Synthesis of thermo- and pH-responsive Ag nanoparticle-embedded hybrid microgels and their catalytic activity in methylene blue reduction

Tang, Yecang; Wu, Ting; Hu, Botao; Yang, Qian; Liu, Li; Yu, Bo; Ding, Yi; Ye, Shiyong

doi:10.1016/j.matchemphys.2014.10.045

Cited by 81 publications

(38 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, the cationic charges of the DMAEMA groups repel each other and thus force the polymer chains to extend more within the microgel, also causing the microgel to swell. This has been observed previously for DMAEMA‐containing microgels and macrogels . Note that the size of the microgels at very acidic pH was reduced as a result of the increased ionic strength due to the greater HCl concentration, as has been observed in DMAEMA‐containing macrogels …”

Section: Resultssupporting

confidence: 82%

“…In this study, we aimed to fabricate cationic microgels, specifically containing hydrophilic 2‐(dimethylamino)ethyl methacrylate (DMAEMA), as DMAEMA‐based polymers are pH and thermoresponsive and have been used in drug and gene delivery . DMAEMA‐containing microgels have been synthesized previously using conventional methodologies, but none were amphiphilic or were prepared on a lab‐on‐a‐chip . In several studies, DMAEMA was combined with N ‐isopropylacrylamide (NIPAM) to produce dual thermoresponsive microgels, or with other hydrophilic monomers or polymers .…”

Section: Introductionmentioning

confidence: 99%

“…DMAEMA‐containing microgels have been synthesized previously using conventional methodologies, but none were amphiphilic or were prepared on a lab‐on‐a‐chip . In several studies, DMAEMA was combined with N ‐isopropylacrylamide (NIPAM) to produce dual thermoresponsive microgels, or with other hydrophilic monomers or polymers . Thus, to the best of our knowledge, this is the first time that amphiphilic, cationic, DMAEMA‐containing microgels have been fabricated, made possible via the use of a microfluidic platform.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fabrication of tailorable pH responsive cationic amphiphilic microgels on a microfluidic device for drug release

Tarn

Pamme

et al. 2017

J. Polym. Sci. Part A: Polym. Chem.

View full text Add to dashboard Cite

Cationic, amphiphilic microgels of differing compositions based on hydrophilic, pH, and thermoresponsive 2-(dimethylamino)ethyl methacrylate (DMAEMA) and hydrophobic, nonionic n-butyl acrylate (BuA) are synthesized using a lab-on-a-chip device. Hydrophobic oil-in-water (o/w) droplets are generated via a microfluidic platform, with the dispersed (droplet) phase containing the DMAEMA and BuA, alongside the hydrophobic cross-linker, ethylene glycol dimethacrylate, and a free radical initiator in an organic solvent. Finally, the hydrophobic droplets are photopolymerized via a UV light source as they traverse the microfluidic channel to produce the cationic amphiphilic microgels. This platform enables the rapid, automated, and in situ production of amphiphilic microgels, which do not match the core-shell structure of conventionally prepared microgels but are instead based on random amphiphilic copolymers of DMAEMA and BuA between the hydrophobic cross-links. The microgels are characterized in terms of their swelling and encapsulation abilities, which are found to be influenced by both the pH response and the hydrophobic content of the microgels.

show abstract

Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of tailorable pH responsive cationic amphiphilic microgels on a microfluidic device for drug release

Tarn

Pamme

et al. 2017

J. Polym. Sci. Part A: Polym. Chem.

View full text Add to dashboard Cite

show abstract

“…The beauty of these materials is its smart behavior; that is, we can tune the properties of metal nanoparticles by changing the properties of polymer network with external stimuli before or during the process of reduction, e.g., temperature [22][23][24], pH [25][26][27], ionic strength [28,29]. In current years, many investigators have a great interest in the field of stimulus-responsive composite systems composed of continuous organic and dispersed inorganic phase [30] for different applications, e.g., drug delivery [31][32][33], sensors [34,35], electrical [36], catalysis [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Ag-loaded thermo-sensitive composite microgels for enhanced catalytic reduction of methylene blue

Shah

Sayed

Fayaz

et al. 2017

Nanotechnol. Environ. Eng.

View full text Add to dashboard Cite

In this work, we report the synthesis of composite system pNAC, composed of silver nanoparticles embedded in pure thermo-sensitive crosslinked polymer network of poly(N-isopropylacrylamide-co-acrylamide) (pNA), using as a catalyst for the reduction of methylene blue (MB) dye by sodium borohydride (NaBH 4 ). The pNA was prepared by conventional free radical polymerization technique using sodium dodecyl sulfate as stabilizing agent, followed by in situ reduction of AgNO 3 inside the polymer network by NaBH 4 for the synthesis of composite systems pNACs. The synthesized pNA and pNACs were characterized by FTIR, dynamic light scattering, thermogravimetric analysis, scanning electron microscopy and UV-visible spectroscopy techniques. The materials were found sensitive toward temperature change of the medium. The entrapment ability of pNA toward different amounts of AgNO 3 solution was studied, and effect of metal content on particle size of pNACs was analyzed. The pNACs were applied as a catalyst for the reduction of MB in which they exhibit high catalytic activity and reusability toward the reaction.

show abstract

“…Therefore, Ag NPs containing hybrid microgels have gained much attention as potential catalysts for various organic reactions [23,26,32]. Tang et al [33] reported temperature and pH tunable catalytic activity of Ag NPs fabricated poly(N-isopropylacrylamide-co-2-(dimethylamino) ethyl methacrylate) [p(NIPAM-DMA)] hybrid microgels for degradation of methylene blue in an aqueous medium. Sahiner et al [34] reported catalytic activity of Co NPs fabricated poly(2-acrylamido-2-methyl-1-propene sulfonic acid) hybrid microgels for reduction of nitroarenes under various conditions of hybrid microgel dose, temperature and NaBH 4 concentration.…”

Section: Introductionmentioning

confidence: 99%

Engineering of silver nanoparticle fabricated poly (N-isopropylacrylamide-co-acrylic acid) microgels for rapid catalytic reduction of nitrobenzene

Farooqi

Naseem

Ijaz

et al. 2015

Journal of Polymer Engineering

View full text Add to dashboard Cite

Abstract Three different poly(N-isopropylacrylamide-co-acrylic acid) [p(NIPAM-AA)] microgel samples were prepared using a precipitation polymerization method by varying the concentration of NIPAM and AA in aqueous medium. The microgels were used as microreactors to fabricate Ag nanoparticles (NPs) by in situ a reduction method. Fourier transform infrared (FTIR) and UV-visible spectroscopy were used to characterize the pure and hybrid microgels. The hybrid microgels with different AA content were used as catalysts for reduction of nitrobenzene (NB) into aniline. The progress of the reaction was monitored by a UV-visible spectrophotometer. The results show that the value of the apparent rate constant for catalytic reduction of NB decreases from 0.431 min-1 to 0.227 min-1 by increasing AA content from 3 mol% to 7 mol%, respectively. Decrease in apparent rate constant with increase of AA content can be attributed to an increase in hydrophilicity with increase of AA contents of the microgels. The increase in induction period with increase of AA contents indicates that diffusion of NB towards the catalytic surface becomes difficult due to an increase of hydrophilicity.

show abstract

Synthesis of thermo- and pH-responsive Ag nanoparticle-embedded hybrid microgels and their catalytic activity in methylene blue reduction

Cited by 81 publications

References 50 publications

Fabrication of tailorable pH responsive cationic amphiphilic microgels on a microfluidic device for drug release

Fabrication of tailorable pH responsive cationic amphiphilic microgels on a microfluidic device for drug release

Ag-loaded thermo-sensitive composite microgels for enhanced catalytic reduction of methylene blue

Engineering of silver nanoparticle fabricated poly (N-isopropylacrylamide-co-acrylic acid) microgels for rapid catalytic reduction of nitrobenzene

Contact Info

Product

Resources

About