THE STANDARDIZATION OF A MODIFIED OSTWALD VISCOMETER

1930 ◽  
Vol 52 (9) ◽  
pp. 3493-3507 ◽  
Author(s):  
H. M. Chadwell ◽  
B. Asnes
Keyword(s):  
Ostwald Viscometer

Automatic Version of Ostwald Viscometer for Conductive Liquids

2021 ◽  
Vol 64 (2) ◽  
pp. 327-330
Author(s):  
Indu Saxena ◽  
Vijay Kumar
Keyword(s):  
Ostwald Viscometer

The Automatic Timing of the Ostwald Viscometer by Means of a Photoelectric Cell

Physics ◽  
1933 ◽  
Vol 4 (6) ◽  
pp. 215-224 ◽  
Author(s):  
Grinnell Jones ◽  
S. K. Talley
Keyword(s):  
Photoelectric Cell ◽  
Ostwald Viscometer

A modified Ostwald viscometer

1973 ◽  
Vol 50 (3) ◽  
pp. 194
Author(s):  
Biswanath Bhattacharyya ◽  
Dilip Majumdar
Keyword(s):  
Ostwald Viscometer

A viscometric study of the breakdown of casein in milk by rennin and rennet

1961 ◽  
Vol 28 (2) ◽  
pp. 165-173 ◽  
Author(s):  
G. W. Scott Blair ◽  
J. C. Oosthuizen
Keyword(s):  
Intrinsic Viscosity ◽  
Order Term ◽  
Specific Viscosity ◽  
Reduced Viscosity ◽  
Reaction Constant ◽  
Zero Order Reaction ◽  
Straight Lines ◽  
Viscometric Study ◽  
Considerable Range ◽  
Ostwald Viscometer

SummaryIn the later stages of the reaction between rennin and casein drastic viscometric methods are undesirable, but in the first stages there is a fall in viscosity which may be satisfactorily measured in an Ostwald viscometer. Using fat-free milk, the viscosity at first falls linearly with time. At low rennet concentrations (Ce) this may be said to constitute a zero-order reaction (constant k0). At higher rennet concentrations and after longer times, the reaction passes to first order (constant k1). After very long times it doubtless becomes more complex.The values of k0 are proportional, over a considerable range, to the milk concentration (Cm), those of k1 being independent of Cm.For pure rennin k0 and k1 are proportional to Ce, but for commercial rennets they vary as a power (N) of Ce and the value of N appears to measure the rennin purity. The potentialities of the method for assessing rennet activities are also discussed.If the reduced viscosity (specific viscosity÷Cm) of fat-free milks is plotted against Cm, good straight lines are obtained which may be extrapolated to zero concentration to give a reliable value of intrinsic viscosity. The intrinsic viscosity falls progressively during the protein breakdown process but the slope of the curves (‘second order term’) remains unchanged.

The effects on flow time of tilting an Ostwald viscometer

1965 ◽  
Vol 42 (5) ◽  
pp. 317-321 ◽  
Author(s):  
N H Langton ◽  
P Vaughan
Keyword(s):  
Flow Time ◽  
Ostwald Viscometer

scholarly journals Effect of Solvents on the Ultrasonic Velocity and Acoustic Parameters of Polyvinylidene Fluoride Solutions

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
S. S. Kulkarni ◽  
U. V. Khadke
Keyword(s):  
Ultrasonic Velocity ◽  
Polyvinylidene Fluoride ◽  
Ultrasonic Attenuation ◽  
Adiabatic Compressibility ◽  
Free Path Length ◽  
Solvent Mixtures ◽  
Acoustic Parameters ◽  
Effect Of Solvents ◽  
Molecular Behavior ◽  
Ostwald Viscometer

Ultrasonic studies provide a wealth of information in understanding the molecular behavior and intermolecular interaction of polymer solvent mixtures. Attempts were made to measure ultrasonic velocity, density, and viscosity for the mixture of polyvinylidene fluoride (PVDF) in acetone and dimethylformamide (DMF) of various stoichiometric ratios at 300 K using crystal controlled ultrasonic interferometer (Mittal make), pyknometer (specific gravity bottle), and Ostwald viscometer, respectively. The acoustic parameters adiabatic compressibility (β), intermolecular free path length (Lf), acoustic impedance (Z), relative association (RA), ultrasonic attenuation (α/f2), and relaxation time (τ) have been estimated using experimental data with well-known techniques. The variation of these acoustic parameters is explained in terms of solute-solvent molecular interaction in a polymer solution.

scholarly journals Biomass index and viscosity values of Moringa oleifera that influenced by Enterococcus faecalis

2021 ◽  
Vol 6 (1) ◽  
pp. 1-5
Author(s):  
Cut SORAYA ◽  
Zulfan M. ALIBASYAH ◽  
Basri A. GANI
Keyword(s):  
Enterococcus Faecalis ◽  
Moringa Oleifera ◽  
Viscosity Index ◽  
Infectious Agent ◽  
Ethanol Extract ◽  
High Viscosity ◽  
Assay Method ◽  
Moringa Oleifera Leaves ◽  
Better Than ◽  
Ostwald Viscometer

ABSTRACT Enterococcus faecalis (E. faecalis) has been reported as the primary infectious agent in rootcanals. Moringa oleifera (M. oleifera) is said to have the ability to prevent the development of E. faecalis.The purpose of this study was to measure the biomass index and viscosity of the ethanol extract ofMoringa (Moringa oleifera) leaves, which were affected by E. faecalis. This study used Moringa oleiferaand E. faecalis. The biomass index of Moringa oleifera extracts using the Biomass Assay method and theviscosity with the Ostwald Viscometer. The biomass index of M. oleifera affected by E. faecalis at aconcentration of 12.5% for 48 hours was better than other concentrations. CHX has a perfect biomassindex at 24 hours, while at 48 hours, the biomass index increases to close to 10%. Meanwhile, M. oleiferahas a high viscosity at a concentration of 12.5% (0.81 Cp). The results of the viscosity examination werein line with the biomass index with a positive correlation (0.92) and p0.05 between the M. oleiferaconcentrations between the two treatments. M. oleifera has very good biomass and viscosity index at aconcentration of 12.5%. Both are determinants of the development of E. faecalis under the influence of M.oleifera.KEYWORDS bomassa indek, viskositas, E. faecalis

scholarly journals SEDIMENTATION AND VISCOSITY STUDIES ON THE CAPSULAR AND SOMATIC POLYSACCHARIDES OF PNEUMOCOCCUS TYPE III

1955 ◽  
Vol 1 (2) ◽  
pp. 93-98 ◽  
Author(s):  
Virgil L. Koenig ◽  
J. D. Perrings
Keyword(s):  
Molecular Weight ◽  
Infinite Dilution ◽  
Capsular Polysaccharide ◽  
Capsular Polysaccharides ◽  
Type Iii ◽  
Molecular Weights ◽  
Pneumococcus Type ◽  
Ostwald Viscometer

Sedimentation constants at infinite dilution have been found to be 1.89 and 4.06 for the somatic and capsular polysaccharides, respectively, from pneumococcus Type III. Intrinsic viscosities have been determined for the somatic and capsular polysaccharides of pneumococcus Type III using the Ostwald viscometer. Molecular weights and dimensions have been calculated for the somatic and capsular polysaccharides of pneumococcus Type III assuming the molecules to be prolate ellipsoids of revolution. Values for the somatic polysaccharide are: molecular weight, 26,400; diameter, 0.97 mµ; and length, 36.18 mµ. Values for the capsular polysaccharide are: molecular weight, 171,800; diameter, 1.04 mµ; and length, 177.87 mµ. The molecular weights were calculated for the somatic and capsular polysaccharides of pneumococcus Type III assuming the molecules to be flexible chains. The value of the molecular weight of the somatic polysaccharide is 31,500 and the value for the molecular weight of the capsular polysaccharide is 267,500. The molecules of both the somatic and capsular polysaccharides exhibit high degrees of asymmetry.

scholarly journals Preparation of Poly (N-4-Antipyrinyl or Procainyl Methyl Nadamic Acids) as Drug Polymers

2014 ◽  
Vol 5 (1) ◽  
pp. 42-53
Author(s):  
Dr. Firyal M. Ali AL-Salami ◽  
Abbas N. M. AL-Sharify ◽  
Khudheyer Jawad Kadhem
Keyword(s):  
Room Temperature ◽  
Uv Spectroscopy ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Release Rates ◽  
Ph Values ◽  
Ft Ir ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Ostwald Viscometer

Two new monomers of N-4-antipyrinyl methyl nadamic acid M1 and N-Procaienyl methyl nadamic acid M2 were synthesized from reaction of 4-Aminoantipyrine or procaine with methyl nadic anhydride at room temperature with dioxane as a solvent. The prepared monomers M1 and M2 were polymerized free radically with AIBN as initiator to corresponding polyamic acids P1 and P2, Which were converted to their sodium salt polymers P3 and P4 to enhanced their solubility's in water. The physical and chemical properties were studied for monomers and polymers, also FT-IR ,1H-NMR  and UV. Spectroscopy was characterized of M1or M2. The intrinsic viscosity was measured by  Ostwald viscometer at 30 0C  .The swelling %was measured and the controlled release rates of drug polymers were studied in different pH values at 37 0C.

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