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fluorohectorite

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Journal Article
Journal: Clay Minerals
Published: 01 September 2012
Clay Minerals (2012) 47 (3): 341–353.
... and therefore 'shear-labile' synthetic Mg-fluorohectorite in aqueous dispersion. The attainable degree of exfoliation can be tuned and controlled through the shear forces applied by changing process parameters such as solid content and grinding media diameter. Characterization and evaluation of the exfoliation...
FIGURES
First thumbnail for: A simple approach for producing high aspect ratio ...
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Third thumbnail for: A simple approach for producing high aspect ratio ...
Journal Article
Journal: Clay Minerals
Published: 01 December 1994
Clay Minerals (1994) 29 (5): 743–749.
Journal Article
Published: 01 October 2020
Clays and Clay Minerals (2020) 68 (5): 428–435.
... and absorption in the visible light spectrum improves significantly the hiding power as well as the color strength of pearlescent pigments while potentially extending their color range. The aim of the present study was to introduce synthetic fluorohectorites, having an appreciable diameter (~20 μm) and aspect...
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First thumbnail for: Absorption Pigment Cores for Pearlescent Pigments
Second thumbnail for: Absorption Pigment Cores for Pearlescent Pigments
Third thumbnail for: Absorption Pigment Cores for Pearlescent Pigments
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(a) Tuning of the hydration state in fluorohectorite where M, MH, and ML indicate interlayer cations with |Ehyd|: ML < M < MH. (b) Illustration of the shearing effect on the fluorohectorite platelets in the milling chamber.
Published: 01 September 2012
Fig. 3. (a) Tuning of the hydration state in fluorohectorite where M, M H , and M L indicate interlayer cations with | E hyd |: M L < M < M H . (b) Illustration of the shearing effect on the fluorohectorite platelets in the milling chamber.
Journal Article
Published: 01 August 2013
American Mineralogist (2013) 98 (8-9): 1535–1542.
... is that the center of the TMA molecule in montmorillonite is 0.87 Å from the center of the interlayer as compared to 1.22 Å in vermiculite. Thus, the TMA cation is located closer to the tetrahedral-ring cavity in vermiculite, and this is a result of the greater tetrahedral charge of vermiculite. In fluorohectorite...
FIGURES
First thumbnail for: Interlayer water molecules in organocation-exchang...
Second thumbnail for: Interlayer water molecules in organocation-exchang...
Third thumbnail for: Interlayer water molecules in organocation-exchang...
Journal Article
Journal: Clay Minerals
Published: 01 December 2003
Clay Minerals (2003) 38 (4): 561–572.
...J. BUJDÁK; N. IYI; Y. KANEKO; R. SASAI Abstract Cationic dye, methylene blue (MB), was intercalated into films of expandable clay minerals with low, moderate and high layer charges (saponite, montmorillonite and synthetic expandable mica-fluorohectorite, respectively) . Tilted orientation...
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First thumbnail for: Molecular orientation of methylene blue cations ad...
Second thumbnail for: Molecular orientation of methylene blue cations ad...
Third thumbnail for: Molecular orientation of methylene blue cations ad...
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HRTEM lattice-fringe images of synthetic fluorohectorite samples with layer charges of 0.4 and 0.6 eq/O10(OH)2. The ultrathin sections of the of 0.4 eq/O10(OH)2 fluorohectorite treated according to method 2 reveal several different expanded structures: (a) large crystals with highly expanded 2:1 silicate layers with 24–25 Å spacings (white diamond). Some layers show expansions of 13–14 Å.(b) Crystals that only have layers with an expansion of 13–14 Å (white half circle). (c–d) Highly expanded silicate layers (21–27 Å) and 13–14 Å layers commonly occur within the same crystal. In many cases, the alternation of these layers generate short sequences resembling rectorite-like structures (white stars in d). The expansion behavior can also change laterally within the same silicate layer indicating a change in layer charge (white arrows in a, c, and d). (e–f) Lattice-fringe images of 0.6 eq/O10(OH)2 fluorohectorite show crystals with highly expanded silicate layers of between 23 and 26 Å. Some of these highly expanded sequences can contain 13–14 Å layers.
Published: 01 August 2014
Figure 5 HRTEM lattice-fringe images of synthetic fluorohectorite samples with layer charges of 0.4 and 0.6 eq/O 10 (OH) 2 . The ultrathin sections of the of 0.4 eq/O 10 (OH) 2 fluorohectorite treated according to method 2 reveal several different expanded structures: (a) large crystals
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a Schematic structure of fluorophlogopite, b SEM images of fluorophlogopite, c montmorillonite, and d fluorohectorite platelets
Published: 01 October 2020
Fig. 1. a Schematic structure of fluorophlogopite, b SEM images of fluorophlogopite, c montmorillonite, and d fluorohectorite platelets
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XRD patterns of different stages of hydration of synthetic fluorohectorite (moist samples).
Published: 01 September 2012
Fig. 1. XRD patterns of different stages of hydration of synthetic fluorohectorite (moist samples).
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TEM image of Laponite® (fluorohectorite-like) produced using a ‘shadowing’ technique for BYK R&amp;D during the 1990s.
Published: 01 September 2020
Fig. 2. TEM image of Laponite® (fluorohectorite-like) produced using a ‘shadowing’ technique for BYK R&D during the 1990s.
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Representative SEM images of K-fluorohectorite before and after milling for 90 min (30 wt.%).
Published: 01 September 2012
Fig. 7. Representative SEM images of K-fluorohectorite before and after milling for 90 min (30 wt.%).
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Influence of the solid content of three different Mg-fluorohectorite dispersions [(▪) 5, (•) 15, (▴) 30 wt.%] on the FWHM values under the same milling conditions.
Published: 01 September 2012
Fig. 4. Influence of the solid content of three different Mg-fluorohectorite dispersions [(▪) 5, (•) 15, (▴) 30 wt.%] on the FWHM values under the same milling conditions.
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Evolution of estimated aspect ratios (α) values with milling time for dispersions of different clay contents (for the original Na-fluorohectorite: α ∼50).
Published: 01 September 2012
Fig. 8. Evolution of estimated aspect ratios (α) values with milling time for dispersions of different clay contents (for the original Na-fluorohectorite: α ∼50).
Image
CEC values (a) of external surfaces and the corresponding BET values, (b) for three sets of K-fluorohectorite with different solid content [(▪), 5 (•), 15 (▴) 30 wt.%].
Published: 01 September 2012
Fig. 6. CEC values (a) of external surfaces and the corresponding BET values, (b) for three sets of K-fluorohectorite with different solid content [(▪), 5 (•), 15 (▴) 30 wt.%].
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Median particle sizes (X50 and X90) obtained from SLS for three different Mg-fluorohectorite dispersions [(▪) 5, (•) 15, (▴) 30 wt.%] under the same milling conditions.
Published: 01 September 2012
Fig. 5. Median particle sizes ( X 50 and X 90 ) obtained from SLS for three different Mg-fluorohectorite dispersions [(▪) 5, (•) 15, (▴) 30 wt.%] under the same milling conditions.
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CEC values (a) of external surfaces and the corresponding BET values, (b) for two sets of K-fluorohectorite produced by milling with two different grinding media [(▴) 1.4–1.6 mm, and (♦) 0.6–0.8 mm].
Published: 01 September 2012
Fig. 11. CEC values (a) of external surfaces and the corresponding BET values, (b) for two sets of K-fluorohectorite produced by milling with two different grinding media [(▴) 1.4–1.6 mm, and (♦) 0.6–0.8 mm].
Journal Article
Published: 01 August 2014
Clays and Clay Minerals (2014) 62 (4): 336–353.
...Figure 5 HRTEM lattice-fringe images of synthetic fluorohectorite samples with layer charges of 0.4 and 0.6 eq/O 10 (OH) 2 . The ultrathin sections of the of 0.4 eq/O 10 (OH) 2 fluorohectorite treated according to method 2 reveal several different expanded structures: (a) large crystals...
FIGURES
First thumbnail for: EXPANSION BEHAVIOR OF OCTADECYLAMMONIUM-EXCHANGED ...
Second thumbnail for: EXPANSION BEHAVIOR OF OCTADECYLAMMONIUM-EXCHANGED ...
Third thumbnail for: EXPANSION BEHAVIOR OF OCTADECYLAMMONIUM-EXCHANGED ...
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Influence of two different grinding media sizes, GM1 and GM2 [(▴) 1.4–1.6 mm, and (♦) 0.6–0.8 mm] on the evolution of FWHM values with milling time for a 30 wt.% dispersion of Mg-fluorohectorite.
Published: 01 September 2012
Fig. 9. Influence of two different grinding media sizes, GM 1 and GM 2 [(▴) 1.4–1.6 mm, and (♦) 0.6–0.8 mm] on the evolution of FWHM values with milling time for a 30 wt.% dispersion of Mg-fluorohectorite.
Journal Article
Journal: Clay Minerals
Published: 01 June 2008
Clay Minerals (2008) 43 (2): 205–212.
...-charge clays retain water more efficiently, forming aggregates without extensive drying. The hydroxylated hectorite exhibits two 1 H NMR signals near 0 ppm whereas the fluorohectorites are characterized by a single peak in the same region. The 23 Na 2D 3Q magic angle spinning (MAS) spectra of the low...
FIGURES
First thumbnail for: XRD and NMR characterization of synthetic hectorit...
Second thumbnail for: XRD and NMR characterization of synthetic hectorit...
Third thumbnail for: XRD and NMR characterization of synthetic hectorit...
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Cumulative volume weighted particle size distribution (Q3) curves obtained by SLS showing the effect of two different grinding media (GM1 and GM2) on a 30 wt.% dispersion of Mg-fluorohectorite in respect to the milling time: [(▪) initial, (•) 10, (▴) 50, (♦) 90, (▾) 130 min].
Published: 01 September 2012
Fig. 10. Cumulative volume weighted particle size distribution (Q 3 ) curves obtained by SLS showing the effect of two different grinding media (GM 1 and GM 2 ) on a 30 wt.% dispersion of Mg-fluorohectorite in respect to the milling time: [(▪) initial, (•) 10, (▴) 50, (♦) 90, (▾) 130 min].