Neha Borkar | University of Cincinnati (original) (raw)

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Papers by Neha Borkar

Research paper thumbnail of Characterization of porous materials using combined small-angle X-ray and neutron scattering techniques

Journal of Membrane Science, 2011

A combination of ultra small angle X-ray scattering (USAXS) and ultra small angle neutron scatter... more A combination of ultra small angle X-ray scattering (USAXS) and ultra small angle neutron scattering (USANS) is used to characterize porous materials. The analysis methods yield quantitative information, including the mean skeletal chord length, mean pore chord length, skeletal density, and composition. A mixed cellulose ester (MCE) membrane with a manufacturer-labeled pore size of 0.1 m was used as a model to elucidate the specifics of the method. Four approaches describing four specific scenarios (different known parameters and form of the scattering data) are compared. Pore chords determined using all four approaches are in good agreement with the scanning electron microscopy estimates but are larger than the manufacturer's nominal pore size. Our approach also gives the average chord of the skeletal solid (struts) of the membrane, which is also consistent for all four approaches. Combined data from USAXS and USANS gives the skeletal density and the strut composition.

Research paper thumbnail of Characterization of microporous membrane filters using scattering techniques

.........................................................................................ii ACKNO... more .........................................................................................ii ACKNOWLEDGEMENTS......................................................................iv LIST OF FIGURES.................................................................................vi LIST OF TABLES.................................................................................xii 1. CHAPTER 1: INTRODUCTION.........................................................1 a. Microfiltration membrane filters b. Characterization of microporous membrane filters 2. CHAPTER 2: CHARACTERIZATION TOOLS FOR MILLIPORE MEMBRANES..............................................................................4 a. Bubble point method b. Mercury porosimetry 3. CHAPTER 3: SCATTERING TECHNIQUES.........................................8 a. The basics of USAXS, USANS, and SLS b. Guinier and Porod region c. The basics of Scanning Electron Microscope 4. CHAPTER 4: SURFACE AREA ANALYSIS.......................................18 a. Methods for calculating the pore chords b. Scanning Electron Microscope data analysis 5. CHAPTER 5: MATERIALS............................................................22 a. Millipore MCE Membranes b. Millipore PVDF Membranes c. Whatman Anopore Membrane

Research paper thumbnail of Method of Coating a Composite Material and a Coated Edge of a Composite Structure

Research paper thumbnail of Characterization of porous materials using combined small-angle X-ray and neutron scattering techniques

Journal of Membrane Science, 2011

A combination of ultra small angle X-ray scattering (USAXS) and ultra small angle neutron scatter... more A combination of ultra small angle X-ray scattering (USAXS) and ultra small angle neutron scattering (USANS) is used to characterize porous materials. The analysis methods yield quantitative information, including the mean skeletal chord length, mean pore chord length, skeletal density, and composition. A mixed cellulose ester (MCE) membrane with a manufacturer-labeled pore size of 0.1 m was used as a model to elucidate the specifics of the method. Four approaches describing four specific scenarios (different known parameters and form of the scattering data) are compared. Pore chords determined using all four approaches are in good agreement with the scanning electron microscopy estimates but are larger than the manufacturer's nominal pore size. Our approach also gives the average chord of the skeletal solid (struts) of the membrane, which is also consistent for all four approaches. Combined data from USAXS and USANS gives the skeletal density and the strut composition.

Research paper thumbnail of Characterization of porous materials using combined small-angle X-ray and neutron scattering techniques

Journal of Membrane Science, 2011

A combination of ultra small angle X-ray scattering (USAXS) and ultra small angle neutron scatter... more A combination of ultra small angle X-ray scattering (USAXS) and ultra small angle neutron scattering (USANS) is used to characterize porous materials. The analysis methods yield quantitative information, including the mean skeletal chord length, mean pore chord length, skeletal density, and composition. A mixed cellulose ester (MCE) membrane with a manufacturer-labeled pore size of 0.1 m was used as a model to elucidate the specifics of the method. Four approaches describing four specific scenarios (different known parameters and form of the scattering data) are compared. Pore chords determined using all four approaches are in good agreement with the scanning electron microscopy estimates but are larger than the manufacturer's nominal pore size. Our approach also gives the average chord of the skeletal solid (struts) of the membrane, which is also consistent for all four approaches. Combined data from USAXS and USANS gives the skeletal density and the strut composition.

Research paper thumbnail of Characterization of microporous membrane filters using scattering techniques

.........................................................................................ii ACKNO... more .........................................................................................ii ACKNOWLEDGEMENTS......................................................................iv LIST OF FIGURES.................................................................................vi LIST OF TABLES.................................................................................xii 1. CHAPTER 1: INTRODUCTION.........................................................1 a. Microfiltration membrane filters b. Characterization of microporous membrane filters 2. CHAPTER 2: CHARACTERIZATION TOOLS FOR MILLIPORE MEMBRANES..............................................................................4 a. Bubble point method b. Mercury porosimetry 3. CHAPTER 3: SCATTERING TECHNIQUES.........................................8 a. The basics of USAXS, USANS, and SLS b. Guinier and Porod region c. The basics of Scanning Electron Microscope 4. CHAPTER 4: SURFACE AREA ANALYSIS.......................................18 a. Methods for calculating the pore chords b. Scanning Electron Microscope data analysis 5. CHAPTER 5: MATERIALS............................................................22 a. Millipore MCE Membranes b. Millipore PVDF Membranes c. Whatman Anopore Membrane

Research paper thumbnail of Method of Coating a Composite Material and a Coated Edge of a Composite Structure

Research paper thumbnail of Characterization of porous materials using combined small-angle X-ray and neutron scattering techniques

Journal of Membrane Science, 2011

A combination of ultra small angle X-ray scattering (USAXS) and ultra small angle neutron scatter... more A combination of ultra small angle X-ray scattering (USAXS) and ultra small angle neutron scattering (USANS) is used to characterize porous materials. The analysis methods yield quantitative information, including the mean skeletal chord length, mean pore chord length, skeletal density, and composition. A mixed cellulose ester (MCE) membrane with a manufacturer-labeled pore size of 0.1 m was used as a model to elucidate the specifics of the method. Four approaches describing four specific scenarios (different known parameters and form of the scattering data) are compared. Pore chords determined using all four approaches are in good agreement with the scanning electron microscopy estimates but are larger than the manufacturer's nominal pore size. Our approach also gives the average chord of the skeletal solid (struts) of the membrane, which is also consistent for all four approaches. Combined data from USAXS and USANS gives the skeletal density and the strut composition.

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