Facile size evaluation of cellulose nanofibrils adsorbed on polypropylene substrates using fluorescence microscopy

Tagawa, Satomi; Ishida, Koichiro; Tsuji, Tsubasa; Kondo, Tetsuo

doi:10.1007/s10570-021-03759-0

Cited by 16 publications

(15 citation statements)

References 36 publications

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“…Prior to the CLSM investigations, the i-PP particles were mixed with Janus-type amphiphilic ACC-CNFs in an aqueous phase, fully dried, and stained with CFW. As reported by the authors previously, 26,30 it is possible to examine nanoscaled fibers by CLSM owing to scattering of the fluorescent emission even below the level of microscopic resolution. Figure 1a shows a bright-field image and Figure 1b shows a dark-field fluorescent image of a particle coated with the ACC-CNFs; Figure 1c was formed by merging the two.…”

Section: ■ Results and Discussionmentioning

confidence: 80%

“…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. There is also indirect evidence for the amphiphilicity that ACC-CNFs are able to stabilize oil-in-water (o/w) Pickering emulsions, , promote adhesion to isotactic polypropylene (i-PP) sheets, and switch the properties of polyolefin films from hydrophobic to hydrophilic by altering the water contact angles in a manner that is dependent on the number of spray coatings . Recently, Kondo et al proposed that micropellets of i-PP for injection molding can be coated with ACC-CNFs by simply shaking them in an aqueous dispersion .…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: ■ Results and Discussionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…In this way, the ACC process creates "amphiphilic CNFs with a Janus-type surface" having both hydrophobic and hydrophilic planes in a single nanofiber (ACC-CNF: see Fig. 1), and this enables their use to further extend towards surface modifiers, surfactants, emulsifiers, and dispersers [25,30,31].…”

Section: Introductionmentioning

confidence: 99%

Characterization of dual nano-size effects of ACC-cellulose nanofibrils on crystallization behavior of hydrophilic poly(vinyl alcohol)

Ishikawa

Kondo

2021

J Wood Sci

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This study attempts to clarify thermodynamic quantification on interaction between poly(vinyl alcohol) (PVA) and wood-derived cellulose nanofibrils (CNFs) obtained by aqueous counter collision (ACC) method. Aqueous mixtures of PVA/ACC-CNFs with various fiber widths were cast as the target materials. The interfacial interactions between the two components were characterized through thermodynamic evaluation of the crystalline PVA component as a probe in the cast mixture. As the result, surface properties of the ACC-CNFs found to reflect on the crystallization behavior of the interacted PVA component, resulting in dual nano-size effects of either diluent or nucleating agent. Melting point depression behaviors of the PVA component indicated that ACC-CNFs with thinner widths induced nucleation effects on PVA crystallization, whereas ACC-CNFs with ca. 100 nm in width encouraged diluent effects on PVA components. It is noted that this trend found to be reverse to the case for PVA/ACC-CNFs of bacterial nanocellulose previously reported.

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“…Recently, the surface characteristics of single ACC-CNFs have been visualized at the nanoscale using fluorescence microscopy (FM) observation with fluorescence probes (Tagawa et al, 2021). Fluorescent-probe carbohydratebinding modules (CBMs), Congo red (CR), and Calcofluor white (CFW) have been employed as reagents for the qualitative and quantitative evaluation of surface characteristics in ACC-CNFs, focusing on their hydrophobic and hydrophilic planes (Tsuji et al, 2021).…”

Section: (A) Calculated Potential Energy Of a Water Molecule In Acc P...mentioning

confidence: 99%

“…According to the fluorescence microscopy images, CNFs stained with CFW were approximately 10 times wider than those observed by field emission scanning electron microscopy (Tagawa et al, 2021). Therefore, the surface characteristics of CNFs can be visualized by confocal laser microscopy (CLMS) using site-specific fluorescence probes and a highly sensitive fluorescence detector.…”

Section: (A) Calculated Potential Energy Of a Water Molecule In Acc P...mentioning

confidence: 99%

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

Kondo

2023

KONA

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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.

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Facile size evaluation of cellulose nanofibrils adsorbed on polypropylene substrates using fluorescence microscopy

Cited by 16 publications

References 36 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

Characterization of dual nano-size effects of ACC-cellulose nanofibrils on crystallization behavior of hydrophilic poly(vinyl alcohol)

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

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