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K. Naseema,Vijayalakshmi Rao,K.V. Sujith,Balakrishna Kalluraya 한국물리학회 2010 Current Applied Physics Vol.10 No.4
In this paper, we report the synthesis, growth and characterization of a new organic NLO single crystal of NMPMN (N0-[(Z)-(4-methylphenyl)methylidene]-4-nitrobenzohydrazide), for the first time. The single crystal was grown by slow evaporation method at room temperature. The cell dimensions obtained by single crystal XRD studies reveal that the crystal belongs to triclinic system. It was characterized by different techniques like powder XRD, UV, FTIR, TGA and DSC. The Knoop microhardness test was carried out to measure the mechanical strength of the crystal. Its refractive index was determined by the Brewster’s angle method. The laser damage threshold studies have been carried out for the crystal using a Q-switched Nd:YAG laser of ns pulses at a wavelength of 532 nm. The Kurtz Powder Second Harmonic Generation revealed that the SHG efficiency of the grown crystal is about 50% that of KDP and is found to be phase matchable. The intermolecular O-H···O, O-H···N and C-H···O hydrogen bonds and a π–π stacking interaction between the nitrobenzene and tolyl rings helps to create a delicate balance between the molecular and supramolecular charge transfer processes by creating a noncentrosymmetric structure.
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Sameena Begum,Vijayalakshmi Arelli,Gangagni Rao Anupoju,Sridhar S,Suresh K. Bhargava,Nicky Eshtiaghi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
Liquid–liquid extraction of volatile fatty acids (VFA) from landfill leachate (LL) as well as syntheticsolution (SS) whose concentration varied from 0.2 to 1 mol/L was investigated. The impact of extractantand feed VFA concentration on extraction efficiency (EE), distribution ratio (KD) and loading ratio (z) withthe help of statistical analysis and process optimization using response surface methodology ispresented. Physical extraction of VFA from SS using seven different diluents was performed to choose thebest diluent. Reactive extraction of VFA was investigated with 10–50% (v/v) trioctylamine (TOA) andtributylphosphate (TBP) as extractants in 1-Octanol. Reactive extraction of VFA results disclosedenhancement of EE due to the synergistic chemical interactions between extractant and diluent. Majorityof the acid extractant complexes formed were 1:1 with TBP while 1:1, 2:1 and 3:1 with TOA as verified byz > 0.5 The optimal extractant concentration for TOA and TBP was found to be 37.8% and 39.09% at a feedconcentration of 0.67 mol/L and 0.81 mol/L for SS respectively to achieve maximum EE of 91% while it was29.3% and 36.2% at 0.2 mol/L for LL to achieve EE of 52% and 57% correspondingly.
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