The Coffee stain effect Fluids & Soft Matter UvA 2016-12-14 | Get to know why droplets of coffee leave ring-like stains.University of Chicago paper on the coffee stain effecthttp://jfi.uchicago.edu/~tten/Coffee.drops/Nagel.7.4.pdf--------------------------Resources used in the video:Coffee stain imageshttp://www.freeiconspng.com/png-images/coffee-stain-pngMicroscope footage University of Pennsylvaniayoutube.com/watch?v=ZaCGoSTMHycMusic. Bensound - Sunnyhttp://www.bensound.com/royalty-free-music/acoustic-folk
Soft Matter Group - Experimental video collection Fluids & Soft Matter UvA 2024-09-09 | This video presents experimental clips accumulated over the years by the Soft Matter Group, showcasing some key topics such as Fluid Mechanics, Biophysics, Active matter, Crystals and Metamaterials.This video was made for the 2024's Open Days of the University of Amsterdam.
Inkscape training for scientists Fluids & Soft Matter UvA 2023-06-13 | Recording of a training course at the University of AmsterdamBy Antoine Gaillard
Making pancakes with science! Fluids & Soft Matter UvA 2022-06-07 | To make the perfect pancake, the batter must be made right, so that it flows easily enough to make a nice round pancakes but not too easy so that the pancake becomes too thin. In this video, the fluid mechanics behind pancake flow is explained. Made by:Sebastian WalrabensteinFriso EigenhuisSources:youtube.com/watch?v=A0FU7eosjTI&t=1s&ab_channel=DailyIcelandyoutube.com/watch?v=YxHJmCVTMhQ&ab_channel=fluidsin4k
Explaining Laminar Flow Using Balloons Fluids & Soft Matter UvA 2022-06-07 | Pinching a hole in a balloon filled with water creates a perfectly stationary stream of water. Why? In this situation, the flow is laminar, rather than turbulent. What this means is explained in this video. Made by: Jesper Duiker, Bas Tuin and Marieke BruggeSources:Unmixing Color Machine (Ultra Laminar Reversible Flow) - Smarter Every Day 217 (youtu.be/j2_dJY_mIys)I’m So Excited, The Pointer Sisters
How divers can minimize their splash size Fluids & Soft Matter UvA 2022-06-02 | Professional divers can dive from large heights with only a minimal splash when hitting the water. What is the fluid mechanics behind this? Find out more in this video. Made by:Boris Jaspers, Eléa Gomila and Jetske RibbersSources:V0020: The Shape of Splashes; How Diver Geometry Affects Splash Evolutiongfm.aps.org/meetings/dfd-2018/5b9744dcb8ac31610362f338V0065: Splash evolution of a wedge-patterned disk upon water entrygfm.aps.org/meetings/dfd-2019/5d7f606d199e4c429a9b2ff5V0088: Reducing the forces of water entrygfm.aps.org/meetings/dfd-2018/5b9c1fd2b8ac3105e5ac919aV0073: Formation of thick and thin jets by impacting solid bodygfm.aps.org/meetings/dfd-2017/59bb40a0b8ac316d38841f17V0033: water entry of sphere: splash, cavity and jetgfm.aps.org/meetings/dfd-2015/55f5266469702d060d400300V0106: Slamming and Slapping: the story of a diving wedgegfm.aps.org/meetings/dfd-2016/57daeb64b8ac311791000a95youtube.com/watch?v=8GqWTqDhahM
The Jamming Transition Fluids & Soft Matter UvA 2022-05-30 | Do you know what foams, sugar, traffic jams and crowds have in common?Their behaviour is controlled by a phenomenon called 'jamming'. How this works is explained in this video. Source :Car traffic simulator :https://traffic-simulation.de/ring.htmlMade by:Danielle , Lars and Dan
Pluronic Gel Fluids & Soft Matter UvA 2022-05-30 | Pluronic is a material which shows self-assembly and gelation upon increasing the temperature. How this works, you can find out in this video. Sources (in order or appearance):youtube.com/watch?v=SblKax4sY6c (footage)doi.org/10.3390/ma5050966 (images)youtube.com/watch?v=DcUtKiAsuUQ (footage and content)Made by:Isaac DeenLena SpaanBoaz van Carsten
On the tactile perception of friction in humans and robots - Michaël Wiertlewski (Delft Haptics Lab) Fluids & Soft Matter UvA 2022-03-18 | Seminar of Michaël Wiertlewski (Delft Haptics Lab) during the Soft Matter Group meeting on Friday March 18th 2022, University of Amsterdam.Michaël Wiertlewskihttps://delfthapticslab.nl/cpt_people/michael-wiertlewski/Soft matter group:https://iop.fnwi.uva.nl/scm/
Supercooled Water | How Does Water Freeze? Fluids & Soft Matter UvA 2021-10-31 | Supercooled water is liquid even though it is cooled below 0oC. As it turns out, if the water is pure, it doesn’t spontaneously freeze below 0℃. How does tap or rain water freeze then? This happens because of something called nucleation. You can find out what that means in the video!Authors: -Bas Gerritsen- Duncan Pelan- Pim van den Heuvel - Stijn Wouda-------------------------------------------------Musics:- Jake Chudnow- For You- Jake Chudnow- Darwin- Jake Chudnow- Moon men- Jake Chudnow- Dustin Grieber
The strange behavior of a cornstarch suspension Fluids & Soft Matter UvA 2021-10-31 | In this video we explain the physics behind the strange behavior of a cornstarch suspension, also known as Oobleck. This suspension is a Non-Newtonian fluid. We focus on its shear thickening and viscoelastic properties. Apart from the macroscopic properties we also discuss its "microscopic aspects”.
Physics of Coffee: the coffee stain effect Fluids & Soft Matter UvA 2021-10-31 | In this video, we dove into the physics of coffee. To physicists, or just to those who enjoy life in general, there’s no need to explain the importance of coffee. We briefly look into coffeemaking, after tackling the main issue; what is up with this weird ring around coffee stains? Might the effect have anything to do with coffee "strength"?Authors: Joseph van der Heyde, Bram van der Velde, Emiel Claasen
The Percolation Model Fluids & Soft Matter UvA 2021-10-31 | In this video we explore the percolation model and its application to the Flory-Stockmayer theory. We have implemented the model in a python script and derived several results from it, in particular we obtained the percolation threshold, which is a vital ingredient for the Flory-Stockmayer description of gelation.Authors: MerijnMoody & ZierMensch-------------------------------------------Music: Autumn leaves - Bill Evans, Scott LaFaro and Paul Motian videos: Samsara - Ron Fricke
The Ouzo Effect Fluids & Soft Matter UvA 2021-10-31 | This movie gives an explanation of The Ouzo Effect. This is a well-known effect in soft matter physics and occurs in different kinds of alcohol: most famously in Ouzo, a Greek specialty. In short, the ouzo effect illustrates the spontaneous nucleation of oil droplets in liquids. Our movie illustrates the physics behind this process and explains why the Ouzo transforms from transparent to cloudy. We also illustrate it with an up close shot of an Ouzo-droplet. Authors: Tijs Stoof, Titus Veit, Britt Meijer, Lisa Lenstra
The Mentos-Cola effect Fluids & Soft Matter UvA 2021-10-31 | This video explains the origin of the so-called "Mentos effect" when a candy is added into a cola drink.
The Cheerios Effect Fluids & Soft Matter UvA 2021-10-31 | The cheerios effect is the phenomenon where cheerios seem to clump together with each other or against the edge of the bowl. This effect is a result of the interplay between gravity, buoyancy and the surface tension. We also look into a case where nature has harnessed this effect. Authors: Martijn van Hamersveld, Noud Hover, Steven Levelt & Merlijne Ott.----------------------------------------------Sources:-Vella, D., & Mahadevan, L. (2005). The “cheerios effect”. American journal of physics, 73(9), 817-825.-Bezjak, G. (2010) The “Cheerios effect”. -Vella, D. (2015). Floating versus sinking. Annual Review of Fluid Mechanics, 47, 115-135.
The Tubeless Siphon Fluids & Soft Matter UvA 2019-12-10 | The strange dynamics of a non-Newtonian fluid can be shown with a tubeless siphon. The tubeless siphon is created by using a 1% polyethylene oxide solution (PEO) and a syringe or stirring rod. Further readings: - "Exceptional properties of semi-dilute solutions of nanoparticle laden polymers in water" pdfs.semanticscholar.org/c480/a89fbbfd11e69a44cca28c3b74c509da857b.pdf- "Tubeless Siphon FlowofRoom Temperature Liquid Metal" arxiv.org/ftp/arxiv/papers/1810/1810.03354.pdf Music: Coati Mundi - Prisoner Of My Principles
Time Reversibility In Low Reynolds Number Flows Fluids & Soft Matter UvA 2019-12-10 | In low Reynolds number flows, the Navier-Stokes equation can be simplified to the Stokes flow, which has time reversibility. This means that organisms that move with reciprocal motion (that looks the same forward and backward in time) will not be able to move forward. We demonstrate this with two experiments: one with two plastic swimming fish in water and in glycerol, and one with colored dye in a rheometer. Used music: "Creative minds" from bensound.com Used movies: "Swimming Scallop" from Benticcanada
The Plateau-Rayleigh Instability Fluids & Soft Matter UvA 2019-12-10 | In this video we will try to explain the Plateau-Rayleigh Instability effect to you. For this, we will look at the different factors and equations that influence this effect, such as surface tension and inertial energy, and the Young-Laplace and dispersion relation equations.Used music/movies: Stock footage movies and images, and images used from articles 'Rayleigh-Plateau Instability: Falling Jet Analysis and Applications' by Oren Breslouer, 'Experiments on the capillary instability of a liquid jet' by R.J. Donnelly and W. Glaberson
MeTro Hydrogel Fluids & Soft Matter UvA 2019-12-10 | MeTro, an exciting new innovation, is a pre-polymer synthesized by using re- combinant human tropoelastin and methacrylic anhydride. Used together with photoinitiators and activated by UV-light, MeTro prepolymers form a hydro-gel. The high elasticity and tensile strength of the MeTro hydrogel show its potential for sealing and repair of elastic tissues. In short, MeTro is a non-toxic intracorporeal UV-activated surgical glue.Used Movies:University of Sydney, Engineering a highly elastic human protein{based sealant for surgical applications, Nasim Annabi, Yi-Nan Zhang, Alexander Assmann et al, Science Translational Medicine DOI:10.1126/scitranslmed.aai7466 URL: youtube.com/watch?v=OpGFzy55yV4
Metamaterials and Poisson’s ratio Fluids & Soft Matter UvA 2019-12-10 | In our movie we introduce metamaterials and their purpose. We are in particularly interested in metamaterials with a negative Poisson’s ratio. We first explain what the Poisson’s ratio is and what it means for an object to have a negative Poisson’s ratio. We therefore show videos in which we compress 3 objects, with positive Poisson’s ratio, zero Poisson’s ratio and a negative Poisson’s ratio respectively. Then we give a few examples of the use of a negative Poisson’s ratio in metamaterials.Used videos: -Wave propagation in negative index metamaterial - Valentin Vinoles youtube.com/watch?v=64_LVOrEGt4 -How Does This Invisibility Cloak Work? - Seeker youtube.com/watch?v=wxH1rmOTpFA -Self-guided shape-changes in metamaterials - Science Animated Coulais, C., Sabbadini, A., Vink, F. et al. Multi-step self-guided pathways for shape-changing metamaterials. Nature 561, 512–515 (2018) doi:10.1038/s41586-018-0541-0 youtube.com/watch?v=8m1QfkMFL0I -KinetiX—designing auxetic-inspired deformable material structures - MIT Media Lab youtube.com/watch?v=XP5Fk-lHvK0 -These Metamaterials Go Beyond the Properties of Nature - Seeker youtube.com/watch?v=4H4y5yXXpa0 -Auxetic Polymer Membranes Through Electrospinning - EmpaChannel youtube.com/watch?v=OTRCISS3QfE -Metamaterial Mechanisms (UIST'16) - HassoPlattnerInstitute HCI Authors: Alexandra Ion, Johannes Frohnhofen, Ludwig Wall, Robert Kovacs, Mirela Alistar, Jack Lindsay, Pedro Lopes, Hsiang-Ting Chen, and Patrick Baudisch youtube.com/watch?v=lsTiWYSfPck
The Magnus Effect: How To Score Beautiful Goals Fluids & Soft Matter UvA 2019-12-10 | In this video we show what the Magnus effect is and how it works. We show how this effect is used by athletes in soccer and baseball.Sources:youtube.com/watch?v=77U2AdAVTTM youtube.com/watch?v=EgmQV9sodUA youtube.com/watch?v=_TloaTjLY60 Music: Phillip Glass The hours
The Kaye Effect (Explaining Leaping Shampoo) Fluids & Soft Matter UvA 2019-12-10 | This video gives an explanation how the Kaye effect works and why it doesn’t happen for all fluids. Further it contains self-made videos with a high-speed camera of the Kaye effect. Used Pictures: Leaping shampoo and the stable Kaye effect from Michel Versluis.
The Cheerios Effect Fluids & Soft Matter UvA 2019-12-10 | This video explains the Cheerios Effect. The Cheerios Effect is the phenomenon in which Cheerios floating in a bowl of milk stick to the edges of the bowl or to each-other.Music: The Cheerios Song by untitledentity00 (Youtube channel)
Why is ice slippery? Fluids & Soft Matter UvA 2018-12-12 | Summary of different possible explanations of why ice is slippery.*******************************************************Sources:Used movie: pingu (youtube.com/watch?v=9vF6at5zXQo)References:Molecular Insight into the Slipperiness of Ice, B Weber, Y Nagata, S Ketzetzi, F Tang, W J Smit, HJ Bakker, E H G Backus, M Bonn, D Bonn, Van der Waals-Zeemoan Institute (The Netherlands),Max Planck Institute for Polymer Research (Germany), AMOLF (The Netherlands), 2018.
Soil liquefaction: why the beach can behave like a liquid Fluids & Soft Matter UvA 2018-12-11 | Soil liquefaction is a common feature of sands and soils, where a solid behaves like a liquid in response to an applied stress. This can have dangerous real world consequences. In this video we demonstrate and explain this phenomenon.*****************************************************************************************Sources - MusicDrexciya – Jazzy Fluids [Neptune’s Lair, 1999]Drexciya – 700 Million Light Years From Earth [Grava 4, 2002]
The teapot effect Fluids & Soft Matter UvA 2018-12-11 | The dripping of liquids around solid surfaces in the regime of inertial flows, a situation commonly encountered with the so-called “teapot effect”.******************************************************************Sources:Music: Channel:Andrew Rader ,Title:Beautiful Ambient Space Music Part 3Movies:Channel: Instytut Odlewnictwa, Titel: Wettability and Reactivity of liquid Gd in contact with Al2O3 CeramicsChannel: Charmaine Mossbarger, Titel: Chinese Tea Pouring TricksChannel: Shaun O'Hagan, Titel: Ice Age 3: Dawn Of The Dinosaurs: Scrat's Final Scream (2009)Channel: Elena Kollegina, Titel: Leaking teapotChannel: surfingbert, Titel: Tea Pot Effect
The Elastic Leidenfrost Effect: Bouncing Heat Engines Fluids & Soft Matter UvA 2018-12-10 | This video is the end result of the project for the third-year bachelor course Fluids & Soft Matter at the UvA/VU. It gives an explanation of the elastic Leidenfrost effect with hydrogel spheres. This variation on the regular Leidenfrost effect was described by S. Waitukaitis et al.****************************************************************Souces:-Orbeez link: bol.com/nl/p/orbeez-balletjes-10000-stuks/9200000074682018-Picture of the orbeez: commons.wikimedia.org/w/index.php?search=hydrogel&title=Special%3ASearch&go=Go#/media/File:Hydrogel_st3.jpg-Article by S. Waitukaitis et al.: nature.com/articles/nphys4194-Music: youtube.com/watch?v=52509xgZKDI
The Physics of Slime Fluids & Soft Matter UvA 2018-12-10 | Making slime is a big hype on the internet. In this video, we try to figure out the physics that describes the behaviour of this substance.****************************************************************SourcesJeugd van tegenwoordig ZiltNine inch nails ghosts 1
Nucleation and crystal growth Fluids & Soft Matter UvA 2018-12-10 | In this video we explain the processes of nucleation and crystal growth and talk about a good example of this, namely snowflakes. We explain the difference between homogeneous and heterogeneous nucleation and the difference between non-uniform lateral and uniform normal crystal growth. Furthermore, we explain the physics behind homogeneous and heterogeneous nucleation. ****************************************************************Sources:Crystal Time Lapse (Canon 550D): youtube.com/watch?v=caGX6PoVneU, published by ThunderZTRMMicroscopic Time-Lapse of Growing Snowflake - Vyacheslav Ivanov (2014):youtube.com/watch?v=GlQVkZA5j-A, published by ART KOSEKOMA
Active Matter: Modelling swarming behaviour using the Vicsek model Fluids & Soft Matter UvA 2018-12-09 | The swarming behaviour of birds can be modelled using a set of simple rules called the Vicsek model. In this video, we look at the behaviour of the model for different values of the parameters and find a phase transition is present in the model.********************************************************************Sources:Music: Air Hockey Saloon by Chris Zabriskie is licensed under a Creative Commons Attribution license (creativecommons.org/licenses/by/4.0)Source: http://chriszabriskie.com/vendafaceArtist: http://chriszabriskie.comStock footage from pexels.com, all attribution-free, non-copyrighted footage.Images from wikipedia also under fair use policy.Additional sources:http://web.mit.edu/8.334/www/grades/projects/projects10/Hernandez-Lopez-Rogelio/dynamics_2.htmlnature.com/news/the-physics-of-life-1.19105
The Brazil Nut effect Fluids & Soft Matter UvA 2018-12-09 | You probably have noticed that when you shake a mixture of nuts the Brazil nuts always end up on top. This phenomena is called the Brazil Nut effect. In this effect the bigger particles end up on top, while the smaller particles move to the bottom. The primary mechanisms, segregation by percolation and granular convection, are described using demonstrations and experimental video’s.***************************************************************The demonstrations used in the video:youtube.com/watch?v=wbfV16Ykl4o Percolation video by Dynaflow Research Group BVyoutube.com/watch?v=uAN3Z2Vas6w Granular convection video. (c) Sergey Klishin, Mining Institute, Novosibirsk, RFConvection image no copyright.commons.wikimedia.org/wiki/File:Granular_convection_direction.svgImage segregation by percolationhttps://omnilogie.fr/O/La_s%C3%A9gr%C3%A9gation Image Brazil nuts:balanceblog.bistromd.com/health/healthy-eating/12-high-selenium-foods-their-benefits
The Turbodynamics Bartender Fluids & Soft Matter UvA 2017-12-15 | A scientific analysis of the proper way to enjoy the Greek spirit Ouzo. Discussing phenomenons as liquid liquid nucleation and ostwald ripening.
Fluidized bed Fluids & Soft Matter UvA 2017-12-15 | A fluidised bed is a physical phenomenon occurring when a quantity of a solid particulate substance is placed under appropriate conditions to cause a solid/fluid mixture to behave as a fluid. This is achieved by the introduction of pressurized fluid through the particulate medium, here tiny glass beats. This results in the medium then having many properties and characteristics of normal fluids, such as the ability to free-flow under gravity, or to be pumped using fluid type technologies.
Why do water droplets bounce? Fluids & Soft Matter UvA 2017-12-14 | Ever wondered why a water droplet bounces when it hits a liquid surface, instead of just being absorbed into the liquid?Equipped with a high-speed camera we set out to investigate this curious phenomenon, and combined everything we found into this bite-sized video.
The Weissenberg Effect - Rod Climbing Effect in Pancake Batter Fluids & Soft Matter UvA 2017-12-14 | The Weissenberg effect can be observed when a spinning rod is inserted into viscoelastic fluid. The fluid will start climbing the rod. We will analyze this effect on the example of pancake batter and PEO in water.
The surface tension of a soap surface Fluids & Soft Matter UvA 2017-12-14 | In this short video we will explain the physical cause of service tension and what happens when you add soap to water. We will show the energetic nature of surface tension by means of an experiment done with simple household objects. This video shows a metal bar being pulled along a metal construction purely induced by a force of surface tension.
On the nature of self-healing polymers Fluids & Soft Matter UvA 2017-12-14 | In this video, we'll be looking at the properties of self-healing polymers and the physics behind it all. During this video we'll introduce the subject, look at two experiments. And finally take a look at the theory.
Heterogeneous Nucleation - Supercooled Water and Mentos & Coke Explained Fluids & Soft Matter UvA 2017-12-14 | We take a look at two strange phenomena of which quite some people know about that they happen, but not why they happen. Moreover, they’re actually based on the same thing! Let’s have a look at why these two physical reactions take place!
Cornstarch: bulletproof Fluids & Soft Matter UvA 2017-12-14 | Body armor made out of Kevlar is hard and sturdy, which limits the mobility of the wearer. Research is done to explore the possibility of using shear thickening fluids, like cornstarch, to enhance the protection provided by bulletproof vests. This idea is based on the characteristics of shear thickening fluid. Namely, a shear thickening fluids behaves like a solid when a force is applied within a short timespan.
Prince Ruperts Drop: The Mystery Explained Fluids & Soft Matter UvA 2016-12-14 | This video shows the making, properties, breaking and explanation of the Prince Rupert's Drop.Special thanks to Stefan Kooij for helping us with the practical part.---It’s a good thing that your windscreen isn’t as fragile as your grandmas crystal teapot: Two different kind of materials, but both made of glass.But, there is one glass object that is both extremely brittle and super tough: The Prince Rupert's Drop.
Ferrofluid: how does it work? Fluids & Soft Matter UvA 2016-12-14 | A brief explanation of the properties of ferrofluids, for the University of Amsterdam course "Fluids and Soft Matter''. By Joris Bodin, Fabio van Dissel, Daan Haver and Thijs van Egmond.
Random Packing Density of M&Ms in a Spherical Container Fluids & Soft Matter UvA 2016-12-13 | The comparison of Packing density of Maltesers and M&Ms in a Spherical container.2016 UvA Fluid Dynamics and Soft Matter.
Superhydrophobicity: rolling water droplets! Fluids & Soft Matter UvA 2016-12-13 | A video made by third year bachelor students of the University of Amsterdam, explaining superhydrophobicity.
Can you drown in Quicksand? Fluids & Soft Matter UvA 2016-12-13 | Quicksand, the bane of many a movie hero as well as villain. Can you really drown in it though? And how does it even work? This video provides a concise overview of natural (i.e. water-based) quicksand.This video was made for the Physics & Astronomy B.Sc. 2016 course ‘Fluids & Soft Matter’ at the University of Amsterdam [produced by Nick Boon, Abel Brokkelkamp, Thomas Dodds, Robbert Geertsema, AnneMijn Hijner and Marc van Iersel].Sources:Under the Southern Cross (1938), directed by Guido Brignone, Mediterranea FilmKhaldoun, A., Wegdam, G.H., Eiser, E., & Bonn, D., 2005, Nature, Vol. 437, p. 635Khaldoun, A., Wegdam, G., Eiser, E., & Bonn, D., 2006, Europhysics News, Vol. 37, No. 4, pp. 18-19The film footage of the quicksand experiment was provided by Daniel Bonn.
