TY - JOUR

T1 - Spray-Drying and Atomic Layer Deposition

T2 - Complementary Tools toward Fully Orthogonal Control of Bulk Composition and Surface Identity of Multifunctional Supraparticles

AU - Müssig, Stephan

AU - Koch, Vanessa M.

AU - Collados Cuadrado, Carlos

AU - Bachmann, Julien

AU - Thommes, Matthias

AU - Barr, Maïssa K.S.

AU - Mandel, Karl

N1 - Publisher Copyright: © 2021 The Authors. Small Methods published by Wiley-VCH GmbH

PY - 2022/1/20

Y1 - 2022/1/20

N2 - Spray-drying is a scalable process enabling one to assemble freely chosen nanoparticles into supraparticles. Atomic layer deposition (ALD) allows for controlled thin film deposition of a vast variety of materials including exotic ones that can hardly be synthesized by wet chemical methods. The properties of coated supraparticles are defined not only by the nanoparticle material chosen and the nanostructure adjusted during spray-drying but also by surface functionalities modified by ALD, if ALD is capable of modifying not only the outer surfaces but also surfaces buried inside the porous supraparticle. Simultaneously, surface accessibility in the porous supraparticles must be ensured to make use of all functionalized surfaces. In this work, iron oxide supraparticles are utilized as a model substrate as their magnetic properties enable the use of advanced magnetic characterization methods. Detailed information about the structural evolution upon individual ALD cycles of aluminium oxide, zinc oxide and titanium dioxide are thereby revealed and confirmed by gas sorption analyses. This demonstrates a powerful and versatile approach to freely designing the functionality of future materials by combination of spray-drying and ALD.

AB - Spray-drying is a scalable process enabling one to assemble freely chosen nanoparticles into supraparticles. Atomic layer deposition (ALD) allows for controlled thin film deposition of a vast variety of materials including exotic ones that can hardly be synthesized by wet chemical methods. The properties of coated supraparticles are defined not only by the nanoparticle material chosen and the nanostructure adjusted during spray-drying but also by surface functionalities modified by ALD, if ALD is capable of modifying not only the outer surfaces but also surfaces buried inside the porous supraparticle. Simultaneously, surface accessibility in the porous supraparticles must be ensured to make use of all functionalized surfaces. In this work, iron oxide supraparticles are utilized as a model substrate as their magnetic properties enable the use of advanced magnetic characterization methods. Detailed information about the structural evolution upon individual ALD cycles of aluminium oxide, zinc oxide and titanium dioxide are thereby revealed and confirmed by gas sorption analyses. This demonstrates a powerful and versatile approach to freely designing the functionality of future materials by combination of spray-drying and ALD.

KW - atomic layer deposition

KW - spray-drying

KW - supraparticles

KW - MAGNETIC-PROPERTIES

KW - PARTICLES

KW - NANOPARTICLES

KW - FUNCTIONALIZATION

KW - CLUSTERS

KW - NITROGEN

UR - http://www.scopus.com/inward/record.url?scp=85119477202&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/f7814ae7-10e5-3e7d-9271-7a0dae6f7ea9/

U2 - 10.1002/smtd.202101296

DO - 10.1002/smtd.202101296

M3 - Article

AN - SCOPUS:85119477202

VL - 6

JO - Small Methods

JF - Small Methods

SN - 2366-9608

IS - 1

M1 - 2101296

ER -