Circumambient tissues infection is a common complication of implanted percutaneous
and permucosal devices (PDs). In order to counter the infection, the titanium abutment surface of
PDs was modified to achieve antibacterial and antiadhesive activities. Titanium discs were
immersed into hydroxyapatite (HA) sol containing different mass fraction silver and thermally
treated to get modified discs. The modified discs become more smoother and get crystal HA
coatings containing silver. Silver ion release test demonstrate the release rate is very slow and the
coating is a reservoir of silver. The antibacterial and antiadhesive effects of modified discs on
Staphylococcus aureus and Porphyromonas gingivalis were evaluated. Modified titanium discs with
silver significantly inhibited the growth of these two bacteria compared with both the polished
titanium discs control and modified titanium discs without silver. And titanium discs modified with
more silver have higher antibacterial activity and less bacteria adhesion in this study. These findings
indicate that titanium surface modified with the HA sol-gel containing silver could achieve
antibacterial and antiadhesive activities, and the abutments of PDs are promising to be modified by
this method.
The development of highly thermally conductive composites with excellent electrical insulation has attracted extensive attention, which is of great significance to solve the increasingly severe heat concentration issue of electronic equipment. Herein, we report a new strategy to prepare boron nitride nanosheets (BNNSs) via an ion-assisted liquid-phase exfoliation method. Then, silver nanoparticle (AgNP) modified BNNS (BNNS@Ag) was obtained by in situ reduction properties. The exfoliation yield of BNNS was approximately 50% via the ion-assisted liquid-phase exfoliation method. Subsequently, aramid nanofiber (ANF)/BNNS@Ag composites were prepared by vacuum filtration. Owing to the “brick-and-mortar” structure formed inside the composite and the adhesion of AgNP, the interfacial thermal resistance was effectively reduced. Therefore, the in-plane thermal conductivity of ANF/BNNS@Ag composites was as high as 11.51 W m−1 K−1, which was 233.27% higher than that of pure ANF (3.45 W m−1 K−1). The addition of BNNS@Ag maintained tensile properties (tensile strength of 129.14 MPa). Moreover, the ANF/BNNS@Ag films also had good dielectric properties and the dielectric constant was below 2.5 (103 Hz). Hence, the ANF/BNNS@Ag composite shows excellent thermal management performance, and the electrical insulation and mechanical properties of the matrix are retained, indicating its potential application prospects in high pressure and high temperature application environments.
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