Dynamic water contact angle: the dynamic water contact angleon the wool fabrics with and without ALD coating were carried outunder ambient conditions with a JY-PHb contact angle goniometer(Chengde Yingchuang Co., Ltd, China) by using the dynamic sessiledrop technique. The volume of water droplet was 1 _l. The advanc-ing and receding contact angles (_Aand _R) were calculated fromthe meniscus force when the liquid was inflated and sucked up fromthe sample surface, respectively.
Optical photographs: the optical photographs of water, orangejuice, milk, coffee, tea and coca cola droppings on the wool fabricswith and without ALD coating were measured by a digital camera(Canon, EOS 7D, Japan) after 30 min.