Publications by authors named "D Sheyfer"
Organic phase aggregation and phase splitting are two important (and connected) phenomena in liquid-liquid extraction of metal ions. Previously, we demonstrated how structure in binary mixtures of extractant and diluent originates from concentration fluctuations associated with the so-called "third-phase formation" liquid-liquid phase instability. For more complex systems, we sought to understand how extracted aqueous components affect these concentration fluctuations.
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- The study focuses on the microscopic mechanisms behind the impressive electromechanical properties of relaxor ferroelectrics, specifically looking at polar nanodomains (PNDs) and their organization on different scales.
- Using x-ray coherent nanodiffraction, researchers discovered that PNDs in the material PMN-0.32PT self-assemble into structured patterns called polar laminates, which influence how they respond to electric fields.
- The findings underline the importance of understanding the complex organization of these lattice structures, which can help improve the design of not just relaxors but also other quantum and functional materials.
Adult dental epithelial stem cell-derived organoids deposit hydroxylapatite biomineral.
Int J Oral Sci
December 2023
Article Synopsis
- Ameloblasts are specialized cells that create enamel, a complex tissue made up of elongated hydroxylapatite crystals, but their function is not fully understood due to limitations in current experimental models.
- Researchers have successfully created dental epithelial organoids (DEOs) from adult dental epithelial stem cells, which can maintain important cellular markers and survive for over five months in a controlled environment.
- When DEOs were transplanted into mice, they produced enamel-like crystals, making them a valuable model for studying the mineralization process in dental tissues and advancing knowledge about enamel regeneration therapies.
X-ray-induced piezoresponse during X-ray photon correlation spectroscopy of PbMgNbO.
J Synchrotron Radiat
January 2024
Article Synopsis
- X-ray photon correlation spectroscopy (XPCS) is a technique that can observe atomic-scale dynamics in materials during both stable and changing conditions.
- This study focuses on the relaxor ferroelectric material PbMgNbO (PMN) and shows that a weak AC electric field significantly affects the speckle patterns in diffuse scattering related to polar nanodomains.
- The researchers propose a model to explain the unexpected dynamic tilting of the material in response to the X-ray beam, suggesting that this piezoresponse may be important for interpreting results in XPCS and similar studies of insulating materials.