New and conventional pore size tests in virus-removing membranes

Duek, Aviv; Arkhangelsky, Elizabeth; Krush, Ronit; Brenner, Asher; Gitis, Vitaly

doi:10.1016/j.watres.2011.12.058

Cited by 40 publications

(9 citation statements)

References 39 publications

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“…MS2 is a single-stranded RNA virus with a diameter of 25-27 nm and an IEP of 3.9 [12,37]. PhiX174 is a single-stranded DNA virus with a diameter of 26-32 nm and an IEP of 6.6 [12,37]. These viruses belong to the smallest viruses and therefore, filtrations based on size exclusion principle can be ideally investigated.…”

Section: Virus Retention Testmentioning

confidence: 99%

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Production of ceramic membranes with different pore sizes for virus retention

Werner

Besser

Brandes

et al. 2014

Journal of Water Process Engineering

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Section: Virus Retention Testmentioning

confidence: 99%

“…membranes). Filtration is based on size exclusion effects and therefore, contaminants which are larger than the membrane pore size can be effectively retained [12,13]. A virus removal using ceramic filters made of raw materials (e.g.…”

Section: Introductionmentioning

confidence: 99%

Production of ceramic membranes with different pore sizes for virus retention

Werner

Besser

Brandes

et al. 2014

Journal of Water Process Engineering

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“…Interaction of the particles with bacterial DNA may result in bacteriostatic action, preventing cell reproduction (3). Antibacterial properties of AgNPs can be shown against a large spectrum of microorganisms including gram-positive and gram-negative bacteria (5), fungi (6) and viruses (7).…”

Section: Introductionmentioning

confidence: 99%

Development of Intracanal Formulation Containing Silver Nanoparticles

et al. 2014

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This study aimed to synthetize, characterize and evaluate the antimicrobial properties of silver nanoparticles to be used in the development of a root intracanal formulation. Silver nanoparticles (AgNPs) were obtained by reduction of silver nitrate with sodium borohydride and characterized by UV-Visible spectrophotometry, scanning electron microscopy (SEM) and dynamic light scattering (DLS). The antimicrobial activity of nanoparticle formulation was evaluated by determinations of the minimum inhibitory concentration (MIC) and minimal bactericidal concentration (MBC) against different bacterial species by the microdilution method, according to recommendations of the Clinical and Laboratory Standards Institute (CLSI). Three potential vehicles, hydroxyethylcellulose, Carbomer and polyethylene glycol were tested as carriers for formulations containing AgNPs. The efficiency of the synthesis method chosen to produce AgNPs was demonstrated by four characterization techniques. The nanoparticles showed antibacterial activity against all species tested. Incorporation of AgNPs into all experimental vehicles produced stable formulations but the one in hydroxyethylcellulose presented better physical proprieties. The results indicate that silver nanoparticles are potential antiseptic agents to be used in root canals and incorporation in adequate vehicles may favor a broader application.

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“…The IEP value of MS2 bacteriophage in different environments, based on the averaging of 10 measurements, shows a mean IEP value of 3.5 ± 0.6 and with the discrepancy in IEP (ΔIEP) of 1.8 from 2.2 to 4.0 [34]. Recent studies by Duek et al [35] and Chrysikopoulos et al [36] determined the alteration of the IEP by a change in water chemistry (e.g., ionic strength or ionic composition) with IEP of the former case in the range from less than 2 at ionic strengths of 0.0 mM and 2.6 mM to IEP of 4.4 in the latter case that was measured in double distilled water. In the case where clean colloidal particles are suspended in absolute pure water, the point of zero charge (PZC), which is characteristic to the particle's surface, can be determined.…”

Section: Virus and Bacteria Isoelectric Pointsmentioning

confidence: 98%

“…The IEP and the PZC do not necessarily differ in the presence of monovalent ions; however, the PZC is very difficult to measure experimentally [34]. MS2 (ATCC 15597-B1) and fr (ATCC 15767-B1) bacteriophages are icosahedral in shape with a diameter of 26-27 nm [35] and 19 nm [37], respectively. The isoelectric point of fr bacteriophage is 8.9-9.0 [37].…”

Section: Virus and Bacteria Isoelectric Pointsmentioning

confidence: 99%

Long-range attractive forces extending from the alumina’s nanolayer surface in aqueous solutions

Kaledin

Tepper

Kaledin

2015

International Journal of Smart and Nano Materials

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Aluminum oxide-hydroxide nanolayer with a thickness of approximately 1.2 nm is electroadhesively deposited onto silicious support material with large surface area of about 50 m 2 /g, forming a highly electropositive composite of boehmite nanolayer in the form of monocrystalline oxide/hydroxide (α-Al 2 O 3 ·H 2 O) on the second electronegative solid. The composite can be viewed as a sphere with a rough surface and charge density of approximately 0.08 C/m 2 . This creates a significant electric field with negligible screening (ka ( 1) in the region close to the surface of the nanocomposite. This field attracts nano-and micron-sized particles from as far as 200 μm in a few seconds, many orders of magnitude greater than conventional Derjaguin-LandauVerwey-Overbeek (DLVO) theory, which predicts only nanometer-scale effects arising from the presence of the surface. The strong electric field on the surface is then able to retain small particles such as viruses, atomically thin sheets of graphene oxide, RNA, DNA, proteins, dyes as well as heavy metals such as cobalt, arsenic, and lead.Alumina's nanolayer surface can be further functionalized by adding other submicron or nano-sized particles to target a specific contaminant. An example is shown where alumina nanolayer is coated with nano-sized iron monohydrate to yield an arsenic sorbent that shows high sorption capacity.

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New and conventional pore size tests in virus-removing membranes

Cited by 40 publications

References 39 publications

Production of ceramic membranes with different pore sizes for virus retention

Production of ceramic membranes with different pore sizes for virus retention

Development of Intracanal Formulation Containing Silver Nanoparticles

Long-range attractive forces extending from the alumina’s nanolayer surface in aqueous solutions

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