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<p class=MsoNormal align=center style='text-align:center'><span
style='color:#1F497D'>***** Colloquium *****</span><span style='font-size:10.5pt;
font-family:Consolas'><o:p></o:p></span></p>
<p class=MsoNormal align=center style='text-align:center'><b><span
style='color:#1F497D'>Center for Integrated Bio and Nano Systems</span></b><span
style='font-size:10.5pt;font-family:Consolas'><o:p></o:p></span></p>
<p class=MsoNormal align=center style='text-align:center'><b><span
style='color:#1F497D'>Houston Chapter of IEEE Nanotechnology Council and
Houston Chapter of IEEE Magnetics Society</span></b><span style='font-size:
10.5pt;font-family:Consolas'><o:p></o:p></span></p>
<p class=MsoNormal align=center style='text-align:center'><span
style='color:#1F497D'>Friday,<span class=apple-converted-space> </span>April<span
class=apple-converted-space> 9</span>, 2010</span><span style='font-size:
10.5pt;font-family:Consolas'><o:p></o:p></span></p>
<p class=MsoNormal align=center style='text-align:center'><span
style='color:#1F497D'>12:30 p.m. (Refreshments served at noon)</span><span
style='font-size:10.5pt;font-family:Consolas'><o:p></o:p></span></p>
<p class=MsoNormal align=center style='text-align:center'><span
style='color:#1F497D'>Room: W122 Building D3</span><span style='font-size:10.5pt;
font-family:Consolas'><o:p></o:p></span></p>
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<p class=MsoNormal align=center style='text-align:center'><span
class=apple-style-span><b><span style='font-size:24.0pt;color:#1F497D'>Nanoporous
Metal Substrates: Electrochemical Processing and Surface Area Measurements</span></b></span><span
style='font-size:13.5pt;font-family:"Helvetica","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal align=center style='text-align:center'><span
style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal align=center style='margin-bottom:12.0pt;text-align:center'><span
class=apple-style-span><span style='font-size:18.0pt;color:#1F497D'>Nikolay
Dimitrov</span></span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal align=center style='text-align:center'><span
class=apple-style-span><i><span style='font-size:16.0pt;color:#1F497D'>Department
of Chemistry, SUNY at Binghamton</span></i></span><span style='font-size:
13.5pt;font-family:"Helvetica","sans-serif"'><o:p></o:p></span></p>
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style='font-size:13.5pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-align:justify'><span class=apple-style-span><span
style='font-size:11.5pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span></span><span
class=apple-style-span><span style='font-family:"Calibri","sans-serif";
color:#1F497D'>The electrochemical processing of nanoporous metals has been a
booming research field since the beginning of this century when a paper by J.
Erlebacher et al. published in Nature, 2001 made available to a wide scientific
audience understanding and skills associated with the fundamentals of
de-alloying. Many different systems including ideally miscible alloys like
Ag-Au, alloy systems with limited miscibility like brasses and even phase
separated metal mixtures like Ag-Ni have been subjected to various de-alloying
protocols all aimed at developing of nanoporous and high surface area metal
sponges consisting predominantly of the remaining after the selective
dissolution more noble alloy constituent. Great deal of the remarkable research
interest in the field of de-alloying could be attributed to the wide variety of
applications of the accordingly processed nanoporous metallic materials.
Specific examples here could be filtration membranes, surface coatings with
controlled roughness and controlled pore-size architectures that could
accommodate either catalytically active enzymes or metal nanoparticles specific
functionality. More recently nanoporous metallic structures have been eyed as
potential thermal interface materials.</span></span><span style='font-family:
"Calibri","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:13.5pt;font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-align:justify'><span class=apple-style-span><span
style='font-family:"Calibri","sans-serif";color:#1F497D'>This talk is aimed at
laying out the fundamentals of nanoporous materials
processing. De-alloying of single phase alloys and potential
controlled displacement are chosen to illustrate the similarity of final
products resulting from application of completely different experimental
approaches. The proposed presentation begins with introduction to de-alloying
fundamentals presented in view of experimental results and modeling approaches.
The concept of “<i>critical potential</i>” in the selective metal dissolution
is emphasized in this part. Arguments about the influence of a
pre-existing length-scale on the critical potential in systems subjected to
de-alloying are also considered. The presentation continues with an
introduction to the recently developed method of <i>potential controlled
displacement</i> that enables synthesis of nanoporous materials in phase
separated alloy systems where the standard de-alloying methodology is virtually
inapplicable. Here, a detailed analysis is proposed of the ratio of
dissolution to deposition current and its impact on the length-scale of
accordingly grown nanoporous material. The talk wraps up with an
introduction to the development of an in-situ method for surface area
measurements called “<i>Electrochemical BET</i>” and its validation illustrated
by a variety of means for tailoring of the porosity length-scale and
surface area, respectively. Arguments are provided for interpretation of the
impact of alloy composition, original structure, processing parameters and
thermal treatments on the resulting porosity length-scale. Conclusions
and ideas for future work encompass the current situation and lay out the most
immediate challenges in this field of research. </span></span><span
style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-align:justify'><span class=apple-style-span><b><span
style='font-family:"Calibri","sans-serif";color:#1F497D'> </span></b></span><span
style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
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<p class=MsoNormal><b><span style='font-family:"Calibri","sans-serif";
color:#1F497D'>Bio of Prof.<span class=apple-converted-space> </span>Dimitrov:</span></b><span
style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
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<p class=MsoNormal style='text-align:justify'><span style='font-family:"Calibri","sans-serif";
color:#1F497D'> </span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-align:justify'><span class=apple-style-span><span
style='font-family:"Calibri","sans-serif";color:#1F497D'>Nikolay Dimitrov
received his Ph.D. degree from Bulgarian Academy of Sciences, Sofia, Bulgaria
in 1993. He was postdoctoral researcher at Arizona State University (ASU)
1993-2000 and research assistant/associate professor from 2000-2003. In
2003 Dr. Dimitrov has joined the faculty of the Department of Chemistry at SUNY
– Binghamton, Binghamton, NY where he is presently an Associate Professor.
In 2008, Dr. Dimitrov has been awarded NSF career award.</span></span><span
style='font-size:13.5pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
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<p class=MsoNormal><span class=apple-style-span><span style='font-size:11.5pt;
font-family:"Calibri","sans-serif";color:#1F497D'> </span></span><span
style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Contact Prof. Stanko Brankovic (<a
href="mailto:stanko.brankovic@mail.uh.edu">stanko.brankovic@mail.uh.edu</a>) if
you would like to arrange for a time to meet with Prof. Dimitrov.</span><span
style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
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