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Ultrastrong adhesion of graphene membranes

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As mechanical structures enter the nanoscale regime, the influence of van der Waals forces increases. Graphene is attractive for nanomechanical systems1,2 because its Young's modulus and strength are both intrinsically high, but the mechanical behaviour of graphene is also strongly influenced by the van der Waals force3,4.

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Dynamic mechanical behavior of multilayer graphene via supersonic projectile penetration

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Multilayer graphene is an exceptional anisotropic material due to its layered structure composed of two-dimensional carbon lattices. Although the intrinsic mechanical properties of graphene have been investigated at quasi-static conditions, its behavior under extreme dynamic conditions has not yet been studied.

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Thorstein: To which degree can the Si-graphene vdW interactions investigated here be generalized to say something about graphene interactions with other substrates?

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Thorstein: To which degree can the Si-graphene vdW interactions investigated here be generalized to say something about graphene interactions with other substrates?

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Peter: another thing you should all think about is what the experiment says about the graphene sheets permeability

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Peter: another thing you should all think about is what the experiment says about the graphene sheets permeability

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1) They use a different youngs modulus? 

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1) They use a different youngs modulus? 

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2) Did the authors explain why the Zong paper gave so much lower adhesion energy... ?

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Is the strong adhession because of the SiO2 substrate?  We have been told VdW heterostructures are are weakly binding to each other, so this adhession must be comming from the binding to SiO2 and be heavily dependent on substrate?

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Is the strong adhession because of the SiO2 substrate?  We have been told VdW heterostructures are are weakly binding to each other, so this adhession must be comming from the binding to SiO2 and be heavily dependent on substrate?

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Aleksander

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Cool idea: maybe also use the graphene to heat the gas - and make confined nanochemistry experiments...

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Cool idea: maybe also use the graphene to heat the gas - and make confined nanochemistry experiments...

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Sounds a bit like what Peter Vesborg in Surfcat is doing.

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1.       Is there a better way to measure the samples than using standard AFM? – From the graphs, it shows that the AFM may not capture small delamination effects.

2.       How does this method agree with theory compared to other methods of measuring adhesion?

3.       What parameters could improve theoretical predictions?

4.       What could be the reasons for the higher adhesion of monolayers compared to few layer graphene?

5.       What is the advantages of using CVD graphene over exfoliated graphene in a study like this?

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Please note : impact factor of Science is 41, not 41000...:) 

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Please note : impact factor of Science is 41, not 41000...:) 

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Peter B: how do you guys think amorphous BN would perform?

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Peter B: how do you guys think amorphous BN would perform?

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What was the physical explanation and relavance behind the crack angles and lengths vs number of petals 

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What was the physical explanation and relavance behind the crack angles and lengths vs number of petals 

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(GR3)

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It's nice to have this less formal setup for discussions

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Pros: The zoom room switching went more smoothly today, and the talks were interesting. Journal club works  nicely, I thought both presentations were good but particularly Joachim's was fantastic.

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Pros: The zoom room switching went more smoothly today, and the talks were interesting. Journal club works  nicely, I thought both presentations were good but particularly Joachim's was fantastic.

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Cons: Maybe more communication between the presenter and reviewer prior to the lecture so that it can flow more smoothly
-Thierry

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I particularly liked the break-out room session after the presentation.

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- 25 min for the presentation and an hour for the whole session is very well divided.
- Break-out rooms for the last presentaion worked very well.

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No complaints, nice talks and presentations. Maybe allocate a bit more discussion time, if possible.

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The journal-club discussions were very interesting, and I wish we could have spent more time on them, as my brain was more active during, as opposed to the talks.

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The concept of paper presentations itself between peers, makes for easy understanding and insight into methods.

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The concept of paper presentations itself between peers, makes for easy understanding and insight into methods.

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Four hours of straight presentations is a bit much though.

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I believe the discussion after the presentation in breakout rooms was a nice idea.

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Pros: Students' presentations are very structured and clear

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Pros: Students' presentations are very structured and clear

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Cons: Maybe some background materials relating to papers, so reading them will be more rewarding?

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So far so good.

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Pass

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The journal-club works really well and is a great change of pace