Corrosion Protection of Copper in 3% NaCl Solution by the Fabrication of Thiadiazole Monolayer.

In this study, 2-mercapto-1,3,4-thiadiazole (2-MT) self-assembled monolayer (SAM) was formed on copper electrode surface and the resulting 2-MT SAM on copper has been characterized using surface analytical techniques such as Fourier transform infrared (FT-IR) spectroscopy, energy dispersive X-ray (EDX) analysis, atomic force microscopy (AFM) and contact angle measurement (CA). The existence of N and S in the EDX and FT-IR analysis showed that 2-MT molecules were self-assembled on the copper through N and S by chemisorption which indicates the formation of 2-MT SAM on copper surface. Corrosion protection performance of 2-MT SAM on copper was investigated using potentiodynamic polarization studies (PDS), cyclic voltammetry (CV) and scanning electron microscopy (SEM), respectively.

New insight of hybrid membrane to degrade Congo red and Reactive yellow under sunlight.

A study was carried out to investigate the degradation of organic contaminants (Congo red and Reactive yellow - 105) using cellulose acetate - polystyrene (CA-PS) membrane with and without ZnO impregnation. Scanning electron microscope (SEM), electron dispersive analysis of X-rays (EDAX), Fourier transform infrared spectrometer (FTIR), atomic force microscope (AFM) and thermogravimeric analysis (TG-DTA) analysis were carried out to characterize bare and ZnO impregnated CA-PS membranes. Membrane efficiency was also tested for pure water flux and antifouling performance.

Controllability of fractional higher order stochastic integrodifferential systems with fractional Brownian motion.

This paper presents a new set of sufficient conditions for controllability of fractional higher order stochastic integrodifferential systems with fractional Brownian motion (fBm) in finite dimensional space using fractional calculus, fixed point technique and stochastic analysis approach. In particular, we discuss the complete controllability for nonlinear fractional stochastic integrodifferential systems under the proved result of the corresponding linear fractional system is controllable. Finally, an example is presented to illustrate the efficiency of the obtained theoretical results.

Green synthesis, characterization and catalytic degradation studies of gold nanoparticles against congo red and methyl orange.

The present study reports, novel and greener method for synthesis of gold nanoparticles (AuNPs) using 5,7-dihydroxy-6-metoxy-3,4methylenedioxyisoflavone (Dalspinin), isolated from the roots of Dalbergia coromandeliana was carried out for the first time. The synthesized gold nanoparticles were characterized by UV-Vis spectroscopy, high resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The observed surface plasmon resonance (SPR) at 532nm in the UV-Vis absorption spectrum indicates the formation of gold nanoparticles.

Global asymptotic stability of complex-valued neural networks with additive time-varying delays.

In this paper, we extensively study the global asymptotic stability problem of complex-valued neural networks with leakage delay and additive time-varying delays. By constructing a suitable Lyapunov-Krasovskii functional and applying newly developed complex valued integral inequalities, sufficient conditions for the global asymptotic stability of proposed neural networks are established in the form of complex-valued linear matrix inequalities. This linear matrix inequalities are efficiently solved by using standard available numerical packages.

Biological activities of curcuminoids, other biomolecules from turmeric and their derivatives - A review.

In recent years, several drugs have been developed deriving from traditional products and current drug research is actively investigating the possible therapeutic roles of many Ayruvedic and Traditional Indian medicinal therapies. Among those being investigated is Turmeric. Its most important active ingredient is curcuminoids.

One pot synthesis of chitosan grafted quaternized resin for the removal of nitrate and phosphate from aqueous solution.

The present study deals with the synthesis of chitosan quaternized resin for efficient removal of nitrate and phosphate from aqueous solution. The resin was characterized with FTIR, SEM with EDX and XRD. Batch method was carried out to optimize various parameters such as contact time, initial concentration of nitrate and phosphate, dosage, pH, co-anions and temperature on the adsorption capacity of the adsorbent.

Photo-reduction of Cr(VI) using chitosan supported zinc oxide materials.

Investigations were made in order to evaluate the photocatalytic reduction of hexavalent chromium (Cr(VI)) using zinc oxide (ZnO), zinc oxide impregnated chitosan beads (ZCB) and chitosan/zinc oxide composite (CZC) under UV light irradiation. The as-synthesized chitosan modified zinc oxide materials were characterized using FTIR, SEM, EDAX and EPR studies. Photocatalytic experiments were conducted to optimize various parameters viz.

Synthesis and characterization of chitosan/Mg-Al layered double hydroxide composite for the removal of oil particles from oil-in-water emulsion.

The recovery of oil from oil-in-water emulsion has been investigated using chitosan/magnesium-aluminium layered double hydroxide hybrid composite (CS-LDHCs) by a single co-precipitation method. Resulting better adsorption efficiency of CS-LDHCs could be observed, indicating the synthesized material was effective to adsorb oil particles from oil-in-water emulsion at acidic pH (pH 3.0) than as-prepared LDH and raw chitosan.

Purification of Antilisterial Peptide (Subtilosin A) from Novel FR9 and Demonstrate Their Pathogen Invasion Protection Ability Using Human Carcinoma Cell Line.

This study focuses on isolation, screening, and characterization of novel probiotics from gastrointestinal tract of free-range chicken (). Fifty seven colonies were isolated and three isolates (FR4, FR9, and FR12) were selected and identified as FR4, FR9, and FR12 by 16S rRNA sequencing. Three strains were able to survive in stimulated acidic and bile conditions and inhibit the growth of pathogens.

Physiochemical and biological characterization of novel exopolysaccharide produced by Bacillus tequilensis FR9 isolated from chicken.

Hetero-exopolysaccharide secreted by Bacillus tequilensis FR9 (BtqEPS), was produced and fractioned on DEAE-Sepharose and phenyl sepharose CL-6B column. HPLC analysis revealed the existence of five monosaccharides including glucose, galactose, mannose, arabinose and xylose. FT-IR spectroscopy confirmed the presence of carboxyl and hydroxyl groups.

Corrosion inhibition of aminated hydroxyl ethyl cellulose on mild steel in acidic condition.

Aminated hydroxyethyl cellulose (AHEC) was synthesized, characterized using Fourier Transform Infrared spectroscopy (FTIR) and the corrosion inhibition of AHEC on mild steel in 1M HCl was studied using chemical and electrochemical studies. Results obtained in weight loss method showed that inhibition efficiency increased with increase in concentration of AHEC. The adsorption of the inhibitor on metal surface followed Frumkin isotherm.

Defluoridation of water by Tea-bag model using La(3+) modified synthetic resin@chitosan biocomposite.

The aim of this work is to gain a better understanding of the formation of lanthanum complex onto iminodiacetic acid and chitosan (CS@La-IDAMP) composite for effective removal of fluoride from aqueous solution using a tea-bag model for the first time. The surface textural and chemical properties of the synthesized composites were characterized by FTIR, SEM with EDAX and mapping images. The experimental data revealed that the fluoride adsorption was rapid, maximum fluoride removal could be removed within 12min contact time at neutral pH in room temperature under batch equilibrium model.

Enhancement of oil recovery using zirconium-chitosan hybrid composite by adsorptive method.

Recovery of oil from oil-in-water emulsion has been investigated by many scientists and it continues to be a challenging task for environmental scientists so far. Among all the techniques, adsorption is found to be an appropriate process for the removal of oil from oil-in-water emulsion owing to its high efficiency and easy operation. A hybrid material, zirconium-chitosan composite (Zr-CS-HC) was prepared to remove the oil from oil-in-water emulsion and oil was measured by extractive gravimetric method.

Defluoridation of water using dicarboxylic acids mediated chitosan-polyaniline/zirconium biopolymeric complex.

The present investigation describes the preparation of hydrogen bonded chitosan-polyaniline/zirconium biopolymeric matrix by grafting method under dicarboxylic acid medium for the removal of fluoride, first time. Herein, the dicarboxylic acids, oxalic acid, malonic acid, succinic acid were used as medium. The synthesized complex was characterized by usual analytical techniques like FTIR, XRD, SEM and EDAX analysis.

Interactions at the mild steel acid solution interface in the presence of O-fumaryl-chitosan: Electrochemical and surface studies.

The performance of synthesised O-fumaryl-chitosan (OFC) as corrosion inhibitor for mild steel in 1M HCl has been evaluated through various studies. The initial screening by weight loss method revealed the good inhibition efficiency by the inhibitor. Thermodynamic and kinetic parameters have been calculated and discussed.

A dendrimer-like hyper branched chitosan beads toward fluoride adsorption from water.

The present study reports a novel approach for the preparation of polyamidoamine grafted chitosan beads (PAAGCB) via Michael addition followed by protonation of PAAGCB to get protonated PAAGCB (H(+)-PAAGCB). Various metal ions viz., Al(3+), Ce(3+), La(3+) and Zr(4+) have been loaded onto the PAAGCB in order to get respective Al-PAAGCB, Ce-PAAGCB, La-PAAGCB and Zr-PAAGCB.

Corrosion mitigation of N-(2-hydroxy-3-trimethyl ammonium)propyl chitosan chloride as inhibitor on mild steel.

The biopolymer N-(2-hydroxy-3-trimethyl ammonium)propyl chitosan chloride (HTACC) was synthesised and its influence as a novel corrosion inhibitor on mild steel in 1M HCl was studied using gravimetric and electrochemical experiments. The compound obtained was characterised using FTIR and NMR studies. The inhibition efficiency increased with the increase in concentration and reached a maximum of 98.

Bioavailability of calcium and its absorption inhibitors in raw and cooked green leafy vegetables commonly consumed in India--an in vitro study.

The objectives of this research were to assess the bioavailability of calcium using equilibrium dialysis after simulated gastric digestion method in 20 commonly consumed green leafy vegetables (GLVs) from the typical Indian diet, provide data on the content of calcium absorption inhibitors, like oxalate, phytate, tannin and dietary fibres, and evaluate the inhibitory effect of these compounds on calcium bioavailability in raw and cooked GLVs. Cooking did not affect significantly calcium bioavailability in any GLVs. Sesbania grandiflora had a very high content of total oxalates, tannins and dietary fibers, which reduced calcium bioavailability.

Photocatalytic aptitude of titanium dioxide impregnated chitosan beads for the reduction of Cr(VI).

This article describes the photo-reduction of heavy metal Cr(VI) in aqueous solution using titanium dioxide impregnated chitosan beads (TCB) in the presence of UV irradiation. The synergistic role of TCB results in excellent photocatalytic behavior. The reduction of Cr(VI) by the TCB is mainly due to adsorption coupled photocatalytic reduction mechanism.

Photo-decolorization and detoxification of toxic dyes using titanium dioxide impregnated chitosan beads.

The removal of three different dyes namely Reactive Red 2 (RR), Methylene Blue (MB) and Rhodamine B (RB) using titanium dioxide impregnated chitosan beads (TCB) by photocatalytic method has been studied. The TCB was characterized by Fourier transform Infrared (FTIR) Spectral studies and Scanning Electron Microscope (SEM), Energy Dispersive Analysis of X-ray (EDAX). The photocatalytic activity of TCB for the decolorization of the three dyes is much higher than that of bare titanium dioxide, which can be attributed to the synergistic effect of TiO2 and chitosan.

Defluoridation of water using chitosan assisted ethylenediamine functionalized synthetic polymeric blends.

In this paper, a new kind of approach undertakes for the synthesis of novel chitosan (CS) blended with ethylenediamine (ED) functionalized synthetic polymers viz., acrylonitrile/divinylbenzene/vinylbenzyl chloride (CS@AN/DVB/VBC-ED) and styrene/divinylbenzene/vinylbenzyl chloride (CS@ST/DVB/VBC-ED) for defluoridation of water. Under batch mode, various influencing parameters like shaking time, pH, competitor ions and temperature were optimized.

Recovery of oil from oil-in-water emulsion using biopolymers by adsorptive method.

In the present study, it is aimed to identify, a low cost sorbent for the recovery of oil from oil-in-water emulsion using biopolymers such as chitin and chitosan. Chitin has the greater adsorption capacity than chitosan due to its hydrophobic nature. The characterizations of chitin and chitosan were done using FTIR, SEM, EDAX, XRD, TGA and DSC techniques.

Zr(IV) loaded cross-linked chitosan beads with enhanced surface area for the removal of nitrate and phosphate.

In this work, a new method namely silica dissolution method, has been adapted to increase the surface area of the cross-linked chitosan beads. Zr(IV) was loaded in the cross-linked chitosan beads in order to make it selective for the nitrate and phosphate anions from aqueous solutions. Zr(IV) loaded cross-linked chitosan beads prepared by normal method (ZrCB) and silica dissolution method (SD-ZrCB) were characterised using N2 adsorption/desorption studies, SEM, EDAX, XRD, FTIR, TGA, DTA and water regain property.