Enhanced electromagnetic wave absorption performance of hematite@carbon nanotubes/polyacrylamide hydrogel composites with good flexibility and biocompatibility

Conductive nanocomposite hydrogels for flexible wearable sensors

“…Due to their inherent properties, carbon-based nanofillers can be combined with a wide range of polymer substrates and exhibit high performances, such as excellent stability, good mechanical properties, and high electrical conductivity. 57,58 Based on these versatile properties, hydrogels fabricated with carbon nanofillers can be widely used in flexible wearable electronics and sensors. Next, the main focus is on the development of conductive nanocomposite hydrogels based on the widest range of carbon-based nanofillers (including CB, CNTs, and GO) for flexible wearable sensors.…”

Highly Flexible Hydrogels with Readily Adjustable Electromagnetic Parameter for Efficient Electromagnetic Wave Absorption

“…When the volume of Fe 2 O 3 @CNTs is 2%, the RL min reaches −60.96 dB and the corresponding EAB is 3.40 GHz at a thickness of 1.63 mm. 33 It is not difficult to spot that most researchers introduce fillers into the hydrogel composites in order to improve the EMW absorption properties. Although the introduction of fillers can improve the EMW absorption performance of hydrogels, achieving uniform dispersion of fillers is challenging.…”

“…However, the large filling ratio, narrow absorption bandwidth, and poor machinability limit their application scenarios. With the rise of wearable and foldable devices, there is an increasing demand for flexible EMW-absorbing materials. − At present, plenty of flexible EMW-absorbing materials have been developed, such as foams, − aerogels, − films, − hydrogels, − and so on. , The abundant pore structure inside foams and aerogels can not only reduce the weight of the materials but also provide space for EMW to reflect and scatter, which is conducive to enhancing the absorption capacity of materials. However, the limited flexibility and stretchability hinder their further development.…”

“…Long et al synthesized hematite @carbon nanotubes/polyacrylamide hydrogel composites (Fe 2 O 3 @CNTs/PAM). When the volume of Fe 2 O 3 @CNTs is 2%, the RL min reaches −60.96 dB and the corresponding EAB is 3.40 GHz at a thickness of 1.63 mm . It is not difficult to spot that most researchers introduce fillers into the hydrogel composites in order to improve the EMW absorption properties.…”

Composite hydrogels with antioxidant and robust adhesive properties for the prevention of radiation-induced dermatitis

“…32,33 Polyacrylamide (PAM) is a water-soluble macromolecule characterized by the significant presence of amide linkages within its structure, as well as the capacity to retain both its shape and mechanical strength, and it is often used in the preparation of hydrogels. 34 However, the mechanical properties of PAM hydrogels are compromised by its inherent network structure characteristics. To broaden the scope of PAM hydrogel applications, researchers have endeavored to synthesize high-strength hydrogels through the incorporation of inorganic nanocomposites, the introduction of novel crosslinking networks, and the augmentation of the crosslinking degree.…”