Vol. 7 & Issue 3 ; Section A : Chemical Sciences

Date : May 2017 to July 2017

 

The relation between van der Waals parameters a, b and a simpler calculation formula of molecule potential energy

Zhuxin Wu

JCBPS; Section A; May 2017 – July, 2017, Vol. 7, No. 3; 501-509.

[DOI: https://doi.org/10.24214/jcbps.A.7.3.50109]

  • Abstract

    In this paper, the writer derived a formula  T= 8a/27Rb from the isotherms of van der Waals formula which could be used in van der Waals formula.From the formula of a and b, the formula of the depth of molecular potential well was deduced Φ0 = 27/8 . k T which showed the depth of molecular potential well was only relative and proportional to the temperature. By analysis on this formula the writer deduced a relation V =  - 27/8 kT (r0/R)6 that was an easier formula to calculate molecule potential energy between two same molecules. By considering this formula and London dispersion formula, the author did a test on the correctness of formula V =  - 27/8 kT (r0/R)6, and the test showed the formula was correct and accurate which also showed the correctness of other new formulas in this paper.

Nanomaterial and their applications in Environmental sample preparation techniques: A Review

Abiyot Kelecha Geletu

JCBPS; Section A; May 2017 – July, 2017, Vol. 7, No. 3; 510-524.

[DOI: https:/doi.org/10.24214/jcbps.A.7.3.51024]

  • Abstract

    In this paper the use of both carbon based and metallic nano particles in separation and extraction of environmental samples, method of synthesis and modification is reviewed. Their use in preparation procedures for sample clean-up and preconcentration of analytes is a topic of growing interest in analytical chemistry. The properties of nanomaterials have been extensively exploited in different separation and enrichment techniques (e.g., SPE, microextraction and filtration). Nanomaterials can be used in different formats as single particles, aggregates, or powders or dispersed in a matrix. The aim of this paper is to present the recent application of nanomaterials in sample preparation procedure for sample clean-up and preconcentration of the analytes, which allow simplification of the method and the possibility of treating small amounts of sample.

Synthesis of novel pyridine linked to benzimidazole via sulphide and their Antioxident and Antimicrobial activity

Sathish Byrappa1, K.R.Mahendra, B. Ashwini, Puttananjaiah Shilpa, K. M. Lokanatha Rai

JCBPS; Section A; May 2017 – July, 2017, Vol. 7, No. 3; 525-535.

[DOI: https: //doi.org/10.24214/jcbps.A.7.3.52535]

  • Abstract

    In this communication, we synthesized a series of eleven novel 2-(2-(1H-benzo[d]imidazol-2-ylthio) ethyl)-3-methyl-4 H-pyrido [1,2-a] pyrimidin-4-one analogues, characterized using various spectroscopic techniques and evaluated for their antioxidant and antimicrobial activities. Among the tested compounds, compound 8d and 9 shows good antioxidant activity and compound 8d shows excellent antibacterial activity.