A superhydrophobic (SHB) surface with an excellent self-cleaning ability is of great significance in both human survival and industrial fields. However, it still a challenge to achieve large-area preparation antiabrasive SHB surfaces mechanical robustness for broader applications. Thus, kind facile coating liquid repellency antiresistance constructed by spraying fluorine-free suspension consisting epoxy resin, hexadecyltrimethoxysilane (HDTMS), silica nanoparticles on glass sheet. The not...

Abstract Two types of functional surfaces with the same roughness but completely different surface topographies are prepared, namely positively skewed filled micropillar arrays (Sa ≈4.4 µm, Ssk >0) and negatively microcavity <0), demonstrating promoting droplet splashing. Remarkably, critical Weber number for generating satellite droplets on is significantly lower than that surfaces, indicating more likely to promote It mainly attributed fact air can make liquid film take a...

Superhydrophobic surfaces (SHSs) have possibilities for achieving significantly reduced solid–liquid frictional drag in the marine sector due to their excellent water-repelling properties. Although stability of SHSs plays a key role reduction, little consideration was given effect extreme environments on ability achieve reduction underwater, particularly when subjected acidic conditions. Here, we propose interconnected microstructures protect superhydrophobic coatings with aim enhancing...

Regulation over the generation of Leidenfrost phenomenon in liquids is vitally important a cutting fluid/tool system, with benefits ranging from optimizing heat transfer efficiency to improving machining performance. However, realizing influence mechanism liquid boiling at various temperatures still faces enormous challenges. Herein, we report kind microgrooved tool surface by laser ablation, which could obviously increase both static and dynamic point fluid adjusting roughness (Sa). The...

The wear-resistant superhydrophobic (SHB) surfaces with excellent water-repellency ability were prepared by constructing a microtextured armor on an aluminum surface. With the assistance of laser-induced microtextures, SHB surface could keep longer and lower friction coefficient even after repeated tests under different loads at speeds. mechanism microtexture-protecting coating is revealed based both theoretical elemental analysis. Additionally, we explore relationship between...

In this study, we fabricated two types of functional surfaces with the same roughness (Sa) but entirely opposite surface morphological features, which are defined as positively skewed filled protruding cylinder array (Ssk > 0) and negatively circular pit < 0). The effect morphology peak-valley features on droplet splash is analyzed, formation mechanism prompt corona also indicated based Kelvin–Helmholtz instability. Our results demonstrate that, under conditions Sa, interaction...

Shape memory polymers (SMPs) with tunable wettability and reversible adhesion through adjusting the surface morphology have great prospects in functional devices. However, current devices based on SMPs are mainly concentrated manipulation of diverse liquid droplets air; it is still a challenge to achieve tuning underwater oil microstructured SMP surface. Herein, we fabricate kind micropillar array one-step femtosecond laser irradiation, which could between tilted upright states. It worth...

In this work, we proposed a facile underwater air cavity generation strategy based on rough microstructured spheres and explored its water entry dynamics drag reduction characteristics. Under the assistance of microstructures, three-phase contact line is pinned near sphere equator inhibits wetting liquid film along surface, so that leading formation cavity. The process mainly divided into four stages: flow formation, opening stretching, closure entrapment, collapse. With Froude number Fr,...

In the process of oil–gas micro-lubrication, lubricant oil liquids are disturbed by high-speed airflow and prone to forming droplets containing micro-bubbles. Micro-bubbles have a significant influence on kinetic characteristics successive/synchronous droplet impingement an film its formation mechanism. Numerical simulations impinging behavior based coupled level set-volume fraction (CLSVOF) method. The effect micro-bubbles flow dynamics impinge double is investigated. To investigate...

Microlubrication technology significantly improves lubrication performance and heat dissipation during metal cutting by spraying atomized oil droplets around the surface of workpiece to form a uniform film. Therefore, it is great significance thoroughly investigate effects viscosity characteristics inclination angle wall on dynamic behavior impacting inclined wall. The process viscous wetted was observed analyzed through high-speed camera experiments, with aim investigating droplet...

Numerous studies have focused on designing and fabricating functional interfaces that control movement behavior of underwater gas bubbles, which are ubiquitous in a variety natural industrial settings. Nevertheless, developing surfaces with situ tunable bubble remain elusive because current complicated tuning strategies the specific materials. Inspired by pitcher plant rice leaves, here we report kind slippery lubricant-infused anisotropic microgrooved surface (SLI-AMGS) fabricated...

Based on the classical Robbins–Joanny model of contact angle hysteresis, a new dimensionless parameter (q0/q2) sensitive to roughness power spectrum is proposed be linearly related (1) hysteresis caused by heterogeneity and (2) lateral adhesion strength sliding water bridge. Both hypotheses were validated using liquid bridge experiments random rough surfaces. q0/q2 qualitatively reflects decay rate any two points surface from mutually independent correlated with diminishing separation distance.

Control over the generation of air cavities in liquids is vitally important numerous underwater marine systems, with behaviors ranging from largely reducing fluid resistance to minimizing energy consumption. However, critical velocity cavity simultaneously on both original and hydrophobic materials can be mutually exclusive. In strong contrast view that surface wettability what determines entrainment, we report a facile method dramatically reduce by etching kind biomimetic microstructure...

In this work, we reported a kind of deflecting air cavity generation strategy by controlling the superhydrophobic (SHB) area occupancy and impact angle water entry. The influence SHB on entry dynamics drag reduction characteristics spheres are also explored through both experimental theoretical analysis. For hemispherically coated sphere, it is found that formed would reach maximum when 90°. With increasing angle, deflection displacement sphere in horizontal direction first increases then...

Reducing fluid frictional drag at the solid–liquid interface is a promising strategy for improving hydrodynamic properties of structure in water, though so far it has remained unattainable without robust air cavities. Herein, we report durable generation cavity on rough microstructured surface, which could achieve stable reduction even after 2000th water entry test. It worth noting that almost independent wear surface microstructure, as worn microstructures still keep morphology and would...

The pinning dynamic of oil droplet on micropore surface has a significant impact the stability film. Herein, numerical model generated in situ at orifices is established. influence pore parameters and inlet pressure movement three‐phase contact line are explored. transformation mechanism between spreading revealed. result shows that due to competition tension driving force, flow field point become unstable. Until unpinned, spreads surface. With reduce angle or increase diameter pore, time...

Purpose The lubricating fluid stored in the porous matrix will spontaneously exude to supplement film damaged area, thus ensuring long-term self-lubricating function of surface. To reveal repair mechanism oil film, it is necessary understand flow characteristics micropores. purpose this study guides design micropore structure realize rapid exudation surface and film. Design/methodology/approach In paper, cylindrical orifice, convergent orifice divergent were studied. numerical model...