Is there a less technical term for anisotropic? Polarized?
3M tape with anisotropic z-axis electrical conductivity
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Re: 3M tape with anisotropic z-axis electrical conductivity
#42Could this be used for CPU (or some other truckload-of-pins chip) "reballing"? Does it do well under a bolted-on radiator / pressure plate?
For instance, many old Playstation 3 systems go faulty because of the poor quality solder on the CPU/GPU that tends to crack over time. Being a normie, it's really hard to fix something like that at home. But this tape seems like it could save the day.
Re: 3M tape with anisotropic z-axis electrical conductivity
#43What does that mean?
Directly above and below a point on the tape conduct to each other (along the thickness), and no where else.
Re: 3M tape with anisotropic z-axis electrical conductivity
#44The prowess of materials science in companies like 3M and Dupont never ceases to amaze me. Just when I think I've seen it all with fiberglass tape and kapton tape...
Their "prowess" saw DuPont give cigarettes laced with new toxic chemicals they made to their employees to test the chemicals effects. Every human on earth has Dupont chemicals in their blood that will never go away, but accumulate over the course of our lives. These are "forever chemicals" that never break down. When you die you pass them on. They are in the animals you eat, in the beverages and water you drink, they…
That Netflix link is not available everywhere and also quite time-consuming to review. Obviously it is also a dramatic piece rather than a (semi-)scientific. I had a brief look at the PFAS wikipedia page (https://en.wikipedia.org/wiki/Per-_and_polyfluoroalkyl_subst...), which is what that Netflix movie seems to be about, but it's also quite wordy and the claims you make can not be found on there as-is. Maybe you want to consider adding a better source.
Re: 3M tape with anisotropic z-axis electrical conductivity
#45This stuff is rad. I took a class on hardware implants with Joe Fitz a couple years back—on the heels of that wholly unsubstantiated Bloomberg article about China embedding rice grain-sized hardware implants into Supermicro motherboards that magically found their way only to select F100s and gov’t agencies—where we made a PCB to interface an ATtiny85 to an unpopulated UART header on some IoT device but instead of sol…
Yep! But it sadly cannot replace soldering for denser pinout layouts, unless a lot of pressure is applied. Someone tried though;
https://tomverbeure.github.io/2019/11/21/Z-tape.html
(A bit off topic but that Bloomberg story is still such a mystery to me. It went into quite a bit of details and claimed it had tons of sources, so even if it was a completely false story whoever fabricated it must have put insane amounts of efforts/identity fraud into the set up)
Re: 3M tape with anisotropic z-axis electrical conductivity
#46Oof, a roll of this stuff is ~$180
Re: 3M tape with anisotropic z-axis electrical conductivity
#47Earlier quoted context omitted.
It's conductive only in the z-axis. So you can, for example, tape components to your circuitboard instead of having to solder tiny pieces.
I think they were asking… what is the z-axis? What’s the canonical co—ordinate system for tape? You just repeated that it’s conductive in the z-axis.
Yes, z-axis is the direction of the tape's "thickness" so electricity passes only from the thing stuck to the top to the thing stuck to the bottom (directly through the tape) without shorting the rest of the contacts.
I misread the question to be "what makes this 'z-axis' tape" rather than "which axis is the z-axis of the tape".
Re: 3M tape with anisotropic z-axis electrical conductivity
#48Could this be used for CPU (or some other truckload-of-pins chip) "reballing"? Does it do well under a bolted-on radiator / pressure plate? For instance, many old Playstation 3 systems go faulty because of the poor quality solder on the CPU/GPU that tends to crack over time. Being a normie, it's really hard to fix something like that at home. But this tape seems like it could save the day.
There's no way you could have good enough signal integrity. The frequency is high and there's no clever signal processing.
I have never tried it but it seems implausible.
Re: 3M tape with anisotropic z-axis electrical conductivity
#49Is there a less technical term for anisotropic? Polarized?
Anisotropic means “depends on direction”. This tape has conductivity that is different in one direction than the other two directions. This is unique because many materials have a conductivity that is the same regardless of the direction of current flow.
Polarized is not the right word.
Re: 3M tape with anisotropic z-axis electrical conductivity
#50This stuff is rad. I took a class on hardware implants with Joe Fitz a couple years back—on the heels of that wholly unsubstantiated Bloomberg article about China embedding rice grain-sized hardware implants into Supermicro motherboards that magically found their way only to select F100s and gov’t agencies—where we made a PCB to interface an ATtiny85 to an unpopulated UART header on some IoT device but instead of sol…
Yep! But it sadly cannot replace soldering for denser pinout layouts, unless a lot of pressure is applied. Someone tried though; https://tomverbeure.github.io/2019/11/21/Z-tape.html (A bit off topic but that Bloomberg story is still such a mystery to me. It went into quite a bit of details and claimed it had tons of sources, so even if it was a completely false story whoever fabricated it must have put insane amounts…
It was also quite a plausible hack. The faker, if indeed anything was faked, knew more than most. Enough to have done the thing for real.