A smart pipet tip: Triboelectricity and thermoelectricity assisted in situ evaluation of electrolyte concentration

Choi, Dongwhi; Tsao, Yu-Hsiang; Chiu, Chih-Yi; Yoo, Donghyeon; Lin, Zong‐Hong; Kim, Dong Sung

doi:10.1016/j.nanoen.2017.06.020

Cited by 33 publications

(15 citation statements)

References 51 publications

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“…In principle, the electrification trends could reverse, e.g., from negative to positive, for a hydrophobic surface with positive charge. These findings advance the scientific understanding of electrification and rational design of technologies that involve electrowetting 1 , micro/nano fluidics and pipetting 6 , 7 , 9 , 95 , triboelectric power generation 10 , 12 , desalination 96 , 97 , and materials and surface engineering 91 , 98 , 99 , among others.…”

Section: Discussionmentioning

confidence: 68%

“…Electrification underlies various curious phenomena, such as the electrostatic manipulation of droplets placed on hydrophobic surfaces 1 – 3 and Kelvin generators 4 – 6 . The electrification of water against hydrophobic surfaces (hereafter referred to as water-hydrophobe interfaces) plays an important role in various applied and natural contexts, such as pipetting 7 – 9 , triboelectric power generation 10 – 12 , hydrogen generation 13 , 14 , mitigating dust deposition on solar panels 15 , preventing fire hazards in granular flows 16 , and precipitation and thundercloud charging 17 , 18 . However, the causes and mechanisms underlying this electrification process are still intensely debated 11 , 14 , 19 – 37 .…”

Section: Introductionmentioning

confidence: 99%

“…A variety of mechanisms have been put forth to explain electrification of water in contact with solid/liquid/gaseous hydrophobes, including the specific adsorption of hydroxide ions 38 – 48 and hydronium ions 14 , 49 – 55 , the dipolar organization of interfacial water 19 , 22 , 56 , the partial charge transfer between the O and H atoms of interfacial water 57 , 58 or between interfacial water and oil molecules 59 , the adsorption of bicarbonate ions due to the dissolution of ambient CO 2 60 , contamination 61 – 66 , reactive chemical groups 8 , 9 , 67 – 69 , electrons trapped on the surface of insulators 70 – 72 and mechanoradicals 73 , 74 . With the exception of surface-bound electrons, these mechanisms assume that common hydrophobic surfaces such as polypropylene and perfluorocarbons are electrically neutral in air.…”

Section: Introductionmentioning

confidence: 99%

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Electrification at water–hydrophobe interfaces

et al. 2020

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The mechanisms leading to the electrification of water when it comes in contact with hydrophobic surfaces remains a research frontier in chemical science. A clear understanding of these mechanisms could, for instance, aid the rational design of triboelectric generators and micro- and nano-fluidic devices. Here, we investigate the origins of the excess positive charges incurred on water droplets that are dispensed from capillaries made of polypropylene, perfluorodecyltrichlorosilane-coated glass, and polytetrafluoroethylene. Results demonstrate that the magnitude and sign of electrical charges vary depending on: the hydrophobicity/hydrophilicity of the capillary; the presence/absence of a water reservoir inside the capillary; the chemical and physical properties of aqueous solutions such as pH, ionic strength, dielectric constant and dissolved CO2 content; and environmental conditions such as relative humidity. Based on these results, we deduce that common hydrophobic materials possess surface-bound negative charge. Thus, when these surfaces are submerged in water, hydrated cations form an electrical double layer. Furthermore, we demonstrate that the primary role of hydrophobicity is to facilitate water-substrate separation without leaving a significant amount of liquid behind. These results advance the fundamental understanding of water-hydrophobe interfaces and should translate into superior materials and technologies for energy transduction, electrowetting, and separation processes, among others.

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Section: Discussionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrification at water–hydrophobe interfaces

et al. 2020

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“…A closer integration of TENGs with electrolytes may provide new directions for research and triboelectric effects associated with electrical double layers has recently been reported in novel sensing tribo-devices. 224 There is also potential to combine the active harvesting material with storage, as an example the understanding of the pyro-and piezo-electric properties of metal-organic frameworks (MOFs) is growing, 225 and these materials also have potential for gas storage applications so that combined harvesting for hydrogen production and storage may be feasible. The potential of pyroelectric effects to achieve water splitting by thermal cycling above and below the Curie temperature is a new and exciting prospect for hydrogen generation, but experimental data is needed to validation model predictions and mechanisms.…”

Section: Discussionmentioning

confidence: 99%

Control of electro-chemical processes using energy harvesting materials and devices

et al. 2017

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Energy harvesting is a topic of intense interest that aims to convert ambient forms of energy such as mechanical motion, light and heat, which are otherwise wasted, into useful energy. In many cases the energy harvester or nanogenerator converts motion, heat or light into electrical energy, which is subsequently rectified and stored within capacitors for applications such as wireless and self-powered sensors or low-power electronics. This review covers the new and emerging area that aims to directly couple energy harvesting materials and devices with electro-chemical systems. The harvesting approaches to be covered include pyroelectric, piezoelectric, triboelectric, flexoelectric, thermoelectric and photovoltaic effects. These are used to influence a variety of electro-chemical systems such as applications related to water splitting, catalysis, corrosion protection, degradation of pollutants, disinfection of bacteria and material synthesis. Comparisons are made between the range harvesting approaches and the modes of operation are described. Future directions for the development of electro-chemical harvesting systems are highlighted and the potential for new applications and hybrid approaches are discussed.

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“…They utilized the spontaneously generated electric signals during the pipetting process 143 . The smart pipette tip was used for in situ prediction of both the concentration and morphology of palladium (Pd) nanoparticles in the electrolyte.…”

Section: Materials Design For Chemical Sensorsmentioning

confidence: 99%

Material aspects of triboelectric energy generation and sensors

et al. 2020

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The triboelectric nanogenerator (TENG) is a new type of energy generator first demonstrated in 2012. TENGs have shown potential as power sources for electronic devices and as sensors for detecting mechanical and chemical stimuli. To date, studies on TENGs have focused primarily on optimizing the systems and circuit designs or exploring possible applications. Even though triboelectricity is highly related to the material properties, studies on materials and material designs have been relatively less investigated. This review article introduces recent progress in TENGs, by focusing on materials and material designs to improve the electrical output and sensing performance. This article discusses the current technological issues and the future challenges in materials for TENG.

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A smart pipet tip: Triboelectricity and thermoelectricity assisted in situ evaluation of electrolyte concentration

Cited by 33 publications

References 51 publications

Electrification at water–hydrophobe interfaces

Electrification at water–hydrophobe interfaces

Control of electro-chemical processes using energy harvesting materials and devices

Material aspects of triboelectric energy generation and sensors

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