Topochemical Engineering of Cellulose-Based Functional Materials

Sobhanadhas, LijiSobhana S.; Kesavan, Lokesh; Fardim, Pedro

doi:10.1021/acs.langmuir.7b04379

Cited by 25 publications

(15 citation statements)

References 103 publications

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“…The crystallinity index (CI) calculation, based on the XRD results, reveals that HCIT-4 has a lower CI than HECH; that is 48.7% for HCIT-4 and 53.7% for HECH. The Ci of the studied hydrogel was comparable to the literature [4].…”

Section: Characterization Of the Hydrogelssupporting

confidence: 86%

“…The dry hydrogel mass is ± 0.5 g. Figure 1 shows the synthetic pathway of the CIT-crosslinked hydrogel. In the first step, the presence of a hydrotropic solvent induces the hydrogen bond disruption of cellulose [3,4,12]. The disrupted sites of cellulose are vulnerable to nucleophilic attacks; these sites are the target of modification (crosslinking) in the next step [13].…”

Section: Synthesis Of Hydrogelmentioning

confidence: 99%

“…Cellulose dissolution and crosslinking are the two fundamental steps in the preparation of cellulose hydrogels [3,4]. The presence of hydrotropic substances (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Citric Acid-crosslinked Cellulosic Hydrogel from Sugarcane Bagasse: Preparation, Characterization, and Adsorption Study

et al. 2020

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In this work, citric acid (CIT) is proposed as a harmless alternative to epichlorohydrin (ECH) for crosslinking in the synthesis of cellulose hydrogels. Sugarcane bagasse was utilized as a source of cellulose fibers. Cellulose fibers were disintegrated using the solvent-dissolution method before forming a gel-like solution. Subsequently, CIT was added to initiate crosslinking, and the behavior was evaluated by adding various amounts of citric acid (0, 20, 30, and 40 wt%). Cellulose hydrogel with a good mechanical strength (10 mm penetration depth) was obtained from crosslinking using 40 wt% of CIT (HCIT-4), which is comparable to ECH-cross-linked hydrogel (HECH) that has a penetration depth of 8 mm. A proper amount of CIT molecules allows the crosslinking of the cellulose fibers into the hydrogel. The FT-IR analysis reveals a C-O-C band blue-shifting for HCIT-4 compared to HECH, with a gap difference of 82 cm-1. The crystallinity from XRD patterns of HCIT-4 is comparable to that of HECH, which confirms that CIT can be used as a substitute for ECH. The adsorption ability was evaluated against methylene blue dye, the isotherm and kinetic adsorption models for the adsorption system were determined. Freundlich and pseudo-second-order models correlate well to isotherm and kinetics data, suggests that the adsorbent possesses heterogeneous surface sites which adsorption controlled by chemisorption. The prepared HCIT-4 was able to remove 24.88 mg methylene blue/g of the hydrogel at 70 °C, meanwhile HECH only able to remove 12.01 mg/g. The adsorption capacity was increased when adsorption temperature increased, suggesting endothermic behavior.

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Section: Characterization Of the Hydrogelssupporting

confidence: 86%

Section: Synthesis Of Hydrogelmentioning

confidence: 99%

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Citric Acid-crosslinked Cellulosic Hydrogel from Sugarcane Bagasse: Preparation, Characterization, and Adsorption Study

et al. 2020

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“…A key advantage is that careful chemical modification of the hydrogel precursors enables control of the mechanical strength and elasticity of the resultant films. Recently, double‐network (DN) based hydrogels made from polysaccharides have begun to replace both traditional, covalent DN hydrogels and reinforced, single‐network hydrogels, due to their high strength, toughness, and transparency . In most cases, the resultant materials are colorless because cellulose itself does not absorb visible light, nor does it scatter light significantly .…”

Section: Introductionmentioning

confidence: 99%

An Optically Responsive Soft Etalon Based on Ultrathin Cellulose Hydrogels

Dong

Akinoglu

Zhang

et al. 2019

Adv Funct Materials

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Stimuli-responsive optical etalons are an exciting class of next-generation sensors because they are scalable, cost-effective and offer tunability of their optical response across the entire UV-vis-NIR wavelength range. In this study, double-network cellulose hydrogels are used as a soft, responsive medium and are incorporated into Fabry-Pérot optical etalons. The thin cellulose hydrogel layer can be solution processed. The hygroscopic hydrogel undergoes both refractive index and thickness changes in response to changes in humidity. This leads to strong changes in reflection due to optical interference within the metal-insulator-metal (MIM) cavity. The response can be optimized by adjusting the chemical crosslinker ratio. These flexible MIM structures provide a robust platform for optically based chemical sensors.

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“…Topochemical engineering is a method of designing the fractionation (disassembly) and fabrication (assembly) of highly engineered functional materials using a combination of molecular and supramolecular techniques. Topochemical engineering is inspired by bioassembly observed in natural systems such as trees and microorganisms [14]. The present work utilizes the approach of hydrogen bonding with external hydrophobic moieties in order to bring water-repelling properties to the cellulose fiber surface.…”

Section: Introductionmentioning

confidence: 99%

Topochemical engineering of composite hybrid fibers using layered double hydroxides and abietic acid

Sobhana¹,

Kesavan²,

Gustafsson³

et al. 2019

Beilstein J. Nanotechnol.

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Topochemical engineering of hybrid materials is an efficient way of synthesizing hydrophobic and highly tensile fiber composites by utilizing the intermolecular hydrogen bonds in natural materials. These materials include wood pulp fibers, abietic acid (resin acid) and inexpensive metal salts. In this work, a hybrid composite was created using bleached and unbleached kraft pulp fibers as cellulose platform. In situ co-precipitation of layered double hydroxide (LDH) was performed to grow LDH crystals on the surface of the cellulose fibers, followed by the immobilization of abietic acid (AA) on LDH-grafted cellulose. Here we aimed to benefit from the hydrogen bonding between –OH groups of cellulose and LDH, and the –COOH groups of AA to obtain charge-directed assembly of one material on the other material. Thus, composite hybrid fibers (C-HF) were produced and then characterized by optical (CAM), spectroscopic (XRD, IR) and microscopic techniques (SEM) to determine their average length and distribution, structure and purity, bonding, and morphology. These fibers further were tested for water contact angle (hydrophobicity), oil absorption (lipophilicity), tensile strength and ISO brightness measurements. The performance of C-HF was compared with unmodified reference fibers (REF), fibers composed with only AA (C-F) and LDH-hybridized fibers (HF). The results revealed a variety of correlations between materials and their properties due to characteristic surface morphology, functional groups, hydrogen bonding and natural co-materials such as lignin and hemicelluloses. Attractive and repulsive van der Waals forces between material entities play a crucial role in the resulting properties.

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Topochemical Engineering of Cellulose-Based Functional Materials

Cited by 25 publications

References 103 publications

Citric Acid-crosslinked Cellulosic Hydrogel from Sugarcane Bagasse: Preparation, Characterization, and Adsorption Study

Citric Acid-crosslinked Cellulosic Hydrogel from Sugarcane Bagasse: Preparation, Characterization, and Adsorption Study

An Optically Responsive Soft Etalon Based on Ultrathin Cellulose Hydrogels

Topochemical engineering of composite hybrid fibers using layered double hydroxides and abietic acid

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