Tensorial Modulation of Electrokinetic Streaming Potentials on Air and Liquid Filled Surfaces

Fan, Bei; Bandaru, Prabhakar R.

doi:10.1021/acs.langmuir.9b02841

Cited by 13 publications

(18 citation statements)

References 35 publications

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“…The orientational effects on such patterned surfaces manifested through a tensorial aspect to the developed V s were considered. 20,21 However, many issues related to what would be an ideal patterned surface for a given solid (/liquid) fraction in the LFS are still unclear. One major consideration is the optimization of the ζ•b product evident from the H−S relation.…”

Section: ■ Introductionmentioning

confidence: 99%

“…For the given experimental conditions, L ∞ was at the mm scale, and it was assumed from such a consideration as well as from ESEM observations that the LFS are stable. 20,24 Streaming Potential (V s ) Measurement. The V s was monitored, on related pattern geometries in the microfluidics setup, using saltwater (with NaCl dissolved in water at a concentration of 0.1 mM) as an electrolyte.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Indeed, the enclosed oil yields a finite ζ different from the air, used in conventional AFS, and hence much larger V s values were measured for flows in the LFS-constituted systems. Earlier work reported streaming potential measurements on liquid-filled grooved surfaces, , with electrolyte flows either parallel or perpendicular to the groove direction. The orientational effects on such patterned surfaces manifested through a tensorial aspect to the developed V s were considered. , …”

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%

Section: ■ Introductionmentioning

confidence: 99%

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 oils were found to be immiscible with the aqueous electrolyte (NaCl in deionized to the grooves considering the robustness of the LFS, i.e., whether the filling liquid would experience drainage under external shear flow [38]. It was discussed previously that the filling liquid could be retained indefinitely in the grooves in such a configuration [39] and where the period (L) was less than a critical length [38]: 𝐿 ‡ , inversely proportional to the w/h ratio. Since, for the given conditions, 𝐿 ‡ was estimated to be of the order of millimeters, it was assumed, from such consideration as well from SEM observations after the experiments, Fig.…”

Section: (C)mentioning

confidence: 99%

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

Fan

Bandaru

2020

Langmuir

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A methodology for substantially increasing the magnitude of the electrokinetic streaming potential (Vs) from ~ 0.02 V to as large as ~ 1.6 V is proposed. This is done through deploying textured, liquid-filled surfaces (LFS), filled with low viscosity oils, for electrolyte flow. The charge density at the electrolyte-oil interface as well as the enhanced slip may be responsible for enhancement of the Vs. It was found, through experimental analysis as well as computational simulations, that the fluid slip length was inversely proportional to the filling oil viscosity, and influences the Vs. The study provides new perspectives related to complex electrolyte flow conditions as may be relevant for energy harvesting applications.

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“…It is observed that, in the comparison of batteries, unipolar transport through electric double layers in nanochannels may be coupled with liquid-infused surfaces to produce larger streaming potential. [46] In 2019, Wang et al reported a slippery lubricant-infused porous surface based on triboelectric nanogenerators, named as SLIPS-TENG, presenting configurability, optical transparency, self-cleaning, and power generation stability, in a wide range of working environmental temperatures from −3 to 25 °C. [47] Though in bending states, the SLIPS-TENG can still light up the LED bulb arrays on 200 nW.…”

Section: Liquid With Surfacesmentioning

confidence: 99%

Liquid‐Based Adaptive Structural Materials

Zhang

Chen

et al. 2021

Advanced Materials

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those merely of solid materials, such as the ultra-slippery surface of carnivorous plant (e.g., nepenthes), [1] dirt-resistant and optical perfect eyes, [2] the shape-adaptive and reversible adhesive insect feet, [3] lubricated and pressure-tolerant knees, [4] etc. With the synergistic effects of the interstitial liquid and tissues, simple living organisms are able to move, jump, grab, etc. spontaneously or in response to environmental stimuli, which offers numerous inspirations of bio-inspired applications for scientific research and development. [5] At present, the trend on developing novel adaptive structural materials through integrating the advantages both from liquid phase and solid phase is rising, providing great potentials for breaking the limitations of conventional solid materials. [6] Recently, liquid-based adaptive structural materials (LASMs) have entered the scene, and attracted increasing attention for their flexibilities in meeting the demands for various applications, including smart responsive devices, [7] droplet control and manipulations, [8] self-cleaning, anti-fogging, self-healing coating, [9] enhanced efficiency for electrokinetic energy conversion, [10] smart gating membranes, [11] etc. LASMs are structured materials that consist of dynamic liquid phase and stable solid phase. Liquid as a dynamic phase is natural in realizing the interfacial behaviors such as being defect-free, molecularly smooth, and self-assembly, etc. Complementarily, the solid phase offers skeleton and confinement for stabilizing liquid phase components, and meanwhile plays as matrices for the responsive behaviors of liquid phase triggered by specific stimuli. The responsiveness of solid substrates such as that of conductive or magnetic materials can enhance LASMs systems with wider selections of regulatory mechanisms, providing flexibilities and usefulness in more applications. Through rational interfacial designs, LASMs utilize the solid-liquid synergistic interaction of dynamic and static phases, showing both dynamic adaptivity and stable mechanical structure. In this way, solid phase and liquid phase with different properties offer complementary features for each other. The composition of liquid and solid phases can be seen as an analogy to the relational concept "Yin-Yang" in Chinese culture, where the dual powers that are different could complement each other. In Ancient Chinese Philosophy, "Yin" impresses us as soft, wet, cold, and passive, which is often associated with water, earth, the moon, femininity, and nights. "Yang" is hard, dry, hot, and active, which is the reflection of solid, sky, the sun, masculinity, and daytime. Similarly, liquids are fluid and Structural materials are used to provide stable mechanical architectures and transmit or support forces, and they play an important role in materials science and technology. During the long process of the exploitation of structural materials, the functionality of structural materials has gained prominence. Adaptive structures responding to external s...

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Tensorial Modulation of Electrokinetic Streaming Potentials on Air and Liquid Filled Surfaces

Cited by 13 publications

References 35 publications

Influence of Surface Texture on the Variation of Electrokinetic Streaming Potentials

Influence of Surface Texture on the Variation of Electrokinetic Streaming Potentials

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

Liquid‐Based Adaptive Structural Materials

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