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Welcome to the Website of
Dr. -Ing. Venkata Sai Kiran Chakravadhanula

THIS WEBSITE IS PRESENTLY UNDER MAINTAINENCE

About Me

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Dr.-Ing. C. V. S. Kiran

Lead, R&D and Strategy

Skyroot Aerospace Pvt. Ltd

Hyderabad, India

+91 9441277890 / cvskiran(at)gmail.com

Skills

Materials Characterization

Transmission Electron Microscopy and Spectroscopy

In situ Electron Microscopy

SEM & FIB

Vapor Phase Deposition/Thin Solid Films

Image Processing

Networking

Languages

Telugu

English

German

Hindi

Tamil

Sanskrit

Malayalam


Work Experience

Lead, R&D and Strategy

R & D and Strategy,
Skyroot Aerospace Pvt. Ltd.

Feb 2021 - Current

Responsible as Head, R&D and Strategy.

Director R&D

Research and Development,
AnanthaP

Jan 2021 - Current

Responsible as Director R&D.

Scientist / Engineer

Vikram Sarabhai Space Centre (VSSC),
Indian Space Research Organisation (ISRO)

March 2018 - Jan 2021

Responsible for the Transmission Electron Microscopy (TEM) and Spectroscopy at Materials Characterization Division.

Project Scientist(Senior Level 2)

Center for Materials Characterization and Testing (CMCT),
International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI)

Nov 2017 - Feb 2018

Responsible for TEM studies of materials used for electrochemistry.

Scientist

Helmholtz Institute Ulm (HIU) for Electrochemical Energy Storage,
Karlsruhe Institute of Technology (KIT)

July 2011 - Nov 2017

Electron Microscopy and Spectroscopy Group, Institute of Nanotechnology (INT), KIT.
Karlsruhe Nano Micro Facility (KNMF), KIT, Karlsruhe, Germany.

Scientific Staff

Synthesis and Real Structure of Solids (SRS),
Technical Faculty of the Christian-Albrechts-University (CAU), Kiel, Germany.

March 2009 - June 2011

Transmission Electron Microscopy and Spectroscopy of Al-rich Ti-Al alloys. Initiation of new projects, collaborarations and establishment of electron tomography technique for the institute.

Scientific Staff

Chair for Multicomponent Materials,
Technical Faculty of the Christian-Albrechts-University (CAU), Kiel, Germany.

March 2006 - Feb 2009

Synthesis and characterization of swift heavy ion (SHI) beam irradition of metal-polymer and metal-oxide based nanocomposites for optical applications.


Education

PhD / Doctoral Degree (Dr. -Ing.)
Institute for Materials Science, Christian Albrechts University (CAU), Kiel, Germany - April 2011

Vapor Phase Deposition of Functional Nanocomposites and their Modification by Ion Beam Irradiation

Masters Degree in Materials Science and Engineering
Technical Faculty, Christian Albrechts Universität Kiel, Germany - 2003 - 2005

Masters Thesis: Synthesis and Characterization of 2D and 3D Au/Ag Polymer Nanocomposites for Optical Applications

Bachelors Degree in Metallurgy and Materials Technology (B.Tech)
Mahatma Gandhi Institute of Technology (MGIT), Jawaharlal Nehru Technological University (JNTU), Hyderabad, 1999 - 2003

Bachelor Thesis: Synthesis of Amorphous Carbon and Densification by Chemical Vapor Infiltration, carried out at Bhabha Atomic Research Centre (BARC), Mumbai, India


Honors and Recognitions

Excellence in Microscopy in recognition for application of Electron Microscopy in the field of Materials Science - Electron Microscopy Society of India (EMSI)

2020

Fellow - Andhra Pradesh Akademi of Sciences (APAS)

2017

ABAP Gold Medal for Advanced Research in Nanoscience and Technology

2017

Outstanding Scientist of the Helmholtz Institute Ulm (HIU), Karlsruhe Institute of Technology (KIT)

2016

Outstanding International Student Award - Deutscher Akademischer Austauschdienst e.V. (DAAD)

2008

Memberships

Supporting the promotion of the development and acceptance in the field

  • Elected member of the First Convent of the Scientists at the Karlsruhe Institute of Technology 10/2015 - 11/2017

  • Member of European Microscopy Society (EMS)

  • Member of Deutschen Gesellschaft für Elektronenmikroskopie e.V. (DGE)

  • Life Member - Indian Institute of Metals (IIM)

  • Life Member - Electron Microscopy Society of India (EMSI)

  • Life Member - Materials Research Society of India (MRSI)

  • Life Member - Powder Metallurgy Assiciation of India (PMAI)

  • Life Member - Magnetic Society of India (MSI)

Patents

Stimulating and promoting research in the field

  • International Patent, Omni-directional Transparent Conducting Metal based Plasmonic Nanocomposite: DE 10 2010 050 110.7.

    • Grants

    Government Grants are through government agencies to projects that benefit the public through peer-reviewed selection process to researchers or organisations

  • Deutsche Forschungsgemeinschaft/German Research Foundation (DFG) Grant - FOR 2093 : Principal Investigator for Nanostructure of Materials for Memristive Switching Processes - In situ (S)-TEM. # CH 1492/1-1.

    • Software / Hardware Expertise

    Computer hardware and software are additinal tools that support us in daily R&D activities

  • Advanced Diploma in Software technology from Computer Management Corporation (C.M.C.) of India Pvt. Ltd, India 2000-2003.

  • Extensive knowledge in C, C++, Windows 95, XP, 7,8, Mac OSX, Windows-Server and associated Software-Installations, Visual Studio, Unix, Java, Oracle, SQL, etc.

  • Extensive experience in Server and Firewall - Building and Maintenance (Windows Server, Synology, Pfsense), Literature searching and Management software(Courses also offered).

  • Design and maintenance of Internet-sites: http://www.cvskiran.com.

  • Office programs & Graphical programs (CorelDraw, Digital Micrograph, Titan imaging and analysis - TIA, ImageJ, JEMS, CRISP, Calidris, Diamond).

    • Invited Talks

    Establishing collaborative connections by disseminating research

    Sl.No Conference/Meeting/Institute Date & Location Title
    34 STEM-2020: Online Seminar on Special Techniques in Electron Microscopy for Materials Science Applications Nov 06-07, 2020; IIT-Bhubaneshwar, CSIR-IMMT, EMSI ; WEB On the Transmission Electron Microscopic Studies of Aerospace Alloys
    33 APMC12: 12th Asia Pacific Microscopy Conference, APMC-2020 Feb 03-07, 2020, Hyderabad, India Nanoscale Microstructural Characterization of Additively Manufactured IN718: A Comparison with Wrought IN718
    32 DAE Solid State Physics Symposium 2017 Dec 26-30, 2017, Mumbai, India All Solid State Batteries: High Resolution Ex situ and In situ Analysis of Battery Chemistries beyond Lithium
    31 Intl. Conference on Innovations in Pharma & Biopharma Industry Dec 20-22, 2017, Hyderabad, India
    30 APSC 2017, AP Science Congress 2017 Nov 2017, Vishakhapanam, India High Resolution Characterization in Translational Nanomaterials
    29 All-Solid-State Batteries, University of Bremen July 14, 2017, Bremen, Germany Electrochemistry inside the TEM: An in situ TEM
    28 XXXVIII Annula Meeting of the Electron Microscopy Society of India EMSI 2017 July 17-19, 2017, Mahabalipuram, India Recent Advances in in situ transmission electron microscopy of electrochemical material systems
    27 3rd International Freiberg Conference on Electrochemical Storage Materials EStorM, Advanced approached for elucidating electrochemical energy storage and conversion June 12-14, 2017, Freiberg, Germany Electrochemistry at the nanoscale: in situ transmission electron microscopy
    26 Symposium & Workshop on Advanced In-situ Electron Microscopy, Academic Centre for Materials and Nanotechnology May 17-18, 2017, Krakow, Poland Stimuli based nanochemistry inside the electron microscope
    25 Electrochemie - Anwendungen in Forschung und technik, C3 Prozess- und Analysentechnik March 27-28, 2017,Frankfurt, Germany Nanoscale Electrochemistry inside the electron microscope
    24 International Conference on Magnetc Materials and Applications, ICMAGMA-2017 Feb 01-03, 2017, Hyderabad, India Magnetic Materials: An in situ TEM approach
    23 Defence Metallurgical Research Laboratory, Hyderabad Dec. 2, 2016: Hyderabad, India In situ stimuli based characterization of materials at high spatial resolution
    22 International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad Dec 01, 2016, Hyderabad, India From conventional towards in situ stimuli based characterization of materials through TEM
    21 Department of Metallurgy and Materials Engineering, IIT Madras & Indian Institute of Metals - Chennai Chapter Nov 28th 2016, Chennai, India From beam sensitivity towards in situ electrochemistry in the TEM
    20 JEOL JEM-F200: The new world of In-situ Applications - JEOL F2 and Gatan:JEOL GmbH Oct 20 2016, Freising, Germany Challenges and Possibilities with in situ TEM studies
    19 International Conference on Electron Microscopy along with The XXXVII Annual Meeting of the Electron Microscope Society of India (EMSI), Indian Institute of Technology IIT-BHU May 30 - June 4, 2016, Varanasi, Uttar Pradesh, India From beam sensitivity towards in situ electrochemistry in the TEM
    18 Department of Metallurgy and Materials Engineering, IIT, Chennai January 11, 2016, Chennai, Tamil Nadu, India Stimuli based in situ characterization of materials at high spatial resolution
    17 International Conference on Advances in plant and microbe research - ICAPMR 2016 January 6-8, 2016, Guntur, Andhra Pradesh, India Electron Microscopic characterization of biological materials
    16 Department of Chemistry, Defence Institute of Advanced Technology, DAIT January 5, 2016, Pune, India Transmission electron microscopy: Current Status and Future Outlook
    15 Department of Mechanical Engineering, GITAM school of technology, Hyderabad campus January 2, 2016, Hyderabad, Telangana, India Recent advances in Transmission Electron Microscopy
    14 Department of Physics, Acharya Nagarjuna University January 1, 2016, Guntur, Andhra Pradesh, India High spatial resolution stimuli based in situ characterization of materials using TEM
    13 Department of Mechanical Engineering, Acharya Nagarjuna University January 1, 2016, Guntur, Andhra Pradesh, India Stimuli based in situ characterization of materials using TEM
    12 Department of Physics, Sri Venkateswara University December 31, 2015, Tirupati, Andhra Pradesh, India High spatial resolution stimuli based in situ characterization of materials using TEM
    11 International Conference on Electron Microscopy and XXXVI Annual Meeting of the EMSI July 8-10, 2015, Mumbai, India In situ TEM Electrochemical Studies of a Fluoride based Solid-State Battery
    10 International Conference on Electron Microscopy of the EMSI July 9-11, 2014, New-Delhi, India Reversible in situ TEM electrochemical studies of Fluoride Ion Battery
    09 Research and Development Unit, Dabur India Pvt. Limited July 11, 2014, New-Delhi, India Characterization of Ayurvedic Bhasmas by Transmission Electron Microscopy
    08 International Conference on Electron Microscopy and the XXXIV Annual Meeting of the EMSI July 3-5, 2013, Kolkata, West Bengal, India Structure and deformation processes of nanocrystalline metals characterized by ACOM-STEM in combination with in situ straining
    07 Defence Institute of Advanced Technology, DIAT January 11, 2012, Pune, India Advanced transmission electron microscopy of nano-structured materials
    06 Delhi University, EMSI North zone, New-Delhi Dec 7, 2011, New-Delhi, India Recent advances in transmission electron microscopy of nano-structured materials
    05 National Physical Laboratory (NPL), CSIR-NPL, New-Delhi Dec 8, 2011, New Delhi, India Transmission electron microscopy of nano-structured materials
    04 Indian Institute of Chemical Technology(IICT), CSIR-IICT December 2011, Hyderabad, Andhra Pradesh, India Advanced transmission electron microscopy of nano-structured materials
    03 International conference on nanomaterials: synthesis, characterization and applications (ICN-2010) April 27-29, 2010, Kottayam, Kerala, India Synthesis and characterization of the functional metal-polymer and metal- oxide based nanocomposites
    02 International conference on advances in polymer technology (APT-2008) September 25-27, 2008, Kochi, Kerala, India Functional applications of Metal-Polymer Nanocomposites
    01 Second international conference on polymer blends, composites, IPN's, membranes, and gels: macro to nano scales (ICBC - 2008) September 22-24, 2008, Kottayam, Kerala, India Polymer-nanocomposites for functional applications

    Research

    Pursuing research questions of scientific significance cuts across and combines two, three, or multiple areas. In this process, following areas are the research areas in which work has been carried out.


    Nanoscale studies in Materials in their Actual Environment

    In situ Electron Microscopy is the emerging field of electron microscopy involving electron microscopy under dynamic conditions with various stimuli. Based on these stimuli used, a variety of techniques/method are divided and are termed as in situ TEM techniques. Research and Developmental activities in these fields are gaining increasing importance, as the demands from the synthesis and fabrication groups increase, requiring the dynamics of materials modifications during their processes, understanding the basics of the process, therby leading towards an efficient material, its process and its properties. As an example, the video below depicts in situ TEM in liquids towards understanding the growth of Ag within a AgNO3 solution using an Posseidon single tilt sample holder from Protochips Inc. More information: Link

    In situ Transmission Electron Microscopy of Memristive Materials

    Memristors are nanoscale resistive switching devices. Memristors have been of huge interest for memory, logic and neuromorphic applications in the recent times. Generally, their switching effects in dielectric-based devices are assumed to be caused by conducting filament formation across the electrodes. But the nature of the filaments, their growth mechanisms and dynamics are in huge debate, which demand in situ high spatial resolution characterization techniques. In situ transmission electron microscopy with its imaging, structural and compositional analysis at the nanoscale is an optimum technique to understand the growth mechanisms and dynamics. Through systematic ex situ and in situ TEM studies on nanoscale devices under various programming conditions, the underlying mechanisms can be identified. The results obtained through deserve particular attention for continued device optimization.

    Battery Materials

    Research in the field of energy storage systems has gained huge importance in all sectors of  life. Batteries contribute towards the major systems of Energy strorage systems. Improving the cycling capabilities, energy storage capacities, safety and security are the primary aspects which need a deeper understanding of the individual components of the battery i.e., Electrodes and Electrolytes. Presently there is exploding research towards development of new battery chemistries, new nanostructures of the individual components towards meeting the energy storage demands of the world. Therby leading to huge demand for high spatial resolution characterization of such components not only in the as-prepared state but also during various stages of cycling or even after cycling. In all the aforementioned cases, TEM offers a good choice, towards acheiving high spatial resolution. But the expectations of the researchers towards TEM has also been increasing with the advances of in situ electron microscopy, towards understanding the morphological, structural and compositional changes during the process of charging and discharging. For this purpose, the effective dose of the individual components of the battery are pivotal, ignoring which leads to the analysis of electron beam modified components as components of the battery. Thus modifying the complete electrochemistry of the battery. Analysis of individual components of the battery, their beam stability and the critical electron dose under varying imaging techniques become the key parameter. Hence understanding the radiation damage (either Radiolysis, Knock-on-damage or sputtering and heating) leading to either crystallization, amorphization or removal of material remains pivotal. Understanding this thereby leads towards "Better Materials for a Bettery Battery thereby Better Energy Storage System for a Better Tomorrow".

    Understanding the Electrochemical Cycling at Nanoscale in Battery Materials

    Research in the field of in situ energy storage systems has gained huge importance in the present decade where batteries, besides being pivotal, also needs improving in their cycling capabilities, energy storage capacities, safety and security which need a deeper understanding of the interfaces of the battery i.e., Anode-Electrolyte and Cathode-Electrolyte. Many research groups around the world try to understand this towards the development of new battery chemistries, new nanostructures of the individual components towards meeting the energy storage demands of the world. TEM, being a high spatial resolution characterization tool enables the understanding of the variations or modifications at the nano-scale. Together with in situ sample holders with continous imaging during any experiment, high spatial resolution involves higher electron doses, increasing the effective dose applied on the system that might lead to radiation damage. Towards understanding the morphological, structural and compositional changes during the process of charging and discharging during an in situ TEM electrochemical cycling experiments, electron microscopists might be misled towards studying the electron beam modified materials and their electrochemical cycling. Effectively the calculation of the critical dose of the individual components of the battery in separate experiments are pivotal. Ignoring this might leads to the analysis of electron beam modified components as components of the battery, thereby studying the electrochemistry of the electron beam modified battery. More information: Link

    Characterization of Traditional Indian Materials

    Indian rich traditions have a variety of cultural heritage. Traditionally there have been a healthy era of non-processed (traditionally-processed) materials, used in day to day activities. Many of these materials have been used even today in villages, because of the knowledge given by the ancestors. Unfortunately less scientific evidence exists. An effort is here made to correlate the known functionality or the properties with a scientific understanding by studying the morphology, structure and chemical compositon of the corresponding materials.

    Indexing, Mapping and Evaluating the Indian Electron Microscopy Facilities


    Based on the understanding of various EM facilities around the world and the experience gained in establishing collaborations, I myself initiated a project on the evaluation of EM characterization facilities in India in a view to enhance the future perspective and dream of establishing a network in addition towards establishing state-of-the-art characterization facility for India. This report will be published and would aid towards this dream. In the google map above you find all the FEI TEM's-Blue Color, JEOL TEM's-Green Color and Hitachi TEM's-Brown Color. The EMSI zonal headquarters are also available, but one has to open the flap out and select EM Soceities and unselect the TEM.

    Understanding Biological Materials for their Structure and Morphology

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    Nanoscale Characterization of Ayurvedic Bhasmas

    Ayurvedic medicines are nano-/micro- materials made by all-green technologies and are the Traditional Indian Medicine. Actual prepration strategies and recepies are mentioned in the vedas. This alternate medicine has proved to be very helpful in treating diseases. But characterization of such materials involves high resolution techniques in addition to bulk characterization techniques. Morphology, Structure and Compositional analysis is pivotal towards the establishment of standards for the Ayurvedic medicines or "Bhasmas".

    Magnetic Domains in Magnetic Materials

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    Structure, Composition and Morphology of Nanomaterials

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    Understanding the Structure, Morphology and Composition in ternary Ti36Al62Nb2 Alloy

    Al-rich Ti-Al alloys attracted some attention during the past years due to the possibility of their application as light-weight, high-performance materials at elevated temperatures. The effect of the addition of Nb to Al-rich Ti-Al alloys has been studied for Ti36Al62Nb2 by a combined approach of transmission electron microscopy (TEM) techniques for unraveling the structure and composition at the nanoscale. Structural analyses on as-cast ternary alloys revealed the presence of h-TiAl2-, Ti3Al5- and ?-TiAl-type phases. After heat treatment, phase transformations like the replacement of the metastable h-TiAl2-type by the stable r-TiAl2-type were identified. Additionally, changes of the microstructural features like the formation of interfaces with different orientation relationships are apparent. The orientation and interfacial relationships involved are compared to those of binary Ti-Al alloys rich in Al. More information: Link

    Changes in Materials upon Heating

    A study involving the in situ heating of the TiO2 based nanocomposites in the TEM confirms the absence of the formation of TiO unlike the SHI irradiation. Changes of the microstructure of the nanocomposite film upon annealing allowed demonstrating the absence of the formation of TiO but rather only the crystallization of the TiO2.

    3D Morphology of Nanocomposite Materials

    Unlike the case of polymers, in the case of Ag nanoparticles on TiO2, segregation of the clusters on the surface also provides a fast pathway for Ostwald ripening without any restrictions by elastic distortions at least for those clusters which are in direct contact with the surface. 3D electron tomography was employed on the TiO2 based nanocomposite thin films to explain the two step model for the particle size distribution. First step involved the formation of small nanoparticles during vacuum phase deposition or on the growing surface. Second step after the deposition process involved the formation of larger particles through particle coarsening by Ostwald ripening and surface segregation. More information: Link

    Irradiation of Materials and their Characterization: Materials' response to extreme Environment

    Tuning the optical properties of nanocomposites can be achieved by using swift heavy ion irradiation (SHI) of the nanocomposites. The SHI beamlines from both the Hahn Meitner Institute in Berlin, Germany and the Inter University Accelerator Center in New-Delhi, India, were employed in this work. The TiO phase formation on SHI irradiation with increasing fluence was understood by the interaction of two different counteracting mechanisms, where at lower ?uences, the tendency towards the formation of TiO existed with the larger unaffected areas and at higher fluences, the destruction of the evolved TiO phase into fragments was evident. This served as an evidence for the counter play between "hit" and "no hit", "single hit" and "multiple hits" processes. More information: Link

    Synthesis and Characterization of Nanocomposite Thin Films

    Nanocomposite thin film coatings with a wide range of metal volume fractions were prepared by co-sputtering of TiO2/Teflon and Ag/Au/Cu from two different magnetron sources simultaneously in a home made deposition chamber under high vacuum conditions. Two different types of host materials a polymeric (PTFE) and a ceramic (TiO2) were studied in this work. Morphology, optical and antibacterial properties of these nanocomposites were examined. The formation of metallic nanoparticles upon vapor phase co–deposition of a metal and a dielectric matrix component can be understood in terms of the high cohesive energy of the metal and the low metal-matrix interaction energy which lead to high metal atom mobility on the growing composite surface and metal aggregation whenever metal atoms encounter each other or a metal cluster. In addition, efforts towards tuning of the double plasmon resonances by tailoring the dielectric separation were carried out. Bimetallic nanocomposites based on sandwich geometry in polymer system, the changes in the particle plasmon spectra of sandwiched Au nanoclusters as a result of the presence of Ag nanoclusters in their vicinity and vice versa was studied. Also, the optimum dielectric barrier thickness for the observation of equal intensity double plasmon resonance was reported. Functionality of the nanocomposites in terms of the antibacterial properties was studied. Cultures of B.megaterium, S.aureus, S.epidermidis and E.coli were used to study the effect on the Ag-TiO2 nanocomposites. Additionally, silver ion release studies were carried out at dfferent MVFs by using X-ray photoelectron and UV-Vis/NIR spectroscopies. More Information: Link

    Contact Me

    Address

    10-20/19/1, Gokhalenagar, Ramanthapur

    Hyderabad, Telangana, India

    +91 9441277890

    cvskiran{at}gmail.com

    Dr.Ing. C. Venkata Sai Kiran's site

    IMPRESSUM

    Dr.-Ing. Venkata Sai Kiran Chakravadhanula
    Email: cvskiran{at}gmail.com

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