Compression strength and deformation of gellan gels formed with mono- and divalent cations

Tang, Juming; Tung, Marvin A.; Zeng, Yanyin

doi:10.1016/0144-8617(95)00124-7

Cited by 118 publications

(84 citation statements)

References 6 publications

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“…Experimental results show that with the addition of NaCl to the gelant solution, the gelation time decreased and the gel strength increased. This is due to the compression of electrical double layers of polymers with added inorganic salts and the decrease in repulsion forces between the charged groups which allows the reactions to occur more easily Tang et al 1996). Experimental results also show that the gel has a strong salt tolerance in high salinity reservoirs.…”

Section: Effect Of Salt Concentrationmentioning

confidence: 51%

Synthesis, characterization and evaluation of polyacrylamide graft starch/clay nanocomposite hydrogel system for enhanced oil recovery

Singh

Mahto

2017

Pet. Sci.

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In this paper the suitability of a graft polymer nanocomposite hydrogel system for enhanced oil recovery was examined using polyacrylamide graft starch/clay nanocomposite (a laboratory synthesized product) and chromium (III) acetate (crosslinker). X-ray diffraction analysis, Fourier transform infrared spectrometry analysis, field-emission scanning electron microscopy and transmission electron microscopy were carried out to reveal the laboratory synthesized product as a nanocomposite. The effects of various parameters like salt concentration, pH, temperature, polymer concentration and crosslinker concentration on the properties of the developed gel system were systematically evaluated. The thermal stability of the nanocomposite gel and the conventional gel system were also determined by thermogravimetric analysis. The graft polymer nanocomposite gel system exhibited acceptable gel strength, gelation time and gel stability compared with the conventional gel system. The nanocomposite gels prepared using a low crosslinker concentration showed higher gel strength and required longer gelation time than the conventional gel which is more desirable properties for the effective placement of gel during enhanced oil recovery operations. In addition, sand pack flooding experiments show that the graft polymer nanocomposite gels had better plugging capacity than the conventional gel systems under reservoir conditions. Hence, this gel system may be suitable in the water shutoff treatments required for enhanced oil recovery from oilfields.

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Section: Effect Of Salt Concentrationmentioning

confidence: 51%

Synthesis, characterization and evaluation of polyacrylamide graft starch/clay nanocomposite hydrogel system for enhanced oil recovery

Singh

Mahto

2017

Pet. Sci.

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“…A further attractive characteristic of GG for TE are the 60 mechanical similarity to the elastic moduli of common tissue. The mechanical characteristics of GG depend on type (LAGG or HAGG) and concentration as well as the type and amount of physical cross-linker 57 . Other strategies involve methacrylation of the GG chain (Fig.…”

Section: Why Consider Gellan Gum?mentioning

confidence: 99%

Modified gellan gum hydrogels for tissue engineering applications

et al. 2013

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Gellan gum is an anionic linear polysaccharide well known for its use as a multi-functional gelling, stabilising and suspending agent in a variety of foods and personal care products. In this Highlight, we explore the recently established directions for gellan gum hydrogels as materials for applications in tissue engineering. We highlight that modified gellan gum will be well suited for this purpose, providing that a number of remaining challenges are addressed. Gellan gum is an anionic linear polysaccharide well known for its use as a multi-functional gelling, 5 stabilising and suspending agent in a variety of foods and personal care products. In this Highlight, we explore the recently established directions for gellan gum hydrogels as materials for applications in tissue engineering. We highlight that modified gellan gum will be well suited for this purpose, providing that a number of remaining challenges are addressed.

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“…Além disso, o tempo necessário para o cruzamento de G' e G" aumenta com o decréscimo da concentração. Comportamento similar foi encontrado para outros biopolímeros [22,23] como por exemplo o sistema pectina de baixo grau de metoxilação/cálcio [24] . A Figura 3 mostra que o tempo de transição de fase sol-gel, t g , diminui com o aumento de concentração de pectina, o que está de acordo com dados reportados na literatura [18] .…”

Section: Resultsunclassified

Influência de fatores estruturais no processo de gelificação de pectinas de alto grau de metoxilação

Brandão

Andrade

1999

Polímeros

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RESUMO: Duas amostras de pectina de alto grau de metoxilação, amostras A e B, foram purificadas, levando-se em conta os teores em grupos metoxílicos. Sua caracterização estrutural foi realizada através de dosagem de açúcares neutros com auxílio de cromatografia gasosa, GLC, e determinação do grau de metoxilação por técnicas de cromatografia líquida de alta resolução, HPLC. A amostra A apresentou teores mais elevados em açúcares neutros totais e grau de metoxilação mais alto. As viscosidades intrínsecas, [eta] = 3,68 dL/g e [eta] = 3,56 dL/g foram determinadas a pH 7,0 para as amostras A e B, respectivamente. A pH 3,0, valores menores foram obtidos. A gelificação das amostras foi investigada, em função da concentração e da temperatura, medindo-se os módulos de armazenamento, G', e de perda, G", em função do tempo. A pH 3,0 a pectina A apresentou taxas de gelificação mais elevadas, tanto em função da concentração como da temperatura.

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Compression strength and deformation of gellan gels formed with mono- and divalent cations

Cited by 118 publications

References 6 publications

Synthesis, characterization and evaluation of polyacrylamide graft starch/clay nanocomposite hydrogel system for enhanced oil recovery

Synthesis, characterization and evaluation of polyacrylamide graft starch/clay nanocomposite hydrogel system for enhanced oil recovery

Modified gellan gum hydrogels for tissue engineering applications

Influência de fatores estruturais no processo de gelificação de pectinas de alto grau de metoxilação

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