Philipp Gutfreund

My main research interest is devoted to the microscopic structure and dynamics of polymeric liquids in out-of-equilibrium or in confinement. I use mainly Neutron Scattering techniques for my investigations with an emphasis on the in situ combination of shear/rheology and neutron scattering. I also work on the development of the reflectometry technique.

Some recent examples of my reasearch topics are:

• Structure of polymer brushes under in situ shear load.
  • “Polymer Brush Collapse under Shear Flow", Macromolecules50, 1215 (2017).
  • “Shear deformation of low-density polymer brushes in a good solvent”, Phys. Rev. E 98, 03251 (2018).

• Single-chain structure and dynamics of entangled polymers during non-Newtonian stationary flow.
  • "The viscoelastic signature underpinning polymer deformation under shear flow”, Soft Matter 15, 371 (2019).
  • "Direct Measurement of Topological Interactions In Polymers under Shear Using Neutron Spin Echo Spectroscopy", Scientific Reports9, 2823 (2019).
  • ”Dynamical structure of entangled polymers simulated under shear flow”, J. Chem. Phys. 149, 074901 (2018).

• Development of Neutron Reflectometry.
  • "Towards generalized data reduction on a chopper‐based time‐of-flight neutron reflectometer”, J. Appl. Cryst. 51, 606 (2018).
  • “Recent upgrades of the neutron reflectometer D17 at ILL”, J. Appl. Cryst. 51, 249 (2018).

• Analysis of off-specular Neutron Reflectometry.
  • “Överlåtaren: a fast way to transfer and orthogonalize two-dimensional off-specular reflectivity data”, J. Appl. Cryst. 49, 2091 (2016).
  • “Combined specular and off-specular reflectometry: elucidating the complex structure of soft buried interfaces”, J. Appl. Cryst. 54, 924 (2021). (pdf - 6.13 Mi)
  • “2D reflectometry for the investigation of polymer interfaces: off-specular neutron scattering”, J. Phys.: Condens. Matter 33, 364002 (2021). (pdf - 1.67 Mi)