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CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm...

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Effects of volatile material D 0 = 40 nm (Oven = 120 o C) Growth factor measured by HTDMA Growth factor measured by VHTDMA (after aerosol passed through oven) Shrink factor of aerosol after passing through oven (no humidification) Large red circle indicates regions where there are differences between the GF AVG measured by the HTDMA and VHTDMA
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CHARMEX VHTMA quick look Operational from : 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems •Charging in DMA at larger sizes and highest humidities. •Material used in oven needs to be changed
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Page 1: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

CHARMEX VHTMA quick look

Operational from: 5th July to 12th of JulySelected sizes: 40 nm, 80 nmOven temperature: 120oC

Problems•Charging in DMA at larger sizes and highest humidities.•Material used in oven needs to be changed •(strong odeur + temperature limit = 200oC).

Page 2: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

• GF40– Slight diurnal variation– Little spread in GFAVG values.

– GFAVG ranged from 1.4 to 1.6

• GF80– More spread in data– Less diurnal variation– GFAVG ranged from 1.6 to 2.0

CHARMEX VHTMA quick look

Page 3: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

Effects of volatile material D0 = 40 nm (Oven = 120 oC)

Growth factor measured by HTDMAGrowth factor measured by VHTDMA (after aerosol passed through oven)Shrink factor of aerosol after passing through oven (no humidification)

Large red circle indicates regions where there are differences between the GFAVG measured by the HTDMA and VHTDMA

Page 4: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

Effects of volatile material D0 = 80 nm (Oven = 120 oC)

Growth factor measured by HTDMAGrowth factor measured by VHTDMA (after aerosol passed through oven)Shrink factor of aerosol after passing through oven (no humidification)

Large red circle indicates regions where there are differences between the GFAVG measured by the HTDMA and VHTDMA

Page 5: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

Effects of volatile material D0 = 40 nm (Oven = 120 oC)

Growth factor measured by HTDMAGrowth factor measured by VHTDMA (after aerosol passed through oven)Shrink factor of aerosol after passing through oven (no humidification)

Large red circle indicates regions where there are differences between the GFAVG measured by the HTDMA and VHTDMA

Page 6: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

Effects of volatile material D0 = 80 nm (Oven = 120 oC)

Growth factor measured by HTDMAGrowth factor measured by VHTDMA (after aerosol passed through oven)Shrink factor of aerosol after passing through oven (no humidification)

Large red circle indicates regions where there are differences between the GFAVG measured by the HTDMA and VHTDMA

Page 7: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

HTDMA RH=90%HTDMA > VHTDMA

VHTDMA > HTDMA

Individual GF spectrums as a function of time (corrected for DMA transfer function)

Page 8: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

VHTDMA RH = 90%HTDMA > VHTDMA

VHTDMA > HTDMA

Individual GF spectrums as a function of time (corrected for DMA transfer function)

Page 9: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

HTDMA>VHTDMA Juillet 6, 0934

SF = 0.9Very little volume is volatilisedBig difference in GF-scan time = 30 minutes

80 nm

40 nm

Selected periods

Page 10: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

80 nm

40 nm

SF = 0.9Very low volatile and hygroscopicMaterial-scan time = 30 minutes

HTDMA>VHTDMA Juillet 6, 1034

Selected periods

Page 11: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

VHTDMA>HTDMA Juillet 10, 2334

80 nm

40 nm

SF = 0.8 to 0.9more volume is volatilised

->More volatile ->More hydrophobic coating

Semi-volaile organic coating?

Selected periods

Page 12: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

New hygroscopic modes after volatilisation??

HTDMA

VHTDMA

Page 13: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

Next steps…

• Examine data on 9th where more hygroscopic modes appear after the aerosol is volatilised.

• Comparison with meteo data• Comparison with PILS (cutoff 200 nm)

Page 14: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

DM

A1(D

ry)

DM

A2(W

et)

Hum

idifi

er

Dri

er

CPCAerosol Inlet

Ove

n

Direction of flow

Switching valve

Page 15: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.
Page 16: CHARMEX VHTMA quick look Operational from: 5th July to 12th of July Selected sizes: 40 nm, 80 nm Oven temperature: 120 o C Problems Charging in DMA at.

80 100 120 140 160 180 200

DMA1

# of

par

ticle

sDiameter (nm)

DMA2 after oven+humidityDMA2 after humidity


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