A tri-block copolymer templated synthesis of gold nanostructures

Falletta, Ester; Ridi, Francesca; Fratini, Emiliano; Vannucci, Chiara; Canton, Patrizia; Bianchi, Sabrina; Castelvetro, Valter; Baglioni, Piero

doi:10.1016/j.jcis.2010.12.074

Cited by 15 publications

(7 citation statements)

References 50 publications

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“…Polycarboxylic copolymers are known to effectively control CaCO 3 crystal growth [ 32 , 43 ] and stabilize CaCO 3 dispersions, even in organic solvents [ 44 ]. In a previous work, a triblock copolymer of acrylic acid (AA) and oligoethylene glycol methyl ether methacrylate (OEGMA) was found to be an effective stabilizer, even for gold nanoparticles [ 45 ]. In this work, four different copolymers based on the same structural elements (acrylic acid and oligoethylene glycol segments), but with different structure (random and block, copolymers) and topology (linear and comb-like) were tested as colloidal CCNPs stabilizers.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Water Suspensions of Nanocalcite for Cultural Heritage Applications

et al. 2018

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The consolidation of degraded carbonate stone used in ancient monuments is an important topic for European cultural heritage conservation. The products most frequently used as consolidants are based on tetraalkoxy- or alkylalkoxy-silanes (in particular tetraethyl-orthosilicate, TEOS), resulting in the formation of relatively stable amorphous silica or alkylated (hydrophobic) silica inside the stone pores. However, silica is not chemically compatible with carbonate stones; in this respect, nanocalcite may be a suitable alternative. The present work concerns the preparation of water suspensions of calcite nanoparticles (CCNPs) by controlled carbonation of slaked lime using a pilot-scale reactor. A simplified design of experiment was adopted for product optimization. Calcite nanoparticles of narrow size distribution averaging about 30 nm were successfully obtained, the concentration of the interfacial agent and the size of CaO being the most critical parameters. Primary nanoparticle aggregation causing flocculation could be substantially prevented by the addition of polymeric dispersants. Copolymer-based dispersants were produced in situ by controlled heterophase polymerisation mediated by an amphiphilic macro-RAFT (reversible addition-fragmentation transfer) agent. The stabilized CCNP aqueous dispersions were then applied on carbonate and silicate substrates; Scanning Electron Microscopy (SEM)analysis of cross-sections allowed the evaluation of pore penetration, interfacial binding, and bridging (gap-filling) properties of these novel consolidants.

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Section: Introductionmentioning

confidence: 99%

Preparation of Water Suspensions of Nanocalcite for Cultural Heritage Applications

et al. 2018

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“…Colloidal Au nanospheres were prepared in CTAB [12]. Therefore, diverse approaches have been developed to the reduction of Au(III) salts in water [13][14][15][16][17] using different ligands as colloidal particle stabilizers [18][19][20][21][22][23]. Until around 1980, gold was not fully recognized for its catalytic ability.…”

Section: Introductionmentioning

confidence: 99%

Studies on the Effect of the Capping Materials on the Spherical Gold Nanoparticles Catalytic Activity

Seoudi¹,

Said²

2011

WJNSE

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Size-controlled gold nanoparticles (AuNPs) were prepared in the presence of different capping materials (sodium citrate, cetyltrimethylammonium bromide (CTAB), and chitosan). The results obtained suggest that the AuNPs were synthesized with different particle size, which is controlled by changing the molar ratio between sodium citrate, (CTAB), and chitosan to Au (III). The catalytic activities of the AuNPs with different capping materials were studied for 4-nitrophenol reduction by NaBH4 as a model reaction. AuNPs with different capping materials is comparable from the value of the apparent rate constant of 4-nitrophenol reduction (0.6 × 10–3, 1.9 × 10–3, and 2.4 × 10–3 s–1) for sodium citrate, CTAB and chitosan. From the results, it is concluded that, AuNPs catalyzed the electron transfer process between and nitro compounds with all the capping materials used AuNPs capped by chitosan were more active for the reduction than the other two

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“…In the latest years, the sizes of Au NPs were also evaluated by mean of small angle X‐ray scattering technique (SAXS) . SAXS can be readily applied to particles in the range from 1 to 100 nm.…”

Section: Resultsmentioning

confidence: 99%

“…The discrepancy arising from the comparison of TEM and SAXS data can be attributed to the differences in the experimental conditions between the two techniques: SAXS curves were acquired from thicker films, whereas TEM grids were prepared by irradiating the formulations (F1÷F3+Au) on the copper grids, when the final films were very thin. It is important to note that the TEM approach is strongly influenced by the experimental procedure used to prepare the sample, the number of images analyzed, and the image analysis …”

Section: Resultsmentioning

confidence: 99%

Obtaining of hybrid nanocomposites by simultaneous photopolymerization of some urethane monomers and photoinduced formation of gold nanoparticles

Chibac¹,

Melinte²,

Buruiană³

et al. 2013

J. Polym. Sci. Part A: Polym. Chem.

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Urethane–urea dimethacrylates were synthesized and used in the preparation of nanocomposites containing gold nanoparticles (Au NPs) in situ photogenerated during the UV‐curing process in the absence of reducing agent. A study of the photopolymerization kinetics showed that the photoreactivity of the monomers alone or in combination with a dual urethane benzophenone (BP) macromer is dependent on the nature of photoinitiator (Irgacure819, BP/amine) and the formulation composition. It was found that the addition of 1 wt % AuBr3 in monomers slightly improved the polymerization rate and the degree of conversion. The formation of Au NPs into the network was confirmed through UV–vis, XRD, EDX, SAXS, and TEM analyses, the last indicating the existence of NPs with size around 8.5 nm and spherical/triangle shapes. On addition of 10 wt % 2[N‐methacryloyloxyethyl‐(N'‐2‐thioethyl)] (urea) in formulation, the Au NPs (200 nm) became predominantly cubic/hexagonal in shape. The composite films emit fluorescence at 575 nm, and this property could be exploited in the field of fluorescent bio/sensors. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 728–738

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A tri-block copolymer templated synthesis of gold nanostructures

Cited by 15 publications

References 50 publications

Preparation of Water Suspensions of Nanocalcite for Cultural Heritage Applications

Preparation of Water Suspensions of Nanocalcite for Cultural Heritage Applications

Studies on the Effect of the Capping Materials on the Spherical Gold Nanoparticles Catalytic Activity

Obtaining of hybrid nanocomposites by simultaneous photopolymerization of some urethane monomers and photoinduced formation of gold nanoparticles

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