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Grattoni A, Gill J, Zabre E, Fine D, Hussain F, Ferrari M. Device for Rapid and Agile Measurement of Diffusivity in Micro- and Nanochannels. Anal Chem 2011; 83:3096-103. [DOI: 10.1021/ac1033648] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alessandro Grattoni
- The University of Texas Health Science Center at Houston, 1825 Pressler Street Suite 537A, Houston, Texas, 77030, United States
- Department of Nanomedicine, Methodist Hospital Research Institute, 6670 Bertner Avenue, Houston, Texas 77030, United States
| | - Jaskaran Gill
- The University of Texas Health Science Center at Houston, 1825 Pressler Street Suite 537A, Houston, Texas, 77030, United States
- Department of Nanomedicine, Methodist Hospital Research Institute, 6670 Bertner Avenue, Houston, Texas 77030, United States
| | - Erika Zabre
- The University of Texas Health Science Center at Houston, 1825 Pressler Street Suite 537A, Houston, Texas, 77030, United States
- Department of Nanomedicine, Methodist Hospital Research Institute, 6670 Bertner Avenue, Houston, Texas 77030, United States
| | - Daniel Fine
- The University of Texas Health Science Center at Houston, 1825 Pressler Street Suite 537A, Houston, Texas, 77030, United States
- Department of Nanomedicine, Methodist Hospital Research Institute, 6670 Bertner Avenue, Houston, Texas 77030, United States
| | - Fazle Hussain
- The University of Texas Health Science Center at Houston, 1825 Pressler Street Suite 537A, Houston, Texas, 77030, United States
| | - Mauro Ferrari
- The University of Texas Health Science Center at Houston, 1825 Pressler Street Suite 537A, Houston, Texas, 77030, United States
- Department of Nanomedicine, Methodist Hospital Research Institute, 6670 Bertner Avenue, Houston, Texas 77030, United States
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Pappaert K, Biesemans J, Clicq D, Vankrunkelsven S, Desmet G. Measurements of diffusion coefficients in 1-D micro- and nanochannels using shear-driven flows. LAB ON A CHIP 2005; 5:1104-10. [PMID: 16175267 DOI: 10.1039/b505122c] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The present paper describes a method for measuring the molecular diffusion coefficient of fluorescent molecules in microfluidic systems. The proposed static shear-driven flow method allows one to perform diffusion measurements in a fast and accurate manner. The method also allows one to work in very thin (i.e. submicron) channels, hence allowing the investigation of diffusion in highly confined spaces. In the deepest investigated channels, the obtained results were comparable to the existing literature values, but when the channel size dropped below the micrometer range, a significant decrease (more than 30%) in molecular diffusivity was observed. The reduction of the diffusivity was most significant for the largest considered molecules (ssDNA oligomers with a size ranging between 25 to 100 bases), but the decrease was also observed for smaller tracer molecules (FITC). This decrease can be attributed to the interactions of the analyte molecules with the channel walls, which can no longer be neglected when the depth of the channel reaches a critical value. The change in diffusivity seems to become more explicit as the molecular weight of the analytes increases.
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Affiliation(s)
- Kris Pappaert
- Vrije Universiteit Brussel, Department of Chemical Engineering Pleinlaan 2, 1050, Brussels, Belgium.
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