{"schema_version":1,"research_id":"eoa_inverse_innovation_exp06_external_evaluation_20260803","source_assessment_id":"catalytic_pathway_enablement__chemistry_materials:P3:v0","cell_id":"catalytic_pathway_enablement__chemistry_materials","search_queries":["salt hydrate phase change material supercooling heterogeneous nucleation surface insert thermal energy storage study","microstructured surface nucleation salt hydrate phase change material cycling","salt hydrate PCM nucleation metal insert surface heterogeneous nucleation","DOE thermal energy storage salt hydrate supercooling need","\"salt hydrate\" \"surface roughness\" nucleation phase change material","\"microstructured\" nucleation \"sodium acetate trihydrate\"","\"heterogeneous nucleation\" \"sodium acetate trihydrate\" surface","patent removable nucleation insert salt hydrate thermal storage","site:sciencedirect.com salt hydrate phase change \"surface\" \"nucleation\" roughness","site:springer.com salt hydrate phase change surface nucleation roughness","site:pubs.acs.org salt hydrate thermal storage heterogeneous nucleation surface","salt hydrate PCM \"nucleation surface\" thermal storage","\"SAT crystals\" \"surface grooves\" electrode nucleation","silver electrodes grooves sodium acetate trihydrate nucleation","\"physically embedded\" \"surface grooves\" sodium acetate","\"Extensive effects in supercooling and thermal energy storage density of salt hydrates\"","\"Role of Sodium Acetate Anhydrate in the Nucleation\"","\"Mutability of Nucleation Particles\" salt hydrate","\"Crystallisation studies of sodium acetate trihydrate\"","site:discovery.ucl.ac.uk \"Role of Sodium Acetate Anhydrate\"","site:research.ed.ac.uk \"Mutability of Nucleation Particles\"","site:researchportal.bath.ac.uk \"Mutability of Nucleation Particles\"","\"Mutability of Nucleation Particles in Reactive Salt Hydrate\" pdf","\"Extensive effects in supercooling\" pdf","\"Role of Sodium Acetate Anhydrate\" pdf","\"Effect of embedding sodium acetate trihydrate\" pdf","\"Electrically driven nucleation for enhanced control\" pdf","site:research.utwente.nl/en/publications \"Electrically driven nucleation\"","site:research.utwente.nl \"salt hydrate hydrogel heat release\"","site:ucl.ac.uk \"Role of Sodium Acetate Anhydrate in the Nucleation\"","site:discovery.ucl.ac.uk/id/eprint \"Sodium Acetate Anhydrate\" nucleation","\"acs.cgd.6c00865\" UCL","site:frontiersin.org/journals/materials \"Sodium acetate\" \"variable stiffness\" electrode","Frontiers Materials 2023 sodium acetate electrical nucleation fabric variable stiffness","site:illinois.edu \"Extensive effects in supercooling and thermal energy storage density\"","site:ideals.illinois.edu \"Extensive effects in supercooling\"","site:experts.illinois.edu \"Extensive effects in supercooling\""],"sources":[{"source_id":"S1","title":"Salt Hydrate Eutectic Thermal Energy Storage for Building Thermal","publisher":"U.S. Department of Energy","url":"https://www.energy.gov/cmei/buildings/articles/salt-hydrate-eutectic-thermal-energy-storage-building-thermal","source_class":"GOVERNMENT_OR_REGULATOR","publication_date":"2021-03-24","accessed_at":"2026-08-03","claims_supported":["DOE identified salt-hydrate limitations as preventing reliable building applications.","DOE expressly funded rapid screening of nucleation catalysts to decrease undercooling.","The named funder, technology manager, and Texas A&M lead performer establish an identifiable funding and research pathway.","The integrated project received $1,546,556 in DOE funding plus $386,639 cost share, providing a broad resource benchmark."]},{"source_id":"S2","title":"Understanding supercooling mechanism in sodium sulfate decahydrate phase-change material","publisher":"Oak Ridge National Laboratory / Journal of Applied Physics","url":"https://impact.ornl.gov/en/publications/understanding-supercooling-mechanism-in-sodium-sulfate-decahydrat/","source_class":"PRIMARY_RESEARCH","publication_date":"2021-06-28","accessed_at":"2026-08-03","claims_supported":["Supercooling delayed liquid-to-solid transition in sodium sulfate decahydrate.","Experiments found that adding borax nucleator decreased supercooling before nucleation.","Molecular simulations attributed delayed nucleation partly to slow charged-molecule dynamics and long-range electrostatic interactions."]},{"source_id":"S3","title":"Extensive effects in supercooling and thermal energy storage density of salt hydrates","publisher":"Applied Energy","url":"https://www.sciencedirect.com/science/article/pii/S0306261926004150","source_class":"PRIMARY_RESEARCH","publication_date":"2026-06-15","accessed_at":"2026-08-03","claims_supported":["Salt-hydrate supercooling measurements depend materially on sample mass and thermal ramp conditions.","Smaller samples had lower nucleation probability and greater supercooling uncertainty.","Phase segregation lowered measured energy-storage density, identifying an alternative failure mode that must be separated from nucleation delay."]},{"source_id":"S4","title":"Extensive Screening and Performance Testing of Nucleating Agents for the Sodium Acetate Trihydrate Phase-Change Material","publisher":"University College London / Crystal Growth & Design","url":"https://discovery.ucl.ac.uk/id/eprint/10203263/","source_class":"PRIMARY_RESEARCH","publication_date":"2024-09-26","accessed_at":"2026-08-03","claims_supported":["A gram-scale parallel instrument screened 36 candidate nucleating agents for sodium acetate trihydrate.","Calcium chloride dihydrate nucleated sodium acetate trihydrate reliably down to 0.5 wt% and remained effective over the tested temperature range.","Other nucleators lost reliability after higher-temperature exposure, supporting cycle-dependent deactivation as a real concern."]},{"source_id":"S5","title":"Mutability of Nucleation Particles in Reactive Salt Hydrate Phase Change Materials","publisher":"American Chemical Society","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC11492374/","source_class":"PRIMARY_RESEARCH","publication_date":"2024-10-07","accessed_at":"2026-08-03","claims_supported":["Passive solid particles are an established method for lowering the nucleation barrier in salt-hydrate phase-change materials.","Barium-based particles dramatically reduced undercooling in calcium chloride hexahydrate.","The particles underwent cation exchange and secondary precipitation, showing that an apparently heterogeneous surface can chemically react with the phase-change material rather than remain inert."]},{"source_id":"S6","title":"Crystallisation studies of sodium acetate trihydrate – suppression of incongruent melting and sub-cooling to produce a reliable, high-performance phase-change material","publisher":"Royal Society of Chemistry / University of Edinburgh","url":"https://www.pure.ed.ac.uk/ws/portalfiles/portal/194758565/20210209_Pulham_d0ce01454k.pdf","source_class":"PRIMARY_RESEARCH","publication_date":"2020-12-08","accessed_at":"2026-08-03","claims_supported":["Reliable salt-hydrate operation requires both nucleation control and suppression of incongruent melting.","Commercial hand-warmer disks trigger crystallization by retaining and releasing seed crystallites from submicron cracks, a close but disqualifying residual-seed analogue.","Hydrogen-phosphate nucleators can deactivate by dehydration.","A Sunamp-associated formulation achieved reported multi-thousand-cycle testing, demonstrating industry interest and a demanding durability comparator."]},{"source_id":"S7","title":"Electrically driven nucleation for enhanced control of salt hydrate hydrogel heat release in long-term thermal storage applications","publisher":"University of Twente / Journal of Energy Storage","url":"https://research.utwente.nl/en/publications/electrically-driven-nucleation-for-enhanced-control-of-salt-hydra/","source_class":"PRIMARY_RESEARCH","publication_date":"2025-01-15","accessed_at":"2026-08-03","claims_supported":["Effective discharge from supercooled sodium acetate trihydrate remains a recognized challenge.","Electrode pretreatment, voltage, spacing, and number of electrode pairs can control nucleation and heat-release distribution.","Electrical triggering is a technically demonstrated active comparator but requires recurring external actuation."]},{"source_id":"S8","title":"The use of phase change material as an actuator in linkage fabric structures","publisher":"Frontiers in Materials","url":"https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2023.1268975/full","source_class":"PRIMARY_RESEARCH","publication_date":"2023-11-27","accessed_at":"2026-08-03","claims_supported":["Roughened silver electrodes bearing embedded sodium acetate trihydrate crystals triggered crystallization under a low-voltage impulse.","Nucleation success depended on composition and electrode placement and remained substantially below 100% in the reported tests.","Sealing, evaporation, phase separation, and material degradation impaired repeated cycling, reinforcing the need for complete-reset and compatibility assays.","The roughened seeded electrode is close prior art but differs by relying on embedded seed crystals and electrical actuation."]}],"problem_evidence":{"support":"STRONG","rationale":"Independent experimental and official sources consistently show that salt hydrates can remain metastably liquid, delaying or preventing scheduled heat release, and that nucleation control is a material engineering priority. DOE states that inherent salt-hydrate limitations prevent reliable building applications and specifically funded nucleation-catalyst screening. The candidate nevertheless omits the exact salt-hydrate formulation and any module-specific measurements, so prevalence, onset distribution, and whether nucleation rather than heat transfer or phase segregation is rate-limiting remain unverified for the proposed module.","source_ids":["S1","S2","S3","S4","S6","S7"]},"stakeholder_evidence":{"support":"STRONG","rationale":"DOE is an identifiable funder that committed funding to a named Texas A&M program explicitly including nucleation catalysts; its stated end use is building thermal-load shifting. Sunamp participated in the sodium-acetate formulation research reported in S6 and performed extended heat-battery cycling. These establish expressed institutional and industrial need, although neither source commits to adopting this particular removable insert.","source_ids":["S1","S6"]},"prior_art":{"proximity":"ADJACENT_PRIOR_ART","closest_analogues":[{"name":"Dispersed solid nucleating agents for salt-hydrate PCMs","similarity":"Passive heterogeneous solid surfaces reduce the nucleation barrier and can remain present through repeated melt-freeze cycles.","remaining_difference":"The particles are dispersed in and may react with the formulation; they are not a separately recoverable, seed-free microtextured insert with independently verified reset and mass retention.","source_ids":["S2","S4","S5","S6"]},{"name":"Seed-retaining metal trigger disk","similarity":"A reusable textured metal object initiates sodium acetate trihydrate crystallization over repeated uses.","remaining_difference":"Its accepted mechanism is retention and mechanical release of seed crystallites in surface cracks, expressly failing the proposal's complete-melt, no-residual-seed, and no-repeated-manual-input conditions.","source_ids":["S6"]},{"name":"Roughened seeded silver electrodes","similarity":"A controlled solid interface, surface preparation, placement, and repeated crystallization are central to performance.","remaining_difference":"The electrodes contain embedded SAT crystals and require an applied electric field; the proposed insert claims passive activity after analytically verified complete melting and without seed retention.","source_ids":["S7","S8"]},{"name":"Electrically triggered multi-electrode salt-hydrate storage","similarity":"Provides controlled nucleation and measures crystallization time and heat-release distribution in supercooled SAT.","remaining_difference":"It consumes electrical actuation each discharge and is not evidence that microtexture alone supplies a repeatable, chemically inert nucleation surface.","source_ids":["S7"]}],"distinctive_claim_remaining":"For one explicitly specified salt-hydrate formulation and operating window, a separately identifiable insert with predeclared base material, surface chemistry, and microtexture will, without applied voltage, mechanical actuation, retained seed crystal, material transfer, deeper cooling, or formulation change, outperform both no-insert and composition-matched smooth-insert controls on intended-phase nucleation probability and onset timing for at least 12 independently complete-melt-reset cycles while preserving phase identity, latent-heat output, pressure, corrosion, leaching, and insert integrity limits.","confidence":"MODERATE"},"implementation_evidence":{"support":"MODERATE","rationale":"The literature establishes feasible sealed-cell cycling, calorimetry, phase analysis, passive nucleating solids, roughened electrodes, and active electrical comparators. It also shows that composition, sample volume, thermal history, placement, surface reactions, phase segregation, sealing, and nucleator deactivation can dominate results. No source directly demonstrates the proposal's exact passive, seed-free, removable microtextured insert after verified complete melting. The exact formulation, insert material, texture dimensions, coating, wetting behavior, corrosion compatibility, fabrication tolerances, and analytical thresholds are unspecified. Legal authority is plausibly limited to institutional laboratory and EHS authorization for the proposed probe; building or human-service deployment would require separate review not established by these sources.","source_ids":["S2","S3","S4","S5","S6","S7","S8"]},"scores":{"meaningful_impact":{"score":3,"rationale":"Predictable latent-heat release matters for thermal storage and DOE identifies reliable salt-hydrate operation as a building application barrier, but the candidate has no target-module prevalence or system-level impact data.","source_ids":["S1","S2","S7"]},"stakeholder_pull":{"score":4,"rationale":"DOE expressly funded nucleation-catalyst work and Sunamp participated in durability-oriented heat-battery research; pull for the problem is clear even though pull for this insert is not.","source_ids":["S1","S6"]},"incremental_advantage":{"score":3,"rationale":"A passive recoverable insert could avoid dispersed additives and repeated electrical or mechanical triggering, but no measured advantage exists yet and the surface may merely conceal retained seed or reactive material.","source_ids":["S5","S6","S7","S8"]},"distinctiveness_plausibility":{"score":3,"rationale":"The no-residual-seed, no-actuation, separately assayable reset condition is contrastive and testable, but passive nucleating solids and textured triggering interfaces are already mature adjacent art.","source_ids":["S4","S5","S6","S8"]},"technical_implementability":{"score":3,"rationale":"The proposed cell experiment uses established thermal cycling and characterization methods, but activity, selectivity, chemical inertness, and regeneration of the unspecified insert remain empirical unknowns.","source_ids":["S3","S4","S5","S6"]},"adoption_authority_feasibility":{"score":3,"rationale":"DOE, Texas A&M, and an industry participant are identifiable pathway actors, and a bounded institutional laboratory can authorize a sealed-cell study. No committed host laboratory, EHS approval, formulation owner, or deployment authority is identified.","source_ids":["S1","S6"]},"evidence_readiness":{"score":3,"rationale":"Comparators, endpoints, and strong falsifiers can be predeclared, but candidate-specific surface and formulation specifications must be frozen before evidence is interpretable.","source_ids":["S3","S4","S6","S8"]},"safety_net_benefit":{"score":2,"rationale":"More reliable low-temperature storage could support building resilience and load shifting, but no evidence targets vulnerable users, essential services, or distributional benefits.","source_ids":["S1"]},"scalability":{"score":2,"rationale":"Fabricable inserts could in principle scale, but nucleation probability is volume-dependent and small-cell geometry, heat flow, sealing, phase segregation, and localized release may not transfer to modules.","source_ids":["S3","S7","S8"]}},"score_confidence":"MODERATE","costs":{"first_evidence":{"band_2026_usd":"50K_TO_250K","scope":"Freeze one formulation and two insert geometries; fabricate 12 candidate/control inserts; prepare no more than 15 sealed cells; execute up to 180 cell-cycles; perform thermal, phase, surface, mass-loss, corrosion, and leaching measurements; and complete EHS documentation and analysis.","confidence":"MODERATE","assumptions":["An academic or industrial partner already owns programmable thermal-cycling, calorimetry, pressure sensing, microscopy, and X-ray diffraction access.","The study uses an already-approved formulation and laboratory envelope.","Approximately 0.5 to 1.0 combined scientist/technician FTE is required for three to six months.","No custom pressure-rated module or new capital-scale calorimeter is purchased."],"source_ids":["S1","S3","S4","S6"]},"initial_deployment_startup":{"band_2026_usd":"250K_TO_1M","scope":"Advance a successful cell result to a submodule prototype with repeatable insert fabrication, sealing, sensor integration, accelerated cycling, compatibility qualification, quality-control methods, and hazard review.","confidence":"LOW","assumptions":["One formulation and one insert architecture are selected after the probe.","Existing pilot fabrication and analytical facilities can be rented or partnered rather than built.","The estimate excludes occupied-building connection, product certification, and production tooling."],"source_ids":["S1","S6","S7","S8"]},"operational_launch":{"band_2026_usd":"1M_TO_5M","scope":"Establish pilot production and inspection of inserts, module-scale durability and safety testing, application-specific controls, supply-chain qualification, documentation, and a limited field demonstration.","confidence":"LOW","assumptions":["Launch means limited operational demonstration rather than mass-market manufacture.","No new building-scale manufacturing plant is included.","Exact certification and pressure-vessel obligations depend on the still-unspecified formulation and end use."],"source_ids":["S1","S6"]},"annual_recurring":{"band_2026_usd":"250K_TO_1M","scope":"Support pilot-scale quality assurance, insert inspection and replacement, formulation assays, accelerated surveillance cycling, incident review, analytical testing, and one small technical operations team.","confidence":"LOW","assumptions":["Hundreds to low thousands of pilot inserts or modules are supported annually.","Analytical infrastructure remains shared or contracted.","Recurring costs exclude bulk PCM production, building HVAC equipment, and energy used by customer systems."],"source_ids":["S1","S6"]}},"verified_pipeline_gates":{"externally_supported_problem":{"status":"YES","reason":"Official and experimental sources independently establish supercooling, delayed heat release, and nucleation reliability as material barriers in salt-hydrate thermal storage.","source_ids":["S1","S2","S3","S4","S6","S7"]},"externally_credible_adopter_or_authorizer":{"status":"YES","reason":"DOE is an identified funder with a named technology manager and lead performer, and Sunamp is an industry participant in closely related formulation and durability work. Commitment to this insert remains absent, but a credible funder and adoption pathway exist.","source_ids":["S1","S6"]},"distinct_testable_incremental_claim":{"status":"YES","reason":"The passive, seed-free, separately recoverable, complete-melt-reset claim can be tested against no-insert, smooth-insert, and active or seeded rival controls with phase, mass-transfer, and cycle endpoints.","source_ids":["S4","S5","S6","S7","S8"]},"bounded_next_evidence_step":{"status":"YES","reason":"A 15-cell, maximum-12-cycle matched probe is bounded in cell count, cycles, comparators, measurements, authorization envelope, and kill criteria.","source_ids":["S3","S4","S6","S8"]},"no_unresolved_safety_or_authority_stop":{"status":"UNCERTAIN","reason":"A sealed low-volume study is ordinarily governable through laboratory and EHS authority, but the exact formulation, insert chemistry, pressure limits, corrosion/leaching thresholds, host institution, and approval status are unspecified. Sources document reactivity, leakage, evaporation, and degradation risks.","source_ids":["S5","S6","S8"]},"credible_cost_scope_and_range":{"status":"UNCERTAIN","reason":"The bands are scoped resource-equivalent estimates anchored only broadly by a DOE research program and published laboratory workflows. No partner quote, labor plan, instrument-access rate, insert fabrication quote, or deployment specification is available.","source_ids":["S1","S3","S4","S6"]}},"next_evidence_step":"With a named laboratory partner and EHS approval, preregister and run no more than 15 sealed low-volume cells from one homogenized, already-approved formulation lot: triplicate no-insert cells, triplicate smooth inserts of the same base material, six microtextured inserts covering two frozen geometries, and triplicate cells using one already-authorized active or seeded rival. Randomize cell position and run no more than 12 identical melt-cool-hold-reset cycles per cell. Verify complete bulk melting and absence of retained target-phase seed before every reset. Primary endpoints are intended-phase nucleation probability within the existing acceptance window and onset-time/onset-temperature distribution. Secondary endpoints are heat-flow profile, fraction crystallized, phase identity, spatial temperature, pressure, insert mass and surface change, corrosion/leaching, reset success, and operator intervention. Falsify the claim if the microtextured insert does not outperform both no-insert and smooth controls under matched thermal histories; if its apparent effect disappears after complete-melt verification; if retained crystals, voltage, mechanical input, deeper cooling, or material transfer are required; or if wrong phase, heat-flow, pressure, corrosion, leaching, or integrity limits are breached. Treat the 12-cycle result only as an attributable feasibility test, not lifetime qualification.","blocking_evidence":["Exact salt-hydrate formulation, water content, target crystalline phase, acceptance window, and relevant impurity limits are not specified.","Insert base material, surface chemistry, microtexture dimensions, coating process, placement, surface-area loading, and manufacturing tolerances are not specified.","No direct evidence shows passive seed-free nucleation after analytically verified complete melting.","No chemical-compatibility, corrosion, leaching, wetting, retained-crystal, fracture, or particle-shedding data exist for the candidate insert.","No named laboratory partner, formulation owner, EHS authorization, apparatus availability, or downstream heat-acceptance limit is documented.","No candidate-specific cost quote or labor and instrument-access plan exists.","Small-cell nucleation behavior may not transfer to module volumes and thermal gradients.","World novelty, patentability, freedom to operate, market size, and realized impact remain unmeasured."],"research_disposition":"PARTNERED_RESEARCH_PROGRAM","world_novelty_boundary":"The bounded search found established dispersed nucleators, seed-retaining trigger disks, roughened seeded electrodes, active electrical triggering, and cycle-stable salt-hydrate formulations, but did not establish an exact published match for a passive, seed-free, separately removable microtextured insert with analytically verified complete-melt reset. This is not a world-novelty, patentability, freedom-to-operate, market-size, or realized-impact determination; no comprehensive patent or non-English literature search was performed.","arm":"COMPLETE_PROPOSAL_PORTFOLIO","candidate_version":0,"controller_recommendation":{"action":"STOP_EMPIRICAL_RESEARCH_NEEDED","repairable":false,"material_progress_observed":true,"progress_targets":["Freeze the exact formulation, target phase, operating window, and analytical acceptance criteria.","Freeze insert material, surface chemistry, texture geometry, surface-area loading, placement, and fabrication tolerances.","Secure a named laboratory partner, apparatus access, formulation authorization, and written EHS approval.","Preregister the 15-cell matched-control protocol, randomization, complete-melt assay, endpoints, and kill thresholds.","Generate cycle-resolved evidence that activity survives complete melting without seed retention, material transfer, voltage, mechanical triggering, deeper cooling, or relaxed phase criteria.","Obtain partner-based labor, instrument, fabrication, analytical, and submodule cost quotes before revising deployment bands."],"reason":"Web evidence verifies the problem, stakeholder need, adjacent prior art, feasible measurement methods, and a bounded experiment. The remaining incremental claim is inherently candidate-specific and can only be resolved by fabrication, chemical-compatibility work, and live controlled thermal cycling; additional bounded web search cannot determine whether the proposed surface nucleates selectively, remains inert, or resets after complete melting."},"proposal_index":3}