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Controllable Pore Sizes (controllable + pore_size)

Distribution by Scientific Domains

Polymers and Materials Science	80%

Selected Abstracts

High Surface Area, Mesoporous, Glassy Alumina with a Controllable Pore Size by Nanocasting from Carbon Aerogels

CHEMISTRY - A EUROPEAN JOURNAL, Issue 5 2005
Wen-Cui Li Dr.
Abstract A strategy to synthesize amorphous, mesoporous alumina by nanocasting has been developed, involving carbon aerogel as a hard template and aluminum nitrate solution as an alumina precursor. The alumina generated exhibits small, transparent granules with a 3,6 mm diameter and has inherited the three-dimensional network structure of the carbon template. The mesopore surface area of the alumina can be as high as 365 m2,g,1, and the pore volume reaches 1.55 cm3,g,1 after calcination at 600,°C in air for 8 h. The pore parameters can be varied within a certain range by variation of the carbon aerogel template and the loading amount of the alumina precursor. At high loadings, the obtained glassy alumina clearly has a bimodal pore size distribution in the mesopore range. [source]

Mesoporous Anatase TiO2 Beads with High Surface Areas and Controllable Pore Sizes: A Superior Candidate for High-Performance Dye-Sensitized Solar Cells

ADVANCED MATERIALS, Issue 21 2009
Dehong Chen
Mesoporous anatase TiO2 beads with high surface areas and controllable pore sizes are prepared by using a combined sol,gel and solvothermal process. Dye-sensitized solar cells made from these mesoporous beads gave a total power conversion efficiency of 7.20% under AM 1.5 sunlight, higher than that obtained using Degussa P25 films of similar thickness (5.66%). [source]

Formation of Chiral Mesopores in Conducting Polymers by Chiral-Lipid-Ribbon Templating and "Seeding" Route,

ADVANCED FUNCTIONAL MATERIALS, Issue 18 2008
Chaxing Fan
Abstract Conducting polymer nanofibers with controllable chiral mesopores in the size, the shape, and handedness have been synthesized by chiral lipid ribbon templating and "seeding" route. Chiral mesoporous conducting poly(pyrrole) (CMPP) synthesized with very small amount of chiral amphiphilic molecules (usually,<,3%) has helically twisted channels with well-defined controllable pore size of 5,20,nm in central axis of the twisted fibers. The structure and chirality of helical mesopores have been characterized by high-resolution transmission electron microscope (HRTEM), scanning electron microscope (SEM) and electron tomography. The average pore diameters of chiral mesopores were approximately estimated from the N2 adsorption,desorption data and calculated by the conversion calculation from helical ribbons to a rectangular straight tape. The pore size of CMPP has been controlled by choosing different alkyl chain lengths of chiral lipid molecules or precisely adjusting the H2O/EtOH volume ratio. [source]

Macroporous Silicon Microcavities for Macromolecule Detection,

ADVANCED FUNCTIONAL MATERIALS, Issue 11 2005
H. Ouyang
Abstract Macroporous silicon microcavities for detection of large biological molecules have been fabricated from highly doped n-type silicon. Well-defined controllable pore sizes up to 120,nm have been obtained by systematically optimizing the etching parameters. The dependence of the sensor sensitivity on pore size is discussed. Excellent infiltration inside these macroporous silicon microcavities is demonstrated using 60,nm diameter latex spheres and rabbit IgG (150,kDa; 1Da,=,1,g,mol,1). The sensing performance of the device is tested using a biotin/streptavidin couple, and protein concentration down to 1,2,,M (equivalent to 0.3,ng,mm,2) could be detected. Simulations show that the sensitivity of the technique is currently approximately 1,2,% of a protein monolayer. [source]

Mesoporous Anatase TiO2 Beads with High Surface Areas and Controllable Pore Sizes: A Superior Candidate for High-Performance Dye-Sensitized Solar Cells