Nano Archive

Fluidic delivery of homogeneous solutions through carbon tube bundles

Srikar, R and Yarin, A L and Megaridis, C M (2009) Fluidic delivery of homogeneous solutions through carbon tube bundles. Nanotechnology, 20 (27). p. 275706.

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Official URL: http://stacks.iop.org/0957-4484/20/i=27/a=275706

Abstract

A wide array of technological applications requires localized high-rate delivery of dissolved compounds (in particular, biological ones), which can be achieved by forcing the solutions or suspensions of such compounds through nano or microtubes and their bundled assemblies. Using a water-soluble compound, the fluorescent dye Rhodamine 610 chloride, frequently used as a model drug release compound, it is shown that deposit buildup on the inner walls of the delivery channels and its adverse consequences pose a severe challenge to implementing pressure-driven long-term fluidic delivery through nano and microcapillaries, even in the case of such homogeneous solutions. Pressure-driven delivery (3–6 bar) of homogeneous dye solutions through macroscopically-long (~1 cm) carbon nano and microtubes with inner diameters in the range 100 nm–1 µm and their bundled parallel assemblies is studied experimentally and theoretically. It is shown that the flow delivery gradually shifts from fast convection-dominated (unobstructed) to slow jammed convection, and ultimately to diffusion-limited transport through a porous deposit. The jamming/clogging phenomena appear to be rather generic: they were observed in a wide concentration range for two fluorescent dyes in carbon nano and microtubes, as well as in comparable transparent glass microcapillaries. The aim of the present work is to study the physics of jamming, rather than the chemical reasons for the affinity of dye molecules to the tube walls.

Item Type:Article
ID Code:11345
Deposited By:Prof. Alexey Ivanov
Deposited On:02 Nov 2011 00:10
Last Modified:02 Nov 2011 00:47

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