Dehydration Sensing of a Polyvinyl Alcohol Film via Plasmonic Nanoparticles

MRS Advances ◽  
2019 ◽  
Vol 4 (5-6) ◽  
pp. 299-304
Author(s):  
Milana O. Lisunova
Keyword(s):  
Refractive Index ◽  
Polyvinyl Alcohol ◽  
Real Time ◽  
Rate Constant ◽  
Vinyl Alcohol ◽  
Plasmonic Nanoparticles ◽  
Poly Vinyl Alcohol ◽  
Dehydration Rate ◽  
Polyvinyl Alcohol Film

ABSTRACTIn situ, real-time monitoring of a dehydration of poly(vinyl alcohol) (PVA) film is researched. The technique based on the incorporation plasmonic nanocages (NCs) between the two identical layers of PVA, (PVA)/NCs/(PVA) film, and its sensitivity to the variation of the refractive index of the surrounding PVA film via desorption water. The dehydration time increases from 180 (s) to 1800 (s) as the content of the PVA in the films increases twice, from (PVA)/NCs/(PVA) to (PVA)2/NCs/(PVA)2. Such effect could be explained by different rate of the molecules desorption from the PVA based films. Specifically, the dehydration rate is of 0.22 (vol% per s) and 0.026 (vol% per s) for (PVA)/NCs/(PVA) and (PVA)2/NCs/(PVA)2 films, respectively. The dehydration rate constant reduces from -50×10-4 (s-1) to -4.3 ×10-4 (s-1) as the content of PVA increases from (PVA)/NCs/(PVA) to (PVA)2/NCs/(PVA)2 films, respectively.

Isomerization of Diphenyl Polyenes. Part III. Absorption and Fluorescence Properties of 1,4-Diphenyl-1,3-butadiene in Poly(vinyl alcohol) Film

1992 ◽  
Vol 47 (12) ◽  
pp. 1204-1210 ◽  
Author(s):  
A. Kawski ◽  
B. Kukliński ◽  
A. Kubicki ◽  
I. Gryczyński
Keyword(s):  
Quantum Yield ◽  
Polyvinyl Alcohol ◽  
Vinyl Alcohol ◽  
Wavelength Region ◽  
Fluorescence Properties ◽  
Effect Of Temperature ◽  
Poly Vinyl Alcohol ◽  
Trans Form ◽  
Long Wavelength ◽  
Polyvinyl Alcohol Film

The effect of temperature on the absorption and fluorescence properties of 1,4-diphenyl-1,3-butadiene (DPB) in polyvinyl alcohol) film (PVA) was investigated in the range from 293 to 423 K. Upon heating above 353 K, the optical density in the long wavelength region (at 339 nm) increases five times only, whereas for 1,6-diphenyl-1,3,5-hexatriene (DPH) and 1,8-diphenyl-1,3,5,7-octatetraene (DPO) ten and twenty times, respectively. However, the total quantum yield (ΦF = 0.68) at 293 K is greater than that for the trans-trans form (ΦF = 0.63) and decreases with growing temperature. Both this effect and broadening effect in the fluorescence band at 293 K evidence the existence of two emission centres, i.e. the trans-trans and cis-trans conformers.

Photoinduced dichroism and birefringence in films of Mordant Pure Yellow/poly(vinyl alcohol): simultaneous real-time investigations at two wavelengths

1994 ◽  
Vol 26 (11) ◽  
pp. 1013-1018 ◽  
Author(s):  
M. Ivanov ◽  
L. Nikolova ◽  
T. Todorov ◽  
N. Tomova ◽  
V. Dragostinova
Keyword(s):  
Real Time ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol

scholarly journals Photoselection of Luminescent Molecules in Anisotropic Media in the Case of Two-Photon Excitation. Part II. Experimental Studies of Hoechst 33342 in Stretched Polyvinyl alcohol) Films

1996 ◽  
Vol 51 (9) ◽  
pp. 1037-1041 ◽  
Author(s):  
A. Kawski ◽  
Z. Gryczyński ◽  
I. Gryczyński ◽  
J. R. Lakowicz ◽  
G. Piszczek
Keyword(s):  
Polyvinyl Alcohol ◽  
Vinyl Alcohol ◽  
Experimental Studies ◽  
Poly Vinyl Alcohol ◽  
Hoechst 33342 ◽  
Emission Anisotropy ◽  
Two Photon ◽  
Photon Excitation ◽  
Polyvinyl Alcohol Films ◽  
Two Photon Excitation

Abstract It was found by investigating dichroism and emission anisotropy in the case of one-and two-photon excitation of Hoechst 33342 [bis-benzimide,2,5'-bi-1H-benzimidazole, 2'-(4-ethoxyphenyl)-5-5(4-methyl-1-piperazinyl)] in stretched poly(vinyl alcohol) (PVA) films, that the absorption and fluorescence transition moments lie along the long molecular axis of the molecule studied. The slight deviation of the transition moment direction in fluorescence (about 8°) from that in absorption can be due to the incomplete linearity of the Hoechst molecule.

scholarly journals In Situ Preparation and Properties of Poly(vinyl alcohol)/Carboxymethyl Chitosan/Cyanidin Hydrogel Films

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Xiaojuan Zhang ◽  
Wenbin Cai ◽  
Lingyun Hao ◽  
Wei Zhang
Keyword(s):  
Vinyl Alcohol ◽  
Encapsulation Efficiency ◽  
Umbilical Vein ◽  
Antibacterial Activities ◽  
Carboxymethyl Chitosan ◽  
Poly Vinyl Alcohol ◽  
In Situ Preparation ◽  
Umbilical Vein Endothelial Cells ◽  
Hydrogel Films

This study synthesized poly(vinyl alcohol)/carboxymethyl chitosan/cyanidin (PVA/CMCS/CY) hydrogel films. First, PVA and CMCS were used to synthesize hydrogel films by ultraviolet irradiation. Meanwhile, CY was in situ combined into the hydrogel films through the electrostatic attraction between CMCS and CY. Next, the products were analyzed using Fourier-transform infrared spectroscopy, scanning electron microscopy, contact angle test, swelling analysis, and mechanical property test. The results revealed that compared with PVA/CMCS hydrogel films, the PVA/CMCS/CY hydrogel films had an interporous structure and good swelling and mechanical properties. Moreover, the drug release experiments demonstrated that the PVA/CMCS/CY hydrogel films had a CY encapsulation efficiency of 33.5% with a sustained CY release of up to 60 h. Furthermore, the examined antibacterial activities against Staphylococcus aureus and Escherichia coli showed that the porous PVA/CMCS/CY hydrogel films exhibited a certain inhibition. Cell viability experiments demonstrated that the PVA/CMCS/CY films displayed no obvious cytotoxicity to human umbilical vein endothelial cells.

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