Search

Your search keyword '"Morgan, Patrick J."' showing total 19 results
Start Over Author "Morgan, Patrick J."
19 results on '"Morgan, Patrick J."'

9. Linking the the thermal and electronic properties of functional dicationic salts with their molecular structures

Author

Clarke, Coby J., Morgan, Patrick J., Hallett, Jason P., and Licence, Peter

Abstract

The two major properties that underpin ionic liquids are tunability and the potential to create task-specific media. Together, these properties allow ionic liquids to surpass the roles long held by traditional molecular solvents. However, at elevated temperatures or under prolonged heating, the structural components that impart such properties decompose or degrade. Dicationic pyridine salts present new opportunities to extend functionality and tunability to high temperatures because they are coordinating and thermally robust. In this work, we present three structurally related series of dicationic pyridine salts, which have been characterized by a wide array of techniques to link thermal and electronic properties to structural variation. The phase transitions and thermal stabilities of the salts were significantly influenced by small structural changes, and several new candidates for high-temperature-based applications were identified. The electron density, and therefore the electron donating ability, of the pyridine functional group could also be controlled by structural variation of cations and anions. Therefore, dicationic pyridine salts are highly tunable choices for task-specific solvents at elevated temperatures. Importantly, thermally robust solvents not only extend operational ranges but also reduce the need to replace or replenish solvents that degrade over time at temperatures commonly employed in industrial settings (i.e., 150−200 °C); solvent lifetimes are extended, and production is reduced. This is a critical requirement for complex media such as ionic liquids, which have high economic and environmental production costs.

Published
2021

14. Rent insurance: are you covered?

Author

Morgan, Patrick J. and Williamson, Julie Anne Stulce

Subjects
Tenants' insurance -- Laws, regulations and rules
Published
1996

17. Lower Extremity Strength Is Correlated with Walking Function After Incomplete SCI.

Author

Holthaus, Katy D., Morgan, Patrick J., Embry, Aaron E., Perry, Lindsay A., Bowden, Mark G., Gregory, Chris M., and DiPiro, Nicole D.

Abstract

Background: Lower extremity strength has been reported to relate to walking ability, however, the relationship between voluntary lower extremity muscle function as measured by isokinetic dynamometry and walking have not been thoroughly examined in individuals with incomplete spinal cord injury (iSCI). Objective: To determine the extent to which measures of maximal voluntary isometric contraction (MVIC) and rate of torque development (RTD) in the knee extensor (KE) and plantar flexor (PF) muscle groups correlate with self-selected overground walking speed and spatiotemporal characteristics of walking. Methods: Twenty-two subjects with chronic (>⃒6 months) iSCI participated in a cross-sectional study. Values for MVIC and RTD in the KE and PF muscle groups were determined by isokinetic dynamometry. Walking speed and spatiotemporal characteristics of walking were measured during overground walking. Results: MVIC in the KE and PF muscle groups correlated significantly with walking speed. RTD was significantly correlated with walking speed in both muscle groups, the more-involved PF muscle group showing the strongest correlation with walking speed (r = 0.728). RTD in the KE and PF muscle groups of the more-involved limb was significantly correlated with single support time of the more-involved limb. Conclusion: These data demonstrate that lower extremity strength is associated with walking ability after iSCI. Correlations for the muscle groups of the move-involved side were stronger compared to the less-involved limb. In addition, PF function is highlighted as a potential limiting factor to walking speed along with the importance of RTD. [ABSTRACT FROM AUTHOR]

Published
2015
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results