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pH-Responsive Liquid Marbles Based on Dihydroxystearic Acid.

Jianxin Zhang1, Yao Gu1, Jianzhong Jiang1

  • 1The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, P. R. China.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 19, 2022
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Summary
This summary is machine-generated.

We developed pH-responsive liquid marbles using 9,10-dihydroxystearic acid (DHSA). These robust DHSA liquid marbles offer new applications for ammonia (NH3) sensing and chemical reactions due to their controlled disintegration.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Liquid marbles (LMs) are essential for microfluidic applications.
  • Fatty acids are commonly used to stabilize LMs.
  • Developing LMs with tunable properties and controlled disintegration is crucial.

Purpose of the Study:

  • To investigate pH-responsive liquid marbles stabilized by 9,10-dihydroxystearic acid (DHSA).
  • To explore the effect of DHSA on LM mechanical robustness and pH-triggered disintegration.
  • To assess the potential of DHSA-stabilized LMs in ammonia sensing and chemical reactions.

Main Methods:

  • Fabrication of liquid marbles using DHSA and other fatty acids.
  • Characterization of particle morphology and LM stability.
  • Evaluation of mechanical robustness and pH-triggered disintegration.
  • Testing LM performance as ammonia sensors.

Main Results:

  • DHSA-stabilized LMs exhibit enhanced mechanical robustness compared to LMs stabilized by stearic acid or docosoic acid.
  • The number of hydroxyl groups on the fatty acid carbon chain positively correlates with LM mechanical robustness.
  • DHSA-stabilized LMs rapidly disintegrate in alkaline solutions or upon exposure to ammonia gas.
  • The rolling time during LM preparation influences powder adsorption thickness and LM stability.

Conclusions:

  • 9,10-dihydroxystearic acid (DHSA) provides superior mechanical robustness to liquid marbles.
  • DHSA-stabilized liquid marbles demonstrate controlled, pH-triggered disintegration.
  • These findings highlight the potential of DHSA-based liquid marbles for ammonia sensing and microfluidic chemical reactions.