[article]
| Titre : |
Particle size distribution, measurement, and assessment : principles, features, limitations, and benefits |
| Type de document : |
texte imprimé |
| Auteurs : |
Theodore Provder, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 28-37 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Caractérisation
Chimie analytique
Chromatographie
Evaluation
Granulométrie
Mesure
Sédimentation
Séparation (technologie)
Taille des particules
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The field of particle size distribution (PSD) characterization and measurement has experienced a renaissance over the past 40 years. These changes have been driven by advances in electronics, computer technology, and sensor technology in conjunction with the market pull for PSD methods embodied in cost-effective, user-friendly instrumentation. These changes can be characterized by at least four activities: (1) End user innovation exemplified by techniques such as hydrodynamic chromatography (HDC), capillary hydrodynamic fractionation (CHDF), and field flow fractionation methods (sedimentation, flow, and thermal fields, respectively SdFFF, FIFFF, and ThFFF); (2) Revitalization of older instrumental methods such as gravitational and centrifugal sedimentation; (3) Evolution of research-grade instrumentation into low-cost, routine, user-friendly instrumentation exemplified by dynamic light scattering (DLS); and (4) The attempt to meet extremely difficult technical challenges such as: (a) providing a single hybrid instrument with high resolution over a very broad dynamic range (4+ decades in size; e.g., Fraunhofer/Mie; photozone sensing/DLS); (b) PSD measurement of concentrated dispersions (acoustophoretic, dielectric measurements, fiber optic DLS (FOQELS); (c) in-situ process particle size sensors (in-line or at-line, e.g., FOQELS); (d) routine measurement of particle shape and structure (e.g., image analysis). Instrumental methods resulting from these activities are discussed in terms of measurement principles and the strengths and weaknesses of these methods for characterizing PSDs. Business and societal driving forces will impact customer perceived instrumentation and knowledge needs for the future and the ability to meet the specific difficult technical challenges in particle size distribution characterization mentioned above. Anticipated progress toward meeting these technical challenges in particle size distribution characterization mentioned above is discussed. |
| Note de contenu : |
- END USER INNOVATION - COMMERCIAL DEVELOPMENT : Hydrodynamic Chromatography (HDC) - Capillary Hydrodynamic Fractionation (CHDF) - Field Flow Fractionation (FFF)
- REVITALIZATION OF OLDER INSTRUMENTAL METHODS : Gravitational and centrifugal sedimentation
- EVOLUTION OF A RESEARCH INSTRUMENT INTO A ROUTINE USER-FRIENDLY INSTRUMENT : Dynamic Light Scattering (DLS, PCS, QELS)
- ATTEMPTS TO MEET EXTREMELY DIFFICULT TECHNICAL CHALLENGES
- Fig. 1 : Schematic of hydrodynamic chromatography separation mechanism and operative forces
- Fig. 2 : Features, benefits, and limitations of hydrodynamic chromatography for PSD analysis
- Fig. 3 : Operational factors and data analysis considerations influencing CHDF PSD analysis
- Fig. 4 : Features, benefits, and limitations of CHDF for PSD characterization
- Fig. 5 : Schematic of FFF instrumentation, separation mechanisms, and channel configurations for SdFFF, FIFFF
- Fig. 6 : FFF separation of mixtures of monodisperse latex beads. a) Field programmed SdFFF with rpm = 10 000 at t = 0. b) FIFFF with polypropylene membrane at 42.9 ml/min. c) ThFFF in acetonitrile with ΔT = 170°C. d) StFFF at 38 ml/min and 11000 rpm
- Fig. 7 : Features, benefits, and limitations of FFF (SdFFF, FIFFF, ThFFF, and StFFF) for PSD characterization
- Fig. 8 : Variations in sedimentation instrumentation and operational factors
- Fig. 9 : Equations of motion and stockes' law for gravitational and centrifugal sedimentation
- Fig. 10 : Line start separation of a nine-component mixture of polystyrene latex standards (107, 298, 496, 597, 707, 895, 993 µm)
- Fig. 11 : Features, benefits, and limitations of sedimentation methods for PSD characterizaton
- Fig. 12 : Simplified representation of scattering intensity l(t) and corresponding autocorrelation function C(t)
- Fig. 13 : Schematic diagram of a DLS particle sizinginstrument, including autodilution (NICOMP Mdel 370)
- Fig. 14 : Features, benefits, and limitations of DLS for PSD characterization
- Fig. 15 : Schematic diagram of the auto-dilution apparatus and optical particle sensor (light blockage)
- Fig. 16 : Separation of a hexamodal mixture of monodisperse particle size standards by SPOS
- Fig. 17 : Combined SPOS/DLS particle size distribution |
| En ligne : |
https://drive.google.com/file/d/1LTtdDl7x5D9xMy9rTSzO4qY_ql2VpsY1/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34726 |
in COATINGS TECH > Vol. 17, N° 10 (10/2020) . - p. 28-37
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Particle size distribution, measurement, and assessment : principles, features, limitations, and benefits in COATINGS TECH, Vol. 17, N° 10 (10/2020)
