Sterculia lychnophora seed-derived porous carbon@CoFe2O4 composites with efficient microwave absorption performance

Self-Healing and Freeze-Resistant Boat-Fruited Sterculia Seed Polysaccharide/Silk Fiber Hydrogel for Wearable Strain Sensors

“…Boat-fruited Sterculia seeds are mature, dry seeds of Sterculia lychnophora Hance, belonging to the genus Sterculia of the Parasolaceae family . The BF was extracted from boat-fruited Sterculia seeds through thermal hydrolysis and was mainly composed of galacturonic acid, β- d -galactose, glucuronic acid, and l -rhamnose. , BF has a natural network-like structure with numerous hydrophilic groups, , which promote the formation of a hydrogel with a high water content and a porous structure. This structure characteristic makes BF different from general long-chain polysaccharides, so it is easier to quickly form a three-dimensional hydrogel network under the action of a cross-linking agent.…”

Toward Enhanced S-Band Absorption Ability via Ni Element Modification of Peach Pit Carbon

“…It is noteworthy that the irregularity of the semicircle implies the existence of multiple polarization mechanisms, including interface polarization and even polarization. Compared with other carbon-based absorbers, PC and Ni­(OH) 2 /C1 have the biggest amounts of polarization according to Cole–Cole diagram, , especially compared with those carbon-based absorbers which have microwave absorption performance in 2–4 GHz. , See Figure S8.…”

“…Theoretically speaking, dielectric loss mechanisms can be divided into polarization loss and conductive loss. , The better the conductivity of the carbon-based absorber is, the stronger the conductive loss is, while the worse the impedance match is. , Therefore, this becomes the key to restrict the absorption performance of the carbon-based absorber in the S-band. According to previous works, the impedance match can be described as the ratio of permeability and permittivity. , Consequently, the introduction of magnetic loss is necessary for carbon-based absorbers not only to improve the impedance match but also to increase the loss path of microwave. − At the same time, the elaborately designed structure is conducive to microwave absorption. − Hence, there are related works to enhance the absorption performance of the S-band. Wu et al synthesized Fe 3 O 4 –carbon core–shell nanorings to achieve good absorption ability in the S-band, but it reflects a thickness of 7–9 mm .…”

In Situ Synthesis of Heterostructured Fe–Ni Nanowires with Tunable Electromagnetic Wave Absorption Capabilities

“…The RL min value was −48.5 dB at 7.9 GHz and the EAB max value was 4.3 GHz at 2.5 mm with mass fraction of 20%. However, magnetic metallic materials can lead to limited dissipation capability and impedance matching imbalance due to their own simplex magnetic loss, which makes it difficult to obtain perfect EMW absorption capability . Therefore, preparing the Fe–Ni alloy as a one-dimensional heterogeneous structure can obtain favorable reflection loss with the coeffect of magnetic and dielectric losses.…”

“…However, magnetic metallic materials can lead to limited dissipation capability and impedance matching imbalance due to their own simplex magnetic loss, which makes it difficult to obtain perfect EMW absorption capability. 23 Therefore, preparing the Fe−Ni alloy as a one-dimensional heterogeneous structure can obtain favorable reflection loss with the coeffect of magnetic and dielectric losses. In this study, the one-dimensional magnetic Fe−Ni heterogeneous nanowire composites were satisfactorily fabricated by a simple magnetic-field-assisted liquid-phase reduction approach, taking into account both the advantages of electromagnetic parameter modulation of Fe−Ni alloys and the potent EMW absorption properties of one-dimensional materials.…”