Difference between revisions of "DAURE Microscopy"
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=== Soot Agglomerates === | === Soot Agglomerates === | ||
+ | {| border="0" cellpadding="3" | ||
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+ | |-style="height:140px" | ||
+ | | align="center" bgcolor="lightgrey"| [[image:FEI BCN04 18 soot.jpg|450px]] || '''Particle 12''' <br>Fresh soot agglomerate <br> Size = 290 nm <br> ''Composition:'' Major components: C, O; Minor components: S, Si, Na <br> | ||
+ | ---- | ||
+ | Notes: <br> Chain-like structure of agglomerates generally indicates the aerosol is fresh. Size of the primitive particles ranges from 40-60 nm. The agglomerate is coated with a sulfate (possible organic/sulfate mixture) layer. <br> | ||
+ | |||
+ | |-style="height:140px" | ||
+ | | align="center" bgcolor="lightgrey"| [[image:FEI BCN06 Soot 5.jpg|450px]] || '''Particle 13''' <br>Aged soot agglomerate <br> Size = 390 nm <br> ''Composition:'' Major components: C, O; Minor components: S, Si, Na <br> | ||
+ | ---- | ||
+ | Notes: <br> Sponge structure indicates aerosol aging. The coating thickness in this type of structues strongly varies with the time of the day due to the condensation of organics on the surface. <br> | ||
+ | |||
+ | |} | ||
=== Other Carbonaceous Particles === | === Other Carbonaceous Particles === |
Revision as of 10:26, 16 April 2009
This page will contain electron microscopy images acquired by Esther Coz of CIEMAT/CSIC at RJ Lee Group, Inc.
The images presented above have been acquired with two different high resolution Scanning Electron Microscopes (FEI Sirion400 and Hitachi S5500). Background has been automatically substracted from images to enhance the morphology, but no post processing has been applied on the particles after acquisition. The different relative content of each of the groups (and subgroups) presented below has been quantified and its variations at different times of the day have been analyzed together with the morphological descriptors of each group with a fully automated SEM (PSEM 500). The data is still under review/analysis. Any commentaries, suggestions or corrections (if any mistake is found) are welcome. Please, email esther.coz@ciemat.es.
Contents
Images from the BCN site
Primary Biogenic Organic Particles
Despite not being an important group in abundance, the microscopy analysis of PM2.5 samples from BCN site revealed a very rich diversity of this particle type. Several families of spores, vegetative and insect detritus and bacteria have been identified with sizes from 300 nm up to 4 µm. Some of them are frequently mixed with other anthropogenic aerosols.
Heavy Metal Oxides
Frequently found in the PM2.5 samples collected during traffic peak hours with sizes from 800 nm up to 5 µm. Some of them are frequently mixed with mineral particles. The most abundant are iron oxides (frequently linked to minor contents of titanium and zinc).
Mineral Particles
Soot Agglomerates
Other Carbonaceous Particles
Sulfates
Images from the MSY site
Upcoming...