Polymer and biopolymer mediated self-assembly of gold nanoparticles

Ofir, Yuval; Samanta, Bappaditya; Rotello, Vincent M.

doi:10.1039/b712689c

Cited by 347 publications

(241 citation statements)

References 67 publications

(66 reference statements)

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“…5). The source of Cl − ions is the initial form AuCl 4 − , while the source of Na + is AOT during the isolation of AuNPs. Judging from broadening of diffraction peaks, the gold phase is ultrafine.…”

Section: Resultsmentioning

confidence: 99%

“…Gold nanoparticles (AuNPs) are very important for advanced materials and nanotechnology first of all due to their electron, optical, and catalytic properties [1][2][3][4][5]. Among a number of the methods of their preparation, rather widespread one is chemical reduction of gold species in solutions including homogeneous [6,7], heterogeneous [8][9][10], and colloidal [11,12] systems.…”

Section: Introductionmentioning

confidence: 99%

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Di-(2-ethylhexyl) dithiophosphoric acid surface protected gold nanoparticles: micellar synthesis, stabilization, isolation, and properties

et al. 2011

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Gold nanoparticles (AuNPs) were synthesized in the organic solution by means of the reduction of HAuCl 4 by hydrazine in reverse micelles of oxyethylated surfactant Triton N-42, with decane as the dispersion medium. To isolate the powder of particles, the micelles were destroyed with chloroform in the presence of di-(2-ethylhexyl) dithiophosphoric acid as a surface protecting agent. According to the results of several experiments, the yield is within the limits of 90-98%, calculated for gold. The obtained preparations are dark blue hydrophobic powders containing aggregated but not agglomerated gold nanoparticles, as well as microcrystals (∼0.08-0.2 μm) of NaCl. The powders get re-dispersed in weakly polar organic solvents with the formation of colloidal solutions. The shape of the nanoparticles is spherical. Their nuclei are gold single crystals with a narrow size distribution; their diameter (d Au ) is about two times as large as the diameter of the aqueous nucleus (d c ) of initial micelles: d Au =7.7±

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Di-(2-ethylhexyl) dithiophosphoric acid surface protected gold nanoparticles: micellar synthesis, stabilization, isolation, and properties

et al. 2011

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“…In the self-assembly of nanoparticles, surface properties determining the interactions between particles play a fundamental role (Niemeyer 2001;Shenhar et al 2005;Srinivasan et al 2006;Ofir et al 2008;Talapin 2008;Lim & Zhong 2009). Finally, owing to the extremely high surface-to-volume ratio of nanoparticles, they may be ideally suited for catalytic purposes, as recently summarized in a review (Narayanan & El-Sayed 2008).…”

Section: Applications Outlookmentioning

confidence: 99%

Surface modification, functionalization and bioconjugation of colloidal inorganic nanoparticles

Sperling

Parak

2010

Phil. Trans. R. Soc. A.

1,396

1,092

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Inorganic colloidal nanoparticles are very small, nanoscale objects with inorganic cores that are dispersed in a solvent. Depending on the material they consist of, nanoparticles can possess a number of different properties such as high electron density and strong optical absorption (e.g. metal particles, in particular Au), photoluminescence in the form of fluorescence (semiconductor quantum dots, e.g. CdSe or CdTe) or phosphorescence (doped oxide materials, e.g. Y 2 O 3 ), or magnetic moment (e.g. iron oxide or cobalt nanoparticles). Prerequisite for every possible application is the proper surface functionalization of such nanoparticles, which determines their interaction with the environment. These interactions ultimately affect the colloidal stability of the particles, and may yield to a controlled assembly or to the delivery of nanoparticles to a target, e.g. by appropriate functional molecules on the particle surface. This work aims to review different strategies of surface modification and functionalization of inorganic colloidal nanoparticles with a special focus on the material systems gold and semiconductor nanoparticles, such as CdSe/ZnS. However, the discussed strategies are often of general nature and apply in the same way to nanoparticles of other materials.

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“…However, uniformly dispersing colloids in polymer matrices, and vice versa, has represented a challenge that requires careful tuning of the interactions and the processing conditions [5][6][7] . Nature, on the other hand, can assemble to perfection complex composite materials for a variety of functions.…”

mentioning

confidence: 99%

Blood-clotting-inspired reversible polymer–colloid composite assembly in flow

et al. 2013

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Blood clotting is a process by which a haemostatic plug is assembled at the site of injury. The formation of such a plug, which is essentially a (bio)polymer-colloid composite, is believed to be driven by shear flow in its initial phase, and contrary to our intuition, its assembly is enhanced under stronger flowing conditions. Here, inspired by blood clotting, we show that polymer-colloid composite assembly in shear flow is a universal process that can be tailored to obtain different types of aggregates including loose and dense aggregates, as well as hydrodynamically induced 'log'-type aggregates. The process is highly controllable and reversible, depending mostly on the shear rate and the strength of the polymer-colloid binding potential. Our results have important implications for the assembly of polymercolloid composites, an important challenge of immense technological relevance. Furthermore, flow-driven reversible composite formation represents a new paradigm in non-equilibrium self-assembly.

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Polymer and biopolymer mediated self-assembly of gold nanoparticles

Cited by 347 publications

References 67 publications

Di-(2-ethylhexyl) dithiophosphoric acid surface protected gold nanoparticles: micellar synthesis, stabilization, isolation, and properties

Di-(2-ethylhexyl) dithiophosphoric acid surface protected gold nanoparticles: micellar synthesis, stabilization, isolation, and properties

Surface modification, functionalization and bioconjugation of colloidal inorganic nanoparticles

Blood-clotting-inspired reversible polymer–colloid composite assembly in flow

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