Bacterial Cellulose‐Based Nanocomposites: Roadmap for Innovative Materials

Figueiredo, Ana Raquel; Vilela, Carla; Neto, Carlos Pascoal; Silvestre, Armando J. D.; Freire, Carmen S.R.

doi:10.1002/9781118872246.ch2

Cited by 22 publications

(12 citation statements)

References 274 publications

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“…BNC, a nanocellulose biosynthesized in nature [14], is an exopolysaccharide with the ability to lodge all kinds of molecules and macromolecules within its ultrafine nanofibrous network with the goal of preparing materials with distinct features and thus different application fields [15,16,17]. Therefore, the design of BNC nanocomposites [18] with smart and active functions is quite pertinent in the areas of active and intelligent food packaging [19,20,21].…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial and Conductive Nanocellulose-Based Films for Active and Intelligent Food Packaging

et al. 2019

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Bacterial nanocellulose (BNC) is becoming an important substrate for engineering multifunctional nanomaterials with singular and tunable properties for application in several domains. Here, antimicrobial conductive nanocomposites composed of poly(sulfobetaine methacrylate) (PSBMA) and BNC were fabricated as freestanding films for application in food packaging. The nanocomposite films were prepared through the one-pot polymerization of sulfobetaine methacrylate (SBMA) inside the BNC nanofibrous network and in the presence of poly(ethylene glycol) diacrylate as cross-linking agent. The ensuing films are macroscopically homogeneous, more transparent than pristine BNC, and present thermal stability up to 265 °C in a nitrogen atmosphere. Furthermore, the films have good mechanical performance (Young’s modulus ≥ 3.1 GPa), high water-uptake capacity (450–559%) and UV-blocking properties. The zwitterion film with 62 wt.% cross-linked PSBMA showed bactericidal activity against Staphylococcus aureus (4.3–log CFU mL−1 reduction) and Escherichia coli (1.1–log CFU mL−1 reduction), and proton conductivity ranging between 1.5 × 10−4 mS cm−1 (40 °C, 60% relative humidity (RH)) and 1.5 mS cm−1 (94 °C, 98% RH). Considering the current set of properties, PSBMA/BNC nanocomposites disclose potential as films for active food packaging, due to their UV-barrier properties, moisture scavenging ability, and antimicrobial activity towards pathogenic microorganisms responsible for food spoilage and foodborne illness; and also for intelligent food packaging, due to the proton motion relevant for protonic-conduction humidity sensors that monitor food humidity levels.

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Section: Introductionmentioning

confidence: 99%

Antimicrobial and Conductive Nanocellulose-Based Films for Active and Intelligent Food Packaging

et al. 2019

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“…The high interest in the latter nanocellulose, viz . the exopolysaccharide BNC biosynthesized by some non-pathogenic bacterial strains [9], lies in its 3D structure with an ultrafine network of physically entangled cellulose nanofibers, which is responsible for its in-situ moldability, shape retention, inherent biodegradability, high water-holding capacity and porous structure [10,11].…”

Section: Introductionmentioning

confidence: 99%

Zwitterionic Nanocellulose-Based Membranes for Organic Dye Removal

et al. 2019

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The development of efficient and environmentally-friendly nanomaterials to remove contaminants and pollutants (including harmful organic dyes) ravaging water sources is of major importance. Herein, zwitterionic nanocomposite membranes consisting of cross-linked poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC) and bacterial nanocellulose (BNC) were prepared and tested as tools for water remediation. These nanocomposite membranes fabricated via the one-pot polymerization of the zwitterionic monomer, 2-methacryloyloxyethyl phosphorylcholine, within the BNC three-dimensional porous network, exhibit thermal stability up to 250 °C, good mechanical performance (Young’s modulus ≥ 430 MPa) and high water-uptake capacity (627%–912%) in different pH media. Moreover, these zwitterionic membranes reduced the bacterial concentration of both gram-positive (Staphylococcus aureus) and gram-negative (Escherichia coli) pathogenic bacteria with maxima of 4.3– and 1.8–log CFU reduction, respectively, which might be a major advantage in reducing or avoiding bacterial growth in contaminated water. The removal of two water-soluble model dyes, namely methylene blue (MB, cationic) and methyl orange (MO, anionic), from water was also assessed and the results demonstrated that both dyes were successfully removed under the studied conditions, reaching a maximum of ionic dye adsorption of ca. 4.4–4.5 mg g−1. This combination of properties provides these PMPC/BNC nanocomposites with potential for application as antibacterial bio-based adsorbent membranes for water remediation of anionic and cationic dyes.

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“…In recent years, particular attention has been devoted to the development of BC-based nanocomposite materials with several polymeric matrices as a result of the unique mechanical properties of BC [7][8][9][10]. Although most of the strategies that are used to obtain BC-based (nano)composites include compounding with synthetic polymer matrices, or blending with other natural polymers, the in-situ polymerization of monomers within the BC network is also being explored.…”

Section: Introductionmentioning

confidence: 99%

Poly(glycidyl methacrylate)/bacterial cellulose nanocomposites: Preparation, characterization and post-modification

Faria

Vilela

Mohammadkazemi

et al. 2019

International Journal of Biological Macromolecules

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Nanocomposites composed of poly(glycidyl methacrylate) (PGMA) and bacterial cellulose (BC) were prepared by the in-situ free radical polymerization of glycidyl methacrylate (GMA) inside the BC network. The resulting nanocomposites were characterized in terms of structure, morphology, water-uptake capacity, thermal stability and viscoelastic properties. The three-dimensional structure of BC endowed the nanocomposites with good thermal stability (up to 270°C) and viscoelastic properties (minimum storage modulus = 80 MPa at 200°C). In addition, the water-uptake and crystallinity decreased with the increasing content of the hydrophobic and amorphous PGMA matrix. These nanocomposites were then submitted to post-modification via acid-catalysed hydrolysis to convert the hydrophobic PGMA into the hydrophilic poly(glyceryl methacrylate) (PGOHMA) counterpart, which increased the hydrophilicity of the nanocomposites and consequently improved their wateruptake capacity. Besides, the post-modified nanocomposites maintained a good thermal stability (up to 250°C), viscoelastic properties (minimum storage modulus = 171 MPa at 200°C) and porous structure. In view of these results, the PGMA/BC nanocomposites can be used as functional hydrophobic nanocomposites for postmodification reactions, whereas the PGOHMA/BC nanocomposites might have potential for biomedical applications requiring hydrophilic, swellable and biocompatible materials.

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Bacterial Cellulose‐Based Nanocomposites: Roadmap for Innovative Materials

Cited by 22 publications

References 274 publications

Antimicrobial and Conductive Nanocellulose-Based Films for Active and Intelligent Food Packaging

Antimicrobial and Conductive Nanocellulose-Based Films for Active and Intelligent Food Packaging

Zwitterionic Nanocellulose-Based Membranes for Organic Dye Removal

Poly(glycidyl methacrylate)/bacterial cellulose nanocomposites: Preparation, characterization and post-modification

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