| PAPER SURFACE SCIENCE PROGRAM |
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CURRENT PROJECTS SPRING-2004 Short Time Leveling of Shear Thinning Fluids Objective: To model and characterize the leveling of defects on porous surfaces. Approach: Develop a shadow technique to characterize the leveling rate of fluids. Extend leveling models to include shear thinning and absorption effects. Student: Jae Young Shin Advisor: Doug Bousfield Pressure Distribution and Transfer in Rolling Nips Objective: To understand the fluid dynamics in a rolling nip during coating onto a porous web. Approach: Use rolling nip device to record pressure profiles, film thicknesses, loading, and roll positions to compare with theoretical models dealing with the transfer of fluids in these nips. Student: Suresh Devisetti Advisor: Doug Bousfield Paper Properties that Influence Ink Penetration into Uncoated Grades Objective: To determine the important paper properties that influence ink pigment penetration. Approach: Modify paper properties such as pore size and surface chemistry. Print samples. Characterize ink penetration. Visiting Scientist: Takehide Kasamara Advisor: Doug Bousfield Mechanical Properties of Coated Papers Objective: To predict the mechanical properties of coated papers. Approach: Characterize the properties of base papers, pure latex and latex-pigment systems with various tools. Use these to generate input parameters of a model. Predict the mechanical properties of the actual coated sheets. Student: Robert Rioux Advisors: Doug Bousfield, Bill Unertl Confocal Laser Scanning Microscope to characterize ink Penetration Objective: To develop techniques to use the CLSM to characterize ink penetration Approach: Look at different dyes to mix into ink formulations to tag vehicle and cellulose. Visiting Scientist: Yasushi Ozaki Advisors: Steve Shaler, Doug Bousfield Coating Pigment Surface Modification to influence coating structure Objective: Characterize the importance of surface chemistry on coating structure and ink setting. Approach: Modify surface of pigments in coating layer with various techniques. Measure final coating properties. Student: Gu Wei Advisors: Carl Tripp Influence of Ink and Coating Properties on Dot Gain Objective: Understand the parameters that influence dot gain, especially for FM screens Approach: Single dot gain with controlled loads and laboratory print tests will be compared to a model of the process. Student: John Teft Advisors: Doug Bousfield Polyelectrolyte/Surfactant Migration on Oxide Surfaces Objective: To study the migration of polyelectrolytes and surfactants between pigment surfaces. Approach: The adsorption and competitive dynamics of polymers and surfactants on metal oxide pigments will be characterized using Attenuated Total Reflectance-Infrared Spectroscopy techniques . Powders of TiO2 will be deposited on ZnSe crystals. A colloidal suspension containing pigments such as silica, kaolin or CaCO3 and surfactants/polyelectrolytes will be passed over the crystal. The transfer of surfactant and polyelectrolyte from one pigment to the other will be measured as a function of pH, ionic strength, and temperature . Student: Haiyan Li Advisor: C. Tripp and D. Bousfield Ink Tack and Its Dependence on the Physico-Chemical Properties of Coating Papers Objective: To measure local ink tack variation and relate to the physico-chemical properties of coated papers Approach: Develop a method to measure the tack buildup of ink on a small scale. Measure papers with different degrees of mottle. Characterize these papers in terms of physical and chemical properties. Investigator: Edgardo Schwiderke with D.W. Bousfield MICRO-PROBE FOR PAPER SURFACE ANALYSIS Objective: To characterize variations in the paper surface at a fine lengthscale . Approach: Contact fluids on a fine probe tip and measure force-time response. Develop xyz stage to apply fluid and test at various points in a sample. Relate to variations in printing properties. Student: Yingfeng Shen (MS) Advisors: Doug Bousfield and A. van Heiningen |
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