{
    "title": "Electro-Desalination",
    "inventor_name": "Richard Crooks",
    "publication_year": 2013,
    "device_name": "WaterChip",
    "goal": "Produce fresh drinking water from seawater by removing salts using an electrochemical micro-device.",
    "problem_addressed": "High energy consumption, expensive membranes, and infrastructure requirements of conventional desalination methods.",
    "concept_summary": "A micro-fluidic chip with an embedded electrode creates an ion-depletion zone and a strong local electric field that redirects salt ions into one branch of a bifurcating channel, allowing fresh water to exit through the other branch. The process operates at low voltage (~=3 V) and can be powered by a simple battery.",
    "detailed_description": null,
    "category": "Other",
    "principles": [
        "Electrochemical field gradient",
        "Ion depletion zone formation",
        "Micro-fluidic flow control",
        "Electrophoretic ion steering",
        "Chloride oxidation at bipolar electrode"
    ],
    "scientific_domains": [
        "Chemistry",
        "Chemical Engineering",
        "Electrical Engineering",
        "Mechanical Engineering"
    ],
    "mechanisms_of_action": [
        "Applied voltage creates electric field gradient at channel junction",
        "Electrode oxidizes chloride, generating ion-depletion zone",
        "Ion-depletion zone redirects salt ions into concentrated branch",
        "Fresh water flows into dilute branch"
    ],
    "materials": [
        "Polymer (plastic) microchip",
        "Metal electrode (e.g., platinum or carbon)",
        "Fluorescent tracer (for visualization)"
    ],
    "energy_sources": [
        "Electrical power (battery, 3 V bias)"
    ],
    "inputs": [
        "Seawater (or brackish water)",
        "Electrical voltage (~3 V)",
        "Pressure-driven flow"
    ],
    "outputs": [
        "Desalinated (fresh) water",
        "Concentrated brine"
    ],
    "claimed_performance": "25 % salt removal demonstrated; device produces ~40 nanoliters of desalinated water per minute; goal of 99 % desalination and liters-per-day throughput.",
    "experimental_evidence": "Proof-of-principle experiments reported in Angewandte Chemie (2013) and US patent US2014183046 showing ion-depletion-driven salt separation in a micro-fluidic chip at 3 V bias.",
    "replication_status": null,
    "keywords": [
        "desalination",
        "electrochemical",
        "microfluidic",
        "water chip",
        "ion depletion",
        "membrane-free"
    ],
    "related_technologies": [
        "Reverse osmosis",
        "Electrodialysis",
        "Distillation"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.6,
    "fringe_score": 0.2,
    "evidence_strength": 0.5,
    "risk_score": 0.1,
    "trl_estimate": 4,
    "source_urls": [
        "http://www.utexas.edu/news/2013/06/27/chemists-work-to-desalt-the-ocean-for-drinking-water-one-nanoliter-at-a-time/",
        "http://onlinelibrary.wiley.com/doi/10.1002/anie.201302577/abstract",
        "http://www.okeanostech.com/"
    ],
    "organizations": [
        "University of Texas at Austin",
        "University of Marburg",
        "Okeanos Technologies"
    ],
    "applications": [
        "Drinking water supply",
        "Disaster-relief water generation",
        "Municipal desalination units",
        "Portable water purification"
    ],
    "limitations": [
        "Very low throughput (nanoliters per minute)",
        "Scaling to liters-per-day requires massive parallelization",
        "Electrode durability and fouling not yet demonstrated",
        "Performance demonstrated only in laboratory conditions"
    ],
    "open_questions": [
        "Can the technology be scaled to produce liters of water per day?",
        "What is the long-term stability of the electrode under continuous operation?",
        "How does the system perform with varying salinity and impurity levels?",
        "What is the total cost per liter of water including fabrication and power?"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "We have achieved 25 percent desalination.",
        "The chip contains a microchannel ... applied 3.0 volts.",
        "The device produces about 40 nanoliters of desalted water per minute.",
        "The method can run on a store-bought battery.",
        "The ion depletion zone prevents salt from passing through."
    ]
}