Rapid synthesis of macroporous graphene oxide/poly(acrylic acid-co-acrylamide) nanocomposite hydrogels with pH-sensitive behavior by frontal polymerization

RSC Advances ◽  
2016 ◽  
Vol 6 (40) ◽  
pp. 33426-33432 ◽  
Author(s):  
Shengfang Li ◽  
Shilin Yan
Keyword(s):  
Graphene Oxide ◽  
Acrylic Acid ◽  
Water Solution ◽  
Solvent Mixture ◽  
Ph Sensitive ◽  
Frontal Polymerization ◽  
Nanocomposite Hydrogels ◽  
Conductive Medium ◽  
Sensitive Behavior ◽  
Poly Acrylic Acid

Macroporous pH-sensitive graphene oxide (GO)/poly(acrylic acid-co-acrylamide) (PAA) nanocomposite hydrogels were prepared by frontal polymerization (FP) using a solvent mixture composed of DMF and a small quantity of GO water solution as a heat conductive medium.

Self-healable, super tough graphene oxide–poly(acrylic acid) nanocomposite hydrogels facilitated by dual cross-linking effects through dynamic ionic interactions

2015 ◽  
Vol 3 (19) ◽  
pp. 4001-4008 ◽  
Author(s):  
Ming Zhong ◽  
Yi-Tao Liu ◽  
Xu-Ming Xie
Keyword(s):  
Graphene Oxide ◽  
Acrylic Acid ◽  
Ionic Interactions ◽  
Cross Linking ◽  
Nanocomposite Hydrogels ◽  
Poly Acrylic Acid

Self-healable, super tough nanocomposite hydrogels facilitated by dual cross-linking effects through dynamic ionic interactions.

scholarly journals Novel Synthesis, Characterization and Amoxicillin Release Study of pH-Sensitive Nanosilica/Poly(acrylic acid) Macroporous Hydrogel with High Swelling

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 469
Author(s):  
Tannaz Soltanolzakerin Sorkhabi ◽  
Mehrab Fallahi Samberan ◽  
Krzysztof Adam Ostrowski ◽  
Tomasz M. Majka
Keyword(s):  
Electron Microscopy ◽  
Acrylic Acid ◽  
Sio2 Nanoparticles ◽  
Absorption Capacity ◽  
Ph Sensitive ◽  
Polymerization Process ◽  
Dominant Factor ◽  
Release System ◽  
Nanocomposite Hydrogels ◽  
Poly Acrylic Acid

The effect of SiO2 nanoparticles on the formation of PAA (poly acrylic acid) gel structure was investigated with seeded emulsion polymerization method used to prepare SiO2/PAA nanoparticles. The morphologies of the nanocomposite nanoparticles were studied by transmission electron microscopy (TEM). Fourier-transform infrared (FTIR) spectroscopy results indicated that the PAA was chemically bonded to the surface of the SiO2 nanoparticles. Additionally, the resulting morphology of the nanocomposite nanoparticles confirmed the co-crosslinking role of the SiO2 nanoparticles in the formation of the 3D structure and hydrogel of PAA. SiO2/PAA nanocomposite hydrogels were synthesized by in situ solution polymerization with and without toluene. The morphology studies by field emission scanning electron microscopy (FESEM) showed that when the toluene was used as a pore forming agent in the polymerization process, a macroporous hydrogel structure was achieved. The pH-sensitive swelling behaviors of the nanocomposite hydrogels showed that the formation of pores in the gels structure was a dominant factor on the water absorption capacity. In the current research the absorption capacity was changed from about 500 to 4000 g water/g dry hydrogel. Finally, the macroporous nanocomposite hydrogel sample was tested as an amoxicillin release system in buffer solutions with pHs of 3, 7.2, and 9 at 37 °C. The results showed that the percentage cumulative release of amoxicillin from the hydrogels was higher in neutral and basic mediums than in the acidic medium and the amoxicillin release rate was decreased with increasing pH. Additionally, the release results were very similar to swelling results and hence amoxicillin release was a swelling controlled-release system.

Development of a facile one-pot synthesis method for an ingestible pH sensitive actuator

MRS Advances ◽  
2019 ◽  
Vol 5 (17) ◽  
pp. 881-889
Author(s):  
Alex Keller ◽  
Holly Warren ◽  
Marc in het Panhuis
Keyword(s):  
Acrylic Acid ◽  
Calcium Hydroxide ◽  
Sodium Citrate ◽  
Synthesis Method ◽  
Gastric Fluid ◽  
Ph Sensitive ◽  
One Pot ◽  
Acidic Environments ◽  
Printed Materials ◽  
Poly Acrylic Acid

ABSTRACTEdible devices are an emergent technology and in this paper the simplicity and efficacy that poly(acrylic acid)/calcium hydroxide possess in creating a pH sensitive ingestible actuator which responds to acidic environments such as gastric fluid is demonstrated. It was found that poly(acrylic acid)/calcium hydroxide hydrogels exhibit reversible actuation upon submerging in 0.1 M sodium citrate for 2 hours. Our results show that these hydrogels can restore their compressive stress to 0.19 ± 0.06 MPa, swelling ratio to 26 ± 2 and volume to 56% ± 3% of its original volume. This work offers new possibilities for developments in a variety of fields such as drug delivery, 4D printed materials, soft robotics and edible devices.

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