pH-Dependent Electrochemomechanical Transition of Hydrophobe-Water Interface

Kushagra, Arindam; Pradhan, Anup Kumar; Bazal, Diyasa

doi:10.1109/lsens.2019.2921146

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…The curved OW interface was obtained owing to the lower pH value of the aqueous phase [1]. To generate an alternating current by applying a DC voltage input across such an interface, we applied linearly ramping up DC voltage inputs ranging from -5V to 5V, and then decreasing it back to -5V.…”

Section: B Curved Ow Interfacementioning

confidence: 99%

“…Normally, we find these interfaces to be curved in nature. Electrochemomechanical transitions of such interfaces at varying pH have been studied, showing that flattening of OW interfaces take place in extreme alkaline conditions [1]. In extreme alkaline conditions, these interfaces flatten due to the ionization of constituent fatty-acid molecules of the oil.…”

Section: Introductionmentioning

confidence: 99%

“…Mustard oil was used as the oil phase in this work. Flattening of OW interface was done by increasing the pH of aqueous phase to 12 [1]. This happens due to the ionization of entire fatty acid constituents of mustard oil, short & long chain as well as mono-unsaturated & poly-unsaturated.One of the major mono-unsaturated fatty acid constituent of mustard oil is erucic acid has an estimated pKa value of 4.7.…”

Section: Introductionmentioning

confidence: 99%

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Faraday Instabilities Leading to Electrochemomechanical Generation of Sub-μA ACupon Application of DC Voltage Across Free Standing Oil-water Interfaces

Kushagra¹,

Pandey²,

Giri³

et al. 2020

Preprint

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In this article, we report the generation of alternating current by application of constant and ramping DC voltages across oil-water interfaces. The work reported here can be broadly divided into two parts depending on the shapes of oil-water interfaces i.e. flattened and curved. In the first part, an alternating current of ~100 nA (amplitude)was generated by applying a constant DC voltage of -3V& above across a free standing and flattened oil-water interface.In another part, an alternating current of ~150 nA (amplitude) was generated by applying a ramping up DC voltage starting from -5V to 5V, then again ramping back down to -5V for the free standing and curved interface. The suggested qualitative mechanism that engenders such a phenomenon includes the oil-water interface acting like a membrane. This membrane oscillates due to the electrophoretic movement of ions present in aqueous phase by application of a DC voltage across the interface.This electrophoretic movement of ions across oil-water interfaces causes the Faraday instabilities leading to oscillations of the said interface.This method could also be used to study the stress levels in the interfacial films between two immiscible liquids. It explores more-than-Moore’s paradigm by finding a substitute to a conventional alternator/inverter that generates alternating current upon applying DC voltage input. This work would be of substantial interest to researchers exploring alternatives to conventional AC generators that can be used in liquid environments and in the design of novel integrated circuits that could be used for unconventional computing applications.

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Section: B Curved Ow Interfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Faraday Instabilities Leading to Electrochemomechanical Generation of Sub-μA ACupon Application of DC Voltage Across Free Standing Oil-water Interfaces

Kushagra¹,

Pandey²,

Giri³

et al. 2020

Preprint

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“…Colloidal solution of coffee has been shown to be useful as a material for direct solar absorption 4 whereas caffeine has been used to improve the performance and thermal stability of perovskite solar cells 5 . Recently, an alternative way to sense extremely alkaline pH using the shape of hydrophobe-water interfaces was reported 6 .…”

Section: Introductionmentioning

confidence: 99%

Generation of Near-UV Absorption Band at Extremely Alkaline Ph in Colloidal Coffee

Kushagra¹,

Pandey²

2020

Orient. J. Chem

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Coffee and its primary ingredient, caffeine, have been used as solar absorbers and also to increase the thermal stability and efficiency of perovskite solar cells. In this work, we have reported the generation of an optical absorption band in the near-UV region in colloidal coffee solution at extremely alkaline pH values. This generation of absorption band could be explained by the orientation of various induced dipole-dipole interactions arising from varying pH. The said generation is due to narrowing of direct as well as indirect bandgaps from 4 eV→2.8 eV & 3.4 eV→2.5 eV, respectively. Additionally, we have estimated the changes in optical energy storage efficiency, inferring it to be highest for pH 11 having the highest intensity of the generated absorption band (λ abs ≈360 nm). With these observations and further deductions, the work reported in this paper would be of immense interest to the researchers working in the field of development of novel UV absorbers and also in the development of chemical pH sensors.

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A new analytical model for the response of AlGaN/GaN HEMT-based pH sensors

Upadhyay

Chattopadhyay

2021

J Comput Electron

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pH-Dependent Electrochemomechanical Transition of Hydrophobe-Water Interface

Cited by 7 publications

References 12 publications

Faraday Instabilities Leading to Electrochemomechanical Generation of Sub<em>-</em><em>μ</em>A ACupon Application of DC Voltage Across Free Standing Oil-water Interfaces

Faraday Instabilities Leading to Electrochemomechanical Generation of Sub<em>-</em><em>μ</em>A ACupon Application of DC Voltage Across Free Standing Oil-water Interfaces

Generation of Near-UV Absorption Band at Extremely Alkaline Ph in Colloidal Coffee

A new analytical model for the response of AlGaN/GaN HEMT-based pH sensors

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pH-Dependent Electrochemomechanical Transition of Hydrophobe-Water Interface

Cited by 7 publications

References 12 publications

Faraday Instabilities Leading to Electrochemomechanical Generation of Sub<em>-</em><em>&mu;</em>A ACupon Application of DC Voltage Across Free Standing Oil-water Interfaces

Faraday Instabilities Leading to Electrochemomechanical Generation of Sub<em>-</em><em>&mu;</em>A ACupon Application of DC Voltage Across Free Standing Oil-water Interfaces

Generation of Near-UV Absorption Band at Extremely Alkaline Ph in Colloidal Coffee

A new analytical model for the response of AlGaN/GaN HEMT-based pH sensors

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Product

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Faraday Instabilities Leading to Electrochemomechanical Generation of Sub<em>-</em><em>μ</em>A ACupon Application of DC Voltage Across Free Standing Oil-water Interfaces

Faraday Instabilities Leading to Electrochemomechanical Generation of Sub<em>-</em><em>μ</em>A ACupon Application of DC Voltage Across Free Standing Oil-water Interfaces