RENEWABLE ENERGY
·
2021
·
IF 8.001
Huanmei Yuan,Hao Bai,Hao Chen,Zefei Zhang,Haifei An,Weijian Tian
Phase change micro/nanocapsules with high thermal conductivity shells have extensive application prospects in solar energy storage systems and electronics cooling. To improve the heat transfer of the capsules, a method of preparing Ag-shell coated phase change micro/nanocapsules was developed, where the AgBr ultrafine solid particles are introduced to enhance the rigidity of emulsion droplets in the liquid-solid phase transition process, and by employing hydroquinone as the reductant to repeatedly reduce the AgBr that had been adhered to the surface of the emulsion droplets, an Ag shell is formed on the surface of the cores. In this work, palmitic acid (PA) is used as the core material, and the prepared PA/Ag nanocapsules (100–600 nm) exhibit high thermal storage capability and good thermal reliability. The bulk thermal conductivity of the nanocapsules can be as high as 4.072 W/(m·K), indicating that the Ag shell can effectively improve the thermal conductivity of the nanocapsules. Besides, the thermal response of the nanocapsules is estimated by simulating a single-particle heat transfer process considering nanoscale effects , and the results demonstrate that the thermal response time of PA/Ag nanocapsule (350 nm) in working fluid (water, 80 °C) could be as short as 150ns.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2015
·Vol. 17
·期 3
·1-10
·
IF 2.184
Zhang Ya-Fang,Wang Jia-Hong,Ma Liang,Nan Fan,Cheng Zi-Qiang,Zhou Li,Wang Qu-Quan
Silver-coated gold nanoshells with 1,4-BDT molecules as the spacer (Ag/BDT/Au) were synthesized on the surface of SiO 2 nanospheres. The surface plasmon resonance of Au/SiO 2 and Ag/BDT/Au/SiO 2 nanoparticles with single and double shells were tuned by adjusting the thickness of Au and Ag nanoshells. The enhanced local field in the gap of Au and Ag shells is demonstrated by measuring Raman scattering and nonlinear refraction. The results show that the Raman intensity is enhanced by 17 times and the nonlinear refractive index is enhanced by 30 % due to the growth of Ag shells.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2023
·
IF 4.3
Mengjie Lu,Xiaojuan Fu,Huihui Xie,Min Liu,Peng Wei,Weidong Zhang,Yahong Xie,Ying Qi
In this work, the sensitive colorimetric detection of Cu 2+ was realized based on the redox reaction of the outer silver shell of silver coated gold nanobipyramids (Au@Ag nanoparticles) and Cu 2+ . The decrease of the silver nanoshell thickness leads to the tremendous blue shift of the longitudinal localized surface plasmon resonance (LSPR) peak and accompanies a vivid color change from yellow to cyan which could be employed to quantitatively detect the concentrations of Cu 2+ . This nanoprobe displays a linear range of 0.5–100 μM with a limit of detection (LOD) of 0.16 μM and has the most obvious color change with the lowest LOD of 12 μM by naked eyes. In this case, the Au@Ag nanoparticles (Au@Ag NPs) are gradually etched from the nanorods to nanorices because the silver shell of Au@Ag NPs is etched by the Cu 2+ . In the process of anti-interference and actual water detection, it can be seen that the prepared detection sensor has specific selectivity for Cu 2+ , and has a certain application value in the detection of Cu 2+ content in food .
研究领域:
纳米技术
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2018
·Vol. 12
·期 2
·449-455
·
IF 7.994
Huang Zhulin,Meng Guowen,Hu Xiaoye,Pan Qijun,Huo Dexian,Zhou Hongjian,Ke Yan,Wu Nianqiang
A facile synthetic approach has been developed to prepare uniform and size-tunable spiky Au@Ag core-shell nanoparticles (NPs) to tailor the localized surface plasmon resonance (LSPR) properties. The gradual assembly of small Au nanocrystals allows the size of spiky Au NPs to be modulated from tens to several hundreds of nanometers by tuning the concentration of initial Au seeds and Au source; and the thickness of the Ag shell can be adjusted with stepwise reduction of Ag(I) ions. The LSPR bands of such spiky Au@Ag core-shell NPs resemble those of pure spiky Au NP cores of similar sizes in near-infrared region, and increasing the Ag shell thickness results in a blue shift and broadening of the LSPR band in the near-infrared region. Additionally, the spiky Au@Ag core-shell NPs exhibit improved surface-enhanced Raman scattering (SERS) activity as compared to the bare spiky Au NPs and spherical Ag@Au NPs. This work has offered a facile route to synthesize plasmonic metal NPs with LSPR band in 650 to 800 nm that show strong enhancement of localized electromagnetic field, which provides an effective SERS substrate for SERS imaging and detection in biological fluids and tissues.
研究领域:
纳米材料科学
·
生物医学检测
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2016
·Vol. 60
·期 1
·68-74
·
IF 0
Wang Di,Wang Ruihong,Liu Liyuan,Qu Yang,Wang Guofeng,Li Yadong
Techniques for detecting glucose are developing at a breathtaking speed because diabetes mellitus can cause many serious complications, such as blindness, high blood pressure heart disease and kidney failure. Herein, water soluble NaYF 4 :Eu 3+ @Ag core-shell nanocrystals for glucose detection with lower detection limit have been successfully developed, using NaYF 4 :Eu 3+ cores as the energy donors and Ag shells as the efficient quenchers through energy transfer. After immobilization of glucose oxidase (GOx) on the surface of NaYF 4 :Eu 3+ @Ag core-shell nanocrystals, the Ag shells can be decomposed in the presence of glucose, accompanied by down-shifting luminescence recovery. The limit of detection of NaYF 4 :Eu 3+ @Ag was 0.12 μmol L −1 . Therefore, the NaYF 4 :Eu 3+ @Ag can be easily extended to the detection of a variety of H 2 O 2 -involved analytes.
研究领域:
分析化学
·
纳米生物技术
·
生物传感
·
糖尿病检测
·
分子诊断
·
荧光探针
✓ 已验证
DOI
危险品化学品经营许可证（带存储）