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 Expert  718606

Expert in Rheological Measurement

Available for your Consulting and Expert Witness Needs

Oregon (OR)
Education Work History Career AccomplishmentsPublicationsConsulting Services Expert Witness

Summary of Expertise:

Listed with other top experts in: 

Expert has expertise in applied research and product development combining the fields of rheology and colloidal chemistry. He is experienced with the formulation and rheological classification of dyes and pigments. He has investigated the rheological properties of magnetic and carbon black pigment suspensions as they effect coating processes (including knife, gravure, 3-roll, and slot coating). Expert has also conducted applied research on consumer products such as suspensions, dispersions, surfactant- and polymer-thickened cleaning products, pastes, and foods (particularly salad dressings and sauces). He developed a rheological technique for measuring the phase inversion temperature of nonionic surfactant/oil/water emulsions and for tracking phase changes of surfactant systems. This is the only technique available that can follow both a cloud point and a lamellar phase transition in dilute surfactant solutions. He has established several rheological laboratories and purchased the associated equipment.

rheological measurement



Expert served as an expert consultant to product development groups on issues of stability, phase behavior, viscous and wetting behavior, and processing needs. In conjunction with product development, he ascertained the effects of soluble polymer binders, surfactants, lubricants, and processing conditions on the stability and coatability of metal oxide and metal dispersions. His work in this area has led to improved quality control and yields by controlling the rheological properties of the magnetic dispersions.





viscosity measurement

Much of Expert's career has concentrated on dispersions (solid-liquid, liquid-liquid), both concentrated dispersions and low volume-fractions (such as inks). Because of his earlier work with laboratory formulation and processing of flame-retardant coatings, Expert has gained strong working knowledge of dispersion equipment and techniques. He developed a 3-dimensional dynamic rheological technique to predict the long-term stability of concentrated suspensions. He also discovered and patented surfactant mixtures with extensional properties useful for reducing misting in spray applications.

dispersion rheology


dispersion technology

While most of the extensional viscosity work has been done on plastics and extruded melted polymers, much of Expert's work has centered on low-viscosity fluids (such as cleaning sprays) and especially on salad dressings, where he has used the extensional viscosity measures to correlate mouthfeel. Expert believes this area remains relatively unexplored because of the difficulty of the experiments and lack of knowledge as to its importance.

extensional viscosity

Expert's work has taken him to the extremes of rheological measurement, from fluids with viscosities close to water, to pastes with viscosities in the millions of centipoises. His range of experimental experience varies according to the material and the properties of interest, but he has run oscillatory experiments as well as creep, viscosity, relaxation, and extensional tests and combinations of these to mimic production or processing conditions.

fluid rheology measurement


liquid rheological measurement

Because of the various materials he has studied and the differing requirements of each, Expert has gained extensive experience comparing rheometers of the major rheological equipment suppliers. He is familiar with the leading equipment designs, controlled strain and controlled stress rheometers, as well as extensional rheometers. He is also familiar with their strengths and weaknesses, especially for research versus quality control needs.


Expert understands how the viscosity of a material can be controlled by its temperature, concentration of actives, or by additives that can interact with the mobile solvent phase or with the particles in a dispersion. He has improved production processes by indicating where the viscosity was most useful at a particular temperature, or by the addition of thickeners (with and without gel forming properties). The colloidal chemistry can also play a huge role (as in mineral oxide dispersions) where precipitation and thickening can occur at the right pH. By determining the rheology as a function of pH, Expert was able to help manufacturing personnel understand the process of dispersing these oxides and how to control the viscosity.


viscosity control

Show Secondary and Basic Areas of Expertise
Expert may consult nationally and internationally, and is also local to the following cities: Portland, Oregon;  Eugene, Oregon;  Salem, Oregon;  Gresham, Oregon;  Beaverton, Oregon;  Hillsboro, Oregon;  Springfield, Oregon;  Bend, Oregon;  and Vancouver, Washington.

Year   Degree   Subject   Institution  
1985   PhD   Physical Inorganic Chemistry   University of California, Santa Barbara  
1979   BA   Chemistry   Rutgers University  

Work History:
Years   Employer   Title  

1994 to




Research Scientist


1992 to 1994


Ampex Recording Media Corporation


Staff Rheologist


1985 to 1992


Clorox Technical Center


Senior Scientist


Career Accomplishments:

He is a member of the American Chemical Society and the Society of Rheology.


Expert won the 1992 Distinguished Paper Award from the Soap and Detergent Association, Surfactant and Detergents Section.


Consulting Services:
Recent Client Requests:
  • Expert for consulting on Colorants.
  • Expert in pseudo plastic fluids for consulting on theological properties to disperse in air when it exits a wide tube at very high speed.
  • Expert in pressed soap for consulting on manufacturing short-run batches.
  • Surfactant expert consulting on softness testing for Laundry detergent.
  • Food expert for consulting on sauce & dressing formulation.
  • Lighting wavelengths expert for consulting on physics in the whole electromagnetic spectrum.
Click the green button above to contact Expert for a free initial screening call regarding your expert consulting needs.  Expert is available for consulting to corporate, legal and government clients.  Remember, your initial screening call to speak with Expert is free.

Expert Witness:
Click the green button above to contact Expert for a free initial screening call regarding expert testimony, litigation consulting and support, forensic services, or any related expert witness services.  A few litigation needs include product liability, personal injury, economic loss, intellectual property (patent, trademark, trade secret, copyright), and insurance matters.  Remember, your initial screening call to speak with Expert is free.

International Experience:
Country / Region   Summary
Japan   He conducted technological exchanges in Japan in the area of metal particle magnetic dispersions and rheological techniques for determining performance, coatability, and stability of magnetic dispersions.

Language Skills:
Foreign Language  


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