Skip to content

Before you write to us

Where our thinking comes from

Three review essays on where liquid coating processes stand and where they are headed — this lab's own reading of the field, written in Korean for a general engineering audience. If you want to know how we frame problems before you write to us, start here.

Field-Driven Ordering of Coated Particle Films

Open to Ph.D.

Particle spacing in a coated film is usually whatever the flow leaves behind. We treat it as a design variable: a magnetic field puts energy back into the wet layer so particles find their own spacing while the substrate keeps moving.

  • Build an overdamped discrete-element model of particles under magnetic, capillary, and viscous forces, and run it against blade-coating experiments between a pair of electromagnets.
  • Pin down the regime map in the magneto-thickening number Mt, the magnetic Bond number Boₘ, and the thickening index Γ that decides when field-assisted ordering actually works.
  • Carry the result from a batch demonstration to a continuously moving substrate, for optical films and electrodes whose performance depends on how evenly the particles sit.
Also relates to Multiscale Simulation
DEM simulation magnetophoresis blade coating thin-film microstructure

Background — Using a magnetic field as the energy source that rearranges particles in a coated film — and the dimensionless numbers that decide when it works. Read the research →

Phase-Field FEM Computation of Jets, Drops, and Coating Flows

Open to Ph.D. · Postdoc

Our phase-field finite element solver is built for free surfaces that deform and break — jets, drops, coating beads. It already holds material properties inside their physical bounds, follows a bubble rising through a viscoelastic liquid, and resolves ternary triple junctions. Two things are missing. This project is both.

  • Out of axisymmetry. Fully three-dimensional interfaces coupled to viscoelastic constitutive models — where a jet breaks asymmetrically and a coating bead stops being a 2-D cross-section.
  • Onto the GPU. The solver is CPU-bound, and that is the wall in front of every 3-D case. Porting it — assembly, solver, linear algebra — is the core of this project, not an afterthought.
  • Against experiment. DoS-CaBER filament thinning and coating-bead visualization are measured down the hall, so the computations have something to be wrong against.

A separate project from the phase-field LBM work on the next screen — different solver, different physics, different person. We are recruiting for both.

phase-field FEM GPU porting free-surface flow viscoelasticity CaBER

Background — Phase-field simulation of multiphase flows — rheologically robust interpolation, bubbles rising in viscoelastic liquids, and ternary systems. Read the research →

GPU Phase-Field LBM Simulation of Porous Media Flows

Open to Ph.D. · Postdoc

Our phase-field lattice Boltzmann solver is built for geometry that flow has to find its way through — porous media, where the interface topology changes constantly and explicit tracking gives up. Unlike the FEM solver, it already runs on GPU. This project starts there and pushes on scale.

  • Scale it out. Multi-GPU domain decomposition and the benchmark suite that turn a working kernel into a platform the whole lab can run. Three-dimensional pore structures do not fit on one device.
  • Displacement in real pore space. Two-phase flow through anisotropic porous media with the hybrid Allen–Cahn model — wettability, capillary fingering, and trapping as functions of the pore geometry, not of a lumped permeability.
  • Down to the electrode. Pore-scale transport through the microstructure our slurry work characterizes, so the simulation answers a question the lab already has.

A separate project from the phase-field FEM work on the previous screen — different solver, different physics, different person. We are recruiting for both.

Also relates to Multiscale Simulation
phase-field lattice Boltzmann GPU computing porous media multi-GPU scaling

Background — Phase-field simulation of multiphase flows — rheologically robust interpolation, bubbles rising in viscoelastic liquids, and ternary systems. Read the research →

Rheology and Microstructure of Battery Slurries

Open to Ph.D. · Postdoc

A concentrated slurry remembers how it was sheared. Rheology tells you it changed; it does not tell you what changed. This position works both ends — the flow response, and the structure underneath it.

  • Measure the nonlinear response. Step-up and step-down transients and large-amplitude oscillatory shear separate viscoelastic from thixotropic behavior, and expose the frictional contact network that flips a slurry between liquid-like and solid-like at rest.
  • See the structure directly. Low-field NMR relaxometry reads solvent mobility at particle surfaces; impedance spectroscopy reads the conductive network. Both run on the same samples as the rheology, so a flow signature and a structural one sit side by side.
  • Check it against simulation. Discrete-element simulation resolves the contacts that shear reorganizes; lattice Boltzmann resolves transport through the pore structure the probes report. Dispersant and binder chemistry enter both — the knobs a formulator can actually turn.
  • Put it on the robot. The shear protocols are already moving onto our automatic rheometer. Part of the work is judging which probes can follow, and what that buys in a closed-loop formulation search.

Open at either level — one measurement studied deeply, or several combined into a single picture of the microstructure.

nonlinear rheology LAOS LF-NMR EIS DEM lattice Boltzmann self-driving lab

Background — Transient stress, frictional contact networks, dispersant chemistry, and LF-NMR relaxometry in concentrated battery slurries. Read the research →

Innovative Slot Coating and Autonomous Coating Platforms

Open to Ph.D.

Slot coating decides whether an electrode can be made at all. A liquid bridge has to stay pinned between the die and a substrate moving at production speed — and for the patch and intermittent geometries batteries now demand, it has to start and stop cleanly too. Three directions, one project.

  • FEM computations. Two- and three-dimensional free-surface bead flow by finite element method, resolving the menisci that set the window boundaries. The same framework carries into the die — viscoplastic manifold flow, shim configuration, inverse design of the die lip — so the window is widened, not just mapped.
  • Physics-informed machine learning. PINNs whose loss embeds the finite-element residual, accelerating root finding along the window boundary where continuation is expensive, and giving a die designer a surrogate to query instead of a full re-run.
  • An autonomous coating platform. Blade and slot stations with in-line vision, driven by machine-readable recipes. Close the loop and the platform searches the window itself, with the computations above supplying the prior.

Our lab-scale roll-to-roll coater sits across all three: bead visualization is what the computations are checked against, and what the platform learns from.

slot coating patch coating coating window FEM computation PINN self-driving lab

Background — Slot and patch coating flows — operating windows, die-lip and manifold design, and the computation and visualization behind them. Read the research →

Processability Validation in a Self-Driving Laboratory

Open to Ph.D. · Postdoc

Materials-discovery labs ask which candidate is promising. Processability is the next question: can anything actually be made from it? A promising coin cell answers the first and says nothing about the second — that answer comes from whether the operating window of a real unit process opens for the material. Our self-driving platform settles it by running the process, and this position makes it do so for concentrated suspensions.

  • Judge the slurry, not the test cell. Processability is decided on the intermediate that enters the process — solids loading, viscosity, yield stress, thixotropy — and on whether a slot-die window then opens without streaks, agglomeration, or drying cracks.
  • Measure without stopping the run. Vision-based property measurement during mixing and an automatic rheometer on a robot, so the verdict forms while the experiment is still going.
  • Send failures back. A window that will not open is information. Bayesian optimization over physics-informed models picks the next run, and the failure conditions return to candidate design — the loop that makes a laboratory autonomous rather than merely automated.
  • Know where processability ends. A window that opens at 100 mm and 1 m/min is processability; whether it survives 800 mm and tens of m/min is scale-up, and a different failure. Statistical processability maps say which side a formulation sits on.

Measurement and decision are one loop, so the position is shaped around whichever end you are stronger at — open to doctoral and postdoctoral applicants alike.

self-driving lab processability validation operating window Bayesian optimization in-line analytics scale-up

Background — The physical self-driving lab we are building — liquid handling, mixing, coating, capping, in-line vision, and orchestration. Read the research →

How to apply

Send a concise cover letter and your CV to Prof. Jaewook Nam at jaewooknam@snu.ac.kr. Name the track you are applying to and say where your interest intersects with it — complex fluids in manufacturing processes for batteries, fuel cells, and optical films.

Industry-sponsored candidates are also welcome — emphasize your sponsorship in the cover letter and briefly describe the topic you wish to explore in partnership with your sponsor.

Contact

Jaewook Nam, Ph.D., M.Eng.
Room 917, Building No. 302, Seoul National University
1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
Office: +82-2-880-1654 · jaewooknam@snu.ac.kr