N.R. Sasirekha, K. Shanthi, and T. Sivakumar, ‘Photoenhanced reduction of carbon dioxide on various titania semiconductors’, 5^th National Symposium in Chemistry, Central Leather Research Institute, Chennai, February 2003.

N.R. Sasirekha, C. Mahendiran, and K. Shanthi, ‘Effect of Cu doped titania on photocatalytic reduction of carbon dioxide’, 17^th National Symposium on Catalysis, Central Salt and Marine Chemicals Research Institute, Bhavnagar, January 2005.

National Symposium on Recent Trends in Nanoscience & Technology, Nanorevelations (September 2010), Anna University of Technology, Tiruchirappalli, India.

Seminar on Municipal Solid Waste Management, SWSWM-2010 (October 2010), Anna University of Technology, Tiruchirappalli, India.

National Seminar on Role of Renewable Energy in Energy Conservation REEC 2010 (December 2010), Anna University of Technology, Tiruchirappalli, India.

Seminar on Societal implications on Nanoscience & Technology (December 2010), Anna University of Technology, Tiruchirappalli, India.

National Conference on Recent Trends in Renewable Energy Sources for Sustainable Development (February 2011), Anna University of Technology, Tiruchirappalli, India.

One day awareness programme for teachers on Heuristic approach in Teaching, AT-HEAT (March 2011), Anna University of Technology, Tiruchirappalli, India.

21^st National Symposium on Catalysis (CATSYMP 21) “Catalysis for Sustainable Development” (February 2013), Indian Institute of Chemical Technology, Hyderabad, India.

One day Workshop on “Photocatalysis for sustainability: Fundamentals and Applications (October 2013)”, Bharathidasan Institute of Technology, Anna University Tiruchirappalli, India.

N.R. Sasirekha, Yu-Wen Chen and K. Palanichamy, ‘Catalytic combustion of toluene on Pd/MnO_x-CeO₂: Effect of preparation method’, 17^th National Workshop on Challenges in Catalysis Science and Technology (CCST-2016), CSIR-Indian Institute of Chemical Technology, Hyderabad, 23–25 June, 2016.

K. Palanichamy and N. R. Sasirekha, ‘Catalytic effect of dry reforming of methane over Pt-Ni modified Mg-SBA-15 catalysts’, Chennai Nanogathering – National Conference on Nanomaterials and Nanobiotechnology (CNG-NCNN’17), National Centre for Nanoscience and Nanotechnology, University of Madras, Chennai, 7–8 February, 2017.

K. Palanichamy, P. Sangeetha and N.R. Sasirekha, ‘Catalytic dry reforming of methane over modified mesoporous materials’, 23^rd National Symposium on Catalysis, Royal Orchid Convention, Bengaluru, 17–19 January 2018.

M. Manikandan, N.R. Sasirekha and P. Sangeetha, ‘Nitrogen-rich porous carbon as a metal-free catalyst for esterification of biomass derived substrates’, 23^rd National Symposium on Catalysis, Royal Orchid Convention, Bengaluru, 17–19 January 2018.

Two days National Level Workshop on “Intellectual Property Rights and Art of Writing Funding Proposals and Journal Articles” (5-6 October 2018), Rajalakshmi Institute of Technology, Chennai, India

N.R. Sasirekha, K. Shanthi and K. Palanichamy, ‘Photocatalytic reduction of carbon dioxide on Fe doped TiO₂–Al₂O₃ under visible light irradiation’, National Symposium on Green Energy and its Green Chemistry for Sustainable Future, Meenakshi College for Women, Chennai, 22–23 February, 2019

T. Karthik, K. Palanichamy, N.R. Sasirekha, S. Balakumar, P. Rajashree, ‘Intranasal drug delivery of quetiapine-loaded mesoporous silica nanoparticle for treatment of psychotic disorders’, National Symposium on Green Energy and its Green Chemistry for Sustainable Future, Meenakshi College for Women, Chennai, 22–23 February, 2019

Two days “National Conference on Recent Advances in Chemistry (January 2019)”, Anna University, Chennai, India

17^th National Workshop on Catalysis for Clean Energy and Sustainable Future (31^st May and 1^st June 2019), IIT-Delhi, India.

Resurgence of Indian System of Medicine (Siddha, Yoga, Naturopathy) & Modern Scientific (Nanoscience) Developments in Pandemic Times, National Centre for Nanoscience and Nanotechnology, University of Madras, Chennai, 25^th July 2020.

K. Palanichamy and N.R. Sasirekha, ‘Syngas production via dry reforming of methane in coke resistant Pt-Ni/AlSBA-15 catalysts’, Recent Advances in Catalysis Science and Engineering (RACSE 2021), organised by Department of Chemistry, National Institute of Technology, Jamshedpur, 26–28 October, 2021

RUSA 2.0 sponsored Webinar on “Nanomaterials for Biomedical Applications”, University of Madras, Guindy Campus, Chennai, 14 August 2021

RUSA 2.0 sponsored Webinar on “Nano Informatics in Healthcare III”, University of Madras, Guindy Campus, Chennai, 11 September 2021

RUSA 2.0 sponsored Webinar on “Emerging concepts and technologies in Nanomaterial based Immunomodulation”, University of Madras, Guindy Campus, Chennai, 12 October 2021

E-workshop cum Discussion Forum on “High-end Characterization of Microalgae: Overcoming the technological barriers, 3–4 March, 2021, TERI-Deakin Nano Biotechnology Centre.

Ganesh S., P. Rajashree and N.R. Sasirekha, ‘Development of nanotherapeutics based on Zn/Meso-HAP for cancer drug delivery’, Biomaterials Online Conclave 2022, National Centre for Nanoscience and Nanotechnology, University of Madras, Guindy Campus, Chennai, 07–15 March, 2022.

S. Arokya Abisha, M. Keerthana, M. Gopinath, P. Rajashree and N.R. Sasirekha, ‘Green synthesis of zinc oxide nanoparticles mediated by aqueous extract of Scoparia dulcis, its characterization and therapeutic activity’, Biomaterials Online Conclave 2022, National Centre for Nanoscience and Nanotechnology, University of Madras, Guindy Campus, Chennai, 07–15 March, 2022.

K. Shanthi, T. Sivakumar, and N. R. Sasirekha, ‘Mesoporous molecular sieve (Al-MCM-41) supported Ni-Mo catalyst for hydrodenitrogenation of o-toluidine and cyclohexylamine’, 15^th Indian National Symposium on Catalysis and Second Conference of the Indo-Pacific Catalysis Association, National Chemical Laboratory, Pune, India, January 2001.

K. Shanthi, N.R. Sasirekha, R. Maheswari, and T. Sivakumar, ‘Hydrodenitrogenation activity of NiO-MoO₃ catalysts supported on various mesoporous aluminosilicates’, 13^th International Zeolite Conference, Montpellier, France, July 2001.

16^th National Symposium and 1^st Indo-German Conference on Catalysis (February 2003), Indian Institute of Chemical Technology, Hyderabad, India.

26^th International Symposium on Nanocatalysis (June 2006), National Central University, Chung-Li, Taiwan.

2006 International Conference on Chemical & Molecular Technologies (ICCMT–2006), National Cheng Kung University, Tainan, Taiwan.

13^th Taiwan-Japan Catalyst Symposium (November 2006), National Taiwan University of Science and Technology, Taipei, Taiwan.

Y.-W. Chen, and N.R. Sasirekha, ‘Nanosized Gold Catalyst for CO Removal’, International Symposium on Environmental Implications and Applications of Nano-sized Materials, National Chung Hsing University, Taichung, Taiwan, December 2006.

Y.-W. Chen, L.-H. Chang, and N.R. Sasirekha, ‘Preferential oxidation of carbon monoxide in hydrogen-rich stream catalyzed by Au/MgO-TiO₂’, Europacat VIII, Turko/?bo, Finland, 26-41 Aug 2007.

L.H. Chang, N.R. Sasirekha, Y.L. Yeh, and Y.-W. Chen, ‘Effect of preparation method of Au/TiO₂ catalyst applied in selective CO oxidation in hydrogen stream’, The 7th Cross-Strait Catalysis Symposium (CSCS-7), Hawlien, Taiwan, 9 Sep 2007.

Y.S. Lai, N.R. Sasirekha, Y.-W. Chen, C.Y. Hsieh, H.J. Chuang, and C.C. Kung, ‘Hydrogen production from catalytic hydrolysis of sodium borohydride solution using NiCoB catalysts’, The 25^th Taiwan Symposium on Catalysis and Reaction Engineering, Taipei, Taiwan, 6 July 2007.

L.H. Chang, N.R. Sasirekha, Y.L. Yeh, and Y.-W. Chen, ‘Selective CO oxidation in hydrogen stream over nano-gold catalysts prepared by photo-deposition method’, The 25^th Taiwan Symposium on Catalysis and Reaction Engineering, Taipei, Taiwan, 6 July 2007.

B. Rajesh, N.R. Sasirekha, J.-H. Shen, and Y.-W. Chen, ‘Hydrogenation of p-chloronitrobenzene over NiCoB nanoalloy catalysts’, 22^nd Conference of the Organic Reactions Catalysis Society, Richmond, VA, USA, March 2008.

Y.-W. Chen and N.R. Sasirekha, ‘Adsorption of H₂, CO, and O₂ with surfaces of supported gold catalysts’, The 6^th Pacific Basin Conference on Adsorption Science and Technology, Taipei, Taiwan, 20-23 May 2012.

Y.-W. Chen and N.R. Sasirekha, ‘Structure and catalytic performance of Au-Pd/TiO₂ for hydrogenation of p-chloronitrobenzene’, 6^th International Conference Gold 2012, Tokyo, Japan, 5-8 September 2012.

Y.-W. Chen, N.R. Sasirekha and K. Shanthi ‘Photocatalytic reduction of carbon dioxide using Pt/TiO₂: Effect of support’, The 6^th Asia-Pacific Congress on Catalysis, Taipei, Taiwan, 13-17 October 2013.

Y.-W. Chen and N.R. Sasirekha, ‘Bimetallic Au-Pd/TiO₂ for hydrogenation of p-chloronitrobenzene’, The 6^th Asia-Pacific Congress on Catalysis, Taipei, Taiwan, 13-17 October 2013.

Y.-W. Chen, N.R. Sasirekha and P. Sangeetha ‘Modified titania for photocatalytic reduction of carbon dioxide: Effect of support’, The 7^th Tokyo Conference on Advanced Catalytic Science and Technology (TOCAT7), Kyoto, Japan, 1-6 June 2014.

Y.-W. Chen and N.R. Sasirekha, ‘Chemoselective hydrogenation of nitrostyrene using Au/CoO_x-TiO₂’, The 7^th Tokyo Conference on Advanced Catalytic Science and Technology (TOCAT7), Kyoto, Japan, 1-6 June 2014.

N.R. Sasirekha, P. Sangeetha, Y.-W. Chen and K. Palanichamy ‘Nanosized Au/CeO₂ catalyst towards low temperature oxidation of CO’, International Conference on Chemistry and Materials (ICCM-2014), Tiruchirappalli, India, 14-15 November 2014.

N.R. Sasirekha and Yu Wen Chen, ‘Catalytic combustion of toluene on Pd/MnO_x-CeO₂: Effect of manganese oxide’, International Conference on Chemistry and Renewable Energy (ICCRE 2016), Bishop Heber College, Tiruchirappalli, India, 25-26 February 2016.

N.R. Sasirekha, K. Palanichamy, P. Sangeetha and Yu-Wen Chen, ‘Photocatalytic water splitting using modified In₆WO₁₂: Effect of additives and pretreatment’, International Conference on Energy Innovations – Today and Tomorrow, Hindustan Petroleum Corporation Limited Green R&D Centre, Bengaluru, 14–15 October, 2016.

N.R. Sasirekha, P. Sangeetha and Yu-Wen Chen, ‘Synergetic effect in Au–Rh/CeO₂ catalysts for preferential oxidation of CO in hydrogen-rich stream’, The Asia-Pacific Congress on Catalysis (APCAT-7), Institute of Chemical Technology, Mumbai and Catalysis Society of India, 17–21 January, 2017.

K. Palanichamy, N.R. Sasirekha and K. Shanthi, ‘Comparative study on the effect of bimetallic Pt-Ni catalyst on Ce-SBA-15 for dry reforming of methane’, The Asia-Pacific Congress on Catalysis (APCAT-7), Institute of Chemical Technology, Mumbai and Catalysis Society of India, 17–21 January, 2017.

N.R. Sasirekha, K. Palanichamy and Y.-W. Chen, ‘Bimetallic catalysts supported on CeO₂ for preferential oxidation of CO in hydrogen-rich stream’, International Conference on Advances in Biological, Chemical and Physical Sciences (ABCPS-2017), Anna University, BIT Campus, Tiruchirappalli, 13–15 March, 2017.

International Seminar on Recent Trends in Environmental Sciences – Issues and Remedies (10 March 2017), Centre for Environmental Sciences, University of Madras, Chennai, India.

India International Science Festival 2017 (13–16 October 2017), Chennai, India.

K. Palanichamy and N.R. Sasirekha, ‘Catalytic dry reforming of methane over Ni/Al-SBA-15 mesoporous materials’, International Seminar on Advanced Materials (ISAN-2018), National Centre for Nanosciences and Nanotechnology, University of Madras, Chennai, 27–28 February 2018.

K. Palanichamy and N.R. Sasirekha, ‘Nickel modified Ti-SBA-15 for catalytic dry reforming of methane’, Joint India-UK International Conference on “Advanced Nanomaterials for Energy, Environment and Healthcare Applications (ANEH-2018)”, K.S.R. College of Arts and Science for Women, Tiruchengode, Namakkal & Swansea University, United Kingdom, 31 August and 1 September 2018.

International Conference on Advancements and Challenges in Chemical Sciences 2018 (2–3 February 2018), Pachaiyappa’s College, Chennai, India.

2^nd International Conference on Recent Trends in Analytical Chemistry (15–17 March, 2018), Department of Analytical Chemistry, University of Madras, Chennai, India.

Nanobioteck – 2018, 3^rd Annual Conference of Indian Society of Nanomedicine (24–27 October, 2018), All India Institute of Medical Sciences, New Delhi.

T. Karthik, K. Palanichamy, N.R. Sasirekha and P. Rajashree, ‘Fabrication of anti-tuberculosis multifunctional mesoporous silica nanoparticle incorporated with iron oxide to target mycobacteria’, 5^th International Conference on Nanoscience and Nanotechnology, SRM Institute of Science and Technology, Kattankulanthur, Chennai, 28–30 January 2019.

K. Palanichamy and N.R. Sasirekha, ‘Synthesis, characterization and catalytic behaviour of Ni/Ti-UVM-7 mesoporous catalysts for partial oxidation of methane’, India-UK Second International Conference on Energy, Environment and Healthcare Applications (ANEH-2019), Bishop Heber College, Tiruchirappalli, 04–06 February, 2019.

India-UK Joint Hands-on Training Program for Nanomaterials Characterization and Device Fabrication (19–21 September 2019), KSR, Tiruchengode, India.

N. Manjari and N.R. Sasirekha, ‘Transesterification of jatropha oil to biodiesel using modified sepiolite’, International Conference on Emerging Trends in Catalysis (ETC 2020), VIT, Vellore, 06–08 January, 2020

N. Swetha and N.R. Sasirekha, ‘Chemoselective hydrogenation of crotonaldehyde using modified mesoporous materials’, International Conference on Emerging Trends in Catalysis (ETC 2020), VIT, Vellore, 06–08 January, 2020

International Virtual Conference on Advanced Nanomaterials Applications (VCAN 2020), Centre for Nanotechnology Research, VIT, Vellore, 17 – 19 June, 2020.

One day International Virtual Conference on Photovoltaics and Materials Science, VIT, Vellore, 23^rd June, 2020.

One day International Webinar on Photocatalysis, VIT, Chennai, 29^th June, 2020.

International Online Faculty Development Programme on Frontiers in Chemistry, St. Joseph’s College of Engineering, Chennai, 16–18 September, 2020.

K. Palanichamy and N.R. Sasirekha, ‘Hydrogen production by CO₂ reforming of CH₄ to syngas over Ni–Co/KCC-1 catalysts’, 3^rd International Conference on Sustainable Environment, Energy and Construction (ICSEEC 2021), Hindustan Institute of Technology & Science, 16–17 December, 2021

K. Palanichamy and N.R. Sasirekha, ‘Nickel impregnated UVM-7 mesoporous catalysts for carbon dioxide reforming of methane’, Catalysis Science and Technology 10^th Anniversary Symposium (On-line), Royal Society of Chemistry, United Kingdom, 16–17 November 2021.

1^st Online International Conference on Emerging Trends in Catalysis for Sustainable Chemical Processes (ETCSCP-2021), Indian Institute of Chemical Engineers – Bangalore Regional Centre and Catalysis Society of India, 26–28 August, 2021

Ganesh S., Ashitha K.C., P. Rajashree and N.R. Sasirekha, ‘Synthesis of hydroxyapatite nanomaterial using soft-templated method and its bio-medical application: Effect of surfactant and phosphate precursor’, International Conference on Recent Trends in Materials and Magnetism (RTMM-22), Department of Chemistry, Loyola College, Chennai, 15–16 December, 2022.

Ashitha K.C., Ganesh S., Bargavi P., Ramya R., S. Balakumar, N.R. Sasirekha and P. Rajashree, ‘Hydroxyapatite-based vaccine adjuvant systems: Enhancing the efficacy of potential immunotherapeutics’, International Conference on Recent Trends in Materials and Magnetism (RTMM-22), Department of Chemistry, Loyola College, Chennai, 15–16 December, 2022.