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Author:

Guan, Tianyu (Guan, Tianyu.) | Zhang, Honggang (Zhang, Honggang.) | Fang, Fengzhou (Fang, Fengzhou.) | Zhang, Nan (Zhang, Nan.)

Indexed by:

EI Scopus SCIE

Abstract:

To reduce the adhesion and friction between polymer and mould surfaces during polymeric micro/nano structures replication, we have used tungsten disulfide (WS2) nanosheets to fabricate high-performance nickel/WS2 nanocomposite mould using electroforming. However, the aggregation of WS2 nanosheets in the electroforming solution is a critical issue that influences the mechanical and tribological properties of the mould. In this study, we first propose a new strategy of combining anionic surfactant sodium dodecyl sulfate (SDS) and cationic surfactant cetyltrimethylammonium bromide (CTAB) to achieve uniform dispersion and incorporation of WS2 nanosheets in the electroformed nickel mould. Our results indicate that appropriately designing the structure of CTAB-SDS complex can achieve a stable WS2 dispersion, contributing to the uniform co-deposition of WS2 nanosheets into nickel mould. The combination of high concentration of CTAB and SDS (1.0 g/L CTAB and 1.0 g/ L SDS) significantly improved the dispersibility and incorporation of WS2 into the nickel matrix, compared to individual SDS or CTAB. Consequently, the maximum hardness enhanced by 350% from 284 HV for pure nickel to 1280 HV for nickel/WS2 nanocomposite mould, along with the coefficient of friction (COF) against the polymethyl methacrylate (PMMA) pin reducing from 0.75 to 0.31. It is also found that CTAB promotes particle encapsulation while SDS improves the particle dispersion but cannot control the particle incorporation. The surface wettability of nickel/WS(2)mould altered to hydrophobicity from hydrophilicity of nickel mould, where the adhesion-induced wear caused by polymer pin significantly reduced. Moreover, the surface roughness did not change much with the incorporation of WS2 into the mould, which is acceptable for mould applications. Finally, the nickel/WS2 nanocomposite mould was successfully fabricated via electroforming and its self-lubricating properties was validated by micro hot embossing PMMA microfluidic chips with good surface quality.

Keyword:

Friction and wear Mould Hardness Electroforming Surfactants

Author Community:

  • [ 1 ] [Guan, Tianyu]Univ Coll Dublin, Ctr Micro Nano Mfg Technol MNMT Dublin, Sch Mech & Mat Engn, Dublin 4, Ireland
  • [ 2 ] [Fang, Fengzhou]Univ Coll Dublin, Ctr Micro Nano Mfg Technol MNMT Dublin, Sch Mech & Mat Engn, Dublin 4, Ireland
  • [ 3 ] [Zhang, Nan]Univ Coll Dublin, Ctr Micro Nano Mfg Technol MNMT Dublin, Sch Mech & Mat Engn, Dublin 4, Ireland
  • [ 4 ] [Zhang, Honggang]Beijing Univ Technol, Fac Mat & Mfg, Beijing 100124, Peoples R China
  • [ 5 ] [Fang, Fengzhou]Tianjin Univ, State Key Lab Precis Measuring Technol & Instrumen, Lab Micro Nano Mfg Technol MNMT, Tianjin 300072, Peoples R China

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Source :

SURFACE & COATINGS TECHNOLOGY

ISSN: 0257-8972

Year: 2022

Volume: 437

5 . 4

JCR@2022

5 . 4 0 0

JCR@2022

ESI Discipline: MATERIALS SCIENCE;

ESI HC Threshold:66

JCR Journal Grade:1

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count: 21

SCOPUS Cited Count: 21

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 3

Affiliated Colleges:

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