Experiment: Caltech Atmospheric Chamber_20201028_DECAMETHYLCYCLOPENTASILOXANE_Hydroxyl radical_Ammonium sulfate_C4

Experiment

Name: Caltech Atmospheric Chamber_20201028_DECAMETHYLCYCLOPENTASILOXANE_Hydroxyl radical_Ammonium sulfate_C4
Date: 2020-10-28

Organization
Caltech Atmospheric Chamber

Chamber
Near Bag 2017

Experiment Set
D5 Chamber Experiments

Goals
Measure SOA yield of D5

Summary
Performed in the Caltech Near Bag, no NOx

Experiment Details

Categories:

  • Aerosol formation
Temperature: 17.7
Relative Humidity: 5
Seeded Experiment: Yes
Type of Seed: Ammonium sulfate
Initial Seed Concentration Value:
Seed Concentration Units:
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 5
Reaction type:
Oxidant Name: Hydroxyl radical
Initial Oxidant Concentration Value: 1.6e6 (molecules_per_cubic_centimeter)
RO2 Main Fate: HO2
RO2 Lifetime: (Seconds)
Pressure:

Data Sets

ID Instrument File  
3587 XMAN SMPS 201028_NB_TimeLine.csv
3588 RHT Probe 201028_NB_RHT.csv
3589 CIMS 201028_NB_CIMS.csv
3590 GC - FID 201028_NB_GC.csv
3591 NOxTele 201028_NB_NOx_O3.csv

Data Set plots
Choose a file: Choose the X-Axis:

Experiment Set Details

Name: D5 Chamber Experiments
Time format and units:
Description:
Decamethylcyclopentasiloxane (D5, C10H30O5Si5) is measured at ppt levels outdoors and ppb levels indoors. Primarily used in personal care products, its outdoor concentration is correlated to population density. Since understanding the aerosol formation potential of volatile chemical products is critical to understanding particulate matter in urban areas, the secondary organic aerosol yield of D5 was studied under a wide range of OH concentrations and exposures using both batch-mode chamber and continuously run flow tube experiments. These results were comprehensively analyzed and compared to two other secondary organic aerosol (SOA) yield datasets from literature. It was found that the SOA yield from the oxidation of D5 is extremely dependent on the OH concentration or exposure.

Collaborators:

  • Sophia M Charan Caltech

Download

Download this Experiment (297.25 KB)

Contacts

Principal investigator:

John H Seinfeld
Phone: (626) 395-4635
E-mail: seinfeld@caltech.edu
OrcID: https://orcid.org/0000-0003-1344-4068

Data Manager:

Stephanie Kong
Phone: 626-395-3194
E-mail: wkong@caltech.edu

Reactant

Reactant Compound type Concentration Concentration units
DECAMETHYLCYCLOPENTASILOXANE (10913) 580 Parts Per Billion

201028_NB_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
10/28/2020 10:26:29 RHT/NOx/O3 on
10/28/2020 10:59:55 CIMS on
10/28/2020 12:50:58 SMPS on
10/28/2020 13:07:40 GC on
10/28/2020 14:00:00 Time background starts
10/28/2020 17:00:00 Lights on
10/28/2020 23:50:01 GC off
10/28/2020 23:54:23 DMA off
10/29/2020 00:04:10 CIMS off
10/29/2020 00:14:59 RHT/Nox/O3 off

Citations
Cite this experiment: Publication associated with this experiment:

Characterizations
Light Flux Characterizations:
(None)
Particle Loss Characterizations:
(None)
Vapor Loss Characterizations:
(None)

Chamber Details

Name: Near Bag 2017
Volume in cubic meters: 19
Shape: Rectangular Prism
Surface area in cubic meters: 41.8
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 50
Replacement date: 2017-08-08
Replacement frequency: As needed
Cleaning method: Flushing with air
o3 background:
nox background: 0.1
Particle background in micrograms per cubic meter: 0
Air filtration method: Custom Filter
Mixing method: 0
Mixing method material:
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius): 20
Temparature range (max degrees celcius): 45
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 5
Relative humidity range (max percent): 100
Particle experiment capability: 1
Lights: Yes
Light source type(s): UVA Black Lamps
Supplemental information: https://www.worldscientific.com/doi/abs/10.1142/9789813147355_0001
Additional Notes: