A5008272368- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Body Contouring and Surgery
- Radiomics and Machine Learning in Medical Imaging
- Advanced biosensing and bioanalysis techniques
- Body Image and Dysmorphia Studies
- Gold and Silver Nanoparticles Synthesis and Applications
- Microfluidic and Capillary Electrophoresis Applications
- Nuclear Engineering Thermal-Hydraulics
- Block Copolymer Self-Assembly
- Liquid Crystal Research Advancements
- Enzyme Structure and Function
- Nanocluster Synthesis and Applications
- Fibromyalgia and Chronic Fatigue Syndrome Research
- Conducting polymers and applications
- Rheology and Fluid Dynamics Studies
- Neurology and Historical Studies
- Force Microscopy Techniques and Applications
- Photonic Crystals and Applications
- Optical measurement and interference techniques
- Sports Dynamics and Biomechanics
- Supramolecular Self-Assembly in Materials
- Cancer Diagnosis and Treatment
- Plant Reproductive Biology
- Tumors and Oncological Cases
McGill University
2016-2021
Brookhaven National Laboratory
2017-2020
Blue phases (BPs), a distinct class of liquid crystals (LCs) with 3D periodic ordering double twist cylinders involving orthogonal helical director twists, have been theoretically studied as potential templates for tunable colloidal crystals. Here, we report the spontaneous formation thermally reversible, cubic crystal nanoparticle (NP) assemblies in BPs. Gold NPs, functionalized to be highly miscible cyanobiphenyl-based LCs, were dispersed BP mixtures and characterized by polarized optical...
The quest for the by-design assembly of material and devices from nanoscale inorganic components is well recognized. Conventional self-assembly often limited in its ability to control morphology structure simultaneously. Here, we report a general method assembling nanoparticles linear "pillar" with regulated internal configurations. Our approach inspired by supramolecular systems, where intermolecular stacking guides process form diverse morphologies. Programmable interactions were realized...
We present a small-angle coherent x-ray scattering technique used for measuring flow velocities in slow moving materials. The is an extension of X-ray Photon Correlation Spectroscopy (XPCS): It involves mixing the from tracer particles with static reference that heterodynes signal. This acts to elongate temporal effects caused by homodyne measurements, allowing more robust measurement properties. Using heterodyning, ranging 0.1 10 μm/s were measured viscous fluid pushed through rectangular...
X-ray scattering images contain numerous gaps and defects arising from detector limitations experimental configuration. We present a method to heal images, filling in the data removing physically meaningful manner. Unlike generic inpainting methods, this is closely tuned expected structure of reciprocal-space data. In particular, we exploit statistical tests symmetry analysis identify an image; then copy, average interpolate measured into way that respects identified symmetry. Importantly,...
Suppressing the crystallization of polyether-based solid electrolytes is a widely sought-after strategy to improve ionic conductivity. We report effects nanoconfinement on polyethylene oxide electrolytes. find that neat responds by adopting preferred orientation yet able crystallize even in volumes with widths as small 8 nm. However, combination and salt addition does suppress polymer at room temperature though either factor alone cannot. Such synergistic suppression has implications for...
The ability to measure small deformations or strains is useful for understanding many aspects of materials. Here, a new analysis speckle diffraction peaks presented in which the systematic shifts speckles are analyzed allowing strain (or flow) patterns be inferred. This tracking technique measures with accuracy similar x-ray single crystal measurements but amorphous highly disordered
As self-assembling nanomaterials become more sophisticated, it is becoming increasingly important to measure the structural order of finite-sized assemblies nano-objects. These mesoscale clusters represent an acute challenge conventional probes, owing range implicated size scales (10 nm several micrometres), weak scattering signal and dynamic nature meso-clusters in native solution environments. The high X-ray flux coherence modern synchrotrons present opportunity extract information from...
Complex fluids near interfaces or confined within nanoscale volumes can exhibit substantial shifts in physical properties compared to bulk, including glass transition temperature, phase separation, and crystallization. Because studies of these effects typically use thin film samples with one dimension confinement, it is generally unclear how more extreme spatial confinement may influence properties. In this work, we used x-ray photon correlation spectroscopy gold nanoprobes characterize...
X-ray scattering is a key technique in modern synchrotron facilities towards material analysis and discovery via structural characterization at the molecular scale nano-scale. Image classification tagging play crucial role recognizing patterns, inferring meaningful physical properties from sample, guiding subsequent experiment steps. We designed deeplearning based image pipelines gained significant improvements terms of accuracy speed. Constrained by available computing resources...
Small-angle X-ray scattering (SAXS) often includes an unwanted background, which increases the required measurement time to resolve sample structure. This is undesirable in all experiments, and may make of dynamic or radiation-sensitive samples impossible. Here, we demonstrate a new technique, applicable when signal background-dominated, reduces requisite exposure time. Our method consists exploiting coherent interference between with designed strongly `amplifier'. A modified angular...