By courtesy of:
Joerg Lahann, Samir Mitragotri, Thanh-Nga Tran, Hiroki Kaido, Jagannathan Sundaram, Insung S. Choi, Saskia Hoffer, Gabor A. Somorjai, Robert Langer
Science, 2003, 299, 371
and
Two-Level Structured Self-Adaptive Surfaces with Reversibly Tunable Properties
Sergiy Minko,* Marcus Muller, Michail Motornov, Mirko Nitschke, Karina Grundke, and Manfred Stamm
JACS, 2009, 125, 3896