Projects per year
Abstract
Pickering particles play an essential role in stabilizing Pickering foams that can be utilized as templates for making lightweight porous materials for thermal insulation purposes. With the shift from petroleum to renewable-source-derived materials, particles synthesized from biomass are emerging but are typically too hydrophilic to function as Pickering particles in foams. Here, we report the hydrophobization of lignin nanoparticles (LNPs) by adsorption of an oppositely charged surfactant for air-in-water Pickering foam stabilization. The surface tension and complex viscoelasticity of the aqueous dispersions were tunable by varying the concentration of LNPs and the adsorption ratio of hexadecyltrimethylammonium bromide (CTAB) onto LNPs, which were systematically studied with the pendant drop technique (DPT). Under the optimum conditions, the achieved air-in-water Pickering foams were remarkably stable against coalescence and coarsening, i.e., the bubble size distribution remained unchanged over 30 days. We further utilized the Pickering foams as templates for making dry lightweight composite foams with the introduction of cellulose nanofibrils (CNFs). The closed-cell composite foams, with lignin as the major component, exhibited good thermal insulation properties and mechanical properties that were comparable to commercial rigid polyurethane (PU) foams. We envision that the renewable Pickering particles could find applications in many other areas beyond the templates for porous materials such as enhanced oil recovery.
Original language | English |
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Pages (from-to) | 5802-5812 |
Number of pages | 11 |
Journal | Materials Advances |
Volume | 5 |
Issue number | 14 |
Early online date | 10 Jun 2024 |
DOIs | |
Publication status | Published - 21 Jul 2024 |
MoE publication type | A1 Journal article-refereed |
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Dive into the research topics of 'Hydrophobized lignin nanoparticle-stabilized Pickering foams : building blocks for sustainable lightweight porous materials'. Together they form a unique fingerprint.-
FinnCERES: Competence Center for the Materials Bioeconomy: A Flagship for our Sustainable Future
Hämäläinen, J. (Principal investigator)
01/05/2022 → 30/06/2026
Project: Academy of Finland: Other research funding
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Smart assembly of wood polymers for multifunctional advanced materials
Kimiaei, E. (Project Member) & Österberg, M. (Principal investigator)
01/01/2021 → 31/12/2023
Project: Domestic funds and foundations
Equipment
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Bioeconomy Research Infrastructure
Seppälä, J. (Manager)
School of Chemical EngineeringFacility/equipment: Facility
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OtaNano - Nanomicroscopy Center
Seitsonen, J. (Manager) & Rissanen, A. (Other)
OtaNanoFacility/equipment: Facility