<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
  <channel>
    <title>Samuel R. Wolfe on MillironX</title>
    <link>http://localhost:1313/people/samuel-r.-wolfe/</link>
    <description>Recent content in Samuel R. Wolfe on MillironX</description>
    <generator>Hugo</generator>
    <language>en-us</language>
    <lastBuildDate>Mon, 29 Oct 2018 00:00:00 +0000</lastBuildDate>
    <atom:link href="http://localhost:1313/people/samuel-r.-wolfe/index.xml" rel="self" type="application/rss+xml" />
    <item>
      <title>Measuring Diffusion of Trichlorethylene Breakdown Products in Polyvinylalginate</title>
      <link>http://localhost:1313/academia/pva-aiche/</link>
      <pubDate>Mon, 29 Oct 2018 00:00:00 +0000</pubDate>
      <guid>http://localhost:1313/academia/pva-aiche/</guid>
      <description>&lt;p&gt;Trichloroethylene (TCE), a toxic and carcinogenic contaminant, presents unique&#xA;challenges for cleanup because of its water solubility, density, and volatility.&#xA;Bioremediation of TCE is a promising cleanup method; however, metabolism of TCE&#xA;results in acid generation that inhibits remediating microorganisms. Calcium&#xA;alginate(CA)-polyvinylalcohol (PVA) hydrogels show promise for protecting&#xA;remediating microbes, however diffusion of TCE or its byproducts through these&#xA;polymers is unknown. To measure the effective diffusion coefficient of TCE and&#xA;byproducts through hydrogel membranes, we used a modified diaphragm cell.&#xA;Measured effective diffusion coefficient of each species was (cm &lt;sup&gt;2&lt;/sup&gt;&#xA;/s&#xA;× 10&lt;sup&gt;6&lt;/sup&gt;&#xA;): 14.0 ± 1.91 for H&lt;sup&gt;&amp;#43;&lt;/sup&gt;&#xA; ions, 12.4 ± 1.64 for TCE,&#xA;7.83 ± 0.54 for cis-1,2-dichloroethylene (DCE), and 4.68 ± 4.14 for vinyl&#xA;chloride. These results aid in engineering biobeads and suggest that CA-PVA&#xA;hydrogel blends are effective in slowing diffusion of protons, buffering acids&#xA;produced by trichloroethylene metabolism, and remains suitable for encapsulation&#xA;of microorganisms involved in bioremediation.&lt;/p&gt;</description>
    </item>
  </channel>
</rss>
