Synthesis, characterization and antibacterial evaluation of nanofibrillated cellulose grafted by a novel quinolinium silane salt

Hassanpour, Anita; Asghari, Sakineh; Lakouraj, Moslem Mansour

doi:10.1039/c7ra02765f

Cited by 33 publications

(12 citation statements)

References 61 publications

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“…The patterns (Figure a) illustrate that the cross-linking reaction maintained the original crystalline structure and that the CrI varied significantly from 63.7% to 34.8% with increasing MTMS. A possible reason for this is that the grafted polysilane molecules broke the inter- and intramolecular hydrogen bonds of TCNF fibrils, which resulted in the opening of hydrogen-bonded cellulose chains and new amorphous region to be formed. − …”

Section: Resultsmentioning

confidence: 99%

Dual-Enhanced Hydrophobic and Mechanical Properties of Long-Range 3D Anisotropic Binary-Composite Nanocellulose Foams via Bidirectional Gradient Freezing

Chen

Yang

Fan

et al. 2019

ACS Sustainable Chem. Eng.

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Inspired by the structured architecture of natural materials, research has focused on the assembly of long-range three-dimensional (3D) anisotropic aligned structure through the synergy of silylated binary-composite and bidirectional gradient freezing using renewable and biocompatible cellulose nanofibrils. Low-cost methyltrimethoxysilane (MTMS) was introduced to reinforce the cross-linking strength between nanofibrils, simultaneously improving the surface hydrophobicity of cellulose foams. A copper coldfinger with a thermal insulative polydimethylsiloxane (PDMS) wedge was used to build bidirectional anisotropic aligned porous structures using bitemperature gradients to control the nucleation and propagation of ice crystals. This two-step method successfully assembled the cellulose nanofibrils into ultralight and ultraporous foams. The effects of freezing techniques, including freezer freezing, unidirectional gradient freezing, and bidirectional gradient freezing on the internal morphology and surface structure of modified foams have been thoroughly investigated by micro-CT and SEM characterizations. The developed 3D anisotropic honeycomb-like foams exhibited excellent compressive elasticity and enhanced ultraporous properties. Moreover, the synergistic effect of chemical techniques and freezing methods has realized a dual enhancement of the surface hydrophobicity and mechanical properties of cellulose foams. Our methodology could provide an effective way of achieving precise control of the final architecture of high-aspect-ratio fibril materials. Moreover, it offers a flexible process for preparing various functional composites: in particular, advanced materials such as for energy storage, thermal insulation, and composites requiring a higher level of structure control.

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Section: Resultsmentioning

confidence: 99%

Dual-Enhanced Hydrophobic and Mechanical Properties of Long-Range 3D Anisotropic Binary-Composite Nanocellulose Foams via Bidirectional Gradient Freezing

Chen

Yang

Fan

et al. 2019

ACS Sustainable Chem. Eng.

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“…The MCC treated with higher content of APTES showed a slightly higher nitrogen content, being the highest for MCC-Si (1:5). According to Hassanpour et al (2017), higher N content can be related to a successful grafting of the aminosilane onto the cellulose surface. Saini, Belgacem, Salon, & Bras, (2016) also found that the initial silane concentration signi cantly affected the grafting e ciency.…”

Section: Amount Of Aptes Grafted Onto MCC Surfacementioning

confidence: 99%

In-Depth Study of the Microcrystalline Cellulose Amino-Functionalization Efficiency

Duchemin

et al. 2021

Preprint

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Microcrystalline cellulose (MCC) has unique properties and its use as reinforcement for polymer composites has been increasing. However, the intrinsic incompatibility with most polymers requires surface modification to improve chemical compatibility prior to its incorporation into a polymer. In this paper, an in-depth study of silanization of MCC using 3-aminopropyltriethoxysilane (APTES), at different concentration, was done. The grafting amount of APTES onto MCC was determined by different methods: from residual mass and from nitrogen content. Solid-state 13C and 29Si nuclear magnetic resonance (NMR), field emission scanning electron microscopy with energy dispersive X-ray (SEM-EDX), spectroscopy plasma optical emission spectrometry (ICP), and a deep study of structural properties by X-ray diffraction were carried out. A better correlation for grafting amount of APTES onto MCC was observed for nitrogen content method than residual mass according the Pearson’s correlation. 13C NMR revealed all the carbon structures from cellulose and from APTES molecules and 29Si NMR revealed D, T and Q Si structures. The silane treatment did not alter the shape of MCC and all treated samples showed Si characteristic peak at ~ 1.75 kEv. From ICP was observed higher Si content before MCC addition than after, evidencing, once again, APTES grafting. The exposure to APTES in acidic medium caused several effects on the MCC, splitting larger Iβ crystallites in half and along the more reactive hydrophilic sides. The diameter of the smaller IVI crystallites was largely reduced by the treatment, especially when the silane concentration was 1:5 (m/v), above which the diameter increases again.

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“…These superficial molecular features remain the grandest challenge to overcome during modification to enhance processability and performance. 19 Moreover, at higher fibrillation, the amorphous-to-crystalline ratio of its structure increases 20 and a greater number of surface hydroxyl groups become available due to higher exfoliation of fibrils. These fibrils tend to form hydrogen bonds with the ubiquitous water molecules resident in the system whereas the greater levels of amorphous regions permit more water molecules to enter the inter-and intrafibrillar spaces.…”

Section: ■ Introductionmentioning

confidence: 99%

The Topochemistry of Cellulose Nanofibrils as a Function of Mechanical Generation Energy

Salem

Starkey

Pal

et al. 2019

ACS Sustainable Chem. Eng.

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Nanofibrillated cellulose (NFC) has garnered significant attention as a sustainable biomaterial, but its chemical reactivity with respect to its generation, i.e., fibrillation, has heretofore been unexplored. We prepared NFC samples with varying levels of fibrillation by controlling mechanical energy followed by acetylation as a probe to explore chemical reactivity. The degree of substitution (DS) reached a global maximum after which, surprisingly, it dropped to lower values at higher fibrillation or higher input (generation) energies. This behavior was attributed to two factors: the presence of higher bound water molecules at fibrillated surfaces, which hinder accessibility to cellulose chains, and enhanced self-aggregation of surface hydroxyl groups of NFC due to formation of hydrogen bonds at higher fibrillation. The discovery of these two mitigating factors provides a promising physicochemical strategy for efficient and sustainable production and modification of NFC to optimize performance for different applications.

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Synthesis, characterization and antibacterial evaluation of nanofibrillated cellulose grafted by a novel quinolinium silane salt

Abstract: Nanofibrillated cellulose (NFC) is a bio-based nanomaterial with no intrinsic antibacterial properties.

Cited by 33 publications

References 61 publications

Dual-Enhanced Hydrophobic and Mechanical Properties of Long-Range 3D Anisotropic Binary-Composite Nanocellulose Foams via Bidirectional Gradient Freezing

Dual-Enhanced Hydrophobic and Mechanical Properties of Long-Range 3D Anisotropic Binary-Composite Nanocellulose Foams via Bidirectional Gradient Freezing

In-Depth Study of the Microcrystalline Cellulose Amino-Functionalization Efficiency

The Topochemistry of Cellulose Nanofibrils as a Function of Mechanical Generation Energy

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