High clay content nanocomposite hydrogels with surprising mechanical strength and interesting deswelling kinetics

Liu, Yang; Zhu, Meifang; Liu, Xiaoli; Zhang, Wei; Sun, Bin; Chen, Yanmo; Adler, Hans‐Juergen P.

doi:10.1016/j.polymer.2005.11.030

Cited by 213 publications

(148 citation statements)

References 28 publications

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“…[28,29] The toughness enhancement of hydrogels by the ferritin was verified experimentally in Figure 2a, and this reinforcement induced the reduction in creep of the hydrogel actuator. When the PVA/ferritin hydrogel was exposed to a pH 9 solution, the protein shell of the ferritin that connects the ferritin core to the PVA matrix prevents the separation of the core and PVA chains.…”

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confidence: 72%

Nanocomposite Hydrogel with High Toughness for Bioactuators

et al. 2009

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Ferritin‐based nanofibrous hydrogels that demonstrate synergy between the ferritin protein and the synthetic polymer matrix are fabricated. The hybrid hydrogels showed enhanced mechanical properties and repeated expansion and contraction without showing severe creep during pH switching. The ferritin nanoparticles incorporated into the hydrogel nanofibers improved the actuation stability of a hydrogel actuator by acting as elastic nanosprings in a nanoscale polymer.

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confidence: 72%

Nanocomposite Hydrogel with High Toughness for Bioactuators

et al. 2009

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“…Such nanocomposite hydrogels are attractive for a wide range of applications. 6,7 With regard to the characterization of the microstructure of hydrogels, scattering methods such as light scattering, smallangle X-ray scattering (SAXS), and small-angle neutron scattering (SANS) were used in the past two decades. [8][9][10][11] It was shown that the scattering intensity from polymer gels is always larger than that from the solution of the same polymer at the same concentration.…”

Section: Introductionmentioning

confidence: 99%

Polyacrylamide−Clay Nanocomposite Hydrogels: Rheological and Light Scattering Characterization

2007

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The free-radical polymerization of acrylamide in aqueous clay dispersions and the structure of the resulting polymer-clay nanocomposite hydrogels have been investigated by rheometry using oscillatory deformation tests. Laponite was used as clay particles in the hydrogel preparation. The reactions were carried out with and without the presence of the chemical cross-linker N,N′-methylenebis(acrylamide) (BAAm). In the absence of BAAm, increasing clay concentration from 0.2 to 7% results in 3 orders of magnitude increase of the elastic modulus G′ of the hydrogels. At a clay concentration of 5% or above, all the reaction systems, with or without BAAm, exhibit similar elastic moduli, indicating that clay mainly determines the rubber elasticity of the hydrogels. The loss factor tan δ was found to be around 0.1, indicating that the nanocomposite hydrogels are much more viscous than the conventional hydrogels. Increasing the amount of clay also increases the viscous, energy dissipating properties of the nanocomposite hydrogels, which are responsible for their improved mechanical properties. Dynamics of the nanocomposite hydrogels was also investigated by dynamic light scattering. The ensembleaveraged scattered intensity of the hydrogels varies nonmonotonically with the clay concentration due to the action of clay both as a cross-linker and as an ionic component during the formation of the nanocomposite hydrogels.

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“…Generally, this study gives oil producers a view on the synthesis and swelling behavior of PPGs in high-salinity water (formation water). Knowing how much PPG is required to be injected into the reservoir in order to efficiently control unwanted water production is a vital information for oil producers (Bai et al 2008;Liu et al 2006); therefore, the results of this study are useful for oil producers.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of an efficient copolymer of acrylamide and acrylic acid and determination of its swelling behavior

Heidari

Esmaeilzadeh

Mowla

et al. 2018

J Petrol Explor Prod Technol

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The main purpose of this work is to prepare an efficient series of preformed particle gels (PPGs) and to study their behaviors to control unwanted water in oil fields. To this end, 12 copolymer samples composed of acrylamide and acrylic acid [poly(AAm-co-AA)] with different AAm/AA mole ratios and various mole percentages of N,N′-methylenebisacrylamide (MBA) were synthesized by a free radical copolymerization method. The gelation time of each sample was measured. The samples were dried in three consecutive steps: drying at atmospheric condition, drying in the oven, and drying in the vacuum oven, respectively. The chemical structure and morphology of the prepared PPGs were studied by a Fourier transform infrared spectroscopy and a scanning electron microscopy, respectively. Additionally, the swelling percentage of PPG samples was examined in different types of salt water (MgCl 2 ·6H 2 O, CaCl 2 ·2H 2 O, BaCl 2 ·2H 2 O, NaCl, KCl, and LiCl) with 200,000 ppm concentration and pH in the range of 3-8. Our results showed that the synthesized PPGs had swelling percentage (S%) in the range of 2-1300% for different types of salt solution. Moreover, the results confirmed that the swelling amount of PPG samples has a parabolic behavior against mole ratio of AAm/AA and decreases with increasing mole percentage of MBA.

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High clay content nanocomposite hydrogels with surprising mechanical strength and interesting deswelling kinetics

Cited by 213 publications

References 28 publications

Nanocomposite Hydrogel with High Toughness for Bioactuators

Nanocomposite Hydrogel with High Toughness for Bioactuators

Polyacrylamide−Clay Nanocomposite Hydrogels: Rheological and Light Scattering Characterization

Synthesis of an efficient copolymer of acrylamide and acrylic acid and determination of its swelling behavior

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