Mass transport through vertically aligned large diameter MWCNTs embedded in parylene

P. Krishnakumar, P. B. Tiwari, S. Staples, T. Luo, Y. Darici, J. He, Stuart Lindsay

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We have fabricated porous membranes using a parylene encapsulated vertically aligned forest of multi-walled carbon nanotubes (MWCNTs, about 7nm inner diameter). The transport of charged particles in electrolyte through these membranes was studied by applying electric field and pressure. Under an electric field in the range of 4.4×10 4Vm 1, electrophoresis instead of electroomosis is found to be the main mechanism for ion transport. Small molecules and 5nm gold nanoparticles can be driven through the membranes by an electric field. However, small biomolecules, like DNA oligomers, cannot. Due to the weak electric driving force, the interactions between charged particles and the hydrophobic CNT inner surface play important roles in the transport, leading to enhanced selectivity for small molecules. Simple chemical modification on the CNT ends also induces an obvious effect on the translocation of single strand DNA oligomers and gold nanoparticles under a modest pressure (<294Pa).

Original languageEnglish (US)
Article number455101
JournalNanotechnology
Volume23
Issue number45
DOIs
StatePublished - Nov 16 2012

Fingerprint

Mass transfer
Electric fields
Charged particles
Membranes
Oligomers
Gold
DNA
Nanoparticles
Carbon Nanotubes
Molecules
Chemical modification
Biomolecules
Electrophoresis
Electrolytes
Carbon nanotubes
Ions
parylene

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Mass transport through vertically aligned large diameter MWCNTs embedded in parylene. / Krishnakumar, P.; Tiwari, P. B.; Staples, S.; Luo, T.; Darici, Y.; He, J.; Lindsay, Stuart.

In: Nanotechnology, Vol. 23, No. 45, 455101, 16.11.2012.

Research output: Contribution to journalArticle

Krishnakumar P, Tiwari PB, Staples S, Luo T, Darici Y, He J et al. Mass transport through vertically aligned large diameter MWCNTs embedded in parylene. Nanotechnology. 2012 Nov 16;23(45). 455101. https://doi.org/10.1088/0957-4484/23/45/455101
Krishnakumar, P. ; Tiwari, P. B. ; Staples, S. ; Luo, T. ; Darici, Y. ; He, J. ; Lindsay, Stuart. / Mass transport through vertically aligned large diameter MWCNTs embedded in parylene. In: Nanotechnology. 2012 ; Vol. 23, No. 45.
@article{972c8c53981f45c2a388d5cf1c2612dc,
title = "Mass transport through vertically aligned large diameter MWCNTs embedded in parylene",
abstract = "We have fabricated porous membranes using a parylene encapsulated vertically aligned forest of multi-walled carbon nanotubes (MWCNTs, about 7nm inner diameter). The transport of charged particles in electrolyte through these membranes was studied by applying electric field and pressure. Under an electric field in the range of 4.4×10 4Vm 1, electrophoresis instead of electroomosis is found to be the main mechanism for ion transport. Small molecules and 5nm gold nanoparticles can be driven through the membranes by an electric field. However, small biomolecules, like DNA oligomers, cannot. Due to the weak electric driving force, the interactions between charged particles and the hydrophobic CNT inner surface play important roles in the transport, leading to enhanced selectivity for small molecules. Simple chemical modification on the CNT ends also induces an obvious effect on the translocation of single strand DNA oligomers and gold nanoparticles under a modest pressure (<294Pa).",
author = "P. Krishnakumar and Tiwari, {P. B.} and S. Staples and T. Luo and Y. Darici and J. He and Stuart Lindsay",
year = "2012",
month = "11",
day = "16",
doi = "10.1088/0957-4484/23/45/455101",
language = "English (US)",
volume = "23",
journal = "Nanotechnology",
issn = "0957-4484",
publisher = "IOP Publishing Ltd.",
number = "45",

}

TY - JOUR

T1 - Mass transport through vertically aligned large diameter MWCNTs embedded in parylene

AU - Krishnakumar, P.

AU - Tiwari, P. B.

AU - Staples, S.

AU - Luo, T.

AU - Darici, Y.

AU - He, J.

AU - Lindsay, Stuart

PY - 2012/11/16

Y1 - 2012/11/16

N2 - We have fabricated porous membranes using a parylene encapsulated vertically aligned forest of multi-walled carbon nanotubes (MWCNTs, about 7nm inner diameter). The transport of charged particles in electrolyte through these membranes was studied by applying electric field and pressure. Under an electric field in the range of 4.4×10 4Vm 1, electrophoresis instead of electroomosis is found to be the main mechanism for ion transport. Small molecules and 5nm gold nanoparticles can be driven through the membranes by an electric field. However, small biomolecules, like DNA oligomers, cannot. Due to the weak electric driving force, the interactions between charged particles and the hydrophobic CNT inner surface play important roles in the transport, leading to enhanced selectivity for small molecules. Simple chemical modification on the CNT ends also induces an obvious effect on the translocation of single strand DNA oligomers and gold nanoparticles under a modest pressure (<294Pa).

AB - We have fabricated porous membranes using a parylene encapsulated vertically aligned forest of multi-walled carbon nanotubes (MWCNTs, about 7nm inner diameter). The transport of charged particles in electrolyte through these membranes was studied by applying electric field and pressure. Under an electric field in the range of 4.4×10 4Vm 1, electrophoresis instead of electroomosis is found to be the main mechanism for ion transport. Small molecules and 5nm gold nanoparticles can be driven through the membranes by an electric field. However, small biomolecules, like DNA oligomers, cannot. Due to the weak electric driving force, the interactions between charged particles and the hydrophobic CNT inner surface play important roles in the transport, leading to enhanced selectivity for small molecules. Simple chemical modification on the CNT ends also induces an obvious effect on the translocation of single strand DNA oligomers and gold nanoparticles under a modest pressure (<294Pa).

UR - http://www.scopus.com/inward/record.url?scp=84867836485&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84867836485&partnerID=8YFLogxK

U2 - 10.1088/0957-4484/23/45/455101

DO - 10.1088/0957-4484/23/45/455101

M3 - Article

VL - 23

JO - Nanotechnology

JF - Nanotechnology

SN - 0957-4484

IS - 45

M1 - 455101

ER -