Compressible Metalized Soft Magnetic Sponges with Tailorable Electrical and Magnetic Properties

Abstract

Porous metallic sponge has shown enormous application potential in many fields including electrochemical electrode, catalysis, sensors, separation and purification, microwave and sound inhibition, etc. In this paper, we described the preparation of a class of highly compressible NiÀ Co alloy-based sponges with tailorable conductivity and soft magnetic properties as well as EMI shielding ability by employing elastic porous melamine sponge as the support. The melamine sponge was first modified by one-step dopamine-triggered radical polymerization reaction, in which polymer brushes with quaternary ammonium cations were grafted onto the sponge fibers for the capture of negative catalyst moieties. The immobilized catalyst moieties could subsequently induce in-situ chemical deposition of a uniform and well-adhesive NiÀ Co alloy layer with controllable compositions and thickness on the fiber surface owing to the interpenetrating network between hydrophilic polymer brushes and the in-situ deposited metal layer. The obtained alloy sponges show good compression-resilience property, excellent conductivity and favorable soft magnetic performance as well as good compressive fatigue resistance during repeated compression-release cycles, and thus can find promising applications in many fields, including pressure resistance sensors, magnetic controlled pollutant absorbents, tunable EMI shielding materials, etc.

A Flexible and Moisturizing Multilayer Microporous Sponge Copolymerized with Keratin and Alginate

“…As we know, sponges are attractive soft materials, which could be used as matrices of diverse biomaterials. [24,25] Therefore, the appearance and micromorphology of the FK-SA sponge and its materials were measured. The appearance of freeze-dried materials including FK, SA, FK/SA composite and FK-SA sponge are shown in Figure 1 (a, b, c, d).…”

“…As we know, sponges are attractive soft materials, which could be used as matrices of diverse biomaterials [24,25] . Therefore, the appearance and micromorphology of the FK‐SA sponge and its materials were measured.…”

Electroless Metallization of the Elements: Survey and Progress

“…Hu and Yang and co-workers 284 adopt a related approach to prepare EL CoNi sponges in which porous melamine sponges are treated with an alkaline solution containing dopamine and [2-(methacryloyloxy)ethyl]trimethylammonium chloride (METAC) to graft poly co-PDA-METAC films onto the sponge. Electrostatic binding of PdCl 4 2− by METAC quaternary ammonium sites catalyzes alloy deposition, yielding robust, flexible CoNi sponges.…”

Ag Nanoparticle-Enabled Electroless Deposition of Ni on Mine-Formaldehyde Sponges for Oil–Water Separation, Piezoresistive Sensing, and Electromagnetic Shielding

“…ELD is a cost-effective and facile method for constructing metal coatings on various substrates. 34−36 There are some ELD processes for depositing uniform metal layers, which include cationic polymer interface assisted deposition, 37,38 anionic polymer matrix assisted deposition, 39 nonionic polymer interface assisted deposition, 40,41 and polyphenols interface assisted deposition. 42 Recently, we demonstrated an ELD strategy of polymer assisted metal deposition (PAMD) for the preparation of Agcoated composite materials.…”

“…It is interesting that some approaches can be employed to deposit a metal layer onto different substrates, such as physical vapor phase deposition (PVD), chemical vapor deposition (CVD), electrodeposition, , and electroless deposition (ELD). − To circumvent the costly instruments and possible damage caused by PVD/CVD as well as the limitation to conductive substrates of electrodeposition, the ELD process has been developed. ELD is a cost-effective and facile method for constructing metal coatings on various substrates. − There are some ELD processes for depositing uniform metal layers, which include cationic polymer interface assisted deposition, , anionic polymer matrix assisted deposition, nonionic polymer interface assisted deposition, , and polyphenols interface assisted deposition …”