Silicic acid, lithium magnesium sodium salt

Substance identity

Identification

Display Name:

Silicic acid, lithium magnesium sodium salt

EC Number:

258-476-2

EC Name:

Silicic acid, lithium magnesium sodium salt

CAS Number:

53320-86-8

Molecular formula:

Na0.7[Li0.3Mg5.5Si8O20(OH)4]

IUPAC Name:

magnesium(2+) lithium(1+) sodium bis(oxosilanebis(olate))

Type of Substance

Composition:

mono-constituent substance

Origin:

inorganic

Substance Identifiers

Trade name

Laponite® (various grades other than that specified including but not restricted to D, G, RD, SH, XLG)

Laponite® CP (a now obsolete grade)

Optigel® (various grades)

Silikat S-33

Compositions

Boundary Composition(s)

Synthetic hectorite (Type 2 LAPONITE)

Nanoform

State Form:

solid: nanoform

Constituent 1

Reference substance name:

Silicic acid, lithium magnesium sodium salt

EC Number:

258-476-2

EC Name:

Silicic acid, lithium magnesium sodium salt

CAS Number:

53320-86-8

Molecular formula:

Na0.7[Li0.3Mg5.5Si8O20(OH)4]

IUPAC Name:

magnesium(2+) lithium(1+) sodium bis(oxosilanebis(olate))

Characterisation of nanoforms

Type of information reported:

single nanoform

Name of nanoform:

Synthetic hectorite

Shape

Shape description

Shape category:

platelet

Shape:

plate

Pure shape:

yes

Particle size distribution and range

Crystallinity

Specific surface area

Surface functionalisation / treatment

Surface treatment applied:

no

Silicic acid, lithium magnesium sodium salt

Nanoform

State Form:

solid: nanoform

Constituent 1

Reference substance name:

Silicic acid, lithium magnesium sodium salt

EC Number:

258-476-2

EC Name:

Silicic acid, lithium magnesium sodium salt

CAS Number:

53320-86-8

Molecular formula:

Na0.7[Li0.3Mg5.5Si8O20(OH)4]

IUPAC Name:

magnesium(2+) lithium(1+) sodium bis(oxosilanebis(olate))

Characterisation of nanoforms

Type of information reported:

single nanoform

Name of nanoform:

Trioctahedral smectite clay

Shape

Shape description

Shape category:

platelet

Shape:

plate

Pure shape:

yes

Particle size distribution and range

Particle size distribution and range

Shape category:

platelet

Percentile

Percentile 1

Percentile:

D90

Typical value:

ca. 21 nm

Range:

> 12.6 - < 29.4 nm

Percentile 2

Percentile:

D50

Typical value:

ca. 10.63 nm

Range:

> 6 - < 15 nm

Percentile 3

Percentile:

D10

Typical value:

ca. 6 nm

Range:

> 3.6 - < 8.4 nm

Range of lateral dimension 1:

>= 4 - <= 73 nm

Range of lateral dimension 2:

>= 4 - <= 73 nm

Typical aspect ratio (:1):

ca. 25 :1

Range of aspect ratio (:1):

>= 4 - <= 73

Additional information:

LAPONITE Type 2 products are placed on the market in the form of a finely divided granular powder and also in the form of a ready-to-use concentrated dispersion in water.   The powder granules are composed of aggregates of nano-sized particles. The powder granules are micro-sized particles. Hence Laponite Type 2 is supplied to downstream users as a powder product with micro-sized particles. During use in most application fields the user will add LAPONITE Type 2 powderproduct intowaterwithmixing. The aggregates willwet out, hydrate anddisperseintoindividual primary particles, givinga clear, colourless and stable dispersion of nanoparticles, also called a colloidal dispersion. In some application fields, LAPONITE Type 2 powder is wetted out into non-aqueous fluids, such as mineral or silicone oils or polyols. In such cases LAPONITE Type 2 does not disperse into individual primary particles and a colloidal dispersion is not formed. The LAPONITE Type 2 products supplied as a ready-to-use concentrated dispersion in water are already in the form of a stable dispersion of nanoparticles.   Measurementsbyanalyticaltechniquessuchas AFM,TEM, SAXS and comparisons made with similar materials, naturally occurring layered silicates, hectorite and montmorillonite indicatethatLAPONITE Type 2primary particles havealayerstructure,and aredisc-shaped. According to the CommissionRecommendationof18October, 2011,onthedefinitionofnanomaterial (2011/696/EU), 100% of the synthetic silicate component of LAPONITE Type 2 is classified as a nanomaterial. Some grades of LAPONITE Type 2 contain additives; these are either water soluble salts or polymer materials, which are not nanomaterials.   Typical particlesizemeasurementsofLAPONITE Type 2materialsinthesetwodifferentphysicalstates,powderas supplied and dispersed colloid, are shown below:  

Powder as supplied (D50)
D10 = 4.6µm, D50 = 48.2µm, D90 = 124.3µm, D99 = 167.0µm(1) (1)Sympatec particle size analyser, Helos H0399, incorporating a Retsch Vibri feeder, Rodos and venturi(laser deflection on powder dispersed in air)  

Dispersed colloid (Z Ave.)
Z Ave. = 25.4nm(2) Typically, the disc shaped LAPONITE Type 2 primary particle is 0.9-1.0nm in thickness (x Dimension) and 4.0-73.0nm in diameter (y and z Dimensions)
(2) Malvern Zetasizer Nano ZS (Dynamic Light Scattering – DLS – on 1% solids dispersion in deionized water)

The dispersed particles have a negative charge on the surface and a positive charge on the edge of the disc. When LAPONITE Type 2 is dispersed in water and used in a formulation, such as a paint, drilling fluid or cosmetic product, the oppositely charged edges and faces form electrostatic associations with each other. The charged sections of the LAPONITE Type 2 discs can also form associations with oppositely charged sections of other particles, such as dispersion resins and pigments and also molecules, such as polymers that are present in the formulation. These associations form a single continuous network that extends throughout the whole of the container that is holding the formulation. It is this network of particle-particle and particle-polymer associations which develops the very high levels of viscous structure that is typical of formulations containing LAPONITE Type 2. These viscous structures are micro-sized. The viscous structure can be reduced under shear forces, such as mixing or pumping and will build up again when shear forces are removed.   Typical use levels of LAPONITE Type 2 in a formulation can range from 0.1% up to 5% or higher.

Fraction of constituent particles in the size range 1-100 nm:

>= 99 - < 100 %

Crystallinity

Structures

Structure:

crystalline

Name:

Trioctahedral smectite clay

Pure structure:

yes

Crystal system:

other: Trioctahedral smectite clay

Specific surface area

Range of specific surface area:

>= 306 - <= 309 m²/g

Surface functionalisation / treatment

Surface treatment applied:

no

Legal Entity Composition(s)

Synthetic hectorite (Type 2 LAPONITE)

Nanoform

State Form:

solid: nanoform

Constituent 1

Reference substance name:

Silicic acid, lithium magnesium sodium salt

EC Number:

258-476-2

EC Name:

Silicic acid, lithium magnesium sodium salt

CAS Number:

53320-86-8

Molecular formula:

Na0.7[Li0.3Mg5.5Si8O20(OH)4]

IUPAC Name:

magnesium(2+) lithium(1+) sodium bis(oxosilanebis(olate))

Characterisation of nanoforms

Type of information reported:

single nanoform

Name of nanoform:

Synthetic hectorite

Shape

Shape description

Shape category:

platelet

Shape:

plate

Pure shape:

yes

Particle size distribution and range

Crystallinity

Specific surface area

Surface functionalisation / treatment

Surface treatment applied:

no

Silicic acid, lithium magnesium sodium salt

Nanoform

State Form:

solid: nanoform

Constituent 1

Reference substance name:

Silicic acid, lithium magnesium sodium salt

EC Number:

258-476-2

EC Name:

Silicic acid, lithium magnesium sodium salt

CAS Number:

53320-86-8

Molecular formula:

Na0.7[Li0.3Mg5.5Si8O20(OH)4]

IUPAC Name:

magnesium(2+) lithium(1+) sodium bis(oxosilanebis(olate))

Characterisation of nanoforms

Type of information reported:

single nanoform

Name of nanoform:

Trioctahedral smectite clay

Shape

Shape description

Shape category:

platelet

Shape:

plate

Pure shape:

yes

Particle size distribution and range

Particle size distribution and range

Shape category:

platelet

Percentile

Percentile 1

Percentile:

D90

Typical value:

ca. 21 nm

Range:

> 12.6 - < 29.4 nm

Percentile 2

Percentile:

D50

Typical value:

ca. 10.63 nm

Range:

> 6 - < 15 nm

Percentile 3

Percentile:

D10

Typical value:

ca. 6 nm

Range:

> 3.6 - < 8.4 nm

Range of lateral dimension 1:

>= 4 - <= 73 nm

Range of lateral dimension 2:

>= 4 - <= 73 nm

Typical aspect ratio (:1):

ca. 25 :1

Range of aspect ratio (:1):

>= 4 - <= 73

Additional information:

LAPONITE Type 2 products are placed on the market in the form of a finely divided granular powder and also in the form of a ready-to-use concentrated dispersion in water.   The powder granules are composed of aggregates of nano-sized particles. The powder granules are micro-sized particles. Hence Laponite Type 2 is supplied to downstream users as a powder product with micro-sized particles. During use in most application fields the user will add LAPONITE Type 2 powderproduct intowaterwithmixing. The aggregates willwet out, hydrate anddisperseintoindividual primary particles, givinga clear, colourless and stable dispersion of nanoparticles, also called a colloidal dispersion. In some application fields, LAPONITE Type 2 powder is wetted out into non-aqueous fluids, such as mineral or silicone oils or polyols. In such cases LAPONITE Type 2 does not disperse into individual primary particles and a colloidal dispersion is not formed. The LAPONITE Type 2 products supplied as a ready-to-use concentrated dispersion in water are already in the form of a stable dispersion of nanoparticles.   Measurementsbyanalyticaltechniquessuchas AFM,TEM, SAXS and comparisons made with similar materials, naturally occurring layered silicates, hectorite and montmorillonite indicatethatLAPONITE Type 2primary particles havealayerstructure,and aredisc-shaped. According to the CommissionRecommendationof18October, 2011,onthedefinitionofnanomaterial (2011/696/EU), 100% of the synthetic silicate component of LAPONITE Type 2 is classified as a nanomaterial. Some grades of LAPONITE Type 2 contain additives; these are either water soluble salts or polymer materials, which are not nanomaterials.   Typical particlesizemeasurementsofLAPONITE Type 2materialsinthesetwodifferentphysicalstates,powderas supplied and dispersed colloid, are shown below:  

Powder as supplied (D50)
D10 = 4.6µm, D50 = 48.2µm, D90 = 124.3µm, D99 = 167.0µm(1) (1)Sympatec particle size analyser, Helos H0399, incorporating a Retsch Vibri feeder, Rodos and venturi(laser deflection on powder dispersed in air)  

Dispersed colloid (Z Ave.)
Z Ave. = 25.4nm(2) Typically, the disc shaped LAPONITE Type 2 primary particle is 0.9-1.0nm in thickness (x Dimension) and 4.0-73.0nm in diameter (y and z Dimensions)
(2) Malvern Zetasizer Nano ZS (Dynamic Light Scattering – DLS – on 1% solids dispersion in deionized water)

The dispersed particles have a negative charge on the surface and a positive charge on the edge of the disc. When LAPONITE Type 2 is dispersed in water and used in a formulation, such as a paint, drilling fluid or cosmetic product, the oppositely charged edges and faces form electrostatic associations with each other. The charged sections of the LAPONITE Type 2 discs can also form associations with oppositely charged sections of other particles, such as dispersion resins and pigments and also molecules, such as polymers that are present in the formulation. These associations form a single continuous network that extends throughout the whole of the container that is holding the formulation. It is this network of particle-particle and particle-polymer associations which develops the very high levels of viscous structure that is typical of formulations containing LAPONITE Type 2. These viscous structures are micro-sized. The viscous structure can be reduced under shear forces, such as mixing or pumping and will build up again when shear forces are removed.   Typical use levels of LAPONITE Type 2 in a formulation can range from 0.1% up to 5% or higher.

Fraction of constituent particles in the size range 1-100 nm:

>= 99 - < 100 %

Crystallinity

Structures

Structure:

crystalline

Name:

Trioctahedral smectite clay

Pure structure:

yes

Crystal system:

other: Trioctahedral smectite clay

Specific surface area

Range of specific surface area:

>= 306 - <= 309 m²/g

Surface functionalisation / treatment

Surface treatment applied:

no

Silicic acid, lithium magnesium sodium salt

State Form:

solid: particulate/powder

Constituent 1

Reference substance name:

Silicic acid, lithium magnesium sodium salt

EC Number:

258-476-2

EC Name:

Silicic acid, lithium magnesium sodium salt

CAS Number:

53320-86-8

Molecular formula:

Na0.7[Li0.3Mg5.5Si8O20(OH)4]

IUPAC Name:

magnesium(2+) lithium(1+) sodium bis(oxosilanebis(olate))

Silicic acid, lithium magnesium sodium salt

Nanoform

State Form:

solid: nanoform

Constituent 1

Reference substance name:

Silicic acid, lithium magnesium sodium salt

EC Number:

258-476-2

EC Name:

Silicic acid, lithium magnesium sodium salt

CAS Number:

53320-86-8

Molecular formula:

Na0.7[Li0.3Mg5.5Si8O20(OH)4]

IUPAC Name:

magnesium(2+) lithium(1+) sodium bis(oxosilanebis(olate))

Characterisation of nanoforms

Particle size distribution and range

Particle size distribution and range

Range of length:

ca. 62.861 nm

Range of lateral dimension 1:

ca. 62.861 nm

Range of lateral dimension 2:

ca. 62.861 nm

Specific surface area

Range of specific surface area:

ca. 353.433 m²/g

Composition(s) generated upon use

Other types of composition(s)