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Origins of complexity in the rheology of Soft Earth suspensions.
Nat Commun
August 2024
Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA, 19104, USA.
When wet soil becomes fully saturated by intense rainfall, or is shaken by an earthquake, it may fluidize catastrophically. Sand-rich slurries are treated as granular suspensions, where the failure is related to an unjamming transition, and friction is controlled by particle concentration and pore pressure. Mud flows are modeled as gels, where yielding and shear-thinning behaviors arise from inter-particle attraction and clustering.
View Article and Find Full Text PDFA microfluidic model for infantile in vitro digestions: Characterization of lactoferrin digestion.
SLAS Technol
October 2024
University of Groningen, Groningen Research Institute of Pharmacy, Pharmaceutical Analysis (XB20), Antonius Deusinglaan 1, 9713 AV Groningen, the Netherlands. Electronic address:
We present a miniaturized, flow-through model for infantile in vitro digestions, following up on our previously published in vitro digestive system for adults. Microfluidic 'chaotic' mixers were employed as microreactors to help emulate the biochemical processing going on in the infantile stomach and intestine. Simulated digestive fluids were introduced into these micromixers, and the mixtures were incubated for 60 min after both the gastric phase and the intestinal phase.
View Article and Find Full Text PDFImpact of a Lightly Branched Star Polyelectrolyte Architecture on Polyelectrolyte Complexes.
ACS Macro Lett
June 2024
Pritzker School of Molecular Engineering, The University of Chicago, Chicago, Illinois 60637, United States.
Article Synopsis
- Increased charge density in polyelectrolytes enhances salt resistance and mechanical properties of polyelectrolyte complexes (PECs) across different polymer types.
- Researchers demonstrated that switching from linear to lightly branched polymer architectures allows for independent adjustment of salt resistance while keeping other characteristics constant.
- The study suggests that while linear charge density affects the interactions within PECs, spatial charge density influences the stability of these complexes, paving the way for advanced material design in applications involving polyelectrolyte complexes.
Thermoswitchable catalysis to inhibit and promote plastic flow in vitrimers.
Chem Sci
May 2024
Polymer Chemistry Research Group, Centre of Macromolecular Chemistry (CMaC) and Laboratory of Organic Synthesis, Departement of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University Krijgslaan 281-S4 Ghent 9000 Belgium
Acid-base catalysis is a common strategy to induce covalent bond exchanges in dynamic polymer networks. Strong acids or strong bases can promote rapid network rearrangements, and are simultaneously preferred catalysts for chemical reactions where maximum efficiency at the lowest possible temperature is aimed for. However, within the context of dynamic polymer networks, the incorporation of highly active catalysts can negatively affect the longer term application potential.
View Article and Find Full Text PDFA Novel Artificial Coronary Plaque to Model Coronary Heart Disease.
Biomimetics (Basel)
March 2024
Department of Cardiothoracic, Transplantation and Vascular Surgery, Hannover Medical School, 30559 Hannover, Germany.
Background: Experimental coronary artery interventions are currently being performed on non-diseased blood vessels in healthy animals. To provide a more realistic pathoanatomical scenario for investigations on novel interventional and surgical therapies, we aimed to fabricate a stenotic lesion, mimicking the morphology and structure of a human atherosclerotic plaque.
Methods: In an interdisciplinary setting, we engineered a casting mold to create an atherosclerotic plaque with the dimensions to fit in a porcine coronary artery.
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