Facile method to synthesize silver nanoparticles on the surface of hollow glass microspheres and their microwave shielding properties

Huang, Zheng; Chi, Bo; Guan, Jianguo; Liu, Yaqing

doi:10.1039/c4ra01617c

Cited by 16 publications

(7 citation statements)

References 53 publications

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“…However, on the other hand, the weak interface between the substrate and the hollow glass microsphere can easily reduce the material mechanics. Therefore, there are two main research directions for the modification of hollow glass microsphere surface, first, through deposition or graft functional fillers on hollow glass microsphere surface, such as silver, polyphenylamine, nickel, and graphene oxide, to achieve the performance of composite foam material infrared stealth, [27][28][29] electromagnetic shielding, 30,31 electromagnetic absorption, 32,33 and so on. Second, the binding force with the substrate is enhanced by the surface modification of hollow glass microsphere.…”

Section: Introductionmentioning

confidence: 99%

Effects of silane coupling agent modifications of hollow glass microspheres on syntactic foams with epoxy matrix

Fan

Wang

et al. 2021

Polymers and Polymer Composites

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A syntactic foam was prepared from an epoxy resin matrix and modified hollow glass microsphere fillers. Modification by silane coupling agents with different molecular structures was analyzed, and the optimal content of the silane coupling agent was determined. The results demonstrated that all silane coupling agents enhanced the adhesion between the hollow glass microspheres and epoxy resin matrix, resulting in enhanced water absorption, compressive performance, tensile performance, and bending performance compared to those prepared using unmodified hollow glass microspheres. Among silane coupling agents with different end groups, the one with a sulfhydryl end group exhibited optimal modification for hollow glass microspheres. Among the silane coupling agents with different backbone structures, the one with silanol groups exhibited the optimal modification of hollow glass microspheres. Additionally, the performance of the syntactic foams was optimal when 6% of the silanol-containing coupling agent was used. The results demonstrated that syntactic foams prepared with hollow glass microspheres modified by silane coupling agents exhibited improvements in water absorption, compressive performance, tensile performance, and bending performance, compared with those prepared using unmodified hollow glass microspheres. Among silane coupling agents with different end structures, the one with a sulfhydryl group as end group showed the best modification effect on hollow glass microspheres. The water absorption was 0.35%, the compressive strength was 62.15 MPa, the tensile strength was 40.15 MPa, and the bending strength was 53.17 MPa. Among silane coupling agents with different backbone structures, the one with silanol groupsbonds showed the best results. Its compressive strength was up to 64.15 MPa, the tensile strength was 35.47 MPa, and the bending strength was 53.99 MPa.

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Section: Introductionmentioning

confidence: 99%

Effects of silane coupling agent modifications of hollow glass microspheres on syntactic foams with epoxy matrix

Fan

Wang

et al. 2021

Polymers and Polymer Composites

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“…11 In the drive to develop efficient microwave absorbers and electromagnetic shields, graphene and graphene-like materials integrated with inorganic nanostructures have received tremendous attention in recent years due to the rapid growth of electronic industry. 5,10,19 Graphene is highly desirable as an electromagnetic wave absorber at high frequencies over the gigahertz range due to its high dielectric loss and low density. 2 Barium ferrites (BaFe 12 O 19 ) are well-known hard magnetic materials, which find applications in many fields such as permanent magnets, magnetic recording media, microwave devices and electromagnetic interference shielding.…”

Section: Introductionmentioning

confidence: 99%

Barium ferrite decorated reduced graphene oxide nanocomposite for effective electromagnetic interference shielding

Verma

Singh

Sambyal

et al. 2015

Phys. Chem. Chem. Phys.

199

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“…This technique made it possible to directly deposit uniform silver coatings onto the surface of Al microspheres, due to the PDA layer with well-preserved indole functional groups using as the chemisorption sites for the silver nuclei during electroless silver plating. However, anchoring palladium colloid is required to enable these N-containing functional groups as more efficient active sites for the formation of silver crystal nuclei in our recent work . This is because the N-containing functional groups have relatively weak binding affinity for Ag + in comparison with thoil groups, resulting in limited nucleation sites in electroless silver plating.…”

Section: Introductionmentioning

confidence: 99%

“…However, anchoring palladium colloid is required to enable these N-containing functional groups as more efficient active sites for the formation of silver crystal nuclei in our recent work. 21 This is because the N-containing functional groups have relatively weak binding affinity for Ag + in comparison with thoil groups, resulting in limited nucleation sites in electroless silver plating. Therefore, PDA-assisted electroless plating method suffers from the undesirable high content of Ag (more than 40 wt %) or thick silver shell (more than 350 nm) in the composite particles.…”

Section: ■ Introductionmentioning

confidence: 99%

Surface Thiolation of Al Microspheres to Deposite Thin and Compact Ag Shells for High Conductivity

et al. 2015

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In this work, we have demonstrated a method for controllable thiolated functionalization coupled with electroless silver plating to achieve aluminum@silver (Al@Ag) core-shell composite particles with thin and compact layers. First, Al microspheres were functionalized by a well-known polymerizable silane coupling agent, i.e., 3-mercaptopropyltrimethoxysilane (MPTMS). Decreasing the ethanol-to-water volume ratio (F) in silane solution produces modification films with high content of thiol groups on Al microspheres, owing to the dehydration of silane molecules with hydroxyl groups on Al microspheres and self-polymerization of silane molecules. Then, ethanol was used as one of the solvents to play a major role in the uniform dispersion of silane coupling agent in the solution, resulting in uniformly distributing and covalently attaching thiol groups on Al microspheres. In electroless silver plating, thiol groups being densely grafted on the surface of Al microspheres favor the heterogeneous nucleation of Ag, since the thiol group can firmly bind with Ag(+) and enable the in situ reduction by the reducing reagent. In this manner, dense Ag nuclei tend to produce thin and compact silver shells on the Al microspheres surfaces. The as-obtained Al@Ag core-shell composite particles show a resistivity as low as (8.58 ± 0.07) × 10(-5) Ω·cm even when the Ag content is as low as 15.46 wt %. Therefore, the as-obtained Al@Ag core-shell composite particles have advantages of low weight, low silver content and high conductivity, which could make it a promising candidate for application in conductive and electromagnetic shielding composite materials.

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Facile method to synthesize silver nanoparticles on the surface of hollow glass microspheres and their microwave shielding properties

Abstract: In this paper, a facile method for the fabrication of hollow glass microspheres–Ag composite particles with core–shell structures is investigated.

Cited by 16 publications

References 53 publications

Effects of silane coupling agent modifications of hollow glass microspheres on syntactic foams with epoxy matrix

Effects of silane coupling agent modifications of hollow glass microspheres on syntactic foams with epoxy matrix

Barium ferrite decorated reduced graphene oxide nanocomposite for effective electromagnetic interference shielding

Surface Thiolation of Al Microspheres to Deposite Thin and Compact Ag Shells for High Conductivity

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