Selective Protection of Carbonyl Compounds over Nano-sized Nickel Catalysts

Kumar, Ajeet; Kumar, Santosh; Saxena, Amit; De, Arnab; Mozumdar, Subho

doi:10.1007/s10562-007-9349-5

Cited by 19 publications

(7 citation statements)

References 27 publications

(39 reference statements)

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“…23,24 We have synthesized and used nanoparticles for various other applications as well. [25][26][27][28][29][30][31] Preparation of other nanoparticles is ongoing in our laboratory and the results will be disclosed in additional publications soon.…”

Section: Discussionmentioning

confidence: 99%

Facile synthesis of size-tunable copper and copper oxide nanoparticles using reverse microemulsions

et al. 2013

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The synthesis of pure metal and metal-oxide nanoparticles of a desired size remains a significant challenge.We describe a novel, simple and convenient method for the synthesis of copper and copper(II) oxide nanoparticles with tailored sizes at room temperature from a common copper(II) salt (CuSO 4 ?5H 2 O) in TX-100/n-hexanol/cyclohexane/water by a reverse microemulsion route. It was found that reduction with hydrazine hydrate (reduction potential 1.15 V) in an inert N 2 environment gives copper nanoparticles whereas reaction with sodium borohydrate (reduction potential 1.24 V) in aerobic condition gives copper(II) oxide nanoparticles. Several parameters were modulated to examine their effects on the structural properties of nanoparticles, namely the size and morphology of the nanoparticles. The size of the copper and copper(II) oxide nanoparticles can be easily controlled by changing the molar ratio of water to surfactant or by altering the concentration of the reactants. The nanoparticles were characterized using a variety of analytical techniques like X-ray diffraction (XRD), quasi elastic light scattering (QELS), UV-visible absorption spectroscopy, transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDAX). Our studies reveal that the nanoparticles are spherical in shape and have an average size distribution of 5-100 nm. Our protocol provides a rapid and low cost procedure for the synthesis of both copper and copper(II) oxide nanoparticles in the same microemulsion pool. The nanoparticles so formed have been successfully used for catalyzing various chemical reactions.

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Section: Discussionmentioning

confidence: 99%

Facile synthesis of size-tunable copper and copper oxide nanoparticles using reverse microemulsions

et al. 2013

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“…Our laboratory has previously used nanoparticles to catalyze a variety of reactions and synthesize many bioactive molecules 17–25. It is thus conceivable that our synthetic polymers could potentially be useful for a variety of biomedical applications.…”

Section: Discussionmentioning

confidence: 99%

Thermal properties and combustion behavior of POSS‐ and bohemite‐finished cotton fabrics

Alongi

Brancatelli²,

Rosace

2011

J of Applied Polymer Sci

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A finishing process with polyhedral oligomeric silsesquioxane (POSS) and bohemite nanoparticles has been exploited for enhancing the thermal stability and flame retardancy of cotton fabrics. The thermal behavior of flame retardant treated cellulosic fabric has been studied by thermogravimetric analyses (TGAs). It has been found that such nanoparticles favor the carbonization of the cellulose and slow down the kinetics of thermo-oxidation in air. At the same time, the finished fabrics have turned out to be more efficient with respect to neat cotton as far as the flame retardancy is concerned, pointing out an increase of the time to ignition (TTI) and a decrease of the heat release rate (HRR). Furthermore, a comparison between the fire performances of the nanoparticles under study and a commercial phosphorus-based flame retardant has been investigated. The morphology and elemental composition present in the treated fabrics have been also investigated using scanning electron microscopy (SEM) coupled to the energy dispersive spectroscopy (EDS), and the results have been compared with the untreated fabric.

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“…Our group has reported the use of nanoparticles in biomedical applications 37,38 and catalysis [39][40][41][42][43][44][45][46][47][48][49][50][51][52] in the past. Here we have demonstrated the use of gold nanoparticles for immobilization of urease, a technique that could potentially be used to immobilize other relevant proteins and bioactive peptides.…”

Section: Resultsmentioning

confidence: 99%

pH‐dependent immobilization of urease on glutathione‐capped gold nanoparticles

Garg

Mozumdar

2014

J Biomedical Materials Res

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Urease is a nickel-dependent metalloenzyme that catalyzes the hydrolysis of urea to form ammonia and carbon dioxide. Although the enzyme serves a significant role in several detoxification and analytical processes, its usability is restricted due to high cost, availability in small amounts, instability, and a limited possibility of economic recovery from a reaction mixture. Hence, there is a need to develop an efficient, simple, and reliable immobilization strategy for the enzyme. In this study, the carboxyl terminated surface of glutathione-capped gold nanoparticles have been utilized as a solid support for the covalent attachment of urease. The immobilization has been carried out at different pH conditions so as to elucidate its effect on the immobilization efficiency and enzyme bioactivity. The binding of the enzyme has been quantitatively and qualitatively analyzed through techniques like ultraviolet-visible spectroscopy, intrinsic steady state fluorescence, and circular dichorism. The bioactivity of the immobilized enzyme was investigated with respect to the native enzyme under different thermal conditions. Recyclability and shelf life studies of the immobilized enzyme have also been carried out. Results reveal that the immobilization is most effective at pH of 7.4 followed by that in an acidic medium and is least in alkaline environment. The immobilized enzyme also exhibits enhance activity in comparison to the native form at physiological temperature. The immobilized urease (on gold glutathione nanoconjugates surface) can be effectively employed for biosensor fabrication, immunoassays and as an in vivo diagnostic tool in the future.

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Selective Protection of Carbonyl Compounds over Nano-sized Nickel Catalysts

Cited by 19 publications

References 27 publications

Facile synthesis of size-tunable copper and copper oxide nanoparticles using reverse microemulsions

Facile synthesis of size-tunable copper and copper oxide nanoparticles using reverse microemulsions

Thermal properties and combustion behavior of POSS‐ and bohemite‐finished cotton fabrics

pH‐dependent immobilization of urease on glutathione‐capped gold nanoparticles

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