ORCID Profile
0000-0001-7398-0335
Current Organisation
Politecnico di Milano
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Publisher: American Physical Society (APS)
Date: 02-04-2007
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2SM25061F
Publisher: American Chemical Society (ACS)
Date: 10-02-2010
DOI: 10.1021/LA904588S
Abstract: In electrolyte solutions, the differential migration of the ionic species induced by the presence of a thermal gradient leads to the buildup of a steady-state electric field. Similarly to what happens for the Seebeck effect in solids, the s le behaves therefore as a thermocell. Here, we provide clear evidence for the presence of thermoelectric fields in liquids by detecting and quantifying their strong effects on colloid thermophoresis. Specifically, by contrasting the effects of the addition of NaCl or NaOH on the Soret effect of micellar solutions of sodium dodecyl sulfate, we show that the presence of highly thermally responsive ions such as OH(-) may easily lead to the reversal of particle motion. Our experimental results can be quantitatively explained by a simple model that takes into account interparticle interactions and explicitly includes the micellar electrophoretic transport driven by such a thermally generated electric field. The chance of carefully controlling colloid thermophoresis by tuning the solvent electrolyte composition may prove to be very useful in microfluidic applications and field-flow fractionation methods.
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B919146A
Abstract: For many physical, chemical and biological measurements, temperature is a crucial parameter to control. In particular, the recent development of microreactors and chip-based technologies requires integrated thermostatic systems. However, the requirements of disposability and visual inspection of a device under a microscope cannot accommodate equipment such as external heaters. By exploiting a silver-filled epoxy that can be injected and solidified in a microfluidic chip, we demonstrate a simple and inexpensive design of a conductive path, which allows heating by the Joule effect of both sides of a microchannel. In addition to permitting the maintenance of a constant temperature along the channel walls, our method can control the temperature gradient across the channel, thus enabling non-equilibrium studies in a microfluidic geometry.
Publisher: American Physical Society (APS)
Date: 12-03-2008
Publisher: IOP Publishing
Date: 12-11-2008
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C002057E
No related grants have been discovered for Roberto Piazza.