Dropwise condensation on a hydrophobic probe-tip for manipulating micro-objects

Fan, Zenghua; Wang, Lefeng; Rong, Weibin; Sun, Lining

doi:10.1063/1.4913849

Cited by 19 publications

(12 citation statements)

References 19 publications

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“…The shape of the liquid droplet was changed by adjusting the relative position of each needle, resulting in the micro-components tilting and their rotation. Fan et al [ 8 , 9 ] proposed a capillary gripping method based on dropwise condensation to guarantee real-time droplet formation. Microspheres with 40–200 μm diameter were grasped reliably using a single-probe capillary microgripper with hydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

Capillary Forces between Concave Gripper and Spherical Particle for Micro-Objects Gripping

et al. 2021

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The capillary action between two solid surfaces has drawn significant attention in micro-objects manipulation. The axisymmetric capillary bridges and capillary forces between a spherical concave gripper and a spherical particle are investigated in the present study. A numerical procedure based on a shooting method, which consists of double iterative loops, was employed to obtain the capillary bridge profile and bring the capillary force subject to a constant volume condition. Capillary bridge rupture was characterized using the parameters of the neck radius, pressure difference, half-filling angle, and capillary force. The effects of various parameters, such as the contact angle of the spherical concave gripper, the radius ratio, and the liquid bridge volume on the dimensionless capillary force, are discussed. The results show that the radius ratio has a significant influence on the dimensionless capillary force for the dimensionless liquid bridge volumes of 0.01, 0.05, and 0.1 when the radius ratio value is smaller than 10. The effectiveness of the theorical approach was verified using simulation model and experiments.

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Section: Introductionmentioning

confidence: 99%

Capillary Forces between Concave Gripper and Spherical Particle for Micro-Objects Gripping

et al. 2021

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“…The additional force can also be developed by inertia, e.g. in [10] where a large vertical deceleration is applied to the gripper, or in [11] and [12] where vibrations are used. The rupture of the meniscus has also been achieved by generating a higher attraction force on the substrate where the release is expected, e.g.…”

Section: Introductionmentioning

confidence: 99%

Pick and release of micro-objects: An actuation-free method to change the conformity of a capillary contact

Iazzolino

Tourtit

Chafaï

et al. 2019

2019 International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS)

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We propose a new 3D printed capillary gripper equipped with a textured surface for actuation-free release. The gripper classically picks up micro-objects exploiting the capillary forces induced by a liquid bridge. Micro-objects are released by decreasing the volume of this bridge through evaporation. This latter can be either natural or speeded up by a heating source (IR laser or Joule effect). The volume reduction changes the topography of the contact (called here conformity) between the gripper and the object. We analyze the gripper performance and rationalize the release mechanism by defining the concept of contact conformity in a capillary context.

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“…The reason why the proposed method is crucial is that it is useful for building 3D constructions, due to its reliable releasing and reliable “disassembling gripping”. Not all of the reviewed techniques presented in this section can be used for 3D assembling, with the exception of techniques [ 13 , 14 , 15 ] and possibly [ 11 , 12 ]. However, without exception, none of the reviewed techniques in this section can be used for 3D disassembling.…”

Section: Introductionmentioning

confidence: 99%

Reliable and Accurate Release of Micro-Sized Objects with a Gripper that Uses the Capillary-Force Method

Uran¹,

Šafarič²,

Bratina³

2017

Micromachines

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There have been recent developments in grippers that are based on capillary force and condensed water droplets. These are used for manipulating micro-sized objects. Recently, one-finger grippers have been produced that are able to reliably grip using the capillary force. To release objects, either the van der Waals, gravitational or inertial-forces method is used. This article presents methods for reliably gripping and releasing micro-objects using the capillary force. The moisture from the surrounding air is condensed into a thin layer of water on the contact surfaces of the objects. From the thin layer of water, a water meniscus between the micro-sized object, the gripper and the releasing surface is created. Consequently, the water meniscus between the object and the releasing surface produces a high enough capillary force to release the micro-sized object from the tip of the one-finger gripper. In this case, either polystyrene, glass beads with diameters between 5–60 µm, or irregularly shaped dust particles of similar sizes were used. 3D structures made up of micro-sized objects could be constructed using this method. This method is reliable for releasing during assembly and also for gripping, when the objects are removed from the top of the 3D structure—the so-called “disassembling gripping” process. The accuracy of the release was lower than 0.5 µm.

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Dropwise condensation on a hydrophobic probe-tip for manipulating micro-objects

Cited by 19 publications

References 19 publications

Capillary Forces between Concave Gripper and Spherical Particle for Micro-Objects Gripping

Capillary Forces between Concave Gripper and Spherical Particle for Micro-Objects Gripping

Pick and release of micro-objects: An actuation-free method to change the conformity of a capillary contact

Reliable and Accurate Release of Micro-Sized Objects with a Gripper that Uses the Capillary-Force Method

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