Institute of High Pressure Physics

21 marca 2024 roku o godz. 12.30 w sali Rady Wydziału na Wydziale Inżynierii Materiałowej PW, ul. Wołoska 141 w Warszawie, odbędzie się publiczna obrona rozprawy doktorskiej mgr inż. Artura Lachowskiego pt.: „Transmission electron microscopy studies of thermal degradation of InGaN/GaN quantum wells”.

Promotorem jest dr hab. inż. Elżbieta Jezierska, prof. uczelni z Wydziału Inżynierii Materiałowej Politechniki Warszawskiej, a promotorem pomocniczym dr hab. inż. Julita Smalc-Koziorowska z Instytutu Wysokich Ciśnień Polskiej Akademii Nauk.

Z dokumentacją związaną z przewodem doktorskim można się zapoznać w serwisie BIP.

The 9^th International Conference on Superconductivity and Magnetism - ICSM2024 will take place in Turkey from April 27^th to May 4^th, 2024. Typically, this international conference gathers over 500 participants, making it a highly esteemed event within the superconducting community. This year dr Shiv J. Singh from our Institute, Laboratory of Superconductors, was invited to organize a session focused on iron-based superconductors. The session "Iron-based superconductors (IBS): Fundamental and applied research under ambient and applied pressures" will be composed of eight talks. More information can be found at https://icsmforever.org/scientific-program/co-organizers-and-confirmed-session-chairs/.

Dr. Singh will also give an invited talk "Enhancement of transition temperature and critical current density of iron-based superconductors by high-pressure growth" at this conference. As demonstrated by dr Singh's current research, high-pressure growth is crucial in improving the superconducting properties of this high Tc superconductor. This talk will cover the optimization of pressure growth conditions, bulk sample quality, superconducting properties, and granular behavior of these families in relation to ambient and high-pressure synthesis processes.

Dr. Singh’s two Ph.D. students, Manasa Manasa, and Mohammad Azam, will also present their work as posters. ICSM2024 conference program  can be found here https://icsmforever.org/scientific-program/wrs/

Hippocrates, the ancient father of medicine, coined the phrase 'let food be thy medicine and medicine be thy food,' which remains highly relevant in today's era of industrialized food. Linseed oil, now recognized for its valuable properties, serves as a beneficial aid in treating wounds and addressing skin cosmetic issues. Its effectiveness extends to conditions like enteritis, peptic ulcer disease, and serves as a preventive measure. Additionally, it exhibits positive impacts on obesity, hypertension, atherosclerosis, and the immune system, thanks to its unique components.

A reserach team from our Institute, NL10 Laboratory (X-PressMatter) in their recent publication [Drozd-Rzoska, A.; Rzoska, S.J.; Łoś, J. https://www.mdpi.com/2673-4125/4/1/3#mce_temp_url#. Biophysica 4, 34–58 (2024)], reveals that linseed oil's exceptional properties may be attributed to supercriticality, a feature previously overlooked. The report presents evidence of a strong and long-range supercritical effect on the dielectric constant, opening up new possibilities for applications based on precise modeling and enhancing its beneficial features.

The supercritical domain in linseed oil manifests in the liquid phase, coupled with a liquid-solid phase transition. Changes in the liquid phase resemble the isotropic phase of liquid crystals, characterized by a weakly discontinuous liquid-solid phase transition - a phenomenon unprecedented for such transitions. The report also highlights a pre-transitional effect in the solid phase, resembling 'premelting,' indicative of 'constrained criticality' leading to local areas of negative pressures and alterations in the dielectric constant of the Mossotti catastrophe type.

Often overlooked in fundamental considerations, natural systems like linseed oil, as demonstrated in this study, can serve as excellent models for understanding previously unknown phenomena.

Figure: Changes of a dielectric constant in Linseed Oil - supercritical  (liquid, red curve) and premelting (solid, blue curve). Arrows show the melting temperature and the sequence of liquid-liquid (L-L) and solid-solid (S-S) transitions.

Jutro (4 stycznia 2024) o 9:15 na żywo w Polskim Radiu Trójka Mikołaj Żak z naszego Instytutu (Laboratorium MBE) przedstawi nowe spojrzenie na diody LED, które mogą wydajnie działać przy zasilaniu prądem przemiennym. Będzie to komentarz do niedawno opublikowanej pracy w Nature Communications, o której pisze dzisiaj portal naukawpolsce.pl. Zapraszamy do zajrzenia na stronę portalu i słuchania audycji.

Rys. Wizualizacja działania dwukierunkowej diody. Autor: Mateusz Hajdel (IWC PAN) współautor artykułu.

(Edit) O wynalazku i publikacji Mikołaja Żaka i współautorów w Nature Communications pisze tez portal focus.pl