A5077502922- Semiconductor materials and devices
- Copper Interconnects and Reliability
- Metal and Thin Film Mechanics
- Fuel Cells and Related Materials
- Semiconductor materials and interfaces
- Integrated Circuits and Semiconductor Failure Analysis
- Membrane Separation Technologies
- Air Quality and Health Impacts
- Graphene research and applications
- MXene and MAX Phase Materials
- Membrane-based Ion Separation Techniques
- Electron and X-Ray Spectroscopy Techniques
- Nanopore and Nanochannel Transport Studies
- Iron-based superconductors research
- Electronic and Structural Properties of Oxides
- 2D Materials and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Rare-earth and actinide compounds
- Catalytic Processes in Materials Science
- Nanoparticle-Based Drug Delivery
- Magnetic and transport properties of perovskites and related materials
- Advanced Electron Microscopy Techniques and Applications
- Iron oxide chemistry and applications
- Electrostatics and Colloid Interactions
- Photosynthetic Processes and Mechanisms
Imperial College London
2010-2024
London Centre for Nanotechnology
2008-2020
Cornell University
2017
Johannes Gutenberg University Mainz
2017
Fraunhofer Institute for Applied Polymer Research
2017
Columbia University
2017
University of Massachusetts Amherst
2017
University of Glasgow
2007-2008
We report on the fabrication and characterization of a DNA nanopore detector with integrated tunneling electrodes. Functional devices were identified by spectroscopy in different solvents then used proof-of-principle experiments demonstrating, for first time, concurrent detection ionic current molecules platform. This is an important step toward ultrafast sequencing tunneling.
Cell-sized vesicles have tremendous potential both as miniaturised pL reaction vessels and in bottom-up synthetic biology chassis for artificial cells. In these areas the introduction of light-responsive modules affords increased functionality, example, to initiate enzymatic reactions vesicle interior with spatiotemporal control. Here we report a system composed nested where inner compartments act phototransducers, responding ultraviolet irradiation through diacetylene polymerisation-induced...
Production of biocompatible and stable porous materials, e.g., boron nitride, exhibiting tunable enhanced porosity is a prerequisite if they are to be employed address challenges such as drug delivery, molecular separations, or catalysis. However, there currently very limited understanding the formation mechanisms nitride parameters controlling its porosity, which ultimately prevents exploiting material's full potential. Herein, we produce with high surface area micro/mesoporosity via facile...
BackgroundDiesel exhaust particles (DEPs) are a major component of particulate matter in Europe's largest cities, and epidemiologic evidence links exposure with respiratory symptoms asthma exacerbations. Respiratory reflexes responsible for regulated by vagal afferent nerves, which innervate the airway. It is not known how DEP activates airway afferents to elicit symptoms, such as cough bronchospasm.ObjectiveWe sought identify mechanisms involved activation sensory DEPs.MethodsIn this study...
Osteopontin (OPN) is a non-collagenous protein involved in biomineralization of bone tissue. Beyond its role biomineralization, we show that osteopontin essential to the quality collagen fibrils bone. Transmission electron microscopy revealed that, Opn
Abstract Elemental phosphorus displays an impressive number of allotropes with highly diverse chemical and physical properties. White has now been filled into single‐wall carbon nanotubes (SWCNTs) from the liquid thereby stabilized against exothermic reaction atmospheric oxygen. The encapsulated tetraphosphorus molecules were visualized transmission electron microscopy, but found to convert readily chain structures inside SWCNT “nanoreactors”. energies possible determined computationally,...
A direct observation and an in-depth characterization of the steps by which bone mineral nucleates grows in extracellular matrix during earliest stages maturation, using relevant biomineralization models as they grow into mature mineral, is important research goal. To better understand process mineralization matrix, we used nanoanalytical electron microscopy techniques to examine vitro model formation. This study demonstrates presence three dominant CaP structures mineralizing osteoblast...
Komodo dragons (Varanus komodoensis) are the largest extant predatory lizards and their ziphodont (serrated, curved blade-shaped) teeth make them valuable analogues for studying tooth structure, function comparing with extinct taxa, such as theropod dinosaurs. Like other reptiles, V. komodoensis possess only a thin coating of enamel that is nevertheless able to cope demands puncture-pull feeding. Using advanced chemical structural imaging, we reveal unique adaptation maintaining cutting...
In this study, seven thermoresponsive methacrylate terpolymers with the same molar mass (MM) and composition but various architectures were successfully synthesized using group transfer polymerization (GTP). These based on tri(ethylene glycol) methyl ether (TEGMA, A unit), n-butyl (BuMA, B 2-(dimethylamino)ethyl (DMAEMA, C unit). Along more common ABC, ACB, BAC, statistical architectures, three diblock also investigated for first time, namely (AB)C, A(BC), B(AC); where units in brackets are...
There is a potential for silver nanowires (AgNWs) to be inhaled, but there little information on their health effects and chemical transformation inside the lungs in vivo. We studied of short (S-AgNWs; 1.5 μm) long (L-AgNWs; 10 instilled into Sprague-Dawley rats. S- L-AgNWs were phagocytosed degraded by macrophages; was no frustrated phagocytosis. Interestingly, both AgNWs internalized alveolar epithelial cells, with precipitation Ag2S surface as secondary nanoparticles. Quantitative serial...
Abstract Elemental phosphorus displays an impressive number of allotropes with highly diverse chemical and physical properties. White has now been filled into single‐wall carbon nanotubes (SWCNTs) from the liquid thereby stabilized against exothermic reaction atmospheric oxygen. The encapsulated tetraphosphorus molecules were visualized transmission electron microscopy, but found to convert readily chain structures inside SWCNT “nanoreactors”. energies possible determined computationally,...
Here we report the use of global and local magnetometry Hall probe imaging to investigate electromagnetic connectivity superconducting current path in oxygen-deficient fluorine-free Nd-based oxypnictides. High resolution transmission electron microscopy scanning show strongly layered crystallites, evidence for a ∼5 nm amorphous oxide around individual particles, second phase neodymium which may contribute large paramagnetic background at high field temperatures. From electrical transport...
Density functional theory calculations and electron energy loss spectroscopy indicate that the electronic structure of ordered orthorhombic MgSiN2 is similar to wurtzite AlN. A band gap 5.7 eV was calculated for both (indirect) AlN (direct) using Heyd-Scuseria-Ernzerhof approximation. Correction with respect experimental room-temperature indicates true 6.2 eV. has an additional direct 6.3 at Γ point.
Oxypnictide superconductor NdFeAsO0.85 sample was irradiated with 2 GeV Ta ions at a fluence of 5x10^10 ions/cm2. High resolution transmission electron microscopy study revealed that the irradiation produced columnar-like defects. The effect these defects on irreversible magnetisation in polycrystalline randomly oriented fragments studied as function field angle and sweep rate. We find critical current density is enhanced fields below matching (~1 Tesla) but only marginally. pinning...
Reverse osmosis membranes are used within the oil and gas industry for seawater desalination on off-shore oilrigs. The consist of three layers material: a polyester backing layer, polysulfone support polyamide (PA) thin film separating layer. It is generally thought that PA layer controls ion selectivity membrane but little understood about its structure or chemistry at molecular scale. This active synthesized by interfacial polymerization an organic/aqueous interface between...
Conditions affecting the brain are second leading cause of death globally. One main challenges for drugs targeting diseases is passing blood–brain barrier (BBB). Here, effectiveness mesoporous silica nanostars (MSiNSs) with two different spike lengths to cross an in vitro BBB multicellular model was evaluated and compared spherical nanoparticles (MSiNP). A modified sol–gel single-micelle epitaxial growth used produce MSiNS, which showed no cytotoxicity or immunogenicity at concentrations up...
Gold nanoparticles (AuNPs) fabricated<italic>via</italic>the self-assembly of block copolymers various architectures.
Hafnium‐containing compounds are of great importance to the semiconductor industry as a high‐κ gate dielectric replace silicon oxynitrides. Here, crystallization processes and chemistry bulk hafnia powders investigated, which will aid in interpretation reactions events occurring thin films used dielectrics. Amorphous powder was prepared via sol–gel route using precursor HfOCl 2 ·H O. The were subjected various heat treatments analyzed X‐ray diffraction thermal analysis techniques. A large...