scholarly journals MODIFICATION OF THE SURFACE PHYSICO-CHEMICAL PROPERTIES OF POLYVINYL ALCOHOL. THE EFFECT OF IMPLANTATION OF SILVER IONS, ELECTRON AND PLASMA PROCESSING

2018 ◽  
Author(s):  
O. A. Laput' ◽  
I. V. Vasenina ◽  
K. P. Savkin ◽  
D. A. Zuza ◽  
I. A. Kurzina
Keyword(s):  
Polyvinyl Alcohol ◽  
Plasma Processing ◽  
Chemical Properties ◽  
Silver Ions ◽  
Physico Chemical ◽  
Modification Of The Surface

Decomposition of hydrogen peroxide on nickel-silver two-component catalyst

1984 ◽  
Vol 49 (10) ◽  
pp. 2222-2230 ◽  
Author(s):  
Viliam Múčka ◽  
Rostislav Silber
Keyword(s):  
Hydrogen Peroxide ◽  
Chemical Properties ◽  
Silver Ions ◽  
Surface Concentration ◽  
Chloride Ions ◽  
Nickel Silver ◽  
Silver Catalysts ◽  
Physico Chemical ◽  
Low Degree ◽  
Defective Crystal

The catalytic and physico-chemical properties of low-temperature nickel-silver catalysts with nickel oxide concentrations up to 43.8% (m/m) are examined via decomposition of hydrogen peroxide in aqueous solution. The mixed catalysts prepared at 250°C are composed of partly decomposed silver carbonate or oxide and nickel carbonate or hydroxide decomposed to a low degree only and exhibiting a very defective crystal structure. The activity of these catalysts is determined by the surface concentration of silver ions, which is affected by the nickel component present. The latter also contributes to the thermal stability of the catalytic centres of the silver component, viz. the Ag+ ions. The concentration of these ions varies with the temperature of the catalyst treatment, the activity varies qualitatively in the same manner, and the system approaches the Ag-NiO composition. The catalytic centres are very susceptible to poisoning by chloride ions. A previous exposition of the catalyst to a gamma dose of 10 kGy from a 60Co source has no measurable effect on the physico-chemical properties of the system.

Certain correlations between the physico-chemical properties and breaking characteristics of polyvinyl alcohol fibers

1972 ◽  
Vol 5 (2) ◽  
pp. 289-290
Author(s):  
O. S. Lilenkov ◽  
B. M. Pugach ◽  
L. E. Utevskii ◽  
Z. Yu. Chereiskii
Keyword(s):  
Polyvinyl Alcohol ◽  
Chemical Properties ◽  
Physico Chemical

Physico-chemical properties of keratin-polyvinyl alcohol composite

2015 ◽  
Vol 16 (3) ◽  
pp. 537-542 ◽  
Author(s):  
A. Abou El-Kheir ◽  
C. Popescu ◽  
S. Mowafi ◽  
M. Salama ◽  
H. El-Sayed
Keyword(s):  
Polyvinyl Alcohol ◽  
Chemical Properties ◽  
Physico Chemical

Physico-chemical properties of biodegradable films of polyvinyl alcohol/sago starch for food packaging

2019 ◽  
Vol 16 ◽  
pp. 1819-1824 ◽  
Author(s):  
F.F. Hilmi ◽  
M.U Wahit ◽  
N.A Shukri ◽  
Z. Ghazali ◽  
A.Z. Zanuri
Keyword(s):  
Polyvinyl Alcohol ◽  
Food Packaging ◽  
Chemical Properties ◽  
Sago Starch ◽  
Biodegradable Films ◽  
Physico Chemical

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

Physico-Chemical Properties of Recombinant Desulphatohirudin

1990 ◽  
Vol 63 (03) ◽  
pp. 499-504 ◽  
Author(s):  
A Electricwala ◽  
L Irons ◽  
R Wait ◽  
R J G Carr ◽  
R J Ling ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Gel Filtration ◽  
Chemical Properties ◽  
Alpha Helix ◽  
Apparent Molecular Weight ◽  
Correlation Spectroscopy ◽  
Nmr Studies ◽  
Recombinant Hirudin ◽  
Physico Chemical ◽  
Recombinant Molecule

SummaryPhysico-chemical properties of recombinant desulphatohirudin expressed in yeast (CIBA GEIGY code No. CGP 39393) were reinvestigated. As previously reported for natural hirudin, the recombinant molecule exhibited abnormal behaviour by gel filtration with an apparent molecular weight greater than that based on the primary structure. However, molecular weight estimation by SDS gel electrophoresis, FAB-mass spectrometry and Photon Correlation Spectroscopy were in agreement with the theoretical molecular weight, with little suggestion of dimer or aggregate formation. Circular dichroism studies of the recombinant molecule show similar spectra at different pH values but are markedly different from that reported by Konno et al. (13) for a natural hirudin-variant. Our CD studies indicate the presence of about 60% beta sheet and the absence of alpha helix in the secondary structure of recombinant hirudin, in agreement with the conformation determined by NMR studies (17)

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