Impurity-tuned non-equilibrium phase transition in a bacterial carpet

Yi Teng Hsiao, Kuan Ting Wu, Nariya Uchida, Wei Yen Woon

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The effects of impurity on the non-equilibrium phase transition in Vibrio alginolyticus bacterial carpets are investigated through a position-sensitive-diode implemented optical tweezers-microsphere assay. The collective flow increases abruptly as we increase the rotation rate of flagella via Na+ concentration. The effects of impurities on the transition behavior are examined by mixing cells of a wild type strain (VIO5) with cells of a mutant strain (NMB136) in different swimming patterns. For dilute impurities, the transition point is shifted toward higher Na+ concentration. Increasing the impurities' ratio to over 0.25 leads to a significant drop in the collective force, suggesting a partial orientational order with a smaller correlation length.

Original languageEnglish
Article number183701
JournalApplied Physics Letters
Issue number18
Publication statusPublished - 2016 May 2

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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