{
    "title": "Electricity vs Fire",
    "inventor_name": "Ludovico Cademartiri",
    "publication_year": 2011,
    "device_name": "Electric Beam Fire Extinguisher",
    "goal": "Extinguish flames quickly and without water by applying high-voltage electric fields.",
    "problem_addressed": "Fire suppression that reduces water usage and damage, especially in confined spaces such as submarines, ships, and buildings.",
    "concept_summary": "A high-voltage, time-varying electric field is applied to a flame via a wand-like probe. Charged soot particles in the flame become unstable under the altered electric field, causing rapid flame extinction. The system can be powered by a 600-W amplifier, with potential for lower-power portable versions.",
    "detailed_description": "The Harvard team built a 600-W amplifier connected to a metal wand probe. When the probe delivers an oscillating gradient electric field (up to ~20 kV) to a flame taller than one foot, the flame is extinguished almost instantly. Experiments show that the probability of extinction depends on field frequency, voltage, and electrode distance. The mechanism is attributed to charging soot particles, which respond to the electric field and destabilize the combustion zone. The invention can be mounted on ceilings, carried in a backpack, or integrated into existing sprinkler systems. Funding came from DARPA and the U.S. Department of Energy.",
    "category": "Electromagnetism & Magnetism",
    "principles": [
        "High-voltage electric field application",
        "Oscillating gradient electric fields",
        "Charging of soot particles",
        "Electric field-induced flame instability"
    ],
    "scientific_domains": [
        "Physics",
        "Chemistry",
        "Electrical Engineering"
    ],
    "mechanisms_of_action": [
        "Soot particle charging",
        "Electric field gradient affecting flame stability",
        "Oscillating electric field causing rapid flame quenching"
    ],
    "materials": [
        "Metal electrode",
        "Platinum electrode",
        "Carbon soot (generated in flame)",
        "Insulating wand housing"
    ],
    "energy_sources": [
        "Electrical power (600 W amplifier, high-voltage supply)"
    ],
    "inputs": [
        "Electrical energy (high-voltage AC)",
        "Target flame"
    ],
    "outputs": [
        "Extinguished or suppressed flame",
        "Reduced heat output"
    ],
    "claimed_performance": "Extinguishes a >1-foot-tall open flame almost instantly using a 600-W amplifier; authors suggest a tenth of that power (~60 W) could achieve similar results.",
    "experimental_evidence": "Demonstrations on open flames taller than one foot, repeated trials showing immediate extinction; figures showing probability of extinction versus frequency, voltage, and electrode distance.",
    "replication_status": null,
    "keywords": [
        "fire suppression",
        "electric field",
        "flame extinguishing",
        "soot charging",
        "oscillating gradient",
        "portable fire extinguisher"
    ],
    "related_technologies": [
        "Water sprinkler systems",
        "Foam and powder fire suppressants",
        "Electric arc fire extinguishers"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.7,
    "fringe_score": 0.2,
    "evidence_strength": 0.6,
    "risk_score": 0.2,
    "trl_estimate": 5,
    "source_urls": [
        "http://www.gizmag.com/electricity-used-to-fight-fires/18246/",
        "http://portal.acs.org/portal/acs/corg/content?_nfpb=true&_pageLabel=PP_ARTICLEMAIN&node_id=222&content_id=CNBP_026931&use_sec=true&sec_url_var=region1&__uuid=cd081c4c-070d-4082-8632-77176da17080",
        "http://gmwgroup.harvard.edu/",
        "http://patentscope.wipo.int/search/en/detail.jsf?docId=WO2013052171A2"
    ],
    "organizations": [
        "Harvard University",
        "U.S. Department of Defense (DARPA)",
        "U.S. Department of Energy"
    ],
    "applications": [
        "Firefighting in confined environments (submarines, ships, buildings)",
        "Portable backpack fire-taming devices",
        "Ceiling-mounted sprinkler replacements",
        "Improving combustion efficiency in engines and welding torches"
    ],
    "limitations": [
        "Effectiveness limited to confined spaces; not suitable for large open-area fires",
        "Requires high-voltage equipment and safety precautions",
        "Power consumption may be significant for large-scale deployment"
    ],
    "open_questions": [
        "Optimal frequency and voltage for different fuel types",
        "Minimum power required for reliable extinction",
        "Long-term durability of electrodes in harsh fire environments",
        "Scalability to multi-flame or large-area fire scenarios"
    ],
    "red_flags": [
        "High-voltage safety concerns for operators",
        "Potential for electrical hazards if used near conductive structures"
    ],
    "evidence_quotes": [
        "Almost immediately, the flame was extinguished.",
        "The device consisted of a 600-watt amplifier, or about the same power as a high-end car stereo system.",
        "Soot particles can easily become charged. The charged particles respond to the electric field, affecting the stability of flames.",
        "The probability of extinction, P, and the angle of deflection as a function of frequency in Hertz for the voltage V=20 kV applied to an electrode.",
        "A power source with only a tenth of this wattage could have similar flame-suppressing effect."
    ]
}