scholarly journals Novel Graphene Oxide Nanohybrid Doped Methacrylic Acid Hydrogels for Enhanced Swelling Capability and Cationic Adsorbability

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1112
Author(s):  
Yufei Liu ◽  
Ying Lyu ◽  
Yongqin Hu ◽  
Jia An ◽  
Rubing Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Methacrylic Acid ◽  
Self Assembly ◽  
Diffusion Theory ◽  
Covalent Bond ◽  
Swelling Kinetics ◽  
Swelling Ratio ◽  
Ph Response ◽  
Swelling Capacity ◽  
Dye Absorption

Novel versatile hydrogels were designed and composited based on covalent bond and noncovalent bond self-assembly of poly(methacrylic acid) (PMAA) networks and nanohybrids doped with graphene oxide (GO). The structures and properties of the neat PMAA and the prepared PMAA/GO hydrogels were characterized and analyzed in detail, using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, swelling and cationic absorption, etc. The swelling results showed that the water penetration follows the non-Fick transport mechanism based on swelling kinetics and diffusion theory. The swelling capacity of PMAA and composited PMAA/GO hydrogels toward pH, Na+, Ga2+, and Fe3+ was investigated; the swelling ratio was tunable between 4.44 and 36.44. Taking methylene blue as an example, the adsorption capacity of PMAA/GO hydrogels was studied. Nanohybrid doped GO not only self-associated with PMAA via noncovalent bonding interactions and had a tunable swelling ratio, but also interacted with water molecules via electrostatic repulsion, offering a pH response of both the network and dye absorption. Increases in pH caused a rise in equilibrium swelling ratios and reduced the cumulative cationic dye removal.

scholarly journals Preparation of Polycaprolactone-Graphene Oxide Hydrogel as Potential Drug Delivery Carrier

2021 ◽  
Vol 33 (10) ◽  
pp. 2498-2502
Author(s):  
J. Dalagan ◽  
H. Barros, Jr
Keyword(s):  
Graphene Oxide ◽  
Drug Carrier ◽  
Equilibration Time ◽  
Swelling Ratio ◽  
Potential Drug ◽  
Bending Vibrations ◽  
Sem Images ◽  
Oh Groups ◽  
Drug Delivery Carrier ◽  
Swelling Capacity

Polycaprolactone-graphene oxide (PCL-GO) hydrogel composite was prepared using a facile method and characterized by Fourier transform Infrared (FTIR) and scanning electron microscopy (SEM). The swelling capacity of the hydrogel at varying temperature and equilibration time was also determined. IR analysis revealed a shifting of bands, which indicates H-bonding interactions between polycaprolactone and graphene oxide. Characteristic peaks of graphene oxide at 3500 cm-1 for -OH stretching and peaks of polycaprolactone at 1456, 1370, 1304 cm-1 for CH2 bending vibrations were observed. SEM images validated IR results with the occurrence of larger hollow regions, pores and insets indicating reaction of OH groups with the polymeric chains. The swelling ratio of the PCL-GO hydrogel was higher than polycaprolactone and graphene oxide at 4 h and 8 h equilibration time. The swelling ratio of PCL-GO at 40 ºC and 12 h equilibration time was 4.3, which was the highest among the swelling ratios. These data could imply that the PCL-GO prepared has the potential to be a potential drug carrier.

scholarly journals Layer-by-Layer Self-Assembly Composite Coatings for Improved Corrosion and Wear Resistance of Mg Alloy for Biomedical Applications

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 515
Author(s):  
Tongfang Liu ◽  
Song Rui ◽  
Sheng Li
Keyword(s):  
Wear Resistance ◽  
Self Assembly ◽  
Biomedical Applications ◽  
Composite Coatings ◽  
Covalent Bond ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Layer By Layer ◽  
Corrosion Propagation ◽  
Chemical Linkage

Mg alloys are promising biomedical metal due to their natural degradability, good processability, and favorable mechanical properties. However, the poor corrosion resistance limits their further clinical applications. In this study, the combined strategies of surface chemical treatment and layer-by-layer self-assembly were used to prepare composite coatings on Mg alloys to improve the biocorrosion resistance. Specially, alkalized AZ91 Mg alloy generated chemical linkage with silane via Si–O–Mg covalent bond at the interface. Subsequently, Si–OH group from silane formed a crosslinked silane layer by Si–O–Si network. Further chemical assembly with graphene oxide (GO), lengthened the diffusion pathway of corrosive medium. The chemically assembled composite coatings could firmly bond to Mg alloy substrate, which persistently and effectively acted as compact barriers against corrosion propagation. Improved biocorrosion resistance of AZ91 Mg alloy with self-assembly composite coatings of silane/GO was subsequently confirmed by immersion tests. Besides, the Mg alloy exhibited good wear resistance due to outside layer of GO with a lubricant effect. Cell viability of higher than 75% had also been found for the alloy with self-assembly composite coatings, which showed good cytocompatibility.

scholarly journals Direct Patterning and Spontaneous Self-Assembly of Graphene Oxide via Electrohydrodynamic Jet Printing for Energy Storage and Sensing

Micromachines ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 13 ◽  
Author(s):  
Bin Zhang ◽  
Jaehyun Lee ◽  
Mincheol Kim ◽  
Naeeung Lee ◽  
Hyungdong Lee ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Storage ◽  
Self Assembly ◽  
High Performance ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Layer By Layer ◽  
Energy Storage Devices ◽  
Laminar Structure ◽  
Jet Printing

The macroscopic assembly of two-dimensional materials into a laminar structure has received considerable attention because it improves both the mechanical and chemical properties of the original materials. However, conventional manufacturing methods have certain limitations in that they require a high temperature process, use toxic solvents, and are considerably time consuming. Here, we present a new system for the self-assembly of layer-by-layer (LBL) graphene oxide (GO) via an electrohydrodynamic (EHD) jet printing technique. During printing, the orientation of GO flakes can be controlled by the velocity distribution of liquid jet and electric field-induced alignment spontaneously. Closely-packed GO patterns with an ordered laminar structure can be rapidly realized using an interfacial assembly process on the substrates. The surface roughness and electrical conductivity of the LBL structure were significantly improved compared with conventional dispensing methods. We further applied this technique to fabricate a reduced graphene oxide (r-GO)-based supercapacitor and a three-dimensional (3D) metallic grid hybrid ammonia sensor. We present the EHD-assisted assembly of laminar r-GO structures as a new platform for preparing high-performance energy storage devices and sensors.

Reduced graphene oxide/MWCNT hybrid sandwiched film by self-assembly for high performance supercapacitor electrodes

2012 ◽  
Vol 108 (3) ◽  
pp. 701-707 ◽  
Author(s):  
Yong-Feng Li ◽  
Yan-Zhen Liu ◽  
Yong-Gang Yang ◽  
Mao-Zhang Wang ◽  
Yue-Fang Wen
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
High Performance ◽  
Reduced Graphene

Self-Assembly of Graphene Oxide at Interfaces

2014 ◽  
Vol 26 (32) ◽  
pp. 5586-5612 ◽  
Author(s):  
Jiao-Jing Shao ◽  
Wei Lv ◽  
Quan-Hong Yang
Keyword(s):  
Graphene Oxide ◽  
Self Assembly
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