than one different isotherm are used in …
Reaction Fronts In A Porous Medium. Approximation Techniques Versus Numerical Solution, Fernando Escobedo, Hendrik J. Viljoen
Reaction Fronts In A Porous Medium. Approximation Techniques Versus Numerical Solution, Fernando Escobedo, Hendrik J. Viljoen
Papers in Reaction Kinetics
The flame sheet approximation (FS) and a novel polynomial approximation technique (PA) are compared in terms of their capability to describe reaction fronts of highly exothermic reactions in a porous medium. A one-phase model and a two-phase model of a system with adiabatic walls and a radiant output (to approximate the case of a porous radiant burner) are included in the analysis. By matching the reaction zone solution found by either the FS or PA method with the solutions of the nonreacting zones, the temperature, conversion, and position of the reaction zone were determined. Numerical solutions for catalytic and noncatalytic …
62. David M Solomon, Otto Vogl, Kenneth Ghiggino
62. David M Solomon, Otto Vogl, Kenneth Ghiggino
Emeritus Faculty Author Gallery
No abstract provided.
Reproducible Technique For Packing Laboratory-Scale Trickle-Bed Reactors With A Mixture Of Catalyst And Fines, Muthanna H. Al-Dahhan, Yuanxin Wu, Milorad P. Duduković
Reproducible Technique For Packing Laboratory-Scale Trickle-Bed Reactors With A Mixture Of Catalyst And Fines, Muthanna H. Al-Dahhan, Yuanxin Wu, Milorad P. Duduković
Chemical and Biochemical Engineering Faculty Research & Creative Works
A Reproducible Procedure for Packing Small-Diameter Packed Beds with a Mixture of Fines and Catalyst is Reported. Such Beds Are Essential for Process Catalyst Testing in Trickle-Flow Reactors. Packing Uniformity Along the Bed, Reproducibility of Single-Phase Pressure Drop and Reproducibility of Liquid Holdup and Two-Phase Flow Pressure Drop in Repacked Beds Has Been Demonstrated. © 1995, American Chemical Society. All Rights Reserved.
63. Ivan Panayotov, Otto Vogl, Christo Tsvetanov
63. Ivan Panayotov, Otto Vogl, Christo Tsvetanov
Emeritus Faculty Author Gallery
No abstract provided.
Spinodals In A Polymer-Dispersed Liquid-Crystal, Chungsea Shen, Thein Kyu
Spinodals In A Polymer-Dispersed Liquid-Crystal, Chungsea Shen, Thein Kyu
College of Polymer Science and Polymer Engineering
Thermodynamic phase equilibria of a polymer dispersed liquid crystal (PDLC) consisting of
monomeric liquid crystals and a polymer have been investigated theoretically and experimentally.
The equilibrium limits of phase separation as well as phase transition of a PDLC system were
calculated by taking into consideration the Flory–Huggins (FH) theory for the free energy of mixing
of isotropic phases in conjunction with the Maier–Saupe ~MS! theory for phase transition of a
nematic liquid crystal. The correspondence between the Landau–de Gennes expansion and the
Maier–Saupe theory was found and the coefficients were evaluated. The calculation based on the
combined FH-MS theory predicted …
Large Scale Isolation Of Expression Vector Cassette By Magnetic Triple Helix Affinity Capture, Srinivas V. Sonti, Matthew C. Griffor, T. Sano, S. Narayanswami, Arijit Bose, C. R. Cantor, Albert P. Kausch
Large Scale Isolation Of Expression Vector Cassette By Magnetic Triple Helix Affinity Capture, Srinivas V. Sonti, Matthew C. Griffor, T. Sano, S. Narayanswami, Arijit Bose, C. R. Cantor, Albert P. Kausch
Chemical Engineering Faculty Publications
No abstract provided.
Hydrogen-Atom Direct-Entry Mechanism Into Metal Membranes, G. Zheng, Branko N. Popov, Ralph E. White
Hydrogen-Atom Direct-Entry Mechanism Into Metal Membranes, G. Zheng, Branko N. Popov, Ralph E. White
Faculty Publications
The hydrogen-atom direct-entry mechanism is used to explain why the steady-state hydrogen permeation current density through a metal membrane is directly proportional to the cathodic current density, ic, and is independent of the membrane thickness when ic is small.
A Parallel-Plate Electrochemical Reactor Model For The Destruction Of Nitrate And Nitrite In Alkaline Waste Solutions, D. H. Coleman, Ralph E. White, D. T. Hobbs
A Parallel-Plate Electrochemical Reactor Model For The Destruction Of Nitrate And Nitrite In Alkaline Waste Solutions, D. H. Coleman, Ralph E. White, D. T. Hobbs
Faculty Publications
A parallel-plate electrochemical reactor model with multiple reactions at both electrodes and anolyte and catholyte recirculation tanks was modeled for the electrochemical destruction of nitrate and nitrite species in an alkaline solution. The model can be used to predict electrochemical reaction current efficiencies and outlet concentrations of species from the reactor, given inlet feed conditions and cell operating conditions. Also, predictions are made for off-gas composition and liquid-phase composition in the recirculation tanks. The results of case studies at different applied potentials are shown here. At lower applied potentials, the model predictions show that the destruction process is more energy …
Teaching Statistical Experimental Design Using A Laboratory Experiment, Douglas K. Ludlow, Kirk H. Schulz, John Erjavec
Teaching Statistical Experimental Design Using A Laboratory Experiment, Douglas K. Ludlow, Kirk H. Schulz, John Erjavec
Chemical and Biochemical Engineering Faculty Research & Creative Works
An Experimental Project Introduces the Concepts of Statistical Experimental Design to Undergraduates in a Laboratory Setting. a Safe, Inexpensive and Easily Operable Experiment Uses a Gas Chromatograph to Give Quantitative Results and to Allow Students to Concentrate on Applying Statistical Skills Without Being Impeded by Complex Equipment or Experimental Methods. One of the Unique Aspects of the Experiment is a Trade‐off between the Two Most Significant Variables, Forcing Students to Compromise in the Selection of Optimum Conditions. Such Compromises Are Typical in Many Real‐world Industrial Situations. the Experiment Has Been Used for Several Years in the Undergraduate Chemical Engineering Laboratories …