Interferometric investigation of the effects, on the refractive index of PVA, of doping with lead acetate and gamma irradiation

El-Zaiat, S.Y.; El-Ghandoor, H.; Sharaf, F.

doi:10.1016/s0030-3992(96)00059-x

Cited by 21 publications

(8 citation statements)

References 4 publications

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“…PVA is one of the most important polymeric materials because it has many optical uses that result from its lack of color, its clarity, and its high transmittance 27–35. Figure 5 shows the transmittance spectra of pure PVA and PVA/gelatin blend films of different compositions.…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of poly(vinyl alcohol) and gelatin blend films

Pawde

Deshmukh

Parab

2008

J of Applied Polymer Sci

110

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Poly(vinyl alcohol) (PVA) is a water-soluble polymer that has been studied intensively because of several interesting physical properties that are useful in technical applications, including biochemical and medical applications. In this article, we report the effects of the addition of gelatin on the optical, microstructural, thermal, and electrical properties of PVA. Pure and PVA/gelatin blend films were prepared with the solution-casting method. These films were further investigated with Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), ultraviolet-visible (UV-vis) spectroscopy, and dielectric measurements. The FTIR spectrum shows a strong chemical interaction between PVA and gelatin molecules with the formation of new peaks. These peaks are due to the presence of gelatin in the blend films. The DSC results indicate that the addition of gelatin to PVA changes the thermal behavior, such as the melting temperature of PVA, and this shows that the blends are compatible with each other. This also shows that the interaction of gelatin and PVA molecules changes the crystallite parameters and the degree of crystallinity, and this supports the XRD results. The UV-vis optical study also reflects the formation of the complex and its effect on the microstructure of the blend film. Moreover, the addition of gelatin also gives rise to changes in the electrical properties of PVA/gelatin blend films.

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Section: Resultsmentioning

confidence: 99%

Preparation and characterization of poly(vinyl alcohol) and gelatin blend films

Pawde

Deshmukh

Parab

2008

J of Applied Polymer Sci

110

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“…Attention has been focused on poly(vinyl alcohol) (PVA) for more than 40 years because of its unique chemical and physical properties as well as its industrial applications 1–9. The optical uses of PVA are concerned with the retardation, polarization, and filtration of light and with photography and related imaging fields.…”

Section: Introductionmentioning

confidence: 99%

Sensing Chiral Drugs by Using CdSe/ZnS Nanoparticles Capped with N‐Acetyl‐L‐Cysteine Methyl Ester

Delgado-Pérez

Bouchet

Guárdia

et al. 2013

Chemistry A European J

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Chiral quantum dots (QDs), differing in their core or shell size and, consequently, in their optical properties, were synthesized by the treatment of commercially available amine-capped quantum dots with methyl ester N-acetyl-L-cysteine (CysP). Interestingly, their colloidal methanol solutions remain stable for several months. Their NMR and IR spectra were in accordance with CysP binding to the QD surface through two anchoring groups; its thiolate (strongly bound) and the carbonyl group of its ester (weaker bound) group, whereas their circular dichroism (CD) spectra showed a new broad redshifted band, suggesting that the attachment to the QD surface modified the conformational equilibrium towards conformer(s) with optical activity in this region. These QDs were sufficiently fluorescent to perform studies of the chiral recognition of drugs, in particular the aryl propionic acids (APAs) ketoprofen (KP), naproxen (NP), flurbiprofen (FP), and ibuprofen (IP). We used different drug concentration ranges, depending on the QD solubility. All the assayed drugs quenched the QD emission in a concentration-dependent mode. Quenching fluorescence assays with the chiral QDs (CS@CysP) showed their extraordinary capacity for the chiral recognition of KP, NP, and FP, and particularly in the case of KP and FP, a remarkable positive allosteric effect was detected for the R enantiomer. By using a drug/CS@CysP molar ratio of 5000:1 and 2500:1, the changes of intensity and the sign of the CD spectrum of the drug evidenced the dissociation of the drug carboxylic group in the presence of the QD.

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“…Attention has been focused on poly(vinyl alcohol) (PVA) for more than 40 years because of its unique chemical and physical properties as well as its industrial applications. [1][2][3][4][5][6][7][8][9] The optical uses of PVA are concerned with the retardation, polarization, and filtration of light and with photography and related imaging fields.…”

Section: Introductionmentioning

confidence: 99%

Preparation of poly(vinyl alcohol) films with promising physical properties in comparison with commercial polyethylene film

El-Kader

Hamied

2002

J of Applied Polymer Sci

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Poly(vinyl alcohol) (PVA) films with different thicknesses (0.08, 0.2, 0.23, 0.42 mm) were prepared by a casting technique. The transmission and the absorption of the PVA films were measured as functions of the wavelengths. PVA film with a thickness of 0.42 mm showed zero transmission in the wavelength range of 190 -350 nm. The transmission spectrum of a commercial polyethylene film with a thickness of 0.21 mm was compared to the transmission spectrum of PVA film with a thickness of 0.42 mm. A correlation was found between the two transmission spectra in the region 190 -350 nm and a 20% increase in the transmission of the PVA film in comparison with the transmission of commercial polyethylene in the region 350 -1500 nm. The near-infrared region of the transmission of commercial polyethylene was increased by 15% with respect to the transmission of the PVA film. The stress-strain measurements were done for PVA and commercial polyethylene films. The Young's modulus and the strength at break for PVA films are higher by two orders of magnitude than those for commercial polyethylene film. The strain at break for commercial polyethylene is 17% lower than that for PVA film. Radiation effects on the optical properties of PVA and commercial polyethylene films were investigated. The PVA and commercial polyethylene films were irradiated with a xeon arc lamp at 3.5-5 W/cm 2 . The optical properties for PVA and commercial polyethylene films were studied after irradiation. The obtained results showed that PVA film with a thickness of 0.42 mm gave promising properties which could be used in technological applications.

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Interferometric investigation of the effects, on the refractive index of PVA, of doping with lead acetate and gamma irradiation

Cited by 21 publications

References 4 publications

Preparation and characterization of poly(vinyl alcohol) and gelatin blend films

Preparation and characterization of poly(vinyl alcohol) and gelatin blend films

Sensing Chiral Drugs by Using CdSe/ZnS Nanoparticles Capped with N‐Acetyl‐L‐Cysteine Methyl Ester

Preparation of poly(vinyl alcohol) films with promising physical properties in comparison with commercial polyethylene film

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