Determination of pore size and pore size distribution

Sakai, Kiyotaka

doi:10.1016/0376-7388(94)00127-8

Cited by 143 publications

(69 citation statements)

References 96 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Different types of membranes and the separation processes done are also based on pore size distribution or correctly speaking on molecular sieve sizes. Microfiltration (100÷5000 nm), ultrafiltration (5÷50 nm), dialysis (2÷5 nm) and reverse-osmotic membranes (0.2÷0.5 nm) are well distinguished [17] in this field.…”

Section: Pore Size Categoriesmentioning

confidence: 99%

Pore classification in the characterization of porous materials: A perspective

et al. 2007

View full text Add to dashboard Cite

Classification of pores is one of the basic requisites of comprehensive characterization of porous solids. There are various categorizations of pores described in the literature, but it is difficult to give a consistent global classification of porous substances including catalysts, adsorbents, oxides, carbons, zeolites, organic polymers, soils etc. The purpose of each of these classifications is to organize pores in classes by grouping them on the basis of their common characteristics like structure, size, accessibility, shape etc. In this study, a summary of the most used classifications of porous materials is done. Some common properties or behavior for individual classifications could be found, but many differences mainly in pore size are still subject of intensive discussions. Therefore, it is the purpose of this review to provide a general description of the concept and classification of pores in porous solids, to deal with complexity of the matter and to organise our knowledge in decision-making proccesses of pore characteristics determination.

show abstract

Section: Pore Size Categoriesmentioning

confidence: 99%

Pore classification in the characterization of porous materials: A perspective

et al. 2007

View full text Add to dashboard Cite

show abstract

“…These methods were reviewed by Sarbolouki 30 and Sakai. 31 To deduce the reason for the differences in performance between NMMO and cuprammonium membranes, we analyzed the membrane pore structure (average pore radius and pore number) obtained from the hydraulic permeation theory. According to the Guérout-Elford-Ferry formula, 28 we estimated the pore structure for both membranes.…”

Section: Pore Structure Of the Membranesmentioning

confidence: 99%

Hemodialysis membrane prepared from cellulose/N‐methylmorpholine‐N‐oxide solution. II. Comparative studies on the permeation characteristics of membranes prepared from N‐methylmorpholine‐N‐oxide and cuprammonium solutions

Abe

Mochizuki

2003

J of Applied Polymer Sci

View full text Add to dashboard Cite

Two kinds of regenerated cellulose membranes for hemodialysis were prepared from casting solutions of N-methylmorpholine-N-oxide (NMMO) and cuprammonium (denoted NMMO membranes and cuprammonium membranes, respectively). The concentration of cellulose in the casting solution investigated was 6 -8 wt %. The permeation characteristics of both membrane series were compared in terms of the ultrafiltration rate (UFR) of pure water, the sieving coefficient (SC) of dextran, and the solute permeabilities of urea, creatinine, and vitamin B 12 . The UFR and SC of the NMMO membranes were strongly affected by the cellulose concentration of the casting solution, and NMMO was a preferable solvent for the production of cellulose membranes with high performance; the cuprammonium solution gave low-performance membranes. The pore structures of both types of membranes were estimated with the Hagen-Poiseuille law. The results showed that the NMMO membranes had larger pore radius and smaller pore numbers than the cuprammonium membranes. The differences in the membrane pore structures led to the differences in the performance between the two membrane series.

show abstract

“…[1][2][3][4][5][6][7] Semipermeable membranes are the most important part of hemodialysis devices for removing certain uremic toxin substances from the blood of kidney patients. 8,9 Several polymeric materials such as polyamide, polysulfone, cellulose acetate, poly(ether sulfone), and regenerated cellulose [10][11][12][13][14][15] are widely employed for the preparation of hemodialysis membranes. Because of its superior permeability and blood compatibility, poly(vinyl alcohol) (PVA) is used as a basic material for a variety of biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

Hemodialysis membranes prepared from poly(vinyl alcohol): Effects of the preparation conditions on the morphology and performance

Barzin

Madaeni

Pourmoghadasi

2007

J of Applied Polymer Sci

View full text Add to dashboard Cite

Poly(vinyl alcohol) was employed for the preparation of hemodialysis membranes with and without the addition of acetic acid and poly(ethylene glycol) with the phase-inversion process. Aqueous solutions of sodium sulfate and sodium hydroxide were chosen as coagulant baths. The performances of the membranes were estimated by the measurement of the removal of uremic toxins (urea, uric acid, and creatinine) from human blood serum. The morphologies of the membranes were investigated and correlated to the membrane performance. Increasing the poly(ethylene glycol) concentration in the polymer solutions resulted in porous, spongelike structures because of the higher polarity of the polymer solutions and the enhancement of the diffusion rate of the nonsolvent (sodium sulfate and sodium hydroxide) into the polymer solutions. The porous structures of the membranes enhanced the removal of uremic toxins. The presence of acetic acid, with greater ionization strength, resulted in higher electrostatic interactions between positive and negative ions in the coagulation baths and polymer solutions.

show abstract

Determination of pore size and pore size distribution

Cited by 143 publications

References 96 publications

Pore classification in the characterization of porous materials: A perspective

Pore classification in the characterization of porous materials: A perspective

Hemodialysis membrane prepared from cellulose/N‐methylmorpholine‐N‐oxide solution. II. Comparative studies on the permeation characteristics of membranes prepared from N‐methylmorpholine‐N‐oxide and cuprammonium solutions

Hemodialysis membranes prepared from poly(vinyl alcohol): Effects of the preparation conditions on the morphology and performance

Contact Info

Product

Resources

About