Armaghan Fakhfouri

Leibniz Institute for Solid State and Materials Research

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Andreas Winkler

Leibniz Institute for Solid State and Materials Research

Adrian Neild

Monash University

Citsabehsan Devendran

Monash University

Víctor Rico

Universidad de Sevilla

Melanie Colditz

Leibniz Institute for Solid State and Materials Research

Agustín R. González‐Elipe

Instituto de Ciencia de Materiales de Sevilla

Kateryna Ivanova

Leibniz Institute for Solid State and Materials Research

Carmen López‐Santos

Instituto de Ciencia de Materiales de Sevilla

Laura Montes

Instituto de Ciencia de Materiales de Sevilla

Adam S. Best

Commonwealth Scientific and Industrial Research Organisation

Cooperative Institutions

Monash University

Clayton Foundation

Australian Regenerative Medicine Institute

Leibniz Institute for Solid State and Materials Research

Instituto de Ciencia de Materiales de Sevilla

Universidad de Sevilla

Commonwealth Scientific and Industrial Research Organisation

TU Dresden

Consejo Superior de Investigaciones Científicas

CSIRO Manufacturing

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A Holistic Solution to Icing by Acoustic Waves: De‐Icing, Active Anti‐Icing, Sensing with Piezoelectric Crystals, and Synergy with Thin Film Passive Anti‐Icing Solutions

Advanced Functional Materials (2023)

Jaime del Moral Laura Montes Víctor Rico Carmen López‐Santos Stefan Jacob

Abstract Icing has become a hot topic both in academia and in the industry given its implications in transport, wind turbines, photovoltaics, and telecommunications. Recently proposed de‐icing solutions involving the propagation of acoustic waves (AWs) at suitable substrates may open the path for a sustainable alternative to standard de‐icing or anti‐icing procedures. Herein, the fundamental interactions are unraveled that contribute to the de‐icing and/or hinder the icing on AW‐activated substrates. The response toward icing of a reliable model system consisting of a piezoelectric plate activated by extended electrodes is characterized at a laboratory scale and in an icing wind tunnel under realistic conditions. Experiments show that surface modification with anti‐icing functionalities provides a synergistic response when activated with AWs. A thoughtful analysis of the resonance frequency dependence on experimental variables such as temperature, ice formation, or wind velocity demonstrates the application of AW devices for real‐time monitoring of icing processes.

10.1002/adfm.202209421

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Suppressed Polysulfide Crossover in Li–S Batteries through a High-Flux Graphene Oxide Membrane Supported on a Sulfur Cathode

ACS Nano (2016)

Mahdokht Shaibani Abozar Akbari Phillip Sheath Christopher D. Easton Parama Chakraborty Banerjee

Utilization of permselective membranes holds tremendous promise for retention of the electrode-active material in electrochemical devices that suffer from electrode instability issues. In a rechargeable Li–S battery—a strong contender to outperform the Li-ion technology—migration of lithium polysulfides from the sulfur cathode has been linked to rapid capacity fading and lower Coulombic efficiency. However, the current approaches for configuring Li–S cells with permselective membranes suffer from large ohmic polarization, resulting in low capacity and poor rate capability. To overcome these issues, we report the facile fabrication of a high-flux graphene oxide membrane directly onto the sulfur cathode by shear alignment of discotic nematic liquid crystals of graphene oxide (GO). In conjunction with a carbon-coated separator, the highly ordered structure of the thin (∼0.75 μm) membrane and its inherent surface charge retain a majority of the polysulfides, enabling the cells to deliver very high initial discharge capacities of 1063 and 1182 mAh gelectrode–1 for electrodes with 70 and 80% sulfur content, respectively, at the practical 0.5 C rate. The very high sulfur utilization and impressive capacity retentions of the high sulfur content electrodes result in some of the highest performance metrics in the literature of Li–S (e.g., electrode capacity of 835 mAh gelectrode–1 after 100 cycles at 0.5 C with a sulfur content of 80%). We show that the structural order of the shear-aligned GO membrane is key in maintaining good kinetics of the charge transfer processes in Li–S batteries.

Polysulfide

Lithium–sulfur battery

Separator (oil production)

10.1021/acsnano.6b03285

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Citations (151)

Surface acoustic wave diffraction driven mechanisms in microfluidic systems

Lab on a Chip (2018)

Armaghan Fakhfouri Citsabehsan Devendran T. Albrecht David J. Collins Andreas Winkler

We present five distinct mechanisms arising from the incidence of a finite-width surface acoustic waves (SAW) beam propagating into a quiescent fluid.

10.1039/c8lc00243f

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Citations (53)

Virtual membrane for filtration of particles using surface acoustic waves (SAW)

Lab on a Chip (2016)

Armaghan Fakhfouri Citsabehsan Devendran David J. Collins Ye Ai Adrian Neild

Surface acoustic wave (SAW) based particle manipulation is contactless, versatile, non-invasive and biocompatible making it useful for biological studies and diagnostic technologies.

Biocompatible material

Filtration (mathematics)

Particle (ecology)

10.1039/c6lc00590j

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Citations (43)

Blood platelet enrichment in mass-producible surface acoustic wave (SAW) driven microfluidic chips

Lab on a Chip (2019)

Cynthia Richard Armaghan Fakhfouri Melanie Colditz Friedrich Striggow Romy Kronstein‐Wiedemann

SAW-based acoustofluidic blood platelet separation at 2.7 × 10⁴ cells per s throughput in a comprehensively analysed and numerical simulated, wafer-scale manufactured device.

10.1039/c9lc00804g

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Citations (48)

Surface acoustic wave nebulization improves compound selectivity of low-temperature plasma ionization for mass spectrometry

Scientific Reports (2021)

Andreas Kiontke Mehrzad Roudini Susan Billig Armaghan Fakhfouri Andreas Winkler

Mass spectrometry coupled to low-temperature plasma ionization (LTPI) allows for immediate and easy analysis of compounds from the surface of a sample at ambient conditions. The efficiency of this process, however, strongly depends on the successful desorption of the analyte from the surface to the gas phase. Whilst conventional sample heating can improve analyte desorption, heating is not desirable with respect to the stability of thermally labile analytes. In this study using aromatic amines as model compounds, we demonstrate that (1) surface acoustic wave nebulization (SAWN) can significantly improve compound desorption for LTPI without heating the sample. Furthermore, (2) SAWN-assisted LTPI shows a response enhancement up to a factor of 8 for polar compounds such as aminophenols and phenylenediamines suggesting a paradigm shift in the ionization mechanism. Additional assets of the new technique demonstrated here are (3) a reduced analyte selectivity (the interquartile range of the response decreased by a factor of 7)-a significant benefit in non-targeted analysis of complex samples-and (4) the possibility for automated online monitoring using an autosampler. Finally, (5) the small size of the microfluidic SAWN-chip enables the implementation of the method into miniaturized, mobile LTPI probes.

Sample Preparation

10.1038/s41598-021-82423-w

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Citations (11)

Patterning and control of the nanostructure in plasma thin films with acoustic waves: mechanicalvs.electrical polarization effects

Materials Horizons (2020)

Aurelio García‐Valenzuela Armaghan Fakhfouri Manuel Oliva‐Ramírez Víctor Rico T.C. Rojas

Plasma thin film deposition assisted with acoustic waves renders a patterned structure due to sheath ions local bombardment effects.

10.1039/d0mh01540g

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Citations (11)

表面音響波(SAW)を用いた粒子濾過用の仮想膜

Lab on a Chip (2016)

Armaghan Fakhfouri Citsabehsan Devendran J Collins David Ai Ye Neild Adrian

Source

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Citations (1)

The design of surface acoustic waves field for manipulation of particles in microfluidics

Armaghan Fakhfouri

Manipulation of particles and cells is fundamental to numerous biological, chemical and industrial processes. Surface acoustic waves (SAW) provide a promising tool for a powerful, yet gentle manipulation. The newness of this technology, however, means that many advantages, made feasible by SAW, are still waiting for full realisation. The scope of this thesis has been to explore the physical principles that underline SAW-driven systems with a focus on particle manipulation.

Scope (computer science)

Realisation

10.26180/5c94391c73363

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Citations (1)

A High-Flux Polysulfide Blocking Membrane Fabricated By Shear Alignment of Discotic Nematic Liquid Crystals of Graphene Oxide on Sulfur Cathode

Meeting abstracts/Meeting abstracts (Electrochemical Society. CD-ROM) (2016)

Mahdokht Shaibani Abozar Akbari Phillip Sheath Christopher D. Easton Kristina Konstas

With consistent technological advances, demands for batteries with considerably higher specific energy than current Lithium ion devices are apparent. As an extremely promising alternative to Li-ion, the electrochemistry of Lithium-Sulfur (Li-S) has received strong attention due to its theoretical specific capacity of 1675 mAh g -1 and theoretical specific energy of 2500 Wh kg -1 . Turning the principle of the Li-S concept into practice though faces a number of key challenges. Among these challenges, the continuous crossover of highly soluble polysulfides – the electrode active material from the cathode through the separator to the lithium anode and vice versa - is primarily responsible for rapid capacity fading of Li-S cells. [ 1 ] Accordingly, the focus of the research effort in this area has been devoted to the retention of sulfur and its reduction products on the cathode side of the battery. These studies have produced some striking improvements in both the sulfur cathode durability and the role that the separator plays in a Li-S battery. [ 2 , 3 ] The separator is a critical component in liquid electrolyte energy storage devices. Sitting between the positive and negative electrode to prevent physical contact between them, the membrane should show sufficient wettability, porosity, chemical, mechanical, thermal and dimensional stability while demonstrating high permeability and high flux. However, for electrochemical systems where redox-active species are dissolved or dispersed in the electrolyte, such as redox flow batteries, fuel cells, and Li-S batteries, permselectivity is also a crucial property. Little attention has been paid to the usage of permselective membranes in the Li-S cells while tremendous efforts have been devoted to the structure and composition of the cathode. A few recent articles have explored the use of permselective membrane separator in mitigating the issue of migration of polysulfides. [ 3 , 4 ] Despite partial success with retention of polysulfides, the presence of such permselective membranes results in a natural decrease in the ion flux across the membrane. This may potentially hinder the industrial use of permselective membranes in Li-S battery where the rate capability is already an issue due to the slow kinetics of the reactions. Accordingly it is highly desirable to achieve an ion-selective transport and mitigate the consequences of polysulfides whilst enabling unimpeded transport of ions. In here we report, for the first time, the integration of a high-selectivity, high-flux GO membrane directly supported onto the sulfur electrode in a Li-S battery. This simple approach dramatically resolves the issue of dissolution of electrode material in battery electrolyte and delivers properties close to those required for a practical rechargeable battery. Our shear-aligned GO membrane which is directly coated onto the electrode, is uniquely composed of well-ordered stacks of the graphene sheets in the membrane plane and we unambiguously demonstrate that its integration in the Li-S battery hardly interferes with free ionic flow in the device. For example, alongside with excellent capacity retention arising from the inherent surface charge of the GO, the highly ordered structure of the thin (~ 0.75 µm) membrane enables the cells to deliver unprecedented high initial discharge capacities of 1616, 1400 and 1170 mAh g-1 at 0.2 C, 0.5 C and 1 C rates, respectively. The remarkable rate capability results reported in this work provides a reliable foundation to challenge the long-held belief that integrating permselective membranes in electrochemical energy storage devises suffering from electrode instability issues, although critical for capacity retention are not suitable for power characteristics. [1] M. Barghamadi, A. S. Best, A. I. Bhatt, A. F. Hollenkamp, M. Musameh, R. J. Rees, T. Rüther, Energy & Environmental Science 2014. [2] J. Song, M. L. Gordin, T. Xu, S. Chen, Z. Yu, H. Sohn, J. Lu, Y. Ren, Y. Duan, D. Wang, Angewandte Chemie 2015. [3] J.-Q. Huang, T.-Z. Zhuang, Q. Zhang, H.-J. Peng, C.-M. Chen, F. Wei, ACS nano 2015, 9, 3002. [4] C. Li, A. L. Ward, S. E. Doris, T. A. Pascal, D. Prendergast, B. A. Helms, Nano letters 2015, 15, 5724.

Separator (oil production)

Polysulfide

10.1149/ma2016-03/2/1187

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