Interconnected macropores cryogel with nano-thin crosslinked network regenerated cellulose

Salleh, Kushairi Mohd; Zakaria, Sarani; Gan, Sinyee; Baharin, Khairunnisa Waznah; Ibrahim, Nur Ain; Zamzamin, Rohana

doi:10.1016/j.ijbiomac.2019.12.240

Cited by 19 publications

(5 citation statements)

References 24 publications

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“…As expected, the resulting increase in average pore size, from mesopores to macropores, yields a considerable reduction in the BET surface area (Table 1). The pore architecture of cellulose-CMC beads reported here displays a regular morphology, contrasting with results from Chang et al [34] and Salleh et al [33], who documented large microcavities in the respective cellulose-CMC gels. The complementary characterization of the produced beads was carried out with recourse to low-field NMR relaxometry.…”

Section: Samplecontrasting

confidence: 99%

“…Typically, carboxymethyl cellulose-based hydrogels display a high sorption capacity, desirable for ecological superabsorbent applications [30][31][32]. A comparison of the hybrid hydrogel beads prepared in this paper revealed lower swelling compared to the cross-linked CMC-cellulose sheets prepared by Salleh et al [33] and Chang et al [34], an effect ascribed to the higher cellulose content in the herein-reported beads, as well as the different gel fabrication process employed.…”

Section: Samplementioning

confidence: 60%

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Topochemical Engineering of Cellulose—Carboxymethyl Cellulose Beads: A Low-Field NMR Relaxometry Study

Wever

Oliveira‐Silva²,

Marreiros³

et al. 2020

Molecules

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The demand for more ecological, highly engineered hydrogel beads is driven by a multitude of applications such as enzyme immobilization, tissue engineering and superabsorbent materials. Despite great interest in hydrogel fabrication and utilization, the interaction of hydrogels with water is not fully understood. In this work, NMR relaxometry experiments were performed to study bead–water interactions, by probing the changes in bead morphology and surface energy resulting from the incorporation of carboxymethyl cellulose (CMC) into a cellulose matrix. The results show that CMC improves the swelling capacity of the beads, from 1.99 to 17.49, for pure cellulose beads and beads prepared with 30% CMC, respectively. Changes in water mobility and interaction energy were evaluated by NMR relaxometry. Our findings indicate a 2-fold effect arising from the CMC incorporation: bead/water interactions were enhanced by the addition of CMC, with minor additions having a greater effect on the surface energy parameter. At the same time, bead swelling was recorded, leading to a reduction in surface-bound water, enhancing water mobility inside the hydrogels. These findings suggest that topochemical engineering by adjusting the carboxymethyl cellulose content allows the tuning of water mobility and porosity in hybrid beads and potentially opens up new areas of application for this biomaterial.

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Section: Samplecontrasting

confidence: 99%

Section: Samplementioning

confidence: 60%

Topochemical Engineering of Cellulose—Carboxymethyl Cellulose Beads: A Low-Field NMR Relaxometry Study

Wever

Oliveira‐Silva²,

Marreiros³

et al. 2020

Molecules

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“…Based on Table 4 , the moisture content of CT/CMC + CA gradually decreases with the increase in the coating layer in all drying regimes. Increases in coating layers resulted in an increase in ionic strength, which reduced the number of mobile ions within the CMC + CA coating matrix, thus reducing the CMC + CA coating structure and limiting the moisture content of CT/CMC + CA [ 38 ]. The result is similar to the findings of other biomaterials, such as membrane [ 39 ] and hydrogel films [ 29 , 40 ], that are cross-linked with CA.…”

Section: Resultsmentioning

confidence: 99%

Impact of Drying Regimes and Different Coating Layers on Carboxymethyl Cellulose Cross-Linked with Citric Acid on Cotton Thread Fibers for Wound Dressing Modification

et al. 2022

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The oldest preservation techniques used are drying techniques, which are employed to remove moisture and prevent microorganisms’ growths, prolonging a material’s shelf life. This study evaluates the effects of drying methods on carboxymethyl cellulose (CMC) + citric acid (CA) coating layers on cotton threads. For this reason, cotton threads were washed and then coated with different layers of CMC cross-linked with CA, followed by drying using an oven (OD), infrared (IR), and a combination of oven + IR (OIR) drying methods at 65 °C. Our investigations revealed that CMC + CA yields a pliable biopolymer. The differences in drying regimes and coating layers of CMC + CA have a significant effect on the coated cotton thread strength and absorption capability. The study concluded that the IR drying regime is more effective to dry a single-layered cotton thread with a single layer of CMC + CA coating to enhance desirable properties for wound dressing modification.

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“…However, the band was broadened on all RC beads in comparison to raw cotton linter, indicating that RC beads have a higher absorption ability than their previous form. This was due to the dissolved semi‐crystalline cellulose structure rearranged into the amorphous structure during the regeneration process, which afterward made them more absorptive 19,33 . Overall, the band characteristics change from raw cotton linter to RC beads, which were associated with the transition of cellulose I to cellulose II.…”

Section: Resultsmentioning

confidence: 99%

Effect of dimensionality of nanosized TiO₂ embedded in regenerated cellulose beads as a portable catalyst for reusable decomposition system

Evyan

Salleh

Chong

et al. 2021

Polymers for Advanced Techs

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Free‐standing titanium dioxide (TiO2) nanowires (TNW) with great photocatalysis performances were formed by using a simple hydrothermal method. Pre‐cool rapid dissolution technique was used to dissolve cellulose, and the regenerated cellulose (RC) beads were used as a portable host for absorption and photocatalytic reaction. Comparisons were made between zero‐dimensional TiO2 nanoparticle (TNP) and one‐dimensional TNW, which both were mixed separately with dissolved cellulose and regenerated into spherical beads. As regeneration involved physical interaction, there were no functional group changes observed on RC beads, as confirmed by Fourier‐transform infrared (FT‐IR) spectroscopy analysis. TNP and TNW maintained the crystallize phase after the regeneration process, thus confirming that aqueous LiOH/urea solvent had no chemical interaction with them. RC beads shaped, external and internal structures were morphologically examined with a field emission scanning electron microscope (FESEM). Due to the distinct dimensionality between TNW and TNP, interactions of physical crosslinking with dissolved cellulose are also different. This leads to different RC beads morphological structures, externally and internally. Changes in pore volume and percentage of weight gain were most prominent with the embedment of TNW. RC beads with TNP (TPB) had better photocatalytic performances than RC beads with TNW (TWB) in the 1st cycle but have poor recyclability in comparison to TWB after the 5th cycle. We concluded that the embedment of one‐dimensional TNW in RC beads promotes better photocatalytic behavior and performance as a portable catalyst.

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Interconnected macropores cryogel with nano-thin crosslinked network regenerated cellulose

Cited by 19 publications

References 24 publications

Topochemical Engineering of Cellulose—Carboxymethyl Cellulose Beads: A Low-Field NMR Relaxometry Study

Topochemical Engineering of Cellulose—Carboxymethyl Cellulose Beads: A Low-Field NMR Relaxometry Study

Impact of Drying Regimes and Different Coating Layers on Carboxymethyl Cellulose Cross-Linked with Citric Acid on Cotton Thread Fibers for Wound Dressing Modification

Effect of dimensionality of nanosized TiO₂ embedded in regenerated cellulose beads as a portable catalyst for reusable decomposition system

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Interconnected macropores cryogel with nano-thin crosslinked network regenerated cellulose

Cited by 19 publications

References 24 publications

Topochemical Engineering of Cellulose—Carboxymethyl Cellulose Beads: A Low-Field NMR Relaxometry Study

Topochemical Engineering of Cellulose—Carboxymethyl Cellulose Beads: A Low-Field NMR Relaxometry Study

Impact of Drying Regimes and Different Coating Layers on Carboxymethyl Cellulose Cross-Linked with Citric Acid on Cotton Thread Fibers for Wound Dressing Modification

Effect of dimensionality of nanosized TiO2 embedded in regenerated cellulose beads as a portable catalyst for reusable decomposition system

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Effect of dimensionality of nanosized TiO₂ embedded in regenerated cellulose beads as a portable catalyst for reusable decomposition system