Fabrication of Magnetic Responsive Surface with Multiscale Microstructures by Electrostatic Air Spray Deposition

doi:10.3901/JME.2022.09.298

Abstract

Abstract: The work aims to propose an electrostatic air spray method for preparing magnetic responsive superhydrophobic surface with multiscale microstructures to apply to microfluidic field. The mixture of micron-scale carbonyl iron powders and PDMS (Polydimethylsiloxane) is sprayed onto the substrate surface in a magnetic field to construct magnetic responsive superhydrophobic surfaces. After thermal curing, they are sprayed nanoscale carbon powders by respectively controlling the spray time to fabricate samples. The microstructure morphology is analyzed by a scanning electron microscope (SEM) and a digital microscope. The hydrophobic characteristics are measured by a contact angle measurement. The adhesion properties are tested by the contact and collision between the droplet and the surface. The droplet driven and directional distribution of the droplet were realized based on the surface characteristics. As a result, the surface with different microstructures shows different morphologies and properties. Spraying carbon nanoparticles can significantly improve the surface hydrophobicity and reduce the surface adhesion. The magnetic responsive surface with multiscale microstructures can be prepared simply and effectively by electrostatic air spray deposition. The prepared surface has excellent superhydrophobic properties and extremely low adhesion to achieve different droplet manipulation, showing a wide application prospect.

Key words: electrostatic air spray, magnetic responsive, superhydrophobic, multiscale microstructure surface, droplet driven

CLC Number:

TG58

CHEN Fengjun, XIANG Wang, HU Tian. Fabrication of Magnetic Responsive Surface with Multiscale Microstructures by Electrostatic Air Spray Deposition[J]. Journal of Mechanical Engineering, 2022, 58(9): 298-306.

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