Fundamental nanoscale surface strategies for robustly controlling heterogeneous nucleation of calcium carbonate

Zhao, Junjie; Wang, Minghui; Jebutu, Mofoluwaso S.; Zhu, Minghui; Gleason, Karen K.

doi:10.1039/c9ta04341a

Cited by 26 publications

(17 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…112 These smooth surface modification layers can outperform the lower surface energy PFDA-containing films for some protective applications, including the reducing the formation of inorganic scale. 112,119 Copolymerization of V4D4 and cyclohexylmethacrylate yielded a smooth, transparent iCVD film with moisture barrier properties of interest for electronics protection. 120 The PFDA and 1H,1H,2H,2H-perfluorodecyl methacrylate (PFDMA) monomers both possess a C8 [-(CF2)8F] pendent chain.…”

Section: Hydrophobic Surfacesmentioning

confidence: 99%

Nanoscale control by chemically vapour-deposited polymers

Gleason

2020

Nat Rev Phys

Self Cite

104

View full text Add to dashboard Cite

show abstract

Section: Hydrophobic Surfacesmentioning

confidence: 99%

Nanoscale control by chemically vapour-deposited polymers

Gleason

2020

Nat Rev Phys

Self Cite

104

View full text Add to dashboard Cite

show abstract

“…First, we conducted condensation-frosting experiments (see the Experimental Section) on pPFDA-coated silicon (pPFDA/Si) and bare-Al surfaces as control samples. The hydrophobic pPFDA/Si exhibited delayed frost growth when compared to the bare-Al because of the low surface energy of the pPFDA polymer (approximately 9.36 mN/m) , (Figure a, Video M1). The hydrophilic bare-Al surface (with a surface energy of approximately 850 mN/m) promoted the heterogenous droplet nucleation and growth leading to a faster and successful ice-bridging, when compared to the small droplets on the hydrophobic pPFDA/Si.…”

Section: Resultsmentioning

confidence: 99%

“…64,65 The cold substrates with a lower surface energy require a higher supersaturation degree for nucleation, when compared to substrates with a higher surface energy. Therefore, frost formation on the hydrophobic pPFDA/Si substrate (with a surface energy of approximately 9.36 mN/m) 35 is less favored, when compared to the bare-Al substrate (with a surface energy of approximately 850 mN/m). 37 Furthermore, the condensate water droplets on the pPFDA/Si exhibit a nearly spherical shape with a contact angle of ∼119°.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Delayed Frost Growth on Nanoporous Microstructured Surfaces Utilizing Jumping and Sweeping Condensates

et al. 2020

Self Cite

View full text Add to dashboard Cite

Self-propelled jumping of condensate droplets (dew) enables their easy and efficient removal from surfaces and is essential for enhancing the condensation heat transfer coefficient and for delaying the frost growth rate on supercooled surfaces. Here, we report the droplet-jumping phenomenon using nanoporous vertically aligned carbon nanotube (VA-CNT) microstructures grown on smooth silicon substrates and coated with poly-(1H, 1H, 2H, 2H-perfluorodecylacrylate) (pPFDA). We also report dropletsweeping phenomenon on horizontally mounted surfaces, concluding that the frost surface coverage area and the frost growth rates observed with the droplet-sweeping phenomenon are much lower than those that are observed with the droplet-jumping phenomenon alone. We also investigate the fundamentals of droplet-jumping and the frost growth phenomena using line-shaped, hollow-cylindrical, and cylindrical microstructures, comparing the frost surface coverage area and the ice-bridging times during condensation-frosting, prolonged condensation-frosting, and direct-frosting. We find that the closely spaced thin line-shaped microstructures and hollow-cylindrical microstructures are optimal for frost coverage reduction because of their ability to exhibit droplet-jumping and droplet-sweeping phenomena. We observe that adding nonuniform roughness on top of the microstructures leads to jumping-associated droplet-sweeping on supercooled surfaces. Here, we report the evaporation of an already frozen droplet because of freezing of a supercooled condensate droplet in its close vicinity, enabling the Cassie−Baxter state frost growth and enhancing defrosting efficiency. Finally, we discuss the dynamic defrosting behavior of the pPFDA-coated VA-CNT microstructures, concluding that the small gaps (spacings) between the microstructures not only enable dewetting transitions of droplets but also promote the Cassie−Baxter state frost formation.

show abstract

“…Heterogeneous nucleation is a phase change process in which a new phase forms onto an existing seed. These processes are important for example in material sciences [1][2][3][4] , in atmospheric cloud and ice nuclei formation [5][6][7] and for fundamental understanding of physics and chemistry [8][9][10] . In the specific case of gas-to-particle conversion, new solid particles or liquid droplets form via heterogeneous nucleation and subsequent condensation of vapors.…”

Section: Introductionmentioning

confidence: 99%

Molecular Origin of the Sign Preference of Ion- Induced Heterogeneous Nucleation in a Complex Ionic Liquid–Diethylene Glycol System

et al. 2020

View full text Add to dashboard Cite

Heterogeneous nucleation on charged seeds has been shown to frequently prefer a given sign of electrical charge (anion or cation), at constant seed size and (apparent) chemical composition. For some systems, this sign preference can be readily understood in terms of individual chemical interactions. However, experiments are in general unable to provide satisfying molecular-level explanations for the sign preference of chemically complex systems. Here, we experimentally demonstrate a positive sign preference for charged ionic liquid seeds (CILS) with diethylene glycol vapor (DEG) and explain the physicochemical origins of this preference via quantum chemical calculations. The computational results show that all enthalpies and free energies for adsorption of DEG onto the CILS clusters are lower for the positively charged seeds compared to those for the negatively charged seeds. The main reason for this difference is the stronger hydrogen bonds in the cationic clusters originating from the ability of imidazolium-based cations to act as hydrogen bond acceptors.

show abstract

Fundamental nanoscale surface strategies for robustly controlling heterogeneous nucleation of calcium carbonate

Abstract: Stable ultrathin polymer films synthesized via initiated chemical vapor deposition enable robust control of heterogeneous nucleation of CaCO3 on metal heat transfer surfaces at high temperatures.

Cited by 26 publications

References 43 publications

Nanoscale control by chemically vapour-deposited polymers

Nanoscale control by chemically vapour-deposited polymers

Delayed Frost Growth on Nanoporous Microstructured Surfaces Utilizing Jumping and Sweeping Condensates

Molecular Origin of the Sign Preference of Ion- Induced Heterogeneous Nucleation in a Complex Ionic Liquid–Diethylene Glycol System

Contact Info

Product

Resources

About