<?xml version="1.0" encoding="utf-8" standalone="yes"?><feed xmlns="http://www.w3.org/2005/Atom"><generator uri="https://gohugo.io" version="0.141.0">Hugo v0.141.0</generator><id>https://millironx.millironx.page/@indiewebpub/people/samuel-r.-wolfe/</id><link rel="self" type="application/atom+xml" href="https://millironx.millironx.page/@indiewebpub/people/samuel-r.-wolfe/feed.xml"/><link rel="alternate" type="text/html" href="https://millironx.millironx.page/@indiewebpub/people/samuel-r.-wolfe/"/><updated>2025-03-31T00:14:19+00:00</updated><title>Samuel R. Wolfe's activity on Milliron X</title><entry><id>https://millironx.millironx.page/@indiewebpub/academia/pva-aiche/</id><link rel="alternate" href="/academia/pva-aiche/measuring_diffusion_of_trichloroethylene.pdf"/><title>Measuring Diffusion of Trichlorethylene Breakdown Products in Polyvinylalginate</title><published>2018-10-29T00:00:00+00:00</published><updated>2018-10-29T00:00:00+00:00</updated><author><name>Thomas A. Christensen II</name><uri>https://millironx.millironx.page/@indiewebpub/people/thomas-a.-christensen-ii/</uri></author><author><name>Samuel R. Wolfe</name><uri>https://millironx.millironx.page/@indiewebpub/people/samuel-r.-wolfe/</uri></author><author><name>Jonathan Counts</name><uri>https://millironx.millironx.page/@indiewebpub/people/jonathan-counts/</uri></author><author><name>Mark F. Roll</name><uri>https://millironx.millironx.page/@indiewebpub/people/mark-f.-roll/</uri></author><author><name>Kristopher v. Waynant</name><uri>https://millironx.millironx.page/@indiewebpub/people/kristopher-v.-waynant/</uri></author><author><name>James G. Moberly</name><uri>https://millironx.millironx.page/@indiewebpub/people/james-g.-moberly/</uri></author><category term="poster"/><category term="bioremediation"/><category term="polyoxometalate"/><category term="hydrogel polymers"/><category term="proton transport"/><category term="chemical engineering"/><summary type="text">
Trichloroethylene (TCE), a toxic and carcinogenic contaminant, presents unique challenges for cleanup because of its water solubility, density, and volatility. Bioremediation of TCE is a promising cleanup method; however, metabolism of TCE results in acid generation that inhibits remediating microorganisms. Calcium alginate(CA)-polyvinylalcohol (PVA) hydrogels show promise for protecting remediating microbes, however diffusion of TCE or its byproducts through these polymers is unknown. To measure the effective diffusion coefficient of TCE and byproducts through hydrogel membranes, we used a modified diaphragm cell. Measured effective diffusion coefficient of each species was (cm 2 /s × 106 ): 14.0 ± 1.91 for H+ ions, 12.4 ± 1.64 for TCE, 7.83 ± 0.54 for cis-1,2-dichloroethylene (DCE), and 4.68 ± 4.14 for vinyl chloride. These results aid in engineering biobeads and suggest that CA-PVA hydrogel blends are effective in slowing diffusion of protons, buffering acids produced by trichloroethylene metabolism, and remains suitable for encapsulation of microorganisms involved in bioremediation.</summary><content type="html" xml:lang="en" xml:base="https://millironx.millironx.page/@indiewebpub/">
&lt;p>Trichloroethylene (TCE), a toxic and carcinogenic contaminant, presents unique
challenges for cleanup because of its water solubility, density, and volatility.
Bioremediation of TCE is a promising cleanup method; however, metabolism of TCE
results in acid generation that inhibits remediating microorganisms. Calcium
alginate(CA)-polyvinylalcohol (PVA) hydrogels show promise for protecting
remediating microbes, however diffusion of TCE or its byproducts through these
polymers is unknown. To measure the effective diffusion coefficient of TCE and
byproducts through hydrogel membranes, we used a modified diaphragm cell.
Measured effective diffusion coefficient of each species was (cm &lt;sup>2&lt;/sup>
/s
× 10&lt;sup>6&lt;/sup>
): 14.0 ± 1.91 for H&lt;sup>&amp;#43;&lt;/sup>
 ions, 12.4 ± 1.64 for TCE,
7.83 ± 0.54 for cis-1,2-dichloroethylene (DCE), and 4.68 ± 4.14 for vinyl
chloride. These results aid in engineering biobeads and suggest that CA-PVA
hydrogel blends are effective in slowing diffusion of protons, buffering acids
produced by trichloroethylene metabolism, and remains suitable for encapsulation
of microorganisms involved in bioremediation.&lt;/p>
</content></entry></feed>