
Meet our team!
Principal Investigator

Professor
School for Engineering of Matter, Transport and Energy
- [email protected]
- 480-965-8051
- ENGRC 277
Green is the Director of the Center for Negative Carbon Emissions. His research focuses on polymers for use in applications such as water purification, carbon dioxide capture, and nanocomposites.
Postdoctoral Researchers

Marlene Velazco Medel
Member since Fall 2022
- [email protected]
- Ph.D. in Chemistry
(Universidad Nacional Autónoma de México, 2022)
M.S. in Organic Chemistry
(Universidad Nacional Autónoma de México, 2017)
B.S. in Pharmaceutical Chemistry (Universidad de Colima, 2013)
Marlene designs and synthesizes stimuli-responsive and sustainable polymers for applications spanning from drug delivery, medical devices, biotechnology to environmental solutions like CO2 capture. She brings valuable experience in organic synthesis, polymer surface modification and teaching. Outside the lab, she enjoys swimming and dancing.

Mani Modayil Korah
Member Since Spring 2019
- [email protected]
- Ph.D. in Chemical Engineering (Arizona State University, 202)
M.S. in Chemical Engineering (Cornell University, 2014)
B.Tech. in Chemical Engineering
(National Institute of Technology Calicut, 2011)
He is working on amino acid and guanidine-based polymer Direct Air Capture (DAC) sorbents. He is trying to commercialize activated carbon-potassium carbonate-based DAC sorbents. Outside the lab, he loves playing the piano and is an awesome cook.

Kacie Niimoto
Member Since 2020
- [email protected]
- Ph.D. in Chemical Engineering (ASU, 2025)
M.S. in Mechanical Engineering (University of Hawaii at Mānoa, 2020)
B.S. in Biological Engineering (University of Hawaii at Mānoa, 2018)
Kacie investigates the chemistry and transport physics of moisture-swing sorbents for direct air capture (DAC). After encountering limits with conventional kinetic models, she developed numerical simulations to clarify when model fitting fails to represent physical behavior and is now building a physically grounded model of moisture-swing dynamics.

Lindsey Hamblin
Member Since Summer 2021
- [email protected]
- Ph.D. in Chemical Engineering (Arizona State University, 2025)
B.S. in Chemical Engineering (University of Colorado Boulder, 2021)
Lindsey’s dissertation examined integration of low-grade waste heat within DAC processes, specifically focusing on feasibility within data. She now focuses on scaling and instrumentation for DAC at ASU’s Center for Negative Carbon Emissions. Originally from Colorado, she came to Arizona for her Ph.D. and enjoys hiking with her dog (weather permitting) and playing Dungeons & Dragons.
Ph.D. Students

Ani Nazari
Chemical Engineering
Member since Spring 2021
- [email protected]
- B.S. in Chemical Engineering
(California State Polytechnic University, Pomona, 2016)
Ani investigates degradation mechanisms in sorbents used for moisture-swing direct air capture (DAC). She worked as an environmental and quality engineer at Marathon Petroleum Company, the California Air Resources Board, and Biosense Webster after her undergraduate studies. Outside the lab, she enjoys traveling, scuba diving, hiking, swimming, kickboxing, weightlifting, playing with her puppy, and reading horror stories.

Deepak Narayana Murthy Akundi
Chemical Engineering
Member Since Fall 2022
- [email protected]
- B.Tech. in Chemical Engineering
(National Institute of Technology Calicut, India, 2022)
Deepak works on the synthesis and characterization of novel polymer-based sorbents for efficient direct air CO₂ capture supported by NSF. He studied Poly sulfone nanofiltration membranes for wastewater treatment during his undergraduate studies. Outside the lab, he enjoys dancing, badminton, squash, movies, and rewatching Friends.

Mitesh Patil
Materials Science and Engineering
Member Since Fall 2022
- B.Tech. in Surface Coating Technology
(Institute of Chemical Technology Mumbai, India, 2022)
Mitesh works to develop new tools for sorbent heat management, regeneration pathways, and process optimization Autothermal Direct Air Capture and Moisture Swing processes. He focuses on the design, construction, and modelling of experimental systems that probe adsorption thermodynamics and kinetics to understand CO₂/H₂O adsorption -desorption, energy efficiency, and system performance under realistic conditions. Beyond the lab, he enjoys dancing, gaming, camping, and driving.

Romina Keshavarz
Materials Science and Engineering
Member since Fall 2023
- [email protected]
- M.S. in Engineering Science (Clarkson University, 2023)
B.S. in Materials Science and Engineering
(K. N. Toosi University of Technology, 2020)
Romina’s research is focused on stimuli-responsive polymer nanocomposites. She is pursuing a Ph.D. in Materials Science and Engineering at ASU. In her free time, she enjoys hiking, researching, and skating.

Anusha Richelle Henry Raj
Materials Science and Engineering
Member since Spring 2024
- [email protected]
- B.Tech. in Materials Science and Engineering (Anna University, 2023)
Anusha develops and evaluates the performance of poly(zwitterionic) thermo-responsive hydrogels for atmospheric water harvesting (AWH) and direct air carbon capture. Outside research, she enjoys reading, hiking, and board games.

Saheed Raheem
Materials Science and Engineering
Member since Spring 2024
- [email protected]
-
- M.S. in Physics (University of Lagos, 2018)
B.S. in Physics (Lagos State University, 2014)
Saheed’s research focuses on ocean carbon capture and treatment of hypersaline waters using chemically modified Poly sulfone membranes, with a focus on material innovation and electroactive integration to boost CO₂ removal and overall performance.

Shahanaz Munnir
Materials Science and Engineering
Member since Fall 2024
- [email protected]
- M.S. in Polymers (University of Leeds, 2019)
M.S. in Materials Science (Indian Institute of Science, 2018)
B.S. in Materials Science (Indian Institute of Science, 2017)
Shahanaz develops emulsion-templated polyHIPEs—porous polymer networks designed for efficient adsorption of CO₂ from ambient air. Outside the lab, she enjoys reading, traveling, and experimenting in the kitchen.

Marcellinus O. Ugwu
Chemical Engineering
Member since Fall 2024
- [email protected]
- B.S. in Chemical Engineering (Caritas University, Enugu, 2022)
Marcellinus designs systems-level water management in direct air capture technologies. He enjoys dancing, reading thought-provoking books, playing video games, and watching action films.

Ramesh Babu Komma
Chemical Engineering
Member since Spring 2025
- [email protected]
- B.S. in Environmental Science
(Penn State Behrend, Schreyer Honors College, 2023)
Ramesh improves chemically modified Polysulfone membranes for treating hypersaline waters and investigates microstructure performance relationships in sorbents for gas separations, including direct air capture. Outside research, he enjoys cricket, films, Carnatic music, and cooking.
Undergraduate Students

Weiyu Wu
Environmental Chemistry
Member Since Fall 2023
He is designing amino acid-based sorbents for Direct Air Capture (DAC) and optimizing both lifetime and energy input for regeneration of DAC sorbents. He loves watching movies, reading novels, playing billiards and video games especially Diablo 4 and Pillars of Eternity 2.

Sarina Roy-Moder
Electrical Engineering & Minor in Materials Science & Engineering
Member since Spring 2024
She is working with composite materials (carbon nanotubes) and cross-linked polymers to enhance material properties and performance. She investigates structure property relationship to optimize material properties. Outside the lab, she is passionate about writing and photography. As a published author, she has written poetry and short stories in her free time, expressing my perception and experiences. She loves watching sunsets and capturing moments in nature on camera, designing the ideal perspectives and angles to recreate a lived moment.

Sriya Sridhar
Chemical Engineering
Member since Summer 2024
Sriya fabricates and tests electro spun poly (vinyl alcohol) (PVA) fibers to create hyper cross-linked, high-surface-area sorbents with tailored structure and chemistry for stronger water-mediated interactions. This work advances scalable materials for direct air capture under ambient humidity.
High School Student

Sarah Bendok
High School Student
Member since Spring 2025
Under the mentorship of Dr. Marlene Velazco-Medel at ASU’s Center for Negative Carbon Emissions, Sarah synthesizes hydrogel sorbents for carbon capture, evaluating CO₂ adsorption, thermal stability, and material properties through FTIR and TGA analysis. She also tests polyisoprene-based adhesives, combining literature review with experiments on adhesive strength and rheology, with the goal of developing a CO₂-Capturing Adhesive.
Alumni
- Taysha Telenar (Ph.D. 2025) – Postdoc at Lind Lab, ASU
- Lindsey Hamblin (Ph.D. 2025) – Postdoc at Green Research Lab
- Kacie Niimoto (Ph.D. 2025) – Postdoc at Green Research Lab
- Husain Mithaiwala (Ph.D. 2024) – Dupont, Virginia
- Hoda Shokrollahzadeh Behbahani (Ph.D. 2024)
- Brad Grim (Ph.D. 2024)
- Cameron Morgan (B.S.E. 2024)
- Emmie Bernard (M.S. 2024)
- Adarsh Bakkireddy (M.S. 2023) – Intel
- Zahra Khademmodaresi (Postdoc. 2023)
- Jae Sang Lee (Ph.D. 2023) – Applied Materials
- Mani Modayil Korah (Ph.D. 2023) – Postdoc at Arizona State University
- Salma Ly (B. S.E 2023) – Boeing
- Jasmine Chase (B. S.E 2023)
- Yuta Kaneko (Ph.D. 2023)
- Adam Martin (M.S. 2022) – NXP semiconductors
- Monique Weber (M.S. 2022) – Intel
- Rahul Rakesh Saini (M.S. 2022)
- Douglas Pivonka (B.S.E 2021)
- Alexis Hocken (B.S.E 2021) – Ph.D. student at Massachusetts Institute of Technology
- Tejaswi Nori (M.S. 2021) – Ph.D. student at University of Maryland
- Kari Trimble (M.S. 2020) – Intel
- Michael Tran (M.S. 2020)
- Meng Wang (Ph.D. 2020) – Postdoc at Lehigh University
- Yi Yang (Ph.D., Postdoc. 2020) – Intel
- Dhruv Dholaria (M.S. 2019)
- Daniel Rivera (B.S.E. 2019) – Ph.D. student at Arizona State University
- Zach Tronstad (B.S.E. 2019) – Ph.D. student at University of California, Berkeley
- Nick Silva (B.S.E. 2019)
- Usamma Amjad (M.S. 2018) – Intel
- Katelyn Kline (M.S. 2018) – WL Gore
- Srishti Gupta (M.S. 2018) – Ph.D. student at Arizona State University
- Tyler Piper (M.S. 2018) – Olin Corporation
- Jack Felmly (M.S. 2017)
- Varun P. Kelkar (M.S. 2017)
- Jeffrey Quinn (M.S. 2017) – Sandia National Laboratory
- Kristen Brown (M.S. 2017) – Boston Scientific
- Ana Nelson (B.S.E. 2017)
- Madeline Lent (B.S.E. 2017)
- Alexander Bridge (B.S.E. 2017) – Pursuing a Ph.D. at University of Texas at Austin
- Justin Easa (B.S.E. 2017) – Pursuing a Ph.D. at Notre Dame
- Rama Srinivasan (M.S. 2016)
- Pummy Singh (M.S. 2016) – Intel
- Joe Gaustad (B.S.E. 2016) – IM Flash
- Felicia Romero (B.S.E. 2016) – Stellana
- Anna Moe (B.S.E. 2016) – Pursuing a JD at Cornell Law School
- HeeRan Hong (M.S. 2015)
- Mohammed Altraiki (M.S. 2015) – Schlumberger