A5084471991- Non-Destructive Testing Techniques
- Hydrogen embrittlement and corrosion behaviors in metals
- Nuclear and radioactivity studies
- Molecular Junctions and Nanostructures
- Nuclear Engineering Thermal-Hydraulics
- Advanced biosensing and bioanalysis techniques
- Nuclear reactor physics and engineering
- Nuclear Materials and Properties
- Corrosion Behavior and Inhibition
- Organic Electronics and Photovoltaics
- Perovskite Materials and Applications
- Fatigue and fracture mechanics
- Concrete Corrosion and Durability
- DNA and Nucleic Acid Chemistry
- Graphite, nuclear technology, radiation studies
- Material Properties and Failure Mechanisms
- High Temperature Alloys and Creep
- Conducting polymers and applications
- Advanced Fluorescence Microscopy Techniques
- Quantum and electron transport phenomena
- Porphyrin and Phthalocyanine Chemistry
- Quantum Dots Synthesis And Properties
- Strong Light-Matter Interactions
- Luminescence and Fluorescent Materials
- RNA Interference and Gene Delivery
Massachusetts Institute of Technology
2022-2025
University of Cambridge
2005-2023
Cavendish Hospital
2021
Dominion (United States)
1992-2017
Imperial College London
2016-2017
Transnational Press London
2016
Weatherford College
2013
Centre Hospitalier de Beauvais
2013
Sumitomo Electric Industries (United States)
2013
St. Edward's University
2009
Non-fullerene acceptors with optimized energy levels enable 10% efficient solar cells reduced voltage losses <0.6 V.
We have investigated coherent time evolution of pseudomolecular states an isolated (leadless) silicon double quantum dot, where operations are carried out via capacitively coupled elements. Manipulation is performed by short pulses applied to a nearby gate, and measurement single-electron transistor. The electrical isolation this qubit results in significantly longer coherence than previous reports for semiconductor charge qubits realized artificial molecules.
Traditionally, the properties and functions of covalent organic frameworks (COFs) are defined by their constituting building blocks, while chemical bonds that connect individual subunits have not attracted much attention as functional components final material. We developed a new series dual-pore perylene-based COFs demonstrated imine can be protonated reversibly, causing significant protonation-induced color shifts toward near-infrared, structure crystallinity fully retained. Thin films...
The work in this article is part of a project to develop quantitative description stress corrosion cracking (SCC) on the secondary side pressurized water reactor (PWR) steam generator tubing based existing information from operating plants and laboratory experiments. This second step developing predictive model for SCC side. first involved statistical framework into which dependencies various submodes can be inserted. results present will lead descriptions processes that, turn, incorporated...
The velocities of individual dislocations edge and mixed types in pure aluminum single crystals were determined as a function applied-resolved shear stress temperature. dislocation from measurements the displacements produced by pulses known duration. Berg-Barrett x-ray technique was employed to observe dislocations, 15 108 μsec duration applied propagating torsional waves along axes [111]-oriented cylindrical crystals. Resolved stresses up 16×106 dynes/cm2 at temperatures ranging −150°...
Strong-coupling between excitons and confined photonic modes can lead to the formation of new quasi-particles termed exciton-polaritons which display a range interesting properties such as super-fluidity, ultrafast transport Bose-Einstein condensation. typically occurs when an excitonic material is confided in dielectric or plasmonic microcavity. Here, we show polaritons form at room temperature chemically diverse, organic semiconductor thin films, despite absence external cavity. We find...
Singlet fission (SF), an exciton-doubling process observed in certain molecular semiconductors where two triplet excitons are generated from one singlet exciton, requires correctly tuned intermolecular coupling to allow separation of the triplets different units. We explore this using DNA-encoded assembly SF-capable pentacenes into discrete π-stacked constructs defined size and geometry. Precise structural control is achieved via a combination DNA duplex formation between complementary...
Abstract The work in this article is part of a project to develop quantitative description stress corrosion cracking (SCC) on the secondary side pressurized water reactor (PWR) steam generator tubing based existing information from operating plants and laboratory experiments. This second step developing predictive model for SCC side. first involved statistical framework into which dependencies various submodes can be inserted. results present will lead descriptions processes that, turn,...
Nucleic acid nanoparticles (NANPs) fabricated by using the DNA origami method have broad utility in materials science and bioengineering. Their site-specific, heterovalent functionalization with secondary molecules such as proteins or fluorophores is a unique feature of this technology that drives its utility. Currently, however, there are few chemistries enable fast, efficient covalent NANPs conjugate scope heterovalency. To address need, we introduce synthetic methods to access inverse...
Abstract The work in this article is part of a project to develop quantitative description stress corrosion cracking (SCC) on the secondary side pressurized water reactor (PWR) steam genera...
The creation of light-harvesting antenna complexes offers numerous potential applications in the field optoelectronics. Cesium lead halide nanocrystals, specifically, are beginning to show great promise for optoelectronic due their thermal stability and bright luminescence. As per majority all colloidally stable they process surface-bound ligands that offer surface state passivation. By replacing these with organic chromophores various energy interactions can be observed, leading a greater...
We present a statistical analysis of femtosecond transient absorption microscopy applied to four different organic semiconductor thin films based on perylene-diimide (PDI). By achieving temporal resolution 12 fs with simultaneous sub-10 nm spatial precision, we directly probe the underlying exciton transport characteristics within 3 ps after photoexcitation free model assumptions. Our study reveals sub-picosecond coherent (12–45 cm2 s–1) followed by diffusive phase (3–17 s–1). A comparison...
DNA scaffolds enable the activation and suppression of photochemistry between strongly-coupled synthetic chromophores.
We report the synthesis of two barbiturate end-capped non-fullerene acceptors and demonstrate their efficient function in high voltage output organic solar cells. The acceptor with lower LUMO level is shown to exhibit suppressed geminate recombination losses, resulting enhanced photocurrent generation higher overall device efficiency.
Natural photosystems use protein scaffolds to control intermolecular interactions that enable exciton flow, charge generation, and long-range separation. In contrast, there is limited structural in current organic electronic devices such as OLEDs solar cells. We report here the DNA-encoded assembly of π-conjugated perylene diimides (PDIs) with deterministic over number electronically coupled molecules. The PDIs are integrated within DNA chains using phosphoramidite coupling chemistry,...
Excitons are the molecular-scale currency of electronic energy. Control over excitons enables energy to be directed and harnessed for light harvesting, electronics, sensing. Excitonic circuits achieve such control by arranging electronically active molecules prescribe desired spatiotemporal dynamics. Photosynthetic solar conversion is a canonical example power excitonic circuits, where chromophores positioned in protein scaffold perform efficient capture, transport, charge separation....
The creation of artificial light-harvesting complexes involves the ordered arrangement chromophores in space. To guarantee efficient energy-transfer processes, organic dyes must be brought into close proximity, often leading to aggregation and formation excimer states. In recent years, attachment ligand-based nanoparticles has also generated interest relation improved solar harvesting spin-dependent electronic interactions such as singlet fission upconversion. We explore covalent two novel...
First Page
In order to provide background for a review of stress corrosion cracking (SCC) in nuclear power plants, is first presented the history occurrence SCC fossil fired plants and few related applications. The historical development then described. many materials components that have been affected by over years are identified, as material, stress, environmental factors involved. A particular focus this monograph question how it happened with significant susceptibility were used so important...
Abstract Exciton-polaritons (EPs) are quasiparticles formed by the hybridization of excitons with light modes. As organic semiconductors sustain stable at room-temperature, these materials being actively studied for room temperature polaritonic devices 1–3 . This is typically in form cavity-based systems, where molecules confined between metallic or dielectric mirrors 4–6 a plasmonic gap 7,8 In such systems strong light-matter coupling gives rise to polariton splittings on order 200 300 meV...
The formation of exciton-polaritons allows the transport energy over hundreds nanometres at velocities up to 10^6 m s^-1 in organic semiconductors films absence external cavity structures.