"Can you write with it? But seriously Graphene is only one molecule thick by definition so however they apply it it must be done very carefully. Maybe with teeny tiny tweezers. Maybe the same way Head applies it to their tennis rackets."
Its conductive, so they would most likely electroplate, or use a similar process to apply it.
Assuming it's not all BS I assume that they use an ultrasonic spray process (don't know how you came up with HT ovens regarding this method).
Also, considering the conductive nature of the Graphene I would not be surprised if the cone material receives a static charge in order to better/more uniformely attract the conductive Graphene mist.
Such charges are used with metal as well as ceramic plating, and I don't see why it would not apply here as well.
Otherwise, ask the manufacturer,
Deekay, I too would have been skeptical if there wasn't so much interesting
literature on this most recent use of the same carbon that's in common lead pencils.
Your ideas on application are not unreasonable but a little research will reveal the
unusual and difficult processes involved that I came across to create graphene. That's why I'm very interested in how Magico claims to have coated their driver with graphene.
Graphene is the basic structural element of common carbon based materials, including graphite, charcoal, carbon nanotubes and fullerenes(other molecules of carbon).
It is so strong because the electrical attraction between carbon atoms is very strong and that is the source of strength for both graphene and diamond.
Graphene is basically 2-dimensional graphite. Graphite is soft and slippery because it’s in layers of 2-dimensional carbon atom "sheets" weakly bonded to other sheets of similar carbon.
Graphene is therefore a single "sheet" of carbon atoms arranged in hexagons. The carbon-carbon bonds in the 2-D section of graphite (and thus also graphene) are stronger bonds than carbon atom bonds in diamond, hence the "super" properties of graphene.
Graphene is right now rather difficult to make - it was literally discovered by putting a piece of scotch tape on graphite, carefully pullling up the tape leaving a single layer of graphene.
https://en.wikipedia.org/wiki/Graphene_production_techniques <--- This should answer questions as to how one would apply Graphene to a speaker driver. It $ur€ won't b€ ¢heap....
"Graphene is right now rather difficult to make - it was literally discovered by putting a piece of scotch tape on graphite, carefully pullling up the tape leaving a single layer of graphene."
Huh? Rather difficult? Sounds pretty easy to me. If it was difficult it wouldn't have been discovered accidentally. Tons of DIY videos on YouTube for the avid tweaker.
Thanks joeylawn butthat link didn't offer me any idea to explain the statement I read - that Magico 'was putting a layer of graphene' on the driver. Perhaps the comment was in error, a misunderstanding; and Magico is simply adding graphene particles or flakes to the slurry they use fabricating the driver material. That's the common usage.
The problem with graphene is it's basically a 2-dimensional substance, and that's not the most stable state for a substance to be in - it will tend to "curl up" into the more stable 3-dimensional state, unless special methods are used, like stated in the Wikipedia article.
Sort of related, B&W put a coat of diamond on some of their tweeters, I'm guessing using chemical vapor deposition.
Graphene in by itself is highly limited but when combined with others, its enhancements become notable. In the case of the carbon fiber for the driver, its more likely to be added to the resin solution used in the forming cone and fills in gaps in which remaining resin would typically remain. My expectation is the stiffer cone aided in pushing the cone breakup a bit further out.
The issue that remains crucial with graphene is methods of its application. A few years of experimentation were required to optimize the application of graphene to improve rubber products such as tires and shoe soles. In rubber tires, it resulted in improved strength in the rubber without reducing other performance areas like compound grip. In some respects, it improved grip performance as the lattice aided in maintaining is structural shape of the tread pattern under load. This is often called tread squirm.
BAC's wheels used on their Mono race car and some experimental bike frames achieved a 20% reduction in overall mass without loss of overall modulus of the finished product. You might even see its application in cabinets construction that use composite materials at some point.
This in addition to the broadened use of pitch based carbon fiber still leaves some development to take place in material science.
Mmeysarosh I followed up on your comments and found it very interesting
how the graphene helps tire performance in a number of ways. It could find interesting application in ultra high power dragsters where sidewall wrinkling wastes power. I think it will ultimately
be useful in a number areas in audio,particularly in cones and domes,perhaps competing with diamond, and also maybe even in providing more precision in the rubber surrounds.and as an extreme performance surround material.
I agree with Geoff’s comment about the 200x factor. (Gee, that’s the second time in a week I’ve agreed with him :-))
As can be seen in this Samsung press release the 200x factor applies to "electron mobility," not to signal transmission speeds. As can be seen in the Wikipedia writeup, electron mobility is defined as the ratio of electron drift velocity to the strength of the electric field which causes that electron drift. As was recently discussed here in the Cerious Technologies thread electron drift velocity is **vastly** slower than signal propagation.
Basically, what Samsung is envisioning is that the use of graphene can potentially lead to integrated circuit devices, such as computer CPUs and other microprocessors, that internally are much faster than what can be achieved with traditional technologies.
With manufactures expressing that success with graphene is very dependent on application, some time and experimentation will likely be required.
It may have a benefit in speaker driver surrounds as its structure in rubber aid in rebound. We've also seen carbon epoxy implementations that may add to driver diaphragms that are carbon composite. Likely reduction in distortion and further frequency response range before breakup. Some speaker cabinets may benefit with its application.
It was thought that graphene could be use in voice coil as yarn had been recently developed, but now that stanene outed as graphene's tin derived cousin and it shows now resistance at all until 100C, it may become bypassed as a conductor.
The Mat-Sci lab is going to be an interesting place be and I have little doubt some will end up in audio products at some point. Might be a bit until affordability makes it more than just a lab experiment though.
Mmeysaroch. Very interesting. I think distortion reduction and the extended
frequency response w/o breakup would be terrific benefits. Luckily there's so much research going on I think we'll get products fairly soon (not the current products that advertise graphene but are probably using plain old graphite ; as there's no explanation about their manufacturing processes-which have to be discussed to be believed).