Smart Janus titanium mesh used as a diode for both liquid droplet and air bubble transport

Zhang, Shiming; Zhang, Yuping; Liu, Ming-Lin; Wang, Bingxing; Liu, Pengfei; Bai, Xiuzhi; Cui, Cheng‐Xing; Qu, Lingbo

doi:10.1039/d1nj02998c

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…This would lead to variation in the surface chemistry with depth after UV irradiation, and a gradient of hydrophilicity-to-super-hydrophobicity and an oleophilicity-to-oleophobicity along the mesh thickness would form from the UV-irradiated "front" to "back" surfaces. The oleophilicity-to-oleophobicity gradient profile could be well tailored by the UV irradiation time, which led to the selectivity of the unidirectional liquid transport property [23][24][25][26][27]. The results demonstrated that the super-amphiphobic Ti mesh with one side irradiated by UV at different time is an important engineering material that could be potentially used for large-scale separations of liquid/liquid with different surface tensions.…”

Section: Liquid/liquid Mini-separations Of Ti Meshmentioning

confidence: 95%

Robust Super-Amphiphobic Titanium Surface for Liquid/Liquid Mini Separations

et al. 2022

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Super-amphiphobic surface with low robustness is not suitable for practical application due to its weak mechanical strength. In this work, an in-site growth of micro-/nanoscale flower-like TiO2 on the surface of a titanium mesh was successfully fabricated through hydrothermal synthesis, followed by chemical modification with low-surface-energy heptadecafluoro-1,1,2,2-tetrahydrodecyl trichlorosilane. The resultant super-amphiphobic coating was highly repellent to all of the ethanol–water mixtures with surface tensions ranging over 26.0–72.8 mN/m, as well as excellent chemical and mechanical durability. After it was irradiated for 8 h with ultraviolet light, it was used for oil/water and oil/oil mini-separation with the help of its Janus characteristic. This was attributed to its unidirectional penetration for liquid droplets with different surface tension values. This kind of smart super-amphiphobic mesh with photochemical activity could potentially gate and sort liquids via surface tensions.

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Section: Liquid/liquid Mini-separations Of Ti Meshmentioning

confidence: 95%

Robust Super-Amphiphobic Titanium Surface for Liquid/Liquid Mini Separations

et al. 2022

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“…Evaluation of the wettability was attempted using water drop impact experiments, which were carried out using a Revealer high-speed camera (Fuhuang Agile device, Anhui, China) at a rate of 15,000 frames per second. The Weber number (We) is defined as We = ρRν 2 /γ, where ρ is the density, R the radius of the drop, ν is its impact velocity, and γ is the surface tension of water (Zhang et al, 2021;Lu et al, 2015). The unperturbed radius of the water droplet (10 mL) is r = 1.34 mm, and the impact velocity (ν) was 0.45 ms −1 , corresponding to the We value of 3.72.…”

Section: Fabrication Of the Modified Filter Papermentioning

confidence: 99%

“…However, it is superhydrophilic, which makes its impractical in terms of selectivity. Metal mesh has extraordinary mechanical strength and usually has a large flux for separation of layered oil/water but is less effective at separating surfactant-stabilized emulsified oil because of its large openings [11][12][13]. Polymer-based membranes are highly efficient but not environmentally friendly [14,15].…”

Section: Introductionmentioning

confidence: 99%

Smart Superhydrophobic Filter Paper for Water/Oil Separation and Unidirectional Transportation of Liquid Droplet

Zhang

Wang

Chen³

et al. 2022

Membranes

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Water/oil separation from their mixture and emulsion has been a prominent topic in fundamental research and in practical applications. In this work, a smart superhydrophobic membrane (SHP) was obtained by dipping an off-the-shelf laboratory filter paper in an ethanol suspension of trichloro (1H,1H,2H,2H-tridecafluoro-n-octyl) silane, tetraethyl orthosilicate, and titanium dioxide nanoparticles with different dimensions of 20 and 100 nm. The selection of membrane substrates was optimized including different quantitative and quantitative filter papers with different filtration velocity (slow, intermediate, and fast). The as-prepared SHP was demonstrated to be superhydrophobic and photosensitive, which was used in the separation of carbon tetrachloride and water from their mixture and emulsion. Moreover, orderly aligned micropores were formed for the modified superhydrophobic filter papers by using nanosecond laser. Unidirectional penetration was obtained for the UV-irradiated paper with a bored pore in the range of 50–500 μm in the systems of air/water and water/oil. This study may promote the understanding of unidirectional transportation of liquid droplet and facilitate the design of interfacial materials with Janus-type wettability.

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“…Depending on the stimuli-responsive molecules on the substrate surface, it is possible to design different smart surfaces with a wide range of responsivities toward light, temperature, pH, force, etc. [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Controllable Water Penetration through a Smart Brass Mesh Modified by Mercaptobenzoic Acid and Naphthalenethiol

et al. 2022

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In this paper, a novel pH-responsive brass mesh modified by 3-mercaptobenzoic acid (MBA) and 2-naphthalenethiol (NPT) was demonstrated via a facile chemical etching method followed by surface modification. The smart wettability was dependent on the assembled MBA and NPT with suitable thiol proportions. The on–off control of water penetrating intelligently into the nanostructured brass mesh substrate was carried out by the pH change in the outside environment. The brass mesh modified with XNPT = 0.4 (mole fraction of NBT in the mixed solution) exhibited the strongest pH responsivity from superhydrophobicity to superhydrophilicity. Furthermore, the resulted Janus membrane (JM) fabricated by the integration of a smart brass mesh and hydrophobic Ni foam could be used as a water diode in air and liquid systems. Unidirectional penetration for the water droplet was realized by the resulting smart JM with a hydrophobic upper layer and a pH-responsive layer below.

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Smart Janus titanium mesh used as a diode for both liquid droplet and air bubble transport

Abstract: Design and fabrication of Janus interface materials as a diode for both liquids and gases is a great challenge in the field of material science. Here, a Janus titanium mesh...

Cited by 6 publications

References 28 publications

Robust Super-Amphiphobic Titanium Surface for Liquid/Liquid Mini Separations

Robust Super-Amphiphobic Titanium Surface for Liquid/Liquid Mini Separations

Smart Superhydrophobic Filter Paper for Water/Oil Separation and Unidirectional Transportation of Liquid Droplet

Controllable Water Penetration through a Smart Brass Mesh Modified by Mercaptobenzoic Acid and Naphthalenethiol

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