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REVIEW 3 major objections 7 minor 1 cited by

Water-rich amorphous state from drying mixed-metal sulfate solutions

T0 review · 3 major / 7 minor · reviewed 2026-08-07 · deepseek-v4-flash

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Pith's one-line read Drying mixed sulfate solutions yields a water-rich glassy state.

desk verdict Genuinely new water-rich amorphous sulfate state from drying mixed solutions, with a glass-labeling question that doesn't undermine the core observation. read the letter →

arxiv 2505.14334 v1 pith:HP5E4MWA submitted 2025-05-20 cond-mat.soft cond-mat.mtrl-sciphysics.chem-ph

Christiaan T. van Campenhout , Romane Le Dizès Castell , Tess Heeremans , Sander Woutersen , Daniel Bonn , Noushine Shahidzadeh This is my paper · ORCID
classification cond-mat.softcond-mat.mtrl-sciphysics.chem-ph
keywords amorphousmaterialssaltcrystallizationmixedsulfatesevaporativedryingglassystatewaterretentionhydrogenbondingMars
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 claims that simply letting water evaporate from mixed sulfate solutions—one monovalent cation plus one di- or trivalent cation—produces a soft, water-rich, X-ray amorphous solid that had not been recognised before. The authors show that the material forms for many cation combinations, remains stable from seconds to months depending on the cation, and traps 30–40 weight percent water in a viscoelastic matrix with a storage modulus around $10^{5}$–$10^{6}$ Pa. They attribute the suppression of crystallization to a strong hydrogen-bonding network and slow water exchange around highly charged cations, which immobilises ions before crystals can nucleate. If correct, the finding adds a new family of amorphous materials accessible through ordinary evaporation and offers a plausible explanation for amorphous sulfates observed on Mars.

What carries the argument

The mechanism proposed is kinetic frustration of nucleation: during drying, the solution concentrates until a strong hydrogen-bonding network forms and highly charged cations bind water so tightly (slow water-exchange rates) that ions lose mobility before they can organise into crystals. The central objects are the aqueous mixed-metal sulfate glass—a water-rich, X-ray amorphous, viscoelastic solid—and the empirical correlation between cation water-exchange rate kH2O and glass lifetime τglass, which ranges over orders of magnitude from seconds (Cu2+) to weeks (Al3+). This correlation is what carries the claim that cation hydration, not ionic size, controls glass stability.

What would settle it

Measure the pair distribution function from high-resolution total X-ray scattering on a freshly dried Na2SO4:FeSO4 sample: sharp Bragg peaks or crystalline correlations beyond the first few coordination shells would show the 'glassy' material is a nanocrystalline hydrate rather than a true glass, while a structureless PDF with only short-range order would support the paper's claim.

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Extended reading notes

Core claim

The central discovery is that an aqueous mixed-metal sulfate glass forms spontaneously during isothermal evaporative drying of solutions such as Na2SO4 + FeSO4, provided the salts pair a monovalent with a multi-valent cation. The resulting state is X-ray amorphous, shows no nanoscale structure in SEM, has a storage modulus of $10^{5}$ to $10^{6}$ Pa, and retains 30–40 wt% water for days. Raman spectroscopy shows sulfate ν1 broadening indicating disordered anion orientations; ATR-FTIR shows a downshift of the O–H stretch consistent with a strengthened hydrogen-bond network. The glass ultimately crystallises into a Krohnkite-type double salt (Na2Fe(SO4)2·2H2O) rather than the Bloedite phase expected from the equilibrium ternary phase diagram. Lifetime stability across cations correlates with the water-exchange rate of the multivalent cation, not ionic radius.

Load-bearing premise

The material is called a glass on the strength of an X-ray amorphous bump, featureless electron-microscope images, and soft-solid rheology, but no calorimetric glass transition or local atomic structure is measured; if the dried material is actually a nanocrystalline hydrate or a hydrated gel, the central claim of a new glassy state is weakened.

Editorial extensions

If this is right

  • A general route emerges: any sulfate mixture pairing Na+ or K+ with Cu2+, Zn2+, Mg2+, Fe2+, Fe3+ or Al3+ has a composition that dries to an amorphous state, while mixing two monovalents or two multivalents does not.
  • Glass lifetime can be tuned from seconds to months by choosing the multivalent cation, with slower water-exchange cations giving longer-lived glasses.
  • The trapped water and mechanical stiffness (G′ 10^5–10^6 Pa) are set simultaneously by the same drying process, so the material is a soft solid that still contains a third of its weight as water.
  • Final crystallization of the Na–Fe glass yields a Krohnkite-type double salt, not the equilibrium Bloedite phase, showing the amorphous state opens a different crystallization pathway.
  • The result gives a simple environmental mechanism—evaporation of mixed brines—that could account for water-rich amorphous sulfates on Mars.

Reading between the lines

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

  • The water-exchange-rate correlation implies a design rule the paper does not state explicitly: to make a long-lived amorphous sulfate at room temperature, choose the highest-charge, slowest-exchanging cation (for example Al3+ or Fe3+) and pair it with Na+; the shortest-lived glasses will come from fast-exchanging cations like Cu2+.
  • The absence of a measured glass transition suggests these are structurally arrested hydrates rather than conventional thermodynamic glasses; they may behave more like biogenic amorphous minerals or concentrated gel phases, which would make 'glass' a functional rather than thermodynamic label.
  • The same mixed-cation kinetic-arrest logic might extend to other oxyanion systems (carbonates, phosphates, nitrates) where a slow-exchanging cation plus a fast-crystallizing anion could suppress nucleation; this is testable by repeating the drying screen with those anions.
  • The Mars link could be tested by checking whether Gale-crater-like brines with Mg, Fe, and sulfate, when evaporated under low-humidity cold conditions, leave behind X-ray amorphous residues with trapped water matching remote-sensing hydration signals.
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Editorial analysis

A structured set of objections, weighed in public.

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

Referee Report

3 major / 7 minor

Summary. The manuscript reports that evaporative drying of mixed aqueous sulfate solutions containing one monovalent cation (Na+ or K+) and one di- or trivalent cation (Fe2+, Fe3+, Mg2+, Zn2+, Cu2+, Al3+) can produce a water-rich, X-ray amorphous, viscoelastic soft solid. The Na2SO4-FeSO4 system is characterized in detail with drying kinetics, SEM, XRD, rheology, confocal Raman, and ATR-FTIR; the material retains roughly 30–40 wt% water, shows a storage modulus of 10^5–10^6 Pa, remains X-ray amorphous, and eventually crystallizes into Krohnkite-type Na2Fe(SO4)2·2H2O. The authors propose that strong cation hydration and an enhanced hydrogen-bonding network inhibit crystallization, and they support this with a correlation between the lifetime of the amorphous state and literature water-exchange rates of the cations.

Significance. If the central claims hold, this is a genuinely new class of water-rich amorphous salt materials, with potential implications for glass science, salt crystallization pathways, and the interpretation of amorphous sulfates on Mars. The paper benefits from multiple independent characterization techniques applied to a directly prepared laboratory system, and the drying conditions are reported in enough detail to be reproduced. The main limitations are that the classification as a 'glass' is not supported by calorimetric or local structural evidence, and that the claimed generality rests on a small set of pre-selected cation ratios. The discovery of a water-rich amorphous solid is already valuable; the stronger glass-terminology and 'almost exclusively' claims need additional support or appropriate softening.

major comments (3)
  1. [Results and Discussion, Figures 1D, 1E, 2C] The classification of the dried material as a 'glass' (abstract and conclusion) is not established by the structural evidence presented. Figure 1D (SEM) shows no nanoscale features, Figure 1E (XRD) shows an amorphous bump, and Figure 2C shows G' = 10^5–10^6 Pa, but all three observations are also consistent with a concentrated hydrated gel or an aggregate of nanocrystalline hydrate domains; a few-nanometer crystallite size produces an XRD pattern nearly indistinguishable from an amorphous halo, and the SEM magnification is not shown to resolve such domains. To support the 'glassy state' claim, please add a calorimetric glass-transition measurement (e.g., DSC) or a local structural probe (e.g., X-ray total scattering/PDF), or revise the terminology to 'water-rich amorphous solid' throughout. The eventual crystallization of the Na–Fe material to Na2Fe(SO4)2·2H2O (Figure 4C) does not distinguish among these possibilities.
  2. [Abstract, Results and Discussion, Table 2, Methods] The abstract's 'almost exclusively yields a glassy or amorphous state' and the Results' 'for any combination … a salt ratio exists' are stronger than the data warrant. Table 2 lists only six mixtures, each at one pre-selected ratio, and the Methods state that 'all ratios given here yield the most stable amorphous state,' so the measurements demonstrate the existence of a glass-forming composition for each tested pair, not that drying of arbitrary sulfate mixtures almost always yields a glass. A systematic composition scan, or at least an explicit statement of the glass-forming composition window, is needed to support the generality claims.
  3. [Results and Discussion, Table 1] The proposed correlation between glass lifetime and water-exchange rate is based on a small, non-statistical sample. Table 1 gives τglass ranges for only five multivalent cations (Al3+, Fe2+, Mg2+, Zn2+, Cu2+), with no replicate counts or error bars, and one outlier (Fe2+) is excluded by appealing to oxidation to Fe3+ without direct speciation measurement. In addition, cation radius and kH2O are not varied independently in this set, so the conclusion that 'this water exchange rate, and not the ionic radius' controls stability is not established. Please provide quantitative lifetime data with replicates or temper the claim to a hypothesis.
minor comments (7)
  1. [Results, rheology correction] The rheology correction formula in Results is missing a division sign and parentheses: as printed, 'G = Gap 4R4 6r2d2+3r4' is not a valid equation. Please re-typeset with the correct expression.
  2. [Table 1 and Results text] Table 1 and the Results text disagree on the water-exchange rates: the table lists Fe2+ as 10^6–10^7 s−1 and Fe3+ as 10^2–10^3 s−1, while the text states 10−7 s−1 and 10−2 s−1; please correct the exponents.
  3. [Results, Raman spectroscopy] The Raman ν1 broadening is interpreted as orientational disorder of sulfate groups, but broadening can also result from concentration gradients, ion pairing, or changes in the local dielectric environment; a peak-fitting analysis or a control at an equivalent sulfate concentration would strengthen the interpretation.
  4. [Results, ATR-FTIR] The FTIR OH-stretch downshift is attributed to stronger hydrogen bonding, but the spectrum is measured during simultaneous concentration increase; please show that the downshift is not simply a concentration effect.
  5. [Figure 4D] Figure 4D relies on the equilibrium phase diagram of ref. 26, which is listed as 'manuscript submitted'; please cite a publicly available phase diagram or provide the necessary details to reproduce the red drying trajectory.
  6. [Figure 1B] Figure 1B seems to lack a scale bar; the caption does not state one. Please add a scale bar to allow the feature size to be assessed.
  7. [Throughout] The unit 'w%' should be written as 'wt%' or 'w/w%' for clarity.

Circularity Check

0 steps flagged · score 2.0 of 10

No significant circularity; the central claim rests on self-contained experimental measurements, with only minor non-load-bearing self-citations.

full rationale

The paper's central claim — that evaporative drying of mixed mono/multi-valent sulfate solutions yields a water-rich, X-ray amorphous, viscoelastic material — is supported by direct measurements: drying kinetics (Fig. 1C), SEM and XRD (Figs. 1D,E), rheology (Fig. 2C), Raman and FTIR (Fig. 3), and a cation-stability screen (Fig. 4A, Table 1). None of these quantities is fitted from the others or defined in terms of the claimed conclusion. The amorphous/glass classification is an inference from XRD and SEM, not a derivation by construction; the absence of a calorimetric glass transition or PDF data is an evidential limitation, not circularity. The paper does contain self-citations (refs. 22–23 for the rheology setup and geometric correction, and ref. 26, a submitted manuscript by the same group, for the equilibrium phase diagram), but these are methodological or supporting inputs. They do not enter the central claim as predictions, and no load-bearing step reduces to them. The claimed correlation between cation water-exchange rate and glass lifetime uses literature rate constants (ref. 28) against independently measured lifetimes; it is a post-hoc interpretation, not a fitted parameter renamed as a prediction. No self-definitional reduction, fitted-input-called-prediction, uniqueness imported from the authors, ansatz smuggled via citation, or renaming of a known result is present.

Assumptions & free parameters 1 free parameters · 6 assumptions · 0 invented entities

The paper is an experimental discovery; no model fit parameters are used. The main ledger entries are interpretive assumptions connecting spectroscopy and literature rate constants to the proposed mechanism, plus the hand-tuned cation ratios that support the generality claim.

free parameters (1)
  • Na+:M^(n+) mixing ratio = Na:Al 4:1, Na:Fe 2:1, Na:Mg 4:1, Na:Zn 5:1, Na:Cu 5:1, K:Fe 1:1
    Ratios were hand-selected to give the most stable amorphous state; the existence claim for each salt pair rests on these specific tuned ratios.
assumptions (6)
  • domain assumption All droplet weight loss during drying is water evaporation; salt mass is constant.
    Used to convert the balance trace into water and salt content and to compute the 40 weight percent trapped water in Figure 1C.
  • domain assumption The broadening of the sulfate nu1 Raman peak indicates orientational disorder of sulfate groups.
    Interpretation in Figure 3B; peak broadening can also arise from increased concentration, ion pairing, or local field variations.
  • domain assumption The downshift of the HDO O-H stretch indicates strengthening of the hydrogen-bond network.
    Standard vibrational spectroscopy interpretation used in Figure 3C.
  • domain assumption Water exchange rate constants (kH2O) from the literature govern the kinetics of dehydration of cation hydration shells in the drying droplet.
    Central to the proposed stability correlation in Table 1; assumes dilute-solution exchange rates remain relevant in the concentrated glassy state.
  • domain assumption The rheology correction formula G = Gap * 4R^4 / (6r^2d^2 + 3r^4) correctly accounts for the non-centered, partially filled gap.
    Used to convert raw rheometer moduli into G' values; sourced from a self-cited reference (refs 22 and 23).
  • domain assumption A featureless SEM image and an X-ray amorphous bump are sufficient to classify the material as amorphous or glassy.
    No DSC or pair distribution function measurement is presented; nanocrystalline or gel states would also show these signatures.

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Cite this review

Pith. "Pith review of Water-rich amorphous state from drying mixed-metal sulfate solutions." pith.science (2026). https://pith.science/paper/HP5E4MWA

@misc{pith2026250514334,
  author       = {Pith},
  title        = {Pith review of: Water-rich amorphous state from drying mixed-metal sulfate solutions},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/HP5E4MWA}},
  note         = {Machine review of arXiv:2505.14334}
}
read the original abstract

Amorphous and glassy materials are important for many advanced applications, from flexible solar cells to drug delivery systems. To this end, new glasses are in high demand, but precise chemical design of amorphous materials remains challenging. By studying the crystallization of mixed salt solutions, we have discovered an entirely new type of amorphous material: water-rich amorphous mixed sulfates. Specifically, we show that drying of sulfate salt mixtures of both mono- and higher valency cations almost exclusively yields a glassy or amorphous state, where the stability of the amorphous state depends on the cations present and ranges from seconds to months. Furthermore, we show that the glassy state is viscoelastic, behaves like a soft solid (G' 10^5 - 10^6 Pa), retains a large amount of water (30 to 40 weight percent), and is X-ray amorphous. Additionally, confocal Raman microspectroscopy reveals disordered sulfate orientations and Fourier-transform infrared spectroscopy highlights increased hydrogen bonding during drying, which together with strong cation hydration is hypothesized to prevent crystallization. These results provide insights for the production of a new class of amorphous materials, and help to elucidate the mystery of the high abundance of such amorphous salts found on Mars.

Figures

Figures reproduced from arXiv: 2505.14334 by the authors.

Figure 1
Figure 1. Drying sessile droplets of mixed sulfate solutions yields an amorphous state. A) Schematic of drying of a sessile droplet. B) Phase contrast microscopy image of an amorphous state obtained through evaporation of the ternary H2O-FeSO4-Na2SO4 system (V0 = 0.5 µL). Evaporated at 21◦C and RH < 10%. See Movie S1 for a video of the droplet drying. C) Drying kinetics of a droplet (V0 = 100 µL, m0 = 120 mg) dried on a preci… view at source ↗
Figure 2
Figure 2. Microscopy coupled rheology. A) Schematic of the setup used, where a rheometer head is placed on top of a reflection microscope to track changes in storage and loss moduli, whilst simultaneously monitoring the size and position of the droplet. B) Microscopy images of a droplet (V0 = 0.6 µL) containing FeSO4-Na2SO4 in water at three time points during the measurement. The microscopy data is used to correct the rheolo… view at source ↗
Figure 3
Figure 3. Spectroscopic analysis of the FeSO4-Na2SO4-H2O amorphous state. A) Microscopy images taken with the Raman microscope at different time points during the experiment. B) Raman spectra of an evaporating aqueous FeSO4-Na2SO4 solution at different time points, showing a clear broadening of the ν1 sulfate peak. C) Fourier-Transformed Infrared spectra of a drying FeSO4-Na2SO4 solution (in D2O) at different time points, sho… view at source ↗
Figures from the paper (1 more)
Figure 4
Figure 4. Figure 4: Amorphous state observed for a wide variety of sulfate salt mixtures. A) Mixtures of sodium and potassium sulfate with various di- and trivalent cations in water, all yielding an amorphous state during drying. Based on the mixture composition, a great difference in amo…

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Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Controlled Spherulitic Crystal Growth from Salt Mixtures: A Universal Mechanism for Complex Crystal Self-Assembly

    cond-mat.soft 2025-06 conditional novelty 7.0 of 10

    Divalent metal ions turn evaporating sodium sulfate solutions into a highly supersaturated, viscous medium in which sodium sulfate crystallizes as spherulites via two-step nucleation and diffusion-limited growth.

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