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Magnetic, Electrical and Optical properties

How magnetic, electrical and optical properties changes from bulk to nano material? I want theoriatical concept base answer

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    pratheek g hegde

    In nano scale surface to volume ratio increases. Hence surface effects dominate which can be neglected in bulk materials. ex- friction, stiction etc

    this changes certain properties ex- a nano film of gold looks red in colour compared to yellow in bulk size

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