Questions tagged [adhesion]

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19 views

Is wetting or non-wetting property of a liquid due to surface tension or imbalance of cohesive and adhesive forces?

I know that surface tension in a liquid is caused due to the unbalance of cohesive forces applied by neighbouring molecules on similar molecules on free surface of that liquid. When a liquid comes in ...
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10 views

PTFE on liquid mercury friction coefficient

Are there any studies or research been done where I could see what is the coefficient of friction on a PTFE plastic sliding on a liquid mercury base? I found that the friction coefficient for PTFE is ...
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1answer
214 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
25 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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68 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
52 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
80 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?
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1answer
120 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
21 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
124 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 ...
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4answers
12k 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
70 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
80 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
62 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
381 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 ...
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2answers
125 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
55 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
949 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
39 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
225 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
429 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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1answer
548 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
247 views

How does glue work?

How does glue stick things together? Can anyone elaborate?
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1answer
2k 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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52 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
3k views

Any solutions to Veritasium's hydrodynamic levitation?

So this Youtube video has been around for a while now Veritasium Hydrodynamic levitation! . Also this Fluid Mechanics explanation of an object levitated next to an air jet may be related. I just ...
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153 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
96 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
519 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
19 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
30 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
348 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
861 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
103 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 ...
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1answer
901 views

Why is the angle of contact different for a meniscus and a droplet in the same water/glass/air environment?

There's gravity, there's adhesive and cohesive attractive forces. Fair enough, most materials seem to compare water to mercury in capillary tubes when explaining capillary action and above properties ...
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0answers
280 views

Why is fire sticky? [closed]

I've always wondered why it is possible to pick things up with a burning ember if those things also catch fire. The simplest example I know of, or perhaps just common, is the "cherry" falling off a ...
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2answers
802 views

Why is Sticking to Glass a Lower Energy State for Water?

I've recently been seeing a lot of questions about why, when water is poured from a cup, some will dribble down the side. The best answer I've seen so far is that water is in a lower energy state when ...
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1answer
927 views

Wet a paper to make it sticky

If I wet a piece of paper and put it down on another piece of paper it will stick (a little bit) to it. What are the forces involved here (surface tension maybe)? What would be the strength required ...
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4answers
157 views

Why adhesion is stronger at faster peeling rate?

Adhesion is strong at fast peeling rates and weak at slow peeling rate (paper, video; Newtonian adhesive, non-Newtonian adhesive?), i.e. it is rate-sensitive. Why? (source: Meitl et al.: thanks to ...
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0answers
52 views

Capillary bridge force function given volume and distance

Given two surfaces and a fluidic glue with sufficient adhesion, what is the force provided by the capillary bridge provided the cohesive properties of the glue, volume, and distance between the ...
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0answers
48 views

Sticky physics of pasta mixture [duplicate]

When you mix cooked noodles or other "prevailing 1D pasta" like spaghetti with other ingredients like olives, pieces of meat (not minced) etc. you will probably experience the fact, that the mixture ...
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0answers
328 views

How does surface tension and adhesion lead to this phenomenon?

Surface tension is the elastic tendency of liquids which makes them acquire the least surface area possible Adhesion is the tendency of dissimilar particles or surfaces to cling to one another (...
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1answer
491 views

Why don't we include the adhesive and cohesive force while calculating rise in a capillary tube?

The contact angle of a liquid solid interface is explained by saying that the liquid surface must be perpendicular to the resultant of adhesive cohesive and gravitational forces acting on it, since it ...
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1answer
261 views

Paper Napkin Folded

Why folded napkins are better absorbing water than ordinary napkin. I think there must be related to cohesion of water element. Water are captivated between layers because they appeals each other or ...
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0answers
1k views

Can iron filings on a magnet be removed using a stronger magnet?

After some experiments, I had some NdFeB permanent magnets "contaminated" with iron filings, sticking to it's poles surfaces/edges - you may have seen that before. There are some working ways to ...
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1answer
546 views

induction of van der Waals forces

Is there a way to maximize van der Waals forces between two materials, by electrifying one material, thus creating dipoles/instantaneous dipoles and thus creating stronger van der Waals forces? has ...
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5answers
5k views

A cup of water in ZERO gravity

What will happen if I try to pour a cup of water in zero gravity, into another empty cup? Will the water come out of the cup? The adhesive force between the water molecules and the interior of the cup ...
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1answer
249 views

Is it possible to eliminate Van der Waals interactions?

I came to know that the friction force actually depends on the surface contact area due to weak interactions (adhesion due to Van der Waals forces) between the atoms of both materials increasing in ...
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2answers
2k views

What makes a material adhesive (or sticky)?

I currently have a bandage on my arm that isn't sticking to me but definitely sticks to itself. It brought up the question: What makes a material sticky? What's happening on the molecular level? Why ...
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1answer
745 views

Transfer of angular momentum during oblique impact with(out) adhesion [duplicate]

I am solving a problem of 2 identical spherical particles colliding. The impact is oblique. I consider both normal and tangential contact forces. Tangential force is a combination of elastic force ...