Behaviour of ZnO nanoparticles during high temperature

Behaviour of ZnO nanoparticles during high temperature treatment: on-line, size-resolved elemental analysis

Contact: Debora Foppiano - debora.foppiano@psi.chth20 ETH Conference on Combustion Generated Nanoparticles

th thJune 13 - June 16 , 2016, ETH Zürich, Switzerland

Ÿ RDD: adjustable and high dilution ratio and well-defined flows of the aerosol

Ÿ SMPS: online analysis of size distribution and concentration of particles

Ÿ ICP-MS: online elemental analysis (chemical composition)

Ÿ Thermal treatment of ZnO nanopowder in a tubular furnace

General Energy Research Department

Paul Scherrer Institut5232 Villigen PSI, Switzerland

Bioenergy and Catalysis Laboratory - Chemical Processes and Materials

a,b a a a a,bD. Foppiano , M. Tarik , A. Hess , E. Müller , C. Ludwiga Paul Scherrer Institut (PSI), Switzerland

b École Polytechnique Fédérale de Lausanne (EPFL), Switzerland

Measuring Arrangement : RDD-SMPS-ICP-MS

Experimental Data

DMA

CPC

RDDcpl

Qpoly

QC

PC

ICP-MS

Qmono,tot Qmono,CPC

Qm

on

o,IC

P

Air

to Vent

to Vent

Ar

Qraw,out

Qd

il A

r

Qair,CPC

QE

xcess

QS

he

ath

Excess air,CPC

Sheath

dil Ar

mass flow controller

aerosol neutralizer

particle filter

pump

XYZ

Qraw,inAr + H2

FURNACE

Conclusion

MotivationŸ Fate of metal nanoparticles in incinerator plants: heavy metals may volatilize and re-form as incidental

nanoparticles after filtration of the flue gas

Ÿ ZnO nanoparticles used in paints and waterproofing agents (used as wood preservatives)Ÿ

Ÿ Detection of Zn containing nanoparticles during high temperature treatment in reducing atmospheres

Ÿ Preliminary results for wood combustion: reducing conditions can influence the release of nanoparticles containing redox-sensitive elements, such as Zn

200 nm

ZnO

KeV

Zn

KeV

SMPS-ICP-MS SEM and XRD analysis on ZnO powder

SEM and EDX analysis (after thermal treatment)

Hexagonal crystalline structure

200 nm

Nearly spherical morphology

Analysis on remaining powder, after thermal treatment

Flower-liketype morphology

Lamellartype morphology

ZnO nanoparticles detection with SMPS-ICP-MS in the range of 50 - 290 nm

Acknowledgements Financial support was obtained from the Competence Center for Materials Science and Technology (CCMX, Project NanoAir) , the Swiss National Science Foundation (Projects 139136 and 136890), the Swiss Nanoscience Institute (Argovia, Project NanoFil), and the Swiss Competence Center for Energy Research – Biomass for Swiss Energy Future (SCCER BIOSWEET) in cooperation with the Commission for Technology and Innovation CTI.