scholarly journals Characterization of the MISG soot generator with an atmospheric simulation chamber

2021 ◽  
Author(s):  
Virginia Vernocchi ◽  
Marco Brunoldi ◽  
Silvia Giulia Danelli ◽  
Franco Parodi ◽  
Paolo Prati ◽  
...  
Keyword(s):  
Particle Size ◽  
Absorption Coefficient ◽  
Optical Behaviour ◽  
Specific Difference ◽  
Propane Combustion ◽  
Soot Particles ◽  
Quartz Fibre ◽  
Comprehensive Characterization

Abstract. The performance of a Mini-Inverted Soot Generator (MISG) has been investigated at ChAMBRe (Chamber for Aerosol Modelling and Bio-aerosol Research) by studying the properties of soot particles generated by ethylene and propane combustion. Starting from an extensive classification of combustion conditions and resulting flame shapes, the MISG exhaust was characterized in terms of concentration of emitted particles and gases, particle size distribution and optical properties. Soot particles were also collected on quartz fibre filters and then analysed by optical and thermal-optical techniques, to measure the spectral dependence of the absorption coefficient b_abs, and their composition in terms of Elemental and Organic Carbon (EC and OC). Significant differences could be observed when the MISG is fuelled with ethylene and propane both in terms of particle size and optical behaviour (i.e., absorption coefficient). Values of the Mass Absorption Coefficient (MAC) and of the Angstrom Absorption Exponent (AAE) turned out to be compatible with the literature, even if with some specific difference. The comprehensive characterization of the MISG soot particles is an important piece of information to design and perform experiments in atmospheric simulation chambers.

Characterization of Electrophoretic Lipoprotein Fractions: Immunochemical and Electron Microscopic Studies

1972 ◽  
Vol 18 (6) ◽  
pp. 534-538
Author(s):  
Mario Werner ◽  
Albert L Jones
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Electrophoretic Pattern ◽  
Electron Microscopic ◽  
Lipoprotein Subfractions ◽  
New Techniques ◽  
Microscopic Studies ◽  
Insight Into

Abstract To improve the characterization of electrophoretic lipoprotein subfractions, we developed two new techniques for analyzing lipoproteins after electrophoresis on thin agarose layers. Overlay with antisera exactly localizes specific apoproteins without any distortion caused by antigen diffusion; electron microscopy of eluted fractions determines the varying particle-size distribution. Applied together, these methods can detect individual differences between hyperlipemic samples that are not immediately apparent in the electrophoretic pattern, and should provide valuable new insight into the classification of hyperlipoproteinemias.

scholarly journals Comprehensive characterization of sooting butane jet flames, Part 2: Temperature and soot particle size

2021 ◽  
pp. 111596
Author(s):  
I.A. Mulla ◽  
J. Yon ◽  
D. Honoré ◽  
C. Lacour ◽  
A. Cessou ◽  
...  
Keyword(s):  
Particle Size ◽  
Soot Particle ◽  
Jet Flames ◽  
Comprehensive Characterization

scholarly journals Pore classification in the characterization of porous materials: A perspective

2007 ◽  
Vol 5 (2) ◽  
pp. 385-395 ◽  
Author(s):  
Borislav Zdravkov ◽  
Jiří Čermák ◽  
Martin Šefara ◽  
Josef Janků
Keyword(s):  
Decision Making ◽  
Porous Materials ◽  
Pore Size ◽  
Porous Solids ◽  
General Description ◽  
Pore Characteristics ◽  
Global Classification ◽  
Comprehensive Characterization

AbstractClassification of pores is one of the basic requisites of comprehensive characterization of porous solids. There are various categorizations of pores described in the literature, but it is difficult to give a consistent global classification of porous substances including catalysts, adsorbents, oxides, carbons, zeolites, organic polymers, soils etc. The purpose of each of these classifications is to organize pores in classes by grouping them on the basis of their common characteristics like structure, size, accessibility, shape etc. In this study, a summary of the most used classifications of porous materials is done. Some common properties or behavior for individual classifications could be found, but many differences mainly in pore size are still subject of intensive discussions. Therefore, it is the purpose of this review to provide a general description of the concept and classification of pores in porous solids, to deal with complexity of the matter and to organise our knowledge in decision-making proccesses of pore characteristics determination.

scholarly journals The Proposal and Necessity of the Numerical Description of Nano- and Microplastics’ Surfaces (Plastisphere)

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2255
Author(s):  
Agnieszka Dąbrowska ◽  
Marianna Gniadek ◽  
Piotr Machowski
Keyword(s):  
Ecological Niche ◽  
Polymer Materials ◽  
Ecological Significance ◽  
Synthetic Materials ◽  
Physical And Chemical ◽  
Comprehensive Characterization ◽  
Scanning Electron ◽  
Chemical Description

The constantly growing amount of synthetic materials < 5 mm, called microplastics (MPs), is fragmented in the environment. Thus, their surface, Plastisphere, is substantially increasing forming an entirely new ecological niche. It has already been extensively studied by microbiologists observing the biofilm and by material scientists interested in the weathering of polymer materials. This paper aims to construct a bridge between the physical and chemical description of the Plastisphere and its microbiological and ecological significance. Various algorithms, based on the analysis of pictures obtained by scanning electron microscopy (SEM), are proposed to describe in detail the morphology of naturally weathered polymers. In particular, one can study the size and distribution of fibres in a standard filter, search the synthetic debris for mapping, estimate the grain size distribution, quantitatively characterize the different patterns of degradation for polymer spheres and ghost nets, or calculate the number of pores per surface. The description and visualization of a texture, as well as the classification of different morphologies present on a surface, are indispensable for the comprehensive characterization of weathered polymers found inside animals (e.g., fishes). All these approaches are presented as case studies and discussed within this work.

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