Abumelha Hana M, Hameed Ahmed, Alkhamis Kholood M, Alkabli Jafar, Aljuhani Enas, Shah Reem, El-Metwaly Nashwa M
Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, 11671 Riyadh, Saudi Arabia.
Department of Chemistry, Faculty of Applied Science, Umm-Al-Qura University, 00966 Makkah, Saudi Arabia.
ACS Omega. 2021 Oct 7;6(41):27315-27324. doi: 10.1021/acsomega.1c04127. eCollection 2021 Oct 19.
Photochromic materials have attracted broad interest to enhance the anti-counterfeiting of commercial products. In order to develop anti-counterfeiting mechanically reliable composite materials, it is urgent to improve the engineering process of both the material and matrix. Herein, we report on the development of anti-counterfeiting mechanically reliable nanocomposites composed of rare-earth doped aluminate strontium oxide phosphor (RESA) nanoparticles (NPs) immobilized into the thermoplastic polyurethane-based nanofibrous film successfully fabricated via the simple solution blowing spinning technology. The generated photochromic film exhibits an ultraviolet-stimulated anti-counterfeiting property. Different films of different emissive properties were generated using different total contents of RESA. Transmission electron microscopy was utilized to investigate the morphological properties of RESA NPs to display a particle diameter of 3-17 nm. The morphologies, compositions, optical transmittance, and mechanical performance of the produced photochromic nanofibrous films were investigated. Several analytical methods were employed, including energy-dispersive X-ray spectroscopy, scanning electron microscopy, and Fourier-transform infrared spectrometry. The fibrous diameter of RESA-TPU was in the range of 200-250 nm. In order to ensure the development of transparent RESA-TPU film, RESA must be prepared in the nanosized form to allow better dispersion without agglomeration in the TPU matrix. The luminescent RESA-TPU film displayed an absorbance intensity at 367 nm and two emission intensities at 431 and 517 nm. The generated RESA-TPU films showed an enhanced hydrophobicity without negatively influencing their original appearance and mechanical properties. Upon irradiation with ultraviolet light, the transparent nanofibrous films displayed rapid and reversible photochromism to greenish-yellow without fatigue. The produced anti-counterfeiting films demonstrated stretchable, flexible, and translucent properties. As a simple sort of anti-counterfeiting substrates, the current novel photochromic film provides excellent anti-counterfeiting strength at low-cost as an efficient method to develop versatile materials with high mechanical strength to create an excellent market as well as adding economic and social values.
光致变色材料在增强商业产品防伪方面引起了广泛关注。为了开发机械性能可靠的防伪复合材料，迫切需要改进材料和基体的工程工艺。在此，我们报道了一种机械性能可靠的防伪纳米复合材料的开发，该复合材料由稀土掺杂铝酸锶氧化物荧光粉（RESA）纳米颗粒（NPs）固定在热塑性聚氨酯基纳米纤维膜中组成，通过简单的溶液吹纺技术成功制备。所制备的光致变色膜具有紫外线激发的防伪性能。使用不同总含量的RESA制备了具有不同发光特性的不同薄膜。利用透射电子显微镜研究了RESA NPs的形态特性，显示其粒径为3-17nm。对所制备的光致变色纳米纤维膜的形态、组成、光学透过率和机械性能进行了研究。采用了几种分析方法，包括能量色散X射线光谱法、扫描电子显微镜和傅里叶变换红外光谱法。RESA-TPU的纤维直径在200-250nm范围内。为了确保透明RESA-TPU膜的开发，RESA必须制备成纳米尺寸形式，以便在TPU基体中更好地分散而不发生团聚。发光的RESA-TPU膜在367nm处显示出吸收强度，在431和517nm处显示出两个发射强度。所制备的RESA-TPU膜显示出增强的疏水性，而不会对其原始外观和机械性能产生负面影响。在用紫外线照射时，透明纳米纤维膜显示出快速且可逆的光致变色，变为绿黄色且无疲劳现象。所制备的防伪膜具有可拉伸、柔韧性和半透明的特性。作为一种简单的防伪基材，当前这种新型光致变色膜以低成本提供了优异的防伪强度，是开发具有高机械强度的多功能材料的有效方法，以创造一个良好的市场，并增加经济和社会价值。
