| 1. |
- Gu, Xiuquan, et al.
(författare)
-
ZnO based heterojunctions and their application in environmental photocatalysis
- 2016
-
Ingår i: Nanotechnology. - : IOP Publishing. - 0957-4484 .- 1361-6528. ; 27:40
-
Forskningsöversikt (refereegranskat)abstract
- As an alternative to TiO2 photocatalysts, ZnO exhibits a large potential for photocatalytic (PC) applications in environmental treatments, such as degradation of wastewater, sterilization of drinking water, and air cleaning. However, the efficiency achieved with ZnO to date is far from that expected for commercialization, due to rapid charge recombination, photo-corrosion as well as poor utilization of solar energy. Fortunately, in recent years, a great number of breakthroughs have been achieved in PC performance (including activity and stability) of micro-/ nano-structured ZnO by forming heterojunctions (HJs) with metal nanoparticles (NPs), carbon nanostructures and other semiconductors. In most cases, the improvement of PC performance was ascribed to the better charge separation at the interfaces between ZnO and the other components. Sometimes, the formation of hybrids is also in favor of visible light harvesting. This review summarizes recent advances in the fields of environmental photocatalysis by ZnO based HJs, and especially emphasizes their abilities in degradation of organic pollutants or harmful substances in water. We aim to reveal the mechanism underlying the enhanced PC performance by constructing HJs, and extend the potential of ZnO HJ photocatalysts for future trends, and practical, large-scale applications in environment-related fields.
|
|
| 2. |
- Li, Cuiyan, et al.
(författare)
-
Metal-enhanced fluorescence of OG-488 doped in Au@SiO2 core-shell nanoparticles
- 2013
-
Ingår i: Materials letters (General ed.). - : Elsevier BV. - 0167-577X .- 1873-4979. ; 112, s. 169-172
-
Tidskriftsartikel (refereegranskat)abstract
- Monodisperse Au-core silica-shell (Au@SiO2) nanoparticles demonstrated a great potential for the application of metal-enhanced fluorescence (MEF). The silica shell was doped with a novel fluorophore, Oregon Green 488-isothiocyanate (OG-488). The fluorescence of OG-488 was enhanced by Au nanoparticle core, while the silica shell was used to control the distance between OG-488 and Au surface to alleviate fluorescence quenching. The fluorescence enhancement by Au@SiO2 nanoparticles was investigated by varying SiO2 shell thickness (from 15 nm to 50 nm) and Au core diameter (40 nm, 60 nm and 80 nm). Compared with OG-488 doped silica spheres without Au core, the Au@SiO2 nanoparticles maximally gave 35-fold stronger fluorescence emission.
|
|
| 3. |
- Li, Cuiyan, et al.
(författare)
-
Microwave-solvothermal synthesis of Fe3O4 magnetic nanoparticles
- 2013
-
Ingår i: Materials letters (General ed.). - : Elsevier BV. - 0167-577X .- 1873-4979. ; 107, s. 23-26
-
Tidskriftsartikel (refereegranskat)abstract
- Fe3O4 magnetic nanoparticles were successfully synthesized by the microwave-solvothermal method in a simple reaction system during significantly shorter time than traditional solvothermal or hydrothermal methods. In this synthetic system, ethylene glycol acts as solvent, microwave mediate, and reductant; trisodium citrate works as assistant reductant and electrostatic stabilizer, which makes the Fe3O4 rianoparticles well dispersed in the solution; NH4Ac is the nucleating agent. In the process, a burst of "hot-spots" induced by quick microwave irradiation can create a condition for uniform seeding in the precursor solution, and accelerate the formation of Fe3O4 nanocrystals. F4(3)O(4) nanoparticles prepared by the microwave-solvothermal method showed a higher saturation magnetization than the sample synthesized by the conventional solvothermal method, which can be ascribed to the fact that the former has smaller particle sizes than the later.
|
|
| 4. |
- Li, Cuiyan, et al.
(författare)
-
Photocatalytic and antibacterial properties of Au-decorated Fe3O4@mTiO(2) core-shell microspheres
- 2014
-
Ingår i: Applied Catalysis B. - : Elsevier BV. - 0926-3373 .- 1873-3883. ; 156, s. 314-322
-
Tidskriftsartikel (refereegranskat)abstract
- A facile approach for the fabrication of Au-decorated mesoporous Fe3O4@TiO2 (Fe3O4@mTiO(2)) core-shell microspheres is demonstrated. The protocol involved the coating of a successive layer of TiO2 onto a magnetic Fe3O4 core via a sol-gel process, followed by TiO2 crystallization and mesopore-formation by a hydrothermal treatment, and then the deposition of Au nanoparticles onto Fe3O4@mTiO(2) microspheres through an in situ reduction of perchloric acid. The mesoporous microspheres (Fe3O4@mTiO(2)) showed stronger magnetic properties than the dense sample (Fe3O4@TiO2) before the hydrothermal treatment. The size and loading amount of Au nanoparticles were controlled by the reduction temperature and concentration of Au salt, respectively. Compared to unmodified Fe3O4@mTiO(2) microspheres, Fe3O4@mTiO(2)@Au microspheres showed higher photocatalytic activity for organic degradation and antibacterial action in water. These core-shell Fe3O4@mTiO(2)@Au microspheres can serve as efficient and recyclable photocatalysts, which have promising applications in environmental treatment.
|
|
| 5. |
- Li, Cuiyan, et al.
(författare)
-
Polyacrylamide-metal nanocomposites : one-pot synthesis, antibacterial properties, and thermal stability
- 2013
-
Ingår i: Journal of nanoparticle research. - : Springer Science and Business Media LLC. - 1388-0764 .- 1572-896X. ; 15:9, s. UNSP 1922-
-
Tidskriftsartikel (refereegranskat)abstract
- The incorporation of inorganic nanoparticles into polymers is a hot research spot, since it endows the nanocomposites with new or improved properties by exploiting synergistic effects. Here we report a facile one-pot synthesis of polyacrylamide (PAM)-metal (M = Au, Ag, or Pd) nanocomposites in ethylene glycol (EG). The simultaneous polymerization of the acylamide (AM) monomer and formation of metal nanoparticles lead to a homogeneous distribution of metal nanoparticles in the PAM matrix. The sizes of Au, Ag, and Pd nanoparticles are 55.50 +/- 10.6, 14.15 +/- 2.57, and 7.74 +/- 1.82 nm, respectively. The reaction system only includes EG, AM monomer, and corresponding metal salt. EG acts as both the solvent and the reducing reagent. Also, no initiator for AM polymerization and no surfactant for stabilization of metal nanoparticles are used. Furthermore, this simple synthetic route does not rely on any special or expensive equipment, thus can be exploited to the synthesis of similar polymer-inorganic nanocomposites. Compared to PAM, the PAM-metal nanocomposites showed enhanced thermal stability and antibacterial properties.
|
|
| 6. |
- Wang, Xi, et al.
(författare)
-
Gene expression signature in endemic osteoarthritis by microarray analysis
- 2015
-
Ingår i: International Journal of Molecular Sciences. - Basel, Switzerland : MDPI. - 1661-6596 .- 1422-0067. ; 16:5, s. 11465-11481
-
Tidskriftsartikel (refereegranskat)abstract
- Kashin-Beck Disease (KBD) is an endemic osteochondropathy with an unknown pathogenesis. Diagnosis of KBD is effective only in advanced cases, which eliminates the possibility of early treatment and leads to an inevitable exacerbation of symptoms. Therefore, we aim to identify an accurate blood-based gene signature for the detection of KBD. Previously published gene expression profile data on cartilage and peripheral blood mononuclear cells (PBMCs) from adults with KBD were compared to select potential target genes. Microarray analysis was conducted to evaluate the expression of the target genes in a cohort of 100 KBD patients and 100 healthy controls. A gene expression signature was identified using a training set, which was subsequently validated using an independent test set with a minimum redundancy maximum relevance (mRMR) algorithm and support vector machine (SVM) algorithm. Fifty unique genes were differentially expressed between KBD patients and healthy controls. A 20-gene signature was identified that distinguished between KBD patients and controls with 90% accuracy, 85% sensitivity, and 95% specificity. This study identified a 20-gene signature that accurately distinguishes between patients with KBD and controls using peripheral blood samples. These results promote the further development of blood-based genetic biomarkers for detection of KBD.
|
|
