Questions tagged [adhesion]

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How does a plate stick to a tablemat?

So at my dinner table, I witness this weird phenomenon almost everday. A wet plate if placed on the table mat sticks to it(works better if the plate is made up of steel). I account surface tension and ...
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134 views

What makes silicone sticky?

I've read from 3M's Adhesion Science articles and this StackExchange question that there are three types of adhesion: chemical, physical, and electrostatic. I'm curious about what makes silicone ...
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How do I quantify an adhesive's ability to stick in contrast to flow?

Let's say you glue a ball to a shovel. How do you quantify this adhesive's and ball's ability to stick to the shovel, moving at different speeds, in air and then while the shovel digs into the ground? ...
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Effect of adhesive on ballistic fabrics

Adhesive is applied to "soft" ballistic fabrics (like kevlar or even fiberglass) in order to decrease bulge when being hit by a projectile. What would be the effect of gluing layers of ...
0 votes
0 answers
41 views

How to transform from a discrete to integral equation?

In this picture, the red curve is an elastic rod that has resistance to bending and extension. I am trying to model the adhesions (contact) between the rod and the substrate (glass): the green dashed ...
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Why does cold icing slide off a warm cake?

As in the title: why does cold icing slide off a warm cake? I've been told that it's because a thin layer at the bottom of the mass of icing interacting with the surface of the cake melts to some ...
2 votes
1 answer
91 views

What are the sealing adhesives for high vacuum system?

Recently, I have a project that needs to use a high vacuum system. During the construction process, I encountered a problem: I need to stick mica or glass to the window of the copper wall (one side is ...
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0 answers
30 views

Is Viscosity due to adhesive forces or cohesive?

So if a non-ideal fluid is in motion, in a siphon for instance, then I completely understand why viscosity could arise due to cohesive forces between the particles. But let's say we drop a metal ...
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1 answer
30 views

Why I require more force to slide covered notebooks over each other with water between them although water work as lubricant?

We have learnt when floor is wet we get slip as it reduce friction and work as an lubricant. But yesterday I take 2 notebooks which are covered by transparent sheet , than I pour little water on one ...
1 vote
1 answer
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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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1 answer
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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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1 answer
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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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1 vote
1 answer
134 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 ...
2 votes
3 answers
78 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 ...
1 vote
1 answer
26 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?
-1 votes
1 answer
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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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1 answer
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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 ...
3 votes
1 answer
58 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 ...
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1 answer
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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 ...
1 vote
0 answers
152 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 ...
0 votes
1 answer
89 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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2 answers
90 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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1 answer
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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 votes
1 answer
285 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 ...
0 votes
1 answer
78 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?
1 vote
0 answers
583 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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2 answers
159 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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1 answer
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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?
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1 answer
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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 ...
0 votes
1 answer
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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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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 ...
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111 votes
4 answers
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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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1 answer
203 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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1 answer
248 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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4 votes
1 answer
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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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2 answers
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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 ...
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2 votes
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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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2 answers
273 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.
1 vote
2 answers
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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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1 answer
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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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0 answers
407 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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1 answer
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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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2 answers
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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 votes
1 answer
838 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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How does glue work?

How does glue stick things together? Can anyone elaborate?
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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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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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2 answers
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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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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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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.