Cellulose nanocrystal based multifunctional nanohybrids

Lizundia, Erlantz; Puglia, Debora; Nguyen, Thanh‐Dinh; Armentano, Ilaria

doi:10.1016/j.pmatsci.2020.100668

Cited by 125 publications

(89 citation statements)

References 324 publications

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“…Among those NPs, nanocellulose obtained both by hydrolysis (cellulose nanocrystals, CNC) and bacterial means (Bacterial Nanocellulose, BNC) are, nowadays, fields which are intensively studied 29–31 . However, no studies have dealt with the development of RPUFs nanostructured with BNC, which is the main focus of this work.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured rigid polyurethane foams with improved specific thermo‐mechanical properties using bacterial nanocellulose as a hard segment

Benavides

Armanasco

Cerrutti

et al. 2021

J of Applied Polymer Sci

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Rigid polyurethane foams (RPUFs) were synthesized with bacterial nanocellulose (BNC) at concentrations of up to 0.5 wt% using two insertion routes based on its reaction with the isocyanate precursor (ISO route) and the formation of a colloidal dispersion in the polyol precursor (POL route). The results indicated that, for BNC concentrations of only 0.1 wt%, drastic improvements of the specific elastic compressive modulus (+244.2%) and strength (+77.5%) were measured for foams with apparent density of 46.4+/− 4.7 Kg.m−3. The chemical reaction of BNC with the precursor was corroborated through the measurement of the isocyanate number and FTIR analysis. The BNC caused a significant nucleation effect, decreasing the cell size up to 39.7%. Differential scanning calorimetry analysis revealed that the BNC had a strong effect on post‐cure enthalpy, particularly for the POL route. Dynamical mechanical thermal analysis under flexural conditions proved that, regardless of BNC concentration, the incorporation of BNC caused anisotropy and that the ISO route contributed to an enhanced damping factor at high temperatures. These results prove that the ISO route is a key aspect to achieve foamed nanocomposites with improved specific mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Nanostructured rigid polyurethane foams with improved specific thermo‐mechanical properties using bacterial nanocellulose as a hard segment

Benavides

Armanasco

Cerrutti

et al. 2021

J of Applied Polymer Sci

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“…It should be taken into account that due to the sulphuric acid hydrolysis, CNC surfaces are decorated with anionic sulphate ester groups (-OSO 3 − ), yielding nanoparticles comprising approximately 0.6% to 0.8% of elemental sulphur by weight (zeta-potential values of nearly −40 mV). Therefore, CNCs are covered by a negative electrostatic charge, rendering acidic pH values when dispersed in water [24]. In order to obtain homogeneous free-standing films with no IL degradation (which in turn may yield decreased functional properties), such IL should be compatible with acidic pH values.…”

Section: Morphological Characterizationmentioning

confidence: 99%

“…As a novel cellulose-derivative, CNCs are nanoscale spindle-shaped crystals extracted upon the controlled hydrolysis of native cellulose [24]. The ability of CNCs to form iridescent chiral nematic structures was used to obtain materials with stimuli-responsive actuation behavior and variation in photonic properties [22].…”

Section: Introductionmentioning

confidence: 99%

Cellulose Nanocrystal and Water-Soluble Cellulose Derivative Based Electromechanical Bending Actuators

et al. 2020

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This study reports a versatile method for the development of cellulose nanocrystals (CNCs) and water-soluble cellulose derivatives (methyl cellulose (MC), hydroxypropyl cellulose (HPC), and sodium carboxymethyl cellulose (NaCMC)) films comprising the ionic liquid (IL) 2-hydroxy-ethyl-trimethylammonium dihydrogen phosphate ([Ch][DHP]) for actuator fabrication. The influence of the IL content on the morphology and physico–chemical properties of free-standing composite films was evaluated. Independently of the cellulose derivative, the ductility of the films increases upon [Ch][DHP] incorporation to yield elongation at break values of nearly 15%. An increase on the electrical conductivity as a result of the IL incorporation into cellulosic matrices is found. The actuator performance of composites was evaluated, NaCMC/[Ch][DHP] showing the maximum displacement along the x-axis of 9 mm at 8 Vpp. Based on the obtained high electromechanical actuation performance, together with their simple processability and renewable nature, the materials fabricated here represent a step forward in the development of sustainable soft actuators of high practical relevance.

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“…It has been shown that nanocellulose can be employed to prepare various high-value products with low environmental and societal impact. Nanocellulose has attracted a tremendous level of attention as revealed by the increasing number of scientific contributions and industrial investments in several fields (Trache, 2018;Dufresne, 2019;Naz et al, 2019;Charreau et al, 2020;Lizundia et al, 2020;Trache et al, 2020b;Zhao et al, 2020). The three-dimensional hierarchical structures that constitute these cellulose nanofibers at different scales, the combination of the physicochemical properties of cellulose, together with various advantages of nanomaterials (e.g., a high specific surface area, aspect ratio) open new opportunities in several fields, ranging from electronics to medical applications.…”

Section: Recent Trends In Preparation Characterization and Applicatimentioning

confidence: 99%

Editorial: Recent Trends in Preparation, Characterization and Applications of Nanocellulose

Hussin

Brosse

2020

Front. Chem.

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Cellulose nanocrystal based multifunctional nanohybrids

Cited by 125 publications

References 324 publications

Nanostructured rigid polyurethane foams with improved specific thermo‐mechanical properties using bacterial nanocellulose as a hard segment

Nanostructured rigid polyurethane foams with improved specific thermo‐mechanical properties using bacterial nanocellulose as a hard segment

Cellulose Nanocrystal and Water-Soluble Cellulose Derivative Based Electromechanical Bending Actuators

Editorial: Recent Trends in Preparation, Characterization and Applications of Nanocellulose

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