A5029687421- Nanopore and Nanochannel Transport Studies
- Nanofabrication and Lithography Techniques
- Molecular Junctions and Nanostructures
- Graphene research and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Force Microscopy Techniques and Applications
- Fuel Cells and Related Materials
- Membrane Separation Technologies
- Nanomaterials and Printing Technologies
- Nanowire Synthesis and Applications
- Electrostatics and Colloid Interactions
- Advanced Memory and Neural Computing
- Membrane-based Ion Separation Techniques
- Diamond and Carbon-based Materials Research
- Lattice Boltzmann Simulation Studies
- Mechanical and Optical Resonators
- Carbon Nanotubes in Composites
- Quantum-Dot Cellular Automata
- Advanced biosensing and bioanalysis techniques
- Nanocluster Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Fluid Dynamics and Thin Films
- Polymer Surface Interaction Studies
- Hydrogen Storage and Materials
- Advancements in Battery Materials
University of Manchester
2015-2024
Henry Royce Institute
2017-2024
SASTRA University
2018
Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine
2013-2016
Northwestern University
2013-2014
Jawaharlal Nehru Centre for Advanced Scientific Research
2009-2014
Institute of Materials Research and Engineering
2013
Agency for Science, Technology and Research
2013
Indian Institute of Technology Madras
2009
It has been an ultimate but seemingly distant goal of nanofluidics to controllably fabricate capillaries with dimensions approaching the size small ions and water molecules. We report ion transport through ultimately narrow slits that are fabricated by effectively removing a single atomic plane from bulk crystal. The atomically flat angstrom-scale exhibit little surface charge, allowing elucidation role steric effects. find hydrated diameters larger than slit can still permeate through,...
The dielectric constant of interfacial water has been predicted to be smaller than that bulk (= 80) because the rotational freedom dipoles is expected decrease near surfaces, yet experimental evidence lacking. We report local capacitance measurements for confined between two atomically-flat walls separated by various distances down 1 nm. Our experiments reveal presence an layer with vanishingly small polarization such its out-of-plane only approximately 2. electrically dead found three...
One-atom-thick crystals are impermeable to atoms and molecules, but hydrogen ions (thermal protons) penetrate through them. We show that monolayers of graphene boron nitride can be used separate ion isotopes. Using electrical measurements mass spectrometry, we found deuterons permeate these much slower than protons, resulting in a separation factor ≈10 at room temperature. The isotope effect is attributed difference ≈60 milli-electron volts between zero-point energies incident protons...
Fine-tuned ion transport across nanoscale pores is key to many biological processes, including neurotransmission. Recent advances have enabled the confinement of water and ions two dimensions, unveiling properties inaccessible at larger scales triggering hopes reproducing ionic machinery systems. Here we report experiments demonstrating emergence memory in aqueous electrolytes (sub)nanoscale channels. We unveil types nanofluidic memristors depending on channel material confinement, with...
Abstract Membrane-based applications such as osmotic power generation, desalination and molecular separation would benefit from decreasing water friction in nanoscale channels. However, mechanisms that allow fast flows are not fully understood yet. Here we report angstrom-scale capillaries made atomically flat crystals study the effect of confining walls’ material on friction. A massive difference is observed between channels isostructural graphite hexagonal boron nitride, which attributed...
It has long been an aspirational goal to create artificial structures that allow fast permeation of water but reject even the smallest hydrated ions, replicating feat achieved by nature in protein channels (e.g., aquaporins). Despite recent progress creating nanoscale pores and capillaries, these still remain distinctly larger than channels. We report capillaries made effectively extracting one atomic plane from bulk crystals, which leaves a two-dimensional slit few angstroms height. Water...
Three-dimensional hierarchical patterning of metals is paramount importance in diverse fields involving photonics, controlling surface wettability and wearable electronics. Conventionally, this type structuring tedious usually involves layer-by-layer lithographic patterning. Here, we describe a simple process direct nanoimprint lithography using palladium benzylthiolate, versatile metal-organic ink, which not only leads to the formation patterns but also amenable stacking metal over large...
Carbon materials are ubiquitous in energy storage; however, many of the fundamental electrochemical properties carbons still not fully understood. In this work, we studied capacitance highly ordered pyrolytic graphite (HOPG), with aim investigating specific ion effects seen basal plane and edge-oriented planes material. A series alkali metal cations, from Li+, Na+, K+, Rb+, Cs+ chloride as counterion, were used at a fixed electrolyte concentration. The potential relative to zero charge was...
Angstrom-scale fluidic channels are ubiquitous in nature and play an important role regulating cellular traffic, signaling, responding to stimuli. Synthetic angstrom now a reality with the emergence of several cutting-edge bottom-up top-down fabrication methods. In particular, use atomically thin 2D materials nanotubes as components build conduits has pushed limits scale. Here, we provide overview recent developments methods for nano- angstrofluidic while categorizing them on basis...
Nanoporous membranes based on two dimensional materials are predicted to provide highly selective gas transport in combination with extreme permeance. Here we investigate made from multilayer graphdiyne, a graphene-like crystal larger unit cell. Despite being nearly hundred of nanometers thick, the allow fast, Knudsen-type permeation light gases such as helium and hydrogen whereas heavy noble like xenon exhibit strongly suppressed flows. Using isotope cryogenic temperature measurements,...
Liquids confined down to the atomic scale can show radically new properties. However, only indirect and ensemble measurements operate in such extreme confinement, calling for novel optical approaches that enable direct imaging at molecular level. Here we harness fluorescence originating from single-photon emitters surface of hexagonal boron nitride sensing nanometrically liquids. The emission originates chemisorption organic solvent molecules onto native defects, revealing single-molecule...
The unique layered structure of graphite with its tunable interlayer distance establishes almost ideal conditions for the accommodation ions into structure. smooth and chemically inert nature surface also means that it is an substrate electrowetting. Here, we combine these two properties this material by demonstrating significant effect anion intercalation on electrowetting response graphitic surfaces in contact concentrated aqueous organic electrolytes as well ionic liquids. structural...
The physical electrochemistry of the carbon/ionic liquids interface underpins processes occurring in a vast range applications spanning electrochemical energy storage, iontronic devices, and lubrication. Elucidating charge storage mechanisms at carbon/electrolyte will lead to better understanding operational principles such systems. Herein, we probe stored double layer formed between model carbon systems, ranging from single-layer graphene graphite ionic liquid 1-ethyl-3-methylimidazolium...
We synthesized fluorescent, porphyrin-anchored, Au22 clusters in a single step, starting from well-characterized Au25 protected with glutathione (−SG) by combined core reduction/ligand exchange protocol, at liquid−liquid interface. The prepared cluster was characterized UV/vis, photoluminescence, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy, elemental analysis, and matrix-assisted laser desorption ionization mass spectrometry. absence of 672 nm intraband transition...
Flexible palladium-based H2 sensors have a great potential in advanced sensing applications, as they offer advantages such light weight, space conservation, and mechanical durability. Despite these advantages, the paucity of is due to fact that are difficult fabricate while maintaining excellent performance. Here, we demonstrate, using direct nanoimprint lithography palladium, fabrication flexible, durable, fast responsive sensor capable detecting gas concentration low 50 ppm. High...
Water inside a nanocapillary becomes ordered, resulting in unconventional behavior. A profound enhancement of water flow nanometer thin capillaries made graphene has been observed [Radha et al., Nature (London) 538, 222 (2016)]. Here, we explain this as due to the large density and extraordinary viscosity nanocapillaries. Using Hagen-Poiseuille theory with slippage-boundary condition incorporating disjoining pressure term combination results from molecular dynamics simulations, present an...
Abstract 2D nanoslit devices, where two crystals with atomically flat surfaces are separated by only a few nanometers, have attracted considerable attention because their tunable control over the confinement allows for discovery of unusual transport behavior gas, water, and ions. Here, passage double‐stranded DNA molecules is studied through nanoslits fabricated from exfoliated materials, such as graphene or hexagonal boron nitride, polymer examined in this tight confinement. Two types...