Synthesis of ultra-small BaLuF5:Yb3+,Er3+@BaLuF5:Yb3+ active-core–active-shell nanoparticles with enhanced up-conversion and down-conversion luminescence by a layer-by-layer strategy

2015 ◽  
Vol 3 (9) ◽  
pp. 2045-2053 ◽  
Author(s):  
Yongling Zhang ◽  
Xiaohui Liu ◽  
Yanbo Lang ◽  
Zhen Yuan ◽  
Dan Zhao ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Layer By Layer ◽  
Shell Nanoparticles ◽  
Active Core ◽  
Luminescent Nanoparticles ◽  
Down Conversion

Ultra-small luminescent nanoparticles (NPs) are quite desirable for optoelectronic and biomedical applications.

scholarly journals Synthesis of Small Ce3+-Er3+-Yb3+ Tri-Doped BaLuF5 Active-Core-Active-Shell-Active-Shell Nanoparticles with Strong Down Conversion Luminescence at 1.5 μm

Nanomaterials ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 615 ◽  
Author(s):  
Yongling Zhang ◽  
Yudi Shi ◽  
Zhengkun Qin ◽  
Mingxing Song ◽  
Weiping Qin
Keyword(s):  
Communication Systems ◽  
Optical Fiber Communication ◽  
Pump Light ◽  
Layer By Layer ◽  
Shell Nanoparticles ◽  
Fiber Communication ◽  
Active Core ◽  
Surface Quenching ◽  
High Boiling Solvent ◽  
Down Conversion

Small fluoride nanoparticles (NPs) with strong down-conversion (DC) luminescence at 1.5 μm are quite desirable for optical fiber communication systems. Nevertheless, a problem exists regarding how to synthesize small fluoride NPs with strong DC emission at 1.5 μm. Herein, we propose an approach to improve 1.5 μm emission of BaLuF5:Yb3+,Er3+ NPs by way of combining doping Ce3+ ions and coating multiple BaLuF5: Yb3+ active-shells. We prepared the BaLuF5:18%Yb3+,2%Er3+,2%Ce3+ NPs through a high-boiling solvent method. The effect of Ce3+ concentration on the DC luminescence was systematically investigated in the BaLuF5:Yb3+,Er3+ NPs. Under a 980 nm laser excitation, the intensities of 1.53 μm emission of BaLuF5:18%Yb3+,2%Er3+,2%Ce3+ NPs was enhanced by 2.6 times comparing to that of BaLuF5:18%Yb3+,2%Er3+ NPs since the energy transfer between Er3+ and Ce3+ ions: Er3+:4I11/2 (Er3+) + 2F5/2 (Ce3+) → 4I13/2 (Er3+) + 2F7/2 (Ce3+). Then, we synthesized BaLuF5:18%Yb3+,2%Er3+,2%Ce3+@BaLuF5:5%Yb3+@BaLuF5:5%Yb3+ core-active-shell-active-shell NPs via a layer-by-layer strategy. After coating two BaLuF5:Yb3+ active-shell around BaLuF5:Yb3+,Er3+,Ce3+ NPs, the intensities of the 1.53 μm emission was enhanced by 44 times compared to that of BaLuF5:Yb3+,Er3+ core NPs, since the active-shells could be used to not only suppress surface quenching but also to transfer the pump light to the core region efficiently through Yb3+ ions inside the active-shells.

scholarly journals Layer-by-Layer Self-Assembly Composite Coatings for Improved Corrosion and Wear Resistance of Mg Alloy for Biomedical Applications

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 515
Author(s):  
Tongfang Liu ◽  
Song Rui ◽  
Sheng Li
Keyword(s):  
Wear Resistance ◽  
Self Assembly ◽  
Biomedical Applications ◽  
Composite Coatings ◽  
Covalent Bond ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Layer By Layer ◽  
Corrosion Propagation ◽  
Chemical Linkage

Mg alloys are promising biomedical metal due to their natural degradability, good processability, and favorable mechanical properties. However, the poor corrosion resistance limits their further clinical applications. In this study, the combined strategies of surface chemical treatment and layer-by-layer self-assembly were used to prepare composite coatings on Mg alloys to improve the biocorrosion resistance. Specially, alkalized AZ91 Mg alloy generated chemical linkage with silane via Si–O–Mg covalent bond at the interface. Subsequently, Si–OH group from silane formed a crosslinked silane layer by Si–O–Si network. Further chemical assembly with graphene oxide (GO), lengthened the diffusion pathway of corrosive medium. The chemically assembled composite coatings could firmly bond to Mg alloy substrate, which persistently and effectively acted as compact barriers against corrosion propagation. Improved biocorrosion resistance of AZ91 Mg alloy with self-assembly composite coatings of silane/GO was subsequently confirmed by immersion tests. Besides, the Mg alloy exhibited good wear resistance due to outside layer of GO with a lubricant effect. Cell viability of higher than 75% had also been found for the alloy with self-assembly composite coatings, which showed good cytocompatibility.

Tailoring layer-by-layer capsules for biomedical applications

Nanomedicine ◽  
2012 ◽  
Vol 7 (5) ◽  
pp. 771-788 ◽  
Author(s):  
Marie-Luce De Temmerman ◽  
Jo Demeester ◽  
Stefaan C De Smedt ◽  
Joanna Rejman
Keyword(s):  
Biomedical Applications ◽  
Layer By Layer

Engineered Layer-by-Layer Assembled Capsules for Biomedical Applications

2012 ◽  
pp. 801-829 ◽  
Author(s):  
Angus P. R. Johnston ◽  
Georgina K. Such ◽  
Sarah J. Dodds ◽  
Frank Caruso
Keyword(s):  
Biomedical Applications ◽  
Layer By Layer

scholarly journals Alginate Nanoformulation: Influence of Process and Selected Variables

2020 ◽  
Vol 13 (11) ◽  
pp. 335
Author(s):  
Hazem Choukaife ◽  
Abd Almonem Doolaanea ◽  
Mulham Alfatama
Keyword(s):  
Drug Delivery ◽  
Biomedical Applications ◽  
Effective Properties ◽  
Matrix Material ◽  
Cost Effective ◽  
Biological Properties ◽  
Layer By Layer ◽  
Therapeutic Outcomes ◽  
Manufacturing Techniques ◽  
Formulation Parameters

Nanocarriers are defined as structures and devices that are constructed using nanomaterials which add functionality to the encapsulants. Being small in size and having a customized surface, improved solubility and multi-functionality, it is envisaged that nanoparticles will continue to create new biomedical applications owing to their stability, solubility, and bioavailability, as well as controlled release of drugs. The type and physiochemical as well as morphological attributes of nanoparticles influence their interaction with living cells and determine the route of administration, clearance, as well as related toxic effects. Over the past decades, biodegradable polymers such as polysaccharides have drowned a great deal of attention in pharmaceutical industry with respect to designing of drug delivery systems. On this note, biodegradable polymeric nanocarrier is deemed to control the release of the drug, stabilize labile molecules from degradation and site-specific drug targeting, with the main aim of reducing the dosing frequency and prolonging the therapeutic outcomes. Thus, it is essential to select the appropriate biopolymer material, e.g., sodium alginate to formulate nanoparticles for controlled drug delivery. Alginate has attracted considerable interest in pharmaceutical and biomedical applications as a matrix material of nanocarriers due to its inherent biological properties, including good biocompatibility and biodegradability. Various techniques have been adopted to synthesize alginate nanoparticles in order to introduce more rational, coherent, efficient and cost-effective properties. This review highlights the most used and recent manufacturing techniques of alginate-based nanoparticulate delivery system, including emulsification/gelation complexation, layer-by-layer, spray drying, electrospray and electrospinning methods. Besides, the effects of the main processing and formulation parameters on alginate nanoparticles are also summarized.

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