Showing 91 results for Author: Gernot Rother
Sep, 2026
Journal
Understanding CO2 nanobubble formation in water-saturated sandstone is critical for understanding fluid behavior in CO2 storage systems. Here, CO2 exsolution from an aqueous phase in a sandstone was investigated using small-angle neutron scattering at 50°C during cyclic depressurization from 12 to 0.7 MPa. Nanoscale heterogeneities consistent with CO2 clusters and nanobubb…
Aug, 2026
Journal
Bonse–Hart ultra-small-angle neutron scattering (USANS) provides access to micrometre-scale structure, but useful measurements often require long counting times. In this work, we test whether the expected smoothness of the scattering profile can be exploited to improve data quality at lower counting statistics. We apply a Gaussian-process-based method to Bonse–Hart USANS d…
Aug, 2026
Journal
A non-iterative analytical framework based on the truncated Abel inversion is developed for desmearing Bonse–Hart ultra-small-angle neutron scattering (USANS) data. The method directly inverts the slit-averaged intensity without empirical extrapolation or iterative regularization, establishing a closed-form relationship between the measured and intrinsic scattering profile…
Aug, 2026
Journal
Silica nanoparticles are expected to remain stable at alkaline pH because deprotonated silanol groups lead to a strong electrostatic interparticle repulsion. Here, we show that this mean-field expectation fails for ultrasmall silica nanoparticles. Electron microscopy, dynamic light scattering, and small-angle X-ray scattering (SAXS) show that 9 nm silica nanoparticles form…
Aug, 2026
Journal
Understanding COâ‚‚ nanobubble formation in water-saturated sandstone is critical for understanding fluid behaviour in COâ‚‚ storage systems. Here, CO2 exsolution from an aqueous phase in a sandstone was investigated using small-angle neutron scattering (SANS) at 50 °C during cyclic depressurisation from 12 to 0.7 MPa. Nanoscale heterogeneities consistent with CO2 clusters and…
Jul, 2026
Journal
Solvent-based absorption systems have emerged in the carbon capture space due to their high absorption capacities, reusability, and favorable energy requirements. Utilizing diethyl sebacate as a solvent for pre- and post-combustion carbon capture has advantages over other solvents, including high hydrophobicity, low viscosity, low vapor pressure, high CO2 solubility, high…
Jun, 2026
Journal
Ultra-small-angle neutron scattering (USANS) enables access to micrometer-scale structures but is intrinsically affected by strong, anisotropic resolution smearing arising from slit-geometry optics. As a result, recovery of the intrinsic scattering intensity constitutes an ill-posed inverse problem, and commonly used iterative desmearing methods lack rigorous uncertainty q…
May, 2026
Journal
Multiple scattering in small-angle neutron scattering (SANS) redistributes spectral weight and distorts structural interpretation, particularly for thick or strongly scattering samples. We develop a finite-dimensional spectral desmearing framework that corrects multiple scattering without resorting to integral transforms or model-dependent extrapolation. The primary intens…
Apr, 2026
Journal
Ultra-small-angle neutron scattering (USANS) using Bonse–Hart optics provides micrometer-scale structural insights but suffers from severe slit-geometry smearing. While well-established for isotropic systems, quantitative desmearing of anisotropic data remains a challenge because conventional corrections break down for non-radial scattering. We address this by developing a…
Oct, 2025
Journal
Microplastics (MPs) are pervasive environmental contaminants whose removal from water remains a major challenge due to their small size, chemical diversity, and dynamic surface properties arising from environmental aging/weathering. Here, we present a concept of foam-based separation method that physically traps MPs in the foam phase using microtubular assemblies of 12-hyd…
Mar, 2025
Journal
Greenhouse gas contributions to climate change have driven intense interest in the separation of CO2 from wet flue gas streams. Deep eutectic solvents (DESs) are an emerging class of highly selective CO2 absorbents. A prototypical DES, reline, is a mixture of choline chloride and urea. Reline is a thermally stable, nontoxic, and biodegradable solvent with negligible volati…
Sep, 2024
Journal
Mudrocks, ubiquitous yet poorly understood sedimentary rocks with significant variations in composition and physical properties, form seals for geological carbon dioxide and energy (e.g., hydrogen and methane) storage, repositories for radioactive waste disposal, and reservoirs for natural gas. Understanding the controls on mudrock pore structure is essential for evaluatin…