scholarly journals Monitoring the Photodegradation of PVC Thin Films Containing Schiff Base Using FTIR Spectroscopy

2019 ◽  
Vol 4 (1) ◽  
pp. 12-17
Author(s):  
Ali Hassan ◽  
Dina S. Ahmed ◽  
Riyadh Noaman ◽  
Emad Yousif
Keyword(s):  
Thin Films ◽  
Schiff Base ◽  
Light Intensity ◽  
Metal Complexes ◽  
Ftir Spectroscopy ◽  
Uv Irradiation ◽  
Infrared Spectra ◽  
Uv Light ◽  
Base Derivative

Metal complexes of Cu(II), Cd(II), Zn(II), Ni(II) and Sn(II) containing Schiff base derivative (L) as a ligand (ML2) utilized as additives to avoid PVC films photodegradation during UV irradiation (λmax= 313 at a light intensity = 7.75 × 10-7 einstein dm-3 sec-1). Irradiation of PVC films with UV light due to changes in infrared spectra.

scholarly journals Detection the Degradation of PS Thin Films Containing Triazole Complexes by FTIR Techniques

2018 ◽  
Vol 3 (1) ◽  
pp. 53-57
Author(s):  
Raghad Haddad ◽  
Dina S. Ahmed ◽  
Wedad H. Al-Dahhan ◽  
Ahmed Ahmed ◽  
Salam Mohammed ◽  
...  
Keyword(s):  
Thin Films ◽  
Ftir Spectroscopy ◽  
Infrared Spectra ◽  
Room Temperature ◽  
Uv Light ◽  
Polymeric Films ◽  
Casting Method

4-amino-5-(pyridyl)-4H-1,2,4-triazole-3-thiol (X) with Ni2+, Cu2+, Zn2+, Cd2+ and Sn2+ has been synthesized also used as PS photostabilizers. In chloroform solvent, these complexes mixed with PS to form modified PS, which involving (0.5 % wt) of complexes were prepared using casting method. At room temperature the intensity of light (6.02×10-9 Ein Dm-3 S-1) and wavelength 365 nm with utilized to irradiate polymeric films. PS films irradiation with UV light led to obvious changes in infrared spectra. The photostabilization activity of these polymeric films was investigated by observation the indices using FTIR spectroscopy.

scholarly journals Effect of Water Leaching on Photodegraded Scots Pine and Spruce Timbers Monitored by FTIR Spectroscopy

Forests ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 833
Author(s):  
Edina Preklet ◽  
László Tolvaj ◽  
Eszter Visi-Rajczi ◽  
Tamás Hofmann
Keyword(s):  
Ftir Spectroscopy ◽  
Scots Pine ◽  
Uv Irradiation ◽  
Chemical Elements ◽  
Uv Light ◽  
Carbonyl Groups ◽  
Water Leaching ◽  
Absorption Bands ◽  
Chemical Changes ◽  
Absorption Increase

The goal of this research was the systematic study and comparison of the divided individual effects of UV light irradiation and water leaching during artificial weathering. Spruce (Picea abies Karst.) and Scots pine (Pinus sylvestris L.) samples were irradiated by ultraviolet (UV) light. Another sequence of samples was treated with the combination of UV irradiation and water leaching. The total extent of UV treatment was 20 days for both series of samples. Time relation of UV irradiation and water leaching was 2:1. The chemical changes were observed by FTIR spectroscopy. The difference spectrum was used for determination of the chemical changes. Degradation of lignin was greater for the leached samples than for the pure UV treated samples. Scots pine suffered greater lignin degradation than spruce, and produced higher absorption increase on the absorption region of unconjugated carbonyls. The unconjugated carbonyl groups were the most responsive chemical elements to leaching. Spruce was more susceptible to leaching of unconjugated carbonyl groups than Scots pine. Two absorption bands of unconjugated carbonyl groups at 1706 and 1764 cm−1 wavenumbers were produced by photodegradation. The absorption band at 1764 cm−1 was more sensitive to water leaching than the band at 1706 cm−1.

Schiff base derivative doped chiral nematic liquid crystals with a large wavelength shift driven by temperature and light

2020 ◽  
Vol 8 (2) ◽  
pp. 561-566
Author(s):  
Lei Ren ◽  
Wanli He ◽  
Meiju Wei ◽  
Shiguang Luo ◽  
Daipeng Yao ◽  
...  
Keyword(s):  
Schiff Base ◽  
Liquid Crystals ◽  
Uv Light ◽  
Light Irradiation ◽  
Wavelength Shift ◽  
Uv Light Irradiation ◽  
Chiral Nematic ◽  
Base Derivative ◽  
Chiral Liquid Crystals ◽  
Large Wavelength

A chiral salicylaldehyde Schiff-base was successfully synthesized and was used to develop responsive chiral liquid crystals with large wavelength shift driven by temperature and UV light irradiation.

Spectral and Thermal Investigation of Novel Glycine-Based Schiff Base Derivative and its Metal Complexes

2011 ◽  
Vol 474-476 ◽  
pp. 543-547
Author(s):  
Ti Feng Jiao ◽  
Juan Zhou ◽  
Jing Xin Zhou ◽  
Yuan Yuan Xing ◽  
Xu Hui Li
Keyword(s):  
Thermal Stability ◽  
Schiff Base ◽  
Metal Complexes ◽  
Metal Ion ◽  
Uv Spectra ◽  
Ethanol Solution ◽  
Hydroxyl Group ◽  
Imino Group ◽  
Base Derivative ◽  
Ft Ir

A novel glycine-based Schiff base derivative (abbreviated as C16GlySb) containing long alkyl chain was synthesized from glycine reacted with 4-cetyloxy-2-hydroxybenzaldehyde and sequentially coordinated with various metal ions to give the corresponding metal complexes (abbreviated as G-M). The products were characterized by UV-Vis spectra and FT-IR spectra. At the same time, the thermal stability was measured by TG-DTA instrument. FT-IR analysis indicated that the nitrogen atom in imino group, oxygen atom in phenolic hydroxyl group, and carboxylic ion participated in coordinating with transition metal ion in doubly-bridged mode. UV spectra showed that compared with ethanol solution, the cast film on quartz plate showed H-type or J-type aggregate structure. In addition, the thermal stability of G-M had been obviously superior to that of the ligand C16GlySb. The present results have showed potential application in fields of functional material and catalyst.

scholarly journals Effect of localized UV irradiation on the crystallinity and electrical properties of dip-coated polythiophene thin films

RSC Advances ◽  
2020 ◽  
Vol 10 (56) ◽  
pp. 34130-34136
Author(s):  
So Young Park ◽  
Eun Hye Kwon ◽  
Yeong Don Park
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Uv Irradiation ◽  
Uv Light ◽  
P3ht Film ◽  
Enhanced Crystallinity

When the top part of the solution was irradiated with UV light, the dip-coated P3HT film showed enhanced crystallinity and electrical properties.

scholarly journals Synthesis of Carvedilol–Organotin Complexes and Their Effects on Reducing Photodegradation of Poly(Vinyl Chloride)

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 500 ◽  
Author(s):  
Omar G. Mousa ◽  
Gamal A. El‐Hiti ◽  
Mohammed A. Baashen ◽  
Muna Bufaroosha ◽  
Ahmed Ahmed ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Morphology ◽  
Vinyl Chloride ◽  
Uv Irradiation ◽  
Chemical Structure ◽  
Uv Light ◽  
Poly Vinyl Chloride ◽  
Pvc Film ◽  
Tin Complexes

Poly(vinyl chloride) (PVC) undergoes photodegradation induced by ultraviolet (UV) irradiation; therefore, for outdoor applications, its photostability should be enhanced through the use of additives. Several carvedilol tin complexes were synthesized, characterized and mixed with PVC to produce thin films. These films were irradiated at 25 °C with a UV light (λ = 313 nm) for up to 300 h. The reduction in weight and changes in chemical structure and surface morphology of the PVC films were monitored. The films containing synthesized complexes showed less undesirable changes than the pure PVC film. Organotin with a high content of aromatics was particularly efficient in inhibiting photodegradation of PVC. The carvedilol tin complexes both absorbed UV light and scavenged radicals, hydrochloride, and peroxides and, therefore, photostabilized PVC.

scholarly journals Multi-Level Evaluation of UV Action upon Vitamin D Enhanced, Silver Doped Hydroxyapatite Thin Films Deposited on Titanium Substrate

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 120
Author(s):  
Catalin Constantin Negrila ◽  
Daniela Predoi ◽  
Rodica V. Ghita ◽  
Simona Liliana Iconaru ◽  
Steluta Carmen Ciobanu ◽  
...  
Keyword(s):  
Thin Films ◽  
Uv Irradiation ◽  
Uv Light ◽  
Titanium Substrate ◽  
Degradation Process ◽  
Tissue Reconstruction ◽  
Multi Level ◽  
First Time ◽  
Vacuum Deposition Method ◽  
Ftir Investigation

Hydroxyapatite Ca10(PO4)6(OH)2 (HAp) is an important bioactive material for bone tissue reconstruction, due to its highly thermodynamic stability at a physiological pH without bio-resorption. In the present study, the Ag:HAp and the corresponding Ag:HAp + D3 thin films (~200 nm) coating were obtained by vacuum deposition method on Ti substrate. The obtained samples were exposed to different UV irradiation times, in order to investigate the UV light action upon thin films, before considering this method for the thin film’s decontamination. The effects of UV irradiation upon Ag:Hap + D3 are presented for the first time in the literature, marking a turning point for understanding the effect of UV light on composite biomaterial thin films. The UV irradiation induced an increase in the initial stages of surface roughness of Ag:HAp thin film, correlated with the modifications of XPS and FTIR signals. The characteristics of thin films measured by AFM (RMS) analysis corroborated with XPS and FTIR investigation highlighted a process of recovery of the thin film’s properties (e.g., RMS), suggesting a possible adaptation to UV irradiation. This process has been a stage to a more complicated UVA rapid degradation process. The antifungal assays demonstrated that all the investigated samples exhibited antifungal properties. Moreover, the cytotoxicity assays revealed that the HeLa cells morphology did not show any alterations after 24 h of incubation with the Ag:HAp and Ag:HAp + D3 thin films.

scholarly journals Synthesis, characterization and antimicrobial activity of Mn(II), Co(II) and Ni(II) complexes with schiff base derived from 4-chloroaniline and salicylaldehyde

2018 ◽  
Vol 11 (1) ◽  
pp. 61-66
Author(s):  
A.K. Ibrahim ◽  
B.A. Yusuf ◽  
B.U. Sambo
Keyword(s):  
Antimicrobial Activity ◽  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Metal Complexes ◽  
Infrared Spectra ◽  
Free Ligand ◽  
Conductivity Measurement ◽  
Moderate Activity ◽  
Ligand Ratio ◽  
Metal Ligand

Transition Metal Complexes of Mn(II),Co(II) and Ni(II) with Schiff base derived from 4- chloroaniline and Salicylaldehyde were synthesized and characterized by conductivity measurement, magnetic susceptibility, infrared spectra, metal-ligand ratio determination and solubility test. The Schiff base and its metal complexes were tested for antibacterial activity against Staphylococcus aureus and Escherichia coli and fungal activity against Aspergillus flavus and Mucor species. The low molar conductance values range (16-28.1Ohm- cm2 mol-1) indicated that all the complexes are non electrolytes. The magnetic susceptibility revealed that all the complexes are paramagnetic in nature. The metal-ligand ratio was found to be 1:2 in all the complexes. The infrared spectra suggested that the Schiff base behaves as a bidentate ligand. The antimicrobial studies revealed moderate activity against the tested organism when compared with the standards (Ciprofloxacin and Ketoconazole), and this activity increases by increasing concentration. And also the Metal Complexes showed higher activity than free Ligand due to chelation.Keywords: Salicyldehyde, 4-chloroaniline, Mn(II), Co(II), Zn(II) complexes, antimicrobial activity

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