Ultrathin free-standing membranes from metal hydroxide nanostrands

Design and function of biomimetic multilayer water purification membranes

“…4G) at 10 min is higher than 64.9%, superior to that found in other polymer-based membranes and similar to other types of protein-based ultrafiltration membranes, such as ferritin and SNF membranes ( 9 , 11 ). Although the membrane rejection for several compounds (that is, bovine serum albumin, Eosin B, and Orange G) drops significantly at an extremely large volume filtration (more than 1 liter, 24 hours of flow), the membranes exhibit higher water purification ability than do other water purification membranes ( 10 , 11 , 14 ) at hundred milliliter scale. Similar to other ultrafiltration membranes, the flow rates of dye solutions decline gradually with the increase of filtration time (Fig.…”

“…A more detailed discussion about dye separation and adsorption performance of SNF/HAP membranes can be found in section S9. Figure 4H compares the separation efficiencies of SNF/HAP membranes for 5-nm gold nanoparticles with other water purification membranes reported in the literature ( 4 – 6 , 10 , 11 , 14 , 15 , 17 , 21 ). The SNF/HAP membranes extend the “instep” pattern of the reported thickness versus flux relationship and exhibit a more effective integration of thickness, flux, and separation performance.…”

Facile Fabrication, Structure, and Applications of Polyvinyl Chloride Mesoporous Membranes

“…10,11 Thin-film composite membranes involving a thin separation layer on a submicrometer porous support generally show an ultrahigh permeation flux during pressure-driven filtration. 12,13 For example, the membrane with a ∼0.85 μm-thick chemically cross-linked poly(vinyl alcohol) layer has a water flux that is 5 times higher than that of the commercial PAN10 membrane. 14 The membrane with a ∼0.15-μm-thick cross-linked poly(4-vinylpyridine) layer has a water flux of 583 L m −2 h −1 bar −1 and a good rejection for cytochrome c. 15 The membrane with a ∼0.35 μm-thick cellulose layer has a permeation flux that is significantly higher (∼10 times) than that of the commercial ultrafiltration membranes for separation of oil/water emulsions.…”

Ultrathin pH‐Sensitive Nanoporous Membranes for Superfast Size‐Selective Separation

“…The copper hydroxide nanostrands have awidth of 2.5 nm and alength of few micrometersw ith particularly abundant positive charges on their surface. [24] Negatively charged water-soluble molecules can be adsorbed onto the nanostrand surfaceb ye lectrostatic interactions. By exploiting this property,P AA chains will adsorb onto the nanostrand surfacel eadingt ot he formation of aP AA-adsorbed layer (Figure 2a).…”

“…Apparently,P AA-adsorbed nanostrands and PAA-Cu II nanogels are observed simultaneously,a nd uniformly dispersed in the solution.T oc onfirm this, their diameters were estimated from the TEM images (Figure 2c,d). Obviously,t he PAA-adsorbed nanostrands are bigger than the non-adsorbed nanostrands (2.5 nm in diameter), [24] and have an average diameter of about 2.95 nm using a1 0.0 mgmL To study the mechanism of PAAs elf-assembly,U V/Vis spectrophotometry and SEM were employed to investigate the effect of PAAc oncentration on PAAs elf-assembly.F igure S3 shows the UV/Vis spectra of nanostrand solution and its PAA solutions. It is found that the UV/Vis spectrum of the nanostrand solutioni sa lmost identicalt ot hat of the 2.52 nm-diameter CuC 6 nanoparticle solutions, suggesting that the nanostrandsh ave the same diameter of about 2.5 nm.…”