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Dr. Charles Medom Hansen (born 1938 in 
He was Director of the Scandinavian Paint & Printing Ink Research Institute in
Louisville, Kentucky
Louisville ( , , ) is the largest city in the Commonwealth of Kentucky and the 28th most-populous city in the United States. Louisville is the historical seat and, since 2003, the nominal seat of Jefferson County, on the Indiana border ...
) is an American-born scientist with Danish ancestry who is now a Danish citizen living in the Copenhagen area.
After a degree (1961, Louisville) and Masters (1962, Wisconsin) in chemical engineering, Hansen worked for his Ph.D. at the Technical University of Denmark
The Technical University of Denmark ( da, Danmarks Tekniske Universitet), often simply referred to as DTU, is a polytechnic university and school of engineering. It was founded in 1829 at the initiative of Hans Christian Ørsted as Denmark's fi ...
, initially on the problems of solvent retention in polymers, starting his lifetime interest in diffusion science. However, the problems of predicting the compatibility of solvents with polymers took over, leading him to overcome the problems of the Hildebrand solubility parameter The Hildebrand solubility parameter (δ) provides a numerical estimate of the degree of interaction between materials and can be a good indication of solubility, particularly for nonpolar materials such as many polymers. Materials with similar valu ...
by dividing Hildebrand's single parameter into three components: dispersion, polar and hydrogen bonding. His 1967 doctoral thesis (Dr. techn.) provided the basis for what came to be called Hansen solubility parameter Hansen solubility parameters were developed by Charles M. Hansen in his Ph.D thesis in 1967 as a way of predicting if one material will dissolve in another and form a solution. They are based on the idea that like dissolves like where one molecule ...
s, or HSPs. In addition to providing a theoretical framework, the thesis provided the first working set of HSP values for common solvents and for a range of commercial polymers, making it of immediate practical use to academia and industry.
His theories were put to immediate use during his 8 years (1968–76) at the R/D Center, PPG Industries
PPG Industries, Inc. is an American Fortune 500 company and global supplier of paints, coatings, and specialty materials. With headquarters in Pittsburgh, Pennsylvania, PPG operates in more than 70 countries around the globe. By revenue it is ...
in Pittsburgh where the universality of HSP became apparent as they were shown to work equally well for problems such as optimising the compatibility of pigments within paint and ink formulations. Gradually they became adopted more widely as shown by the cumulative graph of Google Scholar citations for the phrase "Hansen Solubility Parameter".
He was Director of the Scandinavian Paint & Printing Ink Research Institute in Hørsholm
Hørsholm () is an urban area on the Øresund coast approximately north of Copenhagen, Denmark. It covers most of Hørsholm Municipality and straddles the borders neighbouring Fredensborg Municipality and Rudersdal Municipality.
Hørsholm prope ...
, Denmark
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from 1976 to 1985, a Senior Scientist at Hempel Group
Hempel A/S is a global supplier of coatings and services in the protective, marine, decorative, container and yacht industries. Hempel factories, R&D centres and stock points are established in every region and the company was founded in Copenhage ...
from 1985 to 1987, then Senior Scientist at FORCE Technology, Copenhagen
Copenhagen ( or .; da, København ) is the capital and most populous city of Denmark, with a proper population of around 815.000 in the last quarter of 2022; and some 1.370,000 in the urban area; and the wider Copenhagen metropolitan ar ...
from 1988 to 2004. Upon retirement, he became, and remains, an independent consultant.
In addition to over 130 published papers and 8 patents (h-index 25), he authored Hansen Solubility Parameters – A User's Handbook in 1999 followed by an expanded 2nd Edition in 2007. With Abbott and Yamamoto he authored the package of software, eBook, and datasets called Hansen Solubility Parameters in Practice, in 2008 which is currently in its 5th Edition.Steven Abbott, Charles Hansen, Hiroshi Yamamoto, Hansen Solubility Parameters in Practice - software, eBook, datasets. http://www.hansen-solubility.com/HSPiP/
References
{{DEFAULTSORT:Hansen, Charles Medom Danish chemical engineers 1938 births Living people Scientists from Louisville, Kentucky Technical University of Denmark alumni American emigrants to Denmark