成人做爰免费视频免费看_成人a级高清视频在线观看,成人a大片在线观看,成人a大片高清在线观看,成人av在线播放,一a一级片,一级黄 中国色 片,一级黄 色蝶 片,一级黄色 片生活片

 

文獻名：Rhodamine-based fluorescent polyacrylic nanoparticles: A highly selective and sensitive chemosensor for Fe (II) and Fe (III) cations in water

 

 

作者： Sara Ghezelsefloo^a, Jaber Keyvan Rad^b, Mahtab Hajiali^a, Ali Reza Mahdavian^b

^a Department of Chemistry, Science and Research Branch, Islamic Azad University, P.O. Box 14515/775, Tehran, Iran

^b Polymer Science Department, Iran Polymer & Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran

 

 

摘要：Fe²⁺ and specially Fe³⁺ are important in our daily life and their deficiency or excess amounts may cause serious disorders and infectious diseases. Most of their existing fluorescent sensors consist of small molecules and may operate in organic media with prolonged response time and inadequate detection limit which restrict their wide-spread applications. Fluorescent poly(methyl methacrylate-co-glycidyl methacrylate) nanoparticles bearing Rhodamine B ethylenediamine acrylate (RhAcL-3) were prepared through semi-continues emulsion polymerization. Chemical structure of the prepared RhAcL-3 polyacrylic nanoparticles with smooth spherical morphology, average particle size of 46 nm and narrow size distribution (polydispersity index of 0.09) were completely characterized by FTIR, ¹HNMR, UV-Vis, SEM and DLS techniques. Water dispersion of RhAcL-3 nanoparticles demonstrated an immediate and apparent color change together with enhancement in fluorescence emission at 590 nm after addition of Fe²⁺ and Fe³⁺ ions up to 2 and 2.2-folds, respectively. This was attributed to chelation of these ions to spirolactam moiety in Rhodamine B to consequate open-ring amide form. It was found that the presence of some other metal cations had no interference on the above affinity and sensing role. Linear dynamic detection range (4–320 µM) and detection limit of RhAcL-3 sensor toward Fe²⁺ and Fe³⁺ were estimated 2.63 and 2.5 µM, respectively. The results suggest that these prepared nanoparticles could be utilized as colorimetric and fluorescent sensor with instant responsivity, wide linear detection range, high sensitivity and low detection limit for Fe²⁺ and Fe³⁺ ions in future advances and applications.

 

關鍵詞：Sensor;Colorimetric;Fluorescence;Rhodamine B;Polyacrylic nanoparticles