Preparation of macroporous poly(N-isopropylacrylamide) hydrogels using a suspension–gelation method

Sato, Ryuichi; Noma, Ryoko; Tokuyama, Hideaki

doi:10.1016/j.eurpolymj.2015.01.051

Cited by 14 publications

(6 citation statements)

References 33 publications

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“…Interior morphology of synthesized hydrogels can be examined by the cross-sectional SEM analysis. For example, in the paper by Sato et al [15], the surface of macroporous hydrogels in the form of less than 1 mm sliced was analyzed using a stereomicroscope. As for the SEM analysis, the swollen samples were freeze-dried to avoid shrinkage in the drying process and frozen using liquid nitrogen.…”

Section: Methods Of Hydrogels Investigationmentioning

confidence: 99%

“…In the case of the block polymerization to the liquid monomer, an initiator is added directly and the obtained hydrogels are characterized by inherent weak structure therefore they are frequently grafted. The suspension-gelation method (microcapsule templating method) was also described to prepare macroporous polymeric hydrogels [15]. An aqueous suspension is formed by dispersing the microcapsules as a pore template (porogen) into a pre-gel aqueous solution containing monomers and cross-linking monomers.…”

Section: Hydrogels Preparationmentioning

confidence: 99%

See 1 more Smart Citation

Hydrogels from Fundaments to Application

Kołodyńska¹,

Skiba²,

Górecka³

et al. 2016

Emerging Concepts in Analysis and Applications of Hydrogels

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Polymer superabsorbents commonly known as hydrogels are cross-linked highly molecular compounds able to absorb water from physicochemical fluids in the amounts from 10-fold to 100-fold larger than their dry mass. Numerous investigations have shown that they can help reduce irrigation water consumption, lower the death rate of plants, improve fertilizer retention in soil and increase plant growth rate. Besides water absorption and retention, the superabsorbent polymers have many advantages over conventional ones, such as a sustained supply of nutrition to plants for a longer time, thus increasing the phosphate fertilizer use efficiency and decreasing application frequency. The aim of this study is to investigate the influence of chemical conditions on hydrogels, kinetic and absorption behaviour towards metal ions in the presence of the chelating agent of a new generation. In this group, there are IDS, EDDS, GLDA, MGDA, etc. In the chapter, the research on the applicability of the effective absorption of metal complexes with a biodegradable complexing agent will be presented. The possibility of the preparation of slow-release fertilizers of controlled activity of a new generation in such system will also be discussed.

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Section: Methods Of Hydrogels Investigationmentioning

confidence: 99%

Section: Hydrogels Preparationmentioning

confidence: 99%

Hydrogels from Fundaments to Application

Kołodyńska¹,

Skiba²,

Górecka³

et al. 2016

Emerging Concepts in Analysis and Applications of Hydrogels

View full text Add to dashboard Cite

show abstract

“…[96] In addition, this process produces macroporous polymeric hydrogels. [97] The photo-polymerization process facilitates the in situ preparation of cross-linked hydrogel networks. In this approach, free-radical polymerization is carried out by an initiator and broad-spectrum light irradiation spanning ultraviolet (UV) and visible to infrared wavelengths.…”

Section: Chemical Cross-linkingmentioning

confidence: 99%

Hydrogel Nanocomposite Adsorbents and Photocatalysts for Sustainable Water Purification

Kumar

Gusain

Pandey

et al. 2022

Adv Materials Inter

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Anthropogenic actions, environmental catastrophes, urbanization, population growth, and industrialization generate toxic pollutants in water bodies. The most pollutants are heavy metals and metalloids, dyes, volatile organic compounds, pharmaceuticals, pesticides, radionuclides, aromatic hydrocarbons, oils, polycyclic aromatic hydrocarbons, microbes/pathogens, and microplastics that can be in different forms and concentrations. [3][4][5] Globally, approximately 2 million tons of pollutants from agriculture, industrial, and sewage waste are released into water streams, which pose severe health risks and cause the deaths of more than 1400 people every day. [6] Thus, developing efficient, economical, environmentalfriendly, and scalable technologies for the purification of wastewater and seawater is urgently required. To fulfill the shortage of clean water, affordable technologies can be used to transform unconventional water reserves (such as wastewater, rainfall, seawater, and brackish water) into potable water. Recently, numerous water treatment technologies, including coagulation/flocculation, filtration, chemical precipitation, aerobic/anaerobic processing, biological treatment, electrochemically precipitation, advanced oxidation processing, membrane separation, ion-exchange, adsorption, solar/thermal distillation/evaporation, crystallization, and photocatalysis, have emerged to offer practical solutions to water pollution management. [7][8][9][10][11][12][13][14] Among them, adsorption and photocatalysis technologies have garnered significant attention from the research community due to their cost-effectiveness, high performance, Hydrogels have been employed for water purification applications, but their performance and strength are unsatisfactory for widespread adoption. Recently, hydrogel nanocomposites have been proposed to resolve the inherent challenges faced by hydrogels for water treatment. This review comprehensively analyzes hydrogel nanocomposites for water treatment using adsorbent and photocatalysis techniques. The structure, classification, and tunable synthesis methods of hydrogels are explained. Further, how hydrogels can be incorporated with functional nanoparticles (NPs) and can be used as templates/precursors for developing advanced 3D architectures, including the formation of hydrogel nanocomposite beads and 3D printing objects are discussed. Finally, the structure-property relationships of hydrogel nanocomposites are critically reviewed by considering introductory gelation chemistry, such as swelling characteristics, mechanical properties, stimuli-responsiveness, and ionic/electronic conduction. The extensive cross-linking of polymer chains with NPs offers high mass/charge transport, high surface areas, and enhanced polymer-water interactions to achieve high-performing adsorbents and photocatalysts. Several motivating examples of emerging NP-containing hydrogel nanocomposites for use in adsorbents and photocatalysis have been discussed. Such efforts validated the excellent technological pote...

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“…Tokuyama et al. [ 15 ] introduced sodium alginate microcapsules as a pore template to prepare microporous PNIPAM hydrogels by a suspension–gelation method and the swelling balance time of composite hydrogels can be shortened to a few minutes. Additionally, the porosity of hydrogels can be increased by adding Polyethylene glycol (PEG) and other porogens.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14] Therefore, changing the size and arrangement of micropores inside the hydrogel is beneficial for reducing the resistance encountered during the mass transfer process and thus improving the diffusion rate of the solvent. Tokuyama et al [15] introduced sodium alginate microcapsules as a pore template to prepare microporous PNIPAM hydrogels by a suspension-gelation method and the swelling balance time of composite hydrogels can be shortened to a few minutes. Additionally, the porosity of hydrogels can be increased by adding Polyethylene glycol (PEG) and other porogens.…”

Section: Introductionmentioning

confidence: 99%

Bio‐Inspired Stimuli‐Responsive Ti₃C₂T_x/PNIPAM Anisotropic Hydrogels for High‐Performance Actuators

Yan

Ding

Zheng

et al. 2023

Adv Funct Materials

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Near‐infrared (NIR) light‐responsive hydrogels have the advantages of high precision, remote control and excellent biocompatibility, which are widely used in soft biomimetic actuators. The process by which water molecules diffuse can directly affect the deformation of hydrogel. Therefore, it remains a serious challenge to improve the response speed of hydrogel actuator. Herein, an anisotropic photo‐responsive conductive hydrogel is designed by a directional freezing method. Due to the anisotropy of the MXene‐based PNIPAM/MXene directional (PMD) hydrogel, its mechanical properties and conductivity are enhanced in a specific direction. At the same time, with the presence of the internal directional channels and the assistance of capillary force, the PMD hydrogel can achieve a volume deswelling of 70% in 2 s under light irradiation, further building a hydrogel actuator with a fast response performance. Additionally, the hydrogel actuator can lift an object 40 times its weight by a distance of 6 mm, realizing the advantages of both rapid responsiveness and high driving strength, which makes the hydrogel actuator have important application significance in remote control, microflow valve, and soft robot.

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Preparation of macroporous poly(N-isopropylacrylamide) hydrogels using a suspension–gelation method

Cited by 14 publications

References 33 publications

Hydrogels from Fundaments to Application

Hydrogels from Fundaments to Application

Hydrogel Nanocomposite Adsorbents and Photocatalysts for Sustainable Water Purification

Bio‐Inspired Stimuli‐Responsive Ti₃C₂T_x/PNIPAM Anisotropic Hydrogels for High‐Performance Actuators

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Preparation of macroporous poly(N-isopropylacrylamide) hydrogels using a suspension–gelation method

Cited by 14 publications

References 33 publications

Hydrogels from Fundaments to Application

Hydrogels from Fundaments to Application

Hydrogel Nanocomposite Adsorbents and Photocatalysts for Sustainable Water Purification

Bio‐Inspired Stimuli‐Responsive Ti3C2Tx/PNIPAM Anisotropic Hydrogels for High‐Performance Actuators

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Product

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About

Bio‐Inspired Stimuli‐Responsive Ti₃C₂T_x/PNIPAM Anisotropic Hydrogels for High‐Performance Actuators