Questions tagged [adhesion]

The tag has no usage guidance.

26 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
11
votes
2answers
732 views

Force problem related to adhesive and bonding

I have two PCBs (printed circuit board), and they are glued by adhesives, as show in the pictures. And the location of the adhesives are indicated on the picture (please notice that NO adhesive is ...
6
votes
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 ...
3
votes
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 ...
3
votes
1answer
265 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 ...
2
votes
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 ...
2
votes
0answers
2k 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 ...
2
votes
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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
0answers
58 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 ...
1
vote
0answers
342 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 (...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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?
0
votes
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 ...
0
votes
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.
0
votes
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.
0
votes
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 ...