It is well accepted that the tribological performance of surfaces can be directly correlated with their energy efficiency and lifetime. Consequently, surface patterning has gained great attention to manipulate friction and wear under dry and lubricated conditions in the last 2 decades. Inspired by multi-scale surfaces found in nature, direct laser interference patterning (finer cross-pattern) and hot micro-coining (coarser hemispherical patterns) were used to create multi-scale patterns on stainless steel substrates. Using a ball-on-disk set-up, the running-in behavior and the maximum oil film lifetime were characterized for all single-and multi-scale patterns under mixed lubrication. Compared to the polished reference, all patterned surfaces helped to prolong the oil film lifetime. Synergetic effects induced by multi-scale patterns were observed leading to the best performance of the sample combining deep micro-coined patterns (intermediate area density) with the additional laser pattern. As a result of the additional hydrodynamic pressure generated by the finer laser pattern and the oil reservoir effect as well as the entrapment of wear particles induced by the coarser micro-coined pattern, the oil film lifetime was extended by a factor of 200 (200 times).

Andreas Rosenkranz

Philipp G. Grützmacher

Kevin Murzyn

Cedric Mathieu

Frank Mücklich

Applied Nanoscience

APPLIED NANOSCIENCE 是一本混合期刊，发表关于最先进的纳米科学和新兴纳米技术在构建技术先进和可持续文明的基础领域的应用的原创文章，包括水科学、先进材料、能源、电子、环境科学等多种领域和药。该杂志接受原创和评论文章以及出版的书评。所有手稿均经过单盲同行评审，以确保科学质量和接受度。

Applied Nanoscience (Switzerland) is a hybrid journal dedicated to publishing original research articles on the applications of advanced nanoscience and emerging nanotechnologies in building a technologically advanced and sustainable civilization. It covers a wide range of fields, including water science, advanced materials, energy, electronics, environmental science, and pharmaceuticals. The journal accepts original research articles, review articles, and book reviews, with all submitted manuscripts undergoing single-blind peer review to ensure scientific quality and acceptance.

《Applied Nanoscience (Switzerland)》是一本混合期刊，专注于发表关于纳米科学及新兴纳米技术在构建技术先进和可持续文明中的应用的原创研究文章。涵盖的领域包括水科学、先进材料、能源、电子、环境科学等多个领域，以及药物科学。该期刊接受原创研究文章、评论文章和书评，所有提交的手稿均经过单盲同行评审，以确保科学质量和接受度。

Category	Quartile
工程技术	4
工程技术, 纳米科技	4

Multi-scale surface patterning to tune friction under mixed lubricated conditions

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