Gold nanoparticles preparation

Aryal, S., Bahadour, K.C.R., Bhattarai, J.R., Prabu, P. and Kim, H.Y. (2006) Immobilization of collagen on gold nanoparticles, preparation, characterization and hydroxyapatite growth, foumal of Materials Chemistry, 16, 4642-4648. 

Glogowski E, Tangirala R, He JB, Russell TP, Emrick T. Miciocapsules of PEGylated gold nanoparticles prepared by fluid-fluid interfacial assembly. Nano Lett 2007 7 389-393. 

Gautier C, Biirgi T (2006) Chiral N-isobutyryl-cysteine protected gold nanoparticles preparation, size selection, and optical activity in the UV-vis and infrared. J Am Chem Soc 128 11079-11087... 

Figure 6. SEM image of glassy carbon electrode surface modified with gold nanoparticles prepared with the seed-mediated growth approach. Reproduced from [32], copyright 2007, with permission from the Japan Society for Analytical Chemistry.

Fig. 5 Hydrogel-coated gold nanoparticles prepared by surfactant-free emulsion polymerization. After coating oleic acids on the gold nanoparticle, polymerization was carried out in the presence of A-isopropylacrylamide, acrylic acid, and ammonium persulfate (initiator). The size of resulting nanoparticles was in the range of 100-230 nm. (Modified from Ref l)...

In a recent study, we have investigated the reactivity of gold nanoparticles prepared by UHV-deposition on in situ cleaved MgO surfaces [83,84]. Particles grown at 200° C or higher were in epitaxy on the MgO surface and presented truncated octahedron shapes, which is the equilibrium shape [85]. The profile of such a particle observed by HRTEM is presented in Fig. 3.18. The aspect ratio is 0.6. 

Gold nanoparticles prepared within mesoporous silica monolith showed red-shift of the Mie-resonance absorption band with decreasing the Au particle size. Comparison with theoretical calculations of Mie-resonance for particles of... 

U. Lange, S. Ivanov, V. Lyutov, V. Tsakova, and V. Mirsky, Voltammetric and conductometric behaviour of nanocomposites of polyaniline and gold nanoparticles prepared by layer-by-layer technique, J. Solid State Electrochem., doi 10.1007/sl0008-009-0922-2 (2009). 

A.Z. Ernst, S. Zoladek, K. Wiaderek, J.A. Cox, A. Kolaryzurowska, K. Miecznikowski, and P.T. Kulesza, Network films of conducting polymer-linked polyoxometalate-modified gold nanoparticles preparation and electrochemical characterization, Elctrochim. Acta, 53, 3924-3931 (2008). 

Figure 17.5 Flow rate effect of the mean size of gold nanoparticles prepared in a microflow-through reduction of tetrachloroauric acid with ascorbic acid (measurement of size by centrifugal sedimentation spectroscopy).

Figure 4.17c shows a typical topography image of dimeric and isolated gold nanoparticles prepared on a cover slip. From the SEM observation of the sample, particles in the aggregate do not directly contact each other but are separated by a few nanometer to 10 nm. A two-photon excitation image of the sample is shown in Fig.4.17d. The image obtained sensitively reflects the optical field distribution of the sample. The optical field of the sample was greatly enhanced at the dimers (and at the trimer) in comparison with the isolated nanoparticles. Among four dimers in the sample, two dimers whose axes were parallel to the polarization of the incident light exhibited huge enhancements at the interstitial sites of the dimers. The other two dimers, whose axes are perpendicular to the incident field, showed only little...

Fig. 6.5 Schematic illustration of alkylthiol-stabitized gold nanoparticles prepared by NaBH4-reduction of AuCl4-ions Two-phase process [29]...

FIGURE 2.4 Transmission electron microscopy image of gold nanoparticles prepared by a different method, showing various sizes and shapes. (Reprinted from Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy, 73, Philip, Honey mediated green synthesis of gold nanoparticles, 650-653. Copyright 2009, with permission from Elsevier.)... 

The investigation of nanoparticles aggregation ratio influence on planar polyelectrolyte assemblies and microcapsules properties was carried out in paper. Gold nanoparticles prepared by chemical precipitation of gold chloride tryhidrate and sodium sulphide had an average diameter about 8 nm and homogeneous chemical composition in the whole volume. 

The TEM images also describe the same experimental results (Figure 10.7). Gold nanoparticles prepared in the absence of stabilizing ligands aggregate into large ones with a diameter of 7.7 1.9 nm, while the... 

FIGURE 3.5 Linear-scale conductivity-temperature plot of thin films of 1-dodecanethi-olate-passivated gold nanoparticles prepared at different Au thiol ratios (Au C12, (X Y)) where the data for each individual cluster is normalized to its value at 20°C. (Snow, A. W., and H. Wohltjen, 1998, Chem Mater 10 947-950. Used with permission.)... 

Selvakannan, R, S. Mandal, S. Phadtare, A. Gole, R. Pasricha, S. D. Adyanthaya, and M. Sastry. 2004. Water-dispersible tryptophan-protected gold nanoparticles prepared by the spontaneous reduction of aqueous chloroaurate ions by the amino acid. J. Colloid Lnterface Sci. 269 (1) 97-102. 

Tsuda, T., Seino, S. Kuwabata, S. (2009a). Gold nanoparticles prepared with a room-temperature ionic liquid-irradiation method, Chem. Commun. 6792-6794. 

Wender, H., Oliveira, L. F. de, Migowski, R, Feil, A. R, Lissner, E., Prechtl, M. H. G., Teixeira, S. R. Dupont, J. (2010). Ionic Liquid Surface Composition Controls the Size of Gold Nanoparticles Prepared by Sputtering Deposition,. Phys. Chem. C114 11764-11768. 

The new system was capable of measuring small permeation rates of as low as 1x10 cmVs. This level of accuracy is enough for most low permeable membranes. Gold nanoparticles prepared by wet-chemical process can be used to alter the polymer chain at percolation threshold by interacting with the penetrant molecules to change the diffusion and sorption kinetics. At percolation threshold the Au NPs in PDMS showed a reverse selective phenomenon for CO2. Further work is in progress to conclude the peculiar phenomena of these preliminary results. 

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