A5102897855- Infection Control and Ventilation
- Nanoporous metals and alloys
- Electrocatalysts for Energy Conversion
- Advanced Materials Characterization Techniques
- Inhalation and Respiratory Drug Delivery
- Noise Effects and Management
- COVID-19 and healthcare impacts
- ZnO doping and properties
- Electrodeposition and Electroless Coatings
- Molecular Junctions and Nanostructures
- Gas Sensing Nanomaterials and Sensors
- Electrochemical Analysis and Applications
- Copper-based nanomaterials and applications
- Radiation Dose and Imaging
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- nanoparticles nucleation surface interactions
- Healthcare and Environmental Waste Management
- Aerodynamics and Acoustics in Jet Flows
- Catalytic Processes in Materials Science
- Magnetic properties of thin films
- Climate Change and Health Impacts
- Semiconductor Quantum Structures and Devices
- GaN-based semiconductor devices and materials
- Chalcogenide Semiconductor Thin Films
University of Bristol
2019-2023
Polish Academy of Sciences
2012
Institute of Physics
2007-2008
The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic has brought renewed attention to aerosol and droplet generation. While many studies have robustly quantified (<10 µm diameter) number mass exhalation rates, fewer explored larger This study quantifies droplets (>20 generated by a cohort of 76 adults children using water-sensitive paper deposition approach. Unvoiced voiced activities spanning different levels loudness, lengths sustained phonation, specific manner...
We present transmission electron microscopy (TEM) and x-ray quantitative studies of the indium distribution in InxGa1−xN/GaN multiple quantum wells (MQWs) with x = 0.1 0.18. The were grown by low-pressure metalorganic chemical vapour deposition (LP-MOCVD) on a bulk, dislocation-free, mono-crystalline GaN substrate. By using TEM methodology absolute concentration was determined from 0002 lattice fringe images strain measurement coupled finite element (FE) simulations surface relaxation...
Aims Orthopaedic surgery uses many varied instruments with high-speed, high-impact, thermal energy and sometimes heavy instruments, all of which potentially result in aerosolization contaminated blood, tissue, bone, raising concerns for clinicians’ health. This study quantifies the aerosol exposure by measuring number size distribution particles reaching lead surgeon during key orthopaedic operations. Methods The yield from 17 open surgeries (on knee, hip, shoulder) was recorded at position...
AbstractTransmission of an airborne disease can occur when individual exhales respiratory particles that contain infectious pathogens. Surgical face masks are often used to reduce the amount aerosol emitted into environment by while also lowering concentration inhales. Respiratory generation is activity-dependent with high person-to-person variability. Moreover, mask fit differs among people. Here, we measure efficacy surgical (EN14683 Type IIR) in reducing both (0.3 – 20 μm diameter) and...
Electrodeposition of Pb on Au has been interest for the variety surface phenomena such as UnderPotential Deposition (UPD) and alloying. Here, we examined interface between electrodeposited film Au, using sensitive techniques X-ray Photoelectron Spectroscopy (XPS), Ultraviolet (UPS), Energy-Filtered Photoemission Electron Microscopy (EF-PEEM) Work Function (WF) mapping. The initially overlayer (~4 ML equivalent thickness) was transferred from electrochemical cell to UHV system. deposited...
Abstract New p‐type semiconducting ZnIrSiO thin films were fabricated using reactive magnetron RF sputtering from ZnIrSi target. Their transport properties were: resistivity ρ=0.6 Ωcm, hole concentration p=5x10 18 cm ‐3 and mobility μ=2 2 /Vs. Optical transmission in the visible wavelength region is 70% band gap width E g =3.17 eV. Films are XRD amorphous. HRTEM analysis revealed that composed of 1‐3 nm diameter nanograins Ir 3 Si ZnIr O 4 embedded an amorphous SiO matrix. (© 2012 WILEY‐VCH...
Due to its unique physicochemical, mechanical, and optical properties, Nanoporous gold (NPG) is of interest for various applications.[1-3] Its monolithic structure with the nanoscale size ligaments rich surface electrochemistry make NPG materials use in electrocatalysts, energy storage, sensors plasmonics. The length scale porosity (ligaments & open pores) effect on properties essential such a broad range applications. can be controlled by parent alloy composition, dealloying (chemical,...
The surface alloying during Pb underpotential deposition (UPD) on Au(111) films was studied using electrochemical techniques. This UPD system has been known for its unusual stress behavior associated with epitaxial monolayer (ML) formation. characteristic cyclic voltammetry of exhibits an anodic peak at the most positive potentials that does not have a symmetric cathodic counterpart. can be structural changes due to dealloying from top substrate layer. Two approaches were used study...
In many systems with a large lattice mismatch, the formation of surface alloys during deposition has been reported and theoretically predicted. 1 Pb monolayer on Au is one such system that studied extensively in past UHV electrochemical environment as underpotential deposition. 2-4 UPD Au(111) perchlorate solution model by techniques. 2-6 particular, in-situ stress STM studies 5,6 have demonstrated changes associated alloying at partial coverage. Our recent study showed effect extended...
<h2>SUMMARY</h2><h3>INTRODUCTION</h3> Phonation and speech are known sources of respirable aerosol in humans. Voice assessment treatment manipulate all the subsystems voice production, previous work (Saccente-Kennedy et al., 2022) has demonstrated such activities can generate >10 times more than conversational 30 breathing. Aspects therapy may therefore be considered generating procedures pose a greater risk potential airborne pathogen (eg, SARS-CoV-2) transmission typical speech. Effective...
Nanoporous gold (NPG) is a metamaterial with unique physicochemical, mechanical, and plasmonic properties of interest for various applications in catalysis electrocatalysis, energy conversion storage, (bio)sensing, actuation, surface-enhanced Raman scattering. 1-3 A monolithic structure the nanoscales size ligaments rich surface electrochemistry 3 make NPG materials promising many such highly active electrocatalysts conversion, three-dimensional substrates storage supercapacitors lithium ion...
Surface-alloys can form spontaneously during the deposition of one metal onto another, especially in systems with a large lattice mismatch that do not have bulk counterparts (so-called immiscible systems). The spontaneous surface alloying has been widely studied Ultra High Vacuum (UHV) [1], but these materials exploited much practical applications. Surface-alloying an electrochemical environment is ideal route to design new functional materials. Electrochemically controlled surface-alloying...
&lt;p&gt;The importance of bio-aerosols across the earth system has been known for some time. With unfortunate situation arising from COVID19 pandemic, attention turned to appropriate detection technologies that could be used better understand contribution aerosols generated lung in various settings. In this project, wideband Integrated Bioaerosol Sensor (WIBS-NEO) was deployed a zero-background clinical environment which permitted measured directly ascribed specific vocalisations...
The spontaneous surface alloying during deposition is an unexplored route for developing new materials with a great potential applications in catalysis, electronics, sensing and photonics. Although the surface-stress driven has been theoretically predicted explored on fundamental level Ultra High Vacuum (UHV) 1 , very little of that knowledge employed practice. electrochemically controlled surface-alloying not understood well, although it was reported many systems. formation UPD monolayer...