David Tomasko - Academia.edu (original) (raw)
Papers by David Tomasko
The Journal of Physical Chemistry, 1993
Cosolvents can be used to tailor supercritical fluid solvents for increased selectivity by increa... more Cosolvents can be used to tailor supercritical fluid solvents for increased selectivity by increasing the solvent polarity or polarizability and participating in specific interactions with solutes. Specific interactions in these fluids are often inferred from thermodynamics measurements although independent confirmation of the structure of cosolvent/solute interactions is lacking. The solutes 2-naphthol, 5-cyano-2-naphthol, and 7-azaindole exhibit well-characterized spectral responses to an
34th Annual Frontiers in Education, 2004. FIE 2004., 2004
International journal of pharmaceutics, Jan 11, 2006
The aim of the current research project was to explore the possibilities of combining pressurized... more The aim of the current research project was to explore the possibilities of combining pressurized carbon dioxide with hot stage extrusion during manufacturing of solid dispersions of the thermally labile p-aminosalicylic acid (p-ASA) and ethylcellulose 20cps (EC 20cps) and to evaluate the ability of the pressurized gas to act as a temporary plasticizer. The thermal stability of the p-ASA was investigated using DSC, TGA and HPLC. The compound decomposes completely upon melting. Below 110 degrees C and under atmospheric conditions, the compound is thermally stabile for 10min. Pressurized carbon dioxide was injected into a Leistritz Micro 18 intermeshing co-rotating twin-screw melt extruder using an ISCO 260D syringe pump. Carbon dioxide acted as plasticizer for p-ASA/EC 20cps, reducing the processing temperature during the hot stage extrusion process. HPLC showed that without carbon dioxide injection, approximately 17% of p-ASA degraded, while less than 5% degraded with CO(2) injectio...
Seagrasses: Biology, Ecology and Conservation, 2006
... Catrion`a MO Macinnis-Ng Institute for Water and Environmental Resource Management, Universit... more ... Catrion`a MO Macinnis-Ng Institute for Water and Environmental Resource Management, University of Technology, Sydney, Westbourne St Gore Hill NSW 2065, Australia I. Introduction ... Page 2. 568 PJ Ralph, D. Tomasko, K. Moore, S. Seddon, and CMO Macinnis-Ng Fig. ...
Industrial & Engineering Chemistry Research, 1992
Page 1. Ind. Eng. Chem. Res. 1992,31, 1105-1110 SEPARATIONS 1105 Supercritical Fluid Fractionatio... more Page 1. Ind. Eng. Chem. Res. 1992,31, 1105-1110 SEPARATIONS 1105 Supercritical Fluid Fractionation of a Nonionic Surfactant Charles A. Eckert,* Michael P. Ekart, Barbara L. Knutson, Kirk P. Payne, and David L. Tomasko ...
Limnology and Oceanography, 2006
We reconstructed water quality changes for 1800 to 2000 in Charlotte Harbor (Florida), a shallow ... more We reconstructed water quality changes for 1800 to 2000 in Charlotte Harbor (Florida), a shallow subtropical estuary, by using a suite of biological and geochemical proxies in dated sediments collected in the region of a present day, midsummer hypoxic zone. The declining freshwater loading into the estuary from 1931 to the 1980s is not the probable causal agent encouraging the
Journal of Supercritical Fluids, 2007
The electrospinning of polymers has become a potentially important process for the production of ... more The electrospinning of polymers has become a potentially important process for the production of tissue engineering scaffolds. CO2 impregnation of these scaffolds may provide a method for tailoring the chemistry of these relatively high surface area scaffolds without altering their biomimetic architecture. In pursuing this we found that electrospun polycaprolactone (PCL) fibers melt when exposed to supercritical CO2 even at
Proceedings. Frontiers in Education. 36th Annual Conference, 2006
Current Opinion in Solid State & Materials Science, 2003
Supercritical fluids have been used to synthesize and foam a variety of polymer nanocomposite mat... more Supercritical fluids have been used to synthesize and foam a variety of polymer nanocomposite materials. There have been significant advances in developing and characterizing nanoscale structures and using supercritical fluids to alter properties at the nanoscale. In this work we summarize these advances and discuss foam properties generated using supercritical carbon dioxide as well as relevant fundamental properties of the
Sedimentary Geology, 2006
Polymer Engineering & Science, 1999
Polymer Engineering & Science, 2002
Polymer Engineering & Science, 2003
... Ramesh et aL (38, 39) developed a model for heterogeneous nu-cleation in the blend of polysty... more ... Ramesh et aL (38, 39) developed a model for heterogeneous nu-cleation in the blend of polystyrene (PS) and high im-pact polystyrene (HIPS) based on a micro-void theory that assumes micro-voids exist at the filler-polymer interface. ...
Polymer Engineering & Science, 2007
Materials Science and Engineering: C, 2007
Limnology and Oceanography, 2006
The Journal of Physical Chemistry, 1993
Cosolvents can be used to tailor supercritical fluid solvents for increased selectivity by increa... more Cosolvents can be used to tailor supercritical fluid solvents for increased selectivity by increasing the solvent polarity or polarizability and participating in specific interactions with solutes. Specific interactions in these fluids are often inferred from thermodynamics measurements although independent confirmation of the structure of cosolvent/solute interactions is lacking. The solutes 2-naphthol, 5-cyano-2-naphthol, and 7-azaindole exhibit well-characterized spectral responses to an
34th Annual Frontiers in Education, 2004. FIE 2004., 2004
International journal of pharmaceutics, Jan 11, 2006
The aim of the current research project was to explore the possibilities of combining pressurized... more The aim of the current research project was to explore the possibilities of combining pressurized carbon dioxide with hot stage extrusion during manufacturing of solid dispersions of the thermally labile p-aminosalicylic acid (p-ASA) and ethylcellulose 20cps (EC 20cps) and to evaluate the ability of the pressurized gas to act as a temporary plasticizer. The thermal stability of the p-ASA was investigated using DSC, TGA and HPLC. The compound decomposes completely upon melting. Below 110 degrees C and under atmospheric conditions, the compound is thermally stabile for 10min. Pressurized carbon dioxide was injected into a Leistritz Micro 18 intermeshing co-rotating twin-screw melt extruder using an ISCO 260D syringe pump. Carbon dioxide acted as plasticizer for p-ASA/EC 20cps, reducing the processing temperature during the hot stage extrusion process. HPLC showed that without carbon dioxide injection, approximately 17% of p-ASA degraded, while less than 5% degraded with CO(2) injectio...
Seagrasses: Biology, Ecology and Conservation, 2006
... Catrion`a MO Macinnis-Ng Institute for Water and Environmental Resource Management, Universit... more ... Catrion`a MO Macinnis-Ng Institute for Water and Environmental Resource Management, University of Technology, Sydney, Westbourne St Gore Hill NSW 2065, Australia I. Introduction ... Page 2. 568 PJ Ralph, D. Tomasko, K. Moore, S. Seddon, and CMO Macinnis-Ng Fig. ...
Industrial & Engineering Chemistry Research, 1992
Page 1. Ind. Eng. Chem. Res. 1992,31, 1105-1110 SEPARATIONS 1105 Supercritical Fluid Fractionatio... more Page 1. Ind. Eng. Chem. Res. 1992,31, 1105-1110 SEPARATIONS 1105 Supercritical Fluid Fractionation of a Nonionic Surfactant Charles A. Eckert,* Michael P. Ekart, Barbara L. Knutson, Kirk P. Payne, and David L. Tomasko ...
Limnology and Oceanography, 2006
We reconstructed water quality changes for 1800 to 2000 in Charlotte Harbor (Florida), a shallow ... more We reconstructed water quality changes for 1800 to 2000 in Charlotte Harbor (Florida), a shallow subtropical estuary, by using a suite of biological and geochemical proxies in dated sediments collected in the region of a present day, midsummer hypoxic zone. The declining freshwater loading into the estuary from 1931 to the 1980s is not the probable causal agent encouraging the
Journal of Supercritical Fluids, 2007
The electrospinning of polymers has become a potentially important process for the production of ... more The electrospinning of polymers has become a potentially important process for the production of tissue engineering scaffolds. CO2 impregnation of these scaffolds may provide a method for tailoring the chemistry of these relatively high surface area scaffolds without altering their biomimetic architecture. In pursuing this we found that electrospun polycaprolactone (PCL) fibers melt when exposed to supercritical CO2 even at
Proceedings. Frontiers in Education. 36th Annual Conference, 2006
Current Opinion in Solid State & Materials Science, 2003
Supercritical fluids have been used to synthesize and foam a variety of polymer nanocomposite mat... more Supercritical fluids have been used to synthesize and foam a variety of polymer nanocomposite materials. There have been significant advances in developing and characterizing nanoscale structures and using supercritical fluids to alter properties at the nanoscale. In this work we summarize these advances and discuss foam properties generated using supercritical carbon dioxide as well as relevant fundamental properties of the
Sedimentary Geology, 2006
Polymer Engineering & Science, 1999
Polymer Engineering & Science, 2002
Polymer Engineering & Science, 2003
... Ramesh et aL (38, 39) developed a model for heterogeneous nu-cleation in the blend of polysty... more ... Ramesh et aL (38, 39) developed a model for heterogeneous nu-cleation in the blend of polystyrene (PS) and high im-pact polystyrene (HIPS) based on a micro-void theory that assumes micro-voids exist at the filler-polymer interface. ...
Polymer Engineering & Science, 2007
Materials Science and Engineering: C, 2007
Limnology and Oceanography, 2006