A Study on the Effects of Internal Heat Generation on the Thermal Performance of Solid and Porous Fins using Differential Transformation Method

In this study, the impacts of internal heat generation on heat transfer enhancement of porous fin is theoretical investigated using differential transform method. The parametric studies reveal that porosity enhances the finheat dissipating capacity but the internal heat generation decreases the heatenhancement capacity of extended surface. Also, it is established that whenthe internal heat parameter increases to some certain values, some negativeeffects are recorded where the fin stores heat rather than dissipating it. Thisscenario defeats the prime purpose of the cooling fin. Additionally, it is established in the present study that the limiting value of porosity parameterfor thermal stability for the passive device increases as internal heat parameter increases. This shows that although the internal heat parameter canhelp assist higher range and value of thermal stability of the fin, it producesnegative effect which greatly defeats the ultimate purpose of the fin. Theresults in the work will help in fin design for industrial applications whereinternal heat generation is involved

Synthesis and characterization of a tetranuclear Cu(II) coordination polymer containing pyridine-2,6-dicarboxylic acid and 4-amidinopyridine co-ligand

This research demonstrates the preparation of a new coordination polymer, {[Cu4(H2pydc)2(H1apy)(H2O)2DMF].DMF}n, (H2pydc = pyridine-2,6-dicarboxylic acid, H1apy = 4-amidinopyridine) under solvothermal condition by the self-assembly of pyridine-2,6-dicarboxylic acid, 4-midinopyridene and copper(II) acetate. The compound was characterized by elemental analysis and infrared spectroscopic technique. The analysis indicated that the 4-amidinopyridine coordinated to the copper ions through the terminal nitrogen in a monodentate fashion while the pyridine-2,6-dicarboxylic acids coordinated through the carboxylate oxygens in monodentate mode. Both the elemental analysis and the infrared spectroscopic data agreed with the proposed stoichiometry. This result represent the first report of a tetranuclear Cu(II) coordination polymer having coordinated 4-amidinopyridine as the nitrogen donor moiety in its structure

Synthesis and spectroscopic analysis of Schiff Bases of Imesatin and Isatin derivatives

A series of new Schiff bases of Imesatin and Isatin derivatives which have been previously prepared from the reaction of Hydrazine monohydrate, p-phenylenediamine and 4,4- diaminodiphenylmethane with Isatin were reported. The compounds were characterized by elemental analyses, UV-visible, Infrared and Nuclear Magnetic Resonance (1H NMR and 13C NMR) spectroscopic analyses. The synthesized Schiff bases were obtained in moderate to excellent yields between 55.3 – 89.3%. Infrared spectra of all synthesized compounds contain the characteristic azomethine linkage (-CH=N) between 1580 – 1630 cm-1 and the N–H of the Isatin ring signals between δ 8.32 – 10.68 ppm in their 1H NMR spectra. The present work affords reaction pathway that is efficient and operational simplicity for the synthesis of Schiff bases derivatives.Keywords: Schiff bases, isatin, imesatin, spectroscopic analysis, biological activit

Assessment of resistance status of some tomato genotypes to bacterial wilt disease and evaluation of SNP marker (LEOH19) for selection of BW resistant gene

Marker assisted selection (MAS) has become very important and useful in selection of disease resistance genes in crop plants. Tomato, Solanum lycopersicum, is one of the most important vegetables worldwide but its production is being affected by pests and diseases, one of which is bacterial wilt caused by Ralstonia solanacearum. In endemic areas, the disease constitutes up to 100% yield loss. A-Two-season completely randomized design (CRD) experimental trial was conducted to assess the resistance status of forty (40) tomato genotypes. The results showed variations in resistance status, from highly resistance to highly susceptible. DNA concentrations from the assessed genotypes ranged between 14.46 and1430.52 ng/ul. Single Nucleotide Polymorphism (SNP) marker, LEOH19, was evaluated on the forty tomato genotypes for the identification of bw-gene that confers resistance to R. solanacearum. Genomic DNA was amplified using the primer sequence; (forward primer; 5´- AAGGCTCAGAAAGGGTCCAT-3´, reverse primer; 5´- GAGTTCATCAACACATCACACA-3´). The primer pairs produced amplification at 300 bp in 35 genotypes. After digestion, the product produced 300 bp in 33 genotypes. In screenhouse study, AVTO9803, AVTO0201, Tomachiva and Eyetom were found highly resistant and could be considered good materials in grafting and breeding programme for bacterial wilt resistance development. The results indicated that the primer amplified the specific sequence of the bw-gene locus in both the resistant and susceptible alleles. LEOH19 was found to be monomorphic and produced DNA fragments in both resistant and susceptible tomato genotypes and could, therefore, not be used as a molecular marker for marker assisted selection in tomato breeding programme.Key words: Bacterial wilt, Ralstonia solanacearum, resistance, SNP, Tomato

Solvent‐free Synthesis, Characterization and Solvent‐Vapor Interaction of Zinc (II) and Copper (II) Coordination Polymers containing Nitrogen‐donor Ligands

Coordination polymers of [Zn(INA)2] (1) (INA = isonicotinate), [Cu2(mal)2(H2O)2(bipy)] (2) (mal = malonate, bipy = 4,4-bipyridine), and [Zn2(OAC)4(bipy)2] (3) (OAC = acetate) were prepared using mechanochemical grinding and heating methods. The materials were characterized with elemental analysis, FT-IR spectroscopy, TGA, SEM, EI-MS, BET, and PXRD. Comparison of PXRD patterns of the materials with patterns simulated from single-crystal X-ray diffraction data allowed identification of the products. Compared to conventional synthetic techniques such as solvothermal/hydrothermal solvent-based methods, solvent-free method was found to be simple, highly efficient, and environmentally friendly especially for the preparation of these coordination polymers on a large scale. Solvent-vapor interaction properties of 1, 2, and 3 were investigated by exposure of the compounds to water and methanol at room temperature

Removal of organic pollutant (pyrene) from aqueous solution using coordination polymer of [Cu(Pic)2(H2O)2]·H2O (CP-1) as adsorbent

CITATION: Tella, A. C., et al. 2019. Removal of organic pollutant (pyrene) from aqueous solution using coordination polymer of [Cu(Pic)2(H2O)2]·H2O (CP-1) as adsorbent. Applied Water Science, 9:159, doi:10.1007/s13201-019-1039-0.The original publication is available at https://link.springer.comENGLISH ABSTRACT: Adsorptive removal of organic pollutant (pyrene) was carried out using coordination polymer [Cu(Pic)2(H2O)2]·H2O (CP-1) (where “Pic” represents picolinic acid), which was prepared from copper acetate monohydrate and picolinic acid. The compound was characterized by spectroscopic techniques, SEM, elemental and thermal analyses and X-ray crystallographic analysis. The crystal structure of CP-1 shows a centrosymmetric triclinic space group P-1 in which a = 5.0924 (4) Å, b = 7.5172 (6) Å, c = 9.0965 (8) Å. The Cu²͘⁺ ion is seen to have an octahedral geometry, which is bonded to oxygen atoms from the picolinic acid and nitrogen atoms from the pyridine rings. Pyrene adsorption from aqueous media was studied with the prepared adsorbent (CP-1). The kinetic model was observed to be second order, and the sorption data fitted best into the Langmuir model. The absorbent, CP-1, was shown to have a 90.91 mg/g adsorption capacity (maximum) for pyrene in this study at 25 °C. Compound CP-1 can thus be presented as a potential adsorbent in the treatment of pyrene-polluted water.https://link.springer.com/article/10.1007/s13201-019-1039-0Publisher's versio