TY - GEN
T1 - Visualization and characterization of 3D structure of Fibrous porous bio-based materials, and their relationship to properties and performance
AU - Ramanna, Sahana
AU - Defrenne, Yves
AU - Zhdankin, Vasa
AU - Ramarao, Bandaru V.
AU - Pande, Harshad
AU - Ramaswamy, Shri
PY - 2017
Y1 - 2017
N2 - Fibrous materials such as paper, board, and bio-based composites have complex 3-D internal structures. X-ray computed tomography (XRCT) at the micron and sub-micron scale is a viable technique for visualizing and characterizing the internal three dimensional structures of fibrous materials. XRCT can be used as a non-invasive method to determine the pore structure characteristics including porosity, fiber-pore interfacial surface area, pore size distribution and tortuosity in three dimensions. Comparison of the 3D pore size distributions between handsheets prepared under different conditions showed that as the degree of mechanical refining of fibers is increased, the pore sizes decrease along with a narrowing of the distributions. The effects of fiber species and papermaking process variables such as wet-pressing on the 3D internal structure are also shown. Comparison with conventional techniques shows the advantages of the XRCT based structural characterization. In addition, methods to determine the vapor, liquid transport and mechanical properties of paper and board using actual 3D structures show the versatility and wide ranging applications of this technique. While structure plays a significant role in affecting moisture transport resulting in anisotropic behavior, interestingly, above a certain value for fiber space conductivity, porous materials, which are initially anisotropic, behave more like an isotropic material.
AB - Fibrous materials such as paper, board, and bio-based composites have complex 3-D internal structures. X-ray computed tomography (XRCT) at the micron and sub-micron scale is a viable technique for visualizing and characterizing the internal three dimensional structures of fibrous materials. XRCT can be used as a non-invasive method to determine the pore structure characteristics including porosity, fiber-pore interfacial surface area, pore size distribution and tortuosity in three dimensions. Comparison of the 3D pore size distributions between handsheets prepared under different conditions showed that as the degree of mechanical refining of fibers is increased, the pore sizes decrease along with a narrowing of the distributions. The effects of fiber species and papermaking process variables such as wet-pressing on the 3D internal structure are also shown. Comparison with conventional techniques shows the advantages of the XRCT based structural characterization. In addition, methods to determine the vapor, liquid transport and mechanical properties of paper and board using actual 3D structures show the versatility and wide ranging applications of this technique. While structure plays a significant role in affecting moisture transport resulting in anisotropic behavior, interestingly, above a certain value for fiber space conductivity, porous materials, which are initially anisotropic, behave more like an isotropic material.
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M3 - Conference contribution
AN - SCOPUS:85041544990
T3 - Paper Conference and Trade Show, PaperCon 2017: Renew, Rethink, Redefine the Future
SP - 906
EP - 911
BT - Paper Conference and Trade Show, PaperCon 2017
PB - TAPPI Press
T2 - Paper Conference and Trade Show: Renew, Rethink, Redefine the Future, PaperCon 2017
Y2 - 23 April 2017 through 26 April 2017
ER -