An Original Process of Nanoporous Materials via Templating Nickel Phosphate Colloidal Particles

2008 ◽  
Vol 368-372 ◽  
pp. 1706-1708
Author(s):  
Ruo Bing Han ◽  
Chun Lei Wan ◽  
Hui Wu ◽  
Wei Pan
Keyword(s):  
Colloidal Particles ◽  
High Surface ◽  
High Surface Area ◽  
Nanoporous Materials ◽  
Spherical Particles ◽  
Precipitation Method ◽  
Porous Metals ◽  
Templating Method ◽  
Nickel Phosphate ◽  
Nanoporous Metal

A novel templating method for preparing nanoporous materials has been developed. Spherical nickel phosphate particles synthesized through a homogeneous precipitation method were used as templates after annealing to fabricate porous metals. Effort of annealing temperature on the morphology of the spherical particles and the structure of outcome materials were studied. Hierarchical nanoporous metal with a high surface area was obtained using a template annealed at 200 oC.

scholarly journals Nanoporous zirconia microspheres prepared by salt-assisted spray drying

2020 ◽  
Vol 2 (5) ◽  
Author(s):  
M. Skovgaard ◽  
M. Gudik-Sørensen ◽  
K. Almdal ◽  
A. Ahniyaz
Keyword(s):  
Spray Drying ◽  
Low Cost ◽  
Porous Ceramic ◽  
High Surface ◽  
High Surface Area ◽  
Industrial Applications ◽  
Spherical Particles ◽  
Templating Method ◽  
Wide Range ◽  
Zirconia Powders

Abstract Nanoporous zirconia with high surface area and crystallinity has a wide range of industrial applications, such as in inorganic exchangers for ion exchange columns, catalyst substrates, and packing material for HPLC. Spherical particles of crystalline nanoporous zirconia are highly desired in various industries due to easy handling of the materials in a fluidized bed. Here, spray drying was adopted to produce spherical nanoporous zirconia powders in both laboratory scale and pilot plant scale. Effect of salts on spray-dried ZrO2 powders and their crystallization behavior was studied. It was found that addition of salts to the zirconia precursors has a huge effect on the crystallization of nanoporous zirconia powders. These results have a great impact on the development of microspheres of nanocrystalline ZrO2 and potentially open up a new opportunity to the low-cost production of porous ceramic microspheres with the salt templating method, in general.

Hydroxyapatite as a bifunctional nanocatalyst for solventless Henry reaction: A demonstration of morphology dependent catalysis

2022 ◽  
Author(s):  
Smriti Mukherjee ◽  
Iyyappan E ◽  
Keerthi Satheesh ◽  
Elsa Maria Jordi ◽  
Saranya S ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Chemical Precipitation ◽  
Chemical Precipitation Method ◽  
Precipitation Method ◽  
Current Investigation ◽  
Henry Reaction

In the current investigation, HA nanorods and nanoplates with a high surface area have been synthesized using the chemical precipitation method via alcogel formation employing L-arginine as a crystal growth...

Synthesis of Nanoporous Materials Al-MCM-41 from Natural Halloysite

NANO ◽  
2015 ◽  
Vol 10 (01) ◽  
pp. 1550005 ◽  
Author(s):  
Yaling Xie ◽  
Aidong Tang ◽  
Huaming Yang
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Halloysite Nanotubes ◽  
Nanoporous Materials ◽  
Molar Ratio ◽  
Molar Ratios ◽  
Naoh Solution ◽  
The One ◽  
Mcm 41

Nanoporous materials Al -MCM-41 with varying Si / Al molar ratios have been successfully synthesized from natural clay mineral halloysite nanotubes (HNTs). Hydrothermal treatment of acid-pretreated HNTs and NaOH solution resulted in the one-step synthesis of final nanoporous products by using surfactant. The effects of Si / Al molar ratios (7.7, 61.0 and 176.5) on the surface area, porosity and degree of structural order of Al -MCM-41 materials have been investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), N 2 adsorption–desorption measurements and Fourier transform infrared (FTIR) spectra techniques. The results indicated that Si / Al molar ratio had important effect on the characteristics of nanoporous materials, and Al -MCM-41 with an intermediate Si / Al molar ratio of 61.0 exhibited excellent characteristics with high degree of order, high surface area (S BET ) of 1033 m2/g and pore volume of 0.92 mL/g.

Preparation and Characterization of Fibrous Cerium Oxide Templated from Activated Carbon Fibers

2005 ◽  
Vol 876 ◽  
Author(s):  
Mark Crocker ◽  
Uschi M. Graham ◽  
Rolando Gonzalez ◽  
Erin Morris ◽  
Gary Jacobs ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Cerium Oxide ◽  
Carbon Fibers ◽  
High Surface ◽  
Nitrate Solution ◽  
High Surface Area ◽  
Cerium Nitrate ◽  
Activated Carbon Fibers ◽  
Templating Method

AbstractHigh surface area cerium oxide has been prepared using a carbon templating method. Impregnation of a highly mesoporous activated carbon (Darco KB-B) with an aqueous solution of cerium nitrate, followed by carbon burn off, afforded ceria with surface area of up to 148 m2/g. According to thermogravimetric studies, ceria formation proceeds via decomposition of cerium nitrate at ca. 410 K; oxidation of the carbon template commences at the same temperature, being facilitated by the release of NO2 from the Ce compound. Use of activated carbon fibers (ACFs) as template was found to provide a simple route to fibrous cerium oxide. The lower surface areas (3 - 59 m2/g) of the resulting ceria fibers reflect the largely microporous nature of the ACFs; evidently the Ce nitrate solution is unable to penetrate their micropores. Consequently, the surface area of the ceria product is found to increase with increasing mesoporosity of the ACF template. Electron microscopy reveals that the ceria fibers are composed of highly crystalline primary particles of 5-10 nm diameter; further, the fibers display a number of interesting morphological features at the macro- and nano-scales.

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