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RISS 인기검색어
- 검색키워드
- 저자 : Grunlan, Jaime C. (검색결과 3 건)
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Yu, Choongho,Choi, Kyungwho,Yin, Liang,Grunlan, Jaime C. American Chemical Society 2011 ACS NANO Vol.5 No.10
<P>Typical organic materials have low thermal conductivities that are best suited to thermoelectrics, but their poor electrical properties with strong adverse correlations have prevented them from being feasible candidates. Our composites, containing single-wall carbon nanotubes, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) and/or polyvinyl acetate, show thermopowers weakly correlated with electrical conductivities, resulting in large thermoelectric power factors in the in-plane direction of the composites, ∼160 μW/m·K<SUP>2</SUP> at room temperature, which are orders of magnitude larger than those of typical polymer composites. Furthermore, their high electrical conductivities, ∼10<SUP>5</SUP> S/m at room temperature, make our composites very promising for various electronic applications. The optimum nanotube concentrations for better power factors were identified to be 60 wt % with 40 wt % polymers. It was noticed that high nanotube concentrations above 60 wt % decreased the electrical conductivity of the composites due to less effective nanotube dispersions. The thermal conductivities of our 60 wt % nanotube composites in the out-of-plane direction were measured to be 0.2–0.4 W/m·K at room temperature. The in-plane thermal conductivity and thermal contact conductance between nanotubes were also theoretically estimated.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2011/ancac3.2011.5.issue-10/nn202868a/production/images/medium/nn-2011-02868a_0006.gif'></P>
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Nanotube Friendly Poly(N-isopropylacrylamide)
Etika, Krishna C.,Jochum, Florian D.,Cox, Michael A.,Schattling, Philipp,Theato, Patrick,Grunlan, Jaime C. WILEY-VCH Verlag 2010 Macromolecular Rapid Communications Vol.31 No.15
<P>Poly(N-ispropylacrylamide) [PNIPAM] is a widely studied polymer for use in biological applications due to its lower critical solution temperature (LCST) being so close to the human body temperature. Unfortunately, attempts to combine carbon nanotubes (CNTs) with PNIPAM have been unsuccessful due to poor interactions between these two materials. In this work, a PNIPAM copolymer with 1 mol-% pyrene side group [p-PNIPAM] was used to produce a thermoresponsive polymer capable of stabilizing both single and multi-walled carbon nanotubes (MWNTs) in water. The presence of pyrene in the polymer chain lowers the LCST less than 4 °C and the interaction with nanotubes does not show any influence on LCST. Moreover, p-PNIPAM stabilized nanotubes show a temperature-dependent dispersion in water that allows the level of nanotube exfoliation/bundling to be controlled. Cryo-TEM images, turbidity, and viscosity of these suspensions were used to characterize these thermoresponsive changes. This ability to manipulate the dispersion state of CNTs in water with p-PNIPAM will likely benefit many biological applications, such as drug delivery, optical sensors, and hydrogels.</P><P> <img src='wiley_img_2010/10221336-2010-31-15-MARC201000170-gra001.gif' alt='wiley_img_2010/10221336-2010-31-15-MARC201000170-gra001'> </P> <B>Graphic Abstract</B> <P>Schematic of SWNT dispersion and bundling using thermoresponsive 1 mol-% pyrene functionalized poly(N-isopropyl acrylamide). At temperatures below the LCST, the polymer is soluble in water and assumes a more extended conformation, thereby providing steric hindrance for nanotube bundling. At higher temperatures, p-PNIPAM assumes a globular conformation resulting in decreased hindrance that results in nanotube bundling/networking. <img src='wiley_img_2010/10221336-2010-31-15-MARC201000170-content.gif' alt='wiley_img_2010/10221336-2010-31-15-MARC201000170-content'> </P>
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