Recent Study of AC Electrical Behavior of Iron Nanoparticle Decorated Polymer Composite

According to the reviews, this study was based on current efforts and breakthroughs in customizing nano-scale structures of nanostructured conducting polymer materials to improve electrical characteristics. The purpose of this study is to look into the a.c electrical response of a PANI/FeNP/Graphene composite created in-situ with adhathodavasica plant extract in an ice-cold bath The samples were characterized using techniques such as FT-IR and SEM. AC conductivity measurements were taken at 298K using an HIOKI 3532-50 LCR Hi-tester in the frequency range 5×101–5×106 Hz. SEM images show the layered structure of graphene nanosheets in the composite. The uniform distribution of iron nanoparticles throughout the PANI matrix, as well as the frequency of imine stretching, are characteristics of IR spectral data. The investigation of a.c conductivity provides evidence for the transport properties of composites. AC conductivity values increase as graphene content in the PANI/FeNP/Graphene composites increases stepwise.

Author (s) Details

Ms. Sreeraksha
Department of Chemistry, NMKRV College for Women, Bangalore, Karnataka, India.

Ms. Navya
Department of Chemistry, NMKRV College for Women, Bangalore, Karnataka, India

Dr. K. Vinay
Department of Chemistry, Channabasaveswara Institute of Technology, Gubbi, Karnataka, India.

Dr. Y. T. Ravikiran
Department of PG Studies and Research in Physics, Govt. Science College, Chitradurga, Karnataka, India.

Dr. M. Revanasiddappa
Department of Chemistry, PES University South Campus, Bangalore, Karnataka, India.

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Studies on Removal of Toxic Cd2+ and Pb2+ from Aqueous Solutions by Using Agro-waste (Cola nitida Pod)

Industrial processes and used commercial (metallic) products generate a large amount of metallic waste, which is discharged into the environment via water or land-dumping sites. It is estimated that the toxicity of metallic discharge into the environment far outweighs the total toxicity of all radioactive and organic wastes combined. The importance of metals and their compounds in industrial operations cannot be overstated. Meanwhile, industrial effluents contain heavy metal ions that have been reported to be harmful to human and plant health when discharged untreated into the environment. As a result, removing heavy metal ions from industrial effluents prior to discharge becomes critical. The removal/adsorption of lead (II) ion and cadmium (II) ion from aqueous solution by Cola nitida pod was studied. The effects of contact time, initial metal ion concentration, initial pH, adsorbent dose, and temperature on metal ion removal were investigated for contact times ranging from 15 to 90 minutes and initial metal ion concentrations ranging from 50 to 200 mg/l. The pH range is 5-8, the adsorbent dose range is 0.1-0.7 g, and the temperature range is 303-333 K. The equilibrium time was discovered to be in the range of 60 minutes. Pb2+ and Cd2+ removal percentages from aqueous solutions pod) was discovered to be greater than 90%. Changes in initial metal ion concentration, initial pH, adsorbent dose, and temperature all had an effect on the percentage removal of lead (II) ion and cadmium (II) ion by the test adsorbent. The adsorption mechanisms of the metal ions on the test adsorbent were examined using Langmuir and Freundlich adsorption isotherms, and the adsorption of both Pb2+ and Cd2+ on Cola nitida pod fit perfectly into the adsorption isotherms. When the correlation coefficients (R2) of the linearized forms of the Langmuir and Freundlich models are compared, it is clear that the Langmuir model provides a better fit for the experimental adsorption equilibrium data and is the most appropriate. isotherm to describe the equilibrium data for lead and cadmium, and thus Langmuir adsorption is recommended for Pb2+ and Cd2+ adsorption studies. The contrast of The correlation coefficients (R2) of the linearized forms of the Langmuir and Freundlich models show that the Langmuir model fits the experimental adsorption equilibrium data better and is the most appropriate isotherm to describe the equilibrium data for lead and cadmium.

Author (S) Details

N. E. Ibisi
Department of Chemistry, College of Physical and Applied Sciences, Michael Okpara University of Agriculture Umudike, P.M.B 7267, Umuahia, Abia-State, Nigeria.

H. Ozioko
Department of Chemistry, College of Physical and Applied Sciences, Michael Okpara University of Agriculture Umudike, P.M.B 7267, Umuahia, Abia-State, Nigeria.

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Bio-applications of Bacterial Cellulose and Type ICollagen Conjugated with Resveratrol for Epithelial Defect Regeneration

Effective wound repair and regeneration require excellent wound dressing. The purpose of this chapter is to assess the efficacy of bacterial cellulose (BC) and type I collagen (COL) scaffolds conjugated with resveratrol (RSV) in wound management. BC and COL are biodegradable and renewable polymers with a strong affinity for materials containing hydroxyl groups, whereas RSV has a 4′-hydroxyl group and exhibits good biocompatibility and no cytotoxicity. The results showed that RSV was effectively released in vitro from the BC and COL scaffolds, and immunofluorescence staining revealed that both scaffolds were present. Epithelia that has been regenerated and is highly biocompatible. Furthermore, Masson’s trichrome staining revealed that both scaffolds preserved the normal collagen-bundling pattern and stimulated re-epithelialization in defective rat epidermis. These findings suggest that RSV-conjugated BC or COL scaffolds provided a biocompatible environment for stem cell attachment and growth, as well as promoting epithelial regeneration during wound healing.

Author (s) Details

Juin-Hong Cherng

Department and Graduate Institute of Biology and Anatomy, National Defense Medical Center, 114 Taipei, Taiwan, R.O.C. Department of Gerontological Health Care, National Taipei University of Nursing and Health Sciences, 112 Taipei, Taiwan, R.O.C.

Shu-Jen Chang
Division of Rheumatology/Immunology/Allergy, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, 114 Taipei, Taiwan, R.O.C.

Dewi Sartika
Laboratory of Adult Stem Cell and Tissue Regeneration, National Defense Medical Center, 114 Taipei, Taiwan, R.O.C.

Cheng-Che Liu
Department of Physiology and Biophysics, Graduate Institute of Physiology, National Defense Medical Center, 114 Taipei, Taiwan, R.O.C.

Sheng-Tang Wu
Division of Urology, Department of Surgery, Tri-Service General Hospital, National Defense Medical Center, 112 Taipei, Taiwan, R.O.C.

En Meng
Division of Urology, Department of Surgery, Tri-Service General Hospital, National Defense Medical Center, 112 Taipei, Taiwan, R.O.C.

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Enhancement of Electromagnetic Wave Shielding Effectiveness of Carbon Fiber-based Fabrics via Carbon Fiber-Carbon Microcoil Hybrid Formation or H2 Plasma Treatment

Using a thermal chemical vapor deposition system, carbon fiber-carbon microcoil (CF-CMC) hybrids were formed on carbon fiber (CF)-based fabrics. Although the CF-CMC hybridization reaction improved the shielding effectiveness (SE) values of CF-based nonwoven fabrics (c-NFs), it reduced the electrical conductivities of the nonwoven fabric. Because of the CF-CMC hybrid formation, the SE values of CF-based woven fabrics (c-WFs) were improved by more than twofold across the entire frequency range. This significant improvement was attributed in part to increased electrical conductivity, particularly in the transverse direction to the individual CFs. Because c-NFs are made up of randomly oriented carbon fibers, the SE values of c-NF samples are higher than those of c-WF samples. To improve the SE values of cNFs, H2 plasma treatment was performed. As a result, the SE values of the c-NFs improved significantly across the operating frequency range of 0.04 to 20.0 GHz. The SE values of H2 plasma-treated c-NFs samples were compared to those of c-NFs samples coated with nano-sized Ag particles. Despite the fact that it has a lower surface electrical conductivity, Across the relatively high operating frequency range of 7.0 to 20.0 GHz, H2 plasma-treated c-NFs samples exhibited significantly higher SE than Ag-coated c-NFs samples. The carbon component of H2 plasma-treated c-NFs samples increased significantly more than the oxygen component. The H2 plasma treatment converted the alcohol-type (C-O-H) compounds formed by carbon-oxygen bonds on the surface of the native c-NFs samples into ether-type (C-O-C) compounds. Based on these findings, we proposed a mechanism to explain the SE enhancement observed in H2 plasma-treated c-NFs.

Author (s) Details

Hyun-Ji Kim
Department of Energy and Chemical Engineering, Silla University, Busan 46958, Republic of Korea.

Gi-Hwan Kang
Department of Energy and Chemical Engineering, Silla University, Busan 46958, Republic of Korea.

Sung-Hoon Kim
Department of Energy and Chemical Engineering, Silla University, Busan 46958, Republic of Korea.

Sangmoon Park
Department of Energy and Chemical Engineering, Silla University, Busan 46958, Republic of Korea.

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Quantum Mechanical Calculations for Reaction Path of O-R Bond Breakage in Some of Cefpodoxime Prodrugs: A Scientific Explanation

Unrestricted Hartree Fock (UHF) quantum mechanical calculations of proton transfer and reaction path of (O-R) bond rupture energies in nine cefpodoxime prodrug derivatives of different substituted organic groups, at their optimized geometries, are presented in this work. Using the Gaussian-09 program, the geometrical structure and some physical properties such as standard heat of formation, dipole moment, and total energies were calculated. The total energies of the reactants, activation energies, transition states, and end products were compared. In the vacuum phase, all calculations are reported. According to the findings, some of the substituted organic groups can be used as carrier linkages for the acidic cefpodoxime drug. The calculations revealed that using a quantum mechanics account to evaluate whether organic groups can be substituted in drug derivatives as drug-related carrier groups and used as treatment drugs is a strong possibility.

Author (S) Details

Prof. Dr. R. M. Kubba
Department of Chemistry, College of Science, University of Baghdad, Jadiriya, Baghdad, Iraq.

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Metal Complexes in Biology and Medicine (Part – Metal (II) – α- Aminobutenoic Acid and Metal (II) – Hydroxyproline Binary Complexes)

The estimation of the stability or formation constants characterizing the equilibria corresponding to the successive addition of ligands provides a quantitative indication of a complex formation. The technique of paper ionophoresis is used to investigate equilibria in binary complex systems in solution. This method is based on the movement of a spot of metal ion in an electric field at various pH of background electrolyte. A graph of pH versus mobility was used to obtain information on the binary complexes and to calculate its stability constants. At an ionic strength of 0.1 M and 35ºC, the stability constants of ML and ML2 complex species of certain metal ions copper(II), manganese(II), and uranyl(II) with – α- Aminobutenoic acid and hydroxyproline were determined. The stability constants of ML and ML2 complex species of metal(II)-α-aminobutenoic acid and metal(II)– hydroxyproline were found to be [(7.70 ± 0.03, 6.38 ± 0.11), (3.19 ± 0.02, 2.07 ± 0.09), (7.32 ± 0.05, 5.49 ± 0.12)] and [(8.23 ± 0.05, 7.05 ± 0.03), (3.74 ± 0.06, 3.15 ± 0.09), (7.39 ± 0.11, 6.67 ± 0.02)] for copper(II), manganese(II) and uranyl(II) complexes, respectively. The electrophoretic technique described in this paper has proven to be useful in determining whether a complex system is formed or not, and if it is formed, its stability constants can also be determined.

Author (S) Details

Prof. Dr. Brij Bhushan Tewari
Department of Chemistry, Faculty of Natural Sciences, University of Guyana, P.O. Box 101110, Georgetown, Guyana.

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Greener Synthesis of O, S, N-Nitrogen-Containing Heterocycles in Water, PEG, and Bio-Based Solvents

Solvents used in chemistry play an important role in the environmental performance of processes in corporate and academic laboratories. Their impact on costs, health safety, and the environment cannot be overstated. Quantitatively, solvents are the most abundant constituents of chemical transformations; therefore, acting on solvents and replacing standard solvents with safer products can have a great ecological impact. However, not all green solvents are suitable for the wide scope of organic chemistry reactions. A second point to consider is that 50% of pharmaceutical drugs are Compounds containing nitrogen heterocycles As a result, it appeared necessary to provide an overview of the more environmentally friendly methods for synthesizing this class of compounds. All publications published since 2000 that describe green reactions leading to the formation of nitrogen heterocycles using safe solvents were considered for this review. Because of their low toxicity, we chose water, PEG, and bio-based solvents. The synthesis of five-, six-, and seven-membered aromatic nitrogen heterocycles using green reactions is described. We describe three biologically based solvents that have been reported as viable alternatives in the synthesis of N-heterocycles: meglumine, ethyl lactate and Lactic acid.

Author (S) Details

Joana F. Campos

Institute of Organic and Analytical Chemistry (ICOA), University of Orleans, UMR-CNRS 7311, BP 6759, Rue de Chartres 45067 Orleans Cedex 2, France.

Sabine Berteina-Raboin
Institute of Organic and Analytical Chemistry (ICOA), University of Orleans, UMR-CNRS 7311, BP 6759, Rue de Chartres 45067 Orleans Cedex 2, France.

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Structural Characterization and Magnetic Properties of Undoped and Ti-Doped ZnO Nanoparticles Prepared by Modified Oxalate Route: An Advance Study

Averrhoa carambola fruit juice was used as a natural source of oxalate in the preparation of ti-doped zinc oxide and pure zinc oxide nanoparticles via a modified oxalate route. FTIR, TGA, and XRD were used to investigate the properties of the precursors. The investigation revealed that the precursors are zinc oxalate and Ti-doped zinc oxalate, which readily decompose at room temperature. 450°C. The as-prepared precursors were calcined for 4 hours at 450°C, and the decomposition products were characterized using XRD, SEM, EDX, and VSM. Using the Debye-Scherrer equation, XRD results revealed crystallinity with hexagonal wurtzite structure, and the average grain size was found to be 26 nm for Ti-doped ZnO and 29 nm for ZnO. Furthermore, SEM morphological studies revealed particle agglomeration, while EDS analysis revealed the presence of Ti3+ in the zinc oxide lattice. Finally, the hysteresis loop from the VSM results demonstrates that Tidoped ZnO is ferromagnetic. The expected metal oxalates were identified as the precursors, and the decomposition products were pure ferromagnetic nanoparticles.

Author (s) Details

Ekane Peter Etape
Department of Chemistry, Faculty of Science, University of Buea, P.O.Box 63, Buea, Cameroon

Josepha Foba-Tendo
Department of Chemistry, Faculty of Science, University of Buea, P.O.Box 63, Buea, Cameroon.

Lambi John Ngolui
Department of Chemistry, ENS Yaound´e, BP 47, Yaound´e, Cameroon.

Beckley Victorine Namondo
Department of Chemistry, Faculty of Science, University of Buea, P.O.Box 63, Buea, Cameroon.

Fomogne Cyrille Yollande
Department of Chemistry, Faculty of Science, University of Buea, P.O.Box 63, Buea, Cameroon.

Marius Borel Nguefack Nguimezong
Department of Chemistry, Faculty of Science, University of Buea, P.O.Box 63, Buea, Cameroon.

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Low Level of Kerosene Adulteration in Petrol Studied by Fiber Optics

The smallest amount of kerosene in petrol can have a negative impact on the operation of a vehicle engine. This paper develops a simple, low-cost, sensitive, and miniature sensor based on a fiber optic coupler and an optoelectronic detection system. The sensor has been modeled and tested. It has been discovered that the current sensor is only capable of detecting less than 5% of kerosene adulteration in gasoline. It is capable of detecting 1% variation in adulteration. The sensor’s size is measured in micrometers.

Author (S) Details

Dr. Shilpa Kulkarni
Shri Ramdeobaba College of Engineering and Management, Katol Road, Nagpur, M.S., India.

Dr. Sujata Patrikar
Visvesvaraya National Institute of Technology, Nagpur, M.S., India.

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Isolation, Characterizations of Bioactive Principles from Melia dubia Leaf and Its In-silico and In-vitro Urolithiatic Activity

Many medicinal plants contain a wide range of bioactive compounds at various levels. The primary goal of this research is to identify and separate antioxidants from different extracts of Melia dubia leaves. Soxhlet extraction was used with solvents such as hexane, chloroform, ethyl acetate, methanol, water, and 70% ethanol. The anti-oxidant capacity of six extracts was determined using the simple and convenient DPPH method. Extracts with high scavenging activity Separation was achieved using chromatographic techniques, which were then characterized using spectral methods. In-silico and in-vitro testing were performed on compounds with the highest antioxidant efficacy to determine their inhibitory potential against Urolithiatic activity. Methanol and ethanol have antioxidant activity. The antioxidant potential of 70% ethanol extracts was higher, and two antioxidants, MDL-1 and MDL-2, were isolated and characterized. MDL-1 had a higher scavenging potential than MDL-2, and its antiurolithiatic properties were confirmed using molecular docking (Insilico) and the single diffusion gel method (In-vitro).

Author (S) Details

Dr. J. Rosaline Vimala
PG & Research Department of Chemistry, Holy Cross College (Autonomous), Tiruchirappalli, India.

Dr. G. Dayana Jeyaleela
PG & Research Department of Chemistry, Holy Cross College (Autonomous), Tiruchirappalli, India.

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