Effect of Surface Energy on Freezing Temperature of Water

Zhang, Yu; Anim-Danso, Emmanuel; Bekele, S.; Dhinojwala, Ali

doi:10.1021/acsami.6b02094

Cited by 55 publications

(55 citation statements)

References 51 publications

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“…In this method, it was also important to make the glass vials hydrophobic so that aqueous droplets did not adhere to them and break upon contact. We coated an octadecyltrimethoxysilane (OTS) self-assembled monolayer (SAM) onto glass vials following a modified protocol ( 31 ). We added 2–volume % OTS toluene solution into dry and clean glass vials and degassed for 15 min before tightly closing the cap.…”

Section: Methodsmentioning

confidence: 99%

Bioinspired bright noniridescent photonic melanin supraballs

et al. 2017

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Section: Methodsmentioning

confidence: 99%

Bioinspired bright noniridescent photonic melanin supraballs

et al. 2017

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“…The experimental and fitted results for J are shown in Figure 3b. Figure 3c shows the fitted values of f and its variation with E, emphasizing that the f only decreases sharply with E in the beginning and then stays almost constant when E exceeds As mentioned earlier, the factor f accounts for substrate-ice interactions and is governed by the energy [43][44] and geometry of the involved interfaces [45][46] . Owing to substrate-ice interactions, the free energy barrier for heterogeneous nucleation (ΔG) is reduced when compared to that for homogenous nucleation (ΔG homo ) by f = ΔG / ΔG homo (0 < f < 1).…”

Section: Resultsmentioning

confidence: 72%

Water Freezes at Near-Zero Temperatures Using Carbon Nanotube-Based Electrodes under Static Electric Fields

Huang

Kaur

Ahmed

et al. 2020

ACS Appl. Mater. Interfaces

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While static electric fields have been effective in controlling ice nucleation, the highest freezing temperature (Tf) of water that can be achieved in an electric field (E) is still uncertain. We performed a systematic study of the effect of an electric field on water freezing by varying the thickness of a dielectric layer and the voltage across it in an electro-wetting system. Results show that Tf first increases sharply with E, and then reaches a saturation at-3.5 °C after a critical value E of 6 × 10 6 V/m. Using classical heterogeneous nucleation theory, it is revealed that this behavior is due to saturation in the contact angle of the ice embryo with the underlying substrate. Finally, we show that it is possible to overcome this freezing saturation by controlling the uniformity of the electric field using carbon nanotubes. We achieve a Tf of-0.6 °C using carbon nanotubes based electrodes with an E of 3 × 10 7 V/m. This work sheds new light on the control of ice nucleation and has the potential to impact many applications ranging from food freezing to ice-production.

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“…Therefore, the increase of contact angle between ice nucleation and the substrate hinders ice crystallization. 40,58,59 Polarity and polarizability of uorine atoms…”

Section: Nucleation Free Energy Barriermentioning

confidence: 99%

A superrepellent coating with dynamic fluorine chains for frosting suppression: effects of polarity, coalescence and ice nucleation free energy barrier

et al. 2016

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Ice formation on surfaces is a serious issue in many different fields in terms of function, safety, and cost of operation in human life. Hydrophobic coating technology is one of the effective ways to prevent ice formation. Previous studies focused on the effects of surface structure and surface chemical modification on anti-icing ability. However, only a few studies have clarified a method to inhibit the initial formation of ice on surfaces; in addition, an effective mechanism for anti-frosting has not been identified as yet. Here, hydrophobic smooth surface coatings using three coupling agents with low surface energy and different molecular chain dynamics were fabricated. The surface roughnesses were lower than 1 nm.The fluorocarbon-based coatings delayed frost formation compared with the uncoated surface until À6 C. We explored why the coating surface prevented frost formation and the effects of surface chemical modification on frost resistance from the viewpoint of heat exchange contact area during droplet coalescence, ice nucleation free energy barrier, polarity and polarizability of the coated surface. † Electronic supplementary information (ESI) available: The chemical structure of decyltrimethoxysilane (DTMS), tridecauoro-1,1,2,2-tetrahydrooctyl-triethoxysilane (FAS13) and heptadecauoro-1,1,2,2-tetrahydrodecyl-triethoxy-silane (FAS17), FE-SEM image, FT-IR spectra, lm thickness distribution measured by ellipsometry analysis, transmittance measured by a spectrophotometer, total transmittance (TT), parallel transmittance (PT), diffusion (DIF) and haze values (HAZE) measured by a haze meter, the polarity factors of water, formamide and hexadecane, the polarity factors of the coating surface, photographic images of heating surface aer frosting test, the binarized photographic images during frosting test, the surface temperature with glass substrate and the coating surface, contact angle, sliding angle on the coating surface before freezing with aer freezing, classic heterogeneous nucleation theory, Hückel charge distribution of alkyl chain, uorocarbon and water molecular, the photographic images of frosting and water sliding angle of coating surfaces are changed molar ratio FAS to TEOS of solution, schematic image of measuring equipment of anti-frosting test. See

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Effect of Surface Energy on Freezing Temperature of Water

Cited by 55 publications

References 51 publications

Bioinspired bright noniridescent photonic melanin supraballs

Bioinspired bright noniridescent photonic melanin supraballs

Water Freezes at Near-Zero Temperatures Using Carbon Nanotube-Based Electrodes under Static Electric Fields

A superrepellent coating with dynamic fluorine chains for frosting suppression: effects of polarity, coalescence and ice nucleation free energy barrier

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