| Revue: | Materials research |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000312920 |
| ISSN: | 1516-1439 |
| Autores: | Nascimento-Filho, Antonio Pereira1 Carvalho, Alexsander Tressino de Silva, Maria Lucia Pereira da Demarquette, Nicole Raymond |
| Instituciones: | 1Universidade de Sao Paulo, Escola Politecnica, Sao Paulo. Brasil |
| Año: | 2006 |
| Periodo: | Ene-Mar |
| Volumen: | 9 |
| Número: | 1 |
| Paginación: | 33-40 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Experimental |
| Resumen en inglés | The possibility of preconcentration on microchannels for organic compounds in gas or liquid phases was evaluated. Microstructures with different geometries were mechanically machined using poly(methyl methacrylate) - PMMA as substrates and some cavities were covered with cellulose. The surfaces of the microchannels were modified by plasma deposition of hydrophilic or hydrophobic films using 2-propanol and hexamethyldisilazane (HMDS), respectively. Double layers of HMDS + 2-propanol were also used. Adsorption characterization was made by Quartz Crystal Measurements (QCM) technique using reactants in a large polarity range that showed the adsorption ability of the structures depends more on the films used than on the capillary phenomena. Cellulose modified by double layer film showed a high retention capacity for all gaseous compounds tested. However, structures without plasma deposition showed low retention capacity. Microchannels modified with double layers or 2-propanol plasma films showed higher retention than non-modified ones on gas or liquid phase |
| Disciplinas: | Química, Física y astronomía, Ingeniería |
| Palabras clave: | Química de polímeros, Física de materia condensada, Ingeniería de materiales, Películas delgadas, Microestructuras, Propiedades fisicoquímicas |
| Keyword: | Chemistry, Physics and astronomy, Engineering, Polymer chemistry, Condensed matter physics, Materials engineering, Thin films, Microstructures, Physicochemical properties |
| Texte intégral: | Texto completo (Ver HTML) |
