The calculation of true dipole moments form solutions in Polar Solvents

1953 ◽  
Vol 6 (4) ◽  
pp. 323 ◽  
Author(s):  
AD Buckingham
Keyword(s):  
Amino Acids ◽  
Dielectric Constant ◽  
Aqueous Solutions ◽  
Charge Separation ◽  
Dipole Moments ◽  
New Method ◽  
Electronic Charge ◽  
Polar Solvents

The theory presented in an earlier paper is here developed as a method for the evaluation of' true dipole moments from data obtained from solutions in polar solvents. As illustrations, the new method is applied to values relating to solutions of several substances in chloroform, chlorobenzene, and nitrobenzene. The results, considering the nature of the problem, are satisfactory. The accuracy is greatest when the solute is highly polar and the dielectric constant of the solvent small. Aqueous solutions of pyridine and of two amino acids are also considered. In the latter cases especially, the predicted dipole moments agree most favourably with anticipated values obtained for the zwitterions by multiplying the electronic charge by the expected charge separation.

Main Dielectric Dispersion Region of Mixtures of some Long-Chain Alcohols with Non-Polar Solvents

1972 ◽  
Vol 27 (8-9) ◽  
pp. 1363-1367 ◽  
Author(s):  
F. F. Hanna ◽  
I. K. Hakim
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Dipole Moments ◽  
Relaxation Times ◽  
Dielectric Dispersion ◽  
Concentrated Solutions ◽  
Polar Solvents ◽  
Dispersion Region ◽  
Long Chain

Abstract The dielectric constant ε' and dielectric loss ε" are measured for concentrated solutions of n-dodecanol and n-octanol with five non-polar solvents at five frequencies between 2 and 400 MHz at three temperatures between 20 and 60 °C. The effective dipole moments have been calculated and found to decrease with increasing dilution. The relaxation times of the concentrated solutions are lower than that of the pure alcohols, decrease with dilution and are dependent on the nature of the non-polar solvents.

Imaging polymers, proteins and dna in aqueous solutions with the atomic force microscope

1989 ◽  
Vol 47 ◽  
pp. 32-33
Author(s):  
S.A.C. Gould ◽  
B. Drake ◽  
C.B. Prater ◽  
A.L. Weisenhorn ◽  
S.M. Lindsay ◽  
...  
Keyword(s):  
Amino Acids ◽  
Dna Sequencing ◽  
Aqueous Solutions ◽  
Atomic Force Microscope ◽  
Piezoelectric Crystal ◽  
Atomic Force ◽  
Structure Of Molecules ◽  
Optical Lever

The atomic force microscope (AFM) is an instrument that can be used to image many samples of interest in biology and medicine. Images of polymerized amino acids, polyalanine and polyphenylalanine demonstrate the potential of the AFM for revealing the structure of molecules. Images of the protein fibrinogen which agree with TEM images demonstrate that the AFM can provide topographical data on larger molecules. Finally, images of DNA suggest the AFM may soon provide an easier and faster technique for DNA sequencing.The AFM consists of a microfabricated SiO2 triangular shaped cantilever with a diamond tip affixed at the elbow to act as a probe. The sample is mounted on a electronically driven piezoelectric crystal. It is then placed in contact with the tip and scanned. The topography of the surface causes minute deflections in the 100 μm long cantilever which are detected using an optical lever.

scholarly journals New Method of Measuring Electric Dipole Moments in Storage Rings

2004 ◽  
Vol 93 (5) ◽  
Author(s):  
F. J. M. Farley ◽  
K. Jungmann ◽  
J. P. Miller ◽  
W. M. Morse ◽  
Y. F. Orlov ◽  
...  
Keyword(s):  
Electric Dipole ◽  
Dipole Moments ◽  
Storage Rings ◽  
New Method ◽  
Electric Dipole Moments

A New Method for the Detection of Amino-Acids, Peptides, Proteins and Other Buffering Substances on Paper

Nature ◽  
1951 ◽  
Vol 168 (4266) ◽  
pp. 202-203 ◽  
Author(s):  
J. PORATH ◽  
P. FLODIN
Keyword(s):  
Amino Acids ◽  
New Method

A new method for the determination of the dielectric constant in photoconductors

1966 ◽  
Vol 46 (2) ◽  
pp. 210-216 ◽  
Author(s):  
A. Carrelli ◽  
F. Fittipaldi ◽  
L. Pauciulo
Keyword(s):  
Dielectric Constant ◽  
New Method

scholarly journals The viscosity of strong electrolytes measured by a differential method

1934 ◽  
Vol 145 (855) ◽  
pp. 475-488 ◽  
Keyword(s):  
Dielectric Constant ◽  
Empirical Equation ◽  
Relative Viscosity ◽  
Absolute Temperature ◽  
Differential Method ◽  
Theoretical Equation ◽  
Electronic Charge ◽  
Accurate Data ◽  
Avogadro’S Number ◽  
Strong Electrolytes

Until quite recently no satisfactory equation had been obtained for the representation of the viscosity of dilute solutions of strong electrolytes. An empirical equation was recently proposed by Jones and Dole to fit the only accurate data then available. Their equation may be represented thus : η = 1 + A √ c + B c , η = relative viscosity of the solution c = concentration in moles per litre A and B are constants. Jones and Dole realized that the coefficient A is due to interionic forces and in a series of later publications Falkenhagen, Dole and Vernon have deduced a theoretical equation giving values of A in terms of well-known physical constants. Their complete equation may be written η = 1 + ε √N v 1 z 1 /30η 0 √1000D k T ( z 1 + z 2 ) 4 π × [¼ μ 1 z 2 + μ 2 z 1 / μ 1 μ 2 - z 1 z 2 (μ 1 - μ 2 ) 2 /μ 1 μ 2 (√μ 1 z 1 + μ 2 z 2 + √(μ 1 + μ 2 ) ( z 1 + z 2 ) ) 2 ]√ c , where N = Avogadro's number v 1 , v 2 = numbers of ions z 1 , z 2 = valencies of ions μ 1 , μ 2 = absolute mobilities of ions D = dielectric constant of solvent k = Boltzmann's constant ε = electronic charge η 0 = viscosity of solvent T = absolute temperature.

Enthalpic Interactions of Amino Acids with Glucose in Aqueous Solutions at 298.15 K

2003 ◽  
Vol 32 (11) ◽  
pp. 977-985 ◽  
Author(s):  
Huaji Liu ◽  
Ruisen Lin ◽  
Honglin Zhang
Keyword(s):  
Amino Acids ◽  
Aqueous Solutions

Radiation-induced degradation of hydroxyl-containing amino acids in aqueous solutions

2012 ◽  
Vol 46 (4) ◽  
pp. 235-240 ◽  
Author(s):  
A. A. Sladkova ◽  
A. A. Sosnovskaya ◽  
I. P. Edimecheva ◽  
V. A. Knizhnikov ◽  
O. I. Shadyro
Keyword(s):  
Amino Acids ◽  
Aqueous Solutions ◽  
Radiation Induced
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