Topics: Computational Fluid Dynamics, Electrokinetics, Nanofluidics, Computational Microfluidics

Research Statement: Our research deals with theoretical and numerical investigations of electrokinetic flow phenomena, including electrophoresis, electroosmosis, and diffusiophoresis. Electrokinetic flow phenomena occur near a charged surface under an imposed electric field or concentration gradient, typically when the length scale is an order of a nanometer. Nanoparticles suspended in an aqueous solution migrate under the reaction of an externally applied potential gradient (or concentration), and this phenomenon is known as electrophoresis (or diffusiophoresis). Electrophoresis and diffusiophoresis have broad applications in lab-on-a-chip devices for drug delivery, particle sorting, DNA sequencing, etc. Nanoparticles may be rigid, fully porous, core-shell particles, and liquid droplets. We develop mathematical models to investigate these particles' electrophoretic and diffusiophoretic motion through numerical and analytical solutions. Our research contributed significantly to analyze the impact of the surface hydrophobicity of the particles on the flow phenomena.

Journal Publications:

1. Partha Sarathi Majee, Analytical diffusiophoretic mobility solution of rigid colloids in a non-Newtonian power-law fluid, Physics of Fluids 38(1) 011704, (2026). DOI: https://doi.org/10.1063/5.0312236
2. Partha Sarathi Majee, Analytical Solution for Diffusiophoretic Mobility of a pH-dependent Soft Particle with a Hydrophobic Inner Core Incorporating the Ion Partitioning Effect, Physics of Fluids 37(9), 092028 (2025). DOI: https://doi.org/10.1063/5.0289395
3. Partha Sarathi Majee, Hiroyuki Ohshima, Analytical study on diffusiophoresis of soft particles: Role of surface-charge-mobility-dependent hydrophobic core, Physical Review E 111, 055407 (2025). DOI: https://doi.org/10.1103/PhysRevE.111.055407
4. Partha Sarathi Majee, Hiroyuki Ohshima, On diffusiophoresis of a soft particle with a hydrophobic inner core: A semianalytical study. Langmuir  41(2), 1469–1479 (2025) [IF- 3.7]. DOI: https://doi.org/10.1021/acs.langmuir.4c04525
5. Partha Sarathi Majee, Effect of ion partitioning on diffusiophoresis of a soft particle with hydrophobic core. Colloid and Polymer Science 301 (9), 1077-1089 (2023) [IF- 2.434]. DOI: https://doi.org/10.1007/s00396-023-05125-x 
6. Partha Sarathi Majee, S. Bhattacharyya, Impact of ion partitioning and double layer polarization on diffusiophoresis of a pH-regulated nanogel. Meccanica 56, 1989-2004 (2021) [IF-2.153].   DOI: https://doi.org/10.1007/s11012-021-01346-y.
7. Partha Sarathi Majee, S. Bhattacharyya, P. Dutta, On electrophoresis of a pH-regulated nanogel with ion partitioning effects. Electrophoresis 40(5), 699-709 (2019) [IF-3.081].  DOI: https://doi.org/10.1002/elps.201800291 .
8. S. Bhattacharyya, Partha Sarathi Majee, Nonlinear electrophoresis of a charged polarizable liquid droplet. Physics of Fluids 30(8), 082008 (2018) [IF-3.514].  DOI: https://doi.org/10.1063/1.5039819 .
9. Partha Sarathi Majee, S. Bhattacharyya, Electroosmotic flow around a dielectric uncharged particle by considering dielectric decrement effects. Colloids and Surfaces A: Physicochemical and Engineering Aspects 547, 37-48 (2018) [IF-3.99].  DOI: https://doi.org/10.1016/j.colsurfa.2018.03.037 .
10. Partha Sarathi Majee, S. Bhattacharyya, P. P. Gopmandal, H. Ohshima, On gel electrophoresis of dielectric charged particles with hydrophobic surface: A combined theoretical and numerical study. Electrophoresis 39 (5-6), 794-806 (2018) [IF-3.081].  DOI: https://doi.org/10.1002/elps.201700294 .
11. S. Bhattacharyya, Partha Sarathi Majee, Electrophoresis of a polarizable charged colloid with hydrophobic surface: A numerical study. Physical Review E 95(4), 042605 (2017) [IF-2.296].   DOI: https://doi.org/10.1103/PhysRevE.95.042605 .

• All papers are SCIE-indexed.

Conference Attended:

1. International Conference on Complex Analysis and Computational Fluid Dynamics (ICCACFD 2024), February 16-18, KIIT Deemed to be University, Bhubaneswar, India.
2. 13th World Congress on Computational Mechanics (WCCM 2018), July 22-27, 2018, New York City, New York, USA.
3. Fourth International Conference on Mathematics and Computing, January 9-11, 2018, Indian Institute of Technology (B.H.U.), Varanasi, India.
4. National Conference on Recent Developments in Numerical Techniques and its Applications, April 7-8, 2016, National Institute of Technology Patna, Patna, Bihar, India.
5. National Conference on Optimization and Computational Mathematics (NCOCM 2016), March 1-2, 2016, Vidyasagar University, Midnapore, West Bengal, India.

Project titled "Numerical Simulations Supplemented with Theoretical Analysis on Diffusiophoresis of Core-Shell Nanoparticles" under ANRF ARG-MATRICS program. (2026-2030)