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<div class="moz-cite-prefix"><font size="2">Caro senhor(a),</font>
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<div><font size="2">Peço a sua atenção para a divulgação dos
seminários abaixo, inseridos na <br>
iniciativa ENCONTROS COM A CIÊNCIA DO CIEPQPF.<br>
<br>
(Centro de Investigação em Engenharia dos Processos Químicos e
Produtos <br>
da Floresta, Dpto Engenharia Química, FCTUC)<br>
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<div><font face="Helvetica, Arial, sans-serif" size="2">-----------------------------------------------------------------------------------<br>
SEXTA SESSÃO DOS ENCONTROS COM A CIÊNCIA<br>
<img alt="" src="cid:part1.09080207.08000404@eq.uc.pt"
align="bottom" border="0" hspace="0"><br>
10 OUT 2012, 14h-15h30 <br>
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<p class="MsoNormal"><font face="Helvetica, Arial, sans-serif"
size="-1"><b><span style="" lang="EN-US">1. Recycling
agroindustrial by-products by composting technologies</span></b><b><span
style="" lang="EN-US"><br>
</span></b><span style="" lang="EN-US">Margarida J. Quina<br>
CIEPQPF, DEQ-FCTUC, Reaction, Separation and Environmental
Engineering Group (GERSE)<br>
</span></font></p>
<p class="MsoNormal"
style="line-height:150%;text-autospace:none"><font
face="Helvetica, Arial, sans-serif" size="-1"><span
style="line-height: 150%; color: black;" lang="EN-US">Composting
may be defined as the biological decomposition and
stabilization of organic subtracts, under aerobic and
thermophilic conditions, to obtain a final product that
can be beneficially applied to land as soil conditioner.
There are many agroindustrial by-products that can be
recycled by this technology, which can be used both at
small (domestic) or industrial scales. This presentation
will give an overview about the process technologies and
future trends, as well as some results from a case study.
</span><span style="" lang="EN-US"></span></font></p>
<font face="Helvetica, Arial, sans-serif" size="-1"><b>2. </b><b
style="mso-bidi-font-weight: normal"><span
style="mso-ansi-language:EN-GB" lang="EN-GB">Tailoring of
silica based aerogels for Space applications<o:p></o:p></span></b><br>
Luísa R. Durães<br>
<span style="" lang="EN-US">CIEPQPF, DEQ-FCTUC, </span>Computing,
Statistics & Materials Group (CEM)<br>
</font>
<p class="MsoNormal"
style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:
150%;mso-layout-grid-align:none;text-autospace:none"><font
face="Helvetica, Arial, sans-serif" size="-1"><span
style="line-height: 150%;" lang="EN-US">Tetra-alkoxysilane
precursors (Si(OR)<sub>4</sub>) are widely used to obtain
silica aerogels. These aerogels exhibit low density
(~100–350 kg/m<sup>3</sup>), high porosity (>90%) and
surface area, low thermal conductivity (~0.01–0.02 W/m K)
and high transparency (>90%). These properties make
them suitable for use as thermal or acoustic insulators,
optical materials, filters, catalysts, among others.
Despite these appealing properties, they are brittle,
absorb moisture and still have a relatively high density,
which might be a drawback for their performance in certain
applications, namely in Space insulation applications.
Using trialkoxysilanes (</span><span style="line-height:
150%;" lang="EN-US">R’-Si(OR)<sub>3</sub></span><span
style="line-height: 150%;" lang="EN-US">) as precursors in
a two-step acid-base catalyzed sol–gel chemistry, the
produced silica based aerogels can fulfill the targets for
Space applications. </span></font><font size="-1"><span
style="line-height: 150%; font-family: Arial;"
lang="EN-US"><font face="Helvetica, Arial, sans-serif">In
this work, the effect of changing of R’ and R groups
(methyl, ethyl or vinyl) on the aerogels density,
thermal conductivity, hydrophobicity and mechanical
strength will be presented, considering the
specifications for their use in Space.</font><o:p></o:p></span></font></p>
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<pre class="moz-signature" cols="72">Fernando Pedro Martins Bernardo
Assistant Professor
Department of Chemical Engineering
University of Coimbra
Pólo II - Rua Sílvio Lima
3030-790 Coimbra
Portugal
Tele: +351-239-798722
Fax: +351-239-798703
<a class="moz-txt-link-abbreviated" href="mailto:bernardo@eq.uc.pt">bernardo@eq.uc.pt</a>
<a class="moz-txt-link-abbreviated" href="http://www.eq.uc.pt/~bernardo">www.eq.uc.pt/~bernardo</a></pre>
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