{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T21:58:05Z","timestamp":1789682285592,"version":"4.0.1"},"reference-count":46,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2025,4,11]],"date-time":"2025-04-11T00:00:00Z","timestamp":1744329600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Republic of Serbia Ministry of Science, Technology and Innovation","award":["451-03-436\/2025-03\/200051"],"award-info":[{"award-number":["451-03-436\/2025-03\/200051"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Foam-formed cellulose biocomposites provide a promising, innovative approach to creating lightweight and eco-friendly materials for utilization in packaging and insulation. This study investigates the production and characterization of temperature-resistant, mechanically stable cellulose fiber (CF) composite foams reinforced with alumina nanofibers (ANFs). To evaluate the impact of ANFs on rheology and drainage, CF suspensions were prepared at a concentration of 20 g\/kg, with ANFs added at 2 wt% and 5 wt%. All foams exhibited shear-thinning behavior, with variations in flow characteristics influenced by ANF consistency and particle\u2013bubble interactions. ANFs were integrated into the dry CF foam structure using two methods: (i) immersion in an ANF water suspension, and (ii) direct injection of the suspension into the foam matrix. Mechanical and thermal analyses of the dried CF foams with 2% ANFs demonstrated significant improvements in strength and thermal stability. Incorporating ANFs into CF-based foams enhances their rheological properties, improves mechanical and thermal performance, and reduces combustion rates. These results highlight the potential of ANF-reinforced CF foams for use in industries requiring biodegradable insulation and packaging materials.<\/jats:p>","DOI":"10.3390\/polym17081043","type":"journal-article","created":{"date-parts":[[2025,4,14]],"date-time":"2025-04-14T03:39:16Z","timestamp":1744601956000},"page":"1043","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Improving Mechanical and Thermal Properties of Cellulose Foam with Alumina Nanofibers"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-2030-2696","authenticated-orcid":false,"given":"Sirje","family":"Liukko","sequence":"first","affiliation":[{"name":"Department of Chemical and Metallurgical Engineering, School of Chemical Engineering, Aalto University, 02150 Espoo, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6397-7711","authenticated-orcid":false,"given":"Katarina","family":"Dimic-Misic","sequence":"additional","affiliation":[{"name":"Department of Chemical and Metallurgical Engineering, School of Chemical Engineering, Aalto University, 02150 Espoo, Finland"},{"name":"Institute of General and Physical Chemistry, 11000 Belgrade, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aleksandar","family":"Janackovic","sequence":"additional","affiliation":[{"name":"Institute of General and Physical Chemistry, 11000 Belgrade, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5782-7987","authenticated-orcid":false,"given":"Michael","family":"Gasik","sequence":"additional","affiliation":[{"name":"Department of Chemical and Metallurgical Engineering, School of Chemical Engineering, Aalto University, 02150 Espoo, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,4,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"3358","DOI":"10.1002\/anie.200460587","article-title":"Cellulose: Fascinating biopolymer and sustainable raw material","volume":"44","author":"Klemm","year":"2005","journal-title":"Angew. Chem. Int. Ed."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Jiang, Z., and Ngai, T. (2022). Recent advances in chemically modified cellulose and its derivatives for food packaging applications: A review. Polymers, 14.","DOI":"10.3390\/polym14081533"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"3542","DOI":"10.1039\/D1GC00326G","article-title":"Fundamentals of cellulose lightweight materials: Bio-based assemblies with tailored properties","volume":"23","author":"Ferreira","year":"2021","journal-title":"Green Chem."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"118750","DOI":"10.1016\/j.indcrop.2024.118750","article-title":"Hydrophobic bio-based foam with improved mechanical strength and antibacterial activity via rosin coating","volume":"216","author":"Liu","year":"2024","journal-title":"Ind. Crops Prod."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Obradovic, J., Voutilainen, M., Virtanen, P., Lassila, L., and Fardim, P. (2017). Cellulose fibre-reinforced biofoam for structural applications. Materials, 10.","DOI":"10.3390\/ma10060619"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"107788","DOI":"10.1016\/j.jece.2022.107788","article-title":"A lightweight, biodegradable, and recyclable cellulose-based bio-foam with good mechanical strength and water stability","volume":"10","author":"Liao","year":"2022","journal-title":"J. Environ. Chem. Eng."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"101845","DOI":"10.1016\/j.cocis.2024.101845","article-title":"Liquid foam: Fundamentals, rheology, and applications of foam displacement in porous structures","volume":"74","author":"Moradpour","year":"2024","journal-title":"Curr. Opin. Colloid Interface Sci."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"20","DOI":"10.1016\/j.cis.2007.04.001","article-title":"Structure and dynamics of confined foams: A review of recent progress","volume":"137","author":"Weaire","year":"2008","journal-title":"Adv. Colloid Interface Sci."},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Dyga, R., and P\u0142aczek, M. (2020). Influence of Hydrodynamic Conditions on the Type and Area of Occurrence of Gas\u2013Liquid Flow Patterns in the Flow through Open\u2013Cell Foams. Materials, 13.","DOI":"10.3390\/ma13153254"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Su, Y., Wei, Y., He, Y., and Chen, G. (2024). Cellulose fiber-based and engineered capillary foam toward a sustainable, recyclable, and high-performance cushioning structural material. Int. J. Biol. Macromol., 267.","DOI":"10.1016\/j.ijbiomac.2024.131422"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1016\/0001-8686(92)80071-5","article-title":"Wet foams: Formation, properties and mechanism of stability","volume":"40","year":"1992","journal-title":"Adv. Colloid Interface Sci."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"227","DOI":"10.1016\/j.foodhyd.2009.09.011","article-title":"Effects of sucrose on egg white protein and whey protein isolate foams: Factors determining properties of wet and dry foams (cakes)","volume":"24","author":"Yang","year":"2010","journal-title":"Food Hydrocoll."},{"key":"ref_13","unstructured":"Punton, V. The Use of an Aqueous Foam as a Fiber Suspending Medium in Quality Papermaking. Proceedings of a Symposium Organized by the Society of the Chemical Industry, Colloid and Surface Chemistry Group, Uxbridge, UK, 8\u201310 September 1975, Academic Press."},{"key":"ref_14","unstructured":"Punton, V. (1975, January 6\u20138). Fiber Distribution in Foam and Foam-Laid Paper. Proceedings of the International Paper Physics Conference, Indianapolis, IN, USA."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Nechita, P., and N\u0103stac, S.M. (2022). Overview on foam forming cellulose materials for cushioning packaging applications. Polymers, 14.","DOI":"10.3390\/polym14101963"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"392","DOI":"10.3183\/npprj-2013-28-03-p392-398","article-title":"Potential of foam-laid forming technology in paper applications","volume":"28","author":"Lehmonen","year":"2013","journal-title":"Nord. Pulp Pap. Res. J."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Siljander, S., Kein\u00e4nen, P., Ivanova, A., Lehmonen, J., Tuukkanen, S., Kanerva, M., and Bj\u00f6rkqvist, T. (2019). Conductive cellulose-based foam formed 3D shapes\u2014From innovation to designed prototype. Materials, 12.","DOI":"10.3390\/ma12030430"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"2529","DOI":"10.1007\/s10570-018-2205-5","article-title":"Properties of lightweight fibrous structures made by a novel foam forming technique","volume":"26","author":"Burke","year":"2019","journal-title":"Cellulose"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"226","DOI":"10.3183\/npprj-2012-27-02-p226-230","article-title":"Exceptional pore size distribution in foam-formed fibre networks","volume":"27","author":"Hjelt","year":"2012","journal-title":"Nord. Pulp Pap. Res. J."},{"key":"ref_20","first-page":"87","article-title":"An experimental study on thermal conductivity of building insulation materials","volume":"23","author":"Hong","year":"1985","journal-title":"J. Archit. Inst. Korea"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"192","DOI":"10.1007\/s42452-021-04172-9","article-title":"Analysis of the foam-forming of non-woven lightweight fibrous materials using X-ray tomography","volume":"3","author":"Burke","year":"2021","journal-title":"SN Appl. Sci."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"679","DOI":"10.3183\/npprj-2014-29-04-p679-689","article-title":"Foam forming revisited Part I. Foaming behaviour of fibre-surfactant systems","volume":"29","author":"Mira","year":"2014","journal-title":"Nord. Pulp Pap. Res. J."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"226","DOI":"10.1515\/npprj-2018-3031","article-title":"Density development in foam forming: Wet pressing dynamics","volume":"33","author":"Pihko","year":"2018","journal-title":"Nord. Pulp Pap. Res. J."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Masuelli, M.A. (2013). Introduction of fibre-reinforced polymers\u2212polymers and composites: Concepts, properties and processes. Fiber Reinforced Polymers\u2014The Technology Applied for Concrete Repair, IntechOpen.","DOI":"10.5772\/3162"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"2599","DOI":"10.1007\/s10570-018-1738-y","article-title":"Water-stable cellulose fiber foam with antimicrobial properties for bio based low-density materials","volume":"25","author":"Ottenhall","year":"2018","journal-title":"Cellulose"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1824","DOI":"10.1039\/b927505c","article-title":"Mechanical performance tailoring of tough ultra-high porosity foams prepared from cellulose I nanofibre suspensions","volume":"6","author":"Sehaqui","year":"2010","journal-title":"Soft Matter"},{"key":"ref_27","first-page":"1735","article-title":"Superhydrophobic foam-like cellulose made of hydrophobized cellulose fibres","volume":"21","author":"Tejado","year":"2014","journal-title":"Cellulose"},{"key":"ref_28","unstructured":"Al-Qararah, A.M. (2015). Aqueous Foam as the Carrier Phase in the Deposition of Fibre Networks. [Ph.D. Thesis, University of Jyv\u00e4skyl\u00e4]."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1127","DOI":"10.1007\/s10570-019-02842-x","article-title":"Dewatering of foam-laid and water-laid structures and the formed web properties","volume":"27","author":"Lehmonen","year":"2020","journal-title":"Cellulose"},{"key":"ref_30","first-page":"315","article-title":"A review of foam drainage","volume":"102","author":"Weaire","year":"1997","journal-title":"Adv. Chem. Phys."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"110","DOI":"10.1016\/j.colsurfa.2005.08.040","article-title":"The growth, drainage and bursting of foams","volume":"274","author":"Grassia","year":"2006","journal-title":"Colloids Surf. A Physicochem. Eng. Asp."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"184","DOI":"10.1016\/j.colsurfa.2004.12.014","article-title":"The growth, drainage and breakdown of foams","volume":"263","author":"Neethling","year":"2005","journal-title":"Colloids Surf. A Physicochem. Eng. Asp."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1016\/j.cocis.2007.11.004","article-title":"The rheology of foam","volume":"13","author":"Weaire","year":"2008","journal-title":"Curr. Opin. Colloid Interface Sci."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"175","DOI":"10.1122\/1.549940","article-title":"Foam rheology: A model of viscous phenomena","volume":"31","author":"Kraynik","year":"1987","journal-title":"J. Rheol."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"412","DOI":"10.1016\/j.compscitech.2018.10.023","article-title":"Effect of surface modification on the dispersion, rheological behavior, crystallization kinetics, and foaming ability of polypropylene\/cellulose nanofiber nanocomposites","volume":"168","author":"Wang","year":"2018","journal-title":"Compos. Sci. Technol."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"376","DOI":"10.1016\/j.matdes.2016.04.088","article-title":"Cellulose nanofibril foams: Links between ice-templating conditions, microstructures and mechanical properties","volume":"104","author":"Cochereau","year":"2016","journal-title":"Mater. Des."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"4058","DOI":"10.15376\/biores.13.2.4058-4074","article-title":"Improving compression recovery of foam-formed fiber materials","volume":"13","author":"Paunonen","year":"2018","journal-title":"BioResources"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"6961","DOI":"10.1007\/s10570-020-03263-x","article-title":"On the strength improvement of lightweight fibre networks by polymers, fibrils and fines","volume":"27","author":"Ketoja","year":"2020","journal-title":"Cellulose"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"1125","DOI":"10.1038\/s41467-023-36763-y","article-title":"Viscoelastic coarsening of quasi-2D foam","volume":"14","author":"Guidolin","year":"2023","journal-title":"Nat. Commun."},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Reichler, M., Rabensteiner, S., T\u00f6rnblom, L., Coffeng, S., Viitanen, L., Jannuzzi, L., M\u00e4kinen, T., Mac Intyre, J.R., Koivisto, J., and Puisto, A. (2021). Scalable method for bio-based solid foams that mimic wood. Sci. Rep., 11.","DOI":"10.1038\/s41598-021-03764-0"},{"key":"ref_41","unstructured":"Kutuzov, M. (2013). Method and System for Alumina Nanofibers Synthesis from Molten Aluminum. (Application No. 13\/756,366), U.S. Patent."},{"key":"ref_42","unstructured":"Hussainova, I., and Gasik, M. (2016). A Substrate and a Method for Purification and Analysis of Fluids. ( PCT WO2016016872, EP3174632), Patent Application."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"4017","DOI":"10.1016\/j.jeurceramsoc.2015.06.011","article-title":"Gra-phene-encapsulated aluminium oxide nanofibers as a novel type of nanofillers for electroconductive ceramics","volume":"35","author":"Ivanov","year":"2015","journal-title":"J. Eur. Ceram. Soc."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"43","DOI":"10.1016\/j.tca.2015.01.009","article-title":"Thermal and microstructural analysis of doped alumina nanofibers","volume":"602","author":"Aghayan","year":"2015","journal-title":"Thermochim. Acta"},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"12603","DOI":"10.1016\/j.ceramint.2014.04.087","article-title":"Functionalization of gamma-alumina nanofibers by alpha-alumina via solution combustion synthesis","volume":"40","author":"Aghayan","year":"2014","journal-title":"Ceram. Int."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"1462","DOI":"10.1080\/01932691.2020.1869035","article-title":"Foam forming of fiber products: A review","volume":"43","author":"Hjelt","year":"2022","journal-title":"J. Dispers. Sci. Technol."}],"container-title":["Polymers"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2073-4360\/17\/8\/1043\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T17:13:06Z","timestamp":1760029986000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2073-4360\/17\/8\/1043"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,4,11]]},"references-count":46,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2025,4]]}},"alternative-id":["polym17081043"],"URL":"https:\/\/doi.org\/10.3390\/polym17081043","relation":{},"ISSN":["2073-4360"],"issn-type":[{"value":"2073-4360","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,4,11]]}}}