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A Possible Path to Polypeptides on Prebiotic Earth

The Center for Chemical Evolution’s recent article in Angewandte Chemie, “Ester-Mediated Amide Bond Formation Driven by Wet–Dry Cycles: A Possible Path to Polypeptides on the Prebiotic Earth,” has garnered a lot of press lately.

Boggs Upper-level Chemistry and Biochemistry Labs Renovated

Form follows function and so the Gilbert Hillhouse Boggs building second floor—originally housing research labs and now home to upper-level chemistry and biochemistry teaching labs—has been renovated (pictures, courtesy of HKS, Inc., below).

Professor Mostafa El-Sayed Wins 2016 Priestley Medal

The American Chemical Society, the world’s largest scientific society, has announced Georgia Tech Professor Mostafa El-Sayed as the winner of its highest honor, the 2016 Priestley Medal for distinguished service in the field of Chemistry.

2015 REU Program Commences with Annual Retreat

Welcome to the 2015 REU students who arrived on campus this week to participate in the 10 week program.

Bonjour….Chemistry in Lyon, France 2015

Thirty-six Georgia Tech undergraduates are currently participating in an 8-week GT faculty-led study abroad program in Lyon, France.

Seminars & Events

Meeting - Thursday, August 13, 2015 - 11:00am - MoSE 2100F
Social Event - Friday, August 14, 2015 - 3:00pm - 2nd Floor Atrium
Meeting - Tuesday, August 18, 2015 - 11:00am - MoSE 3201A
Social Event - Thursday, August 20, 2015 - 10:00am - 2nd Floor Boggs

Featured Research

Article Title
Research Authors
Justin C. Hancock, Karena W. Chapman, Gregory J. Halder, Cody R. Morelock, Benjamin S. Karlan, Leighanne C. Gallington, Angelo Bongiorno, Chu Han, Si Zhou, Angus P. Wilkinson.
Citation
Chemistry of Materials (2015), Vol. 21(11), 3912-3918
Miscellaneous Details
Georgia Institute of Technology including a President’s Undergraduate Research Award. Experiments performed at the Advanced Photon Source and ORNL's Spallation Neutron Source, both are U.S. Department of Energy (DOE) Office of Science User Facilities.

CaZrF6 and CaHfF6 display much stronger negative thermal expansion (NTE) than ZrW2O8 and other corner-shared framework structures. Their NTE is comparable to that reported for framework solids containing multiatom bridges, such as metal cyanides and metal-organic frameworks. However, they are formable as ceramics, transparent over a wide wavelength range and can be handled in air; these characteristics can be beneficial for applications. The NTE of CaZrF6 is strongly temperature-dependent, and first-principles calculations show that it is largely driven by vibrational modes below 150 cm-1. CaZrF6 is elastically soft with a bulk modulus at 300 K of 37 GPa and, upon compression, starts to disorder at approximately 400 MPa. The strong NTE of CaZrF6, which remains cubic to <10 K, contrasts with cubic CoZrF6, which only displays modest NTE above its rhombohedral to cubic phase transition at close to 270 K. CaZrF6 and CaHfF6 belong to a large and compositionally diverse family of materials, AIIBIVF6, providing for a detailed exploration of the chemical and structural factors controlling NTE and many opportunities for the design of controlled thermal expansion materials.

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