Josua Grawitter, MSc

I am a doctoral student at IRTG 1524 [2] working with Prof. Dr. Holger Stark [3]. Here, I study photoresponsive fluid interfaces based on switchable surfactants and substrates. Previously, I have worked on colloidal dynamical density functional theory (DDFT) for active particles. Find me on Twitter [4], Github [5], arXiv.org [6], and ORCiD [7]. My current research interests are:

• photoresponsive surfactants, light-driven microfluidic devices
• nonlocal diffusion-advection-reaction equations
• control methods for soft matter systems; feedback control
• boundary element method for creeping flow with moving boundaries

• J. Grawitter and H. Stark, Droplets on substrates with oscillating wettability [10], Soft Matter 17, 9469 (2021). doi:10.1039/D1SM01113H [11] arxiv:2108.01429 [12]
• J. Grawitter and H. Stark, Steering droplets on substrates using moving steps in wettability [13], Soft Matter 17, 2454 (2021). doi:10.1039/D0SM02082F [14] arxiv:2011.11587 [15]
• J. Grawitter, R. van Buel, C. Schaaf, and H. Stark, Dissipative systems with nonlocal delayed feedback control [16], New Journal of Physics 20, 113010 (2018). doi:10.1088/1367-2630/aae998 [17] arXiv:1806.04921 [18]
• J. Grawitter and H. Stark, Feedback control of photoresponsive fluid interfaces [19], Soft Matter 14, 1856 (2018). doi:10.1039/C7SM02101A [20] arxiv:1710.10226 [21]

• J. Grawitter and H. Stark, Steering and deforming droplets on substrates with switchable wettability [22], Dynamic Wetting of Flexible, Adaptive, and Switchable Substrates (2021), Freiburg (Germany) [talk].
• J. Grawitter and H. Stark, Droplets on substrates with uniform wettability oscillations, Control of Self-Organizing Nonlinear Systems [23] (2021), Potsdam (Germany) [poster].
• J. Grawitter and H. Stark, Simulating the hydrodynamics of droplets on photo-switchable substrates [24], Microscale Motion and Light (2019), Dresden (Germany) [talk].
• J. Grawitter, R. van Buel, C. Schaaf, and H. Stark, Dissipative systems with nonlocal delayed feedback [25], DPG spring meeting (2019), Regensburg (Germany) [talk].
• J. Grawitter and H. Stark, Simulating the hydrodynamics of droplets on photo-switchable substrates [26], DPG spring meeting (2019), Regensburg (Germany) [poster].
• J. Grawitter and H. Stark, Dissipative systems with nonlocal time-delayed feedback control, Nonequilibrium Collective Dynamics (2018) [27], Potsdam (Germany) [poster].
• J. Grawitter and H. Stark, Feedback-Control of Photoresponsive Fluid Interfaces [28], DPG spring meeting (2018), Berlin (Germany) [talk].
• J. Grawitter and H. Stark, Light-switchable molecules at planar fluid interfaces [29], DPG spring meeting (2017), Dresden (Germany) [talk].
• J. Grawitter and H. Stark, Dynamical density functional theory for hard, active disks [30], DPG spring meeting (2016), Regensburg (Germany) [poster].
• J. Grawitter and H. Stark, Dynamical density functional theory for mixtures of active and passive colloids, Nonequilibrium Collective Dynamics (2015) [31], Potsdam (Germany) [poster].