TY - JOUR

T1 - Structural Diversity in Cryoaerogel Synthesis

AU - Müller, Dennis

AU - Klepzig, Lars F.

AU - Schlosser, Anja

AU - Dorfs, Dirk

AU - Bigall, Nadja C.

N1 - Funding Information: The project has in parts been funded by the Deutsche For-schungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project ID 390833453). The authors also would like to acknowledge the DFG (grant agreement BI 1708/4–1 & DO 1580/5–1), the European Research Council (European Un-ion’s Horizon 2020 research and innovation program, grant agreement 714429), and the German Federal Ministry of Education and Research (BMBF) within the framework of the program Nano-MatFutur (support code 03X5525) for financial support. A. S. is thankful for the financial support from the Hannover School for Nanotechnology (HSN). D.M. is thankful for the financial support from the Graduiertenakademie of the Leibniz Universität Hannover. The authors thank Armin Feldhoff and Jürgen Caro for providing the SEM facility as well as the Institute for Inorganic Chemistry for providing the ICP-OES facility.

PY - 2021/5/4

Y1 - 2021/5/4

N2 - Different techniques that enable the selective microstructure design of aerogels without the use of additives are presented. For this, aerogels were prepared from platinum nanoparticle solutions using the cryoaerogelation method, and respective impacts of different freezing times, freezing media, and freezing temperatures were investigated with electron microscopy as well as inductively coupled plasma optical emission spectroscopy. The use of lower freezing temperatures, freezing media with higher heat conductivities, and longer freezing periods led to extremely different network structures with enhanced stability. In detail, materials were created in the shape of lamellar, cellular, and dendritic networks. So far, without changing the building blocks, it was not possible to create the selective morphologies of resulting aerogels in cryoaerogelation. Now, these additive-free approaches enable targeted structuring and will open up new opportunities in the future cryoaerogel design.

AB - Different techniques that enable the selective microstructure design of aerogels without the use of additives are presented. For this, aerogels were prepared from platinum nanoparticle solutions using the cryoaerogelation method, and respective impacts of different freezing times, freezing media, and freezing temperatures were investigated with electron microscopy as well as inductively coupled plasma optical emission spectroscopy. The use of lower freezing temperatures, freezing media with higher heat conductivities, and longer freezing periods led to extremely different network structures with enhanced stability. In detail, materials were created in the shape of lamellar, cellular, and dendritic networks. So far, without changing the building blocks, it was not possible to create the selective morphologies of resulting aerogels in cryoaerogelation. Now, these additive-free approaches enable targeted structuring and will open up new opportunities in the future cryoaerogel design.

UR - http://www.scopus.com/inward/record.url?scp=85105973037&partnerID=8YFLogxK

U2 - 10.1021/acs.langmuir.0c03619

DO - 10.1021/acs.langmuir.0c03619

M3 - Article

C2 - 33884880

AN - SCOPUS:85105973037

VL - 37

SP - 5109

EP - 5117

JO - LANGMUIR

JF - LANGMUIR

SN - 0743-7463

IS - 17

ER -