Absorption kinetics of nanocellulose foams: Effect of ionic strength and surface charge

Hossain, Laila; Eastman, Emily; Rango, Monica De; Raghuwanshi, Vikram Singh; Tanner, Joanne; Garnier, Gil

doi:10.1016/j.jcis.2021.05.092

Cited by 10 publications

(6 citation statements)

References 26 publications

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“…3 ( Figure 7 ). The trend observed with the PPG-CMC films was a period of rapid swelling in the first 30 min which levelled off to a plateau over the 48 h. This is consistent with the swelling kinetics of cellulose-based materials ( Mendoza et al, 2019a ; Barajas-Ledesma et al, 2020 ; Hossain et al, 2021 ). The PEG-CMC and G-CMC films both reached their swelling equilibrium within 30 min, indicating water was only absorbed into the surface pores and swelling was inhibited by structural compaction ( Schott, 1992 ).…”

Section: Resultssupporting

confidence: 82%

“…The free swelling capacity and saline swelling capacity of each polymer were evaluated by immersion in deionized water and physiological saline (0.9% wt NaCl) respectively for 24 h and measuring the mass change. These solutions are common standards used for hydrogel swelling ( Hossain et al, 2021 ; Karoyo and Wilson, 2021 ; Zainal et al, 2021 ). For swelling kinetics in deionized water, samples were weighed after 2, 10, 30, 180, 1,440, and 2,880 min.…”

Section: Methodsmentioning

confidence: 99%

“…As the world progresses towards a renewable future, cellulose is becoming increasingly popular as a platform molecule for superabsorbent materials due to its low-cost, biocompatibility, and ability to modify for desired applications ( Alam et al, 2019 ; Mendoza et al, 2019a ; Barajas-Ledesma et al, 2020 ; Zainal et al, 2021 ). In our previous work we have investigated the synthesis and properties of TEMPO-oxidized cellulose-based hydrogels for agricultural and biomedical applications ( Mendoza et al, 2019b ; Curvello et al, 2019 ; Barajas-Ledesma et al, 2020 ; Hossain et al, 2021 ; Barajas-Ledesma et al, 2022 ).…”

Section: Introductionmentioning

confidence: 99%

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Modulating superabsorbent polymer properties by adjusting the amphiphilicity

et al. 2022

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The role of amphiphilicity in polysaccharide-based superabsorbent polymers is paramount in determining material properties. While the performance of freeze-dried polymers is improved by maximizing hydrophilicity, this may not be the case for evaporative-dried polymers. In this study, four diglycidyl ether crosslinkers, with varying chain lengths and amphiphilicities, were used to synthesize a series of evaporative-dried carboxymethyl cellulose-based superabsorbent films. Through structural and physiochemical characterization, the effect of amphiphilicity on swelling and mechanical properties was established. Contrary to freeze-dried polymers, it was found that the addition of hydrophobic moieties by crosslinking with novel poly(propylene glycol) diglycidyl ether crosslinkers increased the swelling performance of evaporative-dried polymers. By adding hydrophobic functional groups, a reduction in inter-chain hydrogen bonding occurs during evaporative-drying, reducing the degree of hornification and decreasing the entropy requirement for water uptake. By optimizing the amphiphilic ratio, a poly(propylene glycol)-carboxymethyl cellulose polymer achieved a swelling capacity of 182 g/g which is competitive with freeze-dried cellulose-based hydrogels. The mechanical properties of these films improved with the addition of the crosslinkers, with glycerol-carboxymethyl cellulose polymers achieving a tensile strength of 39 MPa and a Young’s Modulus of 4.0 GPa, indicating their potential application as low-cost, swellable films.

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Section: Resultssupporting

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modulating superabsorbent polymer properties by adjusting the amphiphilicity

et al. 2022

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“…The literature provides ample examples of absorptive membranes that can solve this problem. For example, carefully synthesized nanocellulose membranes with controlled patterns and surface charge result in systems with highly reproducible and tailored water transport properties which can mitigate these issues. , However, this is not a major concern in our case, as the sensor assays utilized in our work (described in the following section) themselves possess strong absorptive properties that minimize any issues that may arise from cases of uneven sample distribution.…”

Section: Resultsmentioning

confidence: 99%

A Soft Wearable Microfluidic Patch with Finger-Actuated Pumps and Valves for On-Demand, Longitudinal, and Multianalyte Sweat Sensing

et al. 2022

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Easy sample collection, physiological relevance, and ability to noninvasively and longitudinally monitor the human body are some of the key attributes of wearable sweat sensors. Examples typically include reversible sensors or an array of singleuse sensors embedded in specialized microfluidics for temporal analysis of sweat. However, evolving this field to a level that truly represents "lab-on-skin" technology will require the incorporation of advanced functionalities that give the user the freedom to (1) choose the precise time for performing sample analysis and (2) select sensors from an array embedded within the device for performing condition-specific sample analysis. Here, we introduce new concepts in wearable microfluidic platforms that offer such capabilities. The described technology involves a series of fingeractuated pumps, valves, and sensors incorporated within soft, wearable microfluidics. The incoming sweat collects in the inlet chamber and can be analyzed by the user at the time of their choosing. On-demand sweat analyte assessment is achieved by pulling a thin tab to activate a pump which opens a valve and allows the pooled sweat to enter a chamber embedded with sensors for the desired analytes. The article describes a thorough characterization of the platform that demonstrates the robustness of the pumping, valving, and sensing aspects of the device under conditions mimicking real-life scenarios. A two-day-long human pilot study validates the system and illustrates the device's ability to offer on-demand, longitudinal, and multianalyte sensing. Our work represents the first example of a wearable system with such on-demand sensing capabilities and opens exciting avenues in sweat sensing for acquiring new insights into human physiology.

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“…Water contamination by dyes from various industries, such as textiles, leather, and dyestuffs, has gotten more attention because the dyes in these industrial wastewaters are toxic, carcinogenic, and nonbiodegradable ( Yuanyuan Liu et al, 2015 ; Cho et al, 2015 ). As a result, a variety of technologies, including adsorption ( Hossain et al, 2021 ), photocatalytic degradation, chemical reduction or chemical oxidation, membrane filtration, flocculation, and electro-oxidation, have been used to remove these contaminants ( Panizza and Cerisola, 2009 ; Ali, 2012 ). Adsorption is one of the most effective methods to treat organic dyes, and it is widely used because of its relatively low cost and easy operation.…”

Section: Introductionmentioning

confidence: 99%

Mussel-Inspired Magnetic Dissolving Pulp Fibers Toward the Adsorption and Degradation of Organic Dyes

Yang

et al. 2022

Front. Chem.

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In this work, a simple synthetic method was used to prepare a new type of magnetic dissolving pulp (MDP) @polydopamine (PDA) fibers. The hydroxyl groups of the fibers were converted into carboxyl groups after succinylation. Fe3O4 nanoparticles were grown in situ on the fibers. The prepared MDP@PDA fibers have catalytic reduction efficiency and adsorption performance for methylene blue organic dyes, and it has been thoroughly tested under various pH conditions. Fe3O4@PDA fibers have high reusability, are easy to separate, and regenerate quickly. The catalytic and adsorption efficiency barely decreases after repeated use. The surface of dissolving pulp fibers with a functionalized multifunctional PDA coating is used to create multifunctional catalysts and adsorbent materials. This study presents a very useful and convenient method for the synthesis and adjustment of MDP@PDA fibers, which have a wide range of potential applications in catalysis and wastewater treatment.

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Absorption kinetics of nanocellulose foams: Effect of ionic strength and surface charge

Cited by 10 publications

References 26 publications

Modulating superabsorbent polymer properties by adjusting the amphiphilicity

Modulating superabsorbent polymer properties by adjusting the amphiphilicity

A Soft Wearable Microfluidic Patch with Finger-Actuated Pumps and Valves for On-Demand, Longitudinal, and Multianalyte Sweat Sensing

Mussel-Inspired Magnetic Dissolving Pulp Fibers Toward the Adsorption and Degradation of Organic Dyes

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