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Teflon polymer is a hydrophobic material with a contact angle of 120. Casting technology allows one to achieve the lotus effect by modifying the surface with microgrooves of width 0.5 micrometres. Estimate the effective contact angle if 1,000 grooves per centimetre have been imprinted. What is the expected contact angle if 10,000 grooves per centimetre are imprinted?

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