OCTOBER 15, 2019

Yuriy Román-Leshkov

Associate Professor of Chemical Engineering
MIT - Massachusetts Institute of Technology

BIO: Prof. Román’s research lies at the interface of heterogeneous catalysis and materials design. His group applies a wide range of synthetic, spectroscopic, and reaction engineering tools to study the chemical transformation of molecules on catalytic surfaces. A strong emphasis is placed on the application of catalytic materials to tackle relevant problems associated with sustainable energy, biofuels, and renewable chemicals. Current efforts are geared toward designing water-tolerant solid Lewis acids, investigating cooperative effects in porous materials for C-O and C-H bond activation, and engineering transition metal carbides and nitrides as replacements for critical materials. He has been awarded the SHPE Outstanding Young Investigator, the NSF CAREER, Aris, AICHE CRE Young Investigator, and ACS Early Career in Catalysis awards.

TITLE: Molecular engineering of catalytic interfaces: Towards improved stability for earth-abundant catalysts

ABSTRACT: In an increasingly carbon-constrained world, lignocellulosic biomass, natural gas, water, and carbon dioxide have emerged as attractive options to supply energy, fuels, and chemicals at scale in a cleaner and more sustainable manner. However, the unique chemical makeup of these alternative energy sources has created daunting conversion challenges, requiring the development a new generation of catalysts to promote selective bond-breaking events. In this lecture, I will show how advanced synthesis techniques can be coupled with rigorous reactivity and characterization studies to unearth unique synergies in nanostructured catalysts. More specifically, I will discuss the use of molecular engineering tools to design nanostructured earth-abundant heterometallic early transition metal carbide (TMC) nanoparticles as a novel platform to replace (or at least drastically reduce) noble metal utilization in electro- and thermo-catalytic applications. I will present a new method to synthesize TMCs covered in atomically-thin layers of noble metals with exquisite control over composition, size, crystal phase, and purity. Controlling these features has direct consequences on the electronic (and thus catalytic) properties of the noble metal overlayer. The advantages of this new class of materials will be demonstrated in the context of CO-tolerant electro-oxidation reactions and selective partial hydrogenation of hydrocarbons (Figure 1). By gaining a fundamental understanding of the parameters governing the behavior of these interfaces, we can then derive and implement design principles aimed at improving their stability and long-term performance.

Lydia Contreras
Associate Professor of Chemical Engineering 
University of Texas-Austin

BIO: Prof. Contreras is a member of the Institute of Cell and Molecular Biology at the University of Texas-Austin. She teaches Thermodynamics, Introduction to Chemical Engineering Analysis, and Fundamental and Applications of Cellular Regulation. Dr. Contreras obtained a B.S.E. in Chemical Engineering from Princeton University, where she graduated Cum Laude. She completed her PhD in Chemical Engineering from Cornell University, focusing on engineering bacterial cells for improved production of therapeutic proteins. As a postdoctoral associate at the Wadsworth Center (New York State Department of Health), she focused on understanding mechanisms of infection in pathogenic bacteria. She began her career at the University of Texas-Austin in 2011, where she leads a research team focused on RNA biochemistry to study gene regulation mechanisms associated with stress-responses for applications in health and biotechnology. She has received several academic, teaching and service awards including: Department of Thrust Reduction Agency (DTRA) Young Investigator, Airforce Office of Scientific Research Young Investigator, NSF CAREER, Health and Environmental Institute (HEI) Walter E. Rosenblith New Investigator, Norman Hackerman Advanced Research Program (NHARP) Early Career, Society of Hispanic Professional Engineers (SHPE) Young Investigator Award, and an Innovative Early-Career Frontiers of Engineering Educator.

TITLE: Understanding and Engineering RNAs for Programmable Gene Control

ABSTRACT: Regulatory RNAs enable bacteria to dynamically respond to stresses caused by changes in environmental conditions. Specifically, bacterial small RNAs, a class of RNA regulators, exert dynamic control on complex networks by regulating gene expression. Understanding their functions is a goal in both medicine and metabolic engineering given their relevance to pathogenesis and their potential to manage global regulatory networks that affect biological production of industrially-relevant compounds. Given the importance of molecular structure to RNA functioning, fundamental sRNA characterization and applied engineering efforts  depend heavily on the understanding and design of their specific shapes. Specifically, knowledge of the RNA structural landscape supports identification of interfaces relevant to regulation. In this talk, we will describe the development of a high throughput tool that allows for the simultaneous in vivo characterization of thousands of potential interacting interfaces in RNA molecules, as determined based on their molecular accessibility. We will describe how RNA structural insights obtained from this synthetic probing approach can be used in the functional characterization of newly discovered RNAs and in the rational design of bacterial sRNAs to achieve a tunable gradient of global control for metabolic engineering applications.

V. Faye McNeill
Associate Professor of Chemical Engineering
Columbia University

BIO: Prof. McNeill is the Chair of the Undergraduate Committee Columbia University. She joined Columbia in 2007 and received tenure in 2014. She received her B.S. in Ch.E. from Caltech in 1999 and her PhD in Ch.E. from MIT in 2005, where she was a NASA Earth System Science Fellow. From 2005-2007 she was a postdoctoral scholar at the University of Washington Department of Atmospheric Sciences. She received the NSF CAREER and the ACS Petroleum Research Fund Doctoral New Investigator awards in 2009. She was the recipient of the Kenneth T. Whitby Award of AAAR in 2015. She is the Associate Editor in charge of Atmospheric Chemistry for ACS Earth and Space Chemistry. She was a co-editor of Atmospheric Chemistry and Physics from 2007-2017. She has served in multiple elected officer positions in AIChE, AAAR, and AGU. She is an appointed member of the IUPAC panel on kinetic data evaluation and the ACS Committee on Environmental Improvement.

TITLE: Aqueous Atmospheric Chemistry: From the Molecular to the Regional and Global Scales

ABSTRACT: Aqueous chemical processes occurring in cloud droplets and wet atmospheric particles are an important source of organic and inorganic atmospheric particulate matter. Despite considerable progress, mechanistic understanding of some key aqueous processes is still lacking, and representation of these processes is incomplete in most regional and global models. I will review the state of the science and discuss my group’s efforts in characterizing these processes in the laboratory, modeling them in detail on the molecular level, and model reduction to include essential processes in large-scale models.

Jeffrey Rimer
Associate Professor of Chemical Engineering
University of Houston
 

BIO: Prof. Rimer received B.S. degrees in Chemical Engineering and Chemistry from Washington University in St. Louis and Allegheny College, respectively. In 2006, he received his Ph.D. in Chemical Engineering from the University of Delaware. Prior to joining the Department of Chemical and Biomolecular Engineering at Houston in 2009, he spent two years as a postdoctoral fellow at New York University’s Molecular Design Institute within the Department of Chemistry. Jeff’s research in the area of crystal engineering focuses on the rational design of materials with specific applications in the synthesis of microporous catalysts and adsorbents, and the development of therapeutics to inhibit crystal formation in pathological diseases. His work has been featured in high impact journals such as Science and Nature, among others. Jeff has also received numerous awards, including a Welch Foundation fellowship, the ACS Doctoral New Investigator Award, and the NSF CAREER Award. Recently, he was selected for the 2016 Owens Corning Early Career Award by AIChE. He has also been the recipient of several research and teaching awards, including the Junior Faculty Research Excellence Award from the Cullen College of Engineering, the Excellence in Research and Scholarship and the Early Faculty Award for Mentoring Undergraduate Research from the University of Houston, and Teaching Excellence Awards at both the University and College level. Jeff serves as chair of the Southwest Catalysis Society, vice chair of the International Zeolite Association Synthesis Commission, chair elect for the Gordon Research Conference on Crystal Growth and Assembly, and he is an advisory board member for the journal Reaction Chemistry & Engineering.

TITLE: Identifying New Paradigms in Crystal Engineering for Energy and Biomedical Applications

ABSTRACT: Crystal engineering is a broad area of research that focuses on methods of designing and/or optimizing materials for diverse applications in fields spanning from energy to medicine. The ability to selectively control crystallization to achieve desired material properties requires detailed understandings of the thermodynamic and kinetic factors regulating crystal nucleation and growth. Combining this fundamental knowledge with innovative approaches to tailor crystal size, structure, and morphology can lead to the production of materials with superior properties beyond what is achievable by conventional routes. In this talk I will discuss two general mechanisms of crystal growth: (1) classical pathways involving 2-dimensional layer nucleation and advancement on crystal surfaces through monomer addition; and (2) nonclassical pathways, termed crystallization by particle attachment (CPA), involving the formation of metastable precursors that play a direct role in crystal nucleation and growth. Our group uses techniques such as atomic force microscopy (AFM) to investigate crystallization in situ under solvothermal conditions. We have developed a unique AFM system capable of capturing time-resolved dynamics of surface growth, thus opening new routes to probe complex pathways of crystallization. We also design “modifiers” to control crystal properties such as size and morphology. Modifiers are molecules or macromolecules that interact with specific surfaces of crystals and regulate anisotropic growth rates. In this talk, I will show how we use growth modifiers to control crystallization in two distinctly different, yet fundamentally similar, applications. In the first part of my talk I will discuss our work on the development of therapeutic drugs for crystals implicated in two pathological diseases: kidney stones (calcium oxalate monohydrate) and malaria (hematin). In the second part of my talk, I will discuss how we are using modifiers as a bio-inspired approach to tailor the properties of zeolites, which are microporous aluminosilicates commercially used in catalysis, adsorption, and ion-exchange processes. Topics that will be addressed include the broader challenges of synthesizing zeolites, progress towards elucidating their complex mechanism(s) of growth, and extensive effort to develop commercially-viable approaches to tailor their physicochemical properties.