## Relation between the reactivity and surface area of gypsum

01062019· Specific surface area determined by the adsorption of methylene blue can be used to predict the gypsum reactivity • Specific surface area determined by BET isotherm is not suitable for predicting of the gypsum reactivity • Specific surface area determined by mercury intrusion porosimetry cannot be used to predict the gypsum reactivity

Cited by: 4## How do specific surface area and particle size

15022021· An empirical exponential model was recently used to account for observed changes in specific surface area by dissolving gypsum powders : (24) s s 0 = 1 + a 1 − e − b 1 − m (t) ∕ m 0 = 1 + a 1 − e − b V M c − c 0 ∕ m 0 where s 0 is the initial specific surface area and {a, b} are experimentallydetermined parameters

Cited by: 1## General Chapters: <846> SPECIFIC SURFACE AREA

The specific surface area of a powder is determined by physical adsorption of a gas on the surface of the solid and by calculating the amount of adsorbate gas corresponding to a monomolecular layer on the surface

文件大小: 252KB## Synthetic Determination of Specific Density, Specific

Synthetic Determination of Specific Density, Specific Surface Area and Particle Size Distribution of Cementitious Powder Materials Dr Duwa Hamisi Chengula a *, Prof Joseph J Msambichaka b, Prof Bernhard Middendorf c a,b Mbeya University of Science and Technology, College of Engineering and Technology, Department of Built Environment Engineering PoBox 131 Mbeya, Tanzania c

## Specific surface area determination methods, devices, and

18042008· A review of available methods for specific surface area determination for various dispersed materials is presented Fundamental differences between the currently used devices and procedures of the analysis of external and total specific surface, including those applicable to powders of superhard materials and refractory compounds, are discussed Some data on specific surface of synthetic diamond grits, micron powders, and submicron powders

Cited by: 4## ISO ISO 9277:2010 Determination of the specific

ISO 9277:2010 specifies the determination of the overall specific external and internal surface area of disperse (eg nanopowders) or porous solids by measuring the amount of physically adsorbed gas according to the Brunauer, Emmett and Teller (BET) method It takes account of the International Union for Pure and Applied Chemistry (IUPAC) recommendations of 1984 and 1994

类别: p## BET (Brunauer, Emmett and Teller) | Particle Analytical

The specific surface area of a powder is determined by physical adsorption of a gas on the surface of the solid and by calculating the amount of adsorbate gas corresponding to a monomolecular layer on the surface Physical adsorption results from relatively weak forces (van der Waals forces) between the adsorbate gas molecules and the adsorbent surface area of the test powder The determination is

## RELATIONSHIP BETWEEN THE SPECIFIC SURFACE AREA

an indirect analysis technique for the estimation of specific surface area Particle size determination by the laser diffraction technique [3] allows, a priori, the specific surface area of materials to be obtained from the particle size distribution data, and other physical parameters such as material density from Equation 2 (2) where: V i

## Specific surface area Wikipedia

Specific surface area (SSA) is a property of solids defined as the total surface area of a material per unit of mass, (with units of m 2 /kg or m 2 /g) or solid or bulk volume (units of m 2 /m 3 or m −1) It is a physical value that can be used to determine the type and properties of a material (eg soil or snow)

## General Chapters: <846> SPECIFIC SURFACE AREA

The specific surface area of a powder is determined by physical adsorption of a gas on the surface of the solid and by calculating the amount of adsorbate gas corresponding to a monomolecular layer on the surface Physical adsorption results from relatively weak forces (van der Waals forces) between the adsorbate gas molecules and the adsorbent surface of the test powder The determination is usually

## 11/22/2016 30(4) Harmonization: <846> SPECIFIC SURFACE AREA

Int ro duc t io n — The specific surface area of a powder is determined by physical adsorption of a gas on the surface of the solid and by measuring the amount of adsorbate gas corresponding to a single layer (monolayer) on the surface

## IS 5534 (1969): Method for determination of specific

71 The specific surface S, shall be determined by the formula: s =g (dAL W)3P 1 0 d [ La* W2*dCF 1 where S, = specific surface area of the test sample in cm2/g, d = density of test sample in g/cm3, A = area of crosssection of permeability cell in cm2,

## Determination of the specific surface area of solids by

A strategy for specific surface area determination of microporous materials (type I isotherms) is described in Annex C The method specified involves the determination of the amount of adsorbate or adsorptive gas required to cover the external and the accessible internal pore surfaces of a solid (see Figure 2) with a complete

## RELATIONSHIP BETWEEN THE SPECIFIC SURFACE AREA

an indirect analysis technique for the estimation of specific surface area Particle size determination by the laser diffraction technique [3] allows, a priori, the specific surface area of materials to be obtained from the particle size distribution data, and other physical parameters such as material density from Equation 2 (2) where: V i

## IS 11578 (1986): Method for determination of specific

21011986· 11 This standard covers the method of determining the specific surface area of powdersor porous particles by measuring the quantity of nitrogen which completely covers the surface with a single layer of adsorbed nitrogen molecules 2 TERMINOLOGY

## Synthetic Determination of Specific Density, Specific

to compute specific surface area of material as given in equation 2 [6] M s = ρV 2 1 Where: Ms – weight of sample to fill half of a tin volume (gm) V – volume of a tin (cm 3) ρ – density of a sample (gm/cm 3) SSA = K ρ x e 3 (1−e) x √t ɳ 2 Where: SSA – specific surface area (cm 2 /gm) K – apparatus constant at room temperature and humidity

## Surface characterization: BET surface/specific surface

Gas adsorption: Determination of the specific surface area (BET surface area) The determination of specific surface areas represents a major task regarding the characterization of porous and finelydispersed solids Gas adsorption is the appropriate method to solve this task If a gas gets in contact with a solid material a part of the dosed gas molecules is being adsorbed onto the surface of this material

## Powders SlideShare

12102016· •Gas Adsorption The surface area of powdered materials can be measured by adsorption of solute from solution or of a gas This method results in the specific surface area (area/unit mass) Usually, an inert gas, such as nitrogen, is adsorbed as a monolayer and the total volume of gas adsorbed is used to calculate the specific surface area, which in turn provides information on the particle size

## 23: BET Surface Area Analysis of Nanoparticles

The Surface Area Determination of MetalOrganic Frameworks; Introduction In the past few years, nanotechnology research has expanded out of the chemistry department and into the fields of medicine, energy, aerospace and even computing and information technology With bulk materials, the surface area to volume is insignificant in relation to the number of atoms in the bulk, however when the

## IS 5534 (1969): Method for determination of specific

71 The specific surface S, shall be determined by the formula: s =g (dAL W)3P 1 0 d [ La* W2*dCF 1 where S, = specific surface area of the test sample in cm2/g, d = density of test sample in g/cm3, A = area of crosssection of permeability cell in cm2,

## BS 43592:1982 Determination of the specific surface

BS 43594:1995 Determination of the specific surface area of powders Recommendations for methods of determination of metal surface area using gas adsorption techniques BS EN 1966:2018 TC Tracked Changes Methods of testing cement Determination of fineness

## 11/22/2016 30(4) Harmonization: <846> SPECIFIC SURFACE AREA

Int ro duc t io n — The specific surface area of a powder is determined by physical adsorption of a gas on the surface of the solid and by measuring the amount of adsorbate gas corresponding to a single layer (monolayer) on the surface

## IS 11578 (1986): Method for determination of specific

21011986· 11 This standard covers the method of determining the specific surface area of powdersor porous particles by measuring the quantity of nitrogen which completely covers the surface with a single layer of adsorbed nitrogen molecules 2 TERMINOLOGY

## Specific surface area determination of the material to

The specific surface, or specific surface area, is the total surface of all the crushed material (usually dispersed or porous ) particles divided by the mass of the test material The material specific surface consists of the total surface areas of all its grains The smaller the size of these grains (grinding is thinner), the greater the area of their total surface If the particles of the crushed material have a developed porous surface, the surface area

## ISO 10070:1991(en), Metallic powders ? Determination of

For a given particle shape, the values of permeability and porosity can be used to calculate a specific surface area of the powder by means of equations of different types The surface area so calculated includes only those walls of the pores in the bed which are swept by the gas flow

## Evaluation of Physical and Chemical Properties of Red

Specific surface area (m2/g) 81472 Swell index, Cs (%) 180 Chemical properties Cation Exchange Capacity (CEC),meq/100g 1243 The result for this study will be compared with the properties of ordinary gypsum (white gypsum) and red gypsum as shown in Table 42 Table 42: Property of White Gypsum against Red Gypsum [20]

## Gypsum Archives Acmel Labo

Manual air permeability tester according to Blaine for the determination of the specific surface (grinding fineness / Blaine value) of cement and other powdered materials in accordance with EN 196 and ASTM C 204 Design Lacquered steel sheet stand with mounted Utube manometer The manometer is equipped with a conical seat for the measuring cell and level marks for the manometer fluid The measuring cell

## Gypsum Wikipedia

Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard/sidewalk chalk, and drywall A massive finegrained white or lightly tinted variety of gypsum, called alabaster, has been used for sculpture by many cultures including Ancient Egypt,

## 23: BET Surface Area Analysis of Nanoparticles

The Surface Area Determination of MetalOrganic Frameworks; Introduction In the past few years, nanotechnology research has expanded out of the chemistry department and into the fields of medicine, energy, aerospace and even computing and information technology With bulk materials, the surface area to volume is insignificant in relation to the number of atoms in the bulk, however when the

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## Relation between the reactivity and surface area of gypsum

01062019· Specific surface area determined by the adsorption of methylene blue can be used to predict the gypsum reactivity • Specific surface area determined by BET isotherm is not suitable for predicting of the gypsum reactivity • Specific surface area determined by mercury intrusion porosimetry cannot be used to predict the gypsum reactivity

## How do specific surface area and particle size

15022021· An empirical exponential model was recently used to account for observed changes in specific surface area by dissolving gypsum powders : (24) s s 0 = 1 + a 1 − e − b 1 − m (t) ∕ m 0 = 1 + a 1 − e − b V M c − c 0 ∕ m 0 where s 0 is the initial specific surface area and {a, b} are experimentallydetermined parameters

## General Chapters: <846> SPECIFIC SURFACE AREA

The specific surface area of a powder is determined by physical adsorption of a gas on the surface of the solid and by calculating the amount of adsorbate gas corresponding to a monomolecular layer on the surface

## Synthetic Determination of Specific Density, Specific

Synthetic Determination of Specific Density, Specific Surface Area and Particle Size Distribution of Cementitious Powder Materials Dr Duwa Hamisi Chengula a *, Prof Joseph J Msambichaka b, Prof Bernhard Middendorf c a,b Mbeya University of Science and Technology, College of Engineering and Technology, Department of Built Environment Engineering PoBox 131 Mbeya, Tanzania c

## Specific surface area determination methods, devices, and

18042008· A review of available methods for specific surface area determination for various dispersed materials is presented Fundamental differences between the currently used devices and procedures of the analysis of external and total specific surface, including those applicable to powders of superhard materials and refractory compounds, are discussed Some data on specific surface of synthetic diamond grits, micron powders, and submicron powders

## ISO ISO 9277:2010 Determination of the specific

ISO 9277:2010 specifies the determination of the overall specific external and internal surface area of disperse (eg nanopowders) or porous solids by measuring the amount of physically adsorbed gas according to the Brunauer, Emmett and Teller (BET) method It takes account of the International Union for Pure and Applied Chemistry (IUPAC) recommendations of 1984 and 1994

## BET (Brunauer, Emmett and Teller) | Particle Analytical

The specific surface area of a powder is determined by physical adsorption of a gas on the surface of the solid and by calculating the amount of adsorbate gas corresponding to a monomolecular layer on the surface Physical adsorption results from relatively weak forces (van der Waals forces) between the adsorbate gas molecules and the adsorbent surface area of the test powder The determination is

## RELATIONSHIP BETWEEN THE SPECIFIC SURFACE AREA

an indirect analysis technique for the estimation of specific surface area Particle size determination by the laser diffraction technique [3] allows, a priori, the specific surface area of materials to be obtained from the particle size distribution data, and other physical parameters such as material density from Equation 2 (2) where: V i

## Specific surface area Wikipedia

Specific surface area (SSA) is a property of solids defined as the total surface area of a material per unit of mass, (with units of m 2 /kg or m 2 /g) or solid or bulk volume (units of m 2 /m 3 or m −1) It is a physical value that can be used to determine the type and properties of a material (eg soil or snow)

## General Chapters: <846> SPECIFIC SURFACE AREA

The specific surface area of a powder is determined by physical adsorption of a gas on the surface of the solid and by calculating the amount of adsorbate gas corresponding to a monomolecular layer on the surface Physical adsorption results from relatively weak forces (van der Waals forces) between the adsorbate gas molecules and the adsorbent surface of the test powder The determination is usually

## 11/22/2016 30(4) Harmonization: <846> SPECIFIC SURFACE AREA

Int ro duc t io n — The specific surface area of a powder is determined by physical adsorption of a gas on the surface of the solid and by measuring the amount of adsorbate gas corresponding to a single layer (monolayer) on the surface

## IS 5534 (1969): Method for determination of specific

71 The specific surface S, shall be determined by the formula: s =g (dAL W)3P 1 0 d [ La* W2*dCF 1 where S, = specific surface area of the test sample in cm2/g, d = density of test sample in g/cm3, A = area of crosssection of permeability cell in cm2,

## Determination of the specific surface area of solids by

A strategy for specific surface area determination of microporous materials (type I isotherms) is described in Annex C The method specified involves the determination of the amount of adsorbate or adsorptive gas required to cover the external and the accessible internal pore surfaces of a solid (see Figure 2) with a complete

## RELATIONSHIP BETWEEN THE SPECIFIC SURFACE AREA

an indirect analysis technique for the estimation of specific surface area Particle size determination by the laser diffraction technique [3] allows, a priori, the specific surface area of materials to be obtained from the particle size distribution data, and other physical parameters such as material density from Equation 2 (2) where: V i

## IS 11578 (1986): Method for determination of specific

21011986· 11 This standard covers the method of determining the specific surface area of powdersor porous particles by measuring the quantity of nitrogen which completely covers the surface with a single layer of adsorbed nitrogen molecules 2 TERMINOLOGY

## Synthetic Determination of Specific Density, Specific

to compute specific surface area of material as given in equation 2 [6] M s = ρV 2 1 Where: Ms – weight of sample to fill half of a tin volume (gm) V – volume of a tin (cm 3) ρ – density of a sample (gm/cm 3) SSA = K ρ x e 3 (1−e) x √t ɳ 2 Where: SSA – specific surface area (cm 2 /gm) K – apparatus constant at room temperature and humidity

## Surface characterization: BET surface/specific surface

Gas adsorption: Determination of the specific surface area (BET surface area) The determination of specific surface areas represents a major task regarding the characterization of porous and finelydispersed solids Gas adsorption is the appropriate method to solve this task If a gas gets in contact with a solid material a part of the dosed gas molecules is being adsorbed onto the surface of this material

## Powders SlideShare

12102016· •Gas Adsorption The surface area of powdered materials can be measured by adsorption of solute from solution or of a gas This method results in the specific surface area (area/unit mass) Usually, an inert gas, such as nitrogen, is adsorbed as a monolayer and the total volume of gas adsorbed is used to calculate the specific surface area, which in turn provides information on the particle size

## 23: BET Surface Area Analysis of Nanoparticles

The Surface Area Determination of MetalOrganic Frameworks; Introduction In the past few years, nanotechnology research has expanded out of the chemistry department and into the fields of medicine, energy, aerospace and even computing and information technology With bulk materials, the surface area to volume is insignificant in relation to the number of atoms in the bulk, however when the

## IS 5534 (1969): Method for determination of specific

71 The specific surface S, shall be determined by the formula: s =g (dAL W)3P 1 0 d [ La* W2*dCF 1 where S, = specific surface area of the test sample in cm2/g, d = density of test sample in g/cm3, A = area of crosssection of permeability cell in cm2,

## BS 43592:1982 Determination of the specific surface

BS 43594:1995 Determination of the specific surface area of powders Recommendations for methods of determination of metal surface area using gas adsorption techniques BS EN 1966:2018 TC Tracked Changes Methods of testing cement Determination of fineness

## 11/22/2016 30(4) Harmonization: <846> SPECIFIC SURFACE AREA

Int ro duc t io n — The specific surface area of a powder is determined by physical adsorption of a gas on the surface of the solid and by measuring the amount of adsorbate gas corresponding to a single layer (monolayer) on the surface

## IS 11578 (1986): Method for determination of specific

21011986· 11 This standard covers the method of determining the specific surface area of powdersor porous particles by measuring the quantity of nitrogen which completely covers the surface with a single layer of adsorbed nitrogen molecules 2 TERMINOLOGY

## Specific surface area determination of the material to

The specific surface, or specific surface area, is the total surface of all the crushed material (usually dispersed or porous ) particles divided by the mass of the test material The material specific surface consists of the total surface areas of all its grains The smaller the size of these grains (grinding is thinner), the greater the area of their total surface If the particles of the crushed material have a developed porous surface, the surface area

## ISO 10070:1991(en), Metallic powders ? Determination of

For a given particle shape, the values of permeability and porosity can be used to calculate a specific surface area of the powder by means of equations of different types The surface area so calculated includes only those walls of the pores in the bed which are swept by the gas flow

## Evaluation of Physical and Chemical Properties of Red

Specific surface area (m2/g) 81472 Swell index, Cs (%) 180 Chemical properties Cation Exchange Capacity (CEC),meq/100g 1243 The result for this study will be compared with the properties of ordinary gypsum (white gypsum) and red gypsum as shown in Table 42 Table 42: Property of White Gypsum against Red Gypsum [20]

## Gypsum Archives Acmel Labo

Manual air permeability tester according to Blaine for the determination of the specific surface (grinding fineness / Blaine value) of cement and other powdered materials in accordance with EN 196 and ASTM C 204 Design Lacquered steel sheet stand with mounted Utube manometer The manometer is equipped with a conical seat for the measuring cell and level marks for the manometer fluid The measuring cell

## Gypsum Wikipedia

Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard/sidewalk chalk, and drywall A massive finegrained white or lightly tinted variety of gypsum, called alabaster, has been used for sculpture by many cultures including Ancient Egypt,

## 23: BET Surface Area Analysis of Nanoparticles

The Surface Area Determination of MetalOrganic Frameworks; Introduction In the past few years, nanotechnology research has expanded out of the chemistry department and into the fields of medicine, energy, aerospace and even computing and information technology With bulk materials, the surface area to volume is insignificant in relation to the number of atoms in the bulk, however when the

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