Time-Resolved In Situ Synchrotron X-ray Study and Large-Scale Production of Magnetite Nanoparticles in Supercritical Water

2009 ◽  
Vol 48 (26) ◽  
pp. 4788-4791 ◽  
Author(s):  
Martin Bremholm ◽  
Marcella Felicissimo ◽  
Bo B. Iversen
Keyword(s):  
Supercritical Water ◽  
Magnetite Nanoparticles ◽  
Large Scale ◽  
Scale Production ◽  
Time Resolved ◽  
X Ray ◽  
Large Scale Production

scholarly journals Environmental Assessment of Large Scale Production of Magnetite (Fe3O4) Nanoparticles via Coprecipitation

2019 ◽  
Vol 9 (8) ◽  
pp. 1682 ◽  
Author(s):  
Steffy J. Arteaga-Díaz ◽  
Samir I. Meramo-Hurtado ◽  
Jeffrey León-Pulido ◽  
Antonio Zuorro ◽  
Angel D. González-Delgado
Keyword(s):  
Environmental Assessment ◽  
Magnetite Nanoparticles ◽  
Large Scale ◽  
Polymeric Materials ◽  
Scale Production ◽  
Large Scale Production ◽  
Magnetite Fe3o4 ◽  
Key Characteristics ◽  
Important Challenge ◽  
Negative Impacts

Nanoparticles are materials with special properties that can be applied in different fields, such as medicine, engineering, food industry and cosmetics. The contributions regarding the synthesis of different types of nanoparticles have allowed researchers to determine a special group of nanoparticles with key characteristics for several applications. Magnetite nanoparticles (Fe3O4) have attracted a significant amount of attention due to their ability to improve the properties of polymeric materials. For this reason, the development of novel/emerging large scale processes for the synthesis of nanomaterials is a great and important challenge. In this work, an environmental assessment of the large scale production of magnetite via coprecipitation was carried out with the aim to evaluate its potential impact on the environment at a processing capacity of 806.87 t/year of magnetite nanoparticles. The assessment was performed using a computer-aided tool based on the Waste Reduction Algorithm (WAR). This method allows us to quantify the impacts generated and classify them into eight different categories. The process does not generate any negative impacts that could harm the environment. This assessment allowed us to identify the applicability of the large scale production of magnetite nanoparticles from an environmental viewpoint.

Variables Involved in the Planting of Rice in the Rice Husk

2012 ◽  
Vol 517 ◽  
pp. 430-436
Author(s):  
J.L. Akasaki ◽  
E.J. Silva ◽  
L.C. Sousa ◽  
J.L.P. Melges ◽  
M.M. Tashima ◽  
...  
Keyword(s):  
Rice Husk ◽  
Large Scale ◽  
Rice Husk Ash ◽  
Scale Production ◽  
X Ray Diffraction ◽  
X Ray ◽  
Large Scale Production ◽  
Pozzolanic Materials ◽  
Different Strains ◽  
Different Origins

Rice production in Brazil in 2010 was approximately 12,2 million tons, and to reach that amount several planting techniques were used with different strains of rice in different rice-growing areas. Since Rice Husk Ash (RHA) is the pozzolan of vegetable origin most studied by researchers working in the area of pozzolanic materials, the present paper evaluates the influence that the form of planting, the climate, the soil, the strain of rice and the origin/amount of nitrogen-based fertilizers used in rice cultivation has on the chemical composition and crystallographic properties of RHA. The results obtained in this paper, confirm the importance of carrying out routine chemical analysis and X-Ray diffraction to maintain the quality control of the CCAs produced, because in situations of large-scale production, husks of different origins may be used.

scholarly journals SPINE-compatible `carboloops': a new microshaped vitreous carbon sample mount for X-ray and neutron crystallography

2014 ◽  
Vol 70 (5) ◽  
pp. 681-684 ◽  
Author(s):  
Filippo Romoli ◽  
Estelle Mossou ◽  
Maxime Cuypers ◽  
Peter van der Linden ◽  
Philippe Carpentier ◽  
...  
Keyword(s):  
Large Scale ◽  
Production Quality ◽  
Vitreous Carbon ◽  
Scale Production ◽  
X Rays ◽  
Macromolecular Crystallography ◽  
X Ray ◽  
Large Scale Production ◽  
Custom Design ◽  
High Standards

A novel vitreous carbon mount for macromolecular crystallography, suitable for neutron and X-ray crystallographic studies, has been developed. The technology described here is compatible both with X-ray and neutron cryo-crystallography. The mounts have low density and low background scattering for both neutrons and X-rays. They are prepared by laser cutting, allowing high standards of production quality, the ability to custom-design the mount to specific crystal sizes and large-scale production.

Programmatics of large scale production of silicon pore optics for future x-ray telescopes

2006 ◽  
Author(s):  
S. Kraft ◽  
M. Collon ◽  
M. W. Beijersbergen ◽  
M. Bavdaz ◽  
D. H. Lumb ◽  
...  
Keyword(s):  
Large Scale ◽  
Scale Production ◽  
X Ray ◽  
Large Scale Production

In Situ Time-Resolved X-Ray Diffraction Investigation of the ω→ψ Transition in Al-Cu-Fe Quasicrystal-Forming Alloys

2007 ◽  
Vol 558-559 ◽  
pp. 943-947 ◽  
Author(s):  
E. Otterstein ◽  
R. Nicula ◽  
J. Bednarčík ◽  
M. Stir ◽  
E. Burkel
Keyword(s):  
Large Scale ◽  
Applied Pressure ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
In Situ Xrd ◽  
Kinetics Of

Quasicrystals are aperiodic long-range ordered solids with a high potential for many modern applications. Interest is nowadays paid to the development of economically viable large-scale synthesis procedures of quasicrystalline materials involving solid-state transformations. The kinetics of the high-temperature phase transition from the complex ω-phase to the icosahedral quasicrystalline (iQC) ψ-phase in AlCuFe nanopowders was here examined by in-situ time-resolved X-ray diffraction experiments using synchrotron radiation. In-situ XRD experiments will allow insight on the influence of uniaxial applied pressure on the kinetics of phase transitions leading to the formation of single-phase QC nanopowders and further contribute to the optimization of sintering procedures for nano-quasicrystalline AlCuFe alloy powders.

scholarly journals Synthesis of polypeptides via bioinspired polymerization of in situ purified N-carboxyanhydrides

2019 ◽  
Vol 116 (22) ◽  
pp. 10658-10663 ◽  
Author(s):  
Ziyuan Song ◽  
Hailin Fu ◽  
Jiang Wang ◽  
Jingshu Hui ◽  
Tianrui Xue ◽  
...  
Keyword(s):  
Large Scale ◽  
Low Cost ◽  
Local Environment ◽  
Side Reactions ◽  
Scale Production ◽  
Competing Species ◽  
Natural Protein ◽  
Large Scale Production ◽  
Synthetic Polypeptides

Ribozymes synthesize proteins in a highly regulated local environment to minimize side reactions caused by various competing species. In contrast, it is challenging to prepare synthetic polypeptides from the polymerization of N-carboxyanhydrides (NCAs) in the presence of water and impurities, which induce monomer degradations and chain terminations, respectively. Inspired by natural protein synthesis, we herein report the preparation of well-defined polypeptides in the presence of competing species, by using a water/dichloromethane biphasic system with macroinitiators anchored at the interface. The impurities are extracted into the aqueous phase in situ, and the localized macroinitiators allow for NCA polymerization at a rate which outpaces water-induced side reactions. Our polymerization strategy streamlines the process from amino acids toward high molecular weight polypeptides with low dispersity by circumventing the tedious NCA purification and the demands for air-free conditions, enabling low-cost, large-scale production of polypeptides that has potential to change the paradigm of polypeptide-based biomaterials.

A New Synthetic Route to Nano Metal Oxides

2011 ◽  
Vol 675-677 ◽  
pp. 223-226
Author(s):  
Hong Zhao ◽  
Jin Hua Yao ◽  
Shu Bao Jin ◽  
Li Jun Liang
Keyword(s):  
Metal Oxides ◽  
Large Scale ◽  
Mixed Oxides ◽  
Scale Production ◽  
X Ray Diffraction ◽  
Mechanical Grinding ◽  
Energy Dispersion Spectroscopy ◽  
X Ray ◽  
Large Scale Production ◽  
Key Steps

Strong alkali anion exchange resin was employed as a hydroxyl source in the synthesis. OH- releasing rates were easily controlled by varying precursor salts, salt concentrations and temperatures, etc. The ratio between the nucleation speed and the speed of oxide crystallite growth was adjusted to favor the anisotropic growth of the crystal. Zinc and aluminum nano-sized oxide were obtained in various morphologies. X-ray diffraction (XRD), scanning electron microscope (SEM) and Energy Dispersion Spectroscopy (EDS) were employed to characterize the products. It is ascertained that the surface reaction on the resin and the mechanical grinding are the key steps in controlling the product morphology. The results show the flexibility and possibility of large scale production of various nano metal oxides and as well as mixed oxides.

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