Inhibition of condensation-induced droplet wetting by nano-hierarchical surfaces

Song, Jiayu; Hou, Youmin; Sudersan, Pranav; Lam, Cheuk Wing Edmond; Poulikakos, Dimos; Butt, Hans‐Jürgen; Yeung, King Lun

doi:10.1016/j.cej.2023.141761

Cited by 16 publications

(7 citation statements)

References 56 publications

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“…[ 71 ] In our experiments, we measure maximum values of h pc of ≈1300W m −2 K (for with‐ g , ϕ = 10%, and H = 2.4 mm – see Supporting Information for details), whereas previous works have reported heat transfer coefficients approaching 100,000W m −2 K for jumping droplet condensation in pure vapor conditions on nanostructured metal surfaces. [ 26,72,73 ] Increasing h pc by eliminating NCGs would therefore represent a promising approach to improve upon the values of η measured here. Opportunities to remove NCGs are a focus of our ongoing work and could include using a dedicated degassing/charging system to ensure that charged DI water is sufficiently degassed prior to measurements, [ 74 ] or reducing potential leakage at mating interfaces with improved sealing features such as pressure‐energized face seal glands.…”

Section: Resultsmentioning

confidence: 99%

Teflon AF–Coated Nanotextured Aluminum Surfaces for Jumping Droplet Thermal Rectification

Shimokusu,

Nathani,

Liu

et al. 2024

Adv Materials Inter

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Jumping droplet thermal diodes (JDTDs) are promising candidates to achieve thermal rectification for next‐generation thermal control. However, most prior demonstrations of JDTDs have relied on monolayer‐coated copper‐based superhydrophobic (SHPB) surfaces, while lower‐cost aluminum JDTDs with more durable thin polymeric coatings have not been explored. In this work, a JDTD is constructed that employs SHPB aluminum surfaces coated with protective thin films of Teflon AF (amorphous fluoropolymer) 1601. Measurements for different heating orientations, gap heights (H), and fill ratios (ϕ) show that a maximum thermal rectification ratio of 7 can be achieved for H = 2.4 mm and ϕ = 10%. A thermal circuit is demonstrated that uses the JDTD to rectify time‐periodic temperature profiles, achieving thermal circuit effectiveness values up to 30% of the ideal‐diode limit. Coupon‐level durability tests and device‐level cycling show that dip coated Teflon AF enables stable operation of Al JDTDs over >20 cycles, improving on the performance of a monolayer‐coated surface that fails after 5 cycles. The findings of this work signify that Teflon AF coated Al SHPB surfaces can be used for thermal rectification and motivate future research into Al JDTDs for advanced thermal management applications.

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Section: Resultsmentioning

confidence: 99%

Teflon AF–Coated Nanotextured Aluminum Surfaces for Jumping Droplet Thermal Rectification

Shimokusu,

Nathani,

Liu

et al. 2024

Adv Materials Inter

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“…First, the method involved the ingestion of particular nutrients derived from diverse sources, including plant-based extracts, minerals, vitamins, amino acids, metals, fibers, prebiotics, and saturated fats. However, the second procedure involves limiting specific foods and vitamins, such as dietary carbohydrates and amino acid composition, or adopting a time-restricted dietary regimen, such as intermittent fasting or a fasting-mimicking diet [183]. For instance, dementia risk was found to be higher in individuals with higher intake of total sugars and carbohydrates [184].…”

Section: Type Of Dietsmentioning

confidence: 99%

The Interplay of Sports and Nutrition in Neurological Health and Recovery

Clemente-Suárez,

Redondo-Flórez,

Beltrán-Velasco

et al. 2024

JCM

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This comprehensive review explores the dynamic relationship between sports, nutrition, and neurological health. Focusing on recent clinical advancements, it examines how physical activity and dietary practices influence the prevention, treatment, and rehabilitation of various neurological conditions. The review highlights the role of neuroimaging in understanding these interactions, discusses emerging technologies in neurotherapeutic interventions, and evaluates the efficacy of sports and nutritional strategies in enhancing neurological recovery. This synthesis of current knowledge aims to provide a deeper understanding of how lifestyle factors can be integrated into clinical practices to improve neurological outcomes.

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“…FAS was chosen as it is the most used superhydrophobic coating in water condensation research. [26][27][28][29][30][40][41][42][43][44][45] The nanostructure selected for fabricating superhydrophobic surfaces was TiO 2 nanorods (NR) because titanium is used in industrial heat exchangers for its lightweight, superb mechanical strength, and excellent corrosion resistance. [46] The TiO 2 nanorods coated with branched siloxane (Siloxane2-NR) exhibited exceptional droplet nucleation and droplet departure rates compared with the nanorods coated with fluoroalkylsilane (FAS-NR) and linear siloxane (Siloxane1-NR).…”

Section: Introductionmentioning

confidence: 99%

Hierarchically Branched Siloxane Brushes for Efficient Harvesting of Atmospheric Water

Song

Liu

et al. 2023

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Atmospheric water harvesting is considered a viable source of freshwater to alleviate water scarcity in an arid climate. Water condensation tends to be more efficient on superhydrophobic surfaces as the spontaneous coalescence‐induced droplet jumping on superhydrophobic surfaces enables faster condensate removal. However, poor water nucleation on these surfaces leads to meager water harvest. A conventional approach to the problem is to fabricate micro‐ and nanoscale biphilic structures. Nonetheless, the process is complex, expensive, and difficult to scale. Here, the authors present an inexpensive and scalable method based on manipulating the water‐repellent coatings of superhydrophobic surfaces. Flexible siloxane can facilitate water nucleation, while a branched structure promotes efficient droplet jumping. Moreover, ToF‐SIMS analysis indicated that branched siloxane provides a better water‐repellent coating coverage than linear siloxane and the siloxanes comprise hydrophilic and hydrophobic molecular segments. Thus, the as‐prepared superhydrophobic surface, TiO2 nanorods coated with branched siloxanes harvested eight times more water than a typical fluoroalkylsilane (FAS)‐coated surface under a low 30% relative humidity and performed better than most reported biphasic materials.

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Inhibition of condensation-induced droplet wetting by nano-hierarchical surfaces

Cited by 16 publications

References 56 publications

Teflon AF–Coated Nanotextured Aluminum Surfaces for Jumping Droplet Thermal Rectification

Teflon AF–Coated Nanotextured Aluminum Surfaces for Jumping Droplet Thermal Rectification

The Interplay of Sports and Nutrition in Neurological Health and Recovery

Hierarchically Branched Siloxane Brushes for Efficient Harvesting of Atmospheric Water

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