Aquatic robots can remove contaminant particles from water

Date:
August 10, 2020
Source:
University of Warwick
Summary:
Scientists have developed a 1cm by 1cm wireless artificial aquatic
polyp, which can remove contaminants from water. Apart from
cleaning, this soft robot could be also used in medical diagnostic
devices by aiding in picking up and transporting specific cells
for analysis.



FULL STORY ========================================================================== Corals in the Ocean are made up of coral polyps, a small soft creature
with a stem and tentacles, they are responsible for nourishing the corals,
and aid the coral's survival by generating self-made currents through
motion of their soft bodies.


========================================================================== Scientists from WMG at the University of Warwick, led by Eindhoven
University of Technology in the Netherlands, developed a 1cm by 1cm
wireless artificial aquatic polyp, which can remove contaminants from
water. Apart from cleaning, this soft robot could be also used in medical diagnostic devices by aiding in picking up and transporting specific
cells for analysis.

In the paper, 'An artificial aquatic polyp that wirelessly attracts,
grasps, and releases objects' researchers demonstrate how their artificial aquatic polyp moves under the influence of a magnetic field, while the tentacles are triggered by light. A rotating magnetic field under the
device drives a rotating motion of the artificial polyp's stem. This
motion results in the generation of an attractive flow which can guide suspended targets, such as oil droplets, towards the artificial polyp.

Once the targets are within reach, UV light can be used to activate the
polyp's tentacles, composed of photo-active liquid crystal polymers,
which then bend towards the light enclosing the passing target in the
polyp's grasp. Target release is then possible through illumination with
blue light.

Dr Harkamaljot Kandail, from WMG, University of Warwick was responsible
for creating state of the art 3D simulations of the artificial aquatic
polyps. The simulations are important to help understand and elucidate
the stem and tentacles generate the flow fields that can attract the
particles in the water.

The simulations were then used to optimise the shape of the tentacles
so that the floating particles could be grabbed quickly and efficiently.

Dr Harkamaljot Kandail, from WMG, University of Warwick comments:
"Corals are such a valuable ecosystem in our oceans, I hope that the
artificial aquatic polyps can be further developed to collect contaminant particles in real applications. The next stage for us to overcome before
being able to do this is to successfully scale up the technology from laboratory to pilot scale.

To do so we need to design an array of polyps which work harmoniously
together where one polyp can capture the particle and pass it along
for removal." Marina Pilz Da Cunha, from the Eindhoven University of Technology, Netherlands adds: "The artificial aquatic polyp serves as a
proof of concept to demonstrate the potential of actuator assemblies and
serves as an inspiration for future devices. It exemplifies how motion
of different stimuli-responsive polymers can be harnessed to perform
wirelessly controlled tasks in an aquatic environment."

========================================================================== Story Source: Materials provided by University_of_Warwick. Note: Content
may be edited for style and length.


========================================================================== Journal Reference:
1. Marina Pilz da Cunha, Harkamaljot S. Kandail, Jaap M. J. den
Toonder,
Albert P. H. J. Schenning. An artificial aquatic polyp that
wirelessly attracts, grasps, and releases objects. Proceedings
of the National Academy of Sciences, 2020; 117 (30): 17571 DOI:
10.1073/pnas.2004748117 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/08/200810103314.htm

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