scholarly journals Modification of Surface Properties of Colloidal Suspensions of NixOy-SiO2 Mixed Oxides with Different Ni Contents by the Adsorption Layers of Poly(Vinyl Alcohol)

2020 ◽  
Author(s):  
M. Wiśniewska ◽  
S. Chibowski ◽  
T. Urban ◽  
G. Fijałkowska ◽  
M. Medykowska ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Mixed Oxide ◽  
Vinyl Alcohol ◽  
Mixed Oxides ◽  
Colloidal Suspensions ◽  
Surface Characteristics ◽  
Limited Range ◽  
Poly Vinyl Alcohol ◽  
Solution Interface ◽  
Adsorption Affinity

Abstract The adsorption and electrokinetic properties of hybrid silica materials composed of nickel and silicon oxides (NixOy-SiO2), characterized by different contents of nickel oxide (from 0.5 to 3 mmol/g SiO2), were examined. These solids were also modified by poly(vinyl alcohol) to change their surface characteristics. The polymer is non-toxic and very well soluble in water. Due to incomplete hydrolysis of the polymer acetate groups, its macromolecules become negatively charged. The limited range of studied pH (6–10) resulted from high solubility of nickel oxide at more acidic pH values. The spectrophotometric, surface charge and electrophoretic measurements indicated that PVA exhibits higher adsorption affinity for the surfaces of mixed oxide with a larger content of nickel in its structure. Moreover, the presence of polymeric layers on the solid surface influences considerably the structure of electrical double layer formed at the mixed oxide-aqueous solution interface.

scholarly journals Impact of poly(vinyl alcohol) adsorption on the surface characteristics of mixed oxide Mn x O y –SiO2

Adsorption ◽  
2015 ◽  
Vol 22 (4-6) ◽  
pp. 417-423 ◽  
Author(s):  
M. Wiśniewska ◽  
V. Bogatyrov ◽  
I. Ostolska ◽  
K. Szewczuk-Karpisz ◽  
K. Terpiłowski ◽  
...  
Keyword(s):  
Mixed Oxide ◽  
Vinyl Alcohol ◽  
Surface Characteristics ◽  
Poly Vinyl Alcohol ◽  
Alcohol Adsorption

Adsorption mechanism of poly(vinyl alcohol) at the mixed oxide Cu x O y –SiO 2 /aqueous solution interface

2015 ◽  
Vol 356 ◽  
pp. 905-910 ◽  
Author(s):  
M. Wiśniewska ◽  
V. Bogatyrov ◽  
K. Szewczuk-Karpisz ◽  
I. Ostolska ◽  
K. Terpiłowski
Keyword(s):  
Aqueous Solution ◽  
Mixed Oxide ◽  
Vinyl Alcohol ◽  
Adsorption Mechanism ◽  
Poly Vinyl Alcohol ◽  
Solution Interface

Formation of ultra-thin films consisting of proteins or polysaccharides and syndiotactic-rich poly-vinyl alcohol mixtures adsorbed at air-solution interface

1990 ◽  
Vol 268 (10) ◽  
pp. 968-971
Author(s):  
K. Yamaura ◽  
N. Kuranuki ◽  
K. Takeyama ◽  
M. Suzuki ◽  
T. Tanigami ◽  
...  
Keyword(s):  
Thin Films ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Solution Interface ◽  
Alcohol Mixtures

scholarly journals Preparation and characterization of new hydrogels based on poly(vinyl alcohol)/phosphoester — chondroitin sulphate

2013 ◽  
Vol 11 (3) ◽  
pp. 446-456
Author(s):  
Tachita Vlad-Bubulac ◽  
Diana Serbezeanu ◽  
Ana-Maria Oprea ◽  
Ionela-Daniela Carja ◽  
Corneliu Hamciuc ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Chondroitin Sulphate ◽  
Moisture Sorption ◽  
Kinetic Studies ◽  
Surface Characteristics ◽  
Poly Vinyl Alcohol ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Ft Ir

AbstractAbstract New polymer hydrogels based on partially phosphorylated poly(vinyl alcohol) (PVA/Phosphoester) have been prepared. Fourier transform infrared spectroscopy (FT-IR) was employed to confirm PVA/Phosphoester formation. Contact angle measurements were performed to evaluate the surface characteristics of the hydrogels. The PVA/Phosphoester hydrogels were co-networked with Chondroitin sulfate (CS) in various ratios by chemical crosslinking. The synthetic-natural mixed resulted semi-IPN hydrogels were structurally and morphologically investigated by ATR — FT-IR spectroscopy and scanning electron microscopy, respectively. The swelling behavior and dynamic moisture sorption capacity of the PVA/Phosphoester (p-methyl-phenyl phosphonic dichloride) (P3)-CS semi-IPN hydrogels were followed. It was found that the performance of the semi-IPN hydrogels was influenced by the CS. By kinetic studies, it has been shown that the swelling processes occurred by an anomalous transport mechanism. Graphical abstract

Effect of poly(acrylic acid) and poly(vinyl alcohol) on the solubility of colloidal BaTiO3 in an aqueous medium

2003 ◽  
Vol 18 (5) ◽  
pp. 1266-1274 ◽  
Author(s):  
Ungyu Paik ◽  
Vincent A. Hackley ◽  
Jaeho Lee ◽  
Sangkyu Lee
Keyword(s):  
Acrylic Acid ◽  
Vinyl Alcohol ◽  
Colloidal Stability ◽  
Dielectric Materials ◽  
Poly Vinyl Alcohol ◽  
Acidic Ph ◽  
Incongruent Dissolution ◽  
Solution Interface ◽  
Materials Used ◽  
Poly Acrylic Acid

The influence of poly(acrylic acid) (PAA) and poly(vinyl alcohol) (PVA) on Ba dissolution from the BaTiO3-aqueous solution interface was investigated. Incongruent dissolution of Ba impacts the colloidal stability, microstructure, and electrical properties of BaTiO3 and related perovskite dielectric materials used in the manufacture of ceramic capacitors. The solubility characteristics of BaTiO3 were influenced significantly by the presence of PAA and PVA. PAA, which forms weak monodentate complexes with Ba2+, acted as both a passivating and a sequestering agent, depending on pH. Both PAA and PVA provided some degree of passivation in the acidic pH region. Above pH 8, where BaTiO3 solubility decreases sharply, PVA had a moderate passivating effect, whereas solubility was enhanced by PAA with a positive linear dependence on concentration. The adsorptive and electrokinetic behavior of colloidal BaTiO3 with respect to PAA and PVA are correlated with the observed passivating and sequestering properties of these polymers.

scholarly journals Comparison of the Poly(vinyl alcohol) Adsorption Behaviour on the Mixed Oxides with Different Surface Structure

2016 ◽  
Vol 22 (2) ◽  
Author(s):  
Małgorzata WIŚNIEWSKA ◽  
Katarzyna SZEWCZUK-KARPISZ ◽  
Iwona OSTOLSKA ◽  
Konrad TERPIŁOWSKI ◽  
Dariusz STERNIK ◽  
...  
Keyword(s):  
Surface Structure ◽  
Vinyl Alcohol ◽  
Mixed Oxides ◽  
Poly Vinyl Alcohol ◽  
Adsorption Behaviour ◽  
Alcohol Adsorption

Atomic Force Microscopy Studies of the Film Surface Characteristics of Poly(vinyl acetate) Latexes Prepared with Poly(vinyl alcohol)

Langmuir ◽  
2003 ◽  
Vol 19 (23) ◽  
pp. 9968-9972 ◽  
Author(s):  
B. M. Budhlall ◽  
O. L. Shaffer ◽  
E. D. Sudol ◽  
V. L. Dimonie ◽  
M. S. El-Aasser
Keyword(s):  
Atomic Force Microscopy ◽  
Vinyl Acetate ◽  
Vinyl Alcohol ◽  
Film Surface ◽  
Surface Characteristics ◽  
Poly Vinyl Alcohol ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals THERMAL, MECHANICAL AND WATER SORPTION PROPERTIES OF XANTHAN-BASED COMPOSITE CRYOGELS

2020 ◽  
Vol 54 (9-10) ◽  
pp. 915-924
Author(s):  
IRINA ELENA RASCHIP ◽  
MARIA VALENTINA DINU ◽  
NICUSOR FIFERE ◽  
RALUCA DARIE-NITA ◽  
DANIELA PAMFIL ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Water Sorption ◽  
Surface Characteristics ◽  
Grape Pomace ◽  
Poly Vinyl Alcohol ◽  
Polyphenol Content ◽  
Natural Polyphenol ◽  
Red Grape ◽  
Water Sorption Capacity ◽  
Thermal Stability Of

The thermal, mechanical, rheological, and surface characteristics of some xanthan/poly(vinyl alcohol)/red grape pomace composite cryogels prepared by the freeze/thawing approach were investigated. The results were discussed in comparison with those obtained for individual xanthan or poly(vinyl alcohol) cryogel networks synthesized under the same conditions. The mechanical strength of the cryogels was enhanced by increasing the number of freeze/thawing cycles, and by the addition of a natural polyphenol (i.e. red grape pomace). The thermal stability of the poly(vinyl alcohol) in the blend significantly decreased upon the addition of 50% xanthan, while the presence of a single neat melting profile indicated good component miscibility for the chosen ratios. The water sorption capacity depended on the amount of polyphenol incorporated, thus the hydrophilicity of the cryogel films decreased with the increase of polyphenol content.

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