Article
Engineering, Multidisciplinary
Sungjun Hwang, Yousoo Han, Douglas J. Gardner
Summary: Bleached Kraft pulp, unbleached Kraft pulp, and old corrugated cardboard pulp are suitable for producing cellulose nanofibril suspensions. Spray drying is a fast, simple, cost-effective, and scalable drying method. Spray-dried cellulose nanofibrils can be used as reinforcing materials in polypropylene matrices. The particle size of cellulose nanofibrils affects the material properties.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Shanshan Zhang, Shi-Neng Li, Qiang Wu, Qian Li, Jingda Huang, Wenzhu Li, Wenbiao Zhang, Siqun Wang
Summary: This study successfully prepared bamboo-based phosphorylated cellulose nanofibril films with excellent mechanical performance and remarkable flame resistance, showing promising potential for applications in flame-retardant packaging materials.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Chemistry, Applied
Fugang Hu, Jinsong Zeng, Zheng Cheng, Xiaojun Wang, Bin Wang, Zhanting Zeng, Kefu Chen
Summary: The morphology and length of cellulose nanofibers (CNFs) have a significant impact on their reinforcement effect in recycled paper, with higher aspect ratios leading to better reinforcement. CNFs produced by microfluidic homogenization and suitable PFI milling conditions showed the best reinforced effect, improving tensile index and burst index significantly. This study aimed to investigate the influence of CNFs on reinforcing recycled fibers.
CARBOHYDRATE POLYMERS
(2021)
Article
Biochemistry & Molecular Biology
Mengchen Zhao, Shuji Fujisawa, Tsuguyuki Saito
Summary: We report the basic sheet properties of divalent phosphorylated cellulose nanofibers (CNFs) with different phosphorus contents and counterion types. The counterion exchange from sodium ions to calcium or aluminum ions greatly enhances all examined sheet properties of CNF sheets. The phosphorus content only has significant influences on conditioned tensile and fire-retardant properties. Compared to CNF sheets with monovalent carboxy groups, CNF sheets with divalent phosphate groups are superior in terms of wet tensile properties and fire-retardant properties.
Review
Materials Science, Paper & Wood
Thabisile Brightwell Jele, Prabashni Lekha, Bruce Sithole
Summary: Cellulose nanofibrils (CNFs) are an excellent alternative to synthetic additives in the pursuit for sustainability in the papermaking industry, as they can significantly improve the mechanical, functional, and barrier properties of different types of paper. The physical properties of CNFs, such as nanosize diameter, micrometre length, and semicrystalline structure, directly influence the mechanical properties of paper. This review discusses the role played by CNFs as additives in improving strength properties of paper and the factors affecting the improvement in paper quality.
Article
Chemistry, Applied
Amaka J. Onyianta, Guofan Xu, Anita Etale, Jean-Charles Eloi, Stephen J. Eichhorn
Summary: To overcome the challenges associated with drying and redispersion of cellulose nanofibrils (CNFs), we successfully prepared dried and redispersible CNF powders without the use of additives or conventional drying technologies. The surface properties, morphology, and thermal stabilities were maintained for different surface functionalities, and the rheological properties of the CNFs remained unaffected after drying and redispersion.
CARBOHYDRATE POLYMERS
(2023)
Article
Engineering, Chemical
Rachel Passos de Oliveira Santos, Junli Hao, Murilo Daniel de Mello Innocentini, Elisabete Frollini, Holmer Savastano Junior, Gregory C. Rutledge
Summary: Electrospun membranes comprising PAN and 0.2 to 0.6 wt% CNF were prepared and characterized for use in FFRs and medical masks. The addition of CNF led to membranes with significantly improved mechanical properties and filtration efficiency. The presence of CNF also affected the pressure drop, quality factor, and air permeability of the composite materials.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Polymer Science
Sungjun Hwang, Colleen C. Walker, Donna Johnson, Yousoo Han, Douglas J. Gardner
Summary: Enzyme-treated cellulose nanofibrils (CNFs) were prepared and spray-dried to investigate their effect on the mechanical properties of composites. The results showed that adding enzyme-treated SDCNFs enhanced the strength of PP and maintained the strength properties.
Article
Materials Science, Paper & Wood
Tianzhong Yuan, Jinsong Zeng, Bin Wang, Zheng Cheng, Wenhua Gao, Jun Xu, Kefu Chen
Summary: Incorporating cellulose nanofibrils-stabilized silver nanoparticles (CNF-AgNPs) into a starch matrix significantly improves the mechanical and antibacterial properties of hybrid films. The nanocomposite films show enhanced mechanical performance with increased tensile strength and Young's modulus. Additionally, the CNF-AgNPs/starch nanocomposite films exhibit strong bactericidal effects and good biocompatibility, making them a suitable sustainable material for food packaging.
Article
Nanoscience & Nanotechnology
Dingfeng Xu, Shennan Wang, Lars A. Berglund, Qi Zhou
Summary: The study investigates the impact of ionic interactions between differently charged nanofibers and montmorillonite nanoplatelets on the performance of nanocomposite materials. Results show that nanocomposites with different structures exhibit variations in mechanical properties and flame retardant performance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Biochemistry & Molecular Biology
Darrel Sarvesh Naidu, Maya Jacob John
Summary: In this study, cellulose nanofibrils (CNFs) were incorporated into xylan-alginate films to enhance mechanical and barrier properties for food packaging applications. The CNFs had fiber diameters between 10 and 80 nm and formed a highly entangled web-like structure. The incorporation of CNFs into the xylan-alginate matrix increased tensile strength and Young's modulus of the films, while improving water vapor permeability without significant impact on thermal properties.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Materials Science, Paper & Wood
Yan-Wen Zhao, Mao-Zhang Tian, Pei Huang
Summary: By introducing cellulose nanofibrils (CNFs) into the starch/clay system, crack-free and thermally insulative aerogels were successfully fabricated, resulting in a significant decrease in both density and thermal conductivity of the aerogel.
Article
Materials Science, Multidisciplinary
Xiuying Qiao, Zengyi Wang, Kang Sun
Summary: Cellulose nanofibrils fabricated from rice straw were used to reinforce poly(epsilon-capro-lactone) films, resulting in improved tensile strength and Young's modulus. However, the high loading of nanofibers had negative effects on the properties of the composite films.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Paper & Wood
Guangrui Ma, Ming He, Guihua Yang, Xingxiang Ji, Lucian A. Lucia, Jiachuan Chen
Summary: Vacuum drying is more beneficial for the redispersion of CNFs with NaCl, resulting in a more homogeneous fibril structure with lower mean particle sizes and higher water stability.
Article
Chemistry, Applied
Fatima Fneich, Julien Ville, Bastien Seantier, Thierry Aubry
Summary: Foams were produced from nanocellulose-based hydrogel precursors through freeze-drying, and the study revealed a strong correlation between the mechanical and thermal properties of the foams and the rheological properties of their hydrogel precursors. The research indicates that tuning the rheological properties of the hydrogel precursors can allow for control over the mechanical and thermal properties of the foams.
CARBOHYDRATE POLYMERS
(2021)
Article
Materials Science, Paper & Wood
Nayereh Dadoo, Sarah Zeitler, Ashlee D. McGovern, William M. Gramlich
Summary: The study focused on functionalizing cellulose nanofibrils (CNFs) with norbornene groups, enabling the creation of robust CNF hydrogels through thiol-ene click reactions. By varying reaction conditions, the hydrogels exhibited compression modulus values up to 25 kPa, with stable aqueous suspensions and shear thinning behavior. This approach improved aqueous stability and could have applications in sustainable materials and biomaterials.
Article
Chemistry, Applied
Mohammed Al-Gharrawi, Rachel Ollier, Jinwu Wang, Douglas W. Bousfield
Summary: Layers of cellulose nanofibers have great potential in food packaging due to their barrier properties, but may need water vapor barrier layers. Waterborne barrier coatings can provide this barrier, but their performance on CNF-layered paper has not been well described. Adding barrier pigment can improve properties, but may also introduce fine bubbles or defects affecting vapor transmission rates.
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2022)
Article
Chemistry, Applied
Mubarak Khlewee, Mohammed Al-Gharrawi, Doug Bousfield
Summary: A simple model based on Darcy's law was proposed to predict the penetration of polyethylene (PE) into paper and paper coated with cellulose nanofibers (CNF) in this study, and good agreement was obtained for different paper types, pressing times, and temperatures after using a calibration factor.
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2022)
Article
Biochemistry & Molecular Biology
Nasim Alikhani, Douglas W. Bousfield, Jinwu Wang, Ling Li, Mehdi Tajvidi
Summary: In this study, a simplified finite element analysis model was developed to simulate water vapor separation in a moisture-selective hollow-fiber membrane using COMSOL Multiphysics® software. The experimental data validated the simulated results, showing that the water vapor removal efficiency of the membrane system is affected by air velocity and vacuum pressure.
Article
Materials Science, Paper & Wood
Yaping Zhu, Douglas Bousfield, William Gramlich
Summary: This study investigates the effect of pigment properties on waterborne barrier coatings. The results demonstrate that talc has excellent water vapor resistance, and metalized PET flakes exhibit better failure resistance. Additionally, SB and NR latex coatings show better failure resistance, but excessive use of SB or NR latex may lead to production issues. The addition of kaolin improves water vapor barrier properties and failure resistance.
NORDIC PULP & PAPER RESEARCH JOURNAL
(2022)
Article
Polymer Science
Jalal Tavana, Atik Faysal, Anushka Vithanage, William M. Gramlich, Thomas J. Schwartz
Summary: In this study, we successfully synthesized functionalized delta-hexalactones (FDHLs) through the selective functionalization of 5-hydroxymethylfurfural (HMF) and subsequent ring-opening polymerization (ROP) of the oxidized HMF ethers. The key step in the production of FDHLs was the Ru-catalyzed selective hydrogenolysis of functionalized-2-furan carboxylic acids (FFCAs). We achieved high selectivity towards the lactone product by using a TiO2 support and a polar, aprotic solvent. Under optimized conditions, we obtained a 60% yield of FDHL using 5-phenoxy-2-furan carboxylic acid as a model reactant. The ROP of six-membered lactone monomers with methoxy or phenolic pendant groups resulted in polymers with different molecular weights and narrow dispersity. The poly(PDHL) with a bulky phenolic group exhibited a significantly higher glass transition temperature than unsubstituted poly(valerolactone).
Article
Polymer Science
Michael Flanders, William M. Gramlich
Summary: Curcumin was functionalized with a methacrylate monomer and copolymerized with OEGMA to create well-defined copolymers with improved solubility and stability. These copolymers retain the antioxidant and boron-binding properties of curcumin, making them suitable for biomedical applications.
Article
Materials Science, Multidisciplinary
Meghan E. Lamm, Kai Li, Katie Copenhaver, Peter V. Kelly, Hathaithep Senkum, Halil Tekinalp, William M. Gramlich, Soydan Ozcan
Summary: A simple strategy of synthesizing polyimine-coated cellulose nanofibrils (CNF) was developed for composite reinforcement. The polyimine coating allows CNF to be easily dried while maintaining its morphology and providing mechanical reinforcement in certain polymer composites. However, the coating may not be effective in other composite systems.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Mechanics
B. Nazari, E. Moghimi, D. W. Bousfield
Summary: A fundamental understanding of the transition from fluid-like to gel-like behavior is critical for a wide range of applications. This study examines the pipe flow behavior of a Herschel-Bulkley fluid and relates it to local yield stress and pressure gradients. Experimental results show discrepancies with modeling, which are attributed to a depletion layer caused by a water lubrication effect.
Article
Chemistry, Multidisciplinary
Megan E. E. Driscoll, Peter V. V. Kelly, William M. M. Gramlich
Summary: Hydrophobic cellulose nanofibrils (PS-MetCNFs) were prepared by grafting polystyrene onto modified CNFs, which effectively prevented fibrillar collapse during drying. The polystyrene was found to be both covalently and noncovalently bound to the PS-MetCNFs through polymerization in monomer-swollen polymer particles. The composites of PS-MetCNFs and poly-(lactic acid) exhibited improved mechanical properties compared to composites made with unmodified spray-dried CNFs, providing a new approach for CNF reinforcement without energy-intensive spray drying.
Article
Chemistry, Multidisciplinary
Mehdi Tajvidi, Ikramul Hasan, Jinwu Wang, Douglas Bousfield
Summary: In this study, self-standing films of lignin-containing cellulose nanofibrils derived from recycled old corrugated cardboard (OCC) pulp were created. These films exhibited high gas barrier properties, complete UV-shielding ability, and reduced water vapor permeability compared to films made from bleached softwood Kraft (BSK) pulp. The addition of carboxymethyl cellulose improved the predictability of oxygen permeability values in the films. Crosslinking with trivalent aluminum ion or polyamide epichlorohydrin further decreased the oxygen permeability while enhancing the mechanical properties of the films.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Peter V. Kelly, Siamak Shams Es-haghi, Meghan E. Lamm, Katie Copenhaver, Soydan Ozcan, Douglas J. Gardner, William M. Gramlich
Summary: This study proposes a water-based grafting method to improve the reinforcement effect of cellulose nanofibrils (CNFs) in poly(lactic acid) (PLA) composites while maintaining their fibrillar morphology. After spray drying, the modified CNFs showed a 490% increase in specific surface area, similar to conventional freeze drying. The polymer-grafted CNFs in PLA composites exhibited a 16% increase in tensile strength at a 20wt% loading and a 22% increase in stiffness at a 10wt% loading compared to unmodified CNF composites.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Engineering, Chemical
Mubarak Khlewee, William J. DeSisto, Douglas W. Bousfield
Summary: Understanding the dynamic fluid flow in a porous media with temperature changes is important for various applications. This study developed a model based on Darcy's law to quantify the penetration of hot melt adhesive into paper and proposed a model that considers process and material parameters. Experiments were conducted to validate the model, and the results showed good agreement. The permeability of the coating layer and the paper temperature were identified as key parameters influencing penetration depth.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)