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Unlocking the Potential of Push-Pull Pyridinic Photobases: Aggregation-Induced Excited-State Proton Transfer.
Chemistry
November 2024
Department of Chemistry, Biology and Biotechnology and CEMIN, University of Perugia, 06123, Perugia, Italy.
The pH effect on the photophysics of three push-pull compounds bearing dimethoxytriphenylamine (TPA-OMe) as electron donor and pyridine as electron acceptor, with different ortho-functionalization (-H, -Br, and -TPA-OMe), is assessed through steady-state and time-resolved spectroscopic techniques in DMSO/water mixed solutions and in water dispersions over a wide pH range. The enhanced intramolecular charge transfer upon protonation of the pyridinic ring leads to the acidochromic (from colorless to yellow) and acido(fluoro)chromic (from cyan to pink) behaviours of the investigated compounds. In dilute DMSO/buffer mixtures these molecules exhibited low pK values (≤3.
View Article and Find Full Text PDFMiddle Meningeal Artery Embolization for Chronic Subdural Hematoma Using N-Butyl Cyanoacrylate With a D5W Push Technique: A Multicentric North American Study of 269 Patients.
Oper Neurosurg (Hagerstown)
September 2024
Department of Neurological Surgery, University of Miami School of Medicine, Miami, Florida, USA.
Article Synopsis
- * A multicenter analysis involved 269 patients, reporting a high success rate (100% effective distal penetration), a low complication rate (2.2%), and significant improvements in cSDH diameter and neurological function at 60-day follow-up.
- * The findings suggest that using MMA embolization with the n-BCA D5W push technique is a safe and viable option alongside or instead of traditional surgery, showing a reduction in recurrence
The Excited-State Lifetime of Poly(NDI2OD-T2) Is Intrinsically Short.
J Phys Chem C Nanomater Interfaces
April 2024
Renewable and Sustainable Energy Institute, University of Colorado Boulder, Boulder, Colorado 80309, United States.
Article Synopsis
- - Conjugated polymers, like poly(NDI2OD-T2) (N2200), are popular in organic solar cells because they absorb near-infrared light well, but they have issues with short excited-state lifetimes and limited photocurrent contribution compared to their paired donors.
- - This study investigates whether the N2200's performance characteristics are due to its polymer structure or external factors by comparing it to model compounds with similar donor-acceptor configurations in a solution.
- - Findings reveal that the model compounds have even shorter excited-state lifetimes than N2200, suggesting that strong electronic interactions and coupling are responsible for the rapid decay to the ground state in both cases.
Motility-induced coexistence of a hot liquid and a cold gas.
Nat Commun
April 2024
Institute of Condensed Matter Physics, Department of Physics, Technical University of Darmstadt, Darmstadt, Germany.
If two phases exist at the same time, such as a gas and a liquid, they have the same temperature. This fundamental law of equilibrium physics is known to apply even to many non-equilibrium systems. However, recently, there has been much attention in the finding that inertial self-propelled particles like Janus colloids in a plasma or microflyers could self-organize into a hot gas-like phase that coexists with a colder liquid-like phase.
View Article and Find Full Text PDFEndoscopic Treatment of Small Bowel Bleeding.
Gastrointest Endosc Clin N Am
April 2024
Division of Gastroenterology and Liver Disease, University Hospitals Cleveland Medical Center/Case Western Reserve University, 11100 Euclid Avenue, Cleveland, OH 44106, USA. Electronic address:
Approximately 5% of all gastrointestinal (GI) bleeding originates from the small bowel. Endoscopic therapy of small bowel bleeding should only be undertaken after consideration of the different options, and the risks, benefits, and alternatives of each option. Endoscopic therapy options for small bowel bleeding are like those treatments used for other forms of bleeding in the upper and lower GI tract.
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