Adsorbent new materials and composites produced in a single step

Corrosion resistant and adsorbent plasma polymerized thin film

“…For comparison purposes, HMDS deposition is also displayed. On this plasma chamber, flow stability is not severely affected by the flow ratio between auxiliary or principal inlet systems [33]. However, for the fluorinated ether, the secondary injection, in the auxiliary system, decreased the deposition rate, probably due to the reaction mechanism.…”

“…The films were deposited using a homemade DC planar reactor [33] and 15 min deposition time. This equipment allows the production of multiple layers and/or composites in a single step and a chamber schematic is shown in Fig.…”

The Use of Microchannels for Separation and Preconcentration: Comparison Between Three-Dimensional and Planar Configurations

“…Moreover, no meaningful difference was perceived between the two channels due to different machining process. Furthermore, HMDS thin film planarizes the surface during deposition (30) . Nonetheless, tests using propylene capillaries were also carried out to evaluate the relevance of non-uniformities on these surfaces, as explained later.…”

“…Roughness and channel profile were evaluated using secondary electron microscopy (SEM, NovaNanoSEM 400, FEI, USA). Furthermore, some of these microchannels were modified by plasma deposition of hexamethyldisilazane (HMDS) thin films (30) that easily adsorb organic compounds. The structures were tested in two different ways by using tracers and reactants in a wide range of polarity, respectively: tests and simulation used fluid flow rates up to 10 standard mL/min for gaseous samples an up to 1 mL/min for liquid ones.…”

“…In our former works, planar and three-dimensional channels were used as preconcentrators (26)(27)(28) and/or microchromatographic columns (29,30) . The planar channel is a spiral quite similar to those used in chromatographic columns; nonetheless retention occurred due to capillary effects because the flow was not completely laminar, or not ideal Hagen-Poiseuille flow, and some constrictions favored interactions with the wall (27) .…”