Narrow Results

The PEG6000/nano-Ni(OH)₂ sol was prepared by modified sol–gel method. The effect of Ac^- on Ni(OH)₂ colloidal particles and the structure of PEG6000/nano-Ni(OH)₂ was investigated. The results show that hydrogen bonds or other weak interaction forces between PEG6000 and Ni(OH)₂ can change the zeta potential of the Ni(OH)₂ surface and enhance the colloidal stability of Ni(OH)₂. The stable region of the PEG6000/Ni(OH)₂ sol was determined by measuring the viscosity. The ratio of PEG6000 to Ni(OH)₂ is the principal factor that influences the flow patterns of the sol. Surfaces of the thin films prepared from Newtonian sol by sol–gel spin-coating method are smooth while those from pseudoplastic sol are rough. The results establish the theoretical foundation for preparing the nano-NiO thin films by spin-coating method.

Herein, a simple-green road for preparing carbon dots (CDs) from the mixture of PEG6000 and papain with approving fluorescence has been successfully developed for the first time. Meanwhile, the current CDs were characterized by analytical means such as fluorescence, UV visible spectrophotometer, HR-TEM, XPS and FTIR and so on. Afterwards, this kind of CDs were employed for analyzing doxycycline (DC) relying on the mechanism that the functional group of DC had interactions with CDs, hence, leading to the fluorescence quenching. Also, this DC analytical method mentioned here permitted in a linear range of $5.0\times 10^{-8}$mol/L-$5.0\times 10^{-4}$mol/L as well as a detection limit of 18nM at a signal-to-noise ratio (S/N) of 3. More importantly, the CDs prepared here were still explored for milk real samples, indicating their potential for broadening avenues towards other various applications.