BEGIN:VCALENDAR VERSION:2.0 PRODID:-//jEvents 2.0 for Joomla//EN CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VEVENT UID:5f3c154595692396bf5e9d5d26731d75 CATEGORIES:Seminar CREATED:20230125T115045 SUMMARY:Dr. Christopher Shuck, Drexel University LOCATION:CCB-1209 DESCRIPTION:Synthesis and Kinetics of Intermetallics and New MAX MXene\nWithin solid-st ate chemistry, understanding how a reaction occurs and what affects the rea ction pathway gives insight into controlling reactions to produce materials with specific phases, microstructures, or properties. This is especially t he case with rapid approaches, such as combustion synthesis, where the reac tion is driven by the inherent exothermicity in the system, rather than a p redefined heating pattern. To demonstrate this, I will first focus on the N i/Al reactive system as a model for combustion synthesis kinetics, in addit ion to switching reaction pathways.\nFollowing this, I will discuss a novel class of materials, MXenes. MXenes are potentially the largest class of 2D materials discovered so far. With a general formula of Mn+1XnTx, M is an e arly transition metal (Ti, V, Nb, Ta, etc.), X is C and/or N, Tx represents the surface groups (-O, -OH, -F, -Cl), and n = 1–4, over 30 stoichiometric phases have already been discovered, with many more predicted computationa lly. This class of materials has been widely studied owing to their excepti onal properties, including hydrophilicity, scalability, mechanical strength , thermal stability, redox capability, and ease of processing. Because MXen es inherit their structure from Mn+1AXn (MAX) phase precursors, understand ing MAX phase synthesis leads to control over flake size, defect density, a nd chemical composition of the resultant MXene. One understudied, yet impor tant class of MXenes are solid-solution MXenes, where multiple elements are randomly distributed within the M layers. Herein, a set of multi-M chemist ries (Mo, V, Ti, Nb) are used to study the effect of structure and chemistr y on MXenes. While solid-solution MXenes have unique and tunable chemical, optical, and electronic properties, they also enable the formation of novel MXenes that cannot exist otherwise. By choosing specific chemistries, we c an then begin to understand fundamental aspects of MXene chemistry and stru cture.\n\nHosted by Professor Wilma Olson\n~Coffee/tea will be served prior to the lecture~\n \n X-ALT-DESC;FMTTYPE=text/html:
Synthesis and Kinetics of Intermetallics and New MAX MXe ne
Within solid-state chemistry , understanding how a reaction occurs and what affects the reaction pathway gives insight into controlling reactions to produce materials with specifi c phases, microstructures, or properties. This is especially the case with rapid approaches, such as combustion synthesis, where the reaction is drive n by the inherent exothermicity in the system, rather than a predefined hea ting pattern. To demonstrate this, I will first focus on the Ni/Al reactive system as a model for combustion synthesis kinetics, in addition to switch ing reaction pathways.
Following this, I will discuss a novel class of materials, MXenes. MXenes are potentially th e largest class of 2D materials discovered so far. With a general formula o f Mn+1XnTx, M is an early transition metal (Ti, V, Nb, Ta, etc.), X is C an d/or N, Tx represents the surface groups (-O, -OH, -F, -Cl), and n = 1–4, over 30 stoichiometric phases have already been discovered, w ith many more predicted computationally. This class of materials has been w idely studied owing to their exceptional properties, including hydrophilici ty, scalability, mechanical strength, thermal stability, redox capability, and ease of processing. Because MXenes inherit their structure from Mn+1AXn (MAX) phase precursors, understanding MAX phase synthesis leads to co ntrol over flake size, defect density, and chemical composition of the resu ltant MXene. One understudied, yet important class of MXenes are solid-solu tion MXenes, where multiple elements are randomly distributed within the M layers. Herein, a set of multi-M chemistries (Mo, V, Ti, Nb) are used to st udy the effect of structure and chemistry on MXenes. While solid-solution M Xenes have unique and tunable chemical, optical, and electronic properties, they also enable the formation of novel MXenes that cannot exist otherwise . By choosing specific chemistries, we can then begin to understand fundame ntal aspects of MXene chemistry and structure.
Hosted by Professor Wilma Olson
~Coffee/tea will be served prior to the lecture~
DTSTAMP:20240328T100507 DTSTART:20230202T154000 SEQUENCE:0 TRANSP:OPAQUE END:VEVENT END:VCALENDAR