Corrosion Inhibition Studies on Low Carbon Steel in Hydrochloric Acid Medium Using o-Vanillin-Glutamine Schiff Base

G. Rexin Thusnavis,T. V. Archana,P. Palanisamy 한국부식방식학회 2022 Corrosion Science and Technology Vol.21 No.1

The o-Vanillin - Glutamine Schiff base [2-Hydroxy-3-Methoxy BenzylidineCarbomyl) -2-Butanoic Acid] was examined for low carbon steel corrosion inhibition in acid media. Weight loss studies were carried out at three different temperatures to determine the inhibition efficiency (IE). Electrochemical impedance spectroscopy revealed that the charge transfer resistance controlled the corrosion reaction and Tafel polarization indicated that the Schiff base acts as mixed mode of inhibitor. SEM images were recorded for the surface morphology of the low carbon steel surface. DFT studies revealed corrosion control mechanisms using quantum chemical parameters such as EHOMO, ELUMO, energy gap (ΔΕ), chemical Hardness (η), chemical Softness (σ), Electronegativity (χ), and the fraction of electron transferred (ΔN) , which is calculated using Gaussian software 09. The gas-phase geometry was fully optimized in the Density Functional Theory (DFT/B3LYP-6-31G (d)).The DFT results are in good agreement with the experimental results. All the results proved that the Schiff Base (2-Hydroxy-3-Metoxy BenzylidineCarbomyl) -2-Butanoic is a suitable alternative for corrosion inhibition of low carbon steel in acid media.

Super paramagnetic ZIF-67 metal organic framework nanocomposite

Archana, K.,Pillai, Nisha G.,Rhee, Kyong Yop,Asif, A. Elsevier Science Ltd 2019 Composites Part B, Engineering Vol.158 No.-

<P><B>Abstract</B></P> <P>Nanoparticle encapsulated metal-organic framework composites have attracted attention in many fields owing to the achievement of combined properties. We report a simple method for the encapsulation of magnetite nanoparticles into zeolitic imidazolate framework-67 (ZIF-67). ZIF-67 framework is prepared by using Cobalt nitrate as metal salt by hydrothermal method. The material shows functional properties of both magnetite and ZIF-67. The bonding interactions are analysed by Fourier transform infrared spectroscopy. The microstructure and morphology are characterized by powder X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Magnetic measurements are inquired by vibrating sample magnetometry and surface area studies done by Bruner-Emmett and Teller surface area analysis technique.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Super paramagnetic magnetite nanoparticle is encapsulated into the ZIF-67 framework. </LI> <LI> Resulting nanocomposite retains the super paramagnetic behaviour. </LI> <LI> Encapsulated nanocomposite retains the morphology of ZIF 67. </LI> <LI> Thermal stability of the nanocomposite has been improved significantly compared to magnetite nanoparticle alone. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>TEM image of magnetite encapsulated ZIF-67 framework shows the incorporation of magnetite nanoparticles into the surface cavities.</P> <P>[DISPLAY OMISSION]</P>

In vitro antiproliferative study of curcumin loaded nano zeolitic imidazolate framework hybrid biomaterials on HeLa cells

Nisha G. Pillai,Archana K,이경엽,박수진,Asif A 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-

Curcumin is a bioactive molecule having potential applications in medicalfield. Present study focuses tosynthesise the hybrid biomaterials of curcumin loaded nano zeolitic imidazolate frameworks of zinc andcobalt metals by solvothermal method. Influence of curcumin on surface morphology and thermalproperties of the hybrid biomaterials have been investigated. The framework hybrids are characterised byFTIR, XRD, SEM, TEM, BET surface area and TGA. The studies reveal that the hybrid biomaterials show highthermal stability with well identified morphology, decrease in particle size and large pore volume. Invitro antiproliferative studies corroborate that hybrid biomaterial displays greater cell growth inhibitoryperformance than that of pure metal organic framework and pure curcumin towards HeLa cells. In vitrocytotoxicity studies reveal that CCM–ZIF-67 hybrid biomaterial exhibits more specificity towardscancerous cells.

Magnetic fields in multiple bright-rimmed clouds in different directions of H ii region IC 1396

Soam, Archana,Maheswar, G,Lee, Chang Won,Neha, S,Kim, Kee-Tae Oxford University Press 2018 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.476 No.4

Ex-situ Conservation of Indigenous, Threatened and Ethno-Medicinal Diversity of Forest Species

O.P. Chaubey,Archana Sharma,G. Krishnamurthy 보안공학연구지원센터 2015 International Journal of Bio-Science and Bio-Techn Vol.7 No.3

Madhya Pradesh is rich in plant wealth and endemic flora. As a part of conservation programme, institute has established an arboretum-cum-botanic garden in 1976, covering an area of 7.34 ha. The garden complex includes various sections situated in the campus and nursery. The main forest botanic garden is situated in 4.25 ha area and houses a wide array of forest flora including trees, shrubs, climbers and herbal plant species in various sections. Of the total species planted, over 50% were threatened and ascribed with conservation value. The garden was of scientific and educational utility. The institute provides diploma and degree courses in collaboration with Universities and colleges. The institute forest botanic garden has been registered under the network of Indian Botanic Gardens in 2005. It was one among the 140 Botanic gardens of India registered by Botanic Garden Conservation International under BGCI-Investing in Nature-India programme. Detailed online information was available on the IBGN website (http//www.ibgn.org). SFRI-BG is unique in terms of its scientific arrangement of plants. The species wise conservation status and uses pertaining to ethnic, medicinal and economic importance were described here.

Plant Diversity, Edaphic Status and Population Structure in Different Forest Types of Madhya Pradesh and Chhattisgarh States in India

O.P. Chaubey,Archana Sharma,G. Krishnamurthy 보안공학연구지원센터 2015 International Journal of Bio-Science and Bio-Techn Vol.7 No.2

The present paper deals with the plant diversity, physico-chemical status of soil and population structure in different forest types/sub types of Madhya Pradesh and Chhattisgarh. The paper described the dominant and co-dominant status of tree, herbs, shrubs, climbers, and grasses species along with density, basal area, and population structure and biodiversity index in different forest types / sub types. Differences in the species composition from site to site could be attributed to climate change. The population structure in different forest types/sub types followed three categories viz; Greater proportion of individuals in the lower girth classes in forest types; Gap phase type, having absence of individuals in certain girth classes in forest type; More individuals in sapling stage and absence in higher classes in a forest type. There is a need to develop climate resilient forest management towards balancing the population structure of different species in different forest types / sub types for increasing the forest productivity.

Effect of Transgenic Rhizobacteria Overexpressing Citrobacter braakii appA on Phytate-P Availability to Mung Bean Plants

( Patel,Kuldeep J. ),( Saurabh Vig ),( G. Nareshkumar ),( G. Archana ) 한국미생물 · 생명공학회 2010 Journal of microbiology and biotechnology Vol.20 No.11

Rhizosphere microorganisms possessing phytase activity are considered important for rendering phytate-phosphorus (P) available to plants. In the present study, the Citrobacter braakii phytase gene (appA) was overexpressed in rhizobacteria possessing plant growth promoting (PGP) traits, for increasing their potential as bioinoculants. AppA was cloned under the lac promoter in the broadhost- range expression vector pBBR1MCS-2. Transformation of the recombinant construct pCBappA resulted in high constitutive phytase activity in all of the eight rhizobacterial strains belonging to genera Pantoea, Citrobacter, Enterobacter, Pseudomonas (two strains), Rhizobium (two strains), and Ensifer that were studied. Transgenic rhizobacterial strains were found to display varying levels of phytase activity, ranging from 10-folds to 538-folds higher than the corresponding control strains. The transgenic derivative of Pseudomonas fluorescens CHA0, a well-characterized plant growth promoting rhizobacterium, showed the highest expression of phytase (~8 U/mg) activity in crude extracts. Although all transformants showed high phytase activity, rhizobacteria having the ability to secrete organic acid showed significantly higher release of P from Caphytate in buffered minimal media. AppA overexpressing rhizobacteria showed increased P content, and dry weight (shoot) or shoot/ root ratio of mung bean (Vigna radiata) plants, to different extents, when grown in semisolid agar (SSA) medium containing Na-phytate or Ca-phytate as the P sources. This is the first report of the overexpression of phytase in rhizobacterial strains and its exploitation for plant growth enhancement.