Profiles

Pierre Munier

Pierre Munier

PhD Student

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Works at Department of Materials and Environmental Chemistry
Email pierre.munier@mmk.su.se
Visiting address Svante Arrhenius väg 16 C
Room C 424
Postal address Institutionen för material- och miljökemi 106 91 Stockholm

About me

1. About me

French PhD student in the Materials chemistry division. Master degrees in materials chemistry and chemical engineering obtained in Chimie ParisTech and Université Pierre et Marie Curie, Paris, France. Moved to Sweden and Stockholm University in 2016 to conduct a PhD under the supervision of Prof. Lennart Bergström.

 2. Research

Nanocellulose-based composites, anisotropic foams for thermal insulation, self-assembly, directional processing, rheology, thermal conductivity, mechanical properties.

 3. On-going projects

2016-2020 : MULTIMAT – A multiscale approach towards mesostructured porous material design. Subproject, Super-porous nanocomposite foams by directed assembly. Marie Sklodowska-Curie Actions Innovative Training Networks (H2020-MSCA-ITN-2014).

Publications

A selection from Stockholm University publication database
  • 2018. Konstantin Kriechbaum (et al.).

    Cellulose nanofibrils (CNFs) are a unique nanomaterial because of their abundant, renewable, and biocompatible origin. Compared with synthetic nanoparticles, CNFs are commonly produced from cellulose fibers (e.g., wood pulp) by repetitive high-shear mechanical disintegration. Yet, this process is still highly demanding in energy and costly, slowing down the large-scale production and commercialization of CNFs. Reducing the energy consumption during fibers fibrillation without using any chemical or enzymatic pretreatments while sustaining the CNF quality is challenging. Here, we show that the anisotropic properties of the CNF foams are directly connected to the degree of nanofibrillation of the cellulose fibers. CNFs were produced from wood pulps using a grinder at increasing specific energy consumptions. The anisotropic CNF foams were made by directional ice templating. The porous architecture, the compressive behavior of the foams, and the CNF alignment in the foam cell walls were correlated to the degree of fibrillation. A particular value of specific energy consumption was identified with respect to the highest obtained foam properties and CNF alignment. This value indicated that the optimal degree of fibrillation, and thus CNF quality, was achieved for the studied cellulose pulp. Our approach is a straightforward tool to evaluate the CNF quality and a promising method for the benchmarking of different CNF grades.

  • 2016. Pierre Munier (et al.). Biomacromolecules 17 (5), 1875-1881

    We show that unidirectional freezing of nanocellulose dispersions produces cellular foams with high alignment of the rod-like nanoparticles in the freezing direction. Quantification of the alignment in the long direction of the tubular pores with X-ray diffraction shows high orientation of cellulose nanofibrils (CNF) and cellulose nanocrystals (CNC) at particle concentrations above 0.2 wt % (CNC) and 0.08 wt % (CNF). Aggregation of CNF by pH decrease or addition of salt significantly reduces the particle orientation; in contrast, exceeding the concentration where particles gel by mobility constraints had a relatively small effect on the orientation. The dense nanocellulose network formed by directional freezing was sufficiently strong to resist melting. The formed hydrogels were birefringent and displayed anisotropic laser diffraction patterns, suggesting preserved nanocellulose alignment and cellular structure. Nondirectional freezing of the hydrogels followed by sublimation generates foams with a pore structure and nanocellulose alignment resembling the structure of the initial directional freezing.

Show all publications by Pierre Munier at Stockholm University

Last updated: January 20, 2020

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