Eirini Goudeli

Modular Assembly of Host–Guest Metal–Phenolic Networks Using Macrocyclic Building Blocks

Publisher: Wiley

Date: 13-11-2020

DOI: 10.1002/ANIE.201912296

Abstract: The manipulation of interfacial properties has broad implications for the development of high-performance coatings. Metal-phenolic networks (MPNs) are an emerging class of responsive, adherent materials. Herein, host-guest chemistry is integrated with MPNs to modulate their surface chemistry and interfacial properties. Macrocyclic cyclodextrins (host) are conjugated to catechol or galloyl groups and subsequently used as components for the assembly of functional MPNs. The assembled cyclodextrin-based MPNs are highly permeable (even to high molecular weight polymers: 250-500 kDa), yet they specifically and noncovalently interact with various functional guests (including small molecules, polymers, and carbon nanomaterials), allowing for modular and reversible control over interfacial properties. Specifically, by using either hydrophobic or hydrophilic guest molecules, the wettability of the MPNs can be readily tuned between superrepellency (>150°) and superwetting (ca. 0°).

Gas sorption and diffusion in perfluoro(butenyl vinyl ether) based perfluoropolymeric membranes

Publisher: Elsevier BV

Date: 02-2022

DOI: 10.1016/J.MEMSCI.2021.120095

Interfacial piezoelectric polarization locking in printable Ti3C2Tx MXene-fluoropolymer composites

Publisher: Springer Science and Business Media LLC

Date: 26-05-2021

DOI: 10.1038/S41467-021-23341-3

Abstract: Piezoelectric fluoropolymers convert mechanical energy to electricity and are ideal for sustainably providing power to electronic devices. To convert mechanical energy, a net polarization must be induced in the fluoropolymer, which is currently achieved via an energy-intensive electrical poling process. Eliminating this process will enable the low-energy production of efficient energy harvesters. Here, by combining molecular dynamics simulations, piezoresponse force microscopy, and electrodynamic measurements, we reveal a hitherto unseen polarization locking phenomena of poly(vinylidene fluoride– co –trifluoroethylene) (PVDF-TrFE) perpendicular to the basal plane of two-dimensional (2D) Ti 3 C 2 T x MXene nanosheets. This polarization locking, driven by strong electrostatic interactions enabled exceptional energy harvesting performance, with a measured piezoelectric charge coefficient, d 33 , of −52.0 picocoulombs per newton, significantly higher than electrically poled PVDF-TrFE (approximately −38 picocoulombs per newton). This study provides a new fundamental and low-energy input mechanism of poling fluoropolymers, which enables new levels of performance in electromechanical technologies.

Printed recyclable and self-poled polymer piezoelectric generators through single-walled carbon nanotube templating

Publisher: Royal Society of Chemistry (RSC)

Date: 2020

DOI: 10.1039/C9EE03059J

Abstract: High-performance, unpoled and recyclable piezoelectric generators are produced by combining dipole templating via single-walled carbon nanotubes with shear-induced polarisation via 3D printing of fluoropolymers.

Exploiting Supramolecular Dynamics in Metal–Phenolic Networks to Generate Metal–Oxide and Metal–Carbon Networks

Publisher: Wiley

Date: 17-05-2021

DOI: 10.1002/ANGE.202103044

Abstract: Supramolecular complexation is a powerful strategy for engineering materials in bulk and at interfaces. Metal–phenolic networks (MPNs), which are assembled through supramolecular complexes, have emerged as suitable candidates for surface and particle engineering owing to their erse properties. Herein, we examine the supramolecular dynamics of MPNs during thermal transformation processes. Changes in the local supramolecular network including enlarged pores, ordered aromatic packing, and metal relocation arise from thermal treatment in air or an inert atmosphere, enabling the engineering of metal–oxide networks (MONs) and metal–carbon networks, respectively. Furthermore, by integrating photo‐responsive motifs (i.e., TiO 2 ) and silanization, the MONs are endowed with reversible superhydrophobic ( °) and superhydrophilic (≈0°) properties. By highlighting the thermodynamics of MPNs and their transformation into erse materials, this work offers a versatile pathway for advanced materials engineering.

Exploiting Supramolecular Dynamics in Metal–Phenolic Networks to Generate Metal–Oxide and Metal–Carbon Networks

Publisher: Wiley

Date: 17-05-2021

DOI: 10.1002/ANIE.202103044

Abstract: Supramolecular complexation is a powerful strategy for engineering materials in bulk and at interfaces. Metal–phenolic networks (MPNs), which are assembled through supramolecular complexes, have emerged as suitable candidates for surface and particle engineering owing to their erse properties. Herein, we examine the supramolecular dynamics of MPNs during thermal transformation processes. Changes in the local supramolecular network including enlarged pores, ordered aromatic packing, and metal relocation arise from thermal treatment in air or an inert atmosphere, enabling the engineering of metal–oxide networks (MONs) and metal–carbon networks, respectively. Furthermore, by integrating photo‐responsive motifs (i.e., TiO 2 ) and silanization, the MONs are endowed with reversible superhydrophobic ( °) and superhydrophilic (≈0°) properties. By highlighting the thermodynamics of MPNs and their transformation into erse materials, this work offers a versatile pathway for advanced materials engineering.

Engineering Programmable DNA Particles and Capsules Using Catechol-Functionalized DNA Block Copolymers

Publisher: American Chemical Society (ACS)

Date: 03-08-2022

DOI: 10.1021/ACS.CHEMMATER.2C01586

Discovery Projects - Grant ID: DP220103715

Start Date: 06-2022

End Date: 05-2025

Amount: $381,000.00

Funder: Australian Research Council

ARC Centres Of Excellence - Grant ID: CE200100009

Start Date: 07-2020

End Date: 07-2027

Amount: $35,000,000.00

Funder: Australian Research Council