{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp12_substrate_denial72_20260805","cell_id":"modular_decomposition__chemistry_materials","arm":"CONSTRAINED_HIGH","candidate_id":"modular_decomposition__chemistry_materials__CONSTRAINED_HIGH","decision":"PROPOSAL","abstention_reason":null,"proposal":{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp12_substrate_denial72_20260805","cell_id":"modular_decomposition__chemistry_materials","arm":"CONSTRAINED_HIGH","candidate_id":"modular_decomposition__chemistry_materials__CONSTRAINED_HIGH","proposal_index":1,"version":0,"title":"Mechanically Preloaded Functional Cassettes for Layer-by-Layer Electrochemical Cell Experiments","problem":"In laboratory electrochemical flow cells, catalyst layers, porous transport media, separators, electrodes, gaskets, and current collectors are often assembled as loose layers or bonded into a single stack. Changing one material can disturb compression, alignment, wetting, contact area, or contamination across several other layers. This physical entanglement makes it difficult to replace or test one functional material while holding the rest of the cell configuration constant.","actors":["Electrochemistry researchers selecting and comparing materials","Laboratory technicians assembling and servicing cells","Catalyst-coated porous electrodes","Ion-selective separators and counterelectrodes","Electrolyte and gaseous reactant streams","Current collectors, flow fields, seals, and compression hardware"],"observable_state":"After a nominally local catalyst-layer substitution, non-target layers show changed thickness, alignment, compression marks, contact resistance, pressure drop, leakage, or wetting state; rebuilding the whole stack is required before another run can begin.","consequence":"Material effects become physically confounded with reassembly effects, intact components are repeatedly handled or discarded, and a local material change can require reconstruction and retesting of the entire cell.","affected_objective":"Permit a designated functional layer to be physically exchanged and tested with fewer collateral changes to non-target layers while preserving leak-tight fluid transport, electrical continuity, controlled compression, and whole-cell electrochemical operation.","intervention":"Decompose the electrochemical cell stack into mechanically preloaded, function-specific cassettes: a catalyst-and-porous-transport cassette, a separator cassette, a counterelectrode cassette, and reusable flow-field/current-collector modules. Each cassette uses keyed edges, chemically compatible perimeter seals, fixed-thickness hard stops, and standardized exposed fluidic and electrical contact faces. A common clamping frame supplies a repeatable mechanical datum. The target cassette can therefore be removed without opening or unloading the internal layers of the other cassettes. Physical go/no-go gauges, direct leak tests, contact-resistance measurements, and a whole-cell electrochemical check verify that the modules still compose; no software or automated control is necessary.","structural_mapping":[{"archetype_element":"Entangled whole","domain_realization":"A loose or bonded electrochemical stack in which replacing one material disturbs the compression, alignment, interfaces, and exposure history of neighboring materials."},{"archetype_element":"Responsibility partitioning","domain_realization":"Each cassette carries one coherent material function: catalytic reaction, ionic separation, counter-reaction, or fluid distribution and current collection."},{"archetype_element":"Module boundary","domain_realization":"Rigid cassette perimeters and retained internal preload physically bound which layers are disturbed during a substitution."},{"archetype_element":"Interface contract","domain_realization":"Keyed geometry, fixed face dimensions, seal lands, hard-stop thickness, exposed active-area aperture, and electrical contact pads define what may cross each boundary."},{"archetype_element":"Encapsulation","domain_realization":"Compression and registration of the layers inside a non-target cassette remain mechanically retained while another cassette is exchanged."},{"archetype_element":"Module granularity","domain_realization":"Layers that require joint compression or inseparable interfacial chemistry remain in one cassette; separable reaction, transport, and collection functions become different cassettes."},{"archetype_element":"Integration policy","domain_realization":"Dimensional fit, leak integrity, pressure drop, contact resistance, and whole-cell polarization or impedance checks determine whether the assembled cassettes still operate as one cell."},{"archetype_element":"Module stewardship","domain_realization":"A named laboratory custodian maintains each cassette type's materials-compatibility envelope, dimensions, seals, and retirement criteria."}],"mechanism_mapping":[{"mechanism_slug":"product_subsystem_decomposition","role":"Partitions the formerly monolithic experimental cell into function-specific physical subsystems whose material contents can be changed locally.","counterfactual_removal":"If the functional partition is removed, catalyst, separator, counterelectrode, and flow hardware again form one assembly whose local replacement disturbs the whole stack."},{"mechanism_slug":"mechanical_subassemblies","role":"Retaining frames, keyed edges, hard stops, and captive seals preserve each non-target cassette's geometry and preload during removal of another cassette.","counterfactual_removal":"Without the mechanical subassemblies, the design becomes another loose-layer stack; opening it releases compression and alignment throughout the cell."},{"mechanism_slug":"physical_interface_contract","role":"Standardized contact faces, apertures, seal lands, and mechanical datums allow separately retained functions to recombine into a leak-tight, conductive flow cell.","counterfactual_removal":"Without the physical interface contract, the cassettes may be locally replaceable but cannot reliably seal, conduct, align, or maintain the intended active area when recombined."},{"mechanism_slug":"direct_compatibility_check","role":"Mechanical gauges and direct fluidic, electrical, and electrochemical measurements reject assemblies whose modules do not compose.","counterfactual_removal":"Local replaceability would remain, but there would be no bounded physical test that system-level sealing, transport, contact, and reaction function survived reintegration."}],"causal_chain":["Loose or bonded layers couple a local material substitution to unloading, handling, and realignment of the entire cell stack.","Function-specific retaining frames place physical boundaries around groups of layers that must remain mechanically coherent.","Hard stops and captive registration features preserve the thickness, alignment, and preload of unopened cassettes.","Keyed fluidic, sealing, and electrical faces limit cross-boundary interactions to specified physical interfaces.","Replacing the target cassette therefore leaves the internal configuration of non-target cassettes mechanically undisturbed.","Direct compatibility tests identify interface failures before an experimental comparison is accepted.","The reassembled modules preserve whole-cell operation while making the target material cassette the principal intentionally changed physical unit."],"baseline":"A conventional bolted research flow cell assembled from individually handled loose layers, or a bonded membrane-electrode assembly that must be rebuilt or replaced as a whole when one constituent material changes.","nearest_rivals":["A conventional bolted loose-layer flow cell already permits component replacement, but unloading the clamp exposes and re-seats all layers, so non-target compression and alignment are not physically retained.","A permanently bonded membrane-electrode assembly can provide stable interfaces during a run, but changing one bonded constituent generally changes or destroys the integrated assembly.","A replaceable monolithic cell cartridge shortens service time but replaces all functions together and does not localize a material change to one coherent subsystem.","Independent ex-situ testing of catalyst, separator, or porous media avoids stack reassembly but does not test the material within the coupled transport, contact, and reaction environment of the complete cell."],"remaining_contrastive_claim":"Relative to a loose-layer bolted cell, the proposed cassettes physically retain the geometry and preload of non-target functional groups during a target-layer exchange; relative to a monolithic cartridge or bonded assembly, they preserve whole-cell testing while allowing one bounded functional group to be replaced. This is a testable architectural contrast, not a claim of novelty or superior effect size.","authority_safety":{"decision_authority":"The laboratory principal investigator or designated electrochemical-cell safety lead may authorize fabrication and bench testing within the laboratory's existing chemical, electrical, pressure, and materials-compatibility limits.","authorized_first_step":"Fabricate one low-pressure benchtop prototype and compare repeated target-cassette exchanges with repeated catalyst-layer exchanges in an otherwise matched loose-layer fixture, using only already approved aqueous electrolyte, electrode materials, gas handling, and power limits.","excluded_actions":["Pressurized operation beyond the existing fixture rating","Use of unreviewed toxic, pyrophoric, explosive, or highly corrosive reactants","Scale-up, unattended operation, or connection to production equipment","Treating a successful fit check as evidence of chemical compatibility","Changing established laboratory exposure controls or waste-disposal requirements","Inferring material performance from a run that fails leak, dimensional, or electrical compatibility checks"],"halt_rollback":"Stop on leakage, unexpected heating, arcing, swelling, seal extrusion, unstable pressure, or out-of-envelope electrical behavior. De-energize, isolate reactant flow, depressurize, drain under the approved procedure, and return to the intact conventional fixture; the prototype is removable and does not require alteration of shared laboratory infrastructure."},"negative_tests":{"strongest_counterevidence":"The cassette boundaries themselves introduce contact resistance, dead volume, leakage paths, mass-transfer discontinuities, or compression gradients large enough to dominate the material differences being studied; alternatively, opening a conventional loose-layer cell may leave non-target physical states just as stable as the retained cassettes.","problem_falsifier":"Across repeated target-layer substitutions in the baseline fixture, direct measurements show that non-target layer position, compression, contact resistance, pressure drop, leakage, and wetting-sensitive impedance remain within the same repeatability band as untouched control assemblies, indicating that whole-stack physical disturbance is not the confound claimed.","intervention_falsifier":"Compared with the matched baseline, cassette exchanges do not reduce measured changes in non-target geometry or interfaces, or the modular assembly cannot repeatedly meet the same leak, pressure-drop, contact-resistance, and whole-cell operating criteria without case-specific rebuilding.","risks":["Additional interfaces may create leakage or electrical shunting paths.","Rigid retention may produce edge stresses or nonuniform compression across fragile membranes.","Cassette materials, adhesives, or seals may swell, corrode, leach contaminants, or adsorb reactants.","Dead volume and interface gaps may change residence time or mass transport.","Retained cassettes may preserve contamination as well as desired geometry, causing carryover between experiments.","Standardized dimensions may force tightly co-designed layers apart even when their interfacial chemistry requires co-fabrication.","Researchers may over-attribute observed differences to the exchanged material despite residual changes in hydration, surface history, or assembly temperature.","Extra cassette material may increase waste and embodied material use unless frames are reusable."]},"next_evidence_step":"Run a bounded paired bench study with one cassette prototype and one matched loose-layer fixture. In each, perform a fixed sequence of target catalyst-layer removal and replacement cycles while leaving the separator and counterelectrode nominally unchanged. Before and after each cycle, directly measure registration displacement, stack thickness at fixed clamp load, pressure drop at fixed flow, leak rate, through-plane contact resistance, and a predefined whole-cell electrochemical check. Include untouched re-clamp controls and blank cassettes. The immediate decision is only whether non-target physical state is better retained without unacceptable interface penalties; material-performance superiority is outside this first step.","prior_art_status":"UNSEARCHED","diversity_from_prior_proposals":"Not assessed against other proposals because runtime isolation forbids inspecting them; this candidate is derived solely from the supplied modular-decomposition archetype and chemistry-and-materials domain card.","revision_record":{"parent_version":null,"progress_targets_addressed":["Construct one concrete chemistry-and-materials problem with an independently recognizable physical intervention.","Preserve responsibility partitioning, module boundaries, bounded interfaces, encapsulation, and reintegration checks.","Make the essential causal mechanism independent of computation, reporting, incentives, authorization, and procedural enforcement.","State serious rivals, counterevidence, falsifiers, hazards, and a bounded first experiment without novelty or effect-size claims."],"conceptual_changes":["Initial candidate; no parent revision.","Selected local material substitution in an electrochemical flow cell as the entangled-whole problem.","Realized modular decomposition as retained physical subassemblies rather than organizational or informational partitioning."],"operational_changes":["Specified function-specific cassettes, hard-stop compression datums, keyed faces, captive seals, and direct compatibility checks.","Restricted first testing to a removable, low-pressure benchtop prototype within existing laboratory limits."],"evidence_changes":["No external evidence or prior-art search used.","Defined direct measurements capable of falsifying both the problem diagnosis and the intervention mechanism."],"claim_changes":["No novelty, prevalence, demand, or effect-size claim is made.","The remaining claim is limited to whether physical retention localizes a material change relative to specified baselines."]},"substrate_contract":{"primary_allowed_process":"PHYSICAL_MATERIAL","counterfactual_independence":"The essential effect is produced by rigid boundaries, retained mechanical preload, keyed spatial registration, captive chemical seals, and standardized fluidic and electrical contact surfaces. If all software, algorithms, databases, dashboards, reporting, incentives, authorization rules, and procedural enforcement are removed, an exchanged target cassette still leaves unopened cassettes mechanically retained and still reconnects through the same physical interfaces. Manual gauges and direct instruments can characterize the result, but they do not create the localization effect.","forbidden_channel_audit":"The proposal contains no algorithmic inference, database, recommender, information-routing system, or software control loop. Governance only limits who may conduct the bounded test and supplies ordinary safety oversight. Records, training, and test procedures are not presented as the intervention. Measurements directly observe dimensions, leakage, flow resistance, electrical contact, and cell operation; no downstream analytics or reporting is required for the cassettes to retain non-target layers. Removing every forbidden wrapper leaves the mechanical decomposition and its essential local-replacement effect intact."}}}