Kelly A Dobos MS, MBA’s Post

A perfect gift to begin the faculty position. Work led by Qinghao and me at the University of Waterloo out in Chemistry of Materials, an American Chemical Society frontrunner journal. We show how defect-carrier interactions compete with dopant-carrier interactions to govern exciton polarization in metal oxide NCs. In II-VI semiconductors, the intrinsic (defect) contribution to the exciton polarization is negligible compared to the strong sp-d interactions of transition metal dopants with the exciton. Even one dopant is enough to overcome the intrinsic effects. We show that in metal oxide NCs, the intrinsic contribution is not just significant but comparable to the sp-d exchange interactions imparted by transition metal dopants and as many as 12-15 dopants would be required to overcome the intrinsic effects. We also show that the size of the NCs strongly governs this dependence but is independent of the position of the dopant. WE ESSENTIALLY RATIONALIZE WHY IT IS SO DIFFICULT TO ACHIEVE RT FERROMAGNETISM IN DOPED METAL OXIDES CONSISTENTLY. https://lnkd.in/ge2DMGw6 My new research group will invest heavily in understanding magnetoplasmonics and exciton polarization dynamics of doped metal oxide NCs. Can't wait to get started on exploring more of this!! #NewPI #ACS #ChemMater #UniversityOfWaterloo

☀🔬To improve the efficiency of printed #perovskite #SolarCells, our researchers used #microscopy to more easily identify and target infiltration defects. Infiltration, the extent to which the perovskite fills the porous structure of the cell, is critical for optimum performance and stability. Using a microscope is a simple, nondestructive technique that could enable targeted performance enhancement and quality control in future scale-up initiatives. Read the paper here: https://lnkd.in/ekanYrmX 👏Congrats to the authors: Carys Worsley, Tom Dunlop, Sarah-Jane Potts, Rodrigo García Rodríguez, Dr Becky Bolton, Matthew Davies, eifion jewell, Trystan Watson

I'm excited to announce our recent publication, titled **"Fabrication of a High-Performance Memristor Device by Metallization of Ag⁺ inside a Solution-Processed Li₅AlO₄ Thin Film"**, where I contributed as the 2nd author, in the prestigious **RSC Journal of Materials Chemistry C**. In this work, we developed and patented a novel approach to achieve resistive switching in oxide memristor devices, demonstrating an impressive high HRS/LRS ratio, excellent endurance cycles, and memory retention of up to 12 hours, which when projected will retain up to 30 days. This research opens new possibilities for the future of memory storage devices, with potential applications in neuromorphic computing. I would like to extend my congratulations to Subarna Pramanik, the lead author, and to all our collaborators. Their invaluable support and insights were crucial to the success of this paper. If you are interested in details, feel free to check out the paper here: https://lnkd.in/g2DEZvZp #Research #Memory #Memristor #STEM #Nanoelectronics #ResistiveSwitching

I am thrilled to share that our new article, “Exploring the Impact of Ring Mobility on the Macroscopic Properties of Doubly Threaded Slide-Ring Gel Networks”, has been published in Angewandte Chemie (Wiley open access!). In this study, we introduce a novel approach to designing doubly threaded slide-ring gels (dt-SRGs) using metal-templated rotaxane crosslinkers. By copolymerizing these crosslinkers with PEG-acrylate monomers, we successfully fabricated dt-SRGs with tunable mechanical properties. What's particularly interesting is how the ring mobility enhances the material’s swelling, stress-relaxation, and viscoelastic properties. We also explored how adjusting the ring size impacts these properties, offering a versatile platform for designing gel networks with tailored characteristics. This research provides new insights into mechanically interlocked polymer architectures. We are delighted that this paper has been classified as a “Very Important Paper” by Angewandte Chemie International Edition. This work was my first research project on mechanically interlocked polymers during my postdoc. Huge thanks to my postdoc advisor, Prof. Stuart Rowan, and collaborators, Guancen Mike Liu, Hojin Kim, Jerald Hertzog, Ph.D, Natsumi Nitta Ono !!

Our new paper on the impact of imperfections in crystals on the determination of 3D structure is now available open access in the most recent volume of Annual Review of Physical Chemistry. We discuss various ways imperfections affect crystallography. https://lnkd.in/g2JW5hUf

I'm delighted to share a recent article from Current Opinion in Solid State and Materials Science focusing on one of the main themes the journal publishes in: Structural Materials and Additive Manufacturing.   "Defects and anomalies in powder bed fusion metal additive manufacturing". Read the full article ➡ https://lnkd.in/gxwF_zfv   💡This review describes common defects and anomalies and their formation mechanisms in powder bed fusion additive manufacturing processes, and strategies to mitigate these defects.   Kudos to the authors!🔬👏 Amir Mostafaei, Cang Zhao, Yining He, Seyed Reza Ghiaasiaan, Bo Shi, Shuai Shao, Nima Shamsaei, Ziheng Wu, Nadia Kouraytem, Tao Sun, Joseph Pauza, Jerard V. Gordon, Bryan Webler, Niranjan D. Parab, Mohammadreza Asherloo, Qilin Guo, Lianyi Chen, Anthony D. Rollett   Current Opinion in Solid State & Materials Science aims to provide a snapshot of the latest research and advances in materials science such as developments in Structural Materials, Energy Materials, Biological & Soft Materials, and Electronic & Functional Materials.

My new paper is published! We were able to use time-resolved measurements of light emitted from silica defects to track electrons that transferred through four different steps in a charge-transfer chain mimicking an artificial photosynthesis device. So many cool aspects that make me proud—a rare case of oxygen enhancing luminescence, a 3-D printed gas cell that mounted our sample pellets in exactly the same position every time, and all of this data taken by undergraduate researchers!

I'm thrilled to announce that our latest research has been published in the International Journal of Solids and Structures! 📄🔬 Title: A novel in-situ micro-mechanical testing of paper fracture and its stochastic network model Read the full article here: https://lnkd.in/d_fc6_dD In this study, we investigated the fracture mechanics of cellulose-based paper materials, which are crucial for eco-sustainable packaging solutions. Through a combination of in-situ tensile tests and confocal microscopy using the facilities available at the MUSAM lab at Scuola IMT Alti Studi Lucca, we analyzed the microstructural mechanisms that influence paper fracture. Our developed stochastic network model accurately predicts the anisotropic properties of paper materials and provides new insights into the mechanical behavior of paper. A huge thank you to the authors, specifically to my supervisor, Professor Marco Paggi, for his invaluable coaching and guidance, and to my colleague, Hamed Zarei, for his significant contributions to this work. This achievement would not have been possible without your support. #Research #SustainablePackaging #MaterialScience #PaperMechanics #Micromechanics #StatisticalModeling

🎉 Excited to share our latest paper 🎉 Our new article with my student @Alperen Bardakçı on the crashworthiness performance in thin-walled multi-cell tubes 3D-printed from different polymers is now available online in the Journal of Applied Polymer Science. (Published by Wiley, Q2). #newpaper #crashworthiness #3dprinting #PLA #multicelltubes #thinwalledtubes

🚀#mdpisymmetry #featurepaper Excited to share a Feature Paper with you. "Fluctuating Flexoelectric Membranes in Asymmetric Viscoelastic Media: Power Spectrum through Mechanical Network and Transfer Function Models" 🔸https://lnkd.in/gAVW69dD 🔹Authors: Edtson Emilio Herrera-Valencia and Alejandro D. Rey Universidad Nacional Autónoma de México McGill University 🔸Abstract: Flexoelectric liquid crystalline membranes immersed in asymmetric viscoelastic media is a material system model with physiological applications such as outer hair cells (OHCs), where membrane oscillations generate bulk flow. Motivated by this physiological process, here we extend our previous work by characterizing the force transmission output of our model in addition to viscoelastic fluid flow, since solid–fluid interactions are an essential feature of confined physiological flow and flow in immersed elastic structures... #viscoelastic #fluidflow Chemistry and Symmetry/Asymmetry Section