ISO 26824:2013 pdf download.Particle characterization of particulate systems一Vocabulary.
ISO 26824 establishes a vocabulary of terms and definitions relevant to the particle characterization of particulate systems. It covers such fields as the representation of results of particle size analysis, the descriptive and quantitative representation of particle shape and morphology, sample preparation, specific surface area and porosity characterization and measurement methods including sedimentation, classification, acoustic methods, laser diffraction, dynamic light scattering, single particle light interaction methods, differential electrical mobility analysis and image analysis, in a size scale from nanometre to millimetre.
1 General terms, representation of particle size and classification analysis
1.1
particle
minute piece of matter with defined physical boundaries
Note 1 to entry: A physical boundary can also be described as an interface.
Note 2 to entry: A particle can move as a unit.
Note 3 to entry: This general particle definition applies to nano-objects.
[SOURCE: ISO 14644-6:2007, 2.102, modified — The subject field “’ has been removed and the notes added.1
1.2
agglomerate
collection of weakly or medium strongly bound particles where the resulting external surface area is similar to the sum of the surface areas of the individual components
Note 1 to entry: The forces holding an agglomerate together are weak forces, for example van der Waals forces or simple physical entanglement.
Note 2 to entry: Agglomerates are also termed secondary particles and the original source particles are termed primary particles.
[SOURCE: ISO/TS 27687:2008, 3.2, modified.]
1.3
aggregate
particle comprising strongly bonded or fused particles where the resulting external surface area is significantly smaller than the sum of surface areas of the individual components
Note 1 to entry: The forces holding an aggregate together are strong forces, for example covalent bonds, or those resulting from sintering or complex physical entanglement, or otherwise combined former primary particles.
Note 2 to entry: Aggregates are also termed secondary particles and the original source particles are termed primary particles.
[SOURCE: ISO/TS 27687:2008, 3.3, modified.]
1.4
primary particle
original source particle of agglomerates or aggregates or mixtures of the two
Note 1 to entry: Constituent particles of agglomerates or aggregates at a certain actual state may be primary particles, but often the constituents are aggregates.
Note 2 to entry: Agglomerates and aggregates are also termed secondary particles.
1.5
particle size
x
d
linear dimension of a particle determined by a specified measurement method and under specified measurement conditions
Note 1 to entry: Different methods of analysis are based on the measurement of different physical properties. Independent of the particle property actually measured, the particle size is reported as a linear dimension, e.g. as the equivalent spherical diameter.
Note 2 to entry: Examples of size descriptors are those based at the opening of a sieve or a statistical diameter, e.g. the Feret diameter, measured by image analysis.
Note 3 to entry: In ISO 9276-1:1998, the symbol xis used to denote the particle size. However, it is recognized that the symbol d is also widely used to designate these values. Therefore the symbol x may be replaced by d.
[SOURCE: ISO 9276-1:1998, 4.2, modified.]
1.6:
equivalent spherical diameter
x
d
diameter of a sphere having the same physical properties as the particle in the measurement
Note 1 to entry: Physical properties are for instance the same settling velocity or electrolyte solution displacing volume or projection area under a microscope.
Note 2 to entry: The physical property to which the equivalent diameter refers shall be indicated using a suitable subscript, for example xs for equivalent surface area diameter or xv for equivalent volume diameter.
[SOURCE: ISO 9276-1:1998, 4.2, modified.]
1.7
type of quantity
r
specification of the quantity of a distribution, a cumulative or a density measure
Note 1 to entry: The type is indicated by the general subscript, r, or by the appropriate value of r as follows.ISO 26824 pdf download.