An aggregative growth process for controlling size, shape and composition of metal, alloy and core–shell nanoparticles toward desired bioapplications

Cheng, Huhu; Luo, Jin; Zhong, Chuan‐Jian

doi:10.1039/c4tb00962b

Cited by 13 publications

(15 citation statements)

References 89 publications

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“…The antibacterial action of Ag+ ions has been broadly reported so far [101], also AgNPs repeatedly showed their potency against bacteria [102]. Thus, our results (growth inhibition of both bacterial strains by AgNP [4][5][6] ) are in agreement with other groups results. Biocidal properties of AuNPs of similar size (5 nm) as prepared by our group (4-6 nm), were observed by Lima et al [103].…”

Section: E Coli S Epidermidissupporting

confidence: 92%

“…Colloidal nanoparticles are studied because they have unique physical and chemical properties that are different from "bulk" materials [4]. In all applications of nanotechnology, the size and shape of the nanoparticles play an important role [5]. Numerous studies [6] describe the unique properties of gold nanoparticles which can be used in applications such as fuel cells, environmental, and other chemical processes [7].…”

Section: Introductionmentioning

confidence: 99%

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Noble Metal Nanoparticles Prepared by Metal Sputtering into Glycerol and their Grafting to Polymer Surface

Siegel¹,

Řezníčková²,

Slepička³

et al. 2015

Nanoparticles Technology

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This chapter summarizes the basic information about elementary characteristics and technology of preparation of noble metal nanoparticles. The introduction gives some basic information on the history of development in this area, especially in terms of dimensionality of metal nanostructures and their possible applications.The first subsection is devoted to the preparation and characterization of "u, "g, Pt, and Pd nanoparticles NPs , which were synthesized by direct metal sputtering in liquid propane-, , ,-triole glycerol . This method provides an interesting alternative to time-consuming, wetbased chemical synthesis techniques. Moreover, the suggested technique allows targeted variation of metal nanoparticle size, which is demonstrated in detail in case of "uNPs by variation of capturing media temperature. Nanoparticle size and shape were studied by transmission electron microscopy and dynamic light scattering. Optical properties of nanoparticle solution were determined by measuring its UV-Vis spectra. Concentration of metal nanoparticles in prepared solutions was determined by atomic absorption spectroscopy. "ntibacterial properties were tested against two common pollutants Escherichia coli, a Gram-negative bacteria, and Staphylococcus epidermidis, a Gram-positive bacteria . In the presence of "g nanoparticles, the growth of E. coli and S. epidermidis was completely inhibited after h. "ny growth inhibition of E. coli was observed neither in the presence of smaller -nm, "uNP -nor bigger -nm, "uNP -"uNPs during the whole examination period. "uNP -, but not "uNP -, was able to inhibit the growth of. S epidermidis. We also observed significant difference in biological activities of Pt and PdNPs. More specifically, PdNPs exhibited considerable inhibitory potential against both E. coli and S. epidermidis, which was in contrast to ineffective PtNPs. Our results indicate that "g, Pd, and partially "uNPs have high potential to combat both Gram-positive and Gram-negative bacterial strains.The second subsection describes the effort to anchor metal nanoparticles onto polyethyleneterephthalate PET carrier. Two different procedures of grafting of polymeric carrier, activated by plasma treatment, with "u and "gNPs are described. In the first procedure, the PET foil was grafted with biphenyl-, -dithiol "PD and subsequently with "u and "gNPs. In the second one, the PET foil was grafted with "u and "gNPs previously coated by the same "PD. X-ray photoelectron spectrosco-© 2015 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.py, Fourier transform infrared spectroscopy, and electrokinetic analysis were used for characterization of the polymer surface at different modification steps. "u and "gNPs were characterized by UV-Vis spectroscopy. In case of both types of nanoparticles, the first ...

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Section: E Coli S Epidermidissupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Noble Metal Nanoparticles Prepared by Metal Sputtering into Glycerol and their Grafting to Polymer Surface

Siegel¹,

Řezníčková²,

Slepička³

et al. 2015

Nanoparticles Technology

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show abstract

“…The observed irregularity in particle shapes can be attributed to dynamic coalescence of several smaller nanoparticles. [78][79] Fast Fourier Transform (FFT) of the TEM image (Figure 3b Magnetism studies. Vibrating sample magnetometry (VSM) was used to measure the magnetic properties of the bulk heated samples (Figure S23 and Table S3).…”

Section: Thermolysis Of Ppes N [Co 2 (Co) 6 ] X -B-peo 800 -B-ppes N [Co 2 (Co) 6 ]mentioning

confidence: 99%

Magnetic Hydrogels from Alkyne/Cobalt Carbonyl-Functionalized ABA Triblock Copolymers

et al. 2016

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A series of alkyne-functionalized poly(4-(phenylethynyl)styrene)-block-poly(ethylene oxide)-block-poly(4-(phenylethynyl)styrene) (PPES-b-PEO-b-PPES) ABA triblock copolymers was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. PESn[Co2(CO)6]x-EO800-PESn[Co2(CO)6]x ABA triblock copolymer/cobalt adducts (10-67 wt % PEO) were subsequently prepared by reaction of the alkyne-functionalized PPES block with Co2(CO)8 and their phase behavior was studied by TEM. Heating triblock copolymer/cobalt carbonyl adducts at 120 °C led to cross-linking of the PPES/Co domains and the formation of magnetic cobalt nanoparticles within the PPES/Co domains. Magnetic hydrogels could be prepared by swelling the PEO domains of the cross-linked materials with water. Swelling tests, rheological studies and actuation tests demonstrated that the water capacity and modulus of the hydrogels were dependent upon the composition of the block copolymer precursors.

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“…The ability to control size is essential for the exploration of electronic, optical, and magnetic properties of nanomaterials at the nanoscale, which has considerable technological applications in areas such as microelectronics, optical devices, magnetic materials, catalysis, sensors, and drug delivery . One important class of nanomaterials is thiolate‐capped gold nanoparticles synthesized by a two‐phase synthetic protocol .…”

Section: Introductionmentioning

confidence: 99%

“…In the size growth process, time and temperature have also been shown as important factors in controlling the size when a polydisperse gold nanoparticle system was heated in 4‐ tert ‐butyltoluene with hexadecanethiol at different temperatures. The understanding of these factors is important for exploring electronic properties of 1D, 2D, and 3D assemblies of chemically modified metal nanoparticles for chemical sensing and biosensing applications …”

Section: Introductionmentioning

confidence: 99%

Assessing the Role of Capping Molecules in Controlling Aggregative Growth of Gold Nanoparticles in Heated Solution

Cheng

Schadt

Zhong

2015

Chemistry An Asian Journal

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This report describes findings of an investigation of the role of capping molecules in the size growth in the aggregative growth of pre-formed small-sized gold nanoparticles capped with alkanethiolate monolayers toward monodispersed larger sizes. The size controllability depends on the thiolate chain length and concentration in the thermal solution. The size evolution in solution at different concentrations of alkanethiols is analyzed in relation to adsorption isotherms and cohesive energy. The size dependence on thiolate chain length is also analyzed by considering the cohesive energy of the capping molecules, revealing the importance of cohesive energy in the capping structure. Theoretical and experimental comparisons of the surface plasmonic resonance optical properties have also provided new insights into the mechanism, thus enabling the exploitation of size-dependent nanoscale properties.

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An aggregative growth process for controlling size, shape and composition of metal, alloy and core–shell nanoparticles toward desired bioapplications

Cited by 13 publications

References 89 publications

Noble Metal Nanoparticles Prepared by Metal Sputtering into Glycerol and their Grafting to Polymer Surface

Noble Metal Nanoparticles Prepared by Metal Sputtering into Glycerol and their Grafting to Polymer Surface

Magnetic Hydrogels from Alkyne/Cobalt Carbonyl-Functionalized ABA Triblock Copolymers

Assessing the Role of Capping Molecules in Controlling Aggregative Growth of Gold Nanoparticles in Heated Solution

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