Viscosity of Deuterium Oxide and Water from 5° to 125°C

Hardy, Robert C.; Cottington, R. L.

doi:10.1063/1.1747310

Cited by 53 publications

(39 citation statements)

References 4 publications

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“…The values given in table 21 for the results with the capillary pair The mean of these values is 0.010019 , which is the same as was obtained in the calculations with the capillaries in pairs. Although the assump tion that n = O results in better over-all agreement in the calculated values of th e viscosity, th e measuremen ts are so insensitive for th e evaluation of n, t hat no accurate conclusions may be reached as to its magnitude.…”

Section: 1 Generalsupporting

confidence: 66%

“…At 20° C, D 20 is about 1.245 times as viscous as H 20 [21], and consequently th e deuterium content in the water used must be considered. Fortunately, surveys (for example, [22] have shown that the variation in the isotopic concentration in water from a variety of world-wid e sources is only a few parts p er million.…”

Section: 3 Application In Practical Viscometrymentioning

confidence: 99%

“…The electric resistance, R, of a cylindrical conductor of length l , radius r, and resistivity p is given by (21) As the resistivity of m ercury is accurately kn6wn , eq 21 affords a m eans of calculating the mean crosssectional area of the bore of a capillary.…”

mentioning

confidence: 99%

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Absolute viscosity of water at 20-degrees-C

Swindells¹,

Coe²,

Godfrey³

1952

J. RES. NATL. BUR. STAN.

175

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An accurafu knowl edge of t he viscos it ies of liquids in absolute units is of fundamental importance in man y scient ifi c fi elds. Th e meas urement of t hese viscosities is almost universally based upon the absolute viscos ity of water at 20° C as a primary standard. During t he past 50 years t here has been an in creasing need for a more accurate d eterminat ion of t his s tandard. Consequen t ly, with t he coopera tion of t he Society of Rheology and so me financial assistance from t he Chemical Foundation , this proj ect was undert aken by t he National Bureau of Standards and has now been completed.Th e determination was made by t he method of capillary fiow. By means of a calibrated i nj ector, va riou s known constan t rates of flow were prod~c e d in capillaries of m eas ured dim ensions and obser vations were made of the co rrespondmg press ure drops through t he capillari es.' Th e eff ects of t he ends of t he capillaries were r endered negligible by t he s imu ltan eo us t reatment of da ta obt ained with pairs of capi llaries having essent ia lly t he same diam eters but differen t lengths.The value found for t he viscos ity of water is 0.010019 poise as co mpared wi th 0.01005 poise, which has generally been accepted for t he past 30 years. Th e estimated accuracy o f t he !lew determination is ± 0.000003 poise.As a r es ult of this work, begin nin g 0 11 JIIly 1, 1952, the Nat ional Bureau of Standards is plannin g to use t he value 0.01002 poise for t he absolu te v iscos ity of wa:ter at 20° C a s t he basis for the calibrat ion of viscometers and standard-sample otis. It] S r eco mm end ed t hat other laboratories adopt t his value as t he primary refere nce standard for co mparative m eas urem ents of viscosity.

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Section: 1 Generalsupporting

confidence: 66%

Section: 3 Application In Practical Viscometrymentioning

confidence: 99%

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Absolute viscosity of water at 20-degrees-C

Swindells¹,

Coe²,

Godfrey³

1952

J. RES. NATL. BUR. STAN.

175

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“…4 The value of τ, of the SL-spin group in N-HEWL is somewhat smaller than that in D-HEWL (Table III). Recalling that the viscosity of D20 is 25% larger than that of 1120 [37], the two values of τ, may be considered to be in agreement.…”

Section: T1 Dispersionmentioning

confidence: 75%

Proton and Deuteron Relaxation Study of Molecular Dynamics in Lysozyme Solutions

et al. 2000

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A nuclear magnetic resonance spin-lattice relaxation dispersion study of the relaxation of several magnetization components in both natural and deuterated lysozyme solutions was undertaken at 20°C. Proton and deuteron resonances were employed. The two-dimensional time evolution of the magnetization and the spin-spin relaxation were analyzed. In addition, an isotopic dilution study was performed at 5 and 30.6 MHz. The results indicate that the water proton spin-lattice relaxation rate which arises from intermolecular relaxation between the water protons and the lysozyme protons represents a relatively strong relaxation mechanism. A model for the dynamics of the water molecules, consistent with the proton and deuteron dispersions as well as with the isotopic dilution results, is presented.

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“…From the Stokes-Einstein relation (D = kT/6pgr), a hydrodynamic radius of r = 16.7 Å was calculated, using the value of g = 1.2514 · 10 À3 Pa s for the viscosity of D 2 O [36]. A similar hydrodynamic radius has been estimated from dielectric relaxation data [37].…”

Section: Global Protein Diffusionmentioning

confidence: 99%