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Paper Selection Instructions
- Choose ONE paper from the list below
- By the announced selection deadline: Confirm your choice with the instructor
- By the announced slide deadline: Submit your presentation slides
- Final session: Present during the two-hour presentation session
Presentation Requirements
- Duration: 10–12 minutes, followed by about 3 minutes of questions
- Format: Slides (PDF or PowerPoint)
- Content: See Presentation Guidelines
Paper 1: Brownian Motion and the Atomic Theory (1905)
Author: Albert Einstein
Title: “On the motion of small particles suspended in stationary liquids required by the molecular-kinetic theory of heat”
Journal: Annalen der Physik
Year: 1905
Why This Paper?
- Foundational paper providing evidence for atoms
- Explained Brownian motion as molecular collisions
- Quantified diffusion at molecular scale
- Direct experimental validation by Jean Perrin (1908)
Key Topics to Cover
- Historical context: Debate over atomic theory
- Einstein’s theoretical prediction: D = kT/(6πηr)
- Relationship between diffusion, temperature, particle size
- Perrin’s experimental validation
- Impact on soft matter and colloidal science
- Stochastic processes in physics
Connection to Course
- Lecture 1: Thermal energy scales (kBT)
- Foundational for understanding mesoscopic systems
- Entropy and fluctuations in soft matter
References
- Einstein, A. Ann. Phys. 17, 549 (1905)
- Perrin, J. Ann. Chim. Phys. 18, 5 (1909)
- Wikipedia: Brownian motion
Paper 2: Entropic Forces and Liquid Crystal Ordering (1949)
Author: Lars Onsager
Title: “The effects of shape on the interaction of colloidal particles”
Journal: Annals of the New York Academy of Sciences
Year: 1949
Why This Paper?
- Counter-intuitive: More order increases entropy!
- Shape alone can cause phase transitions
- Foundation for liquid crystal physics
- Shows power of entropy in soft matter
Key Topics to Cover
- Isotropic vs nematic phases
- Hard-rod model (purely repulsive interactions)
- Entropic ordering mechanism
- Role of packing fraction
- Translational vs orientational entropy
- Modern applications in colloidal liquid crystals
Connection to Course
- Lecture 1: Entropy-driven behavior
- Mesoscopic structure determining properties
- Phase transitions without attractive forces
References
- Onsager, L. Ann. N.Y. Acad. Sci. 51, 627 (1949)
- Frenkel, D. Physica A 263, 26 (1999)
- Recent work on DNA liquid crystals
Paper 3: Polymer Dynamics - Reptation (1971)
Author: Pierre-Gilles de Gennes
Title: “Reptation of a Polymer Chain in the Presence of Fixed Obstacles”
Journal: Journal of Chemical Physics
Year: 1971
Why This Paper?
- Revolutionary model for polymer rheology
- Nobel Prize work (1991)
- Molecular picture for viscoelasticity
- Explains dramatic viscosity changes
Key Topics to Cover
- Reptation (snake-like motion) concept
- Tube model for entangled polymers
- Scaling laws: D ~ N⁻², τ ~ N³
- Entanglement length and molecular weight
- Experimental validation
- Impact on polymer processing
Connection to Course
- Lecture 5: Viscoelastic behavior
- Lecture 6: Relaxation time and the Deborah number
- Microscopic origin of macroscopic properties
References
- de Gennes, P.G. J. Chem. Phys. 55, 572 (1971)
- Doi, M. & Edwards, S.F. “The Theory of Polymer Dynamics” (1986)
- Nobel lecture (1991)
Paper 4: Auxetic Materials (1987)
Author: Roderic S. Lakes
Title: “Foam Structures with a Negative Poisson’s Ratio”
Journal: Science
Year: 1987
Why This Paper?
- Counter-intuitive behavior: Expands when stretched!
- Opened field of mechanical metamaterials
- Design-driven material properties
- Engineering applications
Key Topics to Cover
- Poisson’s ratio (normal: positive, auxetic: negative)
- Re-entrant foam structure design
- Mechanical testing results (ν = -0.6)
- Enhanced energy absorption
- Stiffness improvements
- Modern metamaterials inspired by this work
Connection to Course
- Soft matter engineering
- Structure-property relationships
- Mesoscopic design principles
References
- Lakes, R.S. Science 235, 1038 (1987)
- Modern reviews on auxetic materials
- Applications in protective equipment, medical devices
Paper 5: Colloidal Glass Transition (1986)
Authors: P.N. Pusey & W. van Megen
Title: “Phase Behavior of Concentrated Suspensions of Nearly Hard Colloidal Spheres”
Journal: Nature
Year: 1986
Why This Paper?
- Established colloids as model system for glasses
- Bridged soft matter and condensed matter
- Demonstrated glassy dynamics experimentally
- Accessible system for theoretical validation
Key Topics to Cover
- Hard-sphere colloids
- Volume fraction dependence
- Dynamic light scattering technique
- Structural arrest at φ ~ 0.58
- Glass vs crystal transitions
- Modern applications (real-space imaging)
Connection to Course
- Soft matter phase transitions
- Role of packing and jamming
- Non-equilibrium phenomena
References
- Pusey, P.N. & van Megen, W. Nature 320, 340 (1986)
- van Megen, W. & Underwood, S.M. Nature 362, 616 (1993)
- Review: Hunter & Weeks Rep. Prog. Phys. (2012)
Paper 6: Jamming Concept (1998)
Authors: Andrea J. Liu & Sidney R. Nagel
Title: “Jamming is Not Just Cool Any More”
Journal: Nature
Year: 1998
Why This Paper?
- Unified disparate systems
- Jamming phase diagram concept
- Interdisciplinary impact
- Active research field today
Key Topics to Cover
- Jamming phase diagram (density, load, temperature)
- Granular media, foams, glasses unified
- “Fragile matter” concept
- Unjammed vs jammed states
- Critical packing fraction
- Modern jamming research
Connection to Course
- Lecture 5: Solid-like versus liquid-like response near jamming
- Transition from fluid to solid
- Non-equilibrium solidification
References
- Liu, A.J. & Nagel, S.R. Nature 396, 21 (1998)
- van Hecke, M. J. Phys. Condens. Matter 22, 033101 (2010)
- Modern jamming reviews
Paper 7: Active Matter - Vicsek Model (1995)
Authors: Tamás Vicsek et al.
Title: “Novel Type of Phase Transition in a System of Self-Driven Particles”
Journal: Physical Review Letters
Year: 1995
Why This Paper?
- Foundational for active matter field
- Simple model with rich behavior
- Non-equilibrium phase transition
- Applications from biology to robotics
Key Topics to Cover
- Vicsek model rules (alignment + noise)
- Phase transition to collective motion
- Order parameter (average velocity)
- Critical noise and density
- Biological examples (flocking, schooling)
- Modern active matter research
Connection to Course
- Beyond thermal equilibrium
- Collective behavior in soft matter
- Pattern formation
- Emergent phenomena
References
- Vicsek, T. et al. Phys. Rev. Lett. 75, 1226 (1995)
- Modern reviews on active matter
- Applications in self-propelled colloids, bacteria
Paper 8: Mechanobiology - Matrix Elasticity (2006)
Authors: Adam J. Engler, Shamik Sen, Dennis E. Discher
Title: “Matrix Elasticity Directs Stem Cell Lineage Specification”
Journal: Cell
Year: 2006
Why This Paper?
- Groundbreaking link between mechanics and biology
- Tissue engineering implications
- Showed cells sense and respond to stiffness
- Developmental biology insights
Key Topics to Cover
- Mesenchymal stem cells
- Substrate stiffness ranges:
- Soft (0.1-1 kPa) → neurons
- Medium (10 kPa) → muscle
- Stiff (30-40 kPa) → bone
- Mechanotransduction mechanism
- Myosin II inhibition experiments
- Impact on tissue engineering
Connection to Course
- Lectures 5–6: The elastic modulus as a control parameter
- Biological relevance of “softness”
- Real-world application of rheology
References
- Engler, A.J. et al. Cell 126, 677 (2006)
- Discher, D.E. et al. Science 310, 1139 (2005)
- Modern mechanobiology reviews
Paper 9: Soft Robotics - Multigait Robot (2011)
Authors: Robert F. Shepherd et al. (Whitesides group)
Title: “Multigait soft robot”
Journal: Proceedings of the National Academy of Sciences
Year: 2011
Why This Paper?
- Seminal soft robotics demonstration
- Pneumatic actuation principles
- Novel locomotion strategies
- Inspired new research field
Key Topics to Cover
- Silicone elastomer construction
- Pneumatic network design
- Multiple gaits (undulating, walking)
- Advantages over rigid robots:
- Impact resistance
- Squeezing through gaps
- Safe human interaction
- Modern soft robotics applications
Connection to Course
- Soft matter engineering
- Rubber elasticity in action
- Practical applications of material properties
References
- Shepherd, R.F. et al. Proc. Natl. Acad. Sci. 108, 20400 (2011)
- Reviews on soft robotics
- Medical and search-rescue applications
Paper 10: Shear Thickening - Dynamic Jamming (2012)
Authors: Scott R. Waitukaitis & Heinrich M. Jaeger
Title: “Impact-Activated Solidification of Dense Suspensions via Dynamic Jamming Fronts”
Journal: Nature
Year: 2012
Why This Paper?
- Explained famous “oobleck” behavior
- Novel mechanism (jamming fronts)
- High-speed imaging insights
- Impact-resistant material applications
Key Topics to Cover
- Cornstarch-water suspension properties
- Discontinuous shear thickening
- Dynamic jamming front propagation
- High-speed imaging and force measurements
- Grain jamming mechanism
- Applications in protective materials
Connection to Course
- Lectures 5–6: Non-Newtonian flow
- Dramatic material behavior changes
- Stress-dependent properties
- Connection to Paper 6 (jamming)
References
- Waitukaitis, S.R. & Jaeger, H.M. Nature 487, 205 (2012)
- Morris, J.F. Annu. Rev. Fluid Mech. 52, 121 (2020)
- Shear-thickening fluid applications
Paper Selection Process
Step 1: Review All Papers
- Read abstracts and summaries above
- Consider your interests
- Think about which connects to your background
Step 2: Select a Paper
- Email instructor with:
- First choice
- Second choice (backup)
- First-come, first-served for popular papers
- Instructor will confirm assignment
Step 3: Deep Dive
- Read paper thoroughly (multiple times)
- Research background/context
- Find supplementary materials
- Identify key figures to present
- Prepare questions you might receive
Step 4: Create the Presentation
- Follow Presentation Guidelines
- Include: context, methods, results, significance
- Practise timing (10–12 minutes)
- Submit slides 24 hours before class
Resources
Finding Papers
- University library access
- Google Scholar
- Ask instructor for PDF if access issues
Understanding Papers
- Read related reviews
- Check citation context
- Office hours for clarification
- Discuss with classmates (respectfully)
Creating Presentations
- PowerPoint / Keynote / Google Slides
- Include clear figures from paper
- Explain technical terms
- Visual aids important
Grading Criteria
See Lectures 7-8 for the full rubric.
The final presentation contributes 60% of the course grade. The split below is within the presentation mark.
Presentation (70%):
- Content understanding: 30%
- Clarity of explanation: 20%
- Visual aids: 10%
- Time management: 10%
Discussion (30%):
- Questions asked to peers: 15%
- Thoughtful responses to questions: 15%
Questions? Contact Dr. Sanjay during office hours or via email.
Paper selection deadline: Announced for the current course run
Slides submission deadline: Announced for the current course run
Presentations: Final two-hour course session
Course Home: Course Overview
Metadata
Author:: Vatsal Sanjay
Date published:: Jul 19, 2026
Date modified:: Jul 19, 2026
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