Experiment: Caltech Atmospheric Chamber_20210203_DECAMETHYLCYCLOPENTASILOXANE_Hydroxyl radical_No Seed_F9toF15

Experiment

Name: Caltech Atmospheric Chamber_20210203_DECAMETHYLCYCLOPENTASILOXANE_Hydroxyl radical_No Seed_F9toF15
Date: 2021-02-03

Organization
Caltech Atmospheric Chamber

Chamber
CPOT

Experiment Set
D5 CPOT Experiments

Goals
Measure SOA yield of D5

Summary
This is the set of experiments performed with D5 where the RH was adjusted so that O3 made variable OH concentrations. This is half of the set (see 210301 for more). These are F9 through F15.

Experiment Details

Categories:

  • Aerosol formation
Temperature: 23.0
Relative Humidity: 00
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 00
Reaction type:
Oxidant Name: Hydroxyl radical
Initial Oxidant Concentration Value: variable (e7 to e9) (molecules_per_cubic_centimeter)
RO2 Main Fate: HO2
RO2 Lifetime: (Seconds)
Pressure:

Data Sets

ID Instrument File  
3612 XMAN SMPS 210203_NB_SMPS_Complete.csv
3613 RHT Probe 210203_NB_RH_REAL.csv
3614 GC - FID 210203_NB_GC.csv
3615 NOxTele 210203_NB_NOx_O3.csv

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

Experiment Set Details

Name: D5 CPOT 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
  • Yuanlong Huang Caltech

Download

Download this Experiment (3.05 MB)

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)

210203_NB_TimeLine_FLOWSonoff.csv Timeline

Time (America/Los_Angeles) Action
2/3/21 21:13 Flow of 0 ccm, background, flow on
2/4/21 10:40 Flow of 0 ccm, background, flow off
2/6/21 1:55 Flow of 0 ccm, background, flow on
2/6/21 11:00 Flow of 0 ccm, background, flow off
2/5/21 0:30 Flow of 0 ccm, flow on
2/5/21 6:40 Flow of 0 ccm, flow off
2/4/21 11:00 Flow of 120 ccm, flow on
2/4/21 15:15 Flow of 120 ccm, flow off
2/4/21 17:21 Flow of 178 ccm, flow on
2/4/21 21:36 Flow of 178 ccm, flow off
2/5/21 8:44 Flow of 207 ccm, flow on
2/5/21 13:07 Flow of 207 ccm, flow off
2/5/21 21:45 Flow of 890 ccm, flow on
2/6/21 1:50 Flow of 890 ccm, flow off
2/5/21 17:51 Flow of 1805 ccm, flow on
2/5/21 21:10 Flow of 1805 ccm, flow off
2/5/21 13:07 Flow of 5690 ccm, flow on
2/5/21 16:07 Flow of 5690 ccm, flow 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: CPOT
Volume in cubic meters: 0.043
Shape: Cylindrical
Surface area in cubic meters: 1.18
Flow Mode: Flow-through
Flow through rate in liters per minute: 2
Body Material: Glass/Quartz
Body thickness:
Replacement date:
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on Flushing with N2 Cleaning with solvent
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: Axial dispersion
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://doi.org/10.5194/amt-10-839-2017
Additional Notes: