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Electron Nanoscopy Group

IIT Hyderabad

Our group primarily focuses on understanding and visualizing the structure‑property relationships in materials using in-situ TEM techniques. Headed by Sai Rama Krishna Malladi (SRKM) an Assistant Professor in the department of Materials Science and Metallurgical Engineering at Indian Institute of Technology Hyderabad, our interest is to explore and develop characterisation techniques to all kinds of materials. Presently we are working on phase transformations in metallic alloys, Electrochemsitry and Corrosion, Graphene based super capacitors and Materials for Energy Applications

 

Sai Rama Krishna Malladi

Profile Summary of the Principal Investigator

With a background in Materials Science & Engineering, I completed my PhD in the area of in-situ Transmission Electron Microscopy (TEM) at the Kavli Institute of Nanoscience Delft, Delft University of Technology under the supervision of Prof. Henny Zandbergen. These studies resulted in visualising the well-known yet unpredictable problem of localised corrosion in aluminium alloys in real time at the sub-micron scale for the first time!

At Delft, I gained invaluable hands-on experience and had the unique opportunity to be involved in the development and testing of a range of in-situ TEM holders, most of which are now commercial products. As a Postdoctoral Researcher at TU Delft, I mastered the cleanroom techniques to fabricate MEMS-based devices and had the opportunity to collaborate closely with the group of Prof. Rafal Dunin-Borkowski at Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C), Forschungszentrum Jülich (FZ-J), Germany.

Since February 2017, I started working as an Assistant Professor in the Department of Materials Science & Metallurgical Engineering, Indian Institute of Technology Hyderabad. Since February 2013, I've also been a visiting scientist at Prof. Dunin-Borkowski's group at FZ-J, Germany. My primary research interests include the science of materials under external stimuli as studied by TEM and the development of newer in-situ experimental techniques.

 

Ongoing Research

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Graphene and 2D-layered materials based liquid cells for in-situ TEM

Liquid cell electron microscopy is a promising area of research which is crucial to gain a better understanding of various phenomena in Materials Science and Engineering. Whether it is the nucleation and growth of Nanoparticles or understanding the interfacial charges that contribute to supercapacitance, investigating these phenomena using static liquid cells is one of the domains of research in our group.

Structure-property correlation in Metallic Alloys

Recently, High Entropy Alloys (HEAs) have attracted a lot of research attention due to their exceptional properties. In collaboration with Prof. Pinaki Prasad Bhattacharjee, we are exploring the enhancement of mechanical as well as corrosion properties of Eutectic High Entropy Alloys (EHEAs) through microstructural characterisation techniques ranging from ex-situ, quasi in-situ as well as in-situ electron microscopy.

 

Unraveling nanoscale phenomena in materials through in-situ TEM techniques

In-situ TEM studies play a crucial role in revealing the nanoscale or even atomic level phenomena that influence the properties of materials. The example shown here is the nucleation and growth of Cu-rich precipitates in Al matrix on heating. The specimen is prepared using an FIB and is oriented along the <001> zone axis. The video is acquired in STEM-HAADF mode while heating at 160°C. See https://doi.org/10.1038/s41598-017-02081-9 for more details.
It is possible to carry out such studies with heating, static and flowing liquid, static gas and under electrical bias at our group.

 

Contact Us

Thanks for your interest in our research. Get in touch with us for any questions or comments regarding our work and publications. We’d love to hear from you.

Academic Block B-315. Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, India

+91 40 2301 6560

 

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