Questions tagged [adhesion]

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1answer
37 views

Max allowed size of the pores that would prevent a viscous fluid to pass through

Let us have the following system where we put a viscous fluid from the upper inlet and we want this fluid NOT to enter the lower chamber thanks to adhesion & cohesive forces. What is the max. ...
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1answer
61 views

Why does water follow the spoon's surface?

Why does water follow the spoon's surface? Is the reason surface tension, viscosity effects, a pressure gradient?
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1answer
22 views

Is increased paint adhesion after sanding the result of extra surface area?

Often surfaces are sanded before painting to increase adhesion of paint to the surface. I have never seen an explanation as to why this actually results in much stronger adhesion of paint to the ...
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1answer
42 views

What forces act on a droplets hanging from surfaces?

What are the different forces acting on a hanging water droplet (tension of the droplet itself, surface adhesive forces, meniscus formation, etc)? What is the direction of each force, and how does ...
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0answers
13 views

Force of adhesion of polystyrene microspheres to glass surfaces

I am currently working on determining the force with which polystyrene microspheres suspended in water would adhere to a glass surface. To ensure that my methods would give correct results, I would ...
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3answers
62 views

Why does an elastic tape peel off neatly when stretched?

There is this video about a tape peeling trick trending on the internet. If you have a tape sticking on a paper, it rips off the paper if you perpendicularly pull on the tape. But when you stretch the ...
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1answer
23 views

What is the change if a droplet of water is added to another droplet of water on a flat surface

There is a tiny droplet of water lying on a flat clean surface and I add a droplet of water to the tiny droplet on the surface. How can I explain the change that might occur?
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1answer
29 views

What type of adhesion is at play when dust is collected by water

A washing tower that rains water down through a polluted gas will take up the particulates in the gas. They do this through adhesion, I'm pretty sure. Now, there's apparently 5 types of adhesion: ...
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1answer
6 views

Deformation and Adhesion with Particle Contact Time During Impact

Let's say I have a spherical particle impacting a large flat target (let's say it's a half space) at high velocity. It seems I can approximate contact time during impact by dividing impact velocity ...
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0answers
13 views

Hydrophobic surfaces and free fall

Does a hydrophobic surface, like Teflon or an "oily" plastic entirely repel water droplets when there is no force (such as gravity) forcing the surfaces together - or is there still some ...
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1answer
35 views

How exactly do vinyl "static" clings work?

My son asked me this question today, and for the life of me, I can't come up with a good answer that even convinces myself. Vinyl "static" clings are those decorative pieces of vinyl that ...
2
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1answer
28 views

Does: capillary_action * surface * distance = (force*surface) / area*distance == capillary_energy?

I'm trying to get the hang of the conservation of energy. Looking for that aha moment when it makes more sense that energy is conserved than not. When reading it seems to be a consensus that energy is ...
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0answers
21 views

Maximum weight of bathroom tiles

New to the DIY game, and I seem to have very rapidly forgotten some of my Properties of Materials lectures from my undergraduate. What is the maximum weight tile that a I can risk sticking to my ...
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0answers
151 views

Avoiding snails around potted greenery

I am not sure how a snail "sticks" to surfaces e.g. plastic pot or stone. I suspect that it produces mucus, which then adheres with molecular forces. I would like to know, how does the ...
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1answer
57 views

Why is my window condensation pattern like this?

Looks like a bell curve $3/4$ of the way across. I’m guessing warm air is leaking to the inside, on the bottom, below crest, and also adhering to the edges, preventing temperature gradient needed to ...
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2answers
55 views

Why does glue solidifies when taken out of the container?

When you take a small portion of an adhesive, it solidifies after some time while the other part in the container remains in liquid state. Why does this happen?
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1answer
44 views

Stiction, friction and sticking

If we have two flat surfaces touching each other and apply a force parallel to the surfaces, one may move relative to the other. An example would be a polymer block gliding on another. Dependent on ...
17
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1answer
260 views

Why does pepper not stick to the glass with print inside my pepper shaker?

So I have this pepper shaker made of glass with a print on it: One fine dinner, it ran out of pepper, so I opened the lid to fill it up and noticed a peculiar thing – small particles of pepper dust ...
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1answer
56 views

Why does molten wax stick to surfaces when it soldifies?

In a candle, when wax is molten and cools after. It sticks to the glass surrounding it, why does this happen?
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0answers
267 views

Why don't these water droplets fall? Is it because of the surface tension of the water?

Why don't these water droplets fall? Is it because of the surface tension of water? Under the action of gravity, water tends to fall, so the pressure at the top of the water droplet is lower than ...
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2answers
121 views

FBD with a system with glue

I am trying to understand how Adhesives or glues work. In the process I started thinking of drawing the Free body diagram. What will the FBD look like for the Blocks A, B and the adhesive itself? (I ...
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1answer
105 views

Why can't I scotchtape ice?

I am thinking that the electrostatic force (Van der Waals force) should take effect when I try to tape an ice, but the tape slips. Why does this happen?
4
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1answer
180 views

How to determine adhesive forces between fluid and a surface?

Disclaimer: I work in applied math and have limited background in Physics. Need a bit of help here. Assuming I have a 2D droplet attached to some surface like so: This droplet is also experiencing ...
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1answer
41 views

Energy dissipation and work of adherence force

Assume you are pushing a heavy item. But it's not moving. So there is no work, and there should also be no dissipation of energy $P=F v=0$, since the forces don't work. But we see that it does demand ...
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0answers
422 views

When does water decrease or increase friction?

Water often acts as a lubricant e.g. a wet floor or road, but sometimes the reverse happens e.g. putting on wet clothes. I understand that surface tension is involved e.g. microscope slides sticking ...
107
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4answers
13k views

Why does a sticker slowly peel off, but if it is pulled quickly it tears?

Anyone who has removed a sticker, knows that often they must be pulled off slowly, otherwise they tear. Why is this?
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1answer
141 views

Why is it easier to catch mosquitoes with your hand when your hand is wet?

Recently I've noticed that it's significantly easier for me to catch a mosquito with my hand if my hand is very wet (e.g. from having washed my hands and not yet dried them, or from being in the ...
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1answer
186 views

Is a paste a type of glue?

I just wanted to know the answer to this because of the idea of phases of matter, would a paste (or glue) drying count as a change between the states of solid and liquid?
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1answer
130 views

When putting water on two pieces of paper they bond. Is that due to van der Waals bonds?

I've been wondering what keeps two pieces of wet paper together when in contact. Does water have any adhesive property? Or does it decompose something from the paper and creates some kind of glue? I ...
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2answers
827 views

Adhesion vs Static Friction

I feel like this question should have a simple answer, but I haven't been able to find one anywhere. I hope someone can help: In short, my question is why the force of static friction is so much ...
2
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2answers
174 views

Why does a viscous fluid tends to cling to a solid in contact with it?

My textbook says that a viscous fluid tends to cling to a solid in contact with it, and also gives a consequence of the same: "Dust particles cling to blades of a fan even when it is rotating rapidly."...
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1answer
131 views

Is it possible to you reduce the surface retention of water on a stainless steel surface.

The surface is mechanically brushed. I have already considered hydrophobic surface treatment. Are there any other methods to reduce the adhesion forces between water molecules to the surface.
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2answers
2k views

What is the difference between intermolecular (cohesive, adhesive) and van der Waals force?

I recently learnt that intermolecular force is the force of attraction between molecules and van der Waals force does the same so is there any difference ?
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1answer
40 views

Diminished receptivity of paper to pencil during periods of humidity

Why does paper become less receptive to pencil when it is humid out? I have generally experienced this with a 4B pencil.
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0answers
346 views

Water movement in variable diameter bent capillary?

So, I recently learned that if a capillary tube is bent in an upside down U shape, the meniscus formed will be convex (towards the ground). Furthermore, the height (shown as h) traveled by the water ...
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1answer
743 views

Meniscus in U-shaped capillary?

What does the meniscus look like for a U-shaped capillary? From similar questions, I learned that the total height (labeled as h) reached by the water in the un-bent capillary is less than the total ...
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2answers
680 views

Condition for a liquid to stick to a surface

My physics textbook says that : A fluid will stick to a surface if the surface energy between fluid and solid is smaller than the sum of surface energies between solid air and fluid air. I am ...
5
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1answer
711 views

Why is the no-slip condition not applicable for rarefied gases?

It is written in Wikipedia that at very low pressures the no-slip condition does not hold and there we are given a model for applications though there is no explanation given for the reason this is ...
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1answer
282 views

How does glue work?

How does glue stick things together? Can anyone elaborate?
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1answer
3k views

How do UV light curable adhesives work?

How do UV light curable adhesives (such as Loctite's and Permabond's UV glues) work? What gives them the ability to join two non-porous surfaces such as glass-to-glass, glass-to-metal? Also, do ...
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0answers
55 views

Pierre-Gilles de Gennes and adhesives

Among many other fields, Pierre-Gilles de Gennes is credited with greatly contributing to the science of adhesives. One of the model oft cited is the "viscoelastic trumpet", for example in this ...
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2answers
4k views

Any solutions to Veritasium's hydrodynamic levitation?

So this Youtube video has been around for a while now Veritasium Hydrodynamic levitation! . Also these questions Fluid Mechanics explanation of an object levitated next to an air jet and Explain ...
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0answers
198 views

How does 'static' cling work

I noticed that static cling film does not seem to electromagnetically interact with itself, from which I deduced that it cannot have a static charge. Googling lead me to sites like this one, where it ...
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1answer
106 views

How insects move opposite to gravity? [duplicate]

My question is very simple: How insects move opposite to gravity? please dont tell me that they have Sucks because my comment will be what about insects if move on smooth walls like glass.
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1answer
793 views

How does glue work on the atomic level?

Glue seems to hold together almost all solid things. But on the atomic level, if two things have the same charge they tend to repel. So is it possible to charge glue and a solid with a charge? And ...
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0answers
20 views

What is the term for 'clean fracture vector'?

Today I observed a builder demolishing a wall in a house. He knew how to hit it in exactly the right place, with the right amount of force, for it to cleanly break into three smaller pieces - along ...
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1answer
33 views

What are the possible ways to measure electrostatic adhesion of particle to a substrate?

I am interested to measure the force of adhesion of micron (1-10 micron) sized particles to conducting and insulating substrates. I searched for literature and found Force spectroscopy and tapping ...
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1answer
463 views

Equation for shape of water drop on hydrophobic surface

What would be the general equation of the 3D shape water forms when it "beads up" on a hydrophobic surface such as wax paper?
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2answers
1k views

What limits the top speed in curves?

I was asking myself how it would be possible to set new top speeds on racetracks. I came to the conviction that on most tracks not the vehicle with the highest top speed have the fastest laptime. ...
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1answer
107 views

Diameter Shifting Capillary Tubes

Is there any known material of which to construct a capillary tube that would make it possible to compress the diameter of the capillary tube while maintaining the internal shape? Intent being that ...