Influence of Chemistry and Topography on the Wettability of Copper

David Horwat (IJL); Florian Sch\"afer; Frank M\"ucklich; Michael Kopnarski; Philipp Gr\"utzmacher; Rolf Merz; Sarah Marie L\"o{\ss}lein; Yerila Rodr\'iguez-Mart\'inez (IJL)

arxiv: 2502.18938 · v2 · submitted 2025-02-26 · ❄️ cond-mat.mtrl-sci · physics.chem-ph

Influence of Chemistry and Topography on the Wettability of Copper

Sarah Marie L\"o{\ss}lein , Rolf Merz , Yerila Rodr\'iguez-Mart\'inez (IJL) , Florian Sch\"afer , Philipp Gr\"utzmacher , David Horwat (IJL) , Michael Kopnarski , Frank M\"ucklich This is my paper

Pith reviewed 2026-05-23 02:37 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci physics.chem-ph

keywords copper wettabilityhydrocarbon adsorptionsurface topographylaser patterningcontact anglehydrophobicitywetting anisotropy

0 comments

The pith

Adsorbed hydrocarbons dominate long-term wetting on copper surfaces over the underlying oxide state, while laser-created topographies allow tuning of contact angles and water adhesion.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The study separates the roles of surface chemistry and physical texture in how water interacts with copper. On polished samples, wetting behavior settles into a stable state even while hydrocarbons continue to build up, and this thin adsorbed layer overrides differences in the copper's oxidation state. Laser processing then introduces controlled roughness patterns that shift the static contact angle, create directional wetting differences, and change how strongly water clings to the surface. A reader would care because the work points to practical ways to set wetting properties through topography once the chemistry layer is understood.

Core claim

The long-term wetting response of polished copper surfaces stabilizes with time despite ongoing accumulation of hydrocarbons and is dominated by this adsorption layer over the oxide state of the substrate (Cu, CuO, Cu2O). The surfaces' wetting response can be precisely tuned by tailoring the topography via laser processing. The sub-pattern morphology of primary line-like patterns showed great impact on the static contact angle, wetting anisotropy, and water adhesion. An increased roughness inside the pattern valleys combined with a minor roughness on the peaks favors air-inclusions, isotropic hydrophobicity, and low water adhesion. Increasing the aspect ratio showed to enhance air-inclusions

What carries the argument

The hydrocarbon adsorption layer on the copper surface, together with the sub-pattern roughness created by ps-laser and DLIP processing.

If this is right

Polished copper reaches a time-stable wetting state that persists even as hydrocarbons keep accumulating.
The oxide forms Cu, CuO, and Cu2O exert less control on wetting than the adsorbed carbon layer.
Isotropic laser patterns and anisotropic line patterns produced by different pulse durations change static contact angle, anisotropy, and adhesion.
Valley roughness higher than peak roughness promotes air trapping, hydrophobicity, and reduced water adhesion.
Raising pattern aspect ratio increases hydrophobicity even when peak roughness also rises.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

Surface design for long service life may need to focus more on managing ongoing adsorption than on initial oxide removal.
Directional wetting without added coatings becomes feasible if the line-pattern sub-morphology can be reproduced on other substrates.
The same laser-pattern approach might be tested on other metals to check whether hydrocarbon dominance is general.

Load-bearing premise

The experimental steps keep surface chemistry effects cleanly separated from topography effects even when laser processing is used to create the patterns.

What would settle it

Measuring contact angles on the same copper samples before and after deliberate removal of the adsorbed hydrocarbon layer while holding oxide state fixed.

read the original abstract

To understand the complex interplay of topography and surface chemistry in wetting, fundamental studies investigating both parameters are needed. Due to the sensitivity of wetting to miniscule changes in one of the parameters it is imperative to precisely control the experimental approach. A profound understanding of their influence on wetting facilitates a tailored design of surfaces with unique functionality. We present a multi-step study: The influence of surface chemistry is analyzed by determining the adsorption of volatile carbonous species (A) and by sputter deposition of metallic copper and copper oxides on flat copper substrates (B). A precise surface topography is created by laser processing. Isotropic topography is created by ps laser processing (C), and hierarchical anisotropic line patterns are produced by direct laser interference patterning (DLIP) with different pulse durations (D). Our results reveal that the long-term wetting response of polished copper surfaces stabilizes with time despite ongoing accumulation of hydrocarbons and is dominated by this adsorption layer over the oxide state of the substrate (Cu, CuO, Cu2O). The surfaces' wetting response can be precisely tuned by tailoring the topography via laser processing. The sub-pattern morphology of primary line-like patterns showed great impact on the static contact angle, wetting anisotropy, and water adhesion. An increased roughness inside the pattern valleys combined with a minor roughness on the peaks favors air-inclusions, isotropic hydrophobicity, and low water adhesion. Increasing the aspect ratio showed to enhance air-inclusions and hydrophobicity despite increased peak roughness while time dependent wetting transitions were observed.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

The paper finds hydrocarbon adsorption sets long-term copper wetting more than oxide state, and laser sub-pattern details can tune contact angle, anisotropy and adhesion, but the chemistry-topography separation is not fully verified on the patterned surfaces themselves.

read the letter

The main point is that polished copper wetting stabilizes over time from adsorbed hydrocarbons, and this layer overrides the substrate oxide (Cu, CuO or Cu2O). Laser patterns, especially the roughness inside valleys versus peaks from ps-laser and DLIP, then let you adjust static contact angle, directional differences, and water adhesion through air trapping effects. An increased valley roughness with smoother peaks favors hydrophobicity and low adhesion, while higher aspect ratios strengthen that despite some peak roughness increase.

Referee Report

1 major / 1 minor

Summary. The manuscript reports a multi-step experimental study separating the effects of surface chemistry (hydrocarbon adsorption on polished Cu and sputter-deposited Cu/CuO/Cu2O layers on flat substrates) from topography (isotropic patterns via ps-laser ablation and anisotropic hierarchical lines via DLIP with varying pulse durations). It concludes that long-term wetting stabilizes due to the adsorption layer dominating over oxide state, and that sub-pattern morphology (valley/peak roughness, aspect ratio) enables precise tuning of static contact angle, wetting anisotropy, and water adhesion, with increased valley roughness favoring air inclusions and hydrophobicity.

Significance. If the experimental isolation of chemistry from topography holds, the work offers practical guidance for engineering copper surfaces with controlled wettability, relevant to applications in materials processing and surface functionalization. The use of controlled sputter deposition for oxide-state controls and dual laser methods for topography variants is a methodical strength that allows direct comparison of parameters.

major comments (1)

[Sections C and D] Sections describing the laser patterning experiments (C and D): the attribution of changes in static CA, anisotropy, and adhesion to sub-pattern morphology requires that laser processing does not differentially alter surface chemistry (oxide thickness or carbon coverage) across the pattern variants. Chemistry controls (A: adsorption monitoring; B: sputtered layers) are performed exclusively on unpatterned flats. No post-laser XPS, AES, or equivalent analysis is described on the patterned surfaces to verify that oxide states and hydrocarbon accumulation match the flat controls at the relevant measurement times. This assumption is load-bearing for the claim that topography alone enables precise tuning.

minor comments (1)

[Abstract] Abstract and methods: the distinction between 'ps laser processing' and 'DLIP with different pulse durations' would benefit from explicit pulse-duration values and a brief statement on how ablation debris or heat-affected zones were assessed or mitigated.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the constructive feedback and for recognizing the methodical strengths of our experimental design. We address the single major comment below.

read point-by-point responses

Referee: [Sections C and D] Sections describing the laser patterning experiments (C and D): the attribution of changes in static CA, anisotropy, and adhesion to sub-pattern morphology requires that laser processing does not differentially alter surface chemistry (oxide thickness or carbon coverage) across the pattern variants. Chemistry controls (A: adsorption monitoring; B: sputtered layers) are performed exclusively on unpatterned flats. No post-laser XPS, AES, or equivalent analysis is described on the patterned surfaces to verify that oxide states and hydrocarbon accumulation match the flat controls at the relevant measurement times. This assumption is load-bearing for the claim that topography alone enables precise tuning.

Authors: We agree that this is a valid concern and that direct verification would strengthen the topography-only attribution. Our chemistry studies (A and B) were intentionally performed on flat substrates to isolate chemical effects without topographic confounding. The laser parameters in sections C and D were selected to produce controlled ablation with minimal thermal impact, and all patterned samples were aged and measured under identical conditions to the flat controls. Nevertheless, we acknowledge the gap. In the revised manuscript we will add post-laser XPS data on representative isotropic and hierarchical patterned surfaces at the same post-processing times used for wetting measurements, confirming that oxide thickness and adventitious carbon coverage remain comparable to the flat controls. This addition will directly support the claim that observed wetting differences arise from sub-pattern morphology. revision: yes

Circularity Check

0 steps flagged

No circularity; purely experimental reporting of direct measurements

full rationale

The manuscript describes a sequence of experiments (hydrocarbon adsorption monitoring, sputter deposition of oxides on flats, ps-laser isotropic patterning, DLIP anisotropic patterning) followed by contact-angle and surface-analysis measurements. No equations, fitted parameters, predictions derived from prior fits, or self-citations are invoked as load-bearing steps in any derivation chain. All central claims are presented as outcomes of the reported measurements rather than reductions to inputs by construction. The methodological concern about whether laser processing alters chemistry is a question of experimental isolation, not a circularity issue under the defined patterns.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Minimal ledger as this is an experimental study relying on standard surface science techniques rather than new theoretical constructs.

axioms (1)

domain assumption Contact angle measurements reliably reflect the combined effects of surface energy and topography per standard wetting models.
Implicit in all reported static contact angle, anisotropy, and adhesion data.

pith-pipeline@v0.9.0 · 5849 in / 1201 out tokens · 23815 ms · 2026-05-23T02:37:52.482113+00:00 · methodology

discussion (0)

Reference graph

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