ABSORPTION PIGMENT CORES FOR PEARLESCENT PIGMENTS
Abstract A lustrous appearance and interference-based colors make pearlescent pigments attractive for use in applications such as automotive paints, plastics, consumer electronics, and cosmetics. A combination of interference and absorption in the visible light spectrum improves significantly the hi...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Matejdes, Marián [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2020 |
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| Schlagwörter: |
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| Anmerkung: |
© The Clay Minerals Society 2020 |
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| Übergeordnetes Werk: |
Enthalten in: Clays and clay minerals - Springer International Publishing, 1954, 68(2020), 5 vom: Okt., Seite 428-435 |
|---|---|
| Übergeordnetes Werk: |
volume:68 ; year:2020 ; number:5 ; month:10 ; pages:428-435 |
| Links: |
|---|
| DOI / URN: |
10.1007/s42860-020-00085-7 |
|---|
| Katalog-ID: |
OLC2121614044 |
|---|
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| 520 | |a Abstract A lustrous appearance and interference-based colors make pearlescent pigments attractive for use in applications such as automotive paints, plastics, consumer electronics, and cosmetics. A combination of interference 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 ratio (~1000), as promising colored cores for pearlescent pigments. Fluorohectorites can adopt a variety of colors by ion-exchange reaction with cationic organic dyes of high absorption coefficient. Unlike related dye-exchanged natural montmorillonite clays, which undergo acid activation accompanied by release of dye at low pH, as is required for subsequent coating with $ TiO_{2} $ in an environment with low pH and elevated temperature, no leaching was observed with dye-exchanged synthetic fluorohectorites ([$ Na_{0.5} $]int.[$ Mg_{2.5} $$ Li_{0.5} $]oct.[$ Si_{4} $]tet.$ O_{10} $$ F_{2} $). Due to its significantly greater layer charge, more organic dye molecules were adsorbed per volume of the fluorohectorite than for montmorillonite. Consequently, the free volume available in the interlayer space for $ H_{3} $$ O^{+} $ diffusion was less for synthetic fluorohectorite than for montmorillonite. Acid attack via interlayer space was, therefore, retarded significantly for fluorohectorite. Acid attack from the external edges of synthetic fluorohectorites was in the range of conventionally applied mica pigment core (fluorophlogopite, ([K]int.[$ Mg_{3} $]oct.[$ AlSi_{3} $]tet.$ O_{10} $(F,OH)2) because of the comparable large diameter of the platelets. Montmorillonite, however, occurs with particle diameters typically <200 nm and the much increased relative contribution of edges to the total surface area also makes them more prone to acid attack and concomitant leaching. Aside from leaching stability, the confinement of organic dyes in the interlayer space restricts rotational and vibrational motions, which in turn stabilizes the dyes typically by ~100°C against thermal decomposition as compared to chloride salts of the dyes. | ||
| 650 | 4 | |a Absorption cores | |
| 650 | 4 | |a Acid stability | |
| 650 | 4 | |a Natural montmorillonite | |
| 650 | 4 | |a Pearlescent pigments | |
| 650 | 4 | |a Synthetic fluorohectorite | |
| 650 | 4 | |a Thermal stability | |
| 700 | 1 | |a Hausner, Josef |4 aut | |
| 700 | 1 | |a Grüner, Michael |4 aut | |
| 700 | 1 | |a Kaupp, Günter |4 aut | |
| 700 | 1 | |a Breu, Josef |4 aut | |
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10.1007/s42860-020-00085-7 doi (DE-627)OLC2121614044 (DE-He213)s42860-020-00085-7-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn Matejdes, Marián verfasserin (orcid)0000-0002-3723-1844 aut ABSORPTION PIGMENT CORES FOR PEARLESCENT PIGMENTS 2020 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Clay Minerals Society 2020 Abstract A lustrous appearance and interference-based colors make pearlescent pigments attractive for use in applications such as automotive paints, plastics, consumer electronics, and cosmetics. A combination of interference 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 ratio (~1000), as promising colored cores for pearlescent pigments. Fluorohectorites can adopt a variety of colors by ion-exchange reaction with cationic organic dyes of high absorption coefficient. Unlike related dye-exchanged natural montmorillonite clays, which undergo acid activation accompanied by release of dye at low pH, as is required for subsequent coating with $ TiO_{2} $ in an environment with low pH and elevated temperature, no leaching was observed with dye-exchanged synthetic fluorohectorites ([$ Na_{0.5} $]int.[$ Mg_{2.5} $$ Li_{0.5} $]oct.[$ Si_{4} $]tet.$ O_{10} $$ F_{2} $). Due to its significantly greater layer charge, more organic dye molecules were adsorbed per volume of the fluorohectorite than for montmorillonite. Consequently, the free volume available in the interlayer space for $ H_{3} $$ O^{+} $ diffusion was less for synthetic fluorohectorite than for montmorillonite. Acid attack via interlayer space was, therefore, retarded significantly for fluorohectorite. Acid attack from the external edges of synthetic fluorohectorites was in the range of conventionally applied mica pigment core (fluorophlogopite, ([K]int.[$ Mg_{3} $]oct.[$ AlSi_{3} $]tet.$ O_{10} $(F,OH)2) because of the comparable large diameter of the platelets. Montmorillonite, however, occurs with particle diameters typically <200 nm and the much increased relative contribution of edges to the total surface area also makes them more prone to acid attack and concomitant leaching. Aside from leaching stability, the confinement of organic dyes in the interlayer space restricts rotational and vibrational motions, which in turn stabilizes the dyes typically by ~100°C against thermal decomposition as compared to chloride salts of the dyes. Absorption cores Acid stability Natural montmorillonite Pearlescent pigments Synthetic fluorohectorite Thermal stability Hausner, Josef aut Grüner, Michael aut Kaupp, Günter aut Breu, Josef aut Enthalten in Clays and clay minerals Springer International Publishing, 1954 68(2020), 5 vom: Okt., Seite 428-435 (DE-627)129559369 (DE-600)221428-3 (DE-576)015019284 0009-8604 nnns volume:68 year:2020 number:5 month:10 pages:428-435 https://doi.org/10.1007/s42860-020-00085-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_69 AR 68 2020 5 10 428-435 |
| spelling |
10.1007/s42860-020-00085-7 doi (DE-627)OLC2121614044 (DE-He213)s42860-020-00085-7-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn Matejdes, Marián verfasserin (orcid)0000-0002-3723-1844 aut ABSORPTION PIGMENT CORES FOR PEARLESCENT PIGMENTS 2020 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Clay Minerals Society 2020 Abstract A lustrous appearance and interference-based colors make pearlescent pigments attractive for use in applications such as automotive paints, plastics, consumer electronics, and cosmetics. A combination of interference 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 ratio (~1000), as promising colored cores for pearlescent pigments. Fluorohectorites can adopt a variety of colors by ion-exchange reaction with cationic organic dyes of high absorption coefficient. Unlike related dye-exchanged natural montmorillonite clays, which undergo acid activation accompanied by release of dye at low pH, as is required for subsequent coating with $ TiO_{2} $ in an environment with low pH and elevated temperature, no leaching was observed with dye-exchanged synthetic fluorohectorites ([$ Na_{0.5} $]int.[$ Mg_{2.5} $$ Li_{0.5} $]oct.[$ Si_{4} $]tet.$ O_{10} $$ F_{2} $). Due to its significantly greater layer charge, more organic dye molecules were adsorbed per volume of the fluorohectorite than for montmorillonite. Consequently, the free volume available in the interlayer space for $ H_{3} $$ O^{+} $ diffusion was less for synthetic fluorohectorite than for montmorillonite. Acid attack via interlayer space was, therefore, retarded significantly for fluorohectorite. Acid attack from the external edges of synthetic fluorohectorites was in the range of conventionally applied mica pigment core (fluorophlogopite, ([K]int.[$ Mg_{3} $]oct.[$ AlSi_{3} $]tet.$ O_{10} $(F,OH)2) because of the comparable large diameter of the platelets. Montmorillonite, however, occurs with particle diameters typically <200 nm and the much increased relative contribution of edges to the total surface area also makes them more prone to acid attack and concomitant leaching. Aside from leaching stability, the confinement of organic dyes in the interlayer space restricts rotational and vibrational motions, which in turn stabilizes the dyes typically by ~100°C against thermal decomposition as compared to chloride salts of the dyes. Absorption cores Acid stability Natural montmorillonite Pearlescent pigments Synthetic fluorohectorite Thermal stability Hausner, Josef aut Grüner, Michael aut Kaupp, Günter aut Breu, Josef aut Enthalten in Clays and clay minerals Springer International Publishing, 1954 68(2020), 5 vom: Okt., Seite 428-435 (DE-627)129559369 (DE-600)221428-3 (DE-576)015019284 0009-8604 nnns volume:68 year:2020 number:5 month:10 pages:428-435 https://doi.org/10.1007/s42860-020-00085-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_69 AR 68 2020 5 10 428-435 |
| allfields_unstemmed |
10.1007/s42860-020-00085-7 doi (DE-627)OLC2121614044 (DE-He213)s42860-020-00085-7-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn Matejdes, Marián verfasserin (orcid)0000-0002-3723-1844 aut ABSORPTION PIGMENT CORES FOR PEARLESCENT PIGMENTS 2020 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Clay Minerals Society 2020 Abstract A lustrous appearance and interference-based colors make pearlescent pigments attractive for use in applications such as automotive paints, plastics, consumer electronics, and cosmetics. A combination of interference 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 ratio (~1000), as promising colored cores for pearlescent pigments. Fluorohectorites can adopt a variety of colors by ion-exchange reaction with cationic organic dyes of high absorption coefficient. Unlike related dye-exchanged natural montmorillonite clays, which undergo acid activation accompanied by release of dye at low pH, as is required for subsequent coating with $ TiO_{2} $ in an environment with low pH and elevated temperature, no leaching was observed with dye-exchanged synthetic fluorohectorites ([$ Na_{0.5} $]int.[$ Mg_{2.5} $$ Li_{0.5} $]oct.[$ Si_{4} $]tet.$ O_{10} $$ F_{2} $). Due to its significantly greater layer charge, more organic dye molecules were adsorbed per volume of the fluorohectorite than for montmorillonite. Consequently, the free volume available in the interlayer space for $ H_{3} $$ O^{+} $ diffusion was less for synthetic fluorohectorite than for montmorillonite. Acid attack via interlayer space was, therefore, retarded significantly for fluorohectorite. Acid attack from the external edges of synthetic fluorohectorites was in the range of conventionally applied mica pigment core (fluorophlogopite, ([K]int.[$ Mg_{3} $]oct.[$ AlSi_{3} $]tet.$ O_{10} $(F,OH)2) because of the comparable large diameter of the platelets. Montmorillonite, however, occurs with particle diameters typically <200 nm and the much increased relative contribution of edges to the total surface area also makes them more prone to acid attack and concomitant leaching. Aside from leaching stability, the confinement of organic dyes in the interlayer space restricts rotational and vibrational motions, which in turn stabilizes the dyes typically by ~100°C against thermal decomposition as compared to chloride salts of the dyes. Absorption cores Acid stability Natural montmorillonite Pearlescent pigments Synthetic fluorohectorite Thermal stability Hausner, Josef aut Grüner, Michael aut Kaupp, Günter aut Breu, Josef aut Enthalten in Clays and clay minerals Springer International Publishing, 1954 68(2020), 5 vom: Okt., Seite 428-435 (DE-627)129559369 (DE-600)221428-3 (DE-576)015019284 0009-8604 nnns volume:68 year:2020 number:5 month:10 pages:428-435 https://doi.org/10.1007/s42860-020-00085-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_69 AR 68 2020 5 10 428-435 |
| allfieldsGer |
10.1007/s42860-020-00085-7 doi (DE-627)OLC2121614044 (DE-He213)s42860-020-00085-7-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn Matejdes, Marián verfasserin (orcid)0000-0002-3723-1844 aut ABSORPTION PIGMENT CORES FOR PEARLESCENT PIGMENTS 2020 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Clay Minerals Society 2020 Abstract A lustrous appearance and interference-based colors make pearlescent pigments attractive for use in applications such as automotive paints, plastics, consumer electronics, and cosmetics. A combination of interference 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 ratio (~1000), as promising colored cores for pearlescent pigments. Fluorohectorites can adopt a variety of colors by ion-exchange reaction with cationic organic dyes of high absorption coefficient. Unlike related dye-exchanged natural montmorillonite clays, which undergo acid activation accompanied by release of dye at low pH, as is required for subsequent coating with $ TiO_{2} $ in an environment with low pH and elevated temperature, no leaching was observed with dye-exchanged synthetic fluorohectorites ([$ Na_{0.5} $]int.[$ Mg_{2.5} $$ Li_{0.5} $]oct.[$ Si_{4} $]tet.$ O_{10} $$ F_{2} $). Due to its significantly greater layer charge, more organic dye molecules were adsorbed per volume of the fluorohectorite than for montmorillonite. Consequently, the free volume available in the interlayer space for $ H_{3} $$ O^{+} $ diffusion was less for synthetic fluorohectorite than for montmorillonite. Acid attack via interlayer space was, therefore, retarded significantly for fluorohectorite. Acid attack from the external edges of synthetic fluorohectorites was in the range of conventionally applied mica pigment core (fluorophlogopite, ([K]int.[$ Mg_{3} $]oct.[$ AlSi_{3} $]tet.$ O_{10} $(F,OH)2) because of the comparable large diameter of the platelets. Montmorillonite, however, occurs with particle diameters typically <200 nm and the much increased relative contribution of edges to the total surface area also makes them more prone to acid attack and concomitant leaching. Aside from leaching stability, the confinement of organic dyes in the interlayer space restricts rotational and vibrational motions, which in turn stabilizes the dyes typically by ~100°C against thermal decomposition as compared to chloride salts of the dyes. Absorption cores Acid stability Natural montmorillonite Pearlescent pigments Synthetic fluorohectorite Thermal stability Hausner, Josef aut Grüner, Michael aut Kaupp, Günter aut Breu, Josef aut Enthalten in Clays and clay minerals Springer International Publishing, 1954 68(2020), 5 vom: Okt., Seite 428-435 (DE-627)129559369 (DE-600)221428-3 (DE-576)015019284 0009-8604 nnns volume:68 year:2020 number:5 month:10 pages:428-435 https://doi.org/10.1007/s42860-020-00085-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_69 AR 68 2020 5 10 428-435 |
| allfieldsSound |
10.1007/s42860-020-00085-7 doi (DE-627)OLC2121614044 (DE-He213)s42860-020-00085-7-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn Matejdes, Marián verfasserin (orcid)0000-0002-3723-1844 aut ABSORPTION PIGMENT CORES FOR PEARLESCENT PIGMENTS 2020 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Clay Minerals Society 2020 Abstract A lustrous appearance and interference-based colors make pearlescent pigments attractive for use in applications such as automotive paints, plastics, consumer electronics, and cosmetics. A combination of interference 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 ratio (~1000), as promising colored cores for pearlescent pigments. Fluorohectorites can adopt a variety of colors by ion-exchange reaction with cationic organic dyes of high absorption coefficient. Unlike related dye-exchanged natural montmorillonite clays, which undergo acid activation accompanied by release of dye at low pH, as is required for subsequent coating with $ TiO_{2} $ in an environment with low pH and elevated temperature, no leaching was observed with dye-exchanged synthetic fluorohectorites ([$ Na_{0.5} $]int.[$ Mg_{2.5} $$ Li_{0.5} $]oct.[$ Si_{4} $]tet.$ O_{10} $$ F_{2} $). Due to its significantly greater layer charge, more organic dye molecules were adsorbed per volume of the fluorohectorite than for montmorillonite. Consequently, the free volume available in the interlayer space for $ H_{3} $$ O^{+} $ diffusion was less for synthetic fluorohectorite than for montmorillonite. Acid attack via interlayer space was, therefore, retarded significantly for fluorohectorite. Acid attack from the external edges of synthetic fluorohectorites was in the range of conventionally applied mica pigment core (fluorophlogopite, ([K]int.[$ Mg_{3} $]oct.[$ AlSi_{3} $]tet.$ O_{10} $(F,OH)2) because of the comparable large diameter of the platelets. Montmorillonite, however, occurs with particle diameters typically <200 nm and the much increased relative contribution of edges to the total surface area also makes them more prone to acid attack and concomitant leaching. Aside from leaching stability, the confinement of organic dyes in the interlayer space restricts rotational and vibrational motions, which in turn stabilizes the dyes typically by ~100°C against thermal decomposition as compared to chloride salts of the dyes. Absorption cores Acid stability Natural montmorillonite Pearlescent pigments Synthetic fluorohectorite Thermal stability Hausner, Josef aut Grüner, Michael aut Kaupp, Günter aut Breu, Josef aut Enthalten in Clays and clay minerals Springer International Publishing, 1954 68(2020), 5 vom: Okt., Seite 428-435 (DE-627)129559369 (DE-600)221428-3 (DE-576)015019284 0009-8604 nnns volume:68 year:2020 number:5 month:10 pages:428-435 https://doi.org/10.1007/s42860-020-00085-7 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_69 AR 68 2020 5 10 428-435 |
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Enthalten in Clays and clay minerals 68(2020), 5 vom: Okt., Seite 428-435 volume:68 year:2020 number:5 month:10 pages:428-435 |
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Enthalten in Clays and clay minerals 68(2020), 5 vom: Okt., Seite 428-435 volume:68 year:2020 number:5 month:10 pages:428-435 |
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Absorption cores Acid stability Natural montmorillonite Pearlescent pigments Synthetic fluorohectorite Thermal stability |
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Matejdes, Marián @@aut@@ Hausner, Josef @@aut@@ Grüner, Michael @@aut@@ Kaupp, Günter @@aut@@ Breu, Josef @@aut@@ |
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A combination of interference 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 ratio (~1000), as promising colored cores for pearlescent pigments. Fluorohectorites can adopt a variety of colors by ion-exchange reaction with cationic organic dyes of high absorption coefficient. Unlike related dye-exchanged natural montmorillonite clays, which undergo acid activation accompanied by release of dye at low pH, as is required for subsequent coating with $ TiO_{2} $ in an environment with low pH and elevated temperature, no leaching was observed with dye-exchanged synthetic fluorohectorites ([$ Na_{0.5} $]int.[$ Mg_{2.5} $$ Li_{0.5} $]oct.[$ Si_{4} $]tet.$ O_{10} $$ F_{2} $). Due to its significantly greater layer charge, more organic dye molecules were adsorbed per volume of the fluorohectorite than for montmorillonite. Consequently, the free volume available in the interlayer space for $ H_{3} $$ O^{+} $ diffusion was less for synthetic fluorohectorite than for montmorillonite. Acid attack via interlayer space was, therefore, retarded significantly for fluorohectorite. Acid attack from the external edges of synthetic fluorohectorites was in the range of conventionally applied mica pigment core (fluorophlogopite, ([K]int.[$ Mg_{3} $]oct.[$ AlSi_{3} $]tet.$ O_{10} $(F,OH)2) because of the comparable large diameter of the platelets. Montmorillonite, however, occurs with particle diameters typically <200 nm and the much increased relative contribution of edges to the total surface area also makes them more prone to acid attack and concomitant leaching. 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Matejdes, Marián |
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Matejdes, Marián ddc 550 ssgn 13 misc Absorption cores misc Acid stability misc Natural montmorillonite misc Pearlescent pigments misc Synthetic fluorohectorite misc Thermal stability ABSORPTION PIGMENT CORES FOR PEARLESCENT PIGMENTS |
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550 VZ 13 ssgn ABSORPTION PIGMENT CORES FOR PEARLESCENT PIGMENTS Absorption cores Acid stability Natural montmorillonite Pearlescent pigments Synthetic fluorohectorite Thermal stability |
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ddc 550 ssgn 13 misc Absorption cores misc Acid stability misc Natural montmorillonite misc Pearlescent pigments misc Synthetic fluorohectorite misc Thermal stability |
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ddc 550 ssgn 13 misc Absorption cores misc Acid stability misc Natural montmorillonite misc Pearlescent pigments misc Synthetic fluorohectorite misc Thermal stability |
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ddc 550 ssgn 13 misc Absorption cores misc Acid stability misc Natural montmorillonite misc Pearlescent pigments misc Synthetic fluorohectorite misc Thermal stability |
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ABSORPTION PIGMENT CORES FOR PEARLESCENT PIGMENTS |
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ABSORPTION PIGMENT CORES FOR PEARLESCENT PIGMENTS |
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absorption pigment cores for pearlescent pigments |
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ABSORPTION PIGMENT CORES FOR PEARLESCENT PIGMENTS |
| abstract |
Abstract A lustrous appearance and interference-based colors make pearlescent pigments attractive for use in applications such as automotive paints, plastics, consumer electronics, and cosmetics. A combination of interference 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 ratio (~1000), as promising colored cores for pearlescent pigments. Fluorohectorites can adopt a variety of colors by ion-exchange reaction with cationic organic dyes of high absorption coefficient. Unlike related dye-exchanged natural montmorillonite clays, which undergo acid activation accompanied by release of dye at low pH, as is required for subsequent coating with $ TiO_{2} $ in an environment with low pH and elevated temperature, no leaching was observed with dye-exchanged synthetic fluorohectorites ([$ Na_{0.5} $]int.[$ Mg_{2.5} $$ Li_{0.5} $]oct.[$ Si_{4} $]tet.$ O_{10} $$ F_{2} $). Due to its significantly greater layer charge, more organic dye molecules were adsorbed per volume of the fluorohectorite than for montmorillonite. Consequently, the free volume available in the interlayer space for $ H_{3} $$ O^{+} $ diffusion was less for synthetic fluorohectorite than for montmorillonite. Acid attack via interlayer space was, therefore, retarded significantly for fluorohectorite. Acid attack from the external edges of synthetic fluorohectorites was in the range of conventionally applied mica pigment core (fluorophlogopite, ([K]int.[$ Mg_{3} $]oct.[$ AlSi_{3} $]tet.$ O_{10} $(F,OH)2) because of the comparable large diameter of the platelets. Montmorillonite, however, occurs with particle diameters typically <200 nm and the much increased relative contribution of edges to the total surface area also makes them more prone to acid attack and concomitant leaching. Aside from leaching stability, the confinement of organic dyes in the interlayer space restricts rotational and vibrational motions, which in turn stabilizes the dyes typically by ~100°C against thermal decomposition as compared to chloride salts of the dyes. © The Clay Minerals Society 2020 |
| abstractGer |
Abstract A lustrous appearance and interference-based colors make pearlescent pigments attractive for use in applications such as automotive paints, plastics, consumer electronics, and cosmetics. A combination of interference 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 ratio (~1000), as promising colored cores for pearlescent pigments. Fluorohectorites can adopt a variety of colors by ion-exchange reaction with cationic organic dyes of high absorption coefficient. Unlike related dye-exchanged natural montmorillonite clays, which undergo acid activation accompanied by release of dye at low pH, as is required for subsequent coating with $ TiO_{2} $ in an environment with low pH and elevated temperature, no leaching was observed with dye-exchanged synthetic fluorohectorites ([$ Na_{0.5} $]int.[$ Mg_{2.5} $$ Li_{0.5} $]oct.[$ Si_{4} $]tet.$ O_{10} $$ F_{2} $). Due to its significantly greater layer charge, more organic dye molecules were adsorbed per volume of the fluorohectorite than for montmorillonite. Consequently, the free volume available in the interlayer space for $ H_{3} $$ O^{+} $ diffusion was less for synthetic fluorohectorite than for montmorillonite. Acid attack via interlayer space was, therefore, retarded significantly for fluorohectorite. Acid attack from the external edges of synthetic fluorohectorites was in the range of conventionally applied mica pigment core (fluorophlogopite, ([K]int.[$ Mg_{3} $]oct.[$ AlSi_{3} $]tet.$ O_{10} $(F,OH)2) because of the comparable large diameter of the platelets. Montmorillonite, however, occurs with particle diameters typically <200 nm and the much increased relative contribution of edges to the total surface area also makes them more prone to acid attack and concomitant leaching. Aside from leaching stability, the confinement of organic dyes in the interlayer space restricts rotational and vibrational motions, which in turn stabilizes the dyes typically by ~100°C against thermal decomposition as compared to chloride salts of the dyes. © The Clay Minerals Society 2020 |
| abstract_unstemmed |
Abstract A lustrous appearance and interference-based colors make pearlescent pigments attractive for use in applications such as automotive paints, plastics, consumer electronics, and cosmetics. A combination of interference 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 ratio (~1000), as promising colored cores for pearlescent pigments. Fluorohectorites can adopt a variety of colors by ion-exchange reaction with cationic organic dyes of high absorption coefficient. Unlike related dye-exchanged natural montmorillonite clays, which undergo acid activation accompanied by release of dye at low pH, as is required for subsequent coating with $ TiO_{2} $ in an environment with low pH and elevated temperature, no leaching was observed with dye-exchanged synthetic fluorohectorites ([$ Na_{0.5} $]int.[$ Mg_{2.5} $$ Li_{0.5} $]oct.[$ Si_{4} $]tet.$ O_{10} $$ F_{2} $). Due to its significantly greater layer charge, more organic dye molecules were adsorbed per volume of the fluorohectorite than for montmorillonite. Consequently, the free volume available in the interlayer space for $ H_{3} $$ O^{+} $ diffusion was less for synthetic fluorohectorite than for montmorillonite. Acid attack via interlayer space was, therefore, retarded significantly for fluorohectorite. Acid attack from the external edges of synthetic fluorohectorites was in the range of conventionally applied mica pigment core (fluorophlogopite, ([K]int.[$ Mg_{3} $]oct.[$ AlSi_{3} $]tet.$ O_{10} $(F,OH)2) because of the comparable large diameter of the platelets. Montmorillonite, however, occurs with particle diameters typically <200 nm and the much increased relative contribution of edges to the total surface area also makes them more prone to acid attack and concomitant leaching. Aside from leaching stability, the confinement of organic dyes in the interlayer space restricts rotational and vibrational motions, which in turn stabilizes the dyes typically by ~100°C against thermal decomposition as compared to chloride salts of the dyes. © The Clay Minerals Society 2020 |
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