scholarly journals Colored Polymeric Microcomposites with Minimal Environmental Impact

2017 ◽  
Vol 54 (3) ◽  
pp. 418-422
Author(s):  
Mircea Ruse ◽  
Sandu Peretz ◽  
Anca Angela Athanasiu ◽  
Loti Cornelia Oproiu ◽  
Catalin Filipescu ◽  
...  
Keyword(s):  
Controlled Release ◽  
Natural Fibers ◽  
Sem Analysis ◽  
Cotton Wool ◽  
Colorimetric Analysis ◽  
Ph Variation ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Minimal Environmental Impact

The paper presents the research carried out by our team on achieving amphiphilic polymeric microcomposites, colored in ruby and violet shades for natural fibers dyeing (cotton, wool). The colored polymeric microcomposites were characterized in term of their morpholo- gical (by optical microscopy and SEM analysis) and physicochemical performancies (by FT-IR and UV-Vis spectroscopy, colorimetric analysis). The colored microcapsules were tested by studying the controlled release of the encapsulated dyes in water, to pH variation. This study was necessary to the coloristic characterization of colored polymeric microcomposites to determine the optimal microcapsules dye concentration and dyeing concentration of natural fibers.

scholarly journals Synthesis, Fabrication, and Characterization of Functionalized Polydiacetylene Containing Cellulose Nanofibrous Composites for Colorimetric Sensing of Organophosphate Compounds

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1869
Author(s):  
A K M Mashud Alam ◽  
Donovan Jenks ◽  
George A. Kraus ◽  
Chunhui Xiang
Keyword(s):  
Solid State ◽  
Hydroxyl Groups ◽  
Colorimetric Sensing ◽  
Electrospinning Technique ◽  
Hazardous Chemical ◽  
Tensile Tester ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Landmark Study

Organophosphate (OP) compounds, a family of highly hazardous chemical compounds included in nerve agents and pesticides, have been linked to more than 250,000 annual deaths connected to various chronic diseases. However, a solid-state sensing system that is able to be integrated into a clothing system is rare in the literature. This study aims to develop a nanofiber-based solid-state polymeric material as a soft sensor to detect OP compounds present in the environment. Esters of polydiacetylene were synthesized and incorporated into a cellulose acetate nanocomposite fibrous assembly developed with an electrospinning technique, which was then hydrolyzed to generate more hydroxyl groups for OP binding. Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), Instron® tensile tester, contact angle analyzer, and UV–Vis spectroscopy were employed for characterizations. Upon hydrolysis, polydiacetylene esters in the cellulosic fiber matrix were found unaffected by hydrolysis treatment, which made the composites suitable for OP sensing. Furthermore, the nanofibrous (NF) composites exhibited tensile properties suitable to be used as a textile material. Finally, the NF composites exhibited colorimetric sensing of OP, which is visible to the naked eye. This research is a landmark study toward the development of OP sensing in a protective clothing system.

scholarly journals Synthesis, Crystal Structures, and Spectroscopic Characterization of Bis-aldehyde Monomers and Their Electrically Conductive Pristine Polyazomethines

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1498 ◽  
Author(s):  
Abdul Hafeez ◽  
Zareen Akhter ◽  
John F. Gallagher ◽  
Nawazish Ali Khan ◽  
Asghari Gul ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Spectroscopic Characterization ◽  
Spectroscopic Techniques ◽  
Conductivity Measurements ◽  
X Ray Diffraction ◽  
Electrically Conductive ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Ft Ir

Bis-aldehyde monomers 4-(4′-formyl-phenoxy)benzaldehyde (3a), 3-methoxy-4-(4′-formyl-phenoxy)benzaldehyde (3b), and 3-ethoxy-4-(4′-formyl-phenoxy)benzaldehyde (3c) were synthesized by etherification of 4-fluorobenzaldehyde (1) with 4-hydroxybenzaldehyde (2a), 3-methoxy-4-hydroxybenzaldehyde (2b), and 3-ethoxy-4-hydroxybenzaldehyde (2c), respectively. Each monomer was polymerized with p-phenylenediamine and 4,4′-diaminodiphenyl ether to yield six poly(azomethine)s. Single crystal X-ray diffraction structures of 3b and 3c were determined. The structural characterization of the monomers and poly(azomethine)s was performed by FT-IR and NMR spectroscopic techniques and elemental analysis. Physicochemical properties of polymers were investigated by powder X-ray diffraction, thermogravimetric analysis (TGA), viscometry, UV–vis, spectroscopy and photoluminescence. These polymers were subjected to electrical conductivity measurements by the four-probe method, and their conductivities were found to be in the range 4.0 × 10−5 to 6.4 × 10−5 Scm−1, which was significantly higher than the values reported so far.

Study on the Synthesis and Characterization of PANi/Nano-CeO2 Composites

2007 ◽  
Vol 124-126 ◽  
pp. 287-290 ◽  
Author(s):  
Fei Liu ◽  
Yong Jun He ◽  
Jeung Soo Huh
Keyword(s):  
In Situ Polymerization ◽  
Solid Phase ◽  
Polymerization Reaction ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Average Size

The nano-CeO2 was synthesized by two-step solid-phase reaction. The image of TEM showed that nano-CeO2 with an average size of about 70 nm. The series of polyaniline/nano-CeO2 composites with different PANi: CeO2 ratios were prepared by in-situ polymerization in the presence of hydrochloric acid (HCl) as dopant by adding nano-CeO2 into the polymerization reaction mixture of aniline. The composites obtained were characterized by FT-IR and UV-vis spectroscopy analysis. The FT-IR spectra of nanocomposites indicate different blue-shifts, attributed to C–N stretching mode for benzenoid unit. The UV-vis spectra of nanocomposites display einstein-shifts compared with PANi at 620nm. The conductivity properties of the composites are also changed compare to the pure PANi. These results suggest that the interactions between the polymer matrix and nanoparticles take place in polyaniline/nano- CeO2 composites.

A Facile Method for Synthesis of CdS/P(St-сo-MMA) Nanorods Composite and Characterization of its Optical Properties

2015 ◽  
Vol 37 ◽  
pp. 20-27
Author(s):  
Asghari Jila ◽  
Khoje Golshad
Keyword(s):  
Quantum Confinement Effect ◽  
Cadmium Sulphide ◽  
Sem Analysis ◽  
Cds Nanoparticles ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Mass Approximation ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Methyl Metacrylate

Composite of Cadmium sulphide (CdS) nanoparticle on the surface of polystyrene- co- maleic anidride (St-co-MMA) were prepared via surfactant free emulsion polymerization. Methylmetacrylate (MMA) was used as auxiliary monomer which co-polymerized with styren (St) and provided the side for coordinating with Cd2+. By the coordination of Cd2+ ions to methyl metacrylate, decoration of the Cd2+ ions on the surface of copolymer were prepared successfully. With the release of S2- ions from the thioacetamide (TAA), CdS was formed on the surface of nanorods copolymer in facile method. Fourier transform infrared spectroscopy (FT-IR) of nanocomposite was confirmed the polymerization of monomers. Structure and morphology of CdS nanoparticles have been characterized using x-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD measurements suggest the cubic structure for CdS and the particles size was estimated to about 3.35 nm by applying Scherrer’s equation. The SEM analysis confirmed the nanorode structure of CdS/ (St-co-MMA) composite. The photoluminescence (PL) and UV–Vis spectroscopy revealed the quantum confinement effect in the CdS/ (St-co-MMA) nanocomposite. Using effective mass approximation (EMA) method particle sizes were calculated from the shift in optical band gap. The thermal properties of the CdS/ (MMA-co-St) were explored by thermal gravimetric analysis (TGA). The improved thermal stability of nanocomposite was attributed to the interaction of CdS nanoparticles with polymer. The CdS/ (MMA-co-St) nanocomposite exhibited a glass transition temperature around 250◦C.

scholarly journals Preparation and characterization of highly blue emitting fluorescent carbon nano-dots using Pongammia pinnata fresh leaves

2021 ◽  
Author(s):  
Govindaraju K ◽  
K. Vijai Anand ◽  
S. Muthamilselvan ◽  
M. Kannan ◽  
M. Elanchezhiyan
Keyword(s):  
Electron Microscopy ◽  
Water Soluble ◽  
Hydrothermal Technique ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Average Size ◽  
Soluble Carbon ◽  
Ft Ir Spectroscopy

Abstract In this study, a simple environmental benign approach have been adopted for the preparation of highly luminescent (blue emitting) water soluble carbon nano-dots using Pongammia pinnata (Pp) leaves via hydrothermal technique. The prepared Pp-carbon nano- dots were characterized using UV-vis spectroscopy, fluorescence spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM) and dynamic light scattering (DLS) measurements. The Pp-carbon nano-dots are spherical in shape with an average size of 32 nm.

scholarly journals Structural stability of biofilms produced from silkworm cocoon fibers

2021 ◽  
pp. 54-54
Author(s):  
Souza Felício ◽  
Henrique Santana
Keyword(s):  
Conformational Changes ◽  
Casting Process ◽  
Scanning Calorimetry ◽  
Molecular Conformations ◽  
Freeze Dried ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Silkworm Cocoon ◽  
Band Characteristic

Biofilms were obtained from cocoons of the silkworm, Bombyx mori, involving the removal of sericin, extraction and solubilization of fibroin fibers, dialysis of fibroin dispersions and preparation of biofilms by the casting process. Biofilm transparency was verified by UV-Vis spectroscopy and thermal stability by thermogravimetric/differential scanning calorimetry (TG/DSC). Soon after preparation, the solidification of the fibroin solution prepared from the cocoons and extracted by the Ajisawa method was monitored until the biofilm stabilized, using Attenuated Total Reflectance-Fourier Transform Infrared spectroscopy (ATR FT-IR) as a function of time. The results showed that there is a change in the conformation from the silk I structure (?-helix) to silk II (?-sheet). In order to improve the characterization of the biofilms obtained by the Ajisawa method and LiBr solubilization of fibroin fibers, Raman spectroscopy was used to verify stabilization of the different possible molecular conformations for the fibers in these materials, by comparison with the cocoon spectra and those of the solid (freeze-dried hydrogel) precipitated by dialysis for 72 h. By comparing the Raman spectra of the biofilms in terms of the intensities of the broadened band characteristic of amide I, it was possible to assess the conformational changes in both materials based on possible transitions between ?-sheet conformations and flexible ?-helix and ?-turn structures. The results showed a dispersion of these conformations in the biofilms generated and in the solid freeze-dried hydrogel spectrum, and the ?-sheet conformation was found to be predominant. The TG and DSC curves showed that the materials with higher ?-sheet content exhibited higher thermal resistance. Thus, the data obtained further elucidate the properties of these materials which are widely used in various processes.

scholarly journals Studies on the growth and characterization of L-cysteine hydrogen fluoride single crystal

2019 ◽  
Vol 37 (3) ◽  
pp. 304-309
Author(s):  
Azeezaa Varsha Mohammed ◽  
Suresh Sagadevan
Keyword(s):  
Single Crystal ◽  
Hydrogen Fluoride ◽  
Grown Crystal ◽  
Optical Band Gap ◽  
Second Harmonic ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Ft Ir

AbstractL-cysteine hydrogen fluoride (LCHF) single crystals were grown from aqueous solution. Single crystal X-ray diffraction, FT-IR, UV-Vis-NIR, and TG-DTA were used to test the grown crystals. The specimen dielectric and mechanical behaviors were also studied. Powder X-ray diffraction of the grown crystal was recorded and indexed. The optical properties of the LCHF crystal were determined using UV-Vis spectroscopy. It was found that the optical band gap of LCHF was 4.8 eV. The crystal functional groups were identified using FT-IR. Second harmonic generation (SHG) efficiency of the LCHF was three times higher than that of KDP. The dielectric constant, dielectric loss and AC conductivity were measured at different frequencies and temperatures.

scholarly journals Synthesis and Characterization of 2,3-Diaminomaleonitrile Derivatives by One-Pot Schiff Base Reaction and Their Application in Dye Synthesized Solar Cells

2020 ◽  
Author(s):  
Saifaldeen Muwafag Abdalhadi ◽  
Asmaa Yahya Al-Baitai ◽  
Hazim Abdulrazzaq Al-Zubaidi
Keyword(s):  
Schiff Base ◽  
Solar Cells ◽  
Melting Point ◽  
Computational Study ◽  
Control Cell ◽  
Synthesis And Characterization ◽  
One Pot ◽  
Vis Spectroscopy ◽  
Ft Ir

In a one-pot reaction, three new 2,3-diaminomaleonitrile (DAMN) derivative dyes were prepared by simple Schiff base reaction. The compounds were designed as a sensitizer in dye synthesizes solar cells (DSSCs). Many conditions have been used to provide the methodology to get the best yield. The prepared dyes were characterized by melting point, elemental microanalysis, mass spectroscopy, FT-IR, 1H-NMR, and UV-Vis spectroscopy. A computational study was carried out to support our results. The DSSC data was shown the best performance for SA3 dye with 0.38% efficiency at AM 1.5 then SA2 with 0.22% and the last dye is SA1 with 0.09%, compared to control cell (N719) 5.4%.

scholarly journals Green formulation and characterization of Fe nanoparticles containing Calendula ‎extract and investigation of the antioxidant, cytotoxicity and anti-human ‎cholangiocarcinoma properties

2021 ◽  
Author(s):  
Jisen Zhao ◽  
Yang Yu ◽  
Wang Yan ◽  
Shujie Cheng
Keyword(s):  
Cell Lines ◽  
Metallic Nanoparticles ◽  
Medical Diagnostics ◽  
Morphological Characterization ◽  
Sem Images ◽  
Integrative Research ◽  
Vis Spectroscopy ◽  
Cholangiocarcinoma Cell ◽  
Ft Ir

IntroductionOne of the simplest nanostructures that is widely used in industry today is metallic nanoparticles. Metallic ‎nanoparticles can bind non-destructively to single-stranded DNA, which are important in medical diagnostics. ‎Cancer nanotechnology developed a new area of integrative research in biology, chemistry, engineering, and ‎medicine, and is concerned with major advances in cancer diagnosis, prevention and treatment ‎Material and methods‎ In the recent study, the structural and morphological characterization of bio‐synthesized FeNPs@Calendula ‎arvensis was performed by FT-IR and UV-vis spectroscopy, scanning electron microscopy (SEM) that SEM ‎images have exhibited an equal and uniform spherical morphology in size of 30.13 nm. ‎ResultsIn the antioxidant test, the IC50 of FeNPs@Calendula arvensis and BHT against DPPH free radicals were 117 ‎and 88 µg/mL, respectively. In the anticancer test, the treated cells with FeNPs@Calendula arvensis were ‎assessed by MTT assay for 48h about the anti-human cholangiocarcinoma and ‎ cytotoxicity properties on normal ‎‎(HUVEC) and cholangiocarcinoma ‎ carcinoma cell lines i.e., HCM-CSHL-0174-C22, CCLP-1, and QBC939. ‎The IC50 of FeNPs@Calendula arvensis were 196, 237, and 278 µg/mL against HCM-CSHL-0174-C22, ‎CCLP-1, and QBC939‎ cell lines, respectively. The viability of cholangiocarcinoma cell line reduced dose-‎dependently in the presence of FeNPs@Calendula arvensis.‎ConclusionsIt appears that the anti-human cholangiocarcinoma effect of FeNPs@Calendula arvensis is due to their ‎antioxidant effects.‎

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