Wet Foam Stabilized by Amphiphiles to Tailor the Microstructure of Porous Ceramics

2012 ◽  
Vol 512-515 ◽  
pp. 288-292 ◽  
Author(s):  
Ashish Pokhrel ◽  
Wei Zhao ◽  
Ik Jin Kim
Keyword(s):  
Contact Angle ◽  
Pore Size ◽  
Particle Concentration ◽  
Foam Stability ◽  
Porous Ceramics ◽  
Porous Solid ◽  
Combined Effects ◽  
Direct Foaming ◽  
Amphiphilic Particles

Wet foams formed through direct foaming were stabilized using various concentrations of amphiphilic particles that could control pore size and porosity. Microstructures and wet foam stability were tailored by amphiphile concentration, particle concentration, contact angle and pH of the suspension to obtain crack-free porous solid after sintering. The influence of these parameters on the porosity was satisfactorily described in terms of combined effects of the contact angle and particle concentration of the initial suspensions, directly affected by amphiphile concentration. Pores were obtained with sizes of c. a 30 - 300 µm and porosities of over 80%.

Fabrication of Porous Al2O3 Ceramics by Freeze Drying Technique and Annealing Treatment

2016 ◽  
Vol 848 ◽  
pp. 272-278 ◽  
Author(s):  
Sha Qiu ◽  
Yu Fei Tang ◽  
Kang Zhao
Keyword(s):  
Compressive Strength ◽  
Pore Structure ◽  
Pore Size ◽  
Annealing Time ◽  
Open Porosity ◽  
Sucrose Solution ◽  
Annealing Treatment ◽  
Porous Ceramics ◽  
Crystalline Solid ◽  
Directional Freezing

Porous Al2O3 ceramics were fabricated by directional freezing and low pressure drying with sucrose solution as the cryogenic medium. The pore structure of the porous ceramics was changed by annealing in the environment of higher than the glass transition temperature of sucrose solution after directional freezing because of changing the size and distribution of crystalline solid. The effects of the annealing time on the pore structure, open porosity and mechanical property of porous ceramics were investigated. The results showed that the pore size of porous ceramics increased substantially with the increase of annealing time. The open porosity of porous ceramics changed slightly with the increase of annealing time, while the compressive strength of porous ceramics showed a trend of decrease. The pore size range of porous Al2O3 ceramics fabricated is from 6.0μm to 110.2μm, the range of porosity was 40.35%-64.58%, the compressive strength range of porous Al2O3 ceramics was from 25.9MPa-126.6MPa. The porous Al2O3 ceramics with different pore structure can be obtained by changing the annealing time.

scholarly journals Pore Size and Bulk Density as Mechanical Soil Factors Impeding Root Development

1969 ◽  
Vol 44 (1) ◽  
pp. 40-44
Author(s):  
M. A. Lugo-López
Keyword(s):  
Pore Size ◽  
Bulk Density ◽  
Root Development ◽  
Clay Soils ◽  
Combined Effects ◽  
Soil Horizons ◽  
Soil Factors ◽  
High Bulk Density ◽  
Guinea Grass ◽  
High Bulk

Measurements of pore size and bulk density for seven clay soils are reported in this paper as related to observations on root development under field conditions of Para, Guinea, and Bermuda grasses. The combined effects of high bulk density and predominantly small pores apparently reduce root development in Para and Bermuda. Guinea grass, a dryland forage, is able to send roots through relatively dense soil horizons with high microporosity. This might explain, at least in part, the drought tolerance of this grass.

Combined Effects of Surface Charge and Pore Size on Co-Enhanced Permeability and Ion Selectivity through RGO-OCNT Nanofiltration Membranes

2018 ◽  
Vol 52 (8) ◽  
pp. 4827-4834 ◽  
Author(s):  
Haiguang Zhang ◽  
Xie Quan ◽  
Shuo Chen ◽  
Xinfei Fan ◽  
Gaoliang Wei ◽  
...  
Keyword(s):  
Surface Charge ◽  
Pore Size ◽  
Ion Selectivity ◽  
Combined Effects ◽  
Nanofiltration Membranes

Preparation of Porous Wollastonite Ceramics for Filtration

2007 ◽  
Vol 336-338 ◽  
pp. 1102-1104 ◽  
Author(s):  
Ming Sheng He ◽  
Jian Bao Li ◽  
Bo Wen Li ◽  
Hong Lin ◽  
Xiao Zhan Yang ◽  
...  
Keyword(s):  
Specific Surface ◽  
Pore Size ◽  
Surface Area ◽  
Specific Surface Area ◽  
Sintering Temperature ◽  
Porous Ceramics ◽  
Holding Time ◽  
Starting Material ◽  
Sintering Method

Wollastonite powder was selected as a starting material with carbonate as pore-forming agent and binder added. The porous ceramics were prepared at different temperature by sintering method. The process includes batching, granulating, pressing molding, drying and sintering. It is discussed the influence of sintering temperature, dosage of binder, dosage of pore-forming agent, pressure of molding and holding time on the performance of porous ceramics. According to the principle of particles stack, the porous wollastonite ceramics for filtration with various diameters, shapes and porosity were fabricated by serial experiments. These products have 1 to 10 microns in pore size, 30.04 to 66.15% in porosity, 2.82 m2/g in specific surface area.

ZrTiO4 porous ceramics fabricated from particle-stabilized wet foam by direct foaming

2016 ◽  
Vol 68 (1) ◽  
pp. 77-82 ◽  
Author(s):  
Subhasree Bhaskar ◽  
Jung Gyu Park ◽  
Ik Jin Kim ◽  
Byung Ho Kang ◽  
Tae Young Lim
Keyword(s):  
Porous Ceramics ◽  
Direct Foaming

Porous ceramics with tailored pore size and morphology as substrates for coral larval settlement

2018 ◽  
Vol 44 (14) ◽  
pp. 16561-16571 ◽  
Author(s):  
Marieke M. Hoog Antink ◽  
Lisa Röpke ◽  
Julia Bartels ◽  
Christian Soltmann ◽  
Andreas Kunzmann ◽  
...  
Keyword(s):  
Pore Size ◽  
Larval Settlement ◽  
Porous Ceramics ◽  
Size And Morphology
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