Bulk Ripplocations: New Deformation Micromechanism Discovered

Dislocation theory has been very well established and has been successful in understanding the deformation of metals, but it has never properly explained the ripples and kink bands that are formed when layered materials (e.g. graphite, ice, MAX phases) are deformed. Researches in our MAX/MXene, Computational Materials  Science and Design, and Dynamic Characterization research groups used computational simulations, nanoindentation, and microscopy to find evidence for a new deformation micromechanism to explain the plastic deformation of layered materials like the MAX phases, graphite, and mica. Read more about it in the recent press release by the American Ceramic Society and recent article published in Scientific Reports.

See this video showing a computer simulation of how ripplocations form when graphite is indented.

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Joseph Halim’s successfully defends PhD thesis

Congratulations to Dr. Joseph Halim for a successful PhD defense!

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Dr.Michael Naguib featured in Drexel’s “40 under 40”

Congratulations to Dr.Michael Naguib, former PhD student of the MAX/MXene research group, for being in Drexel Magazine’s 2016 list of “40 under 40” (see below)! Since his PhD research on the discovery of MXenes, a novel family of two-dimensional transition metal carbides/carbonitrides, Dr.Naguib continued to study these materials as Wigner Fellow at Oak Ridge National Lab.

Drexel Magazine’s “40 under 40”: http://drexelmagazine.org/2016/03/2016-forty-under-forty/

 

 

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Engineering Atomic-scale building blocks with MXenes

Two-dimensional materials have been increasingly researched in a effort to discover new compounds and the exotic properties engendered by their sheet-like structure. While the MXenes have already proven to be a family of 2D materials with a rich compositional variability, Dr.Babak Anasori takes surface engineering of the MXenes even further. His research demonstrates the ability to make MXenes with one metal on the surface and another metal in the core of the MXene sheet. This is an invaluable method to control surface chemistry that can be useful to tune electronic, mechanical, and chemical properties for a given application. Watch the video below to learn more!

https://www.youtube.com/watch?v=vmr6fSfPeDc

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Brains or Brawn? Building the Great Pyramids of Egypt

Research by Dr.Michel Barsoum and students turn sheds new light about how the ancient pyramids of Giza were built.  Traditional theories state that the Great Pyramids of Giza were built because of enormous amounts of manual labor to haul large chunks of quarried stone across the desert and up ramps. To many researchers, this theory seems not only beyond imagination but also beyond plausibility. Some researchers have rejected the traditional theory all together and instead postulate that the stones making up the pyramids were cast using an early form of cement known as geopolymer.

However, research by Dr.Michel Barsoum and students suggests both theories are correct to some degree. Read more about these theories, concrete and more in the article featured on Medium.

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MXenes Powering Next Generation Lithium-Sulfur Batteries

Nanolaminated carbon/sulfur materials demonstrate good performance as cathode materials in lithium-sulfur rechargeable batteries. These nanolaminates were synthesized from the MAX phase titanium sulfur carbide by electrochemically etching the titanium atoms. The work was featured in an article by Clean Technica and a recent publication in Angewendte Chemie.

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Conductive MXene “Clay” featured on Nature

Congratulations to PhD student Michael Ghidiu for his work in developing MXene “clays”, which has appeared on the journal Nature titled as “Conductive two-dimensional titanium carbide ‘clay’ with high volumetric capacitance”. This work paves the way for safer processing of MXenes, which have already been demonstrated to have applications as fast and long lasting energy storage devices. The short video below explains how the MXenes are made!

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Michael Naguib Wins the “Outstanding Promise Doctoral Award”

Congratulations to Dr. Michael Naguib! He has been selected to receive an Outstanding Promise Doctoral Award in the area of Mathematical Sciences and Engineering. At every Commencement, three awards are presented to graduating doctoral students who are deemed to exhibit great promise in enhancing Drexel’s reputation in the future. The awards, with a cash prize of $1000 and a certificate of recognition each, are in the following categories: Social Sciences (for students in Business, Education, Information Science, Psychology); Mathematical Sciences and Engineering (for students in Mathematics, all Engineering programs); Physical and Life Sciences (for students in Bioscience, Chemistry, Physics, Environmental Science and Policy, Biomedical Engineering, Nursing and Health Professions, Public Health).

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Babak Anasori wins the “Doctoral Research Excellence Award”

Congratulations to PhD student Babak Anasori! He won the “Doctoral Research Excellence Award”. Graduate Student Excellence Committee selects graduate students who have exhibited outstanding research, scholarship, and/or creativity in the past year.

The 2014 awards were presented at the Drexel Graduate Student Day, held on May 30, 2014.

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Babak Anasori wins the “Teaching Achievement Award”

Congratulations to PhD student Babak Anasori! He won the “Teaching Achievement Award”. Undergraduate students and faculty nominate graduate student TAs for the awards, and recipients are determined by a Teaching Excellence Committee based on the nominations, recommendation letters and recipients’ teaching portfolio.

Babak is the first recipient of the Teaching Achievement Award (as a TA) in Drexel University. Teaching Achievement Award is the final award for a TA who has already won Teaching Excellence award and a Continued Teaching Excellence Award in the previous years.

The 2014 awards were presented at the Drexel Graduate Student Day, held on May 30, 2014.

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