Superhydrophilic–superhydrophobic patterned surfaces: From simplified fabrication to emerging applications

Chen, Hao; Li, Xiao Ping; Li, Dachao

doi:10.1063/10.0013222

Cited by 18 publications

(15 citation statements)

References 238 publications

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“…It is known that for hydrophilic surfaces, roughness is a contributing factor for increased hydrophilicity, leading to superhydrophilic surfaces with high water uptake. 49 This morphology agrees with the previous results in this work, showing complete water absorption in this layer.…”

Section: ■ Resultssupporting

confidence: 93%

Evaluating Droplet Survivability on Face Masks with X-ray Microtomography

Gonçalves,

Weon

2023

ACS Appl. Bio Mater.

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When a person talks, coughs, or sneezes, respiratory droplets are expelled and inevitably land on several surfaces, representing a route for respiratory disease transmission. Here, face masks act as a barrier by obstructing the passage of droplets during exhalation and inhalation. Being constantly exposed to respiratory events and carrying droplet residue, understanding the evaporation and absorption dynamics for tiny droplets on face masks and the fate of viral particle deposition is necessary to analyze the contamination risk. We explore the ideal design for masks from the interaction of mask surfaces with surrogate respiratory droplets by X-ray microscopy and microtomography. We show that the respiratory droplet survivability is significantly reduced in masks with a hydrophilic surface where absorption takes place, leading to a reduction of the postevaporation droplet residue at the mask surface compared with a hydrophobic surface. The results allow us to propose a better mask layer design dependent on wettability, reducing the risk of contamination from respiratory droplets.

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Section: ■ Resultssupporting

confidence: 93%

Evaluating Droplet Survivability on Face Masks with X-ray Microtomography

Gonçalves,

Weon

2023

ACS Appl. Bio Mater.

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“…In comparison, Chen et al, Si et al and Wang et al classified hydrophobic surfaces differently. A surface with a contact angle below 10° is superhydrophilic, between 10-65° hydrophilic, between 65-150° hydrophobic and above 150° superhydrophobic (Chen et al, 2022; Si et al, 2018; Wang et al, 2018). We determined the contact angle of uncoated and phospholipid-coated microbeads, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…According to the contact angle, the phospholipids seem to bind best to MB3, here the contact angle is lowest after coupling. According to the definition of Chen et al, Si et al and Wang et al (Chen et al, 2022; Si et al, 2018; Wang et al, 2018, only the surface of microbead population MB3 is hydrophilic, all other microbead surfaces are still in the hydrophobic range. However, a smaller contact angle (difference of up to 31°) occurred after the coupling of phospholipids.…”

Section: Resultsmentioning

confidence: 99%

Immobilisation of Lipophilic and Amphiphilic Biomarker on Hydrophobic Microbeads

Dinter

Thiehle

Schedler

et al. 2023

Preprint

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Background: Lipids and amphiphilic molecules are ubiquitous and play a central role in cell signalling, cell membrane structure, and lipid transport in the human body. However, they also appear in many diseases such as atherosclerosis, cardiovascular diseases, infections, inflammatory diseases, cancer, and autoimmune diseases. Thus, it is necessary to have detection systems for lipids and amphiphilic molecules. Microbeads can be one of these systems for the simultaneous detection of different lipophilic biomarkers. Methods: Based on the fundamentals of microbead development, novel hydrophobic microbeads were produced. These not only have a hydrophobic surface, but are also fluorescently encoded and organic solvent resistant. The challenge after the development of the hydrophobic microbeads was to immobilise the amphiphilic molecules, in this study phospholipids, on the microbead surface in an oriented direction. After successful immobilisation of the biomarkers, a suitable antibody based detection assay was established. Results: By passive adsorption, the phospholipids cardiolipin, phosphatidylethanolamine and phosphatidylcholine could be bound to the microbead surface. With the application of the enzymes phospholipase A2 and phospholipase C, the directional binding of the phospholipids to the microbead surface was demonstrated. The detection of directional binding indicated the need for the hydrophobic surface. Microbeads with no hydrophobic surface bound the phospholipids non-directionally (with the hydrophilic head) and were thus no longer reactively accessible for detection. Conclusion: With the newly developed hydrophobic, dual coded and solvent stable microbeads it is possible to bind amphiphilic biomolecules directionally onto the microbead surfaces.

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“…For instance, inspired by properties of biosurfaces, e.g. lotus leaves, researchers have developed superhydrophobic surfaces − (see Figure ). This involves adding micronano scale protrusions to a given surface, which reduces the surface wettability and consequently enhances its slipperiness. , These micronano structures, often in the form of grooves, posts and holes, are deliberately engineered on both hydrophilic and hydrophobic surfaces.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Shear Flows over Superhydrophobic Surfaces: From Newtonian to Non-Newtonian Fluids

Rahmani,

Larachi,

Taghavi

2024

ACS Eng. Au

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The design and use of superhydrophobic surfaces have gained special attentions due to their superior performances and advantages in many flow systems, e.g., in achieving specific goals including drag reduction and flow/droplet handling and manipulation. In this work, we conduct a brief review of shear flows over superhydrophobic surfaces, covering the classic and recent studies/ trends for both Newtonian and non-Newtonian fluids. The aim is to mainly review the relevant mathematical and numerical modeling approaches developed during the past 20 years. Considering the wide ranges of applications of superhydrophobic surfaces in Newtonian fluid flows, we attempt to show how the developed studies for the Newtonian shear flows over superhydrophobic surfaces have been evolved, through highlighting the major breakthroughs. Despite the fact that, in many practical applications, flows over superhydrophobic surfaces may show complex non-Newtonian rheology, interactions between the non-Newtonian rheology and superhydrophobicity have not yet been well understood. Therefore, in this Review, we also highlight emerging recent studies addressing the shear flows of shear-thinning and yield stress fluids in superhydrophobic channels. We focus on reviewing the models developed to handle the intricate interaction between the formed liquid/air interface on superhydrophobic surfaces and the overlying flow. Such an intricate interaction will be more complex when the overlying flow shows nonlinear non-Newtonian rheology. We conclude that, although our understanding on the Newtonian shear flows over superhydrophobic surfaces has been well expanded via analyzing various aspects of such flows, the non-Newtonian counterpart is in its early stages. This could be associated with either the early applications mainly concerning Newtonian fluids or new complexities added to an already complex problem by the nonlinear non-Newtonian rheology. Finally, we discuss the possible directions for development of models that can address complex non-Newtonian shear flows over superhydrophobic surfaces.

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Superhydrophilic–superhydrophobic patterned surfaces: From simplified fabrication to emerging applications

Cited by 18 publications

References 238 publications

Evaluating Droplet Survivability on Face Masks with X-ray Microtomography

Evaluating Droplet Survivability on Face Masks with X-ray Microtomography

Immobilisation of Lipophilic and Amphiphilic Biomarker on Hydrophobic Microbeads

Modeling of Shear Flows over Superhydrophobic Surfaces: From Newtonian to Non-Newtonian Fluids

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