The effect of phase differences on the time-dependent variation of the zeta potential of hydroxyapatite

1992 ◽  
Vol 26 (2) ◽  
pp. 147-168 ◽  
Author(s):  
P. Ducheyne ◽  
C. S. Kim ◽  
S. R. Pollack
Keyword(s):  
Zeta Potential ◽  
Time Dependent ◽  
Phase Differences

scholarly journals Effect of mixing water types on the time-dependent zeta potential of Portland cement paste

2013 ◽  
Vol 20 (3) ◽  
pp. 285-292 ◽  
Author(s):  
Bahri Ersoy ◽  
Sedef Dikmen ◽  
Tayfun Uygunoğlu ◽  
Mehmet Galip İçduygu ◽  
Taner Kavas ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Portland Cement ◽  
Cement Paste ◽  
Cement Industry ◽  
Time Dependent ◽  
Mineral Admixtures ◽  
Water Type ◽  
Water Types ◽  
Portland Cement Paste ◽  
Mixing Water

AbstractThe measurement of zeta potential (ZP) has important applications in a wide range of industries including ceramics, pharmaceuticals, medicine, mineral processing, electronics, cement industry and water treatment. It provides new information on cement hydration, gel structure formation and the effects of chemical and mineral admixtures. In this study, ZP and pH measurements of Portland cement suspension prepared at wt% 1 cement/water ratio in the presence of four different types of waters, i.e., pure water, tap water, and salted (NaCl and CaCl2) water, were carried out depending on the time. Also, vicat tests of Portland cement pastes prepared at a water-to-cement ratio of 0.34 were performed. After the vicat tests, X-ray diffraction analysis and scanning electron microscopy investigations were performed on the samples. The most important result obtained from this study is that setting time and time-dependent ZP values of Portland cement paste have different values depending on the used mixing water type. Among the water types, water with CaCl2 gives the lowest ZP as absolute value, so this leads to minimum initial and final setting times for the cement paste prepared with this type of water.

Time-dependent equations for phase differences and a collective mode in Josephson-coupled layered superconductors

1994 ◽  
Vol 50 (17) ◽  
pp. 12831-12834 ◽  
Author(s):  
L. N. Bulaevskii ◽  
M. Zamora ◽  
D. Baeriswyl ◽  
H. Beck ◽  
John R. Clem
Keyword(s):  
Collective Mode ◽  
Time Dependent ◽  
Layered Superconductors ◽  
Phase Differences

Investigating the time-dependent zeta potential of wood surfaces

2018 ◽  
Vol 518 ◽  
pp. 165-173 ◽  
Author(s):  
Livius F. Muff ◽  
Thomas Luxbacher ◽  
Ingo Burgert ◽  
Benjamin Michen
Keyword(s):  
Zeta Potential ◽  
Time Dependent ◽  
Wood Surfaces

scholarly journals Filler and Water Reducer Effects on Sedimentation, Bleeding and Zeta-Potential of Cement Paste

2018 ◽  
Vol 58 (1) ◽  
pp. 107-125 ◽  
Author(s):  
Ya Peng ◽  
Bård Pedersen ◽  
Serina Ng ◽  
Klaartje de Weerdt ◽  
Stefan Jacobsen
Keyword(s):  
Hydrostatic Pressure ◽  
Zeta Potential ◽  
Cement Paste ◽  
Time Dependent ◽  
Sedimentation Rates ◽  
Combined Effects ◽  
Zeta Potentials ◽  
The Stability ◽  
Pressure Changes ◽  
Improve Stability

Abstract Bleeding and sedimentation quantify the stability of fresh cement paste, whereas the addition of fillers and water reducers affect the stability. The effect of various types of fillers and water reducers was investigated by measuring bleeding, hydrostatic pressure and electroacoustic zeta-potential. Depending on their characteristics and use, fillers can improve stability by reducing sedimentation rate and bleeding. The combined effects of fillers and water reducers on the sedimentation rates, quantified as time-dependent hydrostatic pressure changes (dp/dt) in fresh matrix, correspond to their effects on zeta-potentials. The influence of the water reducers on sedimentation and bleeding exceed that of filler type.

Analytical Solution of the Hyperbolic Heat Conduction Equation for a Moving Finite Medium Under the Effect of Time Dependent Laser Heat Source

2012 ◽  
Vol 134 (12) ◽  
Author(s):  
R. T. Al-khairy
Keyword(s):  
Heat Conduction ◽  
Analytical Solution ◽  
Heat Source ◽  
Heat Conduction Equation ◽  
Time Dependent ◽  
Hyperbolic Heat Conduction ◽  
Laser Heat Source ◽  
Reference Curves ◽  
Finite Medium ◽  
Phase Differences

This paper presents an analytical solution of the hyperbolic heat conduction equation for a moving finite medium under the effect of a time-dependent laser heat source. Laser heating is modeled as an internal heat source, whose capacity is given by g(x,t) = I(t) (1 – R)μe−μx while the finite body has an insulated boundary. The solution is obtained by the Laplace transforms method, and the discussion of solutions for two time characteristics of heat source capacities (instantaneous and exponential) is presented. The effect of the dimensionless medium velocity on the temperature profiles is examined in detail. It is found that there exists clear phase shifts in connection with the dimensionless velocity U in the spatial temperature distributions: the temperature curves with negative U values lag behind the reference curves with zero U, while the ones with positive U values precedes the reference curves. It is also found that the phase differences are the sole products of U, with increasing U predicting larger phase differences.

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