Document Detail


The Importance of Particle Tracking and Calculating the Mean-squared Displacement in Distinguishing Nanopropulsion from other Processes.
MedLine Citation:
PMID:  22731393     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
In this paper we show that processes such as Brownian motion, convection, sedimentation and bacterial contamination can cause small particles to move through liquids in a fashion which may be mistaken as nanopropulsion. It is shown that particle tracking and subsequent statistical analysis is essential to ascertain if small particles actually propel themselves, or if they are propelled by another process. Specifically we find that it is necessary to calculate the mean-squared displacement of particles at both short and long time intervals, to show that the direction of propulsion changes co-incident with rotation of the particle by Brownian motion, as this allows nanopropulsion to be differentiated from Brownian motion, convection and sedimentation. We also find that bacteria can attach themselves to particles and cause them to be propelled. This leads to motion which appears very similar to nanopropulsion and cannot be differentiated using particle tracking, and therefore find that carefully designed control experiments must be performed. Finally, we suggest an experiemental protocol which can be used to investigate the motion of small objects and prove if they move due to nanopropulsion.
Authors:
Gary James Dunderdale; Stephen Ebbens; Patrick Fairclough; Jonathan R Howse
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-25
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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