Design of a self-cleanable multilevel anticounterfeiting interface through covalent chemical modulation

Materials Horizons, Journal Year: 2023, Volume and Issue: 10(6), P. 2204 - 2214

Published: Jan. 1, 2023

Counterfeit products have posed a significant threat to consumers safety and the global economy. To address this issue, extensive studies been exploring use of coatings with unclonable, microscale features for authentication purposes. However, ease readout, stability these against water, deposited dust, wear, which are required practical use, remain challenging. Here we report novel class chemically functionalizable combination physically unclonable porous topography distinct physiochemical properties (e.g., fluorescence, water wettability, adhesion) obtained through orthogonal chemical modifications (i.e., 1,4-conjugate addition reaction Schiff-base at ambient conditions). Unprecedentedly, self-cleanable coating is introduced develop multilevel anticounterfeiting interface. We demonstrate that fluorescent can be verified using deep learning. More importantly, spatially selective read naked eye via underwater exposure UV light illumination. Overall, results reported in work provide facile basis designing functional surfaces capable independent decryption authenticity.

Language: Английский

---

Excellent Liquid Unidirectional Transport Inner Tilted‐Sector Arrayed Tubes

Advanced Materials Interfaces, Journal Year: 2023, Volume and Issue: 10(25)

Published: June 14, 2023

Abstract Liquid unidirectional transport exhibits critical applications from water harvesting to microfluidics. Despite extensive progress, implementation of liquid that is not subjected the surface tension and injecting velocity also remains a great challenge. Here, tilted‐sector arrayed tube for excellent proposed applies vast width domain velocity. In addition, direction abnormally against tilted structure, in stark contrast traditional understanding along direction. This unique caused by synergistic effects sectors structures, which induce 3D propagation mode as well large Laplace pressure asymmetry between front rear sides liquid. Moreover, antigravity climbing, circuit isolating, chemical reaction controlling can be achieved based on transport. It envisioned design extensively applied microfluidics, lab‐on‐a‐chip devices, biochemistry microreactors.

Language: Английский

---

Dual-Liquid-Diode Janus Mesh with Multisuperwettability for Unidirectional Oil–Water Transportation

ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: 7(22), P. 26086 - 26096

Published: Nov. 8, 2024

Natural biological surfaces enable directional liquid transport and storage due to the specific characteristics surface morphologies. Inspired by these natural mechanisms, it is of interest have materials with an asymmetric energy or structures achieve unidirectional transportation. Herein, a dual-liquid-diode (DLD) Janus mesh superwettability on two sides has been designed via electrospraying, one side being superoleophobic/hydrophilic other superhydrophobic/oleophilic. The DLD was transportation both oil water in opposite direction concurrently, contrast membranes that were developed for single liquid. Oil can unidirectionally pass through without external supply air environments. This unique property enables high flexibility controllable multiphase scenarios. demonstrates promise future applications smart separation, on-demand oil–water delivery, fluid valve technologies.

Language: Английский

---

Bubble Unidirectional Transportation on Multipath Aerophilic Surfaces by Adjusting the Surface Microstructure

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(9), P. 11984 - 11996

Published: Feb. 26, 2024

Comprehending and controlling the behavior of bubbles on solid surfaces is significant importance in various fields including catalysis drag reduction, both industrially scientifically. Herein, Inspired by superaerophilic properties lotus leaf surface, a series asymmetrically patterned aerophilic were prepared utilizing facile mask-spraying method for directional transport underwater bubbles. The ability to undergo self-driven transportation an asymmetric pattern attributed natural tendency move toward regions with lower surface energy. In this work, microstructure demonstrated as critical element that influences characteristic affects energy barrier forming continuous gas film final regions. We classify three distinct bubble behaviors which align different evolution states: Model I, II, III. Furthermore, difference between forms gas–gas merging, gas–liquid microreaction specific destination multiple paths can be easily realized preinjecting region. This work provides new view microevolutionary process diffusion, transport, merging upon contact surface.

Language: Английский

---

Electrically switched asymmetric interfaces for liquid manipulation

Materials Horizons, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

An electrically switched asymmetric interface can be used for direction-controlled liquid transport and fine droplet splitting on anisotropic groove-microstructured electrodes, which is promising in controllable separation microfluidic devices.

Language: Английский

---

Efficient and Highly Stable 3D-Printed NiFe and NiCo Bifunctional Electrodes for Practical HER and OER

ACS Applied Engineering Materials, Journal Year: 2023, Volume and Issue: 1(10), P. 2676 - 2684

Published: Oct. 3, 2023

Considered like a fully renewable and clean energy carrier with the highest density, dihydrogen (H2) constitutes best alternative to fossil fuels for ensuring sustainability of energy. This technologically industrially relevant vector can be produced by water electrolysis that is now widely recognized as an eco-friendly, scalable, carbon-free route. In context, alkaline affordable technology because it allows use transition metals electrocatalysts both hydrogen (HER) oxygen (OER) evolution reactions. Here, combining catalytically active metal alloys (NiFe NiCo) 3D printing technique, namely, selective laser melting (SLM), enables access ca. 25 cm2 microstructured cylindrical electrodes, efficiently promoting HER OER. NiCo found most efficient electrode HER, overpotential 210 mV at 10 mA cm–2. It also stable when studied in operation during prolonged electrolysis, potential change only 40 after 140 h 50 cm–2 (1.25 A). Regarding OER, NiFe shows catalytic activity 300 greatest stability electrolysis-induced 30 mV. Further surface characterization techniques (scanning electron microscopy (SEM), dispersive X-ray spectroscopy (EDS), contact angle measurements, analysis electrogenerated gas bubbles) are used monitor chemical changes get valuable information on bubble dynamics. Interestingly, beneficial enhancing hydrophilicity and/or aerophobicity thus facilitating detachment H2 or O2 bubbles.

Language: Английский

---

Cilia‐Inspired Functional Channels for High‐Speed and Directional PEMFC Drainage

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 12, 2024

Abstract Proton Exchange Membrane Fuel Cells (PEMFC) consist of channels that require efficient drainage for optimum performance. However, it remains a grand challenge to achieve both directed and high‐speed active in PEMFC channels. This greatly limits current Herein, inspired by respiratory cilia, bioinspired structural design strategy is introduced into the channel surface significantly enhance its droplet transport efficiency. Two artificial cilia arrays are fabricated named as plane‐bottom array (PACA) concave‐bottom (CACA) according their respective shapes. PACA demonstrates stable directional transport. The speed reaches high 86 mm s −1 with volumes ranging from 10 20 µL. surpassed CACA. Its 163 50 experimental evaluation diameter sizes shows CACA can be tuned enhancing electrochemical CACA‐8 achieves maximum power density (0.5339 W cm −2 ) at 1.1864 A , representing an 18.70% increase compared conventional work provides promising liquid water PEMFC.

Language: Английский

---

Janus Spherical Robot With Multiple Wettabilities for Droplet/ Bubble Manipulation

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 15, 2024

Abstract The flexible manipulation and directional transport of fluids, including droplets bubbles, are foundational to numerous applications. Fluid based on external field stimulation fixed structures has a wide range applications in both natural artificial materials, such as water collection, electrolysis, droplet energy medical diagnosis, etc. However, bubbles exhibit opposite wettability, the inherent opposition between hydrophilicity hydrophobicity presents significant challenge developing system capable manipulating bubbles. Here, inspired by multiple organisms, magnetic‐actuated Janus spherical robot with switchable wettability driving core or solid‐like slippery surface platform is proposed, which achieves dual programmable Furthermore, can achieve transition from superhydrophobic superhydrophilic within 8 min under UV light. It noteworthy that demonstrates superior capabilities speed carrier volume liquid (bubbles), reach 18 (13) cm s −1 800 (500) µL, respectively. This strategy provides novel reliable method for automated broadens their

Language: Английский

---

Dynamic behavior of floating ferrofluid droplet through an orifice with a magnetic field

Computers & Fluids, Journal Year: 2024, Volume and Issue: 279, P. 106341 - 106341

Published: June 15, 2024

Language: Английский

---

Synergetic optimization strategy of asymmetric wettability and structure for directional droplet transport

Surfaces and Interfaces, Journal Year: 2024, Volume and Issue: 51, P. 104677 - 104677

Published: June 25, 2024

Language: Английский

---