Characterization of Particle-Interactions by Atomic Force Microscopy: Effect of Contact Area View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2003-03

AUTHORS

Jennifer C. Hooton, Caroline S. German, Stephanie Allen, Martyn C. Davies, Clive J. Roberts, Saul J. B. Tendler, Philip M. Williams

ABSTRACT

PURPOSE: The purpose of this work was to compare adhesion forces, contact area, and work of adhesion of salbutamol sulphate particles produced using micronization and a supercritical fluid technique (solution-enhanced dispersion by supercritical fluids--SEDS) using atomic force microscopy (AFM). METHODS: Adhesion forces of individual particles of micronized and SEDS salbutamol against a highly orientated pyrolytic graphite surface were acquired in a liquid environment consistent with that of a pressurized metered dose inhaler. The forces were then related to contact area and work of adhesion. RESULTS: The raw adhesion force data for the micronized and SEDS material were 14.1 nN (SD 2.5 nN) and 4.2 nN (SD 0.8 nN), respectively. After correction for contact area, the forces per unit area were 13 mN/microm2 (SD 2.3 mN/microm2) and 3 mN/microm2 (SD 0.6 mN/microm2). The average work of adhesion was calculated using the Johnson-Kendall-Roberts theory and was found to be 19 mJm(-2) (SD 3.4 mJm(-2)) for the micronized particle and 4 mJm(-2) (SD 0.8 mJm(-2)) for the SEDS particle. CONCLUSIONS: It is possible to produce a three-dimensional representation of the contact area involved in the interaction and make quantitative comparisons between different particles. There was a lower force per unit area and work of adhesion observed for the SEDS material, possibly because of its lower surface free energy. More... »

PAGES

508-514

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1022684911383

DOI

http://dx.doi.org/10.1023/a:1022684911383

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1001396379

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/12669976


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43 schema:description PURPOSE: The purpose of this work was to compare adhesion forces, contact area, and work of adhesion of salbutamol sulphate particles produced using micronization and a supercritical fluid technique (solution-enhanced dispersion by supercritical fluids--SEDS) using atomic force microscopy (AFM). METHODS: Adhesion forces of individual particles of micronized and SEDS salbutamol against a highly orientated pyrolytic graphite surface were acquired in a liquid environment consistent with that of a pressurized metered dose inhaler. The forces were then related to contact area and work of adhesion. RESULTS: The raw adhesion force data for the micronized and SEDS material were 14.1 nN (SD 2.5 nN) and 4.2 nN (SD 0.8 nN), respectively. After correction for contact area, the forces per unit area were 13 mN/microm2 (SD 2.3 mN/microm2) and 3 mN/microm2 (SD 0.6 mN/microm2). The average work of adhesion was calculated using the Johnson-Kendall-Roberts theory and was found to be 19 mJm(-2) (SD 3.4 mJm(-2)) for the micronized particle and 4 mJm(-2) (SD 0.8 mJm(-2)) for the SEDS particle. CONCLUSIONS: It is possible to produce a three-dimensional representation of the contact area involved in the interaction and make quantitative comparisons between different particles. There was a lower force per unit area and work of adhesion observed for the SEDS material, possibly because of its lower surface free energy.
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