Super Water-Repellent Surfaces Resulting from Fractal Structure Export

@article{citeulike:3503464, abstract = {Abstract: Super water-repellent surfaces showing a contact angle of 174 for water droplets have been made of alkylketene dimer (AKD). Water droplets roll around without attachment on the super water-repellent surfaces when tilted slightly. The AKD is a kind of wax and forms spontaneously a fractal structure in its surfaces by solidification from the melt. The fractal surfaces of AKD repel a water droplet completely and show a contact angle larger than 170 without any fluorination treatments. Theoretical prediction of the wettability of the fractal surfaces has been given in the previous paper.3 The relationship between the contact angle of the flat surface and that of the fractal surface f is expressed by the equation cos f = (L/l)D-2 cos where (L/l)D-2 is the surface area magnification factor. The fractal dimension of the solid AKD surface was determined to be D 2.3 applying the box-counting method to the SEM images of the AKD cross section. L and l, which are the largest and the smallest size limits of the fractal behavior of the surface, are also estimated from the box-counting method. The contact angles of some water/1,4-dioxane mixtures on the fractal and the flat AKD surfaces were determined, and the values of cos f were plotted against cos . The plot of cos f against cos agrees well with the theoretical prediction. It has been demonstrated by this work that the fractal concept is a powerful tool to develop some novel functional materials.}, address = {Tokyo Research Center, Kao Corporation, 2-1-3 Bunka, Sumida-ku, Tokyo 131, Japan, and Recording and Imaging Science Laboratories, Kao Corporation, 2606, Akabane, Ichikai-machi, Haga-gun, Tochigi 321-34, Japan}, author = {Shibuichi, S. and Onda, T. and Satoh, N. and Tsujii, K.}, citeulike-article-id = {3503464}, citeulike-linkout-0 = {http://dx.doi.org/10.1021/jp9616728}, citeulike-linkout-1 = {http://pubs.acs.org/doi/abs/10.1021/jp9616728}, day = {12}, doi = {10.1021/jp9616728}, journal = {J. Phys. Chem.}, keywords = {fractal, nanostructured, superhydrophobic, surface}, month = {December}, number = {50}, pages = {19512--19517}, posted-at = {2008-11-11 12:17:39}, priority = {2}, title = {Super Water-Repellent Surfaces Resulting from Fractal Structure}, url = {http://dx.doi.org/10.1021/jp9616728}, volume = {100}, year = {1996} }

TY - JOUR ID - citeulike:3503464 L3 - citeulike-article-id:3503464 N2 - Abstract: Super water-repellent surfaces showing a contact angle of 174 for water droplets have been made of alkylketene dimer (AKD). Water droplets roll around without attachment on the super water-repellent surfaces when tilted slightly. The AKD is a kind of wax and forms spontaneously a fractal structure in its surfaces by solidification from the melt. The fractal surfaces of AKD repel a water droplet completely and show a contact angle larger than 170 without any fluorination treatments. Theoretical prediction of the wettability of the fractal surfaces has been given in the previous paper.3 The relationship between the contact angle of the flat surface and that of the fractal surface f is expressed by the equation cos f = (L/l)D-2 cos where (L/l)D-2 is the surface area magnification factor. The fractal dimension of the solid AKD surface was determined to be D 2.3 applying the box-counting method to the SEM images of the AKD cross section. L and l, which are the largest and the smallest size limits of the fractal behavior of the surface, are also estimated from the box-counting method. The contact angles of some water/1,4-dioxane mixtures on the fractal and the flat AKD surfaces were determined, and the values of cos f were plotted against cos . The plot of cos f against cos agrees well with the theoretical prediction. It has been demonstrated by this work that the fractal concept is a powerful tool to develop some novel functional materials. IS - 50 JF - J. Phys. Chem. AD - Tokyo Research Center, Kao Corporation, 2-1-3 Bunka, Sumida-ku, Tokyo 131, Japan, and Recording and Imaging Science Laboratories, Kao Corporation, 2606, Akabane, Ichikai-machi, Haga-gun, Tochigi 321-34, Japan EP - 19517 TI - Super Water-Repellent Surfaces Resulting from Fractal Structure VL - 100 SP - 19512 KW - fractal KW - nanostructured KW - superhydrophobic KW - surface AU - Shibuichi, S AU - Onda, T AU - Satoh, N AU - Tsujii, K PY - 1996/12/12/ UR - http://dx.doi.org/10.1021/jp9616728 ER -