Arindam Chowdhury

Arindam Chowdhury
Indian Institute of Technology Bombay | IIT Bombay ·  Department of Chemistry

PhD

About

85
Publications
25,960
Reads
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2,815
Citations
Additional affiliations
August 2018 - present
Indian Institute of Technology Bombay, Powai, Mumbai, India
Position
  • Professor
July 2012 - present
Indian Institute of Technology Bombay
Position
  • Professor (Associate)
Description
  • Introduction to Physical Chemistry (CH107 - Electronic structure and chemical bonding), Molecular Spectroscopy
July 2012 - present
Indian Institute of Technology Bombay, Mumbai, India
Position
  • Professor (Associate)
Education
August 1997 - December 2002
Carnegie Mellon University
Field of study
  • Physical Chemistry
July 1995 - May 1997
July 1992 - June 1995

Publications

Publications (85)
Preprint
Liquid-liquid phase separation (LLPS) and subsequent liquid-to-solid transition is implicated in membraneless organelles formation as well as disease associated protein aggregation. However, how liquid-to-solid transition is initiated inside a liquid droplet remains unclear. Here, using studies at single droplet resolution, we show that liquid-to-s...
Article
Full-text available
Excellent optoelectronic properties make organometallic halide perovskites (OHPs) promising materials for solar photovoltaics and light-emitting devices, however, degradation under various atmospheric conditions severely restricts their potential. To realize stable OHP nanocrystals (NCs) and films resistant to adverse environmental effects, it is i...
Article
Tracking the movement of fluorescent single-molecule (SM) tracers has provided several new insights into the local structure and dynamics in complex environments such as soft materials and biological systems. However, SM tracking (SMT) remains unreliable at molecular length scales, as the localization error (LE) of SM trajectories (∼30-50 nm) is co...
Article
The study of controlling the morphology for designing advanced supramolecular architectures by tuning the molecular motif at the elemental level has been rarely carried out. Here, we report the synthesis of a nicotinic acid-conjugated selenopeptide, which induced the formation of an unbranched mesoscale elongated tubular morphology. We rationally d...
Preprint
Full-text available
div>Tracking the movement of fluorescent single-molecule (SM) tracers has provided several new insights on the local structure and dynamics in complex environments such as soft materials and biological systems. However, SM tracking (SMT) remains unreliable at molecular length scales, as the localization-error (LE) of SM trajectories (~30-50 nm) is...
Article
Full-text available
α-Synuclein (α-Syn) aggregation and amyloid formation is directly linked with Parkinson's disease pathogenesis. However, the early events involved in this process remain unclear. Here, using the in vitro reconstitution and cellular model, we show that liquid-liquid phase separation of α-Syn precedes its aggregation. In particular, in vitro generate...
Article
Supramolecular block copolymerzation with optically or electronically complementary monomers provides an attractive bottom-up approach for the non-covalent synthesis of nascent axial organic heterostructures, which promises to deliver useful applications in energy conversion, optoelectronics, and catalysis. However, the synthesis of supramolecular...
Article
In layered hybrid perovskites like (BA) 2 PbI 4 (BA = C 4 H 9 NH 3 ), electrons and holes are considered to be confined in atomically thin two dimensional (2D) Pb‐I inorganic layers. These inorganic layers are electronically isolated from each other in the third dimension by the insulating organic layers. Our experimental findings suggest the prese...
Article
In layered hybrid perovskites like (BA) 2 PbI 4 (BA = C 4 H 9 NH 3 ), electrons and holes are considered to be confined in atomically thin two dimensional (2D) Pb‐I inorganic layers. These inorganic layers are electronically isolated from each other in the third dimension by the insulating organic layers. Our experimental findings suggest the prese...
Article
Temporally stochastic, abrupt photoluminescence (PL) intermittency (blinking) has been long recognized to be characteristic of single quantum-emitters as intensity fluctuations average out over the ensemble. While there are a few rare examples of PL blinking in spatially extended (∼μm) yet quantum-confined (1 or 2-D) nanostructures, such phenomenon...
Article
Single molecule tracking experiments inside a hydrated polymer network have shown that the tracer motion is subdiffusive due to the viscoelastic environment inside the gel-like network. This property can be related to the negative autocorrelation of the instantaneous displacements at short times. Although the displacements of the individual tracers...
Article
Full-text available
Photo-luminescence (P-L) intermittency (or blinking) in semiconductor nanocrystals (NCs), a phenomenon ubiquitous to single-emitters, is generally considered to be temporally random intensity fluctuations between “bright” (“On”) and “dark” (“Off”) states. However, individual quantum-dots (QDs) rarely exhibit such telegraphic signals, and yet, a vas...
Article
Polymer nanocomposites are frequently not at equilibrium—therefore, the structure and properties critically depend on the protocol followed in their preparation. Here, we demonstrate that the elastic–brittle transition in highly loaded ice-templated polymer nanocomposites is sensitively determined by the conformation of polymer chains during nanoco...
Article
Polymer nanocomposites are frequently not at equilibrium—therefore, the structure and properties critically depend on the protocol followed in their preparation. Here, we demonstrate that the elastic–brittle transition in highly loaded ice-templated polymer nanocomposites is sensitively determined by the conformation of polymer chains during nanoco...
Preprint
Photo-luminescence intermittency (blinking) in semiconductor nanocrystals (NCs), a phenomenon ubiquitous to single-emitters, is generally considered to be temporally random intensity fluctuations between bright (On) and dark (Off) states. However, individual quantum-dots (QDs) rarely exhibit such telegraphic signal, and yet, the vast majority of si...
Preprint
Full-text available
α-Synuclein (α-Syn) aggregation and amyloid formation is directly linked with Parkinsons disease (PD) pathogenesis. However, the early events involved in this process remain unclear. Here, using in vitro reconstitution and cellular model, we show that liquid-liquid phase separation (LLPS) of α-Syn precedes its aggregation. In particular, in vitro g...
Article
Full-text available
Hybrid perovskites have attracted much attention as a promising photovoltaic material in the past few years. Typically these hybrid perovskites like methyl ammonium lead halides (MAPbX3) undergo dimensionality reduction from 3-D to 0-D and finally to PbX2 upon continuous moisture exposure. Our current study shows that 0-D perovskite related structu...
Article
Here, we report the synthesis of penta-selenopeptide comprising of five benzyl protected selenocysteine residues. This selenopeptide was well characterized by both one and two-dimensional (D) NMR spectroscopy. We find that...
Article
Full-text available
Abrupt fluorescence intermittency or blinking is long recognized to be characteristic of single nano‐emitters. Extended quantum‐confined nanostructures also undergo spatially heterogeneous blinking, however, there is no such precedence in dimensionally unconfined (bulk) materials. Here, we report multi‐level blinking of entire individual organo‐lea...
Article
Full-text available
Abrupt fluorescence intermittency or blinking is long recognized to be characteristic of single nano‐emitters. Extended quantum‐confined nanostructures also undergo spatially heterogeneous blinking, however, there is no such precedence in dimensionally unconfined (bulk) materials. Here, we report multi‐level blinking of entire individual organo‐lea...
Article
Full-text available
Recent reports on temporal photoluminescence (PL) intensity fluctuations (blinking) within localized domains of organo-metal lead halide (hybrid) perovskite micro-crystals have invoked considerable interest to understand their origins. Using PL microscopy, we have investigated the effect of atmospheric constituents and photo illumination on spatial...
Article
Full-text available
We use single particle tracking to investigate colloidal dynamics in hybrid assemblies comprising colloids enmeshed in a crosslinked polymer network. These assemblies are prepared using ice templating and are macroporous monolithic structures. We investigate microstructure-property relations in assemblies that appear chemically identical, but show...
Conference Paper
We use single particle tracking (SPT) to understand the local environment around colloidal probe particles in colloid-polymer hybrid structures. These hybrids were prepared using ice templating. We have shown that variation in the crosslinking protocol for hybrid formation can dramatically alter their mechanical response. Elastic, compressible spon...
Article
While fluorescence microscopy has become an essential tool amongst chemists and biologists for the detection of various analyte within cellular environments, non-uniform spatial distribution of sensors within cells often restricts extraction of reliable information on relative abundance of analyte in different subcellular regions. As an alternative...
Article
Full-text available
While dynamics of single-molecule (SM) fluorescent probes have been used to investigate structure and relaxation processes in polymers near glass transition temperature (Tg), it is difficult to perform SM imaging at elevated temperatures which restricts such studies to a limited number of polymers for which Tg is close to room temperature (RT). Pla...
Article
Full-text available
Glycopolypeptide-based self-assembled nano-/microstructures with surface-tethered carbohydrates are excellent mimics of glycoproteins on the cell surface. To expand the broad repertoire of glycopolypeptide-based supramolecular soft structures such as polymersomes formed via self-assembly of amphiphilic polymers, we have developed a new class of pol...
Article
A practical and convenient decarbonylation of a variety of aromatic, heteroaromatic and alkenyl aldehydes using palladium (Pd) nanoparticles supported on novel, fibrous nanosilica, named KCC-1-PEI/Pd have been developed. Complete conversion of aldehyde functionalities to deformylated products were achieved in all the cases and nearly in all the cyc...
Article
Full-text available
Water dispersible citrate-capped LaF3:Eu(5%) nanocrystals (NCs) have been partially surface-functionalized by 1,10-phenanthroline (phen) via a ligand exchange method to produce novel water dispersed citrate/phen-capped LaF3:Eu(5%) NCs in which citrate ligands preserve the water dispersibility of the NCs and phen ligands act as sensitizers of surfac...
Article
Full-text available
We report the synthesis of size controlled ZnO and rare-earth doped ZnO nanorods in the sub-10 nm diameter regime. The preferential growth of the nanostructures along the polar c-axis leads to the formation of wurtzite phase ZnO nanorods. The anisotropic growth is the manifestation of 'oriented attachment' kinetics. Photoluminescence measurements r...
Article
Full-text available
Graded interface core-shell nanocrystals (NCs) are being investigated to attain highly luminescent systems and are also anticipated to be “blinking-free” at the single particle level. In the present work, CdSe/ZnSe graded core/shell NCs with varying confinement potential profile are studied at single particle level. The internal structure of NCs is...
Article
Full-text available
Himangshu Prabal Goswami opened the discussion of the paper by Jörg Wrachtrup: When you describe the Hamiltonian, the coupling between the ancillary and sensor spin is g and the coupling between the sensor and sample spin is J i. Are these frequency dependent? If not, what is the quantitative range of g and J i under which they can be treated as sy...
Poster
Hybrid organic-inorganic Perovskite based materials have recently catered the growth of highly efficient low cost photovoltaic devices with energy conversion efficiencies reaching as high as 20%. A variety of organic, inorganic and halide components have been employed in ABX3 combination, allowing research communities all over the globe to tailor t...
Article
Full-text available
Traditional CdSe-based colloidal quantum dots (cQDs) have interesting photoluminescence (PL) properties. Herein we highlight the advantages in both ensemble and single-nanocrystal PL of colloidal CsPbBr3 nanocrystals (NCs) over the traditional cQDs. An ensemble of colloidal CsPbBr3 NCs (11 nm) exhibits ca. 90 % PL quantum yield with narrow (FWHM=86...
Article
Full-text available
A chemodosimteric reagent (1) for the efficient detection of cyanide species (CN− and/or HCN) in aq. medium as well as under physiological conditions has been described. Selective reaction of the cyanide species with this reagent in the presence of all common interfering anions, amino acids and glutathione (GSH) led to the generation of the corresp...
Article
Full-text available
Pseudo-halide thiocyanate (SCN-) anion has been used as a dopant in methyl ammonium lead tri-iodide (MAPbI3) framework, aiming for its use as an absorber layer for photovoltaic applications. The substitution of SCN- pseudo-halide anion, as verified using FT-IR spectroscopy, results in a comprehensive effect on the optical properties of the original...
Article
Amyloids are highly ordered protein/peptide aggregates associated with human diseases as well as various native biological functions. Given the diverse range of physiochemical properties of amyloids, we hypothesized that higher order amyloid self-assembly could be used for fabricating novel hydrogels for biomaterial applications. For proof of conce...
Article
Amyloids are highly ordered protein/peptide aggregates associated with human diseases as well as various native biological functions. Given the diverse range of physiochemical properties of amyloids, we hypothesized that higher order amyloid self-assembly could be used for fabricating novel hydrogels for biomaterial applications. For proof of conce...
Article
Full-text available
Glycopolypeptide based polymersomes can have promising applications as vehicles for targeted drug delivery since they are capable of encapsulating different pharmaceuticals of diverse polarity as well as interact with specific cell surfaces due to their hollow structural morphology and bioactive surfaces. We have synthesized glycopolypeptide-b-poly...
Article
Full-text available
A visible light excitable and colour tunable ~5% Eu3+-doped LaF3 nanocrystals (NCs) containing 9-oxidophenalenone ligands bound to the surface as visible light sensitizers for Eu3+ dopants, have been synthesized by a facile solution based method. The crystalline phase structure, size, composition, morphology and luminescence properties of the NCs a...
Poster
Full-text available
The luminescent lanthanide-doped nanocrystals (NCs) find a range of applications from optoelectronic devices and sensors to imaging1 of cells. The luminescence colour of these materials can be tuned simply by changing the dopant ion. The luminescence of lanthanides is easily quenched non-radiatively when Ln3+ ions are in close proximity to the vibr...
Article
Full-text available
Dynamics of small probe molecules have been routinely used to unravel the intrinsic details of charged ion transport in polymer brushes and polyelectrolyte multilayer (PEM) thin films. However, despite of numerous applications of isotropic thin films in material chemistry and medical purposes, corresponding morphological properties affected with ab...
Article
Full-text available
Spectral imaging using transmission grating (TG) based spectrographs has not been effectively utilized for spatially resolved absorption measurements of solid samples, and the role of spatial selection in spectral characteristics remains unexplored. We describe a simple yet efficient method to obtain reliable absorption spectra at sub micrometer sp...
Article
Full-text available
A multisignaling Hg(II) sensor based on a benzimidazole substituted BODIPY framework was designed, which displays excellent selectively toward Hg(II) in vitro and in vivo. Optical and fluorogenic measurements in solution reveal that the sensor can detect mercury ions at submicromolar concentrations, with high specificity. The detection of Hg(II) is...
Article
Full-text available
Extensively studied Mn-doped semiconductor nanocrystals have invariably exhibited photoluminescence over a narrow energy window of width ≤150 meV in the orange-red region and a surprisingly large spectral width (≥180 meV), contrary to its presumed atomic-like origin. Carrying out emission measurements on individual single nanocrystals and supported...