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point of zero charge

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Journal Article

A COMPARISON OF POINT OF ZERO CHARGE MEASUREMENT METHODOLOGY Available to Purchase

Elena Cristiano, Yung-Jin Hu, Matthew Siegfried, Daniel Kaplan, Heino Nitsche
Published: 01 April 2011
Clays and Clay Minerals (2011) 59 (2): 107–115.
DOI: https://doi.org/10.1346/CCMN.2011.0590201
.... Goethite (α-FeOOH) and pyrolusite (β-MnO 2 ) are ubiquitous mineral phases that are especially contaminant reactive. The objective of the present study was to measure and compare the point of zero charge (PZC) using different methods. The pyrolusite PZC was measured with three methods: mass titration (MT...
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View PDF for article title, A COMPARISON OF <span class="search-highlight">POINT</span> OF <span class="search-highlight">ZERO</span> <span class="search-highlight">CHARGE</span> MEASUREMENT METHODOLOGY
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Journal Article

Filtration-rate technique for determining zero point of charge of iron oxides Available to Purchase

Agyeman Boadi Ankomah
Published: 01 February 1991
Clays and Clay Minerals (1991) 39 (1): 100–102.
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Journal Article

The point of zero charge of natural and synthetic ferrihydrites and its relation to adsorbed silicate Free

U. Schwertmann, H. Fechter
Journal: Clay Minerals
Published: 01 August 1982
Clay Minerals (1982) 17 (4): 471–476.
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Figure 2. Surface charge on mesoporous alumina vs. surface charge on alumina particles for corresponding (pH – PZC [points of zero charge]) values and ionic strengths. If surface-charge difference between two materials were controlled only by surface-area difference, all data points would fall on 1:1 straight line. Deviation from straight line is due to effect of nanopore confinement. D.I. is deionized.

Figure 2. Surface charge on mesoporous alumina vs. surface charge on alumin... Available to Purchase

Published: 01 May 2003
Figure 2. Surface charge on mesoporous alumina vs. surface charge on alumina particles for corresponding (pH – PZC [points of zero charge]) values and ionic strengths. If surface-charge difference between two materials were controlled only by surface-area difference, all data points would fall on 1
Journal Article

Surface charge properties of kaolinite Available to Purchase

Brian K. Scroth, Garrison Sposito
Published: 01 February 1997
Clays and Clay Minerals (1997) 45 (1): 85–91.
... in surface charge properties with time were measured after mixing times of 1, 3 and 15 h, the latter representing "equilibrium". Time-dependent behavior is believed to be caused by mineral dissolution followed by readsorption or precipitation of Al on the mineral surface. Both the point of zero net charge...
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Journal Article

Mineralogical characteristics and related surface charge fluctuations of some selected soils of temperate regions of northern Iran Available to Purchase

S. Mahboob Sharami, A. Forghani, A. Akbarzadeh, H. Ramezanpour
Journal: Clay Minerals
Published: 01 September 2010
Clay Minerals (2010) 45 (3): 327–348.
DOI: https://doi.org/10.1180/claymin.2010.045.3.327
... were udic and thermic, respectively. Six representative pedons developed on granite, andesite, basalt, phyllite and limestone as their parent rocks are described and their physicochemical, mineralogical and electrical properties studied. The results indicate that the point of zero charge (PZC) values...
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View PDF for article title, Mineralogical characteristics and related surface <span class="search-highlight">charge</span> fluctuations of some selected soils of temperate regions of northern Iran
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General trends in solubility of variously charged ionic species as (a) cations, (b) hydroxide, oxide and halide complexes, and (c) anions and oxyanions as a function of pH under ambient conditions (adapted from Thornber 1992). Note indiscriminate adsorption capacity of iron oxides near their PZC (point of zero charge) of pH 8 where ionic species are also least soluble (modified after Lawrance 1999).

General trends in solubility of variously charged ionic species as ( a ) ca... Available to Purchase

Published: 01 November 2001
near their PZC (point of zero charge) of pH 8 where ionic species are also least soluble (modified after Lawrance 1999).
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(a) Zeta potential of the native sediments as a function of pH; (b) point of zero net proton charge of sediments. The size-fractionated sediments (&lt;2.0 μm) were dialyzed until the conductivity of medium decreased to ≤3 μS.

(a) Zeta potential of the native sediments as a function of pH; (b) point o... Available to Purchase

Published: 01 August 2008
Figure 8. (a) Zeta potential of the native sediments as a function of pH; (b) point of zero net proton charge of sediments. The size-fractionated sediments (<2.0 μm) were dialyzed until the conductivity of medium decreased to ≤3 μS.
Journal Article

Structure and elasticity of wadsleyite at high pressures Available to Purchase

B. Kiefer, L. Stixrude, J. Hafner, G. Kresse
Published: 01 November 2001
American Mineralogist (2001) 86 (11-12): 1387–1395.
DOI: https://doi.org/10.2138/am-2001-11-1207
...B. Kiefer; L. Stixrude; J. Hafner; G. Kresse Abstract The athermal equilibrium structure, the equation of state, the elastic constants, and O atom charges were calculated for Mg 2 SiO 4 wadsleyite over a range of pressures using a plane-wave pseudopotential method. The zero-pressure volume is 2...
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The importance of ligand and surface charges on dissolution rates. In the pH region below the point of zero net proton charge (PZNPC) the average charge on the feldspar surface is positive. In this range of pH, the adsorption of anionic organic ligands (oxalate is given as an example), which is the first step in the OXPRM, is favored. Above the PZNPC, the anionic surface will electrostatically inhibit ligand adsorption, and therefore LPRM as well. The pHPZNPC is given as a range of values (stippled) in this diagram. [Used by permission of the Geochemical Society, from Ullman and Welch (2002), Geochemical Society Special Publication. No. 7. Fig. 2, p. 12.]

The importance of ligand and surface charges on dissolution rates. In the p... Available to Purchase

Published: 01 January 2009
Figure 52. The importance of ligand and surface charges on dissolution rates. In the pH region below the point of zero net proton charge (PZNPC) the average charge on the feldspar surface is positive. In this range of pH, the adsorption of anionic organic ligands (oxalate is given as an example
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Textural parameters, pH pzc , and surface site densities of samples d ... Available to Purchase

Published: 01 January 2024
Table 2. Textural parameters, pH pzc , and surface site densities of samples d avg  = average pore width; pH PZC  = point of zero net proton charge; H s  = total surface proton concentration; D s  = surface site density. The values were calculated by Eqn 12 using S BET and H s .
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Changes to Fh (a) ζ potential (ZP), (b) isomer shift of sextet A, and (c) isomer shift of sextet B as a function of synthesis pH (both y-axes for δ span a range of 0.025 mm/s). Dashed line indicates point of zero charge (pH = 8.3). (Color online.)

Changes to Fh ( a ) ζ potential (ZP), ( b ) isomer shift of sextet A, and (... Available to Purchase

Published: 01 August 2022
Figure 6. Changes to Fh ( a ) ζ potential (ZP), ( b ) isomer shift of sextet A, and ( c ) isomer shift of sextet B as a function of synthesis pH (both y-axes for δ span a range of 0.025 mm/s). Dashed line indicates point of zero charge (pH = 8.3). (Color online.)
Journal Article

Mechanisms of Natural Fracturing in a Sedimentary Basin Available to Purchase

Kinji Magara
Journal: AAPG Bulletin
Published: 01 January 1981
AAPG Bulletin (1981) 65 (1): 123–132.
DOI: https://doi.org/10.1306/2F919783-16CE-11D7-8645000102C1865D
.... On the basis of models of vertical fluid charging through an aquifer and a fault system during continuous burial, the depth at which the charged fluid pressure gradient exceeds the fracture gradient (or the point of natural hydrofracturing) is estimated. After an erosional event, the most significant decline...
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Journal Article

THE SURFACE CHEMISTRY OF IMOGOLITE Available to Purchase

Jon Petter Gustafsson
Published: 01 February 2001
Clays and Clay Minerals (2001) 49 (1): 73–80.
...Jon Petter Gustafsson Abstract Imogolite is a tubular aluminosilicate which is common in Andosols and Spodosols. The high pH at point-of-zero charge at the outer parts of the tube and the anomalously high chloride adsorption of imogolite suggested that there may be structural charge associated...
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View PDF for article title, THE SURFACE CHEMISTRY OF IMOGOLITE
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Journal Article

Cation exchange capacity of kaolinite Available to Purchase

Chi Ma, Richard A. Eggleton
Published: 01 April 1999
Clays and Clay Minerals (1999) 47 (2): 174–180.
... to a higher CEC value. This study indicates that charge from broken edges and exposed OH planes rather than charge from Al/Si substitution determines the kaolinite CEC, even at zero point charge. A high CEC in some kaolinites is found to be due to smectite layers on the surface of the kaolinite crystals...
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Journal Article

PREDICTION OF CRYSTAL MORPHOLOGY OF COMPLEX URANYL-SHEET MINERALS. I. THEORY Available to Purchase

Michael Schindler, Andreas Mutter, Frank C. Hawthorne, Andrew Putnis
Published: 01 December 2004
The Canadian Mineralogist (2004) 42 (6): 1629–1649.
DOI: https://doi.org/10.2113/gscanmin.42.6.1629
... of polyhedra. Growth and dissolution at an edge are promoted by interaction between activated sites and aqueous solution. The interaction has its minimum at the point of zero-charge (pH pzc ) of the edge and at saturation with respect to the mineral, and increases with the difference between pH and pH pzc...
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View PDF for article title, PREDICTION OF CRYSTAL MORPHOLOGY OF COMPLEX URANYL-SHEET MINERALS. I. THEORY
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Cole-Cole model parameters as a function of pH for a 5% Fe0 by volume Fe0-sand sample saturated with 0.01 M NaNO 3 solution and doped with 1 M HNO 3 or 1 M NaOH. PZC denotes possible point of zero charge (see text for explanation).

Cole-Cole model parameters as a function of pH for a 5% Fe 0 b... Available to Purchase

Published: 07 July 2005
Figure 6. Cole-Cole model parameters as a function of pH for a 5% Fe 0 by volume Fe 0 -sand sample saturated with 0.01 M NaNO   3 solution and doped with 1 M HNO   3 or 1 M NaOH. PZC denotes possible point of zero charge (see text for explanation).
Journal Article

Interfacial structure and acidity of the orthoclase (001) surface: Understanding the effect of the surface metal cation Available to Purchase

Xi Zhang, Xiandong Liu, Yingchun Zhang, Xiancai Lu
Published: 01 March 2025
American Mineralogist (2025) 110 (3): 446–451.
DOI: https://doi.org/10.2138/am-2023-9207
.... Based on the p K as, we derive a PZC (point of zero charge) of 9.7 and 4.9 for orthoclase (001) with surface K + and Na + , respectively. This means that Na + significantly enhances surface acid reactivity. The implication for understanding the geochemical properties of orthoclase is discussed...
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View PDF for article title, Interfacial structure and acidity of the orthoclase (001) surface: Understanding the effect of the surface metal cation
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Journal Article

Methods for performing atomic force microscopy imaging of clay minerals in aqueous solutions Available to Purchase

Barry R. Bickmore, Michael F. Hochella, Dirk Bosbach, Laurent Charlet
Published: 01 October 1999
Clays and Clay Minerals (1999) 47 (5): 573–581.
... the imaging process, but hold the particles sufficiently so that they do not move laterally or float away during imaging. Two techniques depend on electrostatic attraction under circumneutral pH conditions, between the negatively charged clay particles and the high point of zero charge substrate (either...
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Correlation of pH-dependent surface interaction forces to amino acid adsorption: Implications for the origin of life Available to Purchase

Hugh Churchill, Henry Teng, Robert M. Hazen
Published: 01 July 2004
American Mineralogist (2004) 89 (7): 1048–1055.
DOI: https://doi.org/10.2138/am-2004-0716
... or attraction appeared near the point of zero charge (pH pzc ) values for quartz (≈2.8), calcite (9.5), albite (2.6), and silica glass (3.5). We observed small, but significant, differences in pH pzc values for the (100), (101), and (011) faces of quartz. In order to correlate mineral surface charges with ionic...
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View PDF for article title, Correlation of pH-dependent surface interaction forces to amino acid adsorption: Implications for the origin of life
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