Fluidic delivery of homogeneous solutions through carbon tube bundles

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 com...

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Bibliographic Details
Published in:Nanotechnology 2009-07, Vol.20 (27), p.275706-275706
Main Authors: Srikar, R, Yarin, A L, Megaridis, C M
Format: Article
Language:English
Subjects:
Chemical Phenomena
Equipment Design
Microfluidics - methods
Microscopy, Electron, Transmission
Nanotubes, Carbon - chemistry
Nanotubes, Carbon - ultrastructure
Polyacetylenes - chemistry
Polymers - chemistry
Polymethyl Methacrylate - chemistry
Rhodamines - chemistry
Solutions - chemistry
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Summary: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 (approximately 1 cm) carbon nano and microtubes with inner diameters in the range 100 nm-1 microm 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.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/20/27/275706