Quick "easy?!" determination of the diameter of nanocapillaries

A. Lutfurakhmanov, R. Sailer, I. Akhatov, D. Schulz

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Precise measurements of the inner diameter (ID) of nanocapillaries are of interest to many areas of study due to the high sensitivity of gas and liquid flows with respect to the radius of the capillary. Applications ranging from biological transport to electronics manufacture require knowledge of fluid transport properties through passages with nanoscale dimensions. In the microscale, volume flow and fluid velocity are quadratic and squared functions of the capillary radius, respectively. While these relationships hold for most fluids in the nanoscale, the dependence on the ID is extreme with small variations in diameter leading to significant variations in flow properties. The current approach for measuring nanocapillary ID (i.e., FESEM) is time consuming and typically requires a conductive coating. A simple, nondestructive test to accurately determine the diameter of nanocapillaries based on bubble point was developed. The apparatus consists of a high pressure gas source connected to a nanopipette where the tip is located under the surface of a liquid. Bubble rate is determined as a function of pressure using an optical microscope. By using the Laplace relationship between surface tension induced pressure and capillary radius one can define inner diameter of nanocapillaries.

Original languageEnglish
Title of host publication2007 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2007, Technical Proceedings
Pages344-347
Number of pages4
Publication statusPublished - 2007
Externally publishedYes
Event2007 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2007 - Santa Clara, CA, United States
Duration: 20 May 200724 May 2007

Publication series

Name2007 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2007, Technical Proceedings
Volume3

Conference

Conference2007 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2007
Country/TerritoryUnited States
CitySanta Clara, CA
Period20/05/0724/05/07

Keywords

  • Bubble
  • Nanocapillary

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