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Related Concept Videos

Impact01:30

Impact

378
Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
378
Types of Impact01:30

Types of Impact

896
Impacts can be classified in various forms, primarily under two subgroups: central impact and oblique impact. A central impact occurs when two objects collide head-on, possessing opposite velocities aligned along the line of impact. Conversely, an oblique impact occurs when two objects collide at an angle, resulting in a modification of both direction and velocity.
The coefficient of restitution is a metric for understanding the dynamics of impacts. It quantifies the ratio of relative velocity...
896

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Drop impact printing.

Chandantaru Dey Modak1, Arvind Kumar1,2, Abinash Tripathy1,3

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Summary
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A novel drop-on-demand printing method uses hydrodynamic collapse in superhydrophobic sieves to eject single droplets. This technique enables printing nanoparticle suspensions with high mass-loading and large particles, overcoming limitations of traditional inkjet printing.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Microfluidics

Background:

  • Traditional inkjet printing faces limitations in mass-loading and particle size due to nozzle clogging.
  • Superhydrophobic surfaces offer unique fluid manipulation properties.

Purpose of the Study:

  • To develop a novel drop-on-demand printing technique for high-performance material deposition.
  • To overcome the clogging issues inherent in conventional inkjet printheads.

Main Methods:

  • Investigated the hydrodynamic collapse of air-cavities during droplet impact on superhydrophobic sieves.
  • Observed and explained two modes of cavity formation and droplet ejection.
  • Utilized sieve-based technology to replace conventional printhead nozzles.

Main Results:

  • Achieved satellite-free generation of single droplets through a sieve, with droplet volume scaling with pore size.
  • Demonstrated printing of nanoparticle suspensions with 71% mass-loading.
  • Successfully dispensed particles up to 20 μm in diameter within ~80 μm droplets, across a range of fluid properties (surface tension 32 mNm⁻¹, viscosity 33 mPa·s).

Conclusions:

  • The proposed sieve-based printing technique offers a simple, economical, and accessible alternative to existing methods.
  • This approach significantly enhances capabilities for printing suspensions with high particle concentrations and large particle sizes.
  • The findings open new avenues for advanced material deposition and additive manufacturing.