Synthesis, characterization and swelling behavior investigation of hydrogel based on AAm and AA using CdS nanorods as photocatalyst initiator under different irradiations

Kazemi, Foad; Mohamadnia, Zahra; Kaboudin, Babak; Gharibi, Hussein; Ahmadinejad, Esmail; Taran, Zahra

doi:10.1016/j.jphotochem.2016.07.022

Cited by 19 publications

(10 citation statements)

References 24 publications

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“…The radiation processing has several advantages such as the simultaneous crosslinking and sterilization in one step and the easy control of physical properties of hydrogels by combining dose with polymer composition; it allows fabricating a pure and human-friendly product noncontaminated with ballast materials or the residuals of toxic initiators [30]. Irradiation technique was successfully reported by some researchers to synthesize superabsorbent hydrogels, some were using gamma-irradiation [24], [25], [30], [31], blue and green LED irradiations [32], microwave irradiation [26], and electron beam irradiation [33]. The aim of this research is to synthesize the superabsorbent hydrogel from chitosan and partially neutralized the acrylic acid by using the gamma-irradiation method.…”

Section: Introductionmentioning

confidence: 99%

Acrylic Acid Neutralization for Enhancing the Production of Grafted Chitosan Superabsorbent Hydrogel

Barleany¹,

Lestari²,

Yulvianti³

et al. 2017

International Journal on Advanced Science, Engineering and Information Technology

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Acrylic acid is a hydrophilic monomer which becomes the most popular material used to synthesize superabsorbent polymer. In this recent study, acrylic acid was partially neutralized with KOH and mixed with chitosan to form a superabsorbent hydrogel poly (acrylic acid)-graft-chitosan by using of gamma ray irradiation technique. The aim of this study was to determine the optimum composition of KOH in acrylic acid partial neutralization process for enhancing the production of grafted polymer. The degree of neutralization was varied (0, 25, 50, 75, and 100)% and the effect on the superabsorbent characteristics were studied. Hydrogel products were characterized by Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM). The gel content, swelling ratio, Equilibrium Degree of Swelling (EDS), and Thermal Analysis were also performed. The highest water swelling capacity was 715 (g water/g dry hydrogel), and the gel content was 91.23%, resulted from 75% of acrylic acid neutralization. The swelling capacity of the products was also tested in urea and NaCl solutions and reached 750 (g urea solution/g dry hydrogel) for urea and 378,33 (g NaCl solution/g dry hydrogel) for NaCl. The huge water absorption capacity indicated that the hydrogel from this research was a superabsorbent product which was suitable for hygiene products application. The degree of neutralization did not show a significant influence on the thermal resistance of the grafted hydrogel produced in this study.

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Section: Introductionmentioning

confidence: 99%

Acrylic Acid Neutralization for Enhancing the Production of Grafted Chitosan Superabsorbent Hydrogel

Barleany¹,

Lestari²,

Yulvianti³

et al. 2017

International Journal on Advanced Science, Engineering and Information Technology

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“…The PEI(1a) hydrogel is rapidly highly swellable and possesses pores that are much larger (10–20 μm diameter) than the bacterial size so that they do not easily clog. The PEI(1a) hydrogel becomes fully hydrated relatively quickly (in 15 min) as compared to the much slower swelling kinetics of many other hydrogels , which may take hours or even days to reach equilibrium swelling. The rapid swelling of these hydrogels is attributable to the hydrophilicity of both PEG and the star PEI polymer which has high density of protonated amines (−NH 3 + ), the low cross-link density of the hydrogel network, and the high porosity of the hydrogel.…”

Section: Discussionmentioning

confidence: 99%

Hydrogel Effects Rapid Biofilm Debridement with ex situ Contact-Kill to Eliminate Multidrug Resistant Bacteria in vivo

Yeo

Vikhe

et al. 2018

ACS Appl. Mater. Interfaces

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Multidrug resistance and the refractory character of bacterial biofilms are among the most difficult challenges in infection treatment. Current antimicrobial strategies typically are much more effective for prevention of biofilm formation than for eradication of established biofilms; these strategies also leave dead bacteria and endotoxin in the infection site, which impairs healing. We report a novel hydrogel that eradicates biofilm bacteria by non-leaching-based debridement followed by ex situ contact-killing (DESCK) away from the infection site. The debridement effect is likely due to the high water swellability and microporosity of the cross-linked network which is made from polyethylene glycol dimethacrylate tethered with a dangling polyethylenimine (PEI) star copolymer. The large pore size of the hydrogel makes the cationic pore walls highly accessible to bacteria. The hydrogel also degrades in the presence of infection cells, releasing star cationic PEI into the infection site to contact-kill bacteria remaining there. DESCK hydrogel effectively kills (>99.9% reduction) biofilms of methicillin-resistant Staphylococcus aureus (MRSA) and carbapenem-resistant Pseudomonas aeruginosa (CR-PA) and Acinetobacter baumannii in a murine excisional wound infection model. Silver-based wound dressings (controls) showed almost no killing of CR-PA and MRSA biofilms. This DESCK hydrogel greatly reduces the bioburden and inflammation and promotes wound healing. It has great potential for diverse infection treatment applications.

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“…For example, similar to organic photoinitiators, the polymerization of hydrogels with CdS as photoinitiators have shown that their concentration affects the swelling of the polymer. 69 However, due to the photocatalytic mechanism of action of the nanocrystals, which results in a unique radical initiation profile, further research is required to provide an in-depth understanding of the contribution of the photoinitiation and fillers roles on the final polymer properties. The above-mentioned early studies paved the way for the evolution of quantum photoinitiators.…”

Section: ■ Nanocrystal Photoinitiatorsmentioning

confidence: 99%

“…Notably, the effect of the nanocrystal concentration on the final polymer properties is not solely a factor of their role as fillers, but also a result of their action as photoinitiators. For example, similar to organic photoinitiators, the polymerization of hydrogels with CdS as photoinitiators have shown that their concentration affects the swelling of the polymer . However, due to the photocatalytic mechanism of action of the nanocrystals, which results in a unique radical initiation profile, further research is required to provide an in-depth understanding of the contribution of the photoinitiation and fillers roles on the final polymer properties.…”

Section: Nanocrystal Photoinitiatorsmentioning

confidence: 99%

Quantum Photoinitiators: Toward Emerging Photocuring Applications

2020

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Semiconductor nanocrystals are promising photocatalysts for a wide range of applications, ranging from alternative fuel generation to biomedical and environmental applications. This stems from their diverse properties, including flexible spectral tunability, stability, and photocatalytic efficiencies. Their functionality depends on the complex influence of multiple parameters, including their composition, dimensions, architecture, surface coating, and environmental conditions. A particularly promising direction for rapid adoption of these nanoparticles as photocatalysts is their ability to act as photoinitiators (PIs) for radical polymerization. Previous studies served to demonstrate the proof of concept for the use of quantum confined semiconductor nanocrystals as photoinitiators, coining the term Quantum PIs, and provided insights for their photocatalytic mechanism of action. However, these early reports suffered from low efficiencies while requiring purging with inert gases, use of additives, and irradiation by high light intensities with very long excitation durations, which limited their potential for real-life applications. The progress in nanocrystal syntheses and surface engineering has opened the way to the introduction of the next generation of Quantum PIs. Herein, we introduce the research area of nanocrystal photocatalysts, review their studies as Quantum PIs for radical polymerization, from suspension polymerization to novel printing, as well as in a new family of polymerization techniques, of reversible deactivation radical polymerization, and provide a forward-looking view for the challenges and prospects of this field.

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Synthesis, characterization and swelling behavior investigation of hydrogel based on AAm and AA using CdS nanorods as photocatalyst initiator under different irradiations

Cited by 19 publications

References 24 publications

Acrylic Acid Neutralization for Enhancing the Production of Grafted Chitosan Superabsorbent Hydrogel

Acrylic Acid Neutralization for Enhancing the Production of Grafted Chitosan Superabsorbent Hydrogel

Hydrogel Effects Rapid Biofilm Debridement with ex situ Contact-Kill to Eliminate Multidrug Resistant Bacteria in vivo

Quantum Photoinitiators: Toward Emerging Photocuring Applications

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