These cellulose nanofibers might be an alternative to petroleum-based plastics

These cellulose nanofibers might be an alternative to petroleum-based
Fig.1 (a) Formation of oriented CNF hydrogel on the anode by sandwiching a CNF/water dispersion between the anode and cathode, and applying a DC voltage between them. Oriented CNF hydrogels prepared at applied voltages of (b) 1, (c) 10, and (d) 40 V. Credit: Kasuga, et al.

Single-use plastics have saved many lives by improving sanitation in health care. However, the sheer quantity of plastic waste—which can take from tens to hundreds of years to decompose—is a global pollution scourge. But now, in a study recently published in ACS Nano, researchers from The Institute of Scientific and Industrial Research (SANKEN) at Osaka University and collaborating partners have developed exceptionally versatile hydrogels and moldings that might replace conventional plastics.

The global scale of plastic waste urgently requires solutions and is being addressed from diverse perspectives. For example, in August 2022, National Geographic published a feature on recycling and repurposing plastic waste. Nevertheless, "the only long-term solution is to develop inexpensive, high-performance, plastic-like alternatives that don't persist in the environment," says Takaaki Kasuga, lead and senior author. "This is an active area of research, but the proposed alternatives to date haven't met society's needs."

While researching the global need for a substitute, Kasuga and coworkers were inspired by . For example, these ultrasmall fibers help plants maintain rigid yet lightweight structures. In fact, on a pound-for-pound basis, nanofibers help wood to be—by some metrics—stronger than steel. The ability to tailor the hierarchical nature of such nanofibers has made them an active area of research in synthetic tissue and other bioengineering contexts.

Various techniques are currently available for molding nanofibers into a controlled orientation; i.e., to exhibit anisotropy. However, a simple technique that enables one to mold cellulose nanofibers from the nano- to macroscopic scale, on multiple spatial axes, has long been unavailable. To meet this need, Kasuga and coworkers used electrophoretic deposition to fabricate anisotropic cellulose--based hydrogels and moldings.

  • These cellulose nanofibers might be an alternative to petroleum-based
    Fig.2. (a) Multi-layered CNF hydrogel and (b) corresponding cross section observed with a cross-polarizer. (c) CNFs were deposited in the order: horizontal, vertical, random, and horizontal with respect to the anode by controlling the applied voltage. (d) Cartilage-like CNF hydrogel formed around a spherical electrode and (e) corresponding cross section observed with a cross-polarizer. (f) Corresponding schematic. Credit: Kasuga, et al., "One-pot hierarchical structuring of nanocellulose by electrophoretic deposition," ACS Nano
  • These cellulose nanofibers might be an alternative to petroleum-based
    Fig. 3(a) Spherical electrode, (b) horizontally oriented CNF hydrogel fixed on its surface, and (c, d) molded CNF film after drying the CNF hydrogel. Similarly obtained (e) cylindrical, (f) flower-like, and (g) mouthpiece-shaped molded CNF films. (h) Combining mask patterning, porous substrates, and vertically oriented CNFs. (i) CNF hydrogels with sharp structures fixed on porous substrates. (j) CNF microneedles after drying. Credit: Kasuga, et al., "One-pot hierarchical structuring of nanocellulose by electrophoretic deposition," ACS Nano

There were several especially impressive outcomes of this study. One, cellulose nanofibers were oriented horizontally, randomly, and vertically by simply changing the applied voltage. Two, a multilayer was easily prepared with alternating nanofiber orientations, in a manner that's reminiscent of biological tissue. Three, "we easily prepared complex architectures, such as microneedles and mouthpiece molds," says Kasuga. "The uniform nanofiber orientation helped suppress hydrogel cracking, and thus resulted in a smooth surface, upon drying."

The technique used in this study is not limited to cellulose nanofibers. For example, the researchers also used sodium alginate and nanoclay. Thus, multicomponent materials that exhibit controlled nanoscale orientations are also straightforward to prepare. An immediate application of this study is straightforward manufacturing of complex, hierarchical hydrogels and moldings over a wide range of spatial scales. Such ecofriendly hydrogels and moldings will be useful in health care, biotech, and other applications—and thus will help alleviate the need for petroleum-based plastics.

More information: Takaaki Kasuga et al, One-Pot Hierarchical Structuring of Nanocellulose by Electrophoretic Deposition, ACS Nano (2022). DOI: 10.1021/acsnano.2c06392

Journal information: ACS Nano

Provided by Osaka University

Citation: These cellulose nanofibers might be an alternative to petroleum-based plastics (2022, October 25) retrieved 30 January 2023 from https://phys.org/news/2022-10-cellulose-nanofibers-alternative-petroleum-based-plastics.html
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