scholarly journals Self-cured polymers from non-drying oil

2008 ◽  
Vol 2 (4) ◽  
pp. 285-293
Author(s):  
Fahmina Zafar ◽  
◽  
Syed Marghoob Ashraf ◽  
Sharif Ahmad ◽  
◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Phthalic Anhydride ◽  
Chemical Corrosion ◽  
Spectral Techniques ◽  
Drying Oil ◽  
Minor Addition ◽  
Pongamia Glabra ◽  
Physico Chemical ◽  
Ft Ir ◽  
A Minor

Pongamia glabra seed oil (PGSO) – a non-edible, non-drying oil; a sustainable resource has found application as alkyds, epoxies and polyesteramides in paints and coatings. Generally, PGSO based polymeric coatings are obtained by curing at elevated temperature. Efforts have been made to cure PGSO at room temperature by simple route modification. Self-cured Pongamia glabra oil based on polyesteramide (APGPEA) resin was synthesized by the reaction between Pongamia glabra oil modified fatty amide diol (HEPGA) with polystyrene co-maleic anhydride (SMA). After complete synthesis of APGPEA, phthalic anhydride modified polyesteramide (APGPEAPh) was synthesized in situ by a minor addition of phthalic anhydride (PA) to APGPEA in order to improve the performance of the latter. The effect of the SMA and PA introduction on properties of PGPEAPh film was also investigated. The physico-chemical characteristics of both resins were obtained by standard laboratory methods. The structural elucidation of these resins was carried out by FT-IR, 1H-NMR and 13C-NMR spectral techniques. The thermal behavior was studied by TGA. Curing was studied by DSC and FT-IR techniques. It was observed that APGPEA and APGPEAPh resins significantly improve the drying property in contrast to the previously reported polyesteramides cured at high temperature. Physico-mechanical and chemical/corrosion resistance tests of APGPEAPh coatings showed that the presence of phthalic anhydride in APGPEA enhanced the physico-mechanical and corrosion resistance considerably. The APGPEAPh resin appears to be sustainable aspirant biomaterials for anticorrosive surface coatings which may substitute polymers obtained from petroleum, potentially scarce resource.

Crystal Growth, Spectral, Thermal and Optical Properties of Phthalic Anhydride (PA) Single Crystal

2012 ◽  
Vol 584 ◽  
pp. 136-140 ◽  
Author(s):  
S. Janarthanan ◽  
Y.C. Rajan ◽  
R. Sugaraj Samuel ◽  
S. Pandi
Keyword(s):  
Spectral Analysis ◽  
Single Crystal ◽  
Phthalic Anhydride ◽  
Second Harmonic ◽  
Organic Crystals ◽  
X Ray Diffraction ◽  
Fundamental Wavelength ◽  
Ft Ir ◽  
Raman Spectral ◽  
Raman Spectral Analysis

ABSTRACT Organic single crystal of Phthalic Anhydride (PA) was successfully grown by slow evaporation method. The structure of the grown crystal was confirmed by X-ray diffraction analysis. FT-IR, and FT-Raman spectral analysis of the crystalline samples reveal that the crystalline sample consists of all functional groups. The placement of protons was identified from H1-NMR spectral analysis. UV-Visible and photoluminescence spectral analyses were carried out for the grown crystals. The thermal behavior was studied with TGA-DTA analyses. The existence of second harmonic generation (SHG) signal was observed using Nd:YAG laser with a fundamental wavelength of 1064 nm. Keywords: Organic crystals, NLO crystals

scholarly journals Prokaryotic Communities in the Thalassohaline Tuz Lake, Deep Zone, and Kayacik, Kaldirim and Yavsan Salterns (Turkey) Assessed by 16S rRNA Amplicon Sequencing

2021 ◽  
Vol 9 (7) ◽  
pp. 1525
Author(s):  
Can Akpolat ◽  
Ana Beatriz Fernández ◽  
Pinar Caglayan ◽  
Baris Calli ◽  
Meral Birbir ◽  
...  
Keyword(s):  
16S Rrna ◽  
Salt Lake ◽  
Amplicon Sequencing ◽  
Deep Zone ◽  
Biotechnological Potential ◽  
16S Rrna Amplicon Sequencing ◽  
Physico Chemical ◽  
Potential Applications ◽  
A Minor ◽  
Tuz Lake

Prokaryotic communities and physico-chemical characteristics of 30 brine samples from the thalassohaline Tuz Lake (Salt Lake), Deep Zone, Kayacik, Kaldirim, and Yavsan salterns (Turkey) were analyzed using 16S rRNA amplicon sequencing and standard methods, respectively. Archaea (98.41% of reads) was found to dominate in these habitats in contrast to the domain Bacteria (1.38% of reads). Representatives of the phylum Euryarchaeota were detected as the most predominant, while 59.48% and 1.32% of reads, respectively, were assigned to 18 archaeal genera, 19 bacterial genera, 10 archaeal genera, and one bacterial genus that were determined to be present, with more than 1% sequences in the samples. They were the archaeal genera Haloquadratum, Haloarcula, Halorhabdus, Natronomonas, Halosimplex, Halomicrobium, Halorubrum, Halonotius, Halolamina, Halobacterium, and Salinibacter within the domain Bacteria. The genera Haloquadratum and Halorhabdus were found in all sampling sites. While Haloquadratum, Haloarcula, and Halorhabdus were the most abundant genera, two uncultured Tuz Lake Halobacteria (TLHs) 1 and 2 were detected in high abundance, and an additional uncultured haloarchaeal TLH-3 was found as a minor abundant uncultured taxon. Their future isolation in pure culture would permit us to expand our knowledge on hypersaline thalassohaline habitats, as well as their ecological role and biomedical and biotechnological potential applications.

Elevated sea-water temperature and solar UV-B flux associated with two successive coral mass bleaching events in Tahiti

1995 ◽  
Vol 46 (8) ◽  
pp. 1153 ◽  
Author(s):  
JH Drollet ◽  
M Faucon ◽  
PMV Martin
Keyword(s):  
Water Temperature ◽  
Coral Bleaching ◽  
Sea Water ◽  
Bleaching Event ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Long Line ◽  
Solar Uv ◽  
Line Transects ◽  
A Minor

After a minor coral bleaching event in 1993, a more dramatic episode occurred in Tahiti from March to July 1994. Coral bleaching was recorded along four continuous 25-m-long line transects. Physico-chemical parameters of the sea water (temperature, salinity, dissolved oxygen and pH) were noted once a week, and solar UV-B flux was recorded daily before and during the bleaching episode. Results emphasized the importance of the taxonomic position of coral in susceptibility to bleaching. The evolution of bleaching through time was related to mean daily solar UV-B flux and sea-water temperature. Moreover, comparison of the 1993 and 1994 data suggested temperature and/or UV-B thresholds that may elicit minor or severe bleaching events.

scholarly journals SYNTHESIS, CHARACTERIZATION, DNA BINDING AND ANTIBACTERIAL ACTIVITY OF RUTHENIUM(III) COMPLEX CONTAINING MIXED LIGANDS

2015 ◽  
Vol 2 (1) ◽  
pp. 24-28
Author(s):  
Sampath K ◽  
Jayabalakrishnan C
Keyword(s):  
Antibacterial Activity ◽  
Dna Binding ◽  
Structural Features ◽  
Inhibition Activity ◽  
Spectral Techniques ◽  
Mixed Ligands ◽  
Physico Chemical ◽  
Pharmacological Significance ◽  
Growth Inhibition Activity ◽  
Significant Growth Inhibition

Ruthenium(III) complex, [RuBr2(AsPh3)2L] (where L = (E)-2-(2-chlorobenzylidene)-Nmethylhydrazinecarbothioamide) have been synthesized. Structural features of the complex were determined by various physico-chemical and spectral techniques. DNA binding of the complex was investigated by absorption spectroscopy which indicated that the complex bind to DNA via intercalation and this complex ind strongly than ligand. The complex has shown significant growth inhibition activity against a panel of bacteria which indicating the pharmacological significance of the ruthenium(III) complex.

scholarly journals Gelatin Extraction and Characterization from Femur Bones of Bovine and Porcine with Acid Process

2021 ◽  
Vol 6 (1) ◽  
pp. 32-41
Author(s):  
Purwantiningsih Sugita ◽  
Muhamad Rifai ◽  
Laksmi Ambarsari ◽  
Dyah Utami Cahyaning Rahayu ◽  
Hanhan Dianhar
Keyword(s):  
Amino Acid ◽  
Acid Hydrolysis ◽  
Food Industry ◽  
Physico Chemical ◽  
Halal Food ◽  
Ft Ir ◽  
Acid Process ◽  
Chemical Characters ◽  
Bovine Gelatin ◽  
Hcl Solution

Gelatin has been widely used as an additive in food industry pharmaceutical, and  cosmetic. The similar physical appearance between bovine and porcine gelatin causes an issue for some communities like a Muslim due to awareness of halal food. This study aims to produce gelatin from femur bones of bovines with acid hydrolysis and their characteristics compared to standard gelatin of bovine and porcine. Bovine and porcine bones were soaked in 5% HCl for 10 days and every 2 days a HCl solution was replaced to get ossein. Ossein is hydrolyzed by gradual heating at 65, 75, and 85oC. Gelatin  confirmed by  the physico-chemical characters, FT-IR and analysis amino acid with HPLC.The results showed that the yield of bovine gelatin was 4.33%. The physico-chemical characters of bovine gelatin resulting from isolation and bovine gelatin standards are in conformity with porcine gelatin standards and meet the requirements of SNI 06-3735-1995 and GMIA. Therefore, bovine gelatin is specifically capable of substituting porcine gelatin for application in the pharmaceutical field. The FTIR spectrum of bovine gelatin shows the presence of amide A, amide I, amide II and amide III groups. The amino acid characters of gelatin were identified as glycine (13.57%) and proline (1.62%) for bovine gelatin and glycine (0.51%) and proline (0.09%) for porcine gelatin.

scholarly journals Synthesis and Characterization of Cobalt(III) and Copper(II) Complexes of 2-((E)-(6-Fluorobenzo[d]thiazol-2-ylimino) methyl)-4-chlorophenol: DNA Binding and Nuclease Studies—SOD and Antimicrobial Activities

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
K. Savithri ◽  
B. C. Vasantha Kumar ◽  
H. K. Vivek ◽  
H. D. Revanasiddappa
Keyword(s):  
Metal Complexes ◽  
Antimicrobial Activities ◽  
Spectroscopic Studies ◽  
Docking Studies ◽  
Bacterial Strains ◽  
Spectral Techniques ◽  
Light Reduction ◽  
Drug Candidates ◽  
Ft Ir

A bidentate (N- and O-) imine-based ligand (L1) and its metal complexes of types [CuII(L1)2] (C1), [CuII(L1)(Phen)] (C2), [CoIII(L1)2] (C3), and [CoIII(L1)(Phen)] (C4) (L1 = 2-((E)-(6-fluorobenzo[d]thiazol-2-ylimino)methyl)-4-chlorophenol and phen = 1,10-phenanthroline) were synthesized as potential chemotherapeutic drug candidates. The prepared complexes were structurally characterized by spectral techniques (NMR, FT-IR, LC-MS, EPR, and electronic absorption), thermogravimetric analysis (TGA/DTA), magnetic moment, and CHNO elemental analysis. Spectroscopic studies suggested the distorted octahedral structure for all complexes. In vitro bioassay studies include binding and nuclease activities of the ligand and its complexes with target calf thymus- (CT-) DNA were carried out by employing UV-Vis, fluorescence spectroscopy, viscosity, and gel electrophoresis techniques. The extent of binding propensity was determined quantitatively by Kb and Ksv values which revealed a higher binding affinity for C2 and C4 as compared to C1 and C3. In addition, the scavenging superoxide anion free radical (O∙-2) activity of metal complexes was determined by nitroblue tetrazolium (NBT) light reduction assay. Molecular docking studies with DNA and SOD enzyme were also carried out on these compounds. The antimicrobial study has shown that all the compounds are potential antibacterial agents against Gram-negative bacterial strains and better antifungal agents with respect to standard drugs used.

Triadica sebifera (Chinese tallow tree).

2021 ◽  
Author(s):  
Julissa Rojas-Sandoval
Keyword(s):  
Nutrient Recycling ◽  
Seed Kernel ◽  
Root Bark ◽  
Chinese Tallow Tree ◽  
Triadica Sebifera ◽  
Drying Oil ◽  
Vegetable Tallow ◽  
Tea Plantations ◽  
Timber Tree ◽  
A Minor

Abstract Triadica sebifera is a valuable multipurpose agroforestry species in the central Himalayan region and across Asia, and is also a popular ornamental tree for its colourful autumn leaves. The fruit of T. sebifera contains two types of fat. The white, fleshy outer seedcoat (sarcotesta) produces a fat known as Chinese vegetable tallow, while the cotyledons of the seed (kernel) yield a drying oil called stillingia oil. These oils are used as a substitute for cocoa butter in the food industry, to make paints, varnishes, soaps and candles, and to waterproof umbrellas. The leaves contain a dye, used in Asia to dye silk black. As an agroforestry species, Triadica sebifera is a good soil binder and contributes to nutrient recycling. It is planted in tea plantations as a shade tree and is also a minor timber tree. Its wood is sometimes used to make various implements, toys, furniture and Chinese printing blocks. The root, bark and leaves are used in traditional medicine in China (PROSEA, 2018; PROTA, 2018).

scholarly journals Synthesis of Fe3O4 and Fe2O3 nanoparticles using hybrid electrochemical-thermal method

2020 ◽  
Vol 55 (3) ◽  
pp. 221-228
Author(s):  
HA Simol ◽  
R Sultana ◽  
M Y A Mollah ◽  
MS Miran
Keyword(s):  
Iron Oxide ◽  
Total Pore Volume ◽  
Thermal Method ◽  
Prepared Compound ◽  
Xrd Pattern ◽  
Spectral Techniques ◽  
Different Temperatures ◽  
Ft Ir ◽  
Higher Temperature ◽  
Lower Temperature

Nanocrystalline Fe3O4 and Fe2O3 particles were successfully synthesized by an innovative hybrid electrochemical-thermal method. The as-prepared compound was calcined for an hour from 100 to 600oC temperatures. The crystallinity, morphology and chemical state of the synthesized powders were characterized by XRD, TG-DTA, SEM/EDS, FT-IR, and UV–Vis spectral techniques after calcinations. The Brunauer–Emmett–Teller (BET) plots confirmed that iron oxide nanoparticles (NPs) calcined at 400oC has a surface area of 18.28 m2 g-1 with a total pore volume of 0.2064 cc g-1. From XRD pattern it is revealed that the precursor calcined at lower temperature (100-400oC) correspond to Fe3O4,while the ones calcined at higher temperature follow Fe2O3 pattern. The morphology of iron oxide NPs calcined at different temperatures were studied with scanning electron microscope (SEM) and exhibits spherical shaped geometries with average diameters of 80-150nm. Bangladesh J. Sci. Ind. Res.55(3), 221-228, 2020

scholarly journals Influence of SiO2 Content and Exposure Periods on the Anticorrosion Behavior of Epoxy Nanocomposite Coatings

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 118 ◽  
Author(s):  
Alam ◽  
Samad ◽  
Sherif ◽  
Poulose ◽  
Mohammed ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
High Performance ◽  
Electrochemical Impedance ◽  
Steel Substrate ◽  
Sio2 Nanoparticles ◽  
Epoxy Coating ◽  
Properties Of Coatings ◽  
Ft Ir ◽  
Eis Measurements ◽  
Coating Formulations

Epoxy coating formulations containing 1%, 3%, and 5% SiO2 nanoparticles were produced and applied on a mild steel substrate to achieve the objective of high performance corrosion resistance. The electrochemical impedance spectroscopy (EIS) technique was employed to measure the anticorrosive properties of coatings. The corrosion tests were performed by exposing the coated samples in a solution of 3.5% NaCl for different periods of time, varied from 1 h and up to 30 days. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) analyses revealed the presence of nanoparticles in the final cured samples. Establishing the incorporation of the nanoparticles in the coating formulations was confirmed by employing both of XRD and FT-IR techniques. The FT-IR spectra have proved to be satisfactory indicating that there was a complete reaction between the epoxy resin with the hardener. EIS measurements confirmed that the presence and the increase of SiO2 nanoparticles greatly improved the corrosion resistance of the epoxy coating. The highest corrosion resistance for the coatings was obtained for the formulation with 5% SiO2 nanoparticles content, particularly with prolonging the immersion time to 30 days.

Effect of Vanadium Addition to Aluminum and Aluminum Grain Refined by Titanium on their Chemical Corrosion Rate in Acidic Solution, HCL, at Different Temperatures

2012 ◽  
Vol 510-511 ◽  
pp. 481-486
Author(s):  
A.I.O. Zaid ◽  
G.T.A. Allawi ◽  
A. Al-Haj-Ali
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Acidic Solution ◽  
Chemical Corrosion ◽  
Different Temperatures

The paper presents the effect of vanadium addition to aluminum and aluminum grain refined by titanium on the micron level, in the range from 0.005 wt % to 0.236 wt %, on their corrosion resistance in acidic solution, HCl, at three different temperatures namely: 25 °C, 40 °C and 60 °C. It was found that the corrosion rate was slightly increased by the addition of any percentage of vanadium at 25 °C. Furthermore, it was found that the corrosion rate increased with the increase of temperature at any percentage of vanadium addition in the case of both aluminum and aluminum grain refined by titanium. However it was found that addition of vanadium at any percentage to either aluminum or aluminum+ titanium, resulted in decrease of the corrosion rate i.e. improvement in their corrosion resistance in acidic solution at 40 °C and 60 °C. The maximum achieved reduction in corrosion rate was 77 % at 40 °C and 0.148 wt % vanadium addition.

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