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Research Abstracts Online
January 2009 - March 2010

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University of Minnesota Twin Cities
College of Food, Agricultural, and Natural Resource Sciences
Institute of Technology
Department of Bioproducts and Biosystems Engineering

PI: Shri Ramaswamy, Associate Fellow

Visualization and Characterization of Three-dimensional Bulk Structure of Porous Materials and Their Relationship to Transport Properties

This research is an attempt to visualize and characterize the three-dimensional bulk structure of paper and board using non-intrusive techniques. These researchers use x-ray micro computed tomography (x-ray CT) to visualize the structure of porous materials. The images are binarized in black and white and analyzed for pore structure characterization using MSI resources. Structural parameters of interest include pore size distribution, average pore diameter, porosity distribution and average porosity, tortuosity, available transfer surface area, and fiber-fiber bonded area. The group also uses MSI resources to sharpen the images as well as to obtain better characterizations of the structure. Results so far indicate an immense potential for this approach.

In addition, the researchers have developed a model to simulate the physics of simultaneous permeation and absorption of liquid in porous media. The results indicate that, in addition to inherent absorption characteristics of cellulose fibers, the rate of permeation through the pore space has a strong influence on the overall absorption by porous media. They are in the process of developing an MRI technique to visualize and characterize the transient three-dimensional structure of porous media during liquid penetration. Brownian motion random walk simulations to estimate transport properties of porous media using actual three-dimensional structures are underway.

Group Members

Yves Defrenne, Graduate Student
Huanjiang Huang, Research Associate
Sho Takagaki, Research Associate
Vasili Zhdankin, Graduate Student
Huigang Zuo, Graduate Student