Skip to main content

Research Repository

Advanced Search

All Outputs (13)

Equilibrium of fluid membranes endowed with orientational order (2017)
Journal Article
Kumar Alageshan, J., Chakrabarti, B., & Hatwalne, Y. (2017). Equilibrium of fluid membranes endowed with orientational order. Physical Review E, 95(4), Article 042806. https://doi.org/10.1103/physreve.95.042806

Minimization of the low-temperature elastic free-energy functional of orientationlly ordered membranes involves independent variation of the membrane-shape, while keeping the orientational order on it (its texture) fixed. We propose an operational, c... Read More about Equilibrium of fluid membranes endowed with orientational order.

Elasticity of smectic liquid crystals with in-plane orientational order and dispiration asymmetry (2017)
Journal Article
Alageshan, J. K., Chakrabarti, B., & Hatwalne, Y. (2017). Elasticity of smectic liquid crystals with in-plane orientational order and dispiration asymmetry. Physical Review E, 95(2), Article 022701. https://doi.org/10.1103/physreve.95.022701

The Nelson-Peliti formulation of the elasticity theory of isolated fluid membranes with orientational order emphasizes the interplay between geometry, topology, and thermal fluctuations. Fluid layers of lamellar liquid crystals such as smectic-C, hex... Read More about Elasticity of smectic liquid crystals with in-plane orientational order and dispiration asymmetry.

Elasticity dominated surface segregation of small molecules in polymer mixtures (2016)
Journal Article
Krawczyk, J., Croce, S., McLeish, T., & Chakrabarti, B. (2016). Elasticity dominated surface segregation of small molecules in polymer mixtures. Physical Review Letters, 116(20), Article 208301. https://doi.org/10.1103/physrevlett.116.208301

We study the phenomenon of migration of the small molecular weight component of a binary polymer mixture to the free surface using mean field and self-consistent field theories. By proposing a free energy functional that incorporates polymer-matrix e... Read More about Elasticity dominated surface segregation of small molecules in polymer mixtures.

Delayed self-regulation and time-dependent chemical drive leads to novel states in epigenetic landscapes (2014)
Journal Article
Mitra, M., Taylor, P., Hutchison, C., McLeish, T., & Chakrabarti, B. (2014). Delayed self-regulation and time-dependent chemical drive leads to novel states in epigenetic landscapes. Journal of the Royal Society. Interface, 11(100), https://doi.org/10.1098/rsif.2014.0706

The epigenetic pathway of a cell as it differentiates from a stem cell state to a mature lineage-committed one has been historically understood in terms of Waddington's landscape, consisting of hills and valleys. The smooth top and valley-strewn bott... Read More about Delayed self-regulation and time-dependent chemical drive leads to novel states in epigenetic landscapes.

Equilibrium Morphologies and Force Extension Behavior for Polymers with Hydrophobic Patches: Role of Quenched Disorder (2014)
Journal Article
Mishra, A., Panwar, A., & Chakrabarti, B. (2014). Equilibrium Morphologies and Force Extension Behavior for Polymers with Hydrophobic Patches: Role of Quenched Disorder. Macromolecular Theory and Simulations, 23(4), 266-278. https://doi.org/10.1002/mats.201300154

Equilibrium morphologies and mechanical properties of copolymers with hydrophobic segments are explored using Langevin dynamics simulations. The interplay between different length scales, namely, persistence length ℓp, and disorder correlation length... Read More about Equilibrium Morphologies and Force Extension Behavior for Polymers with Hydrophobic Patches: Role of Quenched Disorder.

Theoretical analysis for the optical deformation of emulsion droplets (2014)
Journal Article
Tapp, D., Taylor, J., Lubansky, A., Bain, C., & Chakrabarti, B. (2014). Theoretical analysis for the optical deformation of emulsion droplets. Optics Express, 22(4), 4523-4538. https://doi.org/10.1364/oe.22.004523

We propose a theoretical framework to predict the three-dimensional shapes of optically deformed micron-sized emulsion droplets with ultra-low interfacial tension. The resulting shape and size of the droplet arises out of a balance between the interf... Read More about Theoretical analysis for the optical deformation of emulsion droplets.

Monte Carlo Simulation of Geminate Pair Recombination Dynamics in Organic Photovoltaic Devices: Multi-Exponential, Field-Dependent Kinetics and Its Interpretation (2014)
Journal Article
Jones, L., Chakrabarti, B., & Groves, C. (2014). Monte Carlo Simulation of Geminate Pair Recombination Dynamics in Organic Photovoltaic Devices: Multi-Exponential, Field-Dependent Kinetics and Its Interpretation. Journal of Physical Chemistry C, 118(1), 85-91. https://doi.org/10.1021/jp408063f

Monte Carlo simulations are used to examine charge-transfer (CT) state recombination dynamics considering the effects of energetic disorder and bulk heterojunction morphology. Strongly biexponential recombination kinetics were observed, in agreement... Read More about Monte Carlo Simulation of Geminate Pair Recombination Dynamics in Organic Photovoltaic Devices: Multi-Exponential, Field-Dependent Kinetics and Its Interpretation.

Co(II)-detection does not follow Kco(II) gradient: channelling in Co(II)-sensing (2013)
Journal Article
Patterson, C., Pernil, R., Dainty, S., Chakrabarti, B., Henry, C., Money, V., …Robinson, N. (2013). Co(II)-detection does not follow Kco(II) gradient: channelling in Co(II)-sensing. Metallomics, 5(4), 352-362. https://doi.org/10.1039/c3mt20241k

The MerR-like transcriptional activator CoaR detects surplus Co(II) to regulate Co(II) efflux in a cyanobacterium. This organism also has cytosolic metal-sensors from three further families represented by Zn(II)-sensors ZiaR and Zur plus Ni(II)-senso... Read More about Co(II)-detection does not follow Kco(II) gradient: channelling in Co(II)-sensing.

Biopolymer hairpin loops sustained by polarons (2012)
Journal Article
Chakrabarti, B., Piette, B., & Zakrzewski, W. (2012). Biopolymer hairpin loops sustained by polarons. Physical review E: Statistical, nonlinear, and soft matter physics, 86(2), Article 021910. https://doi.org/10.1103/physreve.86.021910

We show that polarons can sustain looplike configurations in flexible biopolymers and that the size of the loops depend on both the flexural rigidity of the polymer and the electron-phonon coupling constant. In particular we show that for single stra... Read More about Biopolymer hairpin loops sustained by polarons.

Frequency-dependent chemolocation and chemotactic target selection (2010)
Journal Article
Nowak, S., Chakrabarti, B., Chou, T., & Gopinathan, A. (2010). Frequency-dependent chemolocation and chemotactic target selection. Physical Biology, 7(2), Article 026003. https://doi.org/10.1088/1478-3975/7/2/026003

Chemotaxis is typically modeled in the context of cellular motion toward a static, exogenous source of chemoattractant. Here we propose a time-dependent mechanism of chemotaxis in which a self-propelled particle (e.g. a cell) releases a chemical that... Read More about Frequency-dependent chemolocation and chemotactic target selection.

Shear Unzipping of DNA (2009)
Journal Article
Chakrabarti, B., & Nelson, D. (2009). Shear Unzipping of DNA. Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry), 113(12), 3831-3836. https://doi.org/10.1021/jp808232p

We study theoretically the mechanical failure of a simple model of double-stranded DNA under an applied shear. Starting from a more microscopic Hamiltonian that describes a sheared DNA, we arrive at a nonlinear generalization of a ladder model of she... Read More about Shear Unzipping of DNA.

Orientation-dependent interactions of DNA with an alpha-hemolysin channel (2008)
Journal Article
Wanunu, M., Chakrabarti, B., Mathe, J., Nelson, D., & Meller, A. (2008). Orientation-dependent interactions of DNA with an alpha-hemolysin channel. Physical review E: Statistical, nonlinear, and soft matter physics, 77(3), Article 031904. https://doi.org/10.1103/physreve.77.031904

We present experimental and theoretical results on the voltage-dependent escape dynamics of DNA hairpins of different orientations threaded into an α-hemolysin channel. Using a coarse-grained formulation, we map the motion of the polymer in the pore... Read More about Orientation-dependent interactions of DNA with an alpha-hemolysin channel.