Richard Yeo Swee Chye (Chinese: 楊瑞才) is an American scientist with 17 U.S. patents, best known for his research on disposable diapers.[1]
Yeo co-invented US patent 5,356,626: "Synthetic fecal fluid compound."[2] At the time, Yeo was a senior research scientist working in Roswell, Georgia[3] for Kimberly-Clark,[1] makers of Huggies. He, along with Debra Welchel, developed the material to help the company produce better disposable diapers.[4][5]
Yeo described his research as:[1]
The technicians have some objection to handling the real thing, a form of biologically hazardous material. Also, it's a bit difficult to obtain, even from infants. We had some fundamental studies of real feces, so we knew what properties we needed. So we developed a synthetic one as close to the real thing as possible. There's no odor -- the technicians wouldn't consent to work on a project like that -- and it can be any color we want.
Yeo conducted extensive research & developed various disposable diapers & personal care products having new features: breathable back sheets, colorful/embossed backsheets, improved BM flaps and better BM containment, better body liners, flushable materials for constructing diapers, odor control, and better tampons.
From 1970-75, Yeo conducted doctorate thesis research on Nafion[6] under the supervision of Adi Eisenberg (Otto Maass Professor of McGill University). In 1977, Yeo and Eisenberg published the earliest peer-reviewed journal article on Nafion.[7]
Yeo continued to publish on Nafion,[8][9][10][11] conducting several comprehensive theoretical studies of the swelling properties of Nafion membrane in various organic and methanol-containing solvents. Yeo found that these perfluorinated ionomer membranes exhibit dual cohesive energy densities. This was referred to by McCain and Covitch as the Yeo Envelope.[12] The commercial importance of Yeo's earliest studies of the unique swelling behavior of Nafion membrane was cited and described by Doyle and Rajendran in the Handbook of Fuel Cells as:[13]
These early swelling studies are the benchmark for a number of more recent studies of the behavior of Nafion membranes when exposed to organic solvents as this topic has become of greater commercial importance with the development of processes for creating Nafion solutions through dissolution in organic solvent mixtures.
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