Effect of temperature and pH on swelling behavior of hydroxyethyl cellullose-acrylamide hydrogel

Alonso, J Gabriel; Luis, José; Rivera, Angel; Urueta, J.

doi:10.1515/epoly.2007.7.1.1744

Cited by 13 publications

(10 citation statements)

References 7 publications

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“…10, the swelling behaviour of the poly (acrylamide-co-acrylic acid) potassium salt and sodium acrylate typically demonstrate maximum swelling between pH 6.5 (neutral medium) and 9 after free swelling at 25 °C for 2-, 4-and 6-h. This observation is in agreement with Lenji et al [25] and Alonso et al [21] who also observe that the optimal range for the hydrogels was at a temperature of about 30 °C, between pH 7 and 9. Figure 10a-c reflects the transient behaviour of the SPHs, with the highest swelling performance being observed at pH 9 after 2 h of free swelling.…”

Section: Effect Of Phsupporting

confidence: 92%

“…Different investigators have reported the optimal temperatures for different hydrogel samples tested. For example, Singh and Dhaliwal [18] have reported 50 °C and Alonso et al [21] have reported 30 °C; the optimal temperature range of the hydrogels in this study was evaluated to be between 50 and 75 °C.…”

Section: Effect Of Temperaturementioning

confidence: 96%

“…Al-Anbakey [20] and Alonso et al [21] investigated the effect of pH and temperature on the swelling performance of different hydrogels and both agreed that the pH of the activation fluid is a strong determinant of their swelling performance. Meanwhile, Alonso et al [21] reported the thermal response of the hydrogels tested and stated that the hydrogels were sensitive to the temperature condition with the highest swelling capacity found at pH 7 at 30 °C. Similar investigations for pH sensitivity were carried out by Kim et al [4] with mechanical properties included in the analysis.…”

Section: Electricalmentioning

confidence: 99%

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Swelling performance of sodium polyacrylate and poly(acrylamide-co-acrylic acid) potassium salt

et al. 2019

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The application of superabsorbent polymer hydrogels in the oil and gas industry for reservoir and well management is gaining more traction. In this study, the swelling performance and adsorption kinetics of two commercial superabsorbent polymer hydrogels-poly(acrylamide-co-acrylic acid) potassium salt and sodium polyacrylate-were evaluated based upon their stimuli response to pH and salinity at varying temperature and reaction time periods. Characterisation and evaluation of the materials were performed using analytical techniques-optical microscopy, scanning electron microscopy, thermal gravimetric analysis and the gravimetric method. Experimental results show that reaction conditions strongly influence the swelling performance of the superabsorbent polymer hydrogels considered in this study. Generally, increasing pH and salinity concentration led to a significant decline in the swelling performance of both superabsorbent polymer hydrogels. An optimal temperature range between 50 and 75 °C was considered appropriate based on swell tests performed between 25 c to 100 °C over 2-, 4-and 6-h time periods. These findings serve as a guideline for field engineers in the use of superabsorbent polymer hydrogels for a wide range of oilfield applications. The study results provide evidence that the two superabsorbent polymer hydrogels can be used for petroleum fraction-saline water emulsions separation, reservoir zonal isolation, water shutoff and cement plugging applications.

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Section: Effect Of Phsupporting

confidence: 92%

Section: Effect Of Temperaturementioning

confidence: 96%

Section: Electricalmentioning

confidence: 99%

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Swelling performance of sodium polyacrylate and poly(acrylamide-co-acrylic acid) potassium salt

et al. 2019

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“…The synthesis of HEC/PAAm has been previously studied by Alonso et al [7], by means of free radicals using potassium persulfate (KPS), demonstrating the dependence of pH and temperature on the swelling of gels. The gels showed a maximum swelling of 1200 wt%, at a temperature of 30°C, decreasing when the temperature and amount of HEC in the gel matrix increased.…”

Section: Introductionmentioning

confidence: 99%

Acetylsalicylic Acid (ASA) on Hydroxyethylcellulose/Polyacrylamide Gel (HEC/PAAm) as a Proposal for a Dermatological Compress: Mathematical Modeling of ASA Release Kinetics

Castillo-Miranda

Castro-Guerrero

Velasco-Ocejo

et al. 2019

International Journal of Polymer Science

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Currently, acne in adolescents and adults is caused by an infection in follicles caused by hormonal changes, stress, water pollution, air, and earth; the last one comes into contact with the skin through the hands of patients. This project presents the incorporation of acetylsalicylic acid (ASA) to the hydroxyethylcellulose/polyacrylamide gel (HEC/PAAm) in the synthesis of gel or by its swelling.The results show us that the incorporation of ASA is possible by both methods; first, the incorporation by synthesis of degradation of the gel is more visible. The infrared spectroscopic analysis shows the functional groups of gel and ASA, 2921 and 2863 cm −1 , whose assignments correspond to CH 3 and CH 2 groups, which are part of both the polymer and the ASA molecule, which confirms the interaction between the two groups. The microscopy photographs (SEM) show on the surface the drug in irregular whitish orthorhombic forms due to swelling; arborescent structures are observed in the case of the incorporation of the ASA drug by synthesis. Swelling kinetics has a Fickian form. The Higuchi model conforms to the release of ASA because the level of confidence is 90%. This gel was allowed to release 0.35 mg/hour, thus allowing the patient to have a continuous form of the release, in the affected area in a short period of time.

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“…Swelling and deswelling behaviors of scaffolds in aqueous are essential in biomedical applications because they control the diffusion and release of drugs and nutrients in tissue application [23]. The high swelling and deswelling rate of MWCNT-agarose scaffolds might be ascribed to the hydrophilicity nature of both agarose and water dispersed MWCNTs or/and changes of agarose scaffolds in spatial structure caused by MWCNTs [10,22,70]. As the concentration of MWCNT increases, the swelling and deswelling rate of scaffolds reduce may be attributed to the decrease of free space among agarose chains.…”

mentioning

confidence: 99%

Preparation of Multiwall Carbon Nanotubes Embedded Electroconductive Multi-Microchannel Scaffolds for Neuron Growth under Electrical Stimulation

Liu

Yushan

Alike

et al. 2020

BioMed Research International

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Objectives. To prepare the conductive MWCNT (multiwall carbon nanotube)-agarose scaffolds with multi-microchannel for neuron growth under electrical stimulation. Methods. The scaffolds were produced by gradient freeze and lyophilization methods. The synthesized materials were characterized by SEM and near-infrared spectroscopy, and their microstructure, swelling-deswelling, conductivity, biocompatibility, and shape memory behavior were measured. A three-dimensional culture model by implanting cells into scaffolds was built, and the behaviors of RSC96 cells on scaffolds under electrical stimulation were evaluated. Results. The addition of MWCNT did not affect the pore composition ratio and shape memory of agarose scaffolds, but 0.025% wt MWCNT in scaffolds improved the swelling ratio and water retention at the swelling equilibrium state. Though MWCNTs in high concentration had slight effect on proliferation of RSC96 cells and PC12 cells, there was no difference that the expressions of neurofilament of RSC96 cells on scaffolds with MWCNTs of different concentration. RSC96 cells arranged better along the longitudinal axis of scaffolds and showed better adhesion on both 0.025% MWCNT-agarose scaffolds and 0.05% MWCNT-agarose scaffolds compared to other scaffolds. Conclusions. Agarose scaffolds with MWCNTs possessed promising applicable prospect in peripheral nerve defects.

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Effect of temperature and pH on swelling behavior of hydroxyethyl cellullose-acrylamide hydrogel

Cited by 13 publications

References 7 publications

Swelling performance of sodium polyacrylate and poly(acrylamide-co-acrylic acid) potassium salt

Swelling performance of sodium polyacrylate and poly(acrylamide-co-acrylic acid) potassium salt

Acetylsalicylic Acid (ASA) on Hydroxyethylcellulose/Polyacrylamide Gel (HEC/PAAm) as a Proposal for a Dermatological Compress: Mathematical Modeling of ASA Release Kinetics

Preparation of Multiwall Carbon Nanotubes Embedded Electroconductive Multi-Microchannel Scaffolds for Neuron Growth under Electrical Stimulation

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