Synthesis and characterisation of a polyacrylamide–polyacrylic acid copolymer hydrogel for environmental analysis of Cu and Cd

Li, W; Zhao, Huijun; Teasdale, Peter R.; John, Richard; Zhang, Shanqing

doi:10.1016/s1381-5148(02)00055-x

Cited by 172 publications

(100 citation statements)

References 35 publications

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“…This result is also similar to that of Li who studied the pH response of a bulk PAM/PAA hydrogel. [53] IOH PAM or IOH PAM/PAA can also undergo mechanical pressure because of their robust structure. Under suitable pressure, they can exhibit different colors just as in E/W solutions (Fig.…”

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confidence: 99%

Multiresponsive Inverse‐Opal Hydrogels

et al. 2007

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Photonic crystals have been extensively studied over the last several years because of their potential applications in optical communication. Many methods, including templating methods, have been used to fabricate photonic crystals, of which colloidal crystals are especially important because they offer a wide range of easy ways to create various photonic crystals with opal or inverse-opal structure by selecting different infiltration methods, such as sol-gel processes, chemical vapor deposition (CVD), electrochemical processes, chemical bath deposition, and atomic layer deposition. At present, photonic crystals of various types of materials have been synthesized, including semiconductors, [1][2][3][4][5][6][7] metals, [8][9][10] polymers [11][12][13][14][15][16][17][18][19] and hydrogels. [20][21][22][23] Several assembling methods have been utilized for forming colloidal crystals, but the vertical deposition-evaporation method is most often reported because of its easy operation and inexpensive cost. [24][25][26][27][28][29] Recently, much attention has been paid to responsive photonic crystals (or sensitive photonic crystals) whose diffraction wavelength (location of the photonic bandgap, PBG) shifts as the external ambient is changed. Photonic crystals can exhibit brilliant color called structural color due to Bragg diffraction if the PBG is located in the visible-light region. The structural color depends on the PBG that is determined by the material and crystal lattice. Thus, a structure's color naturally offers a signal of the lattice structure of the photonic crystals for specific materials. Many polymer hydrogels can change volume reversibly in response to external conditions, such as solvent, [30,31] temperature, [32,33] pH and ionic strength, [34] and biomolecules. [35][36][37][38] This makes hydrogels excellent candidate materials for optically based sensors when they are coupled to an appropriate signal transduction mechanism, such as structure color or optical diffraction. Up to now, there are three types of responsive photonic crystals based on hydrogels. One is the pioneering work of Asher and co-workers who created functional periodic hydrogel structures through polymerization inside colloidal crystals, called polymerized colloidal crystal arrays (PCCAs).[20] They and other groups have demonstrated reversible diffraction shifts of PCCAs due to stimuli such as mechanical force, [20,39] metal ions, [21,22,40] pH and ionic strength, [23] and glucose. [22,41,42] Another type is opals from microgels such as poly(N-isopropylacrylamide) (PNIPAM) microgel. [43][44][45][46] These microgel opals displayed thermally induced shifts in optical diffraction due to lower critical solution temperature (LCST) behavior. The last one is inverse-opal hydrogel (IOH). Takeoka formed an IOH of PNIPAM that showed a reversible diffraction shift versus temperature. Lee synthesized mechanically robust IOH based on copolymers that exhibited optical diffraction sensitive to pH, ionic strength, and glucose. [47,48] Barry recen...

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confidence: 99%

Multiresponsive Inverse‐Opal Hydrogels

et al. 2007

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“…Functional groups within the polymeric matrix produce complex structures through hydrogen bonding, which finally binds metal ions and other environmental pollutants to the hydrogel's backbone. Methods derived to use acrylamide-co-acrylic acid hydrogel for the absorption of some textile dyes 1 and removal of traces of Cu and Cd from environmental water samples 9 have a good agreement in this regard. Two polymers with different properties form a stable combination state by interpenetrating networks, and a hydrogel obtained as a result of a combination of one polymer having hydrophilic and a second having nonionic functional groups possess salt resisting properties.…”

Section: Introductionmentioning

confidence: 97%

Synthesis of copolymeric acrylamide/potassium acrylate hydrogels blended with poly(vinyl alcohol): Effect of crosslinking and the amount of poly(vinyl alcohol) on swelling behavior

Ali

Zaidi

2005

J of Applied Polymer Sci

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ABSTRACT:A novel series of copolymeric acrylamide/ potassium acrylate superabsorbents, blended with poly(vinyl alcohol), have been synthesized by using N, NЈ-methylenebisacrylamide as a crosslinker and potassium persulphate (K 2 S 2 O 8 ) as an initiator. Swelling behavior of these hydrogels in water was investigated; and on the basis of swelling properties, the diffusional behavior of water into these hydrogel systems was analyzed. It was observed that with the increase of amount of poly(vinyl alcohol) or crosslinking, the swelling of the hydrogels decreased. The hydrogel synthesized by addition of 5% poly(vinyl alcohol) and 0.25% crosslinking showed maximum swelling of 54445%.

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“…Although a variety of methods are available for their removal, fast and effective means for their detection are still needed [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In a recent study, selective determination of copper ions in aqueous solutions utilizing aminodicarboxylic acid for the chelation of copper (II) ions was reported.…”

Section: Introductionmentioning

confidence: 99%

Polyvinylbenzyl Tris-Aminodicarboxylate Microspheres for the Optical Sensing of Cu<sup>2+</sup> Ions

Shakhsher¹,

Shqair²,

Qasim³

et al. 2014

AJAC

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In this work, a tris(2-aminoethyl)aminodicaboxylate functionality was substituted for the chloride of polyvinylbenzyl chloride (PVBC) which was lightly cross-linked (2%) with divinyl benzene. The resulting derivatized polymer microspheres were embedded in a hydrogel matrix of poly vinyl alcohol cross-linked with glutaraldehyde to produce a sensing membrane. The latter responded selectively to Cu 2+ solutions of different concentration ranges (1 × 10 −4 M to 1 × 10 −6 M). The response is based on the interaction between the metal cations and the negatively charged deprotonated dicarboxylate functional group, which led to neutralization of the charges. As a result, an increase in the turbidity of the sensing membrane occurred which is attributed to a change in the refractive index of the derivatized polymer microspheres relative to that of the hydrogel. The change in the turbidity of the sensing membrane was measured as absorbance using a conventional spectrophotometer. It was found that Cu 2+ ions bind to the aminodicarboxylated-polymer with a formation constant, K f , of 1 × 10 5 M −1 . SEM, Eds and IR analyses were performed on the aminodicarboxylated microspheres and their Cu 2+ complex.

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Synthesis and characterisation of a polyacrylamide–polyacrylic acid copolymer hydrogel for environmental analysis of Cu and Cd

Cited by 172 publications

References 35 publications

Multiresponsive Inverse‐Opal Hydrogels

Multiresponsive Inverse‐Opal Hydrogels

Synthesis of copolymeric acrylamide/potassium acrylate hydrogels blended with poly(vinyl alcohol): Effect of crosslinking and the amount of poly(vinyl alcohol) on swelling behavior

Polyvinylbenzyl Tris-Aminodicarboxylate Microspheres for the Optical Sensing of Cu<sup>2+</sup> Ions

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Synthesis and characterisation of a polyacrylamide–polyacrylic acid copolymer hydrogel for environmental analysis of Cu and Cd

Cited by 172 publications

References 35 publications

Multiresponsive Inverse‐Opal Hydrogels

Multiresponsive Inverse‐Opal Hydrogels

Synthesis of copolymeric acrylamide/potassium acrylate hydrogels blended with poly(vinyl alcohol): Effect of crosslinking and the amount of poly(vinyl alcohol) on swelling behavior

Polyvinylbenzyl Tris-Aminodicarboxylate Microspheres for the Optical Sensing of Cu&lt;sup&gt;2+&lt;/sup&gt; Ions

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Polyvinylbenzyl Tris-Aminodicarboxylate Microspheres for the Optical Sensing of Cu<sup>2+</sup> Ions