[TheForge] plastic forge? OT:

[peter fels]

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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