Nano-Gold Colloidal Color Gilding
纳米金胶体染色鎏饰
标签：纳米金, 胶体金, 等离子共振, 表面染色, 精密装饰
用 5–20 nm 金胶体（柠檬酸盐还原法制备，粒径变异系数 <15%）浸染多孔着色面（阳极氧化或化学转化膜），借纳米金表面等离子共振获得紫红至酒红表面色。工艺：活化面→浸入胶体液（pH 5–6）10–30 min→纯水漂洗→60℃ 烘干→疏水封护。颜色随粒径变化：8 nm 偏红、40 nm 偏紫。适合小件精密装饰，非传统鎏金的替代。
Immerse porous converted surfaces (anodized or chemically converted) in 5–20 nm gold colloid (citrate reduction, size CV <15%) for purple-red to wine-red tones via localized surface plasmon resonance. Process: activate → dip in colloid (pH 5–6) 10–30 min → rinse → dry at 60℃ → hydrophobic seal. Hue tracks particle size: 8 nm reddish, 40 nm violet. For fine smallwork, not a substitute for fire gilding. ---