{
    "title": "Nano-Silver Manufacture Patents",
    "inventor_name": null,
    "publication_year": null,
    "device_name": "High-Voltage Water Electrolysis System",
    "goal": "Mass-produce nanosilver particles (<=5 nm) and apply them to synthetic fibers to create antibacterial textiles.",
    "problem_addressed": "Need for large-scale, cost-effective production of nanosilver with high antibacterial efficacy and reliable coating on fibers.",
    "concept_summary": "A water electrolysis apparatus applies a DC voltage of 10 000-300 000 V across two silver electrodes immersed in water. By moving a circuit breaker to restrict the current to a minute level, silver ions are reduced to nanoscale particles (1-5 nm). The resulting colloidal nanosilver solution is then applied to synthetic fibers by spraying, coating or dipping, followed by thermal fixation, high-frequency radiation, bubbling or combinations thereof, and a post-finishing step at 160-200  deg C to produce antibacterial fiber.",
    "detailed_description": "The invention describes a water-based electrolysis cell where two Ag electrode plates are placed on opposite sides of a water reservoir. A DC power source supplies 10 000-300 000 V. A movable circuit breaker divides the reservoir, allowing precise control of the micro-current despite the high voltage. This controlled current limits silver ion reduction to nucleate nanosilver particles of <=5 nm. The aqueous nanosilver solution (10-100 ppm) is applied to scoured synthetic fibers; the fibers are then subjected to a fixation process (thermal, RF, or bubbling) and a final heat treatment (160-200  deg C). The coated fiber contains 0.01-0.1 g nanosilver per 100 g fiber and exhibits >99.9 % antibacterial activity within 5 minutes of contact.",
    "category": "Nanotechnology",
    "principles": [
        "High-voltage electrolysis",
        "Micro-current control via circuit breaker",
        "Nucleation and growth inhibition of silver nanoparticles",
        "Adsorption of nanoparticles onto polymer fibers",
        "Thermal or RF fixation"
    ],
    "scientific_domains": [
        "Materials Science",
        "Nanotechnology",
        "Electrochemistry",
        "Chemistry",
        "Textile Engineering"
    ],
    "mechanisms_of_action": [
        "Electrical reduction of Ag^+ ions to metallic Ag nanoparticles",
        "Size-controlled nucleation under limited current",
        "Surface adsorption of nanosilver onto fibers",
        "Release of Ag^+ ions causing bacterial enzyme inhibition"
    ],
    "materials": [
        "Silver (Ag) metal",
        "Water (H_2O)",
        "Synthetic fiber polymers (e.g., polyester, nylon)"
    ],
    "energy_sources": [
        "High-voltage DC electricity"
    ],
    "inputs": [
        "Water",
        "Silver electrodes",
        "DC high-voltage power supply",
        "Synthetic fibers",
        "Aqueous nanosilver solution"
    ],
    "outputs": [
        "Colloidal nanosilver particles (1-5 nm)",
        "Antibacterial fiber material"
    ],
    "claimed_performance": "Nanosilver particle size <=5 nm; antibacterial efficiency 99.9 % within 5 minutes; coating load 0.01-0.1 g nanosilver per 100 g fiber; post-finishing at 160-200  deg C.",
    "experimental_evidence": "The patent cites experimental data showing 99.9 % antibacterial and germicidal efficiency of silver powders against a broad range of bacteria, and that particles <=5 nm provide superior surface adsorption and antibacterial activity.",
    "replication_status": null,
    "keywords": [
        "nanosilver",
        "antibacterial fiber",
        "high-voltage electrolysis",
        "nanoparticle synthesis",
        "silver coating",
        "textile antimicrobial"
    ],
    "related_technologies": [
        "Electrochemical nanoparticle synthesis",
        "Silver-based antimicrobial textiles",
        "Plasma synthesis of metal nanoparticles"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.7,
    "fringe_score": 0.1,
    "evidence_strength": 0.5,
    "risk_score": 0.2,
    "trl_estimate": 5,
    "source_urls": [
        "http://worldwide.espacenet.com/advancedSearch?locale=en_EP"
    ],
    "organizations": [
        "European Patent Office"
    ],
    "applications": [
        "Antibacterial clothing",
        "Medical textiles",
        "Deodorizing fabrics",
        "Hospital linens"
    ],
    "limitations": [
        "Requires very high voltage equipment and precise current control",
        "Safety concerns associated with 10 k-300 k V operation",
        "Potential environmental impact of released nanosilver"
    ],
    "open_questions": [
        "Long-term durability of the nanosilver coating after repeated laundering",
        "Scalability and cost of high-voltage electrolysis for industrial production",
        "Environmental fate and toxicity of nanosilver released from textiles"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "Nanosilver having a size of 5 nm or less can be produced on a mass scale by applying an electric field of 10,000 to 300,000 volts (DC) across two Ag electrode plates equipped in a water electrolysis system and allowing only a microcurrent to flow between the electrode plates.",
        "According to experimental data, silver powders show 99.9 % antibacterial and germicidal efficiency over a variety of bacteria... That means that almost no bacteria can survive 5 minutes or longer in contact with nanosilver.",
        "The electric current control is conducted until the nanosilver size becomes 5 nm or less and preferably 1 to 5 nm.",
        "The aqueous solution containing the nanosilver is preferably in an amount of 10 to 100 ppm of the nanosilver.",
        "An antibacterial fiber manufactured thereby, in which antibacterial fiber has the nanosilver adsorbed thereon in an amount of 0.01 to 0.1 g per 100 g of synthetic fibers."
    ]
}