Facile immobilization of gold nanoparticles into electrospun polyethyleneimine/polyvinyl alcohol nanofibers for catalytic applications

Fang, Xinsheng; Ma, Hui; Xiao, Shili; Shen, Mingwu; Guo, Rui; Cao, Xueyan; Shi, Xiangyang

doi:10.1039/c0jm03987j

Cited by 183 publications

(158 citation statements)

References 54 publications

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“…It is worth noting that M′ si and M′ n−HA in the equation stands for the incoming molecular mass of APTS and nanohydroxyapatite after APTS modification reaction to form n-HA-APTS, 43 where the value of M′ si and M′ n−HA is calculated to be 134 and 953, respectively. The mass of APTS reacted with nanohydroxyapatite was estimated to be 6.96% according to Equation 1.…”

Section: Resultsmentioning

confidence: 99%

“…The surface amines of the n-HA-APTS particles were then acylated with acetic anhydride and succinic anhydride to form neutrally and negatively charged particles, respectively. The differently modified particles formed were extensively characterized using FTIR, 1 H NMR, ICP-AES, TEM, X-ray diffraction, and zeta potential measurement.…”

Section: Resultsmentioning

confidence: 99%

“…The functionalized nanohydroxyapatite derivatives were extensively characterized using Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), 1 H nuclear magnetic resonance (NMR), X-ray diffraction, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and zeta potential measurement. The cytotoxicity of these functionalized nanohydroxyapatite derivatives was tested by an MTT (3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide) colorimetric assay of mouse fibroblasts (L929 cells).…”

Section: Introductionmentioning

confidence: 99%

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Aminopropyltriethoxysilane-mediated surface functionalization of hydroxyapatite nanoparticles: synthesis, characterization, and in vitro toxicity assay

Wang¹,

Wen²,

Shen³

et al. 2011

IJN

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Background We report on aminopropyltriethoxysilane (APTS)-mediated surface modification of nanohydroxyapatite with different surface functional groups for potential biomedical applications. In this study, nanohydroxyapatite covalently linked with APTS (n-HA-APTS) was reacted with acetic anhydride or succinic anhydride to produce neutralized (n-HA-APTS. Ac) or negatively charged (n-HA-APTS.SAH) nanohydroxyapatite, respectively. Nanohydroxyapatite formed with amine, acetyl, and carboxyl groups was extensively characterized using Fourier transform infrared spectroscopy, transmission electron microscopy, 1 H nuclear magnetic resonance spectroscopy, X-ray diffraction, inductively coupled plasma-atomic emission spectroscopy, and zeta potential measurements. Results In vitro 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide colorimetric assay revealed that the slight toxicity of the amine-functionalized n-HA-APTS could be eliminated by post-functionalization of APTS amines to form acetyl and carboxyl groups. Blood compatibility assessment demonstrated that the negligible hemolytic activity of the pristine nanohydroxyapatite particles did not appreciably change after APTS-mediated surface functionalization. Conclusion APTS-mediated functionalization of nanohydroxyapatite with different surface groups may be useful for further functionalization of nanohydroxyapatite with biologically active materials, thereby providing possibilities for a broad range of biomedical applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aminopropyltriethoxysilane-mediated surface functionalization of hydroxyapatite nanoparticles: synthesis, characterization, and in vitro toxicity assay

Wang¹,

Wen²,

Shen³

et al. 2011

IJN

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“…Moreover, the catalytic reactivity of the bimetallic particles can be influenced by their structure, the atoms of the nanoparticles can be organised as solid solutions or core-shell structures [51,[53][54][55]. Furthermore, the studies are also focused on the development of synthesis methodologies for the size of the gold nanoparticles deposited on catalytic supports or stabilized in solution [56][57][58][59]. The functionalisation of the nanoparticles in solution are mainly used for solid-liquid heterogeneous catalysis [60][61][62].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

et al. 2017

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Abstract:Since the early discovery of the catalytic activity of gold at low temperature, there has been a growing interest in Au and Au-based catalysis for a new class of applications. The complexity of the catalysts currently used ranges from single crystal to 3D structured materials. To improve the efficiency of such catalysts, a better understanding of the catalytic process is required, from both the kinetic and material viewpoints. The understanding of such processes can be achieved using environmental imaging techniques allowing the observation of catalytic processes under reaction conditions, so as to study the systems in conditions as close as possible to industrial conditions. This review focuses on the description of catalytic processes occurring on Au-based catalysts with selected in situ imaging techniques, i.e., PEEM/LEEM, FIM/FEM and E-TEM, allowing a wide range of pressure and material complexity to be covered. These techniques, among others, are applied to unravel the presence of spatiotemporal behaviours, study mass transport and phase separation, determine activation energies of elementary steps, observe the morphological changes of supported nanoparticles, and finally correlate the surface composition with the catalytic reactivity.

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“…[5] In order to solve this problem, NMNPs are usually immobilized onto various supporting materials such as mesoporous silicas, [6] metal oxides, [7,8] and electrospun fibers. [9,10] Despite all the development in heterogeneous catalyst preparation, there is still great attention in developing catalytic supports from stable and inert membranes composed of ceramic fibers. [11] Ceramic membranes supply a strong platform for the incorporation of NMNPs investigated for different catalytic applications.…”

Section: Introductionmentioning

confidence: 99%

Retraction: Gold Nanoparticles Immobilized on Electrospun Titanium Dioxide Nanofibers for Catalytic Reduction of 4‐Nitrophenol

Çavuşoğlu¹,

Buyukbekar²,

Şakalak³

et al. 2017

ChemPhysChem

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This study involves the preparation and catalytic properties of anatase titanium dioxide nanofibers (TiO2 NFs) supported gold nanoparticles (Au NPs) using a model reaction based on the reduction of 4-nitrophenol (NP) into 4-aminophenol (AP) by sodium borohydride (NaBH4). The fabrication of surfactant-free Au NPs was performed using pulsed laser ablation in liquid (PLAL) technique. The TiO2 NFs were fabricated by a combination of electrospinning and calcination process using a solution containing poly(vinyl pyrolidone)(PVP) and titanium isopropoxide. The adsorption efficiency of laser-generated surfactant-free Au NPs to TiO2 NF supports as a function of pH was analyzed. Our results show that the electrostatic interaction mainly controls the adsorption of the nanoparticles. Au NPs/TiO2 NFs composite exhibited good catalytic activity for the reduction of 4-NP to 4-AP. The unique combination of these materials leads to the development of highly efficient catalysts. Our heterostructured nanocatalysts possibly form an efficient path to fabricate various metal NP/metal-oxide supported catalysts. Thus the applications of PLALnoble metal NPs can widely broaden.

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Facile immobilization of gold nanoparticles into electrospun polyethyleneimine/polyvinyl alcohol nanofibers for catalytic applications

Cited by 183 publications

References 54 publications

Aminopropyltriethoxysilane-mediated surface functionalization of hydroxyapatite nanoparticles: synthesis, characterization, and in vitro toxicity assay

Aminopropyltriethoxysilane-mediated surface functionalization of hydroxyapatite nanoparticles: synthesis, characterization, and in vitro toxicity assay

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

Retraction: Gold Nanoparticles Immobilized on Electrospun Titanium Dioxide Nanofibers for Catalytic Reduction of 4‐Nitrophenol

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