Thursday, July 21, 2011

Opalescence

Opalescence는 약간 불투명한 고분산 system에서 볼수 있는 보는 각도에 의존한 색상의 변화성이다. 물질은 투과된 빛에 대해서는 적황색의 나타내며 투과된 빛의 방향에 직각으로 산란된 및에 대해서는 청색광을 나타낸다. 이러한 현상은 opal의 appearance에 따라 이름 지어 졌다 .

Opalescent behavior는 몇가지 정도가 있다. 어떤 경우는 약간의 opalescent phase를 ㅌ통해 볼 수 있다. 더 많고 큰 particle이 있다면, 산란은 더 커지고 particular phase는 더 cloud해 보인다. 어떤 밀도에서는 산란은 너무 커서 물질을 통과하는 모든 물질은 산란되고 더이상 투명해지지 않는다.

대표적은 예는 낮 시간의 푸른 하늘과 해질녁에 적황색의 하늘이다. 다른 예로는 물이 담긴 컵에 약간의 우유를 떨어뜨렸을때이다. 이때 액체는 푸른색을 띄지만 광원을 유리잔을 통해 볼때 이것은 적황색을 띈다. Opalescence는 lustreware pottery에서 사용된다.

http://en.wikipedia.org/wiki/Opalescence

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