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Search Publications by: Joy Dunkers (Fed)

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Displaying 51 - 75 of 98

Permeability of Polymeric Scaffolds With Defined Pore Micro-Architecture and Interconnectivity Fabricated by Solid Free-Form Microprinting

November 7, 2004
Author(s)
K W. Lee, E Jabbari, L L. Lu, B L. Currier, Joy Dunkers, Martin Chiang, John A. Tesk, Marcus T. Cicerone, M J. Yaszemski
The hydraulic permeability of was measured as a function of interconnectivity of the pores. The hydraulic permeability of porous scaffolds for tissue engineering of bone was measured as interconnectivity of the pores was changed from 100 % to 70 %. The

Optical Coherence Microscopy for in-situ Monitoring of Cell Growth in Scaffold Constructs

May 1, 2004
Author(s)
Marcus T. Cicerone, Joy Dunkers, N. R. Washburn, Forrest A. Landis, James A. Cooper
Tissue scaffold morphological properties are determined and correlated with osteoblast proliferation and ingrowth. Scaffold pore size and connectivity were characterized with x-ray tomography. Cell proliferation and ingrowth were measured with confocal

Glass-Fiber/Resin Interfacial Strength the Microbond Test and Chemical Evaluation

January 1, 2003
Author(s)
Walter G. McDonough, Joseph M. Antonucci, Joy Dunkers, Gary E. Schumacher
The quest for durable, aesthetic and bondable materials that can restore both the function and appearance of lost tooth structure has been a major concern for dental materials researchers. A significant advance, which ushered in the modern era of

Using a Localized Fluorescent Dye to Probe the Glass/Resin Interphase

August 1, 2002
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, J H. VanZanten, Joy Dunkers, Richard~undefined~undefined~undefined~undefined~undefined Parnas
A novel technique has been developed to study the chemistry of buried polymer substrate interfacial regions by localizing a fluorescent probe to the substrate surface. Epoxy functional multi-layers of silane coupling agents were deposited on glass and

Influence of Processing Rate and Formulation on the Interface Strength of Vinyl Ester/E-Glass Composites

April 1, 2002
Author(s)
Walter G. McDonough, Joy Dunkers, Gale A. Holmes, E Feresenbet, Y H. Kim, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The single fiber fragmentation test was used to investigate the effect of gelation time on interfacial shear properties of fast reacting resin systems. We developed a processing system capable of producing single fiber fragmentation samples with gelation

Comparison of Optical Coherence Tomography, X-Ray Computed Tomography, and Confocal Microscopy Results From an Impact Damaged Epoxy/E-Glass Composite

January 1, 2002
Author(s)
Joy Dunkers, D P. Sanders, Donald L. Hunston, M J. Everett, William H. Green
Optical coherence tomography (OCT) is an emerging technique for imaging of synthetic materials. OCT is attractive because of the combination of its high sensitivity (>90 dB), high resolution ((10-20) mm), and low cost ($75 k). The value of any new

The Prediction of Permeability for an Epoxy/E-Glass Composite Using Optical Coherence Tomographic Images

December 1, 2001
Author(s)
Joy Dunkers, Frederick R. Phelan Jr., C G. Zimba, Kathleen M. Flynn, D P. Sanders, R C. Peterson, Richard~undefined~undefined~undefined~undefined~undefined Parnas
Knowledge of the permeability tensor in liquid composite molding is important for process optimization. Unfortunately, experimental determination of permeability is difficult and time consuming. A rapid, non-destructive technique called optical coherence

Interfacial Shear Strengths of Dental Resin-Glass Fibers by the Microbond Test

November 1, 2001
Author(s)
Walter G. McDonough, Joseph M. Antonucci, Joy Dunkers
In this study, the feasibility of using the microbond test (MBT) to probe the durability of the bond between a dental resin with differently silanized E-glass fibers was investigated. The E-glass fibers were silanized with equivalent amounts of two types

Permeability Prediction From Non-Destructive Imaging of Composite Microstructure

May 1, 2001
Author(s)
Joy Dunkers, Frederick R. Phelan Jr., Kathleen M. Flynn, D P. Sanders, Richard~undefined~undefined~undefined~undefined~undefined Parnas
In this work, binary images of the microstructure of a unidirectional E-glass/epoxy composite were generated from the low contrast OCT data through image de-noising, contrast enhancement and feature recognition. The resulting data were input to a lattice