[TheForge] plastic forge? OT:

[Bruce Freeman]

Yes, there was some such technique, but I don't recall whether that
produced single layers.

On Thu, Jun 16, 2011 at 12:44 PM, peter fels <artgawk at thegrid.net> wrote:
> PS
> I recall that the method of pulling of single layers of graphene involved simply using tape.
> Think i saw a reference to graphene's being transparent?
>
> On Jun 16, 2011, at 9:38 AM, peter fels wrote:
>
>>
>>>
>>>
>>>
>>> As you probably know, diamond is crystalline carbon, in which each
>>> atom is connected to four others in a tetrahedral configuration (i.e.,
>>> the OTHER four carbons are at the corners of a tetrahedron).  Very
>>> strong, very hard, no free electrons so completely transparent.
>>>
>>> By contrast, graphite is crystalline carbon, in which each atom is
>>> connected to only three others in a hexagonal array (i.e., honeycomb
>>> or chickenwire shape).  This is even stronger than diamond within the
>>> plane.  However, the myriad of layers of carbon are only held together
>>> by their electronic interaction and whatever stuff that attracts to
>>> between the planes.  There are LOTS of loose electrons floating
>>> around, so virtually any wavelength of visible light can be absorbed,
>>> rendering the stuff black.
>>>
>>>>>> How fascinating.
>> Bruce, do you know why free electrons absorb light?
>> Does this mean that running a small current through or across a transparent  material will male it opaque?
>>>>>>
>>>>>>>
>>>>>>>
>>
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-- 
Bruce
NJ