scholarly journals Stress Relaxation of Thermo-Reversible Gels. Polyvinyl Alcohol–Congo Red–Water System

1959 ◽  
Vol 32 (11) ◽  
pp. 1248-1251 ◽  
Author(s):  
Kiyoshi Arakawa
Keyword(s):  
Stress Relaxation ◽  
Polyvinyl Alcohol ◽  
Congo Red ◽  
Water System

Polyvinyl alcohol gelling systems. I. Congo red and related dyes

1955 ◽  
Vol 18 (88) ◽  
pp. 275-298 ◽  
Author(s):  
C. Dittmar ◽  
W. J. Priest
Keyword(s):  
Polyvinyl Alcohol ◽  
Congo Red

scholarly journals Amyloids, Congo red and the apple-green effect

2019 ◽  
Author(s):  
Anna Jagusiak ◽  
Joanna Rybarska ◽  
Leszek Konieczny ◽  
Barbara Piekarska ◽  
Barbara Stopa ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Congo Red ◽  
Amyloid Fibril ◽  
Polarized Light ◽  
Electron Delocalization ◽  
Supramolecular Organization ◽  
Spectral Variability ◽  
Spectral Changes ◽  
Strong Capacity ◽  
Nonlinear Increase

This paper attempts to find evidence of the previously proposed opinion that amyloids complex with Congo red molecules which preserve their supramolecular organization. As evidence of the overpowering tendency of Congo red molecules to self-assemble, we present an increasing acidity of molecules that follows increasing concentration of the dye, and a highly notable nonlinear increase in absorbance in the UV band (300–400 nm). This effect is analyzed in a model where the amyloid fibril is simulated by polyvinyl alcohol, providing a scaffold to stabilize a long Congo red micelle. Enormous absorbance in the UV band, coupled with the increasing association capabilities of individual Congo red molecules may cause the absorbance to extend even into the visible band. In addition, the UV and visual absorbance bands shift significantly, depending on conditions, and may either approach or recede from each other, leading to spectral changes which may be observed under polarized light. This commonly observed spectral variability appears to be associated with the strong capacity for electron delocalization in supramolecular Congo red complexed with amyloids.

Synthesis of chitosan/polyvinyl alcohol/zeolite composite for removal of methyl orange, Congo red and chromium(VI) by flocculation/adsorption

2017 ◽  
Vol 157 ◽  
pp. 1568-1576 ◽  
Author(s):  
Umma Habiba ◽  
Tawsif A. Siddique ◽  
Tan Chin Joo ◽  
Areisman Salleh ◽  
Bee Chin Ang ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Polyvinyl Alcohol ◽  
Congo Red ◽  
Chromium Vi ◽  
Zeolite Composite

Efficient removal of Congo red dye from aqueous solution by adsorbent films of polyvinyl alcohol/melamine-formaldehyde composite and bactericidal effects

2020 ◽  
Vol 255 ◽  
pp. 120062 ◽  
Author(s):  
Shahnawaz Ahmad Bhat ◽  
Fahmina Zafar ◽  
Aftab Hossain Mondal ◽  
Azar Ullah Mirza ◽  
Qazi Mohd Rizwanul Haq ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Polyvinyl Alcohol ◽  
Congo Red ◽  
Melamine Formaldehyde ◽  
Efficient Removal ◽  
Congo Red Dye ◽  
Bactericidal Effects ◽  
Red Dye

Changes in morphology and optical properties of polyvinyl alcohol foils induced by Congo red dye concentration and stretching degree

2014 ◽  
Vol 34 (4) ◽  
pp. 345-351 ◽  
Author(s):  
Carmen Beatrice Zelinschi ◽  
Iuliana Stoica ◽  
Dana Ortansa Dorohoi
Keyword(s):  
Optical Properties ◽  
Polyvinyl Alcohol ◽  
Congo Red ◽  
Order Parameter ◽  
Three Dimensional ◽  
Morphological Properties ◽  
Degree Of Crystallinity ◽  
Texture Parameters ◽  
Before And After ◽  
Red Dye

Abstract To establish correlations between the optical and morphological properties of anisotropic polyvinyl alcohol (PVA) foils containing Congo red (CR) dye in various concentrations, characteristics such as degree of crystallinity, dichroic ratio, order parameter, birefringence, surface morphology, and three-dimensional texture parameters were estimated before and after stretching. An increase in morphological and optical anisotropy with the degree of stretching has been evidenced for both pure and CR-containing PVA foils, this behavior being facilitated by the presence of the dye. The study of these properties lays the foundation for understanding the circumstances in which PVA foils containing CR can be used as polarizing filters.

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