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1
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52649103246
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The flow-through aerosol differential mobility analyzer(DMA) 2.3 determines the mobility of transmitted particles by their migration across a laminar flow under the influence of an electric field controlled by an applied potential. The DMA used here was designed by Eichler.4.5 The parameters which determine the transmitted mobility are the sheath flow 292 L/min, the applied potential, and the geometric dimensions of the DMA. The DMA outlet contains a precipitator whose collector is connected to an electrometer to measure the current of charged particles transmitted through the outlet slit. The applied potential was controlled by an MS-DOS program which recorded the potential and the electrometer current in a file for subsequent processing. The potential values were calibrated using a traceable high-voltage divider and a digital voltmeter, and the calibration was used to correct the recorded values. To calculate the mobility at each potential, we used the formula
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2 The pressure in the analyzer was 0.95 atm at the flow rates used, and the mobility was assumed to be inversely proportional to pressure to obtain the mobility values at standard conditions.
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4
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52649179121
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T. Eichler, Senior Graduation Thesis, Fachhochschule Offenburg (1997); J. Fernandez de la Mora, L. de Juan, and T. Eichler, J. Rosell, U.S. Patent 5,869,831 (1999).
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T. Eichler, Senior Graduation Thesis, Fachhochschule Offenburg (1997); J. Fernandez de la Mora, L. de Juan, and T. Eichler, J. Rosell, U.S. Patent 5,869,831 (1999).
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52649120013
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14 A solution of 1.6 mg/mL of reagent-grade sucrose in 20 mM ammonium acetate was diluted as required into 20 mM ammonium acetate, with pH adjusted as desired by adding either concentrated ammonia or glacial acetic acid. The liquid conductivity was 0.2 S/m for all pH values used. All solutions were kept refrigerated before use.
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14 A solution of 1.6 mg/mL of reagent-grade sucrose in 20 mM ammonium acetate was diluted as required into 20 mM ammonium acetate, with pH adjusted as desired by adding either concentrated ammonia or glacial acetic acid. The liquid conductivity was 0.2 S/m for all pH values used. All solutions were kept refrigerated before use.
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