Contact

  • Academic
    brinthan@stanford.edu
    University - Student Department: Materials Science and Engineering Position: Graduate

Additional Info

  • Mail Code: 4034

All Publications

  • A percolating path to green iron. Cell reports. Physical science Paul, S., Kanesalingam, B., Ma, Y., Villanova, J., Requena, G., Akpu, S. C., Raabe, D., Battiato, I., Dresselhaus-Marais, L. 2025; 6 (8): 102729

    Abstract

    About 1.9 gigatons of steel is produced every year, emitting 8% (3.6 gigatons) of global CO2 in the process. More than 50% of the CO2 emissions come from a single step of steel production, known as ironmaking. Hydrogen-based direct reduction (HyDR) of iron oxide to iron has emerged as an emission-free ironmaking alternative. However, multiple physical and chemical phenomena ranging from nanometers to meters inside HyDR reactors alter the microstructure and pore networks in iron oxide pellets, in ways that resist gaseous transport of H2/H2O, slow reaction rates, and disrupt continuous reactor operation. Using synchrotron nano X-ray computed tomography and percolation theory, we quantify the evolution of pores in iron oxide pellets and demonstrate how nanoscale pore connectivity influences micro- and macroscale flow properties such as permeability, diffusivity, and tortuosity. Our modeling framework connects disparate scales and offers opportunities to accelerate HyDR.

    View details for DOI 10.1016/j.xcrp.2025.102729

    View details for PubMedID 40861821

    View details for PubMedCentralID PMC12374072

  • Oblique diffraction geometry for the observation of several non-coplanar Bragg reflections under identical illumination. Journal of applied crystallography Detlefs, C., Henningsson, A., Kanesalingam, B., Cretton, A. A., Corley-Wiciak, C., Frankus, F. T., Pal, D., Irvine, S., Borgi, S., Poulsen, H. F., Yildirim, C., Dresselhaus-Marais, L. E. 2025; 58 (Pt 4): 1439-1446

    Abstract

    A method to determine the strain tensor and local lattice rotation with dark-field X-ray microscopy is presented. Using a set of at least three non-coplanar symmetry-equivalent Bragg reflections, the illuminated volume of the sample can be kept constant for all reflections, facilitating easy registration of the measured lattice variations. This requires an oblique diffraction geometry, i.e. the diffraction plane is neither horizontal nor vertical. We derive a closed analytical expression that allows determination of the strain and lattice rotation from the deviation of experimental observables (e.g. goniometer angles) from their nominal values for an unstrained lattice.

    View details for DOI 10.1107/S1600576725005862

    View details for PubMedID 40765970