What is active wetting?

Uwe Thiele

What is active wetting?

T0 review · 0 major / 3 minor · reviewed 2026-08-03 · deepseek-v4-flash

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Pith's one-line read The paper proposes restricting the term “active wetting” to wetting phenomena in active liquids, where chemo-mechanical coupling happens at the level of the microscopic bulk constituents, and placing biofilms and purely diffusive condensate

desk verdict A genuinely useful, openly hedged taxonomy for a term that badly needed one—well worth a serious referee. read the letter →

arxiv 2602.10287 v2 pith:GCXGREEY submitted 2026-02-10 cond-mat.soft

Uwe Thiele This is my paper · ORCID

classification cond-mat.soft

keywords activewettingclassificationreactiveliquidschemo-mechanicalcouplingBrownianparticlescellmonolayerstransitions

verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

This paper proposes a working answer to a question that has spread faster than its definition: what counts as “active wetting”? It sets up a coarse classification of wetting phenomena — equilibrium, relaxational, driven, and reactive — and then argues that the label “active wetting” should be reserved for wetting phenomena involving active liquids, meaning systems whose chemo-mechanical coupling operates at the level of the microscopic bulk constituents (self-propelling particles or active stresses). Under that rule, cell monolayers, cell aggregates, and active Brownian-particle layers count; biofilms and purely diffusive biomolecular condensates should instead be called reactive wetting. The paper stresses that the boundary between categories is not fixed but shifts with the level of description chosen.

What carries the argument

The key object is a four-category taxonomy of wetting — equilibrium, relaxational, driven, reactive — used as the backdrop, plus the single discriminating criterion for active wetting: the location of chemo-mechanical coupling (“on the level of the microscopic bulk constituents”). The argument works by surveying the experimental and theoretical systems for which the term “active wetting” is used, showing they split along this line, and then admitting that the line depends on the level of description. The taxonomy itself is the device that makes the definition stateable.

What would settle it

A concrete observation that would undermine the definition: identify a system currently called active wetting (for instance a spreading cell monolayer) whose behaviour is fully reproduced by a model with no bulk-level active stresses — only boundary reactions and passive bulk rheology. If such a system nonetheless shows the characteristic active wetting transitions (e.g., a substrate-stiffness-dependent wetting transition with an intrinsic length scale), then the microscopic-bulk-coupling criterion is not doing the classificatory work claimed.

Watch

Extended reading notes

Core claim

The paper's central claim is a tentative definition: it “could be a clarifying restriction to use the term active wetting only for wetting phenomena involving active liquids, i.e., where the chemo-mechanical coupling takes place on the level of the microscopic bulk constituents.” From this it follows that the category includes the (de)wetting of cell monolayers and aggregates, dense layers of active Brownian particles, and sessile drops of active liquids, while excluding proliferating biofilms and biomolecular condensates described by purely diffusive transport, which fall under reactive wetting. The definition is offered with explicit caveats: the same physical system may appear as active w

Load-bearing premise

The load-bearing premise is that there is a stable, meaningful distinction between chemo-mechanical coupling at the level of the microscopic bulk constituents and couplings that act at other levels — even though the paper itself shows that a single system can be classified either way depending on whether it is described microscopically or via a coarse-grained nonreciprocal field theory.

Editorial extensions

If this is right

If the proposed definition catches on, the wetting of biofilms and of purely diffusive condensates will be re-labelled as reactive wetting, removing a current source of ambiguity.
The classification gives researchers a shared vocabulary that should make it easier to map contact-angle laws and wetting-transition results across active, reactive, driven, and equilibrium cases.
It exposes “active equilibrium wetting” as a contradictory phrase, since active systems are permanently out of equilibrium; that phrase should be replaced by a description of stationary non-equilibrium states.
The caveat about description level implies that any experimental claim of “active wetting” should specify whether the microscopic constituents are indeed self-propelling or stress-generating, rather than just out of equilibrium.
The list of phenomena surveyed suggests that systematic comparative studies across systems will be needed to extract general laws of dynamic active wetting.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

A natural test: take a system that can be modelled both as active Brownian particles and as a nonreciprocal continuum field theory, compute the wetting layer thickness or contact angle in both, and see whether the difference is quantitative or qualitative; if qualitative, the active/reactive distinction may be more than a modelling choice.
The criterion might be sharpened by asking whether the chemo-mechanical coupling survives a coarse-graining that keeps the same hydrodynamic variables; if it disappears, the system is arguably reactive at the macroscale.
One could imagine an experimental protocol: measure the strength of interface currents (stationary density fluxes) in a wetting layer; if currents are driven by bulk constituent motility rather than by boundary reactions, the phenomenon would be active by the proposed definition.
The paper's own caveat hints that the taxonomy is a pragmatic tool, not an ontology; a future synthesis might replace the binary active/reactive label with a parameter describing the scale at which energy injection couples to mechanics.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Desk Editor's Note

read the letter

Thiele's perspective does what it sets out to do: it maps the muddy usage of 'active wetting' and proposes a workable definition. The four-part distinction (equilibrium, relaxational, driven, reactive) is a new organizational frame, and the suggestion to reserve 'active wetting' for wetting by active liquids—where chemo-mechanical coupling lives on the microscopic bulk constituents—is concrete enough to test against cases. The paper is also honest to a fault: it repeatedly points out where categories blur, and it explicitly acknowledges that the same system can be active wetting at one level of description and reactive wetting at another. That self-awareness is the strongest thing about it.

What it does well: the survey is broad and current (Joanny's actin cortex, cell aggregates, ABPs, condensates, biofilms), and the examples are tied to concrete laws (Young, Tanner, Cox-Voinov, Landau-Levich). No new data or derivations, but for a perspective that is not a flaw.

Soft spots, in proportion: the classification is ultimately a convention, not a discovery. The active/reactive boundary is level-dependent, as the paper concedes; that means the definition will help people communicate, but it won't settle any empirical question by itself. The phrase 'microscopic bulk constituents' is not sharply operationalized—what counts as microscopic, and whose chemo-mechanical coupling? The paper waves at that but doesn't resolve it. Also, the categories overlap with old terms (forced wetting, reactive wetting), so a skeptical reader may wonder whether the taxonomy is replacing one fuzzy term with four fuzzy ones. That is the real limit, and the paper would be stronger if it spent a paragraph on how one would falsify or at least disprefer the proposed definition.

Bottom line: the reader's take is fair. The center holds because the paper frames the proposal as provisional and invites debate. I would send it to a serious referee. It won't change anyone's physics, but it should sharpen how the field talks about active wetting—and that's the point. I would cite it if I were writing about active droplets or wetting transitions.

Referee Report

0 major / 3 minor

Summary. This perspective proposes a coarse taxonomy of wetting phenomena as a way to give a tentative definition of the term "active wetting," which has been used increasingly in the literature without a clear meaning. The author first distinguishes four categories for passive liquids: equilibrium wetting (Section II), relaxational wetting (Section III), driven wetting (Section IV), and reactive wetting (Section V). Section VI then surveys a broad range of recent works that call various phenomena "active wetting," including cell aggregates, epithelial monolayers, biofilms, biomolecular condensates, active Brownian particles, and active liquid drops. The central proposal, presented in Section VII, is to reserve "active wetting" for wetting phenomena involving active liquids, i.e., cases in which chemo-mechanical coupling takes place on the level of the microscopic bulk constituents; under this restriction, biofilms and purely diffusive condensates would fall instead under reactive wetting. The author explicitly stresses that any such classification depends on conceptual idealizations and the chosen level of description, and that the boundary between active and reactive wetting is not intrinsic to the system.

Significance. The paper addresses a real terminological problem in a rapidly growing interdisciplinary field. Its contribution is conceptual rather than quantitative: it offers a coherent framework, a detailed literature mapping, and a specific, falsifiable proposal for what should and should not be called active wetting. The main strength is the explicitly hedged framing: the proposed definition is presented as a clarifying restriction with named caveats, not as a natural-kind statement. The author openly acknowledges the level-of-description ambiguity (Section VII), which is the most serious objection one could raise, and makes a practical recommendation to always clarify the level of description. If accepted, the taxonomy would help standardize discussions across soft-matter physics, biophysics, and active-matter research. The absence of overreach is commendable: the paper does not claim to settle the issue, but to provide a usable starting point. The breadth of references and the careful delineation of overlaps and edge cases make this a useful reference for the community.

minor comments (3)

[Section VII] The proposed definition hinges on the phrase "chemo-mechanical coupling takes place on the level of the microscopic bulk constituents," but "microscopic" is not operationalized. For example, cell aggregates consist of cells that are mesoscopic, not microscopic. Consider clarifying that "microscopic" means "on the scale of the active constituents" (whether molecules, particles, or cells) and explicitly recommend a preferred level of description when using the taxonomy. This would sharpen the central proposal without changing its tentative character.
[Section III, IV, VI, VII] Typos: "chanels" in Section III, "V oinov" in Section IV, "controll parameters" in Section VI, and "mayor difficulties" in Section VII should be corrected to channels, Voinov, control parameters, and major difficulties.
[References] References [107] and [123] appear to be the same article (Morris and Yap, "Wetting by living tissues") with different years (2019 vs. 2018). Please verify and correct the duplicate or the years.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the central claim is an explicitly tentative definitional proposal, not a derived prediction.

full rationale

The paper is a perspective that proposes a classification of wetting phenomena and a tentative definition of active wetting. There are no fitted parameters, no equations, and no prediction that is statistically or constructively forced by an input. The central proposal in Section VII — restricting 'active wetting' to wetting by active liquids with chemo-mechanical coupling at the level of microscopic bulk constituents — is presented as a suggestion ('it could be a clarifying restriction') and is explicitly hedged. The author acknowledges that the active/reactive boundary is level-dependent, noting that 'a system could show active wetting when described microscopically via active Brownian particles and run-and-tumble particles and reactive wetting when described macroscopically via a coarse-grained nonreciprocal field theory.' This is not a hidden circular step; it is an open limitation. Self-citations appear throughout, but they are used as illustrative examples of prior modeling work rather than as load-bearing proof of the proposed definition. No uniqueness theorem or ansatz is imported from the author's own prior work to force the conclusion. The paper's contribution is a stipulative taxonomy, and its caveats prevent the definition from being circular.

Assumptions & free parameters 0 free parameters · 3 assumptions · 0 invented entities

The central proposal rests on the prior notion of 'active liquids' and on the assumption that a coarse taxonomy is useful even though the paper acknowledges its boundaries depend on idealizations. No free parameters or invented entities.

assumptions (3)

domain assumption Active liquid is defined as liquid consisting of self-propelled constituents and/or featuring active stresses resulting from properties of the constituents.
The proposed definition of active wetting relies on this prior notion, citing Refs. [16-19], but the exact boundary of 'active liquid' is not formalized.
domain assumption The classification into equilibrium, relaxational, driven, and reactive wetting is meaningful and covers the relevant phenomena.
The paper accepts that boundaries depend on idealizations and can be ambiguous (Section VII), yet still uses them as the basis for the definition.
ad hoc to paper The level of description (microscopic bulk constituents vs. coarse-grained field) is a stable criterion to decide 'active' vs 'reactive' wetting.
The author explicitly proposes this criterion and immediately notes in Section VII that the same system can be classified differently at different description levels.

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Cite this review

Pith. "Pith review of What is active wetting?." pith.science (2026). https://pith.science/paper/GCXGREEY

@misc{pith2026260210287,
  author       = {Pith},
  title        = {Pith review of: What is active wetting?},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/GCXGREEY}},
  note         = {Machine review of arXiv:2602.10287}
}

read the original abstract

In recent years the term \textit{active wetting} has gained some traction in works describing, analyzing and modeling a wide variety of wetting phenomena, for instance, in the contexts of biomolecular condensates, of cell layers or cell aggregates, and of active Brownian particles. The present perspective discusses a coarse classification of wetting phenomena that accounts for this. First, different categories of static and dynamic wetting of passive liquids are briefly introduced, in particular, distinguishing equilibrium wetting, relaxational wetting, driven wetting, and reactive wetting. Second, an overview is given of the various phenomena recently described as active wetting. We conclude by discussing a possible definition of active wetting together with a number of caveats that one might want to keep in mind when using such classifications.

Figures

Figures reproduced from arXiv: 2602.10287 by the authors.

**Figure 3.** FIG. 3: Sketches of driven wetting: (a) drop sliding down an incline, [PITH_FULL_IMAGE:figures/full_fig_p002_3.png] view at source ↗

**Figure 2.** FIG. 2: Sketches of relaxational wetting: (a) spreading drop (b) [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗

Figures from the paper (2 more)

**Figure 4.** Figure 4: FIG. 4: Sketches of reactive wetting: (a) moving drop self-propelled [PITH_FULL_IMAGE:figures/full_fig_p003_4.png]

**Figure 5.** Figure 5: FIG. 5: Sketches of active wetting: (a) static active wetting layer at [PITH_FULL_IMAGE:figures/full_fig_p004_5.png]

Discussion (0). Continue with ORCID to comment.

Forward citations

Cited by 1 Pith paper

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