Talk given by
Prof. Dr. Uttam Manna
Department of Chemistry & Centre for Nanotechnology
The biomimicked (lotus-leaf, rose petal, fish-scale etc.)[1,2] special interfaces is emerging
as general avenue to develop several functional materials for various prospective
applications including oil/water separation, anti-corrosive coating, underwater robotics,
protein crystallization, drug delivery, open microfluidics, water harvesting etc. In
common practice, essential chemistry and appropriate topography that conferred the
special liquid wettability is achieve by associating delicate chemistry in the reported
materials and eventually the synthesized materials are suffered from poor durability and
become inappropriate for prospective application in real world scenarios. In the past,
Michael addition reaction is mostly used in synthesis of various important class of small
molecules, biodegradable polymers for drug delivery, functional surface modifications,
anti-bio-fouling coating etc. In last few years, we are strategically exploiting this same
Michael addition reaction between acrylate and amine groups at ambient conditions—in
synthesis of durable and self-healing biomimicked interfaces—without using any
catalyst.[3-6] This simple and robust chemistry is extended in synthesis of flexible
superhydrophobic monolith, control and extreme regulation of both water and oil
wettability in air and under water respectively, fabrication of stretchable lotus-leaf
inspired interfaces, Janus membrane. Moreover this chemistry allows to introduce a
highly scalable biomimicked coating, irrespective of the chemical/physical nature of the
substrates. The synthesized materials are extended in proof of concept demonstration of
oil/water separation-following energy efficient active filtration and selective absorption
process. The strategic use of substrate and durable biomimicked wettability allowed to
comprehensive remediation of oil-spills—even under severe settings. In present, such
approach is further extended for developing chemically reactive slippery interfaces.
 W. Barthlott and C. Neinhuis, Planta, 1997, 202, 1.
 B. Su, Y. Tian and L. Jiang, J. Am. Chem. Soc., 2016, 138, 1727.
 A. M. Rather, N. Jana, S. Begum, H. K. Srivastava and U. Manna, Green Chem., 2017, 19, 4527.
 D. Parbat, S. Gaffar, A. M. Rather, A. Gupta and U. Manna, Chem. Sci., 2017, 8, 6542.
 K. Maji, U. Manna, J. Mater. Chem. A, 2018,6, 6642-6653.
 N. Jana, D. Parbat, U. Manna, Chem. Mater., 2019, 31, 1479-1484.