A5020730700- Carbon Nanotubes in Composites
- Advanced Sensor and Energy Harvesting Materials
- Electrospun Nanofibers in Biomedical Applications
- Fiber-reinforced polymer composites
- Conducting polymers and applications
- Supercapacitor Materials and Fabrication
- Graphene research and applications
- Modular Robots and Swarm Intelligence
- Advanced Thermoelectric Materials and Devices
- Energy Harvesting in Wireless Networks
- Acoustic Wave Phenomena Research
- Dielectric materials and actuators
- Advanced Fiber Optic Sensors
- Advanced Wireless Communication Technologies
- Photonic Crystal and Fiber Optics
- Nanowire Synthesis and Applications
- Microfluidic and Bio-sensing Technologies
- Thermal Radiation and Cooling Technologies
- Structural Analysis and Optimization
- Advanced Antenna and Metasurface Technologies
- Nanomaterials and Printing Technologies
- Thermal properties of materials
- Mechanical Behavior of Composites
- Diamond and Carbon-based Materials Research
- Semiconductor Quantum Structures and Devices
University of Surrey
2014-2022
Thomas Swan (United Kingdom)
2018
One of the major problems limiting applications electric double‐layer (EDLC) supercapacitor devices is their inability to maintain cell voltage over a significant period. Self‐discharge spontaneous decay in charged energy, often resulting fully depleted matter hours. Here, new method for suppressing this self‐discharge phenomenon proposed by using directionally polarized piezoelectric electrospun nanofiber films as separator materials. Tailored engineering polyvinylidene fluoride (PVDF)...
A simple, low-cost, linearly polarized reconfigurable reflectarray surface (RAS) is presented that can provide beam steering over a wide range of angles in one plane. The results for prototype design demonstrated from 35° to 60° at 5.5 GHz. Simple equations describing the angle and overall size minimum radar cross-sectional area (RCS) are aid system designer. concertina RAS be manufactured using screen-printing techniques making this potentially low-cost product meet needs widespread...
The need for the fabrication of a new generation devices has developed with next ‘home’ engineers, which is resulting in an ever-increasing population interested “do-it-yourself” electronics and Internet Things. However, this trend should not be done at expense environment. Almost all previous studies, related to low-temperature processing devices, fail highlight extent impact that synthesis these technologies have on both environment human health. In addition, substrates typically used, are...
Thermoelectrics are a promising solution to the recovery of some 60% worldwide energy wasted as heat. However, their conversion efficiency is low and best performing materials brittle, toxic, made expensive ceramics. The challenge in developing better disrupting electrical vs thermal conductivity correlation, achieve simultaneously with high conductivity. Carbon nanotubes allow for decoupling electronic density states from phonon this paper shows that flexible, thin films double‐walled...
There is a general lack of publications on the acoustical and related non-acoustical properties nanofibrous media. This work attempts to contribute this gap highlight problems associated with acoustic non-acoustic characterisation these materials. The work, presumably for first time, applies Biot- Darcy-type mathematical models explain observed behaviours nanofibres. It identifies theoretical gaps physical phenomena which can be responsible membranes it presents recommendations fill gaps....
Abstract Polymer piezoelectric nanogenerators have attracted attention for mechanical energy harvesting, powering wearable electronics and movement sensing applications. Polyvinylidene fluoride (PVDF) is a flexible efficient electroactive polymer, however, it polymorph which only two phases (of five) are piezoelectric. Herein produced breathable textile‐compatible mats via electrospinning, the polymorphism of PVDF nanofibers during deposition controlled, rather than post‐fabrication, meaning...
As a technique, electrospinning has been increasingly utilised for polymer nanofibre production, which growing list of advanced applications to they are being applied. However, commercially scaling the process is challenging, especially when uniformity nanofibres across bulk material important required application. At present, most commercially-scalable systems tend rely on drum or cylindrical-style electrode, where multitude jets formed with no specific controlled distribution over its...
Large-scale incorporation of nanomaterials into manufactured materials can only take place if they are suitably dispersed and mobile within the constituent components, typically a solution/ink formulation so that additive process commence. Natural hydrophobicity many must be overcome for their successful any solution-based manufacturing process. To date, this has been achieved using polymers or surfactants, rather than chemical functionalization, to preserve remarkable properties...
In order to increase the material throughput of aligned discontinuous fibre composites using technologies such as HiPerDiF, stability carbon fibres in an aqueous solution needs be achieved. Subsequently, a range surfactants, typically employed disperse carbon-based materials, have been assessed determine most appropriate for use this regard. The optimum was observed when anionic surfactant, sodium dodecylbenzene sulphonate, which superior other non-ionic and single-fibre fragmentation...
Electrospun nonwoven veils comprising thermoplastic fibres (average diameter 400–600 nm) based on polysulfone (PSU), polyamide (PA-6,6), and polyetherimide (PEI) have been fabricated used as interlaminar reinforcements in carbon fibre composites containing a commercial epoxy resin (8552/IM7). Samples were tested for their properties improvements observed the initial mode I toughness of 30% 36% (PEI), 44% while 7% (PSU) 8% propagation toughness. A reduction 11% was PA-6,6. Post-testing...
Carbon nanotubes (CNTs) have unique properties with promise to outperform the electrical characteristics of bulk copper, giving rise its primary driver for use in electronic devices. The challenge still hindering their full exploitation stems from an inability manufacture them long lengths, resulting a requirement align and entwine into yarn or wire. There been several methods presented achieving this, however, common disadvantage has that they are only applicable specific types morphologies...
Abstract The feasibility of using self‐assembled InAs nanowire bottom‐gated field‐effect transistors as radio‐frequency and microwave switches by direct integration into a transmission line is demonstrated. This proof concept demonstrated coplanar waveguide (CPW) line, where the nanowires function tunable impedance in CPW through gate biasing. key to this switching capability high‐performance, low transistor behavior with mobility ≈300 cm 2 V −1 s , on/off ratio 10 3 resistance modulation...
Research into carbon nanotubes (CNTs) has been a hot topic for almost 3 decades, and it is now that we are beginning to observe the impact of advanced applictions this nanomaterial in areas such as electronics. Currently, order mass produce CNT devices, either large-scale synthesis, followed by numerous energy-intensive processing steps or photolithography processes, including several sputter-deposition steps, required pattern material fabricate functional devices. In work reported here,...
Carbon nanotubes (CNTs) have unique properties with promise to outperform the electrical characteristics of bulk copper, giving rise its primary driver for use in electronic devices. The challenge still hindering their full exploitation stems from an inability manufacture them long lengths, resulting a requirement align and entwine into yarn or wire. There been several methods presented achieving this, however, common disadvantage has that they are only applicable specific types morphologies...
Energy harvesting devices such as solar panels and wind generators collect energy sources convert them to generate power. Such are economical efficient also allow be generated applications powered in places without conventional power sources, underwater. has the potential used satisfy need for autonomy that autonomous electronics, Internet of Things (IoT) wearable demand. At University Surrey, UK, Dr Simon King is collaborating with Bilal Malik, Maxim Shkunov Pavlos Giannakou on a project...