Cellulose nanofibrils and silver nanoparticles enhances the mechanical and antimicrobial properties of polyvinyl alcohol nanocomposite film

Madivoli, Edwin Shigwenya; Kareru, Patrick; Gichuki, Joyline; Elbagoury, Mostafa M.

doi:10.1038/s41598-022-23305-7

Cited by 9 publications

(4 citation statements)

References 87 publications

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“…It can be observed that a nonuniform distribution of AgNPs is presented. This is in agreement with the previous article of Madivoli et al…”

Section: Resultssupporting

confidence: 94%

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Fabrication of Silver Nanoparticle Loaded into Nanocellulose Derived from Hemp and Poly(vinyl alcohol)-Based Composite as an Electrode for Electrochemical Sensors for Lactate Determination

Phumma,

Phamonpon,

Rodthongkum

et al. 2024

ACS Omega

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Nanocellulose derived from hemp (HNC) with the addition of silver nanoparticles (AgNPs) is utilized for improving the electrochemical sensing performances for lactate detection. Initially, HNC is chemically extracted and purified by using alkali treatment and acid hydrolysis. Then, AgNPs are nucleated in situ by the self-reduction process prior to forming a composite with poly(vinyl alcohol) (PVA). This nanocomposite significantly improves the electrochemical properties of the electrode, including electrochemical conductivity and electrocatalysis. The morphologies and chemical alterations of the HNC/AgNPs-PVA nanocomposite are investigated by field emission scanning electron microscopy. It demonstrates a three-dimensional network with random orientation of the nanocellulose fiber. The AgNPs are well-dispersed in the nanocomposite. Moreover, the nanocomposite provides high thermal stability up to 450 °C. Then, it is remarkably noted that 10 wt % HNC/AgNPs-PVA modified on the electrode provides the highest current responses, with a standard redox couple [(Fe(CN) 6 ] 3−/4− ]. For lactate detection, this modified screen-printed graphene electrode with nonimmobilized lactate oxidase exhibits an increase in the current signal with the increment of lactate concentration and offered a linear range of 0−25 mM, covering a cutoff value (12.5 mM) for muscle fatigue indication. Eventually, this sensor is successfully applied for lactate detection with high potential for a wearable lactate sensor.

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“…It can be observed that a nonuniform distribution of AgNPs is presented. This is in agreement with the previous article of Madivoli et al…”

Section: Resultssupporting

confidence: 94%

“…It can be observed that a nonuniform distribution of AgNPs is presented. This is in agreement with the previous article of Madivoli et al 19 Figure 1iii reports the mapping analysis allowing to investigate the elemental analysis of AgNPs. The blue color is typically due to the presence of AgNPs.…”

Section: Electrochemical Measurementsupporting

confidence: 91%

Fabrication of Silver Nanoparticle Loaded into Nanocellulose Derived from Hemp and Poly(vinyl alcohol)-Based Composite as an Electrode for Electrochemical Sensors for Lactate Determination

Phumma,

Phamonpon,

Rodthongkum

et al. 2024

ACS Omega

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“…Typically, chitosan exhibits broad peaks centred at about 2θ = 18º and 32º attributed to the presence OH and NH2 groups which form stronger interactions that impart some degree of crystallinity. On the other hand, being a precursor of cellulose, HEC exhibits diffraction peaks that are typically observed in cellulose nanofibers at 2θ angles of 16º, 22º and 34º which have been attributed to the diffraction planes of ( 101) and (002) characteristic of cellulose I 43,56 . Chemical crosslinking CMCs and HEC with citric acid resulted in one peak centered at 2θ = 21 being observed with sharp peaks at 2θ values of 31º, 37º, 45º, 56º and 75º.…”

Section: Xrd Results Of Cmcs-hec Compositementioning

confidence: 99%

Stimuli Responsive and Antimicrobial Cellulose-Chitosan Hydrogels Containing Polydiacetylene Nanosheets

Madivoli¹,

Schwarte²,

Kareru³

et al. 2023

Preprint

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Herein, we report a stimuli responsive hydrogel with inhibitory activity against Escherichia coli prepared by chemical crosslinking of carboxymethyl chitosan (CMCs) and hydroxyethyl cellulose (HEC). The hydrogels were prepared by esterification of chitosan (Cs) with monochloroacetic acid to produce CMCs which was then chemically crosslinked to HEC using citric acid as the crosslinking agent. To impart a stimuli responsiveness property to the hydrogels, polydiacetylene-zinc oxide (PDA-ZnO) nanosheets were synthesized in-situ during the crosslinking reaction followed by photopolymerization of the resultant composite. To achieve this, ZnO was anchored on carboxylic groups in 10,12-pentacosadiynoic acid (PCDA) layers to restrict movement of alkyl portion of PCDA during crosslinking CMCs and HEC hydrogels. This was followed by irradiating the composite with UV radiation to photopolymerize the PCDA to PDA within the hydrogel matrix so as to impart thermal and pH responsiveness to the hydrogel. From the results obtained, the prepared hydrogel had a pH dependant swelling capacity as it absorbed more water in acidic media as compared to basic media. Incorporation of PDA-ZnO resulted in a thermochromic composite responsive to pH evidenced by a visible colour transition from pale purple to pale pink. Upon swelling, PDA-ZnO-CMCs-HEC hydrogels had inhibitory activity against E. coli attributed to the slow release of the ZnO nanoparticles as compared to CMCs-HEC hydrogels.

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“…PVA nanocomposite films showed high degradation temperature (425°C) compared to the control PVA/PEG/PABA films (400°C) due to the presence of the AgNPs and their barrier properties against the diffusion of reactive species and thermal decomposition products within PVA matrices. On the other hand, Madivoli et al 132 examined how Ag functioned on (2,2,6,6‐Tetramethylpiperidin‐1‐yl) oxyl (TEMPO) oxidized cellulose nanofibrils (TOCNF) and PVA materials. The findings confirmed the formation of ionic bonds between the carboxylate present on the surface of CNF and the Ag + ion in the AgNO 3 solution to form AgNPs.…”

Section: Strategies For Improving the Thermal Stability Of Pvamentioning

confidence: 99%

Recent advances and challenges in thermal stability of PVA‐based film: A review

Suleiman,

Zeng,

Chakma

et al. 2024

Polymers for Advanced Techs

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Food packaging film is being developed using biodegradable polymers to prolong the shelf life of foods and address the environmental damage caused by non‐biodegradable plastics. Poly(vinyl alcohol) (PVA) is a biodegradable polymer with outstanding characteristics and can be easily shaped into a film. However, PVA‐based film still faces several obstacles that seriously restrict its practical application in the food packaging industry, particularly its low thermal stability limits the film process method. The growing preference demand for PVA‐based films with enhanced thermal stability in food packaging can be attributed to their advantageous characteristics, including commendable temperature resistance, safety, versatile processing capabilities, and prolonged shelf life. It is critical to comprehend the difficulties with PVA thermal degradation behavior and mechanism, and how to address this problem. In this review, we provide strategies for improving the thermal stability of PVA film including modification with environmentally friendly polymers, nanoparticles, and crosslinking agents. Also, the current challenges, and the potential for future advancements in the thermal stability of PVA and its composites are proposed. The new insight into the relationship between PVA based film processing and thermal properties of materials are expected to provide a valuable guide for developing PVA films with high thermal stability.

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Cellulose nanofibrils and silver nanoparticles enhances the mechanical and antimicrobial properties of polyvinyl alcohol nanocomposite film

Cited by 9 publications

References 87 publications

Fabrication of Silver Nanoparticle Loaded into Nanocellulose Derived from Hemp and Poly(vinyl alcohol)-Based Composite as an Electrode for Electrochemical Sensors for Lactate Determination

Fabrication of Silver Nanoparticle Loaded into Nanocellulose Derived from Hemp and Poly(vinyl alcohol)-Based Composite as an Electrode for Electrochemical Sensors for Lactate Determination

Stimuli Responsive and Antimicrobial Cellulose-Chitosan Hydrogels Containing Polydiacetylene Nanosheets

Recent advances and challenges in thermal stability of PVA‐based film: A review

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