Patent ID: 7803432

Claim:
A method of controlling a contact angle of water on a surface of an article, in which the article surface is comprised of a substance being capable of decreasing a contact angle of water by application of energy and the method comprises: (1) a step for releasing a substance for increasing a contact angle of water which provides a surface having a contact angle of water larger than that of the article surface, from a material for controlling a contact angle of water which contains the substance for increasing a contact angle of water, (2) a step for increasing the contact angle of water of the article surface by bringing the released substance for increasing a contact angle of water into contact with the article surface to adhere the substance to the article surface, and (3) a step for decreasing the contact angle of water on the article surface by applying energy to the article to which the substance for increasing a contact angle of water was adhered to release the substance for increasing a contact angle from the article.