Prof. Dr. Slavko Bernik and Doc. Dr. Matejka Podlogar, in collaboration with researchers from the Shanghai Institute of Ceramics, Chinese Academy of Science, published an article in the journal ACS Applied Materials & Interfaces (IF 9.229) in which they report on a novel type of sustainable ZnO-based varistor ceramic that is based on Cr2O3 as varistor former and oxides of Ca, Co and Sb as the performance enhancers. The varistor ceramics ZnO-Cr2O3 are distinguished by an ultrahigh coefficient of nonlinearity a, a wide range of breakdown voltage EB and a very low leakage current IL. Compared to previously known ZnO-based varistor ceramics, the novel ceramics do not contain highly volatile Bi2O3, expensive rare earth elements (Pr6O11) or toxic V2O5, and the microstructure is practically single-phase. The formation mechanism of electrostatic Schottky barriers at the grain boundaries of ZnO with the addition of Cr2O3, which are the reason for the varistor…
The Jožef Stefan Institute is opening its doors on the 27th of March, this year online. You are invited to enter the world of nanomaterials starting with an English presentation at 11 am. The program schedule can be found at the link: DAN ODPRTIH VRAT 2021 NA INSTITUTU “JOŽEF STEFAN” – LETOS NA DALJAVO | Center za prenos tehnologij in inovacij na Institutu “Jožef Stefan” (ijs.si) You can find and visit our department under the title: Higgs boson to the greatest challenges of modern society. Here you will get to know research from three different sections (F9-Experimental Particle Physics Department, K7-Department for Nanostructured Materials, B1-Departments of Biochemistry and Molecular Biology). A link to the login: Prijava za Dan odprtih vrat 27. 3. 2021 na Institutu “Jožef Stefan” (google.com) Kindly invited.
Slovenska znanstvena fundacija (SZF), in collaboration with the World Federation of Scientists (WFS), granted ten national scholarships to Slovene doctoral students and young doctors conducting research related to Planetary Emergencies. The World Laboratory program brings together young creative people responding to the challenges of the modern world. One of the scholarship recipients is Dr. Tomaž Tomše. Under the supervision of Professor Sašo Šturm, Tomaž will develop a new approach towards the manufacture of advanced multicomponent Nd-Fe-B permanent magnets for electromotors and generators. Congratulations!
Interviews of Prof. Dr. Spomenka Kobe and Prof. Dr. Jean-Marie Dubois during the annual meeting »2019 Sustainable Industrial Processing Summit and Exhibition”, the world’s biggest sustainability conference. Prof Dr. Kobe was one of the awardees. https://youtu.be/FWvioYNszMs https://youtu.be/g9xHuiYvQi8
New publication: Triggering the Aqueous Interparticle Association of γ‒Al2O3 Hierarchical Assemblies Using Divalent Cations and Cellulose Nanofibers. We successfully prepared stable aqueous suspensions, containing hierarchically assembled, mesoporous γ‒Al2O3 particles with high surface area. Addition of divalent cations such as Mg2+ or Ca2+ or cellulose nanofibers triggered a formation of various interparticle associations, which hindered or even prevented sedimentation. Preparation of such suspensions is especially important for preparation of advanced, porous ceramic materials relevant in catalysis and adsorption. The work was published in the leading scientific publication dealing with ceramic materials Journal of the European Ceramic Society.
Andraž Kocjan was involved in an interdisciplinary research directed by Sašo Gyergyek and Darko Makovec from the Department for Materials Synthesis and from the Department of Nanostructured Materials in a collaboration with researchers from the Department of Catalysis and Reaction Engineering of the National Institute of Chemistry. The work was published in the renowned scientific journal Green Chemistry, entitled Hierarchical Ru-bearing Alumina/Magnetic Iron-Oxide Composite for the Magnetically Heated Hydrogenation of Furfural. The paper demonstrates application of magnetic heating of nanoparticles in AC-field to drive chemical reaction. The authors showed that conversion of furfural to furfuryl alcohol over the catalyst in the same time interval reached 95% when “targeted” heating by AC magnetic field was used, but only 63% when conventional heating was applied. They were the first to show that a well-designed hierarchical composite (UK patent) can simultaneously serve as a catalyst and heat source to drive a technologically important…
Prof. dr. Sašo Šturm, Head of Department for Nanostructured Materials, was elected as a member in Executive Board of European Microscopy Society (EMS). The EMS is an umbrella organization that brings together all national microscopy societies. Prof. dr. Sašo Šturm was proposed by the Slovene Society for Microscopy (SDM) Executive Board and thus the Slovenian representative in the EMS Executive Board was elected for the first time.
“Evropska komisija je v začetku leta predstavila zaleni dogovor- krovni dokument prehoda na trajnostno in pametno mobilnost. Pri tem bosta ključni elektrifikacija prometnega sistema in zelena energija, ki sta že deležni velikih vlaganj in raziskav na svetovni ravni, pomembno vlogo na tem področju pa imajo trajni magneti. Ti so ključni pri delovanju električnih motorjev z velikim izkoristkom v e-vozilih in vetrnih elektrarnah. Narejeni so na osnovi kovin redkih zemelj, ki so na seznamu najbolj kritičnih surovin, Evropa pa jih mora skoraj v celoti uvažati. Sodelavci Odseka za nanostrukturne materiale na IJS dr. Kristina Žužek Rožman, dr. Benjamin Podmiljšak, dr. Spomenka Kobe, dr. Tomaž Tomše in dr. Sašo Šturm si prizadevajo za celostno obravnavo kritičnih elementov tako z vidika nizke odpadkovne tolerance kot vzporedne neodvisnosti posameznih držav glede njihovega zagotavljanja”. (Delo, julij 2020) zemlje_Žužek Rožman_julij 2020
The EU-funded AMPHIBIAN project, in which a partner was also Department for Nanostructured Materials JSI, successfully developed a patented flywheel – a mechanical device designed to efficiently store energy – as well as permanent magnetic material produced without rare-earth minerals.
Editorial Board from a prominent journal Green Chemistry and has selected a paper by XU, Xuan, ŠTURM, Sašo, SAMARDŽIJA, Zoran, ŠČANČAR, Janez, MARKOVIĆ, Katarina, ŽUŽEK ROŽMAN, Kristina, all from Jozef Stefan Institute entitled »A facile method for the simultaneous recovery of the rare-earth elements and transition metals from Nd-Fe-B magnets, DOI: 10.1039/C9GC03325D« as a 2020 HOT Green Chemistry article. The collection is assessable here. The paper is a result of ITN-MSCA project DEMETER, Training Network for the Design and Recycling of Rare‐Earth Permanent Magnet Motors and Generators and Full Hybrid and Electric Vehicles [2015-2019] for which funding is gratefully acknowledged. The paper by, Xuan Xu proposes new findings and concepts about recycling of Nd-Fe-B permanent magnets, which are considered as the most valuable secondary recourse for rare – earths, that represent a novelty in the field of recourse efficiency and critical raw materials conservations. The paper has set new directions in the…
After receiving the Krka Prize in 2019, for the study entitled “Coloidal silver in dental products”, students Laura Drasler and Ula Dragman, from the Vič High School, under the mentorship of prof. Alenke Mozer (Gim. Vič) and Anje Korent (IJS, K7), submitted the research paper for the GENIUS Olympiad 2020 competition. The submitted research paper has made it to the finals of the GENIUS Olympiad 2020. The research focuses on the study of the colloidal silver concentration in dental products such as toothpaste, mouthwash and toothbrush. Commercial products with silver content were purchased and studied by students on K7, IJS laboratories. https://geniusolympiad.org/index.html
Research article: A spark-plasma-sintering approach to the manufacture of anisotropic Nd-Fe-B permanent magnets. The research article addresses issues associated with the production of Nd-Fe-B permanent magnets. The shape of the magnet is limited to simple geometrical forms when the conventional sintering techniques are applied. This approach limits the desing freedom of electrical motors and generators and hinders the development of advanced energy-conversion technologies. The authors proposed a contemporary sintering technique, based on fast consolidation of a powder compact by means of electrical current, as an alternative solution for the manufacture of complex-shaped magnets. https://www.sciencedirect.com/science/article/pii/S0304885319335887
Liquid-Cell Transmission Electron Microscopy (LCTEM) is a method for studying the nucleation and growth of nanostructures either from solutions or during the electrodeposition, at the nanoscale and in real time. In the joint study between the researchers at the Department for Nanostructured Materials at Jožef Stefan Institute and National Institute of Chemistry we have shown that the radical-induced redox chemistry can be used to investigate various redox-driven dynamics for a wide range of functional nanomaterials, in situ, and under dynamic conditions by applying LCTEM. We successfully modelled radical-induced redox chemistry processes in LCTEM, including the complex kinetics of the radiolysis species and their influence on the redox chemistry of the materials under investigation. The results of this study were published in a highly ranked journal Chemical Science (IF = 9,5).
Dr. Kristina Žagar Soderžnik, from the Department of Nanostructured Materials, appeared in the science-educational-documentary movie, Fire of Science (Ogenj znanosti). In the movie, in addition to prof. dr. Jadran Lenarčič, Director of the JSI and prof. dr. Igor Muševič, Head of the Department of Solid State Physics, answers questions about why society needs science, what is its significance and whether science is a privilege. The science-education movie was made as part of the 70th anniversary of the Jozef Stefan Institute. https://4d.rtvslo.si/arhiv/dokumentarni-filmi-in-oddaje-izobrazevalni-program/174661968
Prof. Dr. Spomenka Kobe is the recipient of the prestigious »Frey Award for Leadership in development new technologies that contribute to global sustainable development in the environment, economy, and social points of view.” The summit honored the 2019 STARS of sustainable science, technology, and innovation and was divided into ten parallel Symposia devoted to the awardees. One of them was the “Kobe International Symposium on Science of Innovative and Sustainable Alloys and Magnets (SISAM),” where the world-leading scientists from the field of magnets and complex alloys presented the latest achievements in the field. Frey Award is granted to scientists, economists, and politicians. So far, the only awarded Slovene was a commissioner for science and later for environment Dr. Janez Potočnik. https://www.ijs.si/ijsw/IJS
Sustainable Industrial Processing Summit (SIPS 2019) took place in Cyprus from 23th to 26th of October 2019. Dr. Nina Kostevšek from the Department of nanostructured materials was awarded the Wüthrich International Young Star Award for the outstanding performances during the early career stages. This award has been established in honour of the distinguished work and lifetime achievements of 2002 Nobel Laureate in Chemistry, Prof. Kurt Wüthrich, who is known for developing the NMR method for studying macrobiological molecules. Dr. Nina Kostevšek presented work on the development of new nanoparticle-based contrast agents for magnetic resonance imaging.
27th International Conference on Materials and Technology (27 ICM&T) took place in Portorož from 16th to 18th October 2019. In scope of the conference Young researchers competition was organized. The international committee awarded Hermina Hudelja from K7 with excellent second place for the talk entiteled: “Feather-light, cellulose-nanofiber-reinforced γ˗Al2O3 foams”.
Research article: Multicomponent permanent magnets for enhanced electrical device efficiency. We presented an innovative approach for improving the efficiency of permanent magnets which consequently improve the efficieny of electro-mechanical devices, such as electric motors and wind turbines. The research is based on results of simulations that predicted the benefits of using magnets containing regions with different magnetic properties. The proposed approach allows us to minimize the use of expensive and critical heavy-rare-earth elements dysprosium and terbium. https://www.sciencedirect.com/science/article/pii/S0304885319308170
On September 16, 2019, the fourth Scientific Slam took place at the ZRC Atrium. This year’s slam was held as part of the Cutting Edge 2019 conference. In my 5 minute presentation, I presented the fusion and fusion relevant materials, that we are developing at JSI. Znanstveni slam 2019 – Cutting Edge
How to make zirconia based composites electroconductive and thus suitable for Electrical Discharge Machining? You can read about it now in an open access scientific journal Materials. Our coworkers Ana Lazar, Tomaž Kosmač, Janez Zavašnik, Anže Abram and Andraž Kocjan reported on advanced fabrication route of zirconia based nanocomposites resulted in enhanced mechanical and electrical properties enabling cost efficient machining at low contents of reinforcing phase. https://www.mdpi.com/1996-1944/12/17/2789/htm
At the 6th European Conference on Environmental Applications of Advanced Oxidation Processes which was held during 26th and 30th June 2019 in Portorož-Portorose, Živa Marinko successfully presented poster with the title – Connecting Metal Titanium Surface Properties and TiO2 Nanotube Photocatalytic Activity: Top-Down Approach and was therefore given a diploma for the 3rd place at the Student Paper Contest and awarded an Environmental Science: Water Research & Technology Poster Prize.