News

Researchers mimic how water and wind create complex shapes in nature

No hands required: new study shows how particles can be directed into desired shapes with energy fields and smart algorithm.
Tilannekuvia siitä, miten hiukkaset muuttavat muotoaan prosessin eri vaiheissa niitten alkuperäisestä jakautumisesta lopputulokseen. Kuva: Aalto-yliopisto
Snapshots of a shape formation experiment showing several stages of the process, from the initial particle distribution to the end result. Photo: Aalto University

Intricate natural formations like star-shaped sand dunes or arc-shaped rocks can appear so purposeful in form that it’s easy to wonder whether someone has designed them. Scientists have long recognised that a particular combination of random and chaotic energy fields can, over a long period of time, give rise to these kinds of unique formations that dot our globe. Few, however, have succeeded in replicating Mother Nature’s touch.  
Researchers at Aalto University have now found a way to mimic the natural processes that create complex shapes and landscapes with the help of a vibrating plate and resulting energy fields. The results are published on 22 September 2021 in Science Advances. 

To create the effect, the team distributed up to 100 particles of tiny metal balls – like those used commonly in soldering – onto a silicon plate measuring 5x5 cm. A camera and smart algorithm allowed the team to track and manipulate the particles into desired shapes, like letters of the alphabet, as the plate vibrated, creating nonlinear energy fields.

‘We used the camera to determine the location of the particles, and the algorithm selected the most appropriate vibration frequency to move the particles in the desired direction. The particles move across the plate in a particular direction depending on the vibration frequency, and the same frequency can cause very different directions of movement in different parts of the plate,’ explains Professor Quan Zhou, who leads the research group behind the findings.

The researchers were surprised at how well the smart algorithm was able to predict the movement of the particles at different frequencies, despite the complexity of their movement. The algorithm efficiently minimised the difference between the target shape and actual particle distribution on the plate.

‘The movement of the particle swarm is similar to natural phenomena in which natural materials are shaped by the power of wind and water. The method should work at both smaller and larger scales, and could have many future applications where using hands or tools is difficult,’ says Doctoral Candidate Artur Kopitca.

Typically, manufacturing a product with a particular shape requires a mould or a pair of skilled hands. The researchers believe that their method inspired by nature could be used to sort cells in medical and bioscience research or as an industrial production method.

A key question that remains open, however, is how many particles can be controlled and how the process can be integrated with other systems which have similar dynamic properties, such as turbulent flows.

Professor Zhou’s research group has previously studied the properties of vibrating plates and how they can be used to guide particles along a particular route or towards an end destination. This is the first time that they have attempted to create shapes by mimicking natural phenomena.

The Open Access article published in Science Advances is available here.

See the video moving particles.

Further information:

Professor Quan Zhou
Aalto University
[email protected]
+358 40 855 0311

Doctoral Candidate
Artur Kopitca
Aalto University
[email protected]
+358 44 948 8731

  • Published:
  • Updated:

Read more news

Esiintyjiä tapahtumassa
Press releases Published:

Sustainability Science Days gathers record participation - next year’s theme will be “Breaking the sustainability bubble”

Finland's largest sustainability research and innovation event brought together over 1,500 experts from over a hundred different countries. The event was organized at Aalto University and the University of Helsinki this year in cooperation with the world's largest sustainability congress, SRI.
Vili Lehdonvirta, phóto: Mikko Raskinen, Aalto University
Press releases Published:

Cloud empires: Mapping the geopolitics of data infrastructures

The trend towards hyperscale cloud infrastructures is creating powerful global gatekeepers of computational capability. We must understand the geopolitical implications.
Tiny plant with text aside Unite! Seed Fund 2024
Awards and Recognition, Cooperation Published:

Unite! Seed Fund 2024 awards funding to 13 applications with Aalto's involvement

The Unite! Seed Fund aims to stimulate and support bottom-up proposals by teachers, researchers and students for collaborative activities.
Tutkimuslaitteistoa ja muovihansikkaisiin puetut kädet.
Press releases Published:

Groundbreaking culturing technique reveals crucial mechanics of cancer

A novel cell culturing technique reveals the hidden biomechanics of breast cancer