4.6 Article

Time-dependent electrical double layer with blocking electrode

Journal

APPLIED PHYSICS LETTERS
Volume 94, Issue 4, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.3077605

Keywords

biochemistry; electrochemical electrodes; electrochemistry; electrolytes; molecular biophysics

Funding

  1. MOE
  2. A* STAR, Singapore [0421010080]

Ask authors/readers for more resources

This paper deals with the experimental observation of time-dependent electrical double layer (EDL) in electrolyte. A potential-distance diagram is used to fully understand different stages in the formation of EDL. The influence of the thickness of the blocking layer and the ionic strength to the formation of EDL is discussed based on the equivalent circuit. With this simple method, it is found that in addition to Debye screening length, the frequency has to be considered if an alternating electric field is used to control the movement of charged biomolecules inside EDL.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

Article Materials Science, Biomaterials

Current and future perspectives on biomaterials for segmental mandibular defect repair

D. S. Abdullah Al Maruf, Krishnan Parthasarathi, Kai Cheng, Payal Mukherjee, David R. McKenzie, Jeremy M. Crook, Gordon G. Wallace, Jonathan R. Clark

Summary: This review focuses on the recent progresses in modulating the physiochemical properties and applications of biomaterials in bone tissue engineering (BTE) for mandibular segmental defect repair. BTE is an important strategy for reconstructing critical-sized bone defects and improving patients' quality of life.

INTERNATIONAL JOURNAL OF POLYMERIC MATERIALS AND POLYMERIC BIOMATERIALS (2023)

Article Chemistry, Analytical

Low-Power Magnetron Sputtering Deposition of Antimonene Nanofilms for Water Splitting Reaction

Xingli Wang, Junyu Ge, Nicole Ru-Xuan Ang, Kun Liang, Chong-Wei Tan, Hong Li, Beng Kang Tay

Summary: In this study, Sb nanofilms with lateral dimensions on the centimeter scale and controllable film thickness were successfully prepared using low-power magnetron sputtering deposition. The control of the deposition temperature was found to be important for the final crystalline structure of the nanofilms. Furthermore, the application of the nanofilms as a catalyst for water splitting was demonstrated.

MICROMACHINES (2022)

Article Nanoscience & Nanotechnology

Stabilizing the Unstable: Chromium Coating on NiMo Electrode for Enhanced Stability in Intermittent Water Electrolysis

Lingyi Peng, Jie Min, Avi Bendavid, Dewei Chu, Xunyu Lu, Rose Amal, Zhaojun Han

Summary: This study reveals that NiMo electrodes used in intermittent water electrolysis easily suffer from oxidation during power interruption, leading to the loss of active sites and conductivity. By understanding the degradation mechanism, a chromium (Cr) coating is successfully applied as a protective layer to inhibit oxygen reduction reaction (ORR) and significantly enhance the stability of NiMo electrodes in intermittent electrolysis. Experimental and Molecular Dynamics (MD) simulations show that the Cr coating acts as a physical barrier for preventing oxygen diffusion while allowing other species to pass through.

ACS APPLIED MATERIALS & INTERFACES (2022)

Article Materials Science, Multidisciplinary

High Areal Capacity and Long Cycle Life Flexible Mild Quasi-Solid-State Ag-Zn Battery with Dendrite-Free Anode

Yanzhe Zhu, Renbo Zhu, Fandi Chen, Shuo Zhang, Yu-Chieh Kuo, Peiyuan Guan, Mengyao Li, Yunjian Liu, Zhaojun Han, Tao Wan, Dawei Wang, Caiyun Wang, Dewei Chu

Summary: In this study, a flexible quasi-solid-state Ag-Zn battery system with superior performance was developed by using mild electrolyte and binder-free electrodes. The introduction of a copper foam current collector impedes the growth of Zn dendrite, and the structure of Ag cathode is engineered to improve the areal capacity. This battery demonstrates remarkable cycle retention and high energy density.

ENERGY & ENVIRONMENTAL MATERIALS (2023)

Article Materials Science, Multidisciplinary

Micro-CT Analysis of Implanted Poly-Ether-Ether-Ketone Scaffolds: Plasma Immersion Ion Implantation Increases Osteoconduction

Georgio Katsifis, Hedi Kruse, Will Lewin, Abdullah Al Maruf, Jonathan R. R. Clark, David R. McKenzie, Natalka Suchowerska

Summary: This study evaluates the osteoconduction of a 3D printed PEEK scaffold treated with plasma immersion ion implantation (PIII) compared to an untreated structure using micro-CT imaging. The treated PEEK scaffold contains denser and larger amounts of bone within the interior volume, while the untreated PEEK has more bone immediately outside the scaffold boundaries. This difference is attributed to the improved hydrophilicity and protein covalent binding provided by the PIII treatment.

ADVANCED ENGINEERING MATERIALS (2023)

Article Engineering, Manufacturing

Synergistically enhancing the electrical conductivity of carbon fibre reinforced polymers by vertical graphene and silver nanowires

Zhao Sha, Xinying Cheng, Mohammad S. Islam, Pichsinee Sangkarat, Wenkai Chang, Sonya A. Brown, Shuying Wu, Jin Zhang, Zhaojun Han, Shuhua Peng, Chun H. Wang

Summary: This study introduces a hybrid method to enhance the electrical conductivity of carbon fibre reinforced polymers (CFRPs) by functionalizing carbon fibres with vertical graphene (VG) and modifying the matrix with silver nanowires (AgNWs). The results showed a significant increase in through-thickness and in-plane electrical conductivities without affecting mechanical properties. Finite element modelling and computational modelling explained the synergy and demonstrated the reduction in joule heat density under lightning strike conditions.

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING (2023)

Review Chemistry, Multidisciplinary

Advances in high-voltage supercapacitors for energy storage systems: materials and electrolyte tailoring to implementation

Jae Muk Lim, Young Seok Jang, Hoai Van T. Nguyen, Jun Sub Kim, Yeoheung Yoon, Byung Jun Park, Dong Han Seo, Kyung-Koo Lee, Zhaojun Han, Kostya (Ken) Ostrikov, Seok Gwang Doo

Summary: To achieve a zero-carbon-emission society, increasing the use of clean and renewable energy is crucial. However, renewable energy resources have limitations in terms of geographical locations and limited time intervals for energy generation. Therefore, there is a rising demand for high-performance energy storage systems (ESSs) to effectively store and utilize energy during peak and off-peak periods. Supercapacitors, particularly electrical double layer capacitors (EDLCs), show promise as short-term ESSs due to their long cycle retention, high power densities, fast charge/discharge characteristics, and moderate operating voltage window. However, further research is needed to increase the operating voltage and energy densities of EDLCs while maintaining long-term cycle stability and power densities, which are crucial for ESS operation. This article examines advancements in EDLC research to achieve a high operating voltage window and high energy densities for next-generation supercapacitor-based ESSs.

NANOSCALE ADVANCES (2023)

Article Nanoscience & Nanotechnology

Enhancing the Electrochemical Properties of Nickel-Rich Cathode by Surface Coating with Defect-Rich Strontium Titanate

Peiyuan Guan, Jie Min, Fandi Chen, Shuo Zhang, Long Hu, Zhipeng Ma, Zhaojun Han, Lu Zhou, Haowei Jia, Yunjian Liu, Neeraj Sharma, Dawei Su, Judy N. Hart, Tao Wan, Dewei Chu

Summary: In this study, a defect-rich SrTiO3-x coating was applied on a Ni-rich layered cathode (LiNi0.8Co0.15Al0.05O2) to enhance its electrochemical performance. The optimized sample exhibited a high discharge capacity of around 170 mA h/g after 200 cycles at 1C rate, with a capacity retention of over 81.1%. Postmortem analysis revealed that the SrTiO3-x coating not only alleviated the growth of internal resistance due to uncontrollable cathode-electrolyte interface evolution but also served as a lithium diffusion channel during prolonged cycling. This work presents a feasible strategy for improving the electrochemical performance of high-nickel content layered cathodes for next-generation LIBs.

ACS APPLIED MATERIALS & INTERFACES (2023)

Article Chemistry, Analytical

Neuromorphic sensing of biomolecules covalently immobilised on polydimethyl glutarimide

Luke A. Sylvander, Phuong Y. Le, Hiep N. Tran, Billy J. Murdoch, Enyi Guo, David R. Mckenzie, Dougal G. Mcculloch, Jim G. Partridge

Summary: In this study, polydimethyl glutarimide (PMGI) layers were modified to introduce free radical covalent binding sites. Horseradish peroxidase (HRP) enzyme was successfully immobilized on the treated PMGI, and the treated PMGI was incorporated as a gate dielectric layer in a three-terminal electrolyte-gated device. The presence of HRP on the plasma-modified PMGI gate dielectric layer altered the device characteristics and allowed for readout detection.

ANALYTICA CHIMICA ACTA (2023)

Article Chemistry, Multidisciplinary

Extensively Microtwinned Diamond with Nanolaminates of Lonsdaleite Formed by Flash Laser Heating of Glassy Carbon

Brenton Cook, Philipp Reineck, Thomas Shiell, Jodie Bradby, Bryan D. Esser, Joanne Etheridge, Bianca Haberl, Reinhard Boehler, David R. Mckenzie, Dougal G. McCulloch

Summary: Diamond is a crucial material for biosensors, quantum computing, and space components due to its unique properties at the nanoscale. Researchers have successfully synthesized oriented, faceted diamond particles by flash laser heating of glassy carbon, and observed their microstructure and periodicity.

NANO LETTERS (2023)

Article Chemistry, Physical

Enhanced pH-Universal Hydrogen Evolution Reactions on the Ru/a-Ni-MoO3 Electrocatalysts

Lingyi Peng, Ding Zhang, Zhipeng Ma, Dewei Chu, Claudio Cazorla, Rose Amal, Zhaojun Han

Summary: This paper reports a pH-universal HER catalyst Ru/a-Ni-MoO3, which shows superior performance compared to the commercial Ru/C catalyst. The electron transfer from Ru to a-Ni-MoO3 is identified, leading to a modified electronic structure of the Ru active sites. Density functional theory calculations reveal that the modulated electronic structure facilitates the interactions between the Ru active sites and the reaction intermediates, promoting the HER reaction steps. The experimental and theoretical findings provide insights into enhancing pH-universal HER performance.

SMALL STRUCTURES (2023)

Article Engineering, Electrical & Electronic

E-Band Vertically Aligned Carbon Nanotubes-Based Air-Filled Waveguide

Joseph M. de Saxce, Chun Fei Siah, Tan Chong Wei, Damien Passerieux, Stephane Bila, Florence Podevin, Beng Kang Tay, Philippe Coquet, Dominique Baillargeat

Summary: This letter presents a novel E-band vertically aligned carbon nanotubes-based air-filled waveguide (AFWG). The waveguide is designed using a full-wave three-dimensional electromagnetic software and an equivalent VACNTs bulk model, and fabricated using a CMOS compatible CNTs transfer process and a dedicated assembly process. The concept of the CNTs-based AFWG is validated for the first time through measurements, with an experimental attenuation constant estimated at 0.5 dB/mm between 81 and 86 GHz.

IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS (2023)

Review Biophysics

An omics approach to delineating the molecular mechanisms that underlie the biological effects of physical plasma

Lou I. S. A. Gonzales, Jessica W. Qiao, Aston W. Buffier, Linda J. Rogers, Natalka Suchowerska, David R. Mckenzie, Ann H. Kwan

Summary: The use of physical plasma in cancer treatment is a growing field, and omics studies have provided insights into the molecular mechanisms behind its action. These studies have revealed how physical plasma preferentially affects critical cellular pathways in cancer cells, leading to cell death. The future outlook for omics lies in exploring its synergies and antagonisms with other cancer therapies and overcoming challenges in clinical translation.

BIOPHYSICS REVIEWS (2023)

Article Chemistry, Multidisciplinary

Bimetallic RuNi-decorated Mg-CUK-1 for oxygen-tolerant carbon dioxide capture and conversion to methane

Timothy Zurrer, Emma Lovell, Zhaojun Han, Kang Liang, Jason Scott, Rose Amal

Summary: This study developed a metal-organic framework (MOF) material loaded with Ru and Ni nanoparticles for the capture and conversion of CO2 to CH4. Low nanocatalyst loadings improved overall performance and facilitated complete CO2 release and conversion. Ru-loaded Mg-CUK-1 exhibited good oxygen tolerance, while Ni-loaded Mg-CUK-1 could not maintain initial catalytic performance. Ru aided the re-reduction of NiO to Ni, leading to enhanced overall performance of the hybrid material.

NANOSCALE (2022)

Article Materials Science, Multidisciplinary

Electrically tuneable terahertz metasurface enabled by a graphene/gold bilayer structure

Andrew D. Squires, Xiang Gao, Jia Du, Zhaojun Han, Dong Han Seo, James S. Cooper, Adrian T. Murdock, Simon K. H. Lam, Ting Zhang, Tim van der Laan

Summary: This research proposes a graphene/gold bilayer metasurface as a reconfigurable and tunable material for terahertz electronic devices. A frequency-selective absorber with electrical tuning in the 0.1-1 THz range is created using this material. This study is crucial for the development of high-speed wireless communication and sensing technologies.

COMMUNICATIONS MATERIALS (2022)

No Data Available