scholarly journals Fabrication and Characterization of Polyvinyl Chloride/Copolyester/Nanoclay Composite Nanofiber

2021 ◽  
Vol 33 (8) ◽  
pp. 1868-1874
Author(s):  
S. Jasmine ◽  
D. Reuben Jonathan ◽  
J. Sidharthan ◽  
D. Roopsingh
Keyword(s):  
Polyvinyl Chloride ◽  
Room Temperature ◽  
Composite Nanofibers ◽  
Schmidt Reaction ◽  
Electrospinning Method ◽  
Composite Nanofiber ◽  
Nmr Techniques ◽  
Ft Ir ◽  
Acid Catalyzed

Four random copolyesters were prepared by the polycondensation reaction of diols namely 1,5-dihydroxyanthraquinone, 4,4′-oxybis(benzoic acid) and variable chalcone diol. Four chalcone diols were produced by acid catalyzed Claisen-Schmidt reaction at room temperature. These random copolyesters were elucidated by solubility tests and viscosity measurements. The FT-IR, 1H & 13C NMR techniques were applied to establish the repeating units present in the copolyester backbone. Electrospinning method was employed to derive polyvinyl chloride-copolyester-nanoclay composite nanofiber from tetrahydrofuran medium. Scanning electron microscopy (SEM) was utilized to examine the morphology of the nanofibers. These composite nanofibers are expected to be a potential biomaterial of greater significance.

Preparation and Characterization of Electro-Spun Fabricated Ag–TiO2 Composite Nanofibers and Its Enhanced Photo-Catalytic Activity for the Degradation of Congo Red

2015 ◽  
Vol 15 (10) ◽  
pp. 7988-7996
Author(s):  
Arvind H. Jadhav ◽  
Hongliang Zhang ◽  
Frank O. Agyemang ◽  
Vishwanath Hiremath ◽  
Kyuyoung Lee ◽  
...  
Keyword(s):  
Congo Red ◽  
Room Temperature ◽  
Composite Nanofibers ◽  
Significant Loss ◽  
Solar Light ◽  
Precipitation Method ◽  
Filtration Process ◽  
Experimental Conditions ◽  
Subsequent Step

Electro-spun fabricated TiO2 nanofibers were prepared by simple electro-spinning method, in subsequent step silver (Ag) was deposited using precipitation method and obtained Ag-TiO2 composite nanofibers. The properties and morphology of these prepared composite nanofibers were characterized by XRD, SEM, EDX, and TGA. The prepared electro-spun composite nanofibers were applied as catalyst for the photodegradation of Congo-red under immited solar light in aqueous solution. Result reveals that, Ag loaded TiO2 composite nanofibers were effectively increased photodegradation of Congo red compared with pure TiO2 nanofibers in analogous condition. As a result, 92.0% decomposition of Congo red was obtained by using 5 wt% of Ag loaded TiO2 composite nanofibers at room temperature in short reaction time using 300 W of solar light. In addition, photodegradation of Congo red was also studied under different experimental conditions such as amount of Ag loaded in TiO2 nanofibers and contact time. Moreover, we also studied sintering effect on TiO2 nanofibers and their consequent effect on photodegradation reaction. After completion of reaction, the nanofibers can be easily separated by filtration process and reused several times without significant loss of activity. Overall study reveals that, Ag–TiO2 composite nanofibers were strongly enhanced the surface activity for the photo catalytic degradation of Congo red under ambient condition.

Characterization of Electrospun Poly(Lactic Acid)/polyaniline Blend Nanofibers

2011 ◽  
Vol 332-334 ◽  
pp. 317-320 ◽  
Author(s):  
Hui Qin Zhang
Keyword(s):  
Lactic Acid ◽  
Composite Nanofibers ◽  
Weight Ratio ◽  
Electrospinning Process ◽  
Poly Lactic Acid ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Ft Ir

In this study, composite nanofibers of polyaniline doped with dodecylbenzene sulfonic acid (PANI-DBSA) and Poly(lactic acid) (PLA) were prepared via an electrospinning process. The surface morphology, thermal properties and crystal structure of PLA/PANI-DBSA nanofibers are characterized using Fourier transform infrared spectroscopy (FT-IR), wide-angle x-ray diffraction (WAXD) and scanning electron microscopy (SEM). SEM images showed that the morphology and diameter of the nanofibers were affected by the weight ratio of blend solution.

scholarly journals Morphology and Surface Properties of Poly (L-lactic acid)/Captopril Composite Nanofiber Membranes

2012 ◽  
Vol 7 (1) ◽  
pp. 155892501200700 ◽  
Author(s):  
Anfang Wei ◽  
Juan Wang ◽  
Xueqian Wang ◽  
Dayin Hou ◽  
Qufu Wei
Keyword(s):  
Lactic Acid ◽  
Composite Nanofibers ◽  
Chemical Components ◽  
Pore Width ◽  
Surface Areas ◽  
Composite Nanofiber ◽  
Mass Fractions ◽  
Ft Ir ◽  
Nanofiber Membranes ◽  
Better Than

In this study, Poly (L-lactic acid)/Captopril composite nanofiber membranes were electrospun for drug delivery. Different mass fractions of Poly (L-lactic acid), different ratios of Captopril and the influences of PEG4000 added in the spinning solution are discussed. The morphology, chemical components, the surface areas and pore sizes, wettability of the composite nanofiber membranes were investigated. The results showed that the diameters of the composite nanofibers increased with the increase of Poly (L-lactic acid) mass fractions, the diameters decreased with the increase of Captopril content as well as the addition of the surfactant. Fourier Transform Infrared (FT-IR) showed the chemical components of Captopril remained unchanged when it was electrospun into the composite nanofibers. The surface areas pore width and pore volume of the composite nanofibers became a little larger than those of poly (L-lactic acid) nanofibers, and the wettability of the composite nanofiber membranes was better than those of poly (L-lactic acid) nanofiber membranes. Wettability was improved by an increase of the drug load amount.

Preparation and characterization of iron(III) 99Mo-molybdate(VI) gels for the assessment of 99mTc elution performance

2018 ◽  
Vol 106 (1) ◽  
pp. 47-57 ◽  
Author(s):  
Mahmoud Amin ◽  
Tharwat W. Fasih ◽  
Mohamed A. El-Absy
Keyword(s):  
Room Temperature ◽  
Saline Solution ◽  
Mixed Solution ◽  
Filtration Method ◽  
Chromatographic Columns ◽  
Water Of Hydration ◽  
Ambient Room Temperature ◽  
Ft Ir ◽  
Mo Content

AbstractNew iron(III)99Mo-molybdate(VI) gels (Fe99Mo) of high Mo content were prepared by the precipitation/filtration method.99Mo–MoO3dissolved in NaOH was added to aqueous solutions of Fe(NO3)3at Mo/Fe mole fractions ~2.21 and 1.99 with continuous stirring at ambient room temperature. Two different Fe99Mo were precipitated from the mixed solutions adjusted at pH 2 and 4.7. The amount of water of hydration increased with the increasing the gel settling time and pH of the mixed solution. The matrices were characterized by radiometric, XRD, SEM, XRF, FT-IR, TGA, and DTA measurements. Small chromatographic columns of 2.0 g Fe99Mo containing ≥800 mg Mo tagged with 740 MBq99Mo were eluted with 5 mL saline solution. Highly reproducible99mTc elution indices suitable for preparation of99Mo/99mTc generators were achieved from generator supported with 0.5 g Al2O3filter. Elution performance of99mTc radionuclide was highly dependent on the gel structural properties.

Synthesis and Characterization of Novel Fluorene-Based Poly(Imino Ketone)s

2011 ◽  
Vol 335-336 ◽  
pp. 1086-1089
Author(s):  
Lin Zhang ◽  
Guan Jun Chang ◽  
Lu Bin Miao ◽  
Run Xiong Lin
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Main Chain ◽  
High Glass Transition Temperature ◽  
Good Solubility ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ft Ir ◽  
Ether Ketone

Fluorene-based poly(imino ketone)s (PIKF) were designed and synthesized by reacting 1,4-Bis-(4-bromobenzoyl)-benzene and 9,9-bis(3-R-4-aminophenyl)fluorine (R: H, CH3 or F). The structures of the resulting polymers were characterized by FT-IR, 1H NMR spectroscopy and elemental analysis. The thermo and optical properties of PIKF were evaluated. Good solubility of PIKF in ordinary organic solvents such as THF and chloroform was confirmed. PIKF were amorphous at room temperature. No phase transition except for Tg was confirmed in the DSC analysis. PIKF displayed a high glass transition temperature (Tg > 215 °C) in comparison with commercially available poly(ether ether ketone) (PEEK Tg = 169 °C). The UV-vis absorption spectrum of polymers exhibited two absorption peaks around 271 nm and 369 nm; The fluorescence spectrum of the PIKF-1, 2 and PIKF-3 showed a maximum emission wavelength at 502 nm and 491 nm, respectively. These optical properties were probably related to the cardo structure of the fluorene moiety placed on the main chain.

scholarly journals Characterization of Copper Phthalocyanine-Tetrasulfonic Acid Tetrasodium Salt /Graphene Oxide

2021 ◽  
pp. 1893-1900
Author(s):  
Mayada Waheed Kazem ◽  
Raed Kamel Jalal
Keyword(s):  
Graphene Oxide ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Copper Phthalocyanine ◽  
Chemical Compounds ◽  
Ir Absorption ◽  
Mixing Ratios ◽  
Coating Method ◽  
Ft Ir

In this paper, the pure graphene oxide and copper phthalocyanine-tetrasolfonic acid tetrasodium salt were used to prepare thin films by using the spin coating method. These chemical compounds have remarkable optical properties and are chemically used in the development of device sensors by increasing the mixing ratio. Three different mixing ratios were prepared at room temperature and 150oC annealing temperature for three hours. The spectra of UV-VIS-IR absorption, photoluminescence, and Fourier-transformed infrared (FT-IR) were studied.

scholarly journals Isolation of an isoflavonoid and a terpenoid from the heartwood of Baphia nitida Lodd. (camwood)

2020 ◽  
Vol 31 (1) ◽  
pp. 5-8
Author(s):  
Gloria Ihuoma Ndukwe ◽  
Amarachi Oluah ◽  
Godswill Kuta Fekarurhobo
Keyword(s):  
Quantum Coherence ◽  
Methanolic Extract ◽  
Ultra Violet ◽  
Molecular Formula ◽  
Heteronuclear Single Quantum Coherence ◽  
Violet Light ◽  
Nmr Techniques ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

AbstractChromatographic separation of methanolic extract of Baphia nitida heartwood gave two crystalline solids characterized as 3,9-dimethoxy-6aR,11aR-dihydro-6H-benzofuro(3,2-C)[1]benzopyran (also known as homopterocarpin) with molecular formula C17H16O4 (1.57% yield) and 2,4-dimethoxybenzaldehyde C9H10O3 (2.27% yield). Each of the isolated compounds showed a single spot on developed thin layer chromatographic plate under ultra-violet light (254 nm) and spray reagent (10% sulfuric acid in methanol solution). Structural elucidation was achieved using Fourier transform infrared (FT-IR) spectroscopy, one and two-dimension nuclear magnetic resonance (NMR) techniques. Distortionless enhancement by polarization transfer-edited-heteronuclear single quantum coherence (DEPT-ed-HSQC) was also a useful tool that aided the characterization of the two secondary metabolites isolated from Baphia nitida heartwood.

Synthesis and Characterization of Siloxane-Polyurethane Hybrid Materials

2008 ◽  
Vol 396-398 ◽  
pp. 481-484
Author(s):  
Rodrigo Jiménez-Gallegos ◽  
L. Téllez-Jurado ◽  
Luis M. Rodríguez-Lorenzo ◽  
Julio San Román
Keyword(s):  
Hybrid Materials ◽  
Sol Gel ◽  
Proton Nuclear Magnetic Resonance ◽  
X Ray Diffraction ◽  
Organic Part ◽  
Sol Gel Process ◽  
Nmr Techniques ◽  
Ft Ir ◽  
Characterization Of Materials

This paper focuses on the preparation of siloxane-polyurethane hybrid materials using a sol-gel method. The global aim of the project is to tailor mechanical properties, degradability rate, bioactivity and biocompatibility to design scaffolds for musculoskeletal applications. A series of seven hybrid materials were synthesized with varying the proportion of polydimethylsiloxane (PDMS), and Polyurethane (PU). The organic part ratios (by weight) employed were (% PDMS:% PU) 30:0, 35:5, 20:10, 15:15, 10:20, 5:25, and 0:30. The organic part was reacted with constant 70 % TEOS to obtain the hybrid materials. A sol-gel process was selected for the synthesis of the hybrids. The characterization of materials was carried out by the fourier-infrared spectroscopy (FT-IR), x-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electronic microscopy (SEM) and proton nuclear magnetic resonance (1H-NMR) techniques in order to analyze the structure, microstructure and chemical composition of the hybrid materials. Gelification time depends on the proportion of PU used. When no PU is employed, the gel time is 8 hours but it rises up to 18 days for 30 % of polyurethane. Materials range from opaque to translucent but with a greater fragility for greater amounts of polyurethane. No differences in the bonding of materials could be appreciated.

scholarly journals Production and Characterization of Biodiesel from Aphanamixis polystachya Seed Oil

2020 ◽  
Vol 68 (2) ◽  
pp. 129-136
Author(s):  
Sazia Ifteqar ◽  
Rajia Sultana ◽  
Sujit Banik ◽  
AFM Mustafizur Rahman
Keyword(s):  
Seed Oil ◽  
Biodiesel Production ◽  
Optimum Conditions ◽  
Alternative Diesel Fuel ◽  
Biodiesel Standards ◽  
Ft Ir ◽  
Acid Catalyzed ◽  
Edible Seed ◽  
Ft Ir Spectroscopy

The present study focuses on the utilization of non-edible Aphanamixis polystachya seed oil as a potential feedstock for the production of biodiesel. The extracted oil from non-edible seed could not be directly exploited for biodiesel production owing to its high free fatty acid (FFA) content of 5.785%, so acid catalyzed esterification was applied to reduce FFA of oil to zero followed by base-catalyzed transesterification to convert esterified product to its mono-esters. Thermogravimetric analysis (TGA) revealed that the mass percentage corresponding to biodiesel under optimum conditions was 74.38%. The conversion of the triglycerides in the oil into biodiesel through transesterification was confirmed using FT-IR spectroscopy. The elemental analysis of the produced biodiesel was studied. The produced biodiesel had properties which were comparable with biodiesel standards and could be utilized as an alternative diesel fuel without any hardware modifications. Dhaka Univ. J. Sci. 68(2): 129-136, 2020 (July)

scholarly journals Characterization of bio-Oil produced by Microwave Pyrolysis of Karanja Seed.

2019 ◽  
Vol 9 (2) ◽  
pp. 4271-4275
Keyword(s):  
Room Temperature ◽  
Microwave Pyrolysis ◽  
Aliphatic Compounds ◽  
Noncondensable Gases ◽  
Fire Point ◽  
Bio Oil ◽  
Power Inputs ◽  
Ft Ir ◽  
Pyrolysis Experiment

Pyrolysis is one technique that produces three products in a short span of time in which both conventional and non-conventional method of heating (microwave irradiation) can be done. Karanja seed powder is taken as the feedstock in this microwave pyrolysis experiment. Proximate and Elemental analysis of karanja seed powder resulting volatile content of about 84.89% and moisture content of 10.11% whereas the Carbon of 52.08%, Hydrogen of 8.26%, Sulphur of 0.21%, Nitrogen of 4.02% and oxygen of 35.04%. Microwave pyrolysis for karanja seed was conducted for two power inputs of 700W and 800W in which bio-oil yield is high of 47% at 700W and noncondensable gases of 39% at 800W. The FT-IR results resembles the presence of aliphatic compounds. The TGA analysis was also taken for the produced bio-oil. The rheological study was made to determine the dynamic viscosity of the produced bio-oil at 50 rpm in room temperature which is averaged to 52 cP. The flash point of 90°C and fire point of 94°C was also determined for the produced bio-oil

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