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Articles by N. Iswarya
Total Records ( 2 ) for N. Iswarya
  N. Iswarya , M.G. Kumar , K.S. Rajan and R.J.B. Balaguru
  Metal Organic Frameworks (MOF) are three dimensional organic-inorganic hybrid crystalline materials where a metal containing inorganic cluster is coordinated to a polydentate organic ligand. MOF-5 consists of Zn4O inorganic moiety, that acts as secondary building unit, coordinating to benzene 1,4-dicarboxylate, a bidentate ligand that acts as spacers, to form a three dimensional structure. We report the synthesis of MOF-5 using zinc nitrate and terephthalic acid as precursors dissolved in dimethyl formamide. The synthesized MOF-5 has been characterized using Fourier Transform Infrared Spectroscopy, X-ray diffractometry, Thermal analysis, Scanning Electron Microscopy and Transmission Electron Microscopy. Surface morphology reveals well-ordered structures with large number of pores in meso-scale. Adsorption capability towards vapours and gases has been studied using ethanol and CO2 as the model vapours using a chemi-resistive approach. Present results indicate that MOF-5 is a promising candidate for CO2 sequestration and gas storage.
  N. Iswarya , M. Ganesh Kumar , K.S. Rajan and John Bosco Balaguru Rayappan
  Metal Organic Framework-5 (MOF-5) can be used for sensing of Volatile Organic Compounds (VOCs). VOCs are emitted from biological sources, paints, coatings, etc. and they pollute the environment thus posing serious health and environmental hazards. MOF-5 is a three dimensional crystalline coordination compound made up of Zn4O inorganic group as the vertex and benzene decarboxylate organic group as the spacer in the unit cell of the crystal. This study reported the synthesis and characterization of MOF-5 and its capability towards sensing of VOCs like ethanol, formaldehyde and acetone. Transmission Electron Micrograph reveals that the synthesized sample is highly crystalline and porous. BET surface area obtained was found to be 230 m2 g-1. MOF-5 was made into pellets of thickness around 3 mm for sensing purposes. The material was found to be sensitive towards ethanol even at concentrations as low as 5 ppm, towards formaldehyde at higher concentrations and towards acetone at concentrations as low as 10 ppm. The order of increase in sensitivity is ethanol>formaldehyde>acetone.
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