Pansare Amol V, Khairkar Shyam R, Shedge Amol A, Chhatre Shraddha Y, Patil Vishwanath R, Nagarkar Amit A
Department of Chemistry, University of Mumbai, Santacruz (E), Mumbai, 400098, India.
National Chemical Laboratory (NCL), Dr. Homi Bhabha Road, Pune, 411008, India.
Adv Mater. 2018 Jul 4:e1801523. doi: 10.1002/adma.201801523.
In situ reduction of chloroauric acid inside an amine-cured epoxy matrix leads to formation of gold nanoparticles which are embedded inside the part. This phenomenon is leveraged to design an authentication system for composites wherein the particles are embedded spatially and are invisible to the naked eye. Under UV light, the particles diffract light and create an easily visible path. The particles penetrate inside the part and create a permanent, cost-effective, tamper-proof code. The advantage of this technique is that this authentication system can be built in composite parts after fabrication of the composite structure. As very small amount (nanograms) of particles are present in the part, negligible change in the thermal characteristics of the parent matrix is observed. The particles can be embedded easily in carbon fiber as well as glass fiber reinforced epoxy structures.
在胺固化环氧基质中原位还原氯金酸会导致形成嵌入部件内部的金纳米颗粒。利用这一现象设计了一种复合材料认证系统，其中颗粒在空间上嵌入且肉眼不可见。在紫外光下，颗粒使光发生衍射并形成易于看见的路径。颗粒渗透到部件内部并创建一个永久性、经济高效且防篡改的代码。该技术的优点是这种认证系统可以在复合结构制造后构建在复合部件中。由于部件中存在极少量（纳克级）的颗粒，观察到母体基质的热特性变化可忽略不计。这些颗粒可以轻松嵌入碳纤维以及玻璃纤维增强的环氧结构中。
