Advanced ferrogels with high magnetic response and wear resistance using carbon nanotubes

Awasthi, Shikha; Gaur, Jeet Kumar; Bobji, M. S.

doi:10.1016/j.jallcom.2020.156259

Cited by 22 publications

(14 citation statements)

References 50 publications

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“…The polyacrylamide hydrogel (PAM) was prepared by the free radical polymerization reaction with the acrylamide monomer. Ammonium persulfate and tetramethylethylenediamine were used as catalysts, while N , N ′-methylene bisacrylamide was used as a cross-linker for the reaction . The chemicals were purchased from Sigma-Aldrich.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…Ammonium persulfate and tetramethylethylenediamine were used as catalysts, while N,N′-methylene bisacrylamide was used as a crosslinker for the reaction. 22 The chemicals were purchased from Sigma- Aldrich. The concentration of the used chemicals is given in Table 1 along with the nomenclature of the samples.…”

Section: Experimental Studies 211 Preparation Of Hydrogelmentioning

confidence: 99%

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High-Strength, Strongly Bonded Nanocomposite Hydrogels for Cartilage Repair

Awasthi

Gaur

Pandey

et al. 2021

ACS Appl. Mater. Interfaces

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Polyacrylamide-based hydrogels are widely used as potential candidates for cartilage replacement. However, their bioapplicability is sternly hampered due to their limited mechanical strength and puncture resistance. In the present work, the strength of polyacrylamide (PAM) hydrogels was increased using titanium oxide (TiO2) and carbon nanotubes (CNTs) separately and a combination of TiO2 with CNTs in a PAM matrix, which was interlinked by the bonding between nanoparticles and polymers with the deployment of density functional theory (DFT) approach. The synergistic effect and strong interfacial bonding of TiO2 and CNT nanoparticles with PAM are attributed to high compressive strength, elastic modulus (>0.43 and 2.340 MPa, respectively), and puncture resistance (estimated using the needle insertion test) for the PAM–TiO2–CNT hydrogel. The PAM–TiO2–CNT composite hydrogel revealed a significant self-healing phenomenon along with a sign toward the bioactivity and cytocompatibility by forming the apatite crystals in simulated body fluid as well as showing a cell viability of ∼99%, respectively. Furthermore, for new insights on interfacial bonding and structural and electronic features involved in the hydrogels, DFT was used. The PAM–TiO2–CNT composite model, constructed by two interfaces (PAM–TiO2 and PAM–CNT), was stabilized by H-bonding and van der Waals-type interactions. Employing the NCI plot, HOMO–LUMO gap, and natural population analysis tools, the PAM–TiO2–CNT composite has been found to be most stable. Therefore, the prepared polyacrylamide hydrogels in combination with the TiO2 and CNT can be a remarkable nanocomposite hydrogel for cartilage repair applications.

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Section: Materials and Methodsmentioning

confidence: 99%

Section: Experimental Studies 211 Preparation Of Hydrogelmentioning

confidence: 99%

High-Strength, Strongly Bonded Nanocomposite Hydrogels for Cartilage Repair

Awasthi

Gaur

Pandey

et al. 2021

ACS Appl. Mater. Interfaces

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“…26,85,185,209 Biomaterial surfaces modified by HA currently have a wide market for hard tissue replacements 210 or orthopedic applications. 78,211 Other prominent biomaterials include bioglass, 212,213 copper, 214 chitosan, 215 diamond-like carbon, 216,217 hydrogels, 204,[218][219][220] gold, 44 platinum, 221 silver, 222 silica, 161 tantalum, 4 titania, 60 and zircon. 223 HA has been the most interesting and popular coating material employed for the surface modifications of implants.…”

Section: Hydroxyapatite Coating For Orthopedic Applications: Future S...mentioning

confidence: 99%

“…PLA/HA, 188 Ti/HA, 200 Zr/HA 200 Wear-resistant In bone joint replacement, the material should resist friction and not elicit wear particles into the body Graphene/HA, 201 CNT/HA, 16 CNT/Al 2 O 3 , 202 CNT/TiO 2 , 202 ND, 203 CNT/ferrogel 204 Al 2 O 3 /HA 6Al-4V implant could not fill the bone gap even after 2 months. 230 Despite the clinical success, being brittle, synthetic HA exhibits inferior mechanical and tribological properties as compared to bone, especially showing very poor surface mechanical properties such as low fracture toughness, bending strength, bonding strength, tensile strength, and wear resistance.…”

Section: Wettabilitymentioning

confidence: 99%

Bioactive surface modifications through thermally sprayed hydroxyapatite composite coatings: a review of selective reinforcements

et al. 2022

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“…However, the random distribution and easy aggregation behavior of CNTs limit the properties of hydrogels. The modification of CNTs is the key to overcoming the poor compatibility between CNTs and the polymer matrix [170,171]. Han et al [172] reported a multi-functional conductive hydrogel based on PVA-borax and CNT-CNF composite materials, in which borax was used as a cross-linker to make the hydrogel mechanically tough and self-heal.…”

Section: Carbon-based Nanomaterialsmentioning

confidence: 99%

Self-Healing Mechanism and Conductivity of the Hydrogel Flexible Sensors: A Review

Zhang

Wang

Wei

et al. 2021

Gels

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Sensors are devices that can capture changes in environmental parameters and convert them into electrical signals to output, which are widely used in all aspects of life. Flexible sensors, sensors made of flexible materials, not only overcome the limitations of the environment on detection devices but also expand the application of sensors in human health and biomedicine. Conductivity and flexibility are the most important parameters for flexible sensors, and hydrogels are currently considered to be an ideal matrix material due to their excellent flexibility and biocompatibility. In particular, compared with flexible sensors based on elastomers with a high modulus, the hydrogel sensor has better stretchability and can be tightly attached to the surface of objects. However, for hydrogel sensors, a poor mechanical lifetime is always an issue. To address this challenge, a self-healing hydrogel has been proposed. Currently, a large number of studies on the self-healing property have been performed, and numerous exciting results have been obtained, but there are few detailed reviews focusing on the self-healing mechanism and conductivity of hydrogel flexible sensors. This paper presents an overview of self-healing hydrogel flexible sensors, focusing on their self-healing mechanism and conductivity. Moreover, the advantages and disadvantages of different types of sensors have been summarized and discussed. Finally, the key issues and challenges for self-healing flexible sensors are also identified and discussed along with recommendations for the future.

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Advanced ferrogels with high magnetic response and wear resistance using carbon nanotubes

Cited by 22 publications

References 50 publications

High-Strength, Strongly Bonded Nanocomposite Hydrogels for Cartilage Repair

High-Strength, Strongly Bonded Nanocomposite Hydrogels for Cartilage Repair

Bioactive surface modifications through thermally sprayed hydroxyapatite composite coatings: a review of selective reinforcements

Self-Healing Mechanism and Conductivity of the Hydrogel Flexible Sensors: A Review

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