scholarly journals Synthesis and luminescent properties of uniform monodisperse LuPO 4 :Eu 3+ /Tb 3+ hollow microspheres

2017 ◽  
Vol 4 (12) ◽  
pp. 171451 ◽  
Author(s):  
Yu Gao ◽  
He Yu ◽  
Cheng Shi ◽  
Guiyan Zhao ◽  
Yanfeng Bi ◽  
...  
Keyword(s):  
Large Scale ◽  
Exchange Process ◽  
Scale Up ◽  
Luminescent Properties ◽  
Inorganic Materials ◽  
Hollow Microspheres ◽  
Scale Production ◽  
Simple Method ◽  
Synthetic Process ◽  
Ion Exchange Process

Uniform monodisperse LuPO 4 :Eu 3+ /Tb 3+ hollow microspheres with diameters of about 2.4 µm have been successfully synthesized by the combination of a facile homogeneous precipitation approach, an ion-exchange process and a calcination process. The possible formation mechanism for the hollow microspheres was presented. Furthermore, the luminescence properties revealed that the LuPO 4 :Eu 3+ and LuPO 4 :Tb 3+ phosphors show strong orange-red and green emissions under ultraviolet excitation, respectively, which endows this material with potential application in many fields, such as light display systems and optoelectronic devices. Since the synthetic process can be carried out at mild conditions, it should be straightforward to scale up the entire process for large-scale production of the LuPO 4 hollow microspheres. Furthermore, this general and simple method may be of much significance in the synthesis of many other inorganic materials.

scholarly journals Large-scale fabrication of porous YBO 3 hollow microspheres with tunable photoluminescence

2018 ◽  
Vol 5 (4) ◽  
pp. 172186 ◽  
Author(s):  
Zhenhe Xu ◽  
He Yu ◽  
Feixue Ai ◽  
Guiyan Zhao ◽  
Yanfeng Bi ◽  
...  
Keyword(s):  
High Performance ◽  
Large Scale ◽  
Low Cost ◽  
Exchange Process ◽  
Hollow Spheres ◽  
Average Diameter ◽  
Hollow Microspheres ◽  
Precipitation Method ◽  
Polystyrene Spheres ◽  
Ion Exchange Process

Hollow lanthanide-doped compounds are some of the most popular materials for high-performance luminescent devices. However, it is challenging to find an approach that can fabricate large-scale and well-crystallized lanthanide-doped hollow structures and that is facile, efficient and of low cost. In this study, YBO 3 : Eu 3+ /Tb 3+ hollow microspheres were fabricated by using a novel multi-step transformation synthetic route for the first time with polystyrene spheres as the template, followed by the combination of a facile homogeneous precipitation method, an ion-exchange process and a calcination process. The results show that the as-obtained YBO 3 : Eu 3+ /Tb 3+ hollow spheres have a uniform morphology with an average diameter of 1.65 µm and shell thickness of about 160 nm. When used as luminescent materials, the emission colours of YBO 3 : Eu 3+ /Tb 3+ samples can be tuned from red, through orange, yellow and green-yellow, to green by simply adjusting the relative doping concentrations of the activator ions under the excitation of ultraviolet light, which might have potential applications in fields such as light display systems and optoelectronic devices.

scholarly journals Carbon microspheres decorated with iron sulfide nanoparticles for mercury(II) removal from water

2019 ◽  
Vol 55 (4) ◽  
pp. 1425-1435 ◽  
Author(s):  
Tibor Pasinszki ◽  
Melinda Krebsz ◽  
Deepak Chand ◽  
László Kótai ◽  
Zoltán Homonnay ◽  
...  
Keyword(s):  
Large Scale ◽  
Iron Sulfide ◽  
Scale Up ◽  
Mercury Ion ◽  
Scale Production ◽  
Order Kinetic ◽  
Carbon Microspheres ◽  
Simple Method ◽  
Ion Removal ◽  
Bet Analysis

Abstract A new and simple method is developed to synthesize carbon microspheres decorated with iron sulfide nanoparticles for mercury ion removal from water. The synthesis is based on carbonizing polystyrene–divinylbenzene-based and iron(III) sulfate-loaded cation exchange resins between 500 and 1000 °C. The phase composition, surface area, and morphology of these materials are characterized by various spectroscopic and diffraction techniques, including Mössbauer spectroscopy, powder X-ray diffraction, Raman and scanning electron microscopy, and BET analysis. Pyrrhotite is found to be the dominant iron-containing phase. The adsorption performance of microspheres for mercury ion removal from water is studied as a function of adsorbent load and contact time at pH 6.5 using a solution of 40 mg dm−3 mercury ion. Pyrrhotite nanoparticles played a key role in mercury ion removal amounting to 70–90% of the extracted amount. A high adsorption capacity of 104 mg of mercury/g of adsorbent at an adsorbent load of 0.33 g dm−3 is achieved, and the removal kinetics could be well fitted with a pseudo-second-order kinetic model, indicating chemical sorption. The synthetic method is easy to scale up for large-scale production and materials are easy to handle, which is significant for large-scale environmental applications.

scholarly journals Large-scale synthesis and luminescence of GdPO4 hollow microspheres

RSC Advances ◽  
2018 ◽  
Vol 8 (39) ◽  
pp. 21857-21862 ◽  
Author(s):  
Yu Gao ◽  
Yongkun Qiu ◽  
Xin Wang ◽  
Yanfeng Bi ◽  
Guiyan Zhao ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Large Scale ◽  
Exchange Process ◽  
Hollow Microspheres ◽  
Precipitation Method ◽  
Homogeneous Precipitation ◽  
Calcination Process ◽  
Ion Exchange Process ◽  
Homogeneous Precipitation Method ◽  
First Time

GdPO4 hollow microspheres were synthesized by using a novel multi-step route for the first time with polystyrene (PS) spheres as the template, followed by the combination of a facile homogeneous precipitation method, an ion-exchange process, and a calcination process.

Solid Lipid Nanoparticles: A Promising Drug Delivery Technology

2009 ◽  
Vol 2 (2) ◽  
pp. 509-516
Author(s):  
S. Pragati ◽  
S. Kuldeep ◽  
S. Ashok ◽  
M. Satheesh
Keyword(s):  
Drug Delivery ◽  
Solid Lipid Nanoparticles ◽  
Large Scale ◽  
Colloidal Particles ◽  
Scale Up ◽  
Lipid Nanoparticles ◽  
Scale Production ◽  
Research Activity ◽  
New Approach ◽  
Solid Lipid

One of the situations in the treatment of disease is the delivery of efficacious medication of appropriate concentration to the site of action in a controlled and continual manner. Nanoparticle represents an important particulate carrier system, developed accordingly. Nanoparticles are solid colloidal particles ranging in size from 1 to 1000 nm and composed of macromolecular material. Nanoparticles could be polymeric or lipidic (SLNs). Industry estimates suggest that approximately 40% of lipophilic drug candidates fail due to solubility and formulation stability issues, prompting significant research activity in advanced lipophile delivery technologies. Solid lipid nanoparticle technology represents a promising new approach to lipophile drug delivery. Solid lipid nanoparticles (SLNs) are important advancement in this area. The bioacceptable and biodegradable nature of SLNs makes them less toxic as compared to polymeric nanoparticles. Supplemented with small size which prolongs the circulation time in blood, feasible scale up for large scale production and absence of burst effect makes them interesting candidates for study. In this present review this new approach is discussed in terms of their preparation, advantages, characterization and special features.

Recombinant Protein Production in Microalgae: Emerging Trends

2020 ◽  
Vol 27 (2) ◽  
pp. 105-110 ◽  
Author(s):  
Niaz Ahmad ◽  
Muhammad Aamer Mehmood ◽  
Sana Malik
Keyword(s):  
Chloroplast Genome ◽  
Recombinant Proteins ◽  
Large Scale ◽  
Higher Plants ◽  
Scale Up ◽  
Chloroplast Transformation ◽  
Point Of View ◽  
Nuclear Transformation ◽  
Scale Production ◽  
Algal Chloroplast

: In recent years, microalgae have emerged as an alternative platform for large-scale production of recombinant proteins for different commercial applications. As a production platform, it has several advantages, including rapid growth, easily scale up and ability to grow with or without the external carbon source. Genetic transformation of several species has been established. Of these, Chlamydomonas reinhardtii has become significantly attractive for its potential to express foreign proteins inexpensively. All its three genomes – nuclear, mitochondrial and chloroplastic – have been sequenced. As a result, a wealth of information about its genetic machinery, protein expression mechanism (transcription, translation and post-translational modifications) is available. Over the years, various molecular tools have been developed for the manipulation of all these genomes. Various studies show that the transformation of the chloroplast genome has several advantages over nuclear transformation from the biopharming point of view. According to a recent survey, over 100 recombinant proteins have been expressed in algal chloroplasts. However, the expression levels achieved in the algal chloroplast genome are generally lower compared to the chloroplasts of higher plants. Work is therefore needed to make the algal chloroplast transformation commercially competitive. In this review, we discuss some examples from the algal research, which could play their role in making algal chloroplast commercially successful.

Synthesis and up-conversion photoluminescence properties of uniform monodisperse YbPO4:Ln3+ (Ln3+ = Er3+, Tm3+, Ho3+) hollow microspheres

2017 ◽  
Vol 41 (17) ◽  
pp. 8959-8964 ◽  
Author(s):  
Zhenhe Xu ◽  
Yanfeng Bi ◽  
He Yu ◽  
Junying Lin ◽  
Fu Ding ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Exchange Process ◽  
Hollow Microspheres ◽  
Homogeneous Precipitation ◽  
Photoluminescence Properties ◽  
Calcination Process ◽  
Ion Exchange Process ◽  
First Time

Uniform monodisperse YbPO4 hollow microspheres have been successfully synthesized via the combination of a facile homogeneous precipitation approach, an ion-exchange process, and a calcination process for the first time.

Synthesis and Thermal Stability of HfO2 Nanoparticles

2010 ◽  
Vol 1256 ◽  
Author(s):  
Girija Shankar Chaubey ◽  
Yuan Yao ◽  
Julien Pierre Amelie Makongo Mangan ◽  
Pranati Sahoo ◽  
Pierre F. P. Poudeu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Large Scale ◽  
Average Diameter ◽  
Scale Production ◽  
Simple Method ◽  
Good Thermal Stability ◽  
Large Scale Production

AbstractA simple method is reported for the synthesis of monodispersed HfO2 nanoparticles by the ammonia catalyzed hydrolysis and condensation of hafnium (IV) tert-butoxide in the presence of surfactants at room temperature. Transmission electron microscopy shows faceted nanoparticles with an average diameter of 3-4 nm. As-synthesized nanoparticles are amorphous in nature and crystallize upon moderate heat treatment. The HfO2 nanoparticles have a narrow size distribution, large specific surface area and good thermal stability. Specific surface area was about 239 m2/g on as-prepared nanoparticle samples while those annealed at 500 °C have specific surface area of 221 m2/g indicating that there was no significant increase in particle size. This result was further confirmed by TEM images of nanoparticles annealed at 300 °C and 500 °C. X-ray diffraction studies of the crystallized nanoparticles revealed that HfO2 nanoparticles were monoclinic in structure. The synthetic procedure used in this work can be readily modified for large scale production of monodispersed HfO2 nanoparticles.

scholarly journals Scale-up of the production of highly reactive biogenic magnetite nanoparticles using Geobacter sulfurreducens

2015 ◽  
Vol 12 (107) ◽  
pp. 20150240 ◽  
Author(s):  
J. M. Byrne ◽  
H. Muhamadali ◽  
V. S. Coker ◽  
J. Cooper ◽  
J. R. Lloyd
Keyword(s):  
Magnetic Properties ◽  
Large Scale ◽  
Scale Up ◽  
Surface Reactivity ◽  
Geobacter Sulfurreducens ◽  
Scale Production ◽  
Buffer Solution ◽  
Pilot Plant Scale ◽  
Functional Biomaterials ◽  
Microbial Systems

Although there are numerous examples of large-scale commercial microbial synthesis routes for organic bioproducts, few studies have addressed the obvious potential for microbial systems to produce inorganic functional biomaterials at scale. Here we address this by focusing on the production of nanoscale biomagnetite particles by the Fe(III)-reducing bacterium Geobacter sulfurreducens , which was scaled up successfully from laboratory- to pilot plant-scale production, while maintaining the surface reactivity and magnetic properties which make this material well suited to commercial exploitation. At the largest scale tested, the bacterium was grown in a 50 l bioreactor, harvested and then inoculated into a buffer solution containing Fe(III)-oxyhydroxide and an electron donor and mediator, which promoted the formation of magnetite in under 24 h. This procedure was capable of producing up to 120 g of biomagnetite. The particle size distribution was maintained between 10 and 15 nm during scale-up of this second step from 10 ml to 10 l, with conserved magnetic properties and surface reactivity; the latter demonstrated by the reduction of Cr(VI). The process presented provides an environmentally benign route to magnetite production and serves as an alternative to harsher synthetic techniques, with the clear potential to be used to produce kilogram to tonne quantities.

Characterization of Thin Film CdTe photovoltaic materials deposited by high plasma density magnetron sputtering

2011 ◽  
Vol 1323 ◽  
Author(s):  
A. Abbas ◽  
J.W. Bowers ◽  
B. Maniscalco ◽  
S. Moh ◽  
G.D West ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Plasma Density ◽  
Large Scale ◽  
Scale Up ◽  
High Plasma ◽  
Window Layer ◽  
Closed Field ◽  
Scale Production ◽  
Batch System ◽  
High Plasma Density

ABSTRACTA new magnetron sputtering strategy is introduced that utilizes high plasma density (~5mA.cm-2) to avoid or reduce high temperature processing. The technique uses magnetrons of opposing magnetic polarity to create a “closed field” in which the plasma density is enhanced without the need for high applied Voltages. A batch system has been used which employs a rotating vertical drum as the substrate carrier and a symmetrical array of linear magnetrons. The magnetrons are fitted with target materials for each of the thin films required in the photovoltaic (PV) stack including the CdTe absorber layer, CdS window layer, metal contact using the conventional superstrate configuration. The “closed field” sputtering technology allows scale up not only for larger batch system designs but it is also configurable for “in-line” or “roll to roll” formats for large scale production. The morphology of each of the layers is characterized using a variety of structural and optical techniques including Field Emission Gun SEM and X-ray diffraction (XRD).

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