Composite Membrane of Niobium(V) Oxide and Cellulose Acetate: Preparation and Characterization

Campos, E.; Gushikem, Yoshitaka

doi:10.1006/jcis.1997.5051

Cited by 32 publications

(23 citation statements)

References 21 publications

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“…In contrast, the CA/Rh(0) polymeric membrane ( Figure 1b) seems to have a scaled and porous structure. This result is in agreement with the general concept that imidazolium IL tend to act as entropic drivers for the formation nanostructure materials [44,45] . Figures 1 and 2 shows that the CA/IL/Rh(0) and CA/ IL/Pt(0) films exhibit a skin that is relatively porous on the top side and a relatively porous structure over all of the polymeric membranes cross-sections.…”

Section: Resultssupporting

confidence: 92%

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Metal Nanoparticles/Ionic Liquid/Cellulose: Polymeric Membrane for Hydrogenation Reactions

Gelesky

Scheeren

2014

Polímeros

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Rhodium and platinum nanoparticles were supported in polymeric membranes with 10, 20 and 40 μm thickness. The polymeric membranes were prepared combining cellulose acetate and the ionic liquid (IL) 1-n-butyl-3-methylimidazolium bis(trifluoromethane sulfonyl)imide (BMI.(NTf) 2 . The presence of metal nanoparticles induced an increase in the polymeric membrane surface areas. The increase of the IL content resulted in an improvement of elasticity and decrease in tenacity and toughness, whereas the stress at break was not affected. The presence of IL probably causes an increase in the separation between the cellulose molecules that result in a higher flexibility and processability of the polymeric membrane. The CA/IL/M(0) combinations exhibit an excellent synergistic effect that enhances the activity and durability of the catalyst for the hydrogenation of cyclohexene. The CA/IL/M(0) polymeric membrane displays higher catalytic activity (up to 7.353 h -1 ) for the 20 mm of CA/IL/Pt(0) and stability than the nanoparticles dispersed only in the IL.

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Section: Resultssupporting

confidence: 92%

“…The solvent was evaporated in an open atmosphere for 2 min. A similar method was used to prepare blank CA polymeric membrane, except that no Rh(0) or Pt(0) nanoparticles were used [45][46][47][48] .…”

Section: Preparation Of Polymeric Membranementioning

confidence: 99%

Metal Nanoparticles/Ionic Liquid/Cellulose: Polymeric Membrane for Hydrogenation Reactions

Gelesky

Scheeren

2014

Polímeros

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“…In contrast, addition of the IL seems to cause an increase in the microstructural order in the CS/CMC/IL (Figure 4(b)). This result is in agreement with the general concept that imidazolium IL tends to act as entropic drivers for the formation nanostructured materials [21,34]. Figure 5 shows that the structure CS/CMC/IL/Ag(0) polymeric membrane exhibits a skin that is relatively porous on the top side and a relatively porous structure over all of the film cross-sections.…”

Section: Resultssupporting

confidence: 88%

Chitosan/Carboxymethylcellulose/Ionic Liquid/Ag(0) Nanoparticles Form a Membrane with Antimicrobial Activity

Quadros

Faria

Klein

et al. 2013

Journal of Nanotechnology

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Silver metal nanoparticles were immobilized in chitosan/carboxymethylcellulose/BMI.BF 4 (1-n-butyl-3-methylimidazolium tetrafluoroborate ionic liquid) (CS/CMC/IL) to form polymeric membrane with 20 m thickness. The CS/CMC/IL polymeric membrane was prepared using a simple solution blending method. Irregularly shaped Ag(0) nanoparticles with monomodal size distributions of 8.0 ± 0.4 nm Ag(0) were immobilized in the membrane. The presence of small Ag(0) nanoparticles induced an augmentation in the CS/CMC/IL film surface areas. The CS/CMC/IL membrane containing Ag(0) showed increase antimicrobial activity the Ag(0) concentration increased up to saturation at 10 mg. CS/CMC/IL membrane that contains Ag(0) nanoparticles has enhanced durability of the membrane and exhibited stronger antimicrobial activity against Escherichia coli and Staphylococcus aureus.

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“…After sieving and drying, the solids were crushed with a ball mill (QM-ISP04, Nanjing University Instruments Co., Nanjing, China) to get MCC powder. To check the effects of different acid concentrations (v/v) and various reaction times on the degree of polymerization and crystallinity of the products, five acid concentrations (16,18,20,22, and 24%) with a reaction time of 3 h and five tested reaction times (2, 2.5, 3, 3.5, and 4 h) with an acid concentration of 20% were tested.…”

Section: Preparation Of MCCmentioning

confidence: 99%

“…15 A metal oxide (Nb 2 O 5 ) in the cellulose acetate matrix can improve the electrochemical properties of the membrane. 16 Cellulose nanocrystals have also been used to improve the performances of PS ultrafiltration membranes. 17 The addition of Aerosil fillers to a PS and N-methylpyrrolidone solution has been shown to have a big influence on the membrane-formation process.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of composite membranes of polysulfone and microcrystalline cellulose

Zhang

Chen

Tang

et al. 2009

J of Applied Polymer Sci

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in Wiley InterScience (www.interscience.wiley.com).ABSTRACT: Physical and chemical modifications of polymeric ultrafiltration membranes are necessary to improve their hydrophilic properties, strength, and other characteristics. Microcrystalline cellulose (MCC) was prepared from cellulose pulp by acid-catalyzed hydrolysis in the presence of ultrasonic radiation, and the properties of MCC were evaluated. Through the addition of MCC to a polysulfone (PS) membrane solution, a casting solution of a PS/MCC blend was obtained. Subsequently, the ultrafiltration membrane from the blend was further developed in a phaseinversion process comprising immersion and deposition.The capacity for ultrafiltration was better with increasing MCC content. When the ratio of MCC to PS was 0.3, the pure water flux of the composite membrane reached 234.2 L/m 2 /h, and the retention of a bovine serum albumin solution (1 g/L) was as high as 93.4%. The membranes were also observed with scanning electron microscopy and atomic force microscopy to study their microstructures.

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Composite Membrane of Niobium(V) Oxide and Cellulose Acetate: Preparation and Characterization

Cited by 32 publications

References 21 publications

Metal Nanoparticles/Ionic Liquid/Cellulose: Polymeric Membrane for Hydrogenation Reactions

Metal Nanoparticles/Ionic Liquid/Cellulose: Polymeric Membrane for Hydrogenation Reactions

Chitosan/Carboxymethylcellulose/Ionic Liquid/Ag(0) Nanoparticles Form a Membrane with Antimicrobial Activity

Preparation and characterization of composite membranes of polysulfone and microcrystalline cellulose

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