pH-Triggered Adjustable Bursting of Liquid Marbles on Water Pool

Saurav Kumar; Nishanta Barman; Angana Borbora; Priyam Mondal; Mizuki Tenjimbayashi; Uttam Manna

doi:10.1039/D3TA06238D

論文 pH-Triggered Adjustable Bursting of Liquid Marbles on Water Pool

Saurav Kumar (Indian Institute of Technology Guwahati) ; Nishanta Barman (Indian Institute of Technology Guwahati) ; Angana Borbora (Indian Institute of Technology Guwahati) ; Priyam Mondal (Indian Institute of Technology Guwahati) ; Mizuki Tenjimbayashi (Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science) ; Uttam Manna (Indian Institute of Technology Guwahati)

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Saurav Kumar, Nishanta Barman, Angana Borbora, Priyam Mondal, Mizuki Tenjimbayashi, Uttam Manna. pH-Triggered Adjustable Bursting of Liquid Marbles on Water Pool. Journal of Materials Chemistry A. 2023, 12 (), 3362-3372. https://doi.org/10.1039/D3TA06238D

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(abstract)

Non-sticking millimetric droplets wrapped with micron/submicron-sized liquid repellent solid particles and aggregates are recognized as liquid marbles (LMs). LM behaves like a non-wetting solid which enables zeroloss transportation on solid surface and liquid pool. The challenge is controlling the liquid-releasing behavior, especially on the liquid pool. For example, releasing the inner liquid of LM at a specified time in adaptation to the liquid pool condition has not been achieved. In the past, different approaches were introduced to demonstrate instant release of inner liquid in presence of a specific stimulus—but the report on controlling the lifetime of floating LMs in presence of a stimulus is extremely rare in the literature. In this context, an inherently porous and crystalline nanomaterial, i.e., metal organic framework (MOF) is rationally transformed into a readily chemically reactive nanomaterial for associating both a) dual pH-responsive hydrophobicity and b) non-responsive superhydrophobicity through a 1,4-conjugate addition reaction. Further, the Kang-Jacobi wettability model was applied to examine the wettability transition of modified MOFs at various pH. The hydrophobic MOFs yielded LMs with the ability to automatically release inner liquid at a pre-defined time without requiring external intervention. Furthermore, the strategic association of protonizable amine, labile coordination bond and tailored hydrophobicity attributed to dual (acidic/alkaline) stimuli responsive adjustable life time of LMs on water pool. Such LMs were utilized for demonstrating 1) adjustable drug-release, 2) on-demand release of reactants to perform chemical reactions and 3) rapid optode detection of NO2 - .

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