A greener route for smart PNIPAm microgel synthesis using a bio-based synthesis-solvent

Rana, Mohosin; Natale, Giovanniantonio; Siegler, Hector De la Hoz

doi:10.1016/j.eurpolymj.2022.111311

Cited by 8 publications

(4 citation statements)

References 52 publications

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“…The thickness of the gel layer can be tuned from 6.14 to 80.95 μm by controlling the loading amount of the NIPAm-MXene microgel, as shown in Figure S2 and Table S1. Additionally, the FTIR spectrum (Figure g) shows that the CC absorption peak at 1622 cm –1 of the PNIPAm-MXene/PAN-PNIPAm membrane disappeared compared with the PAN-NIPAm membrane, demonstrating the successful polymerization of NIPAm to PNIPAm. − There are hydrophilic and hydrophobic parts present in PNIPAm (Figure h).…”

Section: Resultsmentioning

confidence: 98%

Separation and Photodegradation of Dye-Containing Oil/Water Mixtures with a Photothermally Responsive PNIPAm-MXene/PAN-PNIPAm Nanofibrous Hydrogel Membrane

Huang,

Wen,

Huang

et al. 2024

ACS Appl. Nano Mater.

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Although several separation membranes for the purification of dye-containing oily wastewater have been reported, achieving continuous onestep separation and photodegradation of complex oil/water effluents containing dyes is still a significant challenge. In previous studies, the purification of oil/ water mixtures has typically involved a two-step process involving the initial separation of oil/water mixtures followed by the subsequent photodegradation of organic dyes. This is because one-step purification requires the membrane to concurrently possess an excellent separation efficiency and photodegradation ability to ensure efficient degradation of dyes as they rapidly pass through the separation membrane. Herein, we propose a photothermally responsive poly(Nisopropylacrylamide)-MXene/polyacrylonitrile-poly(N-isopropylacrylamide) nanofibrous hydrogel membrane (PNIPAm-MXene/PAN-PNIPAm, PMPP membrane). The PMPP membrane is composed of a PNIPAm-MXene hydrogel bonded to the surface of a PAN-PNIPAm nanofibrous membrane. The PNIPAm-MXene hydrogel layer imparts excellent photothermally responsive wettability, photodegradation activity, and antifouling properties to the membrane. The PAN-PNIPAm nanofibrous membrane provides a porous structure that ensures the highly efficient separation of complex oil/water mixtures. The PMPP membrane achieves simultaneous one-step separation and photodegradation of complex oil/water effluents under light irradiation, particularly in the case of multiphase heavy oil/water/light oil mixtures containing both oily and water-soluble organic dyes and oil−water emulsions. The degradation and separation efficiencies of the PMPP membrane exceed 99.5%. Even after 20 cycles, the degradation rates of Sudan IV and methyl blue (MB) remain above 95.7 and 99.9%, respectively.

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Section: Resultsmentioning

confidence: 98%

Separation and Photodegradation of Dye-Containing Oil/Water Mixtures with a Photothermally Responsive PNIPAm-MXene/PAN-PNIPAm Nanofibrous Hydrogel Membrane

Huang,

Wen,

Huang

et al. 2024

ACS Appl. Nano Mater.

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“…The XRD spectrum showed the characteristic peak of PNIPAM at 20.4 for 2θ in MWCNT‐g‐PNIPAM, proving the successful synthesis of MWCNT‐g‐PNIPAM (Figure S7a , Supporting Information ) . [ 54 ] The functional groups of MWCNT‐g‐PNIPAM were analyzed by FTIR (Figure S7b , Supporting Information). The characteristic peaks of MWCNT‐g‐PNIPAM at 1460, 1550, and 1645 cm −1 were attributed to the C─H bending vibration of the isopropyl group and the N─H stretching vibration of the amide group in PNIPAM, respectively.…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Solar Evaporator with Adjustable Island Structure Improves Performance and Salt Discharge Capacity of Desalination

Wu,

Cui,

et al. 2023

Advanced Science

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Interfacial solar steam generation (ISSG) is the main method to get fresh water from seawater or wastewater. The balance between evaporation rate and salt resistance is still a major challenge for ISSG. Herein, a wood aerogel island solar evaporator (WAISE) with tunable surface structure and wettability by synthesizing poly(n‐isopropylacrylamide)‐modified multi‐walled carbon nanotube photothermal layers. Compared to dense surface structure evaporators, interfacial moisture transport, thermal localization, and surface water vapor diffusion of WAISE are greatly promoted, and the evaporation rate of WAISE increased by 87.64%. WAISE allows for record performance of 200 h continuous operation in 20% NaCl solution without salt accumulation. In addition, the photo‐thermal‐electric device is developed based on WAISE with continuous water purification, power generation, and irrigation functions. This work provides a new direction for the development of multifunctional water purification systems.

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“…As interest towards NGs continues to grow, especially in the biomedical field, issues around the use of organic solvents and sustainability of the process are becoming prominent. Studies of the effects of changing the solvent system include the synthesis of core-shell nano/microgels with polyethylene glycol chains using surfactant free emulsion polymerization in water 36 , the impact of changing water-to-ethanol ratio in a cosolvent system 37 , using biobased synthesis-solvents 38 , effect of solvents on the swelling ability of bulk hydrogels 39 .…”

Section: Introductionmentioning

confidence: 99%

Sustainable and Surfactant-Free Synthesis of Negatively Charged Acrylamide Nanogels for Biomedical Applications

Mazzali,

Rath,

Röntgen

et al. 2024

Preprint

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Nanogels offer unique advantages, like high surface-to-volume ratio, scalable synthetic methods and easily tailored formulations, that allow to control size and introduce stimuli-responsive properties. Their potential for drug delivery is significant due to their biocompatibility, high drug loading capacity, and controlled and sustained drug release, but the development of greener and sustainable processes, in particular the replacement of organic solvents with water, is essential for large-scale applications. Here we report our results on the synthesis in water of covalently crosslinked acrylamide-based nanogels, both neutral and negatively charged, with varying amounts of acryloyl-L-proline, using a high-dilution radical polymerization technique without the need for surfactants. The use of a water-based synthesis resulted in nanogels with high monomer conversions and chemical yields, as well as lower polydispersity and smaller particle sizes for the negatively charged nanogels. This results in a more efficient synthetic methodology, with reduced loss of starting materials, higher potential for scalability and reduction in costs. The suitability of these nanogels for biomedical applications was supported by cytotoxicity studies showing no significant reduction in viability on a human neuroblastoma cell line.

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A greener route for smart PNIPAm microgel synthesis using a bio-based synthesis-solvent

Cited by 8 publications

References 52 publications

Separation and Photodegradation of Dye-Containing Oil/Water Mixtures with a Photothermally Responsive PNIPAm-MXene/PAN-PNIPAm Nanofibrous Hydrogel Membrane

Separation and Photodegradation of Dye-Containing Oil/Water Mixtures with a Photothermally Responsive PNIPAm-MXene/PAN-PNIPAm Nanofibrous Hydrogel Membrane

Multifunctional Solar Evaporator with Adjustable Island Structure Improves Performance and Salt Discharge Capacity of Desalination

Sustainable and Surfactant-Free Synthesis of Negatively Charged Acrylamide Nanogels for Biomedical Applications

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