Facile surface modification of amphiphilic cellulose nanofibrils prepared by aqueous counter collision

Yokota, Shingo; Tagawa, Satomi; Kondo, Tetsuo

doi:10.1016/j.carbpol.2020.117342

Cited by 20 publications

(8 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consequently, the CNFs (=ACC-CNFs) produced by ACC tend to have two different faces (=Janus type): a hydrophilic face resulting from the initial hydroxy groups and an exposed hydrophobic face (=the van der Waals face). Hence, ACC-CNFs are relatively hydrophobic compared with NCs produced by other physical/chemical processes, − that is, they are amphiphilic. Tsuji et al verified the presence of two types of faces composed of hydrophilic and hydrophobic planes on a single ACC-CNF surface, by visualization using confocal laser scanning microscopy (CLSM) with their site-specific probes.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Janus-Type Amphiphilic Cellulose Nanofibrils onto Microspheres of Semicrystalline Polymers

et al. 2021

Self Cite

View full text Add to dashboard Cite

Cellulose nanofibrils (CNFs), which are attracting increasing attention as sustainable biomass nano-objects, are believed to be hydrophilic. Recently, aqueous counter collision (ACC) has been used to produce Janus-type amphiphilic cellulose nanofibrils (ACC-CNFs) from various cellulosic raw materials. In the current study, ACC-CNFs were preferentially adsorbed onto hydrophobic isotactic polypropylene (i-PP) microparticles and linear low-density polyethylene (LLDPE), which demonstrated their characteristic amphiphilicity. This was achieved by simply mixing the constituents together in aqueous media. The products were visualized by confocal laser microscopy (CLMS). Thermodynamic measurements obtained by differential scanning calorimetry revealed that the melting points of i-PP/ACC-CNFs and LLDPE/ACC-CNFs were lower than those of the untreated polymers, which indicates interactions between the ACC-CNFs and the polymer surfaces. Coating the polymer particles with the ACC-CNFsas confirmed by CLMSappeared to reduce their melting points. This finding demonstrates the possibility of a novel fusion between synthetic polymeric materials and biomass nano-objects.

show abstract

Section: Introductionmentioning

confidence: 99%

Adsorption of Janus-Type Amphiphilic Cellulose Nanofibrils onto Microspheres of Semicrystalline Polymers

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Such acetylation reactions occur while maintaining the crystallinity and fibrous morphology of the original CNFs. The surfaces of films cast from these acetylated ACC-CNFs had unique self-aggregation properties (Ishida et al, 2021) that contrasted markedly with those of films cast from acetylated ACC-CNFs prepared in homogenous dispersions (Yokota et al, 2021).…”

Section: Specific Adsorption Phenomena Caused By Twomentioning

confidence: 95%

Cellulose Nanofibrils Pulverized from Biomass Resources: Past, Present, and Future Perspectives

Kondo

2023

KONA

Self Cite

View full text Add to dashboard Cite

Advances in nanotechnology have changed conventional concepts in materials science. This has aloso strongly influenced natural biomass products with hierarchically built-up structures. In general, hierarchical structures in biobased materials are built up by molecular self-assembly, followed by nanoassembly to form higher-level structures. Key to each step is the formation of interactions at each individual scale. Nature usually achieves such fabrication through a bottom-up process. However, fabrication can also be achieved through a top-down process, with various such downsizing methods now in development. This review article aims to describe trends in nanofiber technology among downsizing processes applied to cellulose as a representative biomass, ranging from fundamentals to recent techniques. The advantages of our recently developed technique, nanopulverization by aqueous counter collision, are also discussed. This method successfully decomposes interactions selectively without damaging the molecular structure, finally liberating components of various sizes into water to provide a transparent and homogeneous component-water system. As nanocellulose research is a broad area involving various fields, the cited references are limited to the scope of the author's knowledge.

show abstract

“…The number of collisions and the collision pressure are the influencing factors to determine the performance of the obtained nanofibers [ 107 ]. More interestingly, compared with other CNFs, CNF prepared by ACC (ACC-CNF) has a relatively hydrophobic surface [ 108 ], since ACC could increase the I α Phase transition to a more stable I β Phase, while keeping its crystalline structure unchanged [ 107 ]. Yokota et al further modified the ACC-CNF through acetylation without changing the original nanofiber morphology, which has proven to improve the dispersibility of the nanocellulose in water and stabilize plastic resin particles in water [ 108 ].…”

Section: Preparation and Characteristics Of Nanocellulosementioning

confidence: 99%

“…More interestingly, compared with other CNFs, CNF prepared by ACC (ACC-CNF) has a relatively hydrophobic surface [ 108 ], since ACC could increase the I α Phase transition to a more stable I β Phase, while keeping its crystalline structure unchanged [ 107 ]. Yokota et al further modified the ACC-CNF through acetylation without changing the original nanofiber morphology, which has proven to improve the dispersibility of the nanocellulose in water and stabilize plastic resin particles in water [ 108 ]. Ishida et al prepared a Pickering emulsion by adsorbing ACC-CNF onto the O/W interface, which was then used as a reaction platform for chemical modification to introduced acetyl groups due to the increased surface [ 109 ].…”

Section: Preparation and Characteristics Of Nanocellulosementioning

confidence: 99%

Emerging Food Packaging Applications of Cellulose Nanocomposites: A Review

Zhang

Zhong

et al. 2022

Polymers

View full text Add to dashboard Cite

Cellulose is the most abundant biopolymer on Earth, which is synthesized by plants, bacteria, and animals, with source-dependent properties. Cellulose containing β-1,4-linked D-glucoses further assembles into hierarchical structures in microfibrils, which can be processed to nanocellulose with length or width in the nanoscale after a variety of pretreatments including enzymatic hydrolysis, TEMPO-oxidation, and carboxymethylation. Nanocellulose can be mainly categorized into cellulose nanocrystal (CNC) produced by acid hydrolysis, cellulose nanofibrils (CNF) prepared by refining, homogenization, microfluidization, sonification, ball milling, and the aqueous counter collision (ACC) method, and bacterial cellulose (BC) biosynthesized by the Acetobacter species. Due to nontoxicity, good biodegradability and biocompatibility, high aspect ratio, low thermal expansion coefficient, excellent mechanical strength, and unique optical properties, nanocellulose is utilized to develop various cellulose nanocomposites through solution casting, Layer-by-Layer (LBL) assembly, extrusion, coating, gel-forming, spray drying, electrostatic spinning, adsorption, nanoemulsion, and other techniques, and has been widely used as food packaging material with excellent barrier and mechanical properties, antibacterial activity, and stimuli-responsive performance to improve the food quality and shelf life. Under the driving force of the increasing green food packaging market, nanocellulose production has gradually developed from lab-scale to pilot- or even industrial-scale, mainly in Europe, Africa, and Asia, though developing cost-effective preparation techniques and precisely tuning the physicochemical properties are key to the commercialization. We expect this review to summarise the recent literature in the nanocellulose-based food packaging field and provide the readers with the state-of-the-art of this research area.

show abstract

Facile surface modification of amphiphilic cellulose nanofibrils prepared by aqueous counter collision

Cited by 20 publications

References 42 publications

Adsorption of Janus-Type Amphiphilic Cellulose Nanofibrils onto Microspheres of Semicrystalline Polymers

Adsorption of Janus-Type Amphiphilic Cellulose Nanofibrils onto Microspheres of Semicrystalline Polymers

Cellulose Nanofibrils Pulverized from Biomass Resources: Past, Present, and Future Perspectives

Emerging Food Packaging Applications of Cellulose Nanocomposites: A Review

Contact Info

Product

Resources

About