Possibility of Obtaining Two Orders of Magnitude Larger Electrokinetic Streaming Potentials, through Liquid Infiltrated Surfaces

Fan, Bei; Bandaru, Prabhakar R.

doi:10.1021/acs.langmuir.0c01771

Cited by 8 publications

(7 citation statements)

References 39 publications

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“…7,13 While a high b is hence desirable for a large V s , the conventional method through which SH surfaces are synthesized involves air-filled pockets. Related to this context, liquid-filled surfaces (LFS) were proposed 13,18,19 for optimizing the electrokinetic characteristics. Here, an electrolyte-immiscible oil was infiltrated into patterned surface grooves and the electrolyte flow over the LFS indicated a reduced b as well as an amplified ζ.…”

Section: ■ Introductionmentioning

confidence: 99%

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Influence of Surface Texture on the Variation of Electrokinetic Streaming Potentials

Cheng¹,

Fan

Zhang³

et al. 2021

Langmuir

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The electrokinetic streaming potential (V s ) obtained through electrolyte flow in a microchannel is shown to be related to the underlying surface pattern. Pillar, mesh, and groove patterns were studied for comparing the relative magnitudes of the V s with air-/liquid-filled surfaces. A record value of the related figure of merit, in terms of the developed V s per-unit applied pressure, of ∼0.127 mV/Pa, was observed in a mesh texture liquidfilled surface (LFS) impregnated with an electrolyte-immiscible oil. The study indicated that increasing the solid fraction of the pattern surface decreases the effective slip length while enhancing the overall channel ζ potential. Consequently, maximizing the obtained V s implies a balancing of the slip with the surface potential, with plausibly more significance of the latter. The work has implications for higher-efficiency electrical voltage sources.

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Section: ■ Introductionmentioning

confidence: 99%

“…Related to this context, liquid-filled surfaces (LFS) were proposed ,, for optimizing the electrokinetic characteristics. Here, an electrolyte-immiscible oil was infiltrated into patterned surface grooves and the electrolyte flow over the LFS indicated a reduced b as well as an amplified ζ.…”

Section: Introductionmentioning

confidence: 99%

Influence of Surface Texture on the Variation of Electrokinetic Streaming Potentials

Cheng¹,

Fan

Zhang³

et al. 2021

Langmuir

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“…a) Distribution of materials used in applications. [ 10,12–16,19,20,22–27,30,31,33–40,44–48,53–55,64–80,82–108,117–123 ] b) Output voltage and power density for different materials. c) The output voltage and d) averaged voltage of single and integrated devices.…”

Section: Methodsmentioning

confidence: 99%

Water‐Enabled Electricity Generation: A Perspective

Zhao

Shen

Duley

et al. 2022

Adv Energy and Sustain Res

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Harvesting energy from the environment offers many opportunities for the generation of clean power from self‐sustained systems and provides great promise for ameliorating the growing threat of the global environmental issues and the energy crisis. Ambient moisture and natural water sources have attracted huge research interest in the field of energy harvesting and conversion due to easy access, good sustainability, and the ubiquity of water on Earth. Taking advantage of the active interaction between water molecules and solid interfaces, various functional materials have been demonstrated to harvest energy and generate useable amounts of electrical power from water. In this review, some perspective on the development of water‐enabled electricity generation is given. The current preferred methods for water‐enabled electricity generation and relevant functional materials are summarized. Also, how the development of new materials and systems has led to significant improvements in the electrical power output reported for these devices is discussed. Then, some recent advances that have resulted in dramatic increases in the electrical output available from water‐enabled electrical generators (WEEGs) is discussed. Finally, some future trends in the development of WEEGs are outlined, and how this may result in practical applications and commercialization of these devices is shown.

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“…23,24 In contrast to the typical air-filled surfaces (AFS), alternate liquid filled surfaces (LFS) were fabricated by replacing the air with aqueous electrolyte immiscible oil (with a finite electrical potential) and generated a larger V s . 25,26 In such LFS, the infiltrated oil has been shown to be stable, and the LFS has been shown to maintain an intact surface over a range of pressures applied to the electrolyte flow channel. 27,28 It was also shown that there is negligible shear-induced drainage under external flow.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Therefore, a balance of b and ζ needs to be considered to obtain a higher V s . Filling air gaps or infiltrating pores with liquid to form a solid–liquid composite surface was suggested as one feasible methodology to achieve such a balance. , In contrast to the typical air-filled surfaces (AFS), alternate liquid filled surfaces (LFS) were fabricated by replacing the air with aqueous electrolyte immiscible oil (with a finite electrical potential) and generated a larger V s . , In such LFS, the infiltrated oil has been shown to be stable, and the LFS has been shown to maintain an intact surface over a range of pressures applied to the electrolyte flow channel. , It was also shown that there is negligible shear-induced drainage under external flow . The orientational effects on such liquid filled patterned surfaces, manifested through a tensorial aspect to the developed V s , were considered. , It was indicated through such experiments that ζ might contribute more to V s generation compared to the slip.…”

Section: Introductionmentioning

confidence: 99%

The Modulation of Electrokinetic Streaming Potentials of Silicon-Based Surfaces through Plasma-Based Surface Processing

et al. 2022

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A new plasma processing-based methodology for enhancing the streaming potential (V s ) that may be obtained in electrokinetic flows for a given pressure gradient over a silicon surface-based microchannel is indicated. The dependence of the V s on both the surface zeta potential and the electrolyte slip length was carefully determined through a series of experiments involving the variation of CF 4 -and Ar-based plasma parameters, incorporating pressure, exposure time, and power. It was determined through analytical estimates that, while the zeta potential is always increased, the slip length may be diminished under certain conditions. A record value of ∼0.1 mV/Pa was obtained using CF 4 plasma at 500 W, 10 mTorr, and 300 s of exposure. The implications of the work extend to the investigation of whether smooth surfaces may be effective for generating large V s 's for new modalities of electrical voltage sources in microfluidics-based applications.

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Possibility of Obtaining Two Orders of Magnitude Larger Electrokinetic Streaming Potentials, through Liquid Infiltrated Surfaces

Cited by 8 publications

References 39 publications

Influence of Surface Texture on the Variation of Electrokinetic Streaming Potentials

Influence of Surface Texture on the Variation of Electrokinetic Streaming Potentials

Water‐Enabled Electricity Generation: A Perspective

The Modulation of Electrokinetic Streaming Potentials of Silicon-Based Surfaces through Plasma-Based Surface Processing

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