Untitled

Abstract. Microcrystalline cellulose is a porous natural material which can be used both as a support for nanoparticles and as a reducer of metal ions. Cellulose supported nanoparticles can act as catalysts in many reactions. Cu, CuO, and Cu2O particles were prepared in microcrystalline cellulose by adding a solution of copper salt to the insoluble cellulose matrix and by reducing the copper ions with several reducers. The porous nanocomposites were studied using anomalous small angle x-ray scattering (ASAXS), x-ray absorption spectroscopy, and x-ray diffraction. Reduction of Cu 2+ with cellulose in ammonium hydrate medium yielded crystalline CuO nanoparticles and the crystallite size was about 6 -20 nm irrespective of the copper concentration. The size distribution of the CuO particles was determined with ASAXS measurements and coincided with the crystallite sizes. Using sodium borohydrate or hydrazine sulfate as a reducer both metallic Cu and Cu2O nanoparticles were obtained and the crystallite size and the oxidation state depended on the amount of reducer.

show abstract

“…Similar results have been obtained when nickel and silver nanoparticles were intercalated into MCC using various reducing systems [8,38].…”

Section: Discussionsupporting

confidence: 84%

Copper and copper oxide nanoparticles in a cellulose support studied using anomalous small-angle X-ray scattering

et al. 2007

View full text Add to dashboard Cite

show abstract

“…37 Both cellulose and amines are mild reducing agents, which may reduce Ag + ions to Ag(0). [38][39][40][41][42] However, the reduction of Ag ions by AMC itself is very slow at lower temperature, e.g., 24 h at RT (Table 1). Unfortunately, these Ag solutions prepared at RT for 24 h as well as those prepared at 50 °C for 4 h are not stable.…”

Section: Aqueous Colloidal Solutions Of Aminocellulose-stabilised Sil...mentioning

confidence: 99%

Synthesis and antibacterial effects of aqueous colloidal solutions of silver nanoparticles using aminocellulose as a combined reducing and capping reagent

et al. 2013

View full text Add to dashboard Cite

A simple, environmentally friendly and cost-effective synthetic method has been developed to prepare highly stable aqueous colloidal solutions of small (2–14 nm) silver nanoparticles using aminocellulose (AMC) as a combined reducing and capping reagent. The effects of temperature, reaction time, the concentration of silver nitrate and AMC are systematically investigated and the reaction conditions optimised. The AMC-stabilized silver nanoparticles can be deposited on the surfaces of cotton fibres and microporous cellulose acetate (CA) filters, without affecting the permeability of the filters. The AMC-stabilized aqueous silver colloidal solutions and silver nanoparticle coated CA filters and cotton fibres all show significant antibacterial action against all the bacterial isolates tested, with the antibacterial levels between “Sufficient” and “Good”, although some of solutions have been stored at room temperature for 18 months

show abstract

“…X-Ray diffraction is very useful for the analysis of metallic nanostructures formed using crystalline cellulose nanofibrils as the XRD pattern of crystalline cellulose is well known and it may allow us to investigate the effect of the reduction reaction on the nanofibrils. The reduction of Ag + to Ag by polysaccharides occurs via the reducing end groups of cellulose 35,36 and previous work has suggested that polysaccharide-based reducing agents decompose during reaction with metal ions. 37 However, other work has also shown that crystalline cellulose can retain its composition during reduction of metal ions.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Nanocomposite oxygen reduction electrocatalysts formed using bioderived reducing agents

2010

View full text Add to dashboard Cite

Untitled

Cited by 22 publications

References 3 publications

Copper and copper oxide nanoparticles in a cellulose support studied using anomalous small-angle X-ray scattering

Copper and copper oxide nanoparticles in a cellulose support studied using anomalous small-angle X-ray scattering

Synthesis and antibacterial effects of aqueous colloidal solutions of silver nanoparticles using aminocellulose as a combined reducing and capping reagent

Nanocomposite oxygen reduction electrocatalysts formed using bioderived reducing agents

Contact Info

Product

Resources

About