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Das, Siddhartha

Siddhartha Das
Assistant Professor
Department of Mechanical Engineering
3163 Glenn L. Martin Hall, Bldg. 088
College Park, MD 20742

Research Interests 

  • Soft Capillarity and Wetting
  • Soft Electrokinetics
  • Micro-nanoscale transport
  • Drops and Bubbles
  • Energy applications
  • Asphaltene
  • 3-D Printing
  • Water-2-D Material Interactions
  • Water transport in trees


Dr. Siddhartha Das joined the Department of Mechanical Engineering, University of Maryland, College Park in March, 2014. Dr. Das received his Ph.D. from the Indian Institute of Technology Kharagpur in 2010 in the area of theoretical microfluidics. Following his Ph.D., Dr. Das joined the Physics of Fluids Group in University of Twente, the Netherlands as a Postdoc and worked on surface nanobubbles, capillarity and soft wetting. After his stint in the Netherlands, Dr. Das went for his second Postdoc in the Department of Mechanical Engineering, University of Alberta, Canada. In Alberta, Dr. Das was honored with the Banting Postdoctoral Fellowship, the most prestigious postdoctoral fellowship of Canada.

Dr. Das' research interests span different areas of micro-nanoscale fluid mechanics and interactions of soft matter and complex interfaces with fluid mechanics. He is particularly interested in understanding issues such as the wetting of a soft solid, electrohydrodynamics past a soft interface, and evaporation-mediated self assembly of soft and rigid particles, mechanics of complex fluids during 3-D printing, interactions of liquid with 2-D materials like graphene and hexagonal Boron Nitride, micro-nanoscale water transport in trees, etc.

Dr. Das has authored nearly 90 journal publications, including publications in such prestigious journals as Proceedings of the National Academy of Sciences USA, Nature Communications, Advanced Materials, ACS Nano, Physical Review Letters, Physical Review E, Physics of Fluids, Soft Matter, Journal of Chemical Physics, Journal of Physical Chemistry, Journal of Applied Physics, and Scientific Reports.


  • Ph.D., Indian Institute of Technology, Kharagpur Department of Mechanical Engineering, 2010
  • B.Tech. (Hons.), Indian Institute of Technology, Kharagpur Department of Mechanical Engineering, 2005

Honors and Awards 

  • Recognized as the Outstanding Reviewer for the journal International Journal of Non-linear Mechanics (2015)
  • Honoree in 8th Annual University-Wide Celebration of Scholarship and Research (University of Maryland, College Park) (2015)
  • Banting Postdoctoral Fellowship (2011-2012)
  • Emerald Engineering Outstanding Doctoral Research Awards
  • High Value Ph.D. Fellowship, Indian Institute of Technology, Kharagpur
  • National Doctoral Fellowship, All India Council of Technical Education (AICTE)
  • Indian National Academy of Engineering (INAE) Innovative Students Project Award (Undergraduate Level)
  • S.P. Sengupta Memorial Award, Indian Institute of Technology (IIT) Kharagpur, India

Professional Memberships and Service 

  • Editorial Board, Nature Scientific Reports, Fluids and Plasma Physics
  • Americal Physical Society (APS)

Selected Publications 


  • Desai, P. R., Sinha, S., and Das, S. (2017) Compression of polymer brushes in weak interpenetration regime: Scaling Theory and Molecular Dynamics Simulations. Soft Matter (DOI: 10.1039/C7SM00466D).
  • Wang, Y., Andrews, J. E., Hu, L., and Das, S. (2017) Drop spreading on a superhydrophobic surface: Pinned contact line and bending liquid surface. Physical Chemistry Chemical Physics (DOI: 10.1039/C7CP01777D).
  • Andrews, J. E., Wang, Y., Sinha, S., Chung, P. W. and Das, S. (2017) Roughness-induced chemical heterogeneity leads to large hydrophobicity in wetting-translucent nanostructures. The Journal of Physical Chemistry C, 121, 10010-10017.
  • Chen, F., Gong, A., Zhu, M., Chen, G., Lacey, S., Jiang, F., Li, Y., Wang, Y., Dai, J., Yao, Y., Song, J., Liu, B., Fu, K., Das, S. and Hu, L. (2017) Mesoporous, three-dimensional wood membrane decorated with nanoparticles for highly efficient water treatment. ACS Nano, 11,  4275-4282.
  • Sinha, S., Jing, H., and Das, S. (2017) Charge inversion and external salt effect in semi- permeable membrane electrostatics. Journal of Membrane Science, 533, 364-377.
  • Chen, G. and Das, S. (2017) Massively enhanced electroosmotic transport in nanochannels grafted with end-charged polyelectrolyte brushes. The Journal of Physical Chemistry B, 121, 3130-3141.
  • Jing, H., Sinha, S., and Das, S. (2017) Elasto-electro-capillarity: Drop equilibrium on a charged, elastic solid. Soft Matter, 13, 554-566. (Selected as the Back Cover Article)
  • Wang, Y., Sun, G., Dai, J., Chen, G., Morgenstern, J., Wang, Y., Kang, S., Zhu, M., Das, S., Cui, L., and Hu, L. (2017) High-performance, low tortuosity wood carbon monolith reactor. Advanced Materials, 29, 1604257(1−8).


  • Razi, M., Sinha, S., Waghmare, P. R., Das, S. and Thundat, T. (2016) Effect of Steam- Assisted Gravity Drainage (SAGD) produced water properties on oil/water transient interfacial tension. Energy and Fuels, 30, 10714-10720.
  • Chen, G. and Das, S. (2016) Anomalous shrinking-swelling of nano-confined end charged polyelectrolyte brushes: Interplay of confinement and electrostatic effects. Journal of Physical Chemistry B, 120, 6848-6857.
  • Andrews, J., Sinha, S., Chung, P. W., and Das, S. (2016) Wetting dynamics of a water nanodrop on graphene. Physical Chemistry Chemical Physics, 18, 23482-23493. (Selected as the Inside Front Cover Article)
  • Chen, G., Li, H., and Das, S., (2016) Scaling relationships for spherical polymer brushes revisited. Journal of Physical Chemistry B, 120, 5272-5277
  • Karpitschka, S., Pandey, A., Lubbers, L. A., Weijs, J. H., Botton, L., Das, S., Andreotti, B., and Snoeijer, J. H. (2016) Inverted Cheerios effect: Liquid drops attract or repel by elasto-capillary. Proceedings of the National Academy of Sciences, USA USA 103, 7403-7407.
  • Liu, Z., Wang, Y., Wang, Z., Yao, Y., Dai, J., Das, S., and Hu. L. (2016) Solvo-thermal microwave-powered two-dimensional material exfoliation. Chemical Communications 52, 5757-5760.
  • Sinha, S. and Das, S. (2016) Role of Shuttleworth effect in adhesion on elastic surfaces. MRS Advances 1, 621-630.
  • Liu, Z., Zhang, L., Wang, R., Poyraz, S., Cook, J., Bozack, M., Das, S., Zhang, X., and Hu, L. (2016) Ultrafast microwave nano-manufacturing of fullerene-like metal chalcogenides. Scientific Reports 6, 22503(1-8).


  • Sinha, S and Das, S. (2015) Under-water adhesion of rigid spheres on soft, charged surfaces. Journal of Applied Physics 118, 195306(1-13).
  • Chen, G. and Das, S. (2015) Scaling laws and ionic current inversion in polyelectrolyte-grafted nanochannels. Journal of Physical Chemistry B 119, 12714-12726.
  • Liu, J., Gaikwad, R., Hande, A., Das, S., and Thundat, T. (2015) Mapping and quantifying surface charges on clay nanoparticles. Langmuir 31, 10469-10476.
  • Sinha, S.#, Mahmoud, K. A., and Das, S. (2015) Conditions for spontaneous oil-water separation with oil-water separators. RSC Advances 5, 80184-180191.
  • Das, S., Banik, M., Chen, G., Sinha, S., and Mukherjee, R. (2015) Polyelectrolyte brushes: Theory, modelling, synthesis and applications. Soft Matter 11, 8550-8583.
  • Hassanpourfard, M., Nikakhtari, Z., Ghosh, R., Das, S., Thundat, T., Liu, Y., and Kumar, A. (2015) Bacterial floc mediated rapid streamer formation in creeping flows. Scientific Reports 5, 13070(1-12).
  • Karpitschka, S., Das, S., van Gorcum, M., Perrin, H., Andreotti, B., and Snoeijer, J. H. (2015) Droplets move over viscoelastic substrates by surfing a ridge. Nature Communications, 4, 7891(1-7).
  • Chen, G. and Das, S. (2015) Electroosmotic transport in polyelectrolyte-grafted nanochannels with pH-dependent charge density. Journal of Applied Physics, 117, 185304.
  • McDaniel, K., Valcius, F., Andrews, J., and Das, S. (2015) Electrostatic potential distribution of a soft spherical particle with a charged core and pH dependent charge density. Colloids and Surfaces B: Biointerfaces, 127, 143-147.  (Selected as the Cover of the March 2015 issue of the journal)
  • Gaikwad, R., Hande, A., Das, S., Mitra, S. K., and Thundat, T (2015) Determination of charge on asphaltene nanoaggregates in air using electrostatic force microscopy. Langmuir, 31, 679-684.


  • Lubbers, L. A., Weijs, J. H., Botto, L., Das, S., Andreotti, B., and Snoeijer, J. H. (2014) Drops on soft solids: free energy and double transition of contact angles. Journal of Fluid Mechanics 747, R1.
  • Chanda, S. and Das, S. (2014) Effect of finite ion sizes in electrostatic potential distribution for a charged soft surface in contact with an electrolyte solution. Physical Review E 89, 012307 (1-5).
  • Mehranfar, M., Gaikwad, R., Das, S., Mitra, S. K., and Thundat, T. (2014) Effect of temperature on evaporation-triggered asphaltene nano-aggregates. Langmuir, 30, 800-804.
  • Das, S. and Kumar, A. (2014) Formation and post-formation dynamics of bacterial biofilm streamers as highly viscous liquid jets. Scientific Reports, 4, 7126.
  • Das, S., Chanda, S., Eijkel, J. C. T., Tas, N. R., Chakraborty, S., and Mitra, S. K. (2014) Filling of charged cylindrical capillaries. Physical Review E, 90, 043011.
  • Chanda, S., Sinha, S., and Das, S. (2014) Streaming potential and electroviscous effects in soft nanochannels: Towards designing more efficient nanofluidic electrochemomechanical energy converter. Soft Matter, 10, 7558-7568.


  • Das, S. and Mitra, S. K. (2013) Electric double-layer interactions in a wedge geometry: Change in contact angle for drops and bubbles. Physical Review E, 88, 033021 (1-8).
  • Das, S. and Mitra, S. K. (2013) Different regimes in vertical capillary filling. Physical Review E, 87, 063005 (1-7).
  • Waghmare, P. R., Das, S., and Mitra S. K. (2013) Drop deposition on under-liquid low energy surfaces. Soft Matter, 9, 7437-7447 (2013) (Selected as the Cover Article in 21st August, 2013 Issue of Soft Matter)
  • Waghmare, P. R., Das, S., and Mitra S. K. (2013) Under-water superoleophobic glass: Unexplored role of surfactant-rich solvent. Scientific Reports (Nature Publishing Group), 3, 1862 (1-7).
  • Misra, R. P., Das, S., and Mitra, S. K. (2013) Electric Double Layer force between charged surfaces: Effect of solvent polarization. The Journal of Chemical Physics, 138, 114703 (1-9).


  • Das, S., Waghmare, P. R., and Mitra, S. K. (2012) Early regimes of capillary filling. Physical Review E, 86, 067301 (1-5).
  • Marchand A., Das, S., Snoeijer, J. H., and Andreotti, B. (2012) Contact angles on a soft solid: From Young's law to Neumann's law. Physical Review Letters, 109, 236101 (1-5).
  • Das, S., Dubsky, P. van den Berg, A., and Eijkel, J. C. T. (2012) Concentration polarization in translocation of DNA through nanopores and nanochannels. Physical Review Letters, 108, 138101 (1-5).
  • Marchand A., Das, S., Snoeijer, J. H., and Andreotti, B. (2012) Capillary pressure and contact line force on a soft solid. Physical Review Letters, 108, 094301 (1-5).
  • Das, S., Mitra, S. K., and Chakraborty, S. (2012) Ring stains in the presence of electromagnetohydrodynamic interactions. Physical Review E, 86, 056317 (1-9).
  • Das, S., Mitra, S. K., and Chakraborty, S. (2012) Wenzel and Cassie-Baxter states of an electrolytic drop on charged surfaces. Physical Review E, 86, 011603 (1-9).
  • Das, S., Chakraborty, S., and Mitra, S. K. (2012) Redefining electrical double layer thickness in narrow confinements: Effect of solvent polarization. Physical Review E, 85, 051508 (1-6).
  • Das, S., Chakraborty, S., and Mitra, S. K. (2012) Ring stains in presence of electrokinetic interactions. Physical Review E, 85, 046311 (1-8).
  • Das, S. (2012) Electric-double-layer potential distribution in multiple-layer immiscible electrolytes: Effect of finite ion sizes. Physical Review E, 85, 012502 (1-5).


  • Andreotii, B., Marchand, A., Das, S., and Snoeijer, J. H. (2011) Elastocapillary instability under partial wetting conditions: Bending versus buckling. Physical Review E, 84, 061601 (1-11).  
  • Das, S. (2011). Effect of added salt on preformed surface nanobubbles: A scaling estimate. Physical Review E, 84, 036303 (1-9).
  • Das, S., and Hardt, S. (2011). Electric-Double-Layer potential distribution in multiple-layer immiscible electrolytes. Physical Review E, 84, 022502 (1-5).
  • Das, S., and Chakraborty, S. (2011). Steric-effect-induced enhancement of electrical-double-layer overlapping phenomena. Physical Review E, 84, 012501 (1-4).
  • Das, S., (2011). Effect of impurities in description of surface nanobubbles: Role of non-idealities in the surface layer. Physical Review E, 83, 066315 (1-14).
  • Das, S., Marchand, A., Andreotti, B., and Snoeijer, J. H. (2011). Elastic deformation due to tangential capillary forces. Physics of Fluids, 23, 072006 (1-11).


  • Das, S., Snoiejer, J. H., and Lohse, D. (2010). Effect of impurities in description of surface nanobubbles. Physical Review E, 82, 056310 (1-8).
  • Das, S., and Chakraborty, S. (2010). Effect of confinement on the collapsing mechanism of a flexible polymer chain. The Journal of Chemical Physics, 133, 174904 (1-15).
  • Das, S., and Chakraborty, S. (2010). Effect of conductivity variations within the Electric Double Layer on the streaming potential estimation in narrow fluidic confinements. Langmuir, 26, 11589-11596.


  • Das, T., Das, S., and Chakraborty, S. (2009). Influences of streaming potential on cross stream migration of flexible polymer molecules in nanochannel flows. The Journal of Chemical Physics, 130, 244904 (1-12).
  • Das, S., and Chakraborty, S. (2009). Influence of streaming potential on the transport and separation of charged spherical solutes in nanochannels subjected to particle-wall interactions. Langmuir, 25, 9863-9872.


  • Chakraborty, S., and Das, S. (2008) Streaming field induced convective transport and its influence on the electroviscous effects in narrow fluidic confinements beyond the Debye Hückel limits. Physical Review E, 77, 037303 (1-4).
  • Das, S., and Chakraborty, S. (2008). Transport and separation of charged macromolecules under nonlinear electromigration in nanochannels. Langmuir, 24, 7704-7710.


  • Das, S., and Chakraborty, S. (2007). Transverse electrodes for improved DNA hybridization in microchannels. AIChE Journal, 5, 1086-1099.


  • Das, S., and Chakraborty, S. (2006). Augmentation of macromolecular adsorption rate through transverse electric fields generated across patterned walls of a microfluidic channel. Journal of Applied Physics, 100, 014908 (1-8).
  • Das, S., and Chakraborty, S. (2006). Analytical solutions for velocity, temperature and concentration distribution in electroosmotic microchannel flows of a non-Newtonian bio-fluid. Analytica Chimica Acta, 559, 15-24.

Related News 

ME Researchers Develop Methods to Mediate Nanoparticle Adhesion
Research has the potential to improve drug delivery to stiffened cells.May 11, 2018

New Research on Polyelectrolyte Brush Bilayers Published in PRE
Paper establishes formation of interdigitated polyelectrolytes brush bilayers even for weak interdigitation.April 5, 2018

Five Mechanical Engineering Graduate Students Named Future Faculty Fellows
Clark School program prepares graduate students for future academic career.January 24, 2018

UMD Researchers Discover Methods to Mediate Membrane-Nanoparticle Interactions
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Graduate Student Panelist at International Student Event
Ph.D. candidate Shayandev Sinha was a featured panelist at UMD Graduate School International Students Event.October 9, 2017

UMD Researchers Explore Possibility of Making a Biological Cell Membrane Positive
Professor Siddhartha Das and graduate students shed light on possibility of making the plasma membrane of a biological cell positive.August 11, 2017

ME Faculty Part of NextFlex Award Winning Team
UMD faculty part of team to explore conformal sensors, 3-D antenna structures and non-planar circuit routing demonstrators.May 23, 2017

Wood filter removes toxic dye from water
Hu, Das flow water through wood in new use of natural materialsApril 20, 2017

Spotlight on NAVAIR-Funded Research at Maryland
Cooperative agreement between UMD and NAWCAD helps support research projects in Mechanical Engineering.March 16, 2017

Graduate Students Selected as Future Faculty Fellows
Seven graduate students were chosen as Clark School Future Faculty Fellows this year.March 7, 2017

UMD Research Makes Back Cover Soft Matter
Research sheds light on behavior of liquid drops on soft and charged elastic surfaces.February 1, 2017

Das Named Editorial Board Member of Nature's Scientific Reports
Das to serve on editorial board for Scientific Reports, Fluids and Plasma Physics category.January 31, 2017

Gemstone Team Mentored by Das Wins UMD Sustainability Grant
Department of Mechanical Engineering Assistant Professor Siddhartha Das mentors grant winning Team BACTERIA.December 9, 2016

Exploration of Graphene's Wetting Dynamics Could Open New Possibilities in Fluid Mechanics of Two-Dimensional Materials
New research could expand understanding of water/graphene interactions to open new possibilities in area of fluid mechanics of two-dimensional materials. August 31, 2016

Physics for Breakfast: Clark School Research in The New York Times
Research coauthored by Mechanical Engineering Assistant Professor Siddhartha Das is profiled in The New York Times.July 14, 2016

Drop-Drop Interactions on Soft Materials Unravel “Cheerios-Like” Behavior of Liquid Drops
Assistant Professor Siddhartha Das part of international team publishing new research in Proceedings of the National Academy of Sciences.June 14, 2016

Mechanical Engineering Graduate Student Volunteers during STEM Events
Ph.D. student Shayandev Sinha volunteered at E-Week 2016 and DC STEM Fair 2016.April 27, 2016

Five Mechanical Engineering Graduate Students Selected for Clark School Future Faculty Program
Graduate students selected for program designed to produce next great engineering professors.April 19, 2016

Surface Physics driven Nanomanufacturing opens up new possibilities of synthesizing Metal Chalcogenides Nanostructures
Assistant Professor Siddhartha Das publishes joint research outlining new method to synthesize Metal Chalcogenides Nanostructures.March 3, 2016

Mechanical Engineering Student Appointed to ASME-IPTI Collegiate Council
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Chen Awarded Northrop Grumman Graduate Fellowship in Engineering Education
Graduate student Guang Chen selected for a 2015-2016 Northrop Grumman fellowship.November 19, 2015

Surfing Liquid Drops Shed New Light in Soft Materials Research
New work published in Nature Communications could improve applications from cancer therapies and contact lenses to 3-D printing and mayonnaise.August 3, 2015

Das leads UMD undergraduate research team to publish cover article in Colloids and Surfaces B: Biointerfaces
Research provides new insights on effects of electrostatic charge & pH on virus biophysics and virus/bacteria interactions.April 8, 2015

Das publishes work on microfluidic bacterial biofilm streamer formation in Scientific Reports
New research investigates formation of filamentous structure—streamers—in microfluidic transport.December 5, 2014