A5054015943- Material Dynamics and Properties
- Spectroscopy and Quantum Chemical Studies
- Electrostatics and Colloid Interactions
- Phase Equilibria and Thermodynamics
- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Chemical Physics Studies
- Force Microscopy Techniques and Applications
- Quantum, superfluid, helium dynamics
- Microfluidic and Capillary Electrophoresis Applications
- Block Copolymer Self-Assembly
- Advanced Polymer Synthesis and Characterization
- High-pressure geophysics and materials
- Textile materials and evaluations
- Gold and Silver Nanoparticles Synthesis and Applications
- Nuclear Physics and Applications
- Theoretical and Computational Physics
- nanoparticles nucleation surface interactions
- Pickering emulsions and particle stabilization
- X-ray Diffraction in Crystallography
- Advanced Physical and Chemical Molecular Interactions
- Rheology and Fluid Dynamics Studies
- Surface and Thin Film Phenomena
- Nanopore and Nanochannel Transport Studies
- Advanced Materials and Mechanics
MAX IV Laboratory
2019-2025
Lund University
2019-2025
Institute of Materials Science
2024
Wallenberg Wood Science Center
2023
Chalmers University of Technology
2023
University of Gothenburg
2012-2017
Paul Scherrer Institute
2008-2012
European Synchrotron Radiation Facility
2006-2012
University of Stuttgart
2011
University of Helsinki
2004-2009
The ForMAX beamline at the MAX IV Laboratory provides multiscale and multimodal structural characterization of hierarchical materials in nanometre to millimetre range by combining small- wide-angle X-ray scattering with full-field microtomography. modular design is optimized for easy switching between different experimental modalities. has a special focus on development novel fibrous from forest resources, but it also well suited studies within, example, food science biomedical research.
We have produced foams from cellulose nanofibrils upcycled cotton (upCNF) and wood (wCNF) through unidirectional (UIT) multidirectional ice-templating (MIT) investigated the structural humidity response in-situ WAXS, SAXS, micro tomography (μCT) between 10 95 % relative (RH). The upCNF wCNF WAXS patterns displayed a shape- position shift as RH was increased, with compression in (200) direction an elongation (004) direction. average separation distance extracted 1D SAXS revealed no...
We address the fundamental question: how are pair correlations and structure factors of hard-sphere fluids affected by confinement between hard planar walls at close distance? For this purpose, we combine x-ray scattering from colloid-filled nanofluidic channel arrays first-principles inhomogeneous liquid-state theory within anisotropic Percus-Yevick approximation. The experimental theoretical data in remarkable agreement pair-correlation level, providing first quantitative verification...
We report on salt-dependent interaction potentials of a single charged particle suspended in binary liquid mixture above wall. For symmetric boundary conditions (BC) we observe attractive particle-wall forces which are similar to critical Casimir previously observed salt-free mixtures. However, case antisymmetric BC find temperature-dependent crossover from repulsive is strong contrast conditions. Additionally performed small-angle X-ray scattering experiments demonstrate that the bulk...
Abstract For magnetic field orientation of nonstructures to become a viable method create high performance multifunctional nanocomposites, it is paramount importance develop that easy implement and can induce long‐range uniform nanostructural alignment. To overcome this challenge, inspired by low nuclear resonance (NMR) technology, highly uniform, strength, compact magnetic‐field nanostructure methodology presented for polymeric nanocomposites using Halbach array, the first time. Potential...
The temperature-dependent hydrogen-bond geometry in liquid water is studied by x-ray Compton scattering using synchrotron radiation combined with density functional theory analysis. Systematic changes, related to the weakening of hydrogen bonding, are observed shape profile upon increasing temperature. Using model calculations and published distribution functions geometries obtained from a NMR study we find significant correlation between length angle. This imposes new constraint on possible...
The structure of block copolymers results from the interplay between weak intermolecular forces, typically in order k(B)T per molecule. This is particularly true for copolymer thin films presence chemically patterned surfaces, where different contributions to total free energy, interfacial and bulklike terms, have comparable magnitudes. Here, we report on structures formed by equilibrated two surfaces with orthogonal stripes. Our experiments simulations reveal that domains are continuous...
We report on an in-situ observation of the colloidal silver nanoparticle self-assembly into a close-packed monolayer at air/water interface followed by 2D to 3D transition. Using fast tracking GISAXS technique, we were able observe immediate response compression self-assembled layer and identify all relevant intermediate stages including those far from equilibrium. In particular, new nonequilibrium phase before collapse via transition was found that is inaccessible competing direct space...
The self-assembly of nanoparticles on substrates is relevant for a variety applications such as plasmonics, sensing devices and nanometer-sized electronics.
The electron momentum density of water is measurable in an inelastic x-ray scattering experiment the form Compton profile. fine details profile, accessible by using high-brilliance synchrotron radiation, are sensitive to precise intra- and intermolecular geometries. We present a detailed quantitative computational study sensitivity different terms arising from intramolecular structure, nearest-neighbor interactions (hydrogen bonds), many-body properties (cooperativity anticooperativity...
A fluid consisting of solid particles that is confined within a narrow channel undergoes changes in, for example, its thermodynamic properties. Researchers investigate the density fluctuations and isothermal compressibilities spherical silica suspended in solvent subjected to nanoscopic confinement.
The collective diffusion of dense fluids in spatial confinement was studied by combining high-energy (21 keV) x-ray photon correlation spectroscopy and small-angle scattering from colloid-filled microfluidic channels. We found the structural relaxation to be slower compared bulk. dynamics is wave vector dependent, akin de Gennes narrowing typically observed bulk fluids. However, stark contrast bulk, structure factor are anisotropic. These experimental observations essential order develop a...
Abstract The fundamental parameter method using x‐ray fluorescence was applied to the quantitative determination of single and multiple layer thicknesses a compact experimental setup. Focused white‐beam radiation obtained from high‐voltage Mo tube spectra were acquired Peltier‐cooled Si solid‐state detector. results show that in case layers accuracy is very good whereas for structures agreement poorer, especially thinnest layers. This indicates possible drawback standard‐free thickness...
Spatial confinement modifies the microscopic structure of dense fluids, thereby inducing for example structural forces between confining walls. However, also fluids' density fluctuations, resulting in more elusive but equally important effects. In this brief review it is shown that both these phenomena are naturally analyzed using confined fluid's pair densities, which have recently become experimentally accessible. Two particular topics discussed, namely, mechanisms oscillatory profiles and...
We present an x-ray Compton scattering study on aqueous lithium chloride as a function of concentration, ranging from dilute solutions to saturation. The experimental observations are analyzed by simulations based model cluster calculations within the density functional theory. technique is found be sensitive predominantly ion-ion and ion-oxygen bond-length distributions well hydration number ion pairing. explain concentration-induced changes in ground-state electron momentum densities...
We have developed a unique approach for studying the ensemble-averaged nearest-neighbor coordination of confined fluids by combining small-angle X-ray scattering and phase-retrieval–based diffraction from fluid-filled nanofluidic channel arrays. apply method to charge-stabilized quasi–two-dimensional colloidal fluid (particle diameter 48 nm), focusing on structural transition monolayer bilayer with increasing film thickness. In contrast theoretical work paradigmatic hard-sphere fluid, we...
Pair distributions of fluids confined between two surfaces at close distance are fundamental importance for a variety physical, chemical, and biological phenomena, such as interactions macromolecules in solution, surface forces, diffusion narrow pores. However, contrast to bulk fluids, properties inhomogeneous seldom studied the pair-distribution level. Motivated by recent experimental advances determining anisotropic structure factors we analyze theoretically underlying pair archetypical...
Colloidal diffusion in confined geometries is analysed at the level of anisotropic pair densities.
We demonstrate that spatial confinement can be used to control the orientational and translational order of cubic nanoparticles. For this purpose we have combined X-ray scattering scanning electron microscopy study ordering iron oxide nanocubes self-assembled from toluene-based dispersions in nanofluidic channels. An analysis vector components with directions parallel perpendicular slit walls shows confining induce a preferential alignment nanocube (100) faces. Moreover, wall separations are...
The hydrogen-bond geometries in water and polycrystalline ice $\mathrm{I}h$ are studied using synchrotron radiation-based Compton scattering data of unprecedented statistical accuracy consistency. By combining the experimental with model calculations utilizing density functional theory, we show that technique provides unique complementary information on hydrogen bonding water. comparison indicates necessity including a local intra-intermolecular geometric correlation for water, relating...
Temperature-induced changes in the ground-state electron momentum density of polycrystalline ice Ih are studied with high accuracy by Compton scattering utilizing synchrotron radiation. A unique feasibility technique to provide direct experimental information on configurational enthalpies and heat capacities is demonstrated. The enthalpy, obtained an 1.5 meV, evolves linearly temperature above T=100 K. Consequently capacity found be constant, c{p}{config}=(0.44+/-0.11) J g{-1} K-1, this...
The isotope quantum effects in the ground-state electron momentum density of water are studied at temperatures ranging from 5to90°C by combining Compton scattering experiments utilizing synchrotron radiation and computational analysis within functional theory. We observe clear differences between normal heavy room temperature, which interpreted as predominantly reflecting intramolecular structural differences. changes upon increasing temperature found to be larger for than water, is...
Using x-ray diffraction from microfluidic channel arrays, we have determined concentration profiles of charge-stabilized silica colloids (radius 60+/-2 nm) confined between two like-charged dielectric walls at a few hundred nanometer distance. In solutions very low ionic strength, strongly repulsive Coulomb interactions drive the toward central region walls. The addition small quantity salt ions (0.2 mM) causes dense colloidal monolayer to be trapped near