Influence of pH on the Motion of Catalytic Janus Particles and Tubular Bubble-Propelled Micromotors

James Guo Sheng Moo, Hong Wang, Martin Pumera

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Self-propelled miniaturized machines harness the chemical potential of their environment for movement. Locomotion of chemically powered micromotors have been hugely dependent on the surroundings. The use of pH to alter the mobility of micromotors is demonstrated in this work through the manipulation of hydrogen peroxide chemistry in different acidity/alkalinity. The sequential addition of sodium hydroxide to increase the pH of the solution led to a consequent increase in activity of micromotors. Meanwhile, addition of hydrochloric acid compromised the structural integrity of the microstructures, culminating in locomotive changes. Such dramatic changes in activity and velocities of the micromotors allow the usage of this behavior for pH detection. This concept was illustrated with Janus silver micromotors and tubular bimetallic Cu/Pt micromotors. Alteration of pH serves as a useful general strategy for increasing hydrogen peroxide decomposition for enhanced oxygen-bubble propulsion in catalytic micromotors.

Original languageEnglish
Pages (from-to)355-360
Number of pages6
JournalChemistry - A European Journal
Volume22
Issue number1
DOIs
Publication statusPublished - 2016 Jan 4

Fingerprint

Micromotors
Hydrogen peroxide
Hydrogen Peroxide
Sodium Hydroxide
Locomotives
Hydrochloric Acid
Chemical potential
Structural integrity
Hydrochloric acid
Alkalinity
Silver
Acidity
Propulsion
Sodium
Oxygen
Decomposition
Microstructure

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Organic Chemistry

Cite this

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Influence of pH on the Motion of Catalytic Janus Particles and Tubular Bubble-Propelled Micromotors. / Moo, James Guo Sheng; Wang, Hong; Pumera, Martin.

In: Chemistry - A European Journal, Vol. 22, No. 1, 04.01.2016, p. 355-360.

Research output: Contribution to journalArticle

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