http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Tao Wang,Aili Yan,Longgang Zhong,Sheng Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.10
The main issue limiting the widespread application of superhydrophobic coatings is their low surface robustness, which is closely related to surface roughness on the micro- or nanoscale, and is mechanically weak and easily gets abraded. This work uses Te nanowires as templates to support a carbon layer substrate for the growth of titanium dioxide nanoparticles; this forms hierarchical structures (Te@C-TiO2 nanocomposites). Modification with 1H, 1H, 2H, 2H - perfluoroalkyltriethoxysilane created a free-standing superhydrophobic coating. The optimal preparation conditions for the coating were identified after a systematic investigation of the reaction time of the carbon precursor and concentration of TiOSO4. The best anti-wetting performance was attained with 200 nm diameter Te@C and 15mL concentration of TiOSO4. Furthermore, due to their free-standing performance, the nanocomposites were easily loaded onto a polyester fabric to generate a robust superhydrophobic fabric. This fabric shows excellent mechanical durability and strong resistance to knife scratching, sandpaper abrasion, washing, as well as exposure to acid and alkali solutions. Moreover, the robust fabric is able to separate oil/water mixtures with high separation efficiency.
Xiaoyu Zhang,Liyuan Fan,Yanshuai Cui,Tianming Cui,Shengfu Chen,Guanglong Ma,Wenlong Hou,Longgang Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2020 NANO Vol.15 No.02
The green synthesis of gold nanoparticles (Au NPs) for catalytic and biological applications has been drawing great attention. To compare with plant extracts, the polysaccharides may be good reducing and stabilizing agents. In this work, we describe the preparation of longan polysaccharide stabilized gold nanoparticles (Aun-LP NPs) by reduction of gold ions using a green synthetic method. The formation of gold nanoparticles (Au NPs) was confirmed by UV-Vis spectra. TEM showed that Au NPs had a small size (7.8–15.6 nm) and were highly dispersed without any aggregation. XPS confirmed that the surface elemental composition of Aun-LP NPs was C, O, and Au. DLS demonstrated that Aun-LP NPs had good stability and negative zeta potential. In addition, Aun-LP NPs had high catalytic activity for the reduction of 4-nitrophenol. More importantly, Aun-LP NPs had ignorable cytotoxicity towards HeLa cells and showed good antioxidant activity. Taken together, the results indicated that longan polysaccharide can be used as reducing agents and stabilizers for the preparation of metallic nanoparticles, and the product had wide applications.