An Lab builds a multidisciplinary research program to establish the scientific base for advanced polymer composite materials with a deep understanding of the fundamental synthesis-morphology-property relationship. Our team bridges the gap in developing tailorable- and predictable-design for advanced polymer composite materials at the nano/micro-scale. We forge a vigorous multidisciplinary program integrating three-dimensional (3D) electron tomography and chemical analysis of composite materials, machine-learning based data-mining, and theoretical modeling to define new opportunities on impactful applications in energy, sensor, and sustainability.
I. 3D Nanoscale Analysis for Soft Materials
"Seeing in not 2D but 3D is believing."
Nat. Commun., Accepted.
Nat. Commun., 13 (1), 2738 (2022). [Link]
Sci. Adv., 8(8), eabk1888 (2022). [Link]
Nat. Commun., 11 (1), 1 (2020). [Link]
Mol. Syst. Des. Eng., 5 (1), 102 (2020). [Link]
ACS Appl. Nano Mater., 3 (2), 937 (2019). [Link]
ACS Appl. Mater. Interfaces, 11 (8), 8517 (2019). [Link]
II. Polymer-Inorganic Hybrids
II. Polymer-Inorganic Hybrids
"Mother Nature's secret"
Mother Nature has demonstrated amazing hybrid materials, which are strong, light-weight, and multifunctional, constructed from the intimate integration of organic and inorganic components. For example, organic-inorganic hybrid materials such as nacre and bone are well known for their hardness, strength, and resilience. These natural materials consist of brittle minerals connected by small amounts of biopolymer and have highly complex hierarchical structures whose properties far exceed what is obtained from simply mixing these two components together. I have aimed to unravel Mother Nature’s secrets in order to design and tailor-make multifunctional organic-inorganic hybrids. The areas of interest include flexible/structural batteries, surface-agnostic conductive coatings, and sensors.
(1) Energy Storage Materials
Flexible batteries are essential for wearable devices and flexible electronics to become more widely available but, most currently available batteries are bulky and rigid and their components are often brittle. We solved that problem by hybridizing vanadium pentoxide (V2O5) with a conductive block copolymer, poly(3-hexylthiophene)-block-poly(ethylene oxide) (P3HT-b-PEO), in order to fabricate a highly flexible battery cathode. The V2O5 layers were arranged in parallel and held together by the block copolymer binder in a brick-and mortar-like fashion resulting in an organic-inorganic hybrid that mimics materials found in nature. This unique structure significantly enhances mechanical flexibility and toughness without sacrificing battery capacity.
Nat. Mater., Accepted.
Polymers, 11 (4), 589 (2019). [Link]
ACS Appl. Polym. Mater., 1 (5), 1155 (2019). [Link]
ACS Appl. Energy Mater., 1 (11), 5919 (2018). [Link]
Langmuir, 33 (24), 5975 (2017). [Link]
ACS Energy Lett., 2 (8), 1919 (2017). [Link]
ACS Appl. Mater. Interfaces, 8 (42), 28585 (2016). [Link]
Sci. Rep., 5, 14166 (2015). [Link] Highlighted in C&EN News.
(2) Functional Conformal Coatings:
MXenes are a new and exciting class of materials that show great promise for use in the fields of conductive coatings, however, they are lacking in mechanical performance. Using nature as inspiration, I replicated the brick-and-mortar structure of tough and resilient nacre shells using layer-by-layer assembly. This hybridization combined high conductivity, mechanical robustness, and mechanical flexibility. This addresses one of the main obstacles in functional MXene materials and composites: failure and loss of functionality at low strains (4% strain). Furthermore, these MXene multilayer coatings can be deposited on to nearly any surface, regardless of chemistry, topography, or softness. This opens up a range of applications such as human motion sensing, topographic sensors, humidity sensors, and human health monitoring devices.