Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
Journals
Powders
Sections
Multidimensional Particle Properties: Characterization, Description, Separation
share announcement

Multidimensional Particle Properties: Characterization, Description, Separation

A topical collection in Powders (ISSN 2674-0516).

Viewed by 4126

Editors

Prof. Dr. Urs Alexander Peuker

E-Mail Website
Collection Editor
Institute of Mechanical Process Engineering and Mineral Processing, TU Bergakademie Freiberg, 09599 Freiberg, Germany
Interests: mechanical separation processes; solid liquid separation; recycling and mineral processing; particle-particle interactions; particle characterization
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Alfred P. Weber

E-Mail Website
Collection Editor
Institute of Particle Technology, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, Germany
Interests: particle classification; surface modifications; mechanical properties; charging behavior; cold and hot plasmas
Prof. Dr. Einar Kruis

E-Mail Website
Collection Editor
Institute for Technology of Nanostructures, Universität Duisburg-Essen, 47057 Duisburg, Germany
Interests: nanoparticles; aerosols; nanomaterials and thin films; aerosol reactors; population balances; size classification; aerosol instrumentation; deep learning
Prof. Dr. Doris Segets

E-Mail Website
Collection Editor
Chair for Particle Science and Technology, University of Duisburg-Essen (UDE), 47057 Duisburg, Germany
Interests: functional electrochemical energy materials; nanoparticle processing; colloids; interface-dominated systems

Topical Collection Information

Dear Colleagues,

In 2016 the Senate of the German Science Foundation implemented the priority program 2045 “MehrDimPart - highly specific multidimensional fractionation of fine particles with technical relevance”. The joint research within the priority program aims at the research on and development of technological approaches which allow the separation/fractionation of fine particles below 10 μm. This separation has to meet more than one separation criteria (e.g., size and composition or size and shape), which ultimately allows the production of highly specific particle systems.

Highly specific particle systems form the basis for high-quality industrial products. Intermediate particle systems with defined multi-dimensional specifications are essential and quality-determining for the production of ceramic and powder metallurgical components, coatings, printed products, porous functional structures, particle-reinforced polymers, electrodes in electrochemical energy storage systems or electronic assemblies, for example, in the field of printed electronics.

Downstream of particle production via synthesis or comminution, the particle systems have to undergo further process steps to reach the specified quality (i.e., size distribution and distribution of further properties). These steps include fractionation, that is, the selective separation of the particle system according to particle characteristics. Comparable processes are also used in mineral processing technology to extract particles containing valuable substances from natural or secondary raw materials.

Since the characteristic lengths of both the technical structures and the primary and secondary raw materials are continuously decreasing, fine, highly specific particle systems will have to be processed or produced in the future. The technology required for this is reaching its limits since in this size range the physical separation principles used lose their effectiveness and selectivity.

This Topical Collection addresses the characterization and separation/fractionation of particle systems with multi-dimensional properties. The separation/fractionation is therefore following more than one particle property, and thus is multi-dimensional. Different technological approaches will be presented, as will fundamental methods for process control and multidimensional particle characterization. The processes, technologies, and approaches are grouped into three classes: investigations on fundamental mechanisms for separation, applications of new process concepts and applications of established separation/fractionation concepts adopted to the size scale.

Prof. Dr. Urs Alexander Peuker
Prof. Dr. Alfred P. Weber
Prof. Dr. Einar Kruis
Prof. Dr. Doris Segets
Collection Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the collection website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Powders is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • multidimensional particle properties
  • separation features
  • multidimensional separation function
  • multidimensional tromp curve
  • selective agglomeration
  • flow field fractionation
  • electrostatic separation
  • forced triboelectric charging
  • separation at interfaces
  • particle characterization
  • aspect ratio/intergrowth
  • flotation
  • electrophoresis
  • multivariate transfer function

Published Papers (4 papers)

Download All Papers

2024

Jump to: 2023

16 pages, 1750 KiB  
Article
Multidimensional Separation by Magnetic Seeded Filtration: Theoretical Study
by Frank Rhein, Haoran Ji and Hermann Nirschl
Powders 2024, 3(2), 217-232; https://doi.org/10.3390/powders3020014 - 22 Apr 2024
Viewed by 279
Abstract
Magnetic seeded filtration (MSF) is a multidimensional solid–liquid separation process capable of fractionating a multimaterial suspension based on particle size and surface properties. It relies on the selective hetero-agglomeration between nonmagnetic target and magnetic seed particles followed by a magnetic separation. Experimental investigations [...] Read more.
Magnetic seeded filtration (MSF) is a multidimensional solid–liquid separation process capable of fractionating a multimaterial suspension based on particle size and surface properties. It relies on the selective hetero-agglomeration between nonmagnetic target and magnetic seed particles followed by a magnetic separation. Experimental investigations of multimaterial suspensions are challenging and limited. Therefore, a Monte Carlo model for the simulation of hetero-agglomeration processes is developed, validated, and compared to a discrete population balance model. The numerical investigation of both charge-based and hydrophobicity-based separation in an 11-material system, using synthetic agglomeration kernels based on real-world observations, yields results consistent with prior experimental studies and expectations: Although a multidimensional separation is indeed possible, unwanted hetero-agglomeration between target particles results in a reduced selectivity. This effect is more pronounced when separation is based on a dissimilarity rather than a similarity in the separation criterion and emphasizes the advantages of hydrophobicity-based systems. For the first time, 2D grade efficiency functions T(φ,d) are presented for MSF. However, it is shown that these functions strongly depend on the initial state of the suspension, which casts doubt on their general definition for agglomeration-based processes and underlines the importance of a simulation tool like the developed MC model. Full article
►▼ Show Figures

Figure 1

11 pages, 9413 KiB  
Project Report
Dielectrophoretic Particle Chromatography: From Batch Processing to Semi-Continuous High-Throughput Separation
by Jasper Giesler, Laura Weirauch, Jorg Thöming, Georg R. Pesch and Michael Baune
Powders 2024, 3(1), 54-64; https://doi.org/10.3390/powders3010005 - 06 Feb 2024
Viewed by 619
Abstract
The development of highly selective separation processes is a focus of current research. In 2016, the German Science Foundation funded a priority program SPP 2045 “MehrDimPart—highly specific multidimensional fractionation of fine particles with technical relevance” that aims to develop new or enhance existing [...] Read more.
The development of highly selective separation processes is a focus of current research. In 2016, the German Science Foundation funded a priority program SPP 2045 “MehrDimPart—highly specific multidimensional fractionation of fine particles with technical relevance” that aims to develop new or enhance existing approaches for the separation of nano- and micrometer-sized particles. Dielectrophoretic separators achieve highly selective separations of (bio-)particles in microfluidic devices or can handle large quantities when non-selective separation is sufficient. Recently, separator designs were developed that aim to combine a high throughput and high selectivity. Here, we summarize the development from a microfluidic fast chromatographic separation via frequency modulated dielectrophoretic particle chromatography (DPC) toward a macrofluidic high throughput separation. Further, we provide a starting point for future work by providing new experimental data demonstrating for the first time the trapping of 200 nm polystyrene particles in a dielectrophoretic high-throughput separator that uses printed circuit boards as alternatives for expensive electrode arrays. Full article
►▼ Show Figures

Figure 1

2023

Jump to: 2024

19 pages, 1164 KiB  
Article
Multidimensional Separation by Magnetic Seeded Filtration: Experimental Studies
by Frank Rhein, Ouwen Zhai, Eric Schmid and Hermann Nirschl
Powders 2023, 2(3), 588-606; https://doi.org/10.3390/powders2030037 - 01 Aug 2023
Cited by 1 | Viewed by 1185
Abstract
The current state of separation technology often neglects the multidimensional nature of real particle systems, which are distributed not only in terms of size, but also in terms of other properties, such as surface charge. Therefore, the aim of this study is to [...] Read more.
The current state of separation technology often neglects the multidimensional nature of real particle systems, which are distributed not only in terms of size, but also in terms of other properties, such as surface charge. Therefore, the aim of this study is to experimentally investigate the applicability of magnetic seeded filtration as a multidimensional separation process. Magnetic seed particles are added to a multisubstance suspension, and a selective heteroagglomeration with the nonmagnetic target particles is induced, allowing for an easy subsequent magnetic separation. The results show that high separation efficiencies can be achieved and that the parameters pH and ionic strength govern the agglomeration process. Selective separation based on surface charge was observed, but undesirable heteroagglomeration processes between the target particles lead to a loss of selectivity. Particle size was clearly identified as a second relevant separation feature, and its partially opposite influence on collision frequency and collision efficiency was discussed. Finally, experimental data of multidimensional separation are presented, in which a size-distributed two-substance suspension is separated into defined size and material fractions in a single process step. This study highlights the need for multidimensional evaluation in general and the potential of magnetic seeded filtration as a promising separation technique. Full article
►▼ Show Figures

Figure 1

19 pages, 8777 KiB  
Article
Parametric Stochastic Modeling of Particle Descriptor Vectors for Studying the Influence of Ultrafine Particle Wettability and Morphology on Flotation-Based Separation Behavior
by Thomas Wilhelm, Johanna Sygusch, Orkun Furat, Kai Bachmann, Martin Rudolph and Volker Schmidt
Powders 2023, 2(2), 353-371; https://doi.org/10.3390/powders2020021 - 11 May 2023
Viewed by 1110
Abstract
Practically all particle separation processes depend on more than one particulate property. In the case of the industrially important froth flotation separation, these properties concern wettability, composition, size and shape. Therefore, it is useful to analyze different particle descriptors when studying the influence [...] Read more.
Practically all particle separation processes depend on more than one particulate property. In the case of the industrially important froth flotation separation, these properties concern wettability, composition, size and shape. Therefore, it is useful to analyze different particle descriptors when studying the influence of particle wettability and morphology on the separation behavior of particle systems. A common tool for classifying particle separation processes are Tromp functions. Recently, multivariate Tromp functions, computed by means of non-parametric kernel density estimation, have emerged which characterize the separation behavior with respect to multidimensional vectors of particle descriptors. In the present paper, an alternative parametric approach based on copulas is proposed in order to compute multivariate Tromp functions and, in this way, to characterize the separation behavior of particle systems. In particular, bivariate Tromp functions for the area-equivalent diameter and aspect ratio of glass particles with different morphologies and surface modification have been computed, based on image characterization by means of mineral liberation analysis (MLA). Comparing the obtained Tromp functions with one another reveals the combined influence of multiple factors, in this case particle wettability, morphology and size, on the separation behavior and introduces an innovative approach for evaluating multidimensional separation. In addition, we extend the parametric copula-based method for the computation of multivariate Tromp functions, in order to characterize separation processes, also in the case when image measurements are not available for all separated fractions. Full article
►▼ Show Figures

Figure 1

Back to TopTop