How can a powder be turned into a solid?

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Offline thedoc

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How can a powder be turned into a solid?
« on: 16/01/2014 18:30:02 »
bradley beasley asked the Naked Scientists:
I would like to know how to turn a powder into a solid? This is a consumable item that would dissolve in water.

Thank you in advance.

What do you think?
« Last Edit: 16/01/2014 18:30:02 by _system »


Offline CliffordK

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Re: How can a powder be turned into a solid?
« Reply #1 on: 16/01/2014 22:06:17 »
A lot would depend on what the powder is. 

Sugar or salt could be melted and solidified into a solid, or it could be dissolved in water, or your favorite solvent, and then crystallized out of the water by letting the water evaporate or mixing in the solute at high temperatures, then forcing it to become super-saturated and crystallize by reducing the temperature (possibly seeding the crystals).

Some substances might make concretions better.  For example Flour will not melt or dissolve without significantly changing it.  You could add a little water, make a slury, then dry, somewhat like is done with concrete.  You can also add something to aid with it sticking together like honey.

Medications can be crystallized, but it may be easier for the manufacture to make a kind of concretion, and it may also lead to better bio-availability due to be easier to dissolve, although extending the digestive period may not be bad for some meds.  And, of course, getting uniform dosing.