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Quadrifunctionality Variation of Aluminosilicate Silicon Nucleus on Solid State Geopolymerisation Observed by 29Si Magic Angle Spinning Nuclear Magnetic Resonance Studies

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Abstract

Solid state 29Si MAS NMR is a versatile spectroscopic technique to study anisotropic interactions of Si in geopolymeric cement systems. This article is concerned with the analysis of structural information and mechanism for evolution of tailored geopolymeric precursor powder originated after mechanical co-grinding of fly ash, NaOH and amorphous tricalcium phosphate. The solid state 29Si MAS NMR of geopolymeric precursor material shows distinguishable chemical shifts. Results indicated that developed geopolymeric precursor contain Si/Al tetrahedral network in which SiQ4(3-4Al) dominated among Q0, Q1 and Q2. The evolution of green phosphatic geopolymer cement material takes place after addition of water to developed precursor material. Results also provide an insight about -Si-O-Si- interactions in geopolymer precursor formation, due to reorganization and structural disordering, as a noteworthy greener solid state mechanism. Another eminent finding of this study is the occurrence of significant change in chemical shift values caused by grinding. These shifts are accompanied by incorporation of Al in Si-O-Si linkages and 3D crosslinking into the matrix in geopolymeric precursor material itself, leading to formation of transient Si/Al containing species following solid state mechanism.

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Acknowledgements

The authors would like to thanks Director CSIR-AMPRI for motivating the research work. Thanks are also due to Dr. Rajamohan, CSIR-National Chemical Laboratory, Pune, Maharashtra, India for providing 29Si NMR experimentation facility.

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Authors and Affiliations

  1. Academy of Scientific and Innovative Research- AcSIR- AMPRI, Bhopal, India

    Pooja Bhardwaj, Rainy Gupta & Deepti Mishra

  2. Materials for Radiation Shielding and Cement Free Concrete Division, Council of Scientific and Industrial Research, Advanced Materials and Processes Research Institute, Hoshangabad Road, Bhopal, MP, 462064, India

    Pooja Bhardwaj, Rainy Gupta, Deepti Mishra & Sudhir S. Amritphale

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  1. Pooja Bhardwaj
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  2. Rainy Gupta
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Correspondence to Pooja Bhardwaj.

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Bhardwaj, P., Gupta, R., Mishra, D. et al. Quadrifunctionality Variation of Aluminosilicate Silicon Nucleus on Solid State Geopolymerisation Observed by 29Si Magic Angle Spinning Nuclear Magnetic Resonance Studies. Silicon 11, 2127–2133 (2019). https://doi.org/10.1007/s12633-018-0032-9

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