crystalline & amorphous solids

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9 Terms

1
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crystalline properties

well defined faces & edges

2
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amorphous

  • powder

  • curved surfaces, globular

3
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differences between crystalline solids and amorphous solids (3)

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why are amorphous materials less thermodynamically stable than crystalline forms

they have very high viscosities

5
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what are pharmaceutical uses of amorphous solids (2)

  • used as active ingredient as its more soluble

  • additives

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what is crystallisation?

production of a single component crystalline phase

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crystallisation process

  • supersaturation

  • formation of crystal nuclei

  • crystal growth around the nuclei

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what is supersaturation

formation of a solution containing more dissolved solute than would be present in a saturated solution at max solubility

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how can supersaturated solutions be obtained

  • cooling of a saturated soluton

  • evaporation —————-

  • chemical reaction

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