Size-dependent molecule-like to plasmonic transition in water-soluble glutathione stabilized gold nanomolecules

Nanoscale ◽  
2014 ◽  
Vol 6 (2) ◽  
pp. 683-687 ◽  
Author(s):  
Nuwan Kothalawala ◽  
James Lee West IV ◽  
Amala Dass
Keyword(s):  
Water Soluble ◽  
Size Dependent

scholarly journals Synthesis and Size Dependent Reflectance Study of Water Soluble SnS Nanoparticles

Nanomaterials ◽  
2012 ◽  
Vol 2 (1) ◽  
pp. 54-64 ◽  
Author(s):  
Ying Xu ◽  
Najeh Al-Salim ◽  
Richard D. Tilley
Keyword(s):  
Water Soluble ◽  
Size Dependent

scholarly journals Size-dependent activation of aerosols into cloud droplets at a subarctic background site during the second Pallas Cloud Experiment (2nd PaCE): method development and data evaluation

2009 ◽  
Vol 9 (14) ◽  
pp. 4841-4854 ◽  
Author(s):  
T. Anttila ◽  
P. Vaattovaara ◽  
M. Komppula ◽  
A.-P. Hyvärinen ◽  
H. Lihavainen ◽  
...  
Keyword(s):  
Growth Factors ◽  
Water Uptake ◽  
Method Development ◽  
Water Soluble ◽  
Hygroscopic Growth ◽  
Mixing State ◽  
Cloud Droplets ◽  
Important Conclusion ◽  
Size Dependent ◽  
Background Site

Abstract. In situ measurements of aerosol water uptake and activation of aerosols into cloud droplets provide information on how aerosols influence the microphysical properties of clouds. Here we present a computational scheme that can be used in connection with such measurements to assess the influence of the particle hygroscopicity and mixing state (in terms of the water uptake) on the cloud nucleating ability of particles. Additionally, it provides an estimate for the peak supersaturation of water vapour reached during the formation of the observed cloud(s). The method was applied in interpreting results of a measurement campaign that focused on aerosol-cloud interactions taking place at a subarctic background site located in Northern Finland (second Pallas Cloud Experiment, 2nd PaCE). A set of case studies was conducted, and the observed activation behavior could be successfully explained by a maximum supersaturation that varied between 0.18 and 0.26% depending on the case. In these cases, the diameter corresponding to the activated fraction of 50% was in the range of 110–140 nm, and the particles were only moderately water soluble with hygroscopic growth factors varying between 1.1 and 1.4. The conducted analysis showed that the activated fractions and the total number of particles acting as CCN are expected to be highly sensitive to the particle hygroscopic growth properties. For example, the latter quantity varied over a factor between 1.8 and 3.1, depending on the case, when the mean hygroscopic growth factors were varied by 10%. Another important conclusion is that size-dependent activation profiles carries information on the mixing state of particles.

Mechanistic evaluation of the size dependent antimicrobial activity of water soluble QDs

2016 ◽  
Vol 8 (5) ◽  
pp. 1060-1068 ◽  
Author(s):  
Aakriti Tyagi ◽  
Kamla Rawat ◽  
Anita K. Verma ◽  
H. B. Bohidar
Keyword(s):  
Quantum Dots ◽  
Antimicrobial Activity ◽  
Water Soluble ◽  
Cdse Quantum Dots ◽  
Size Dependent ◽  
Size Variable

Water soluble size variable (2.43–5.09 nm) CdSe quantum dots.

Fabrication of Fluorescent Cellular Probes: Hybrid Dendrimer/Gold Nanoclusters

2007 ◽  
Vol 1007 ◽  
Author(s):  
Chang Zhong ◽  
Yuping Bao ◽  
Dung M. Vu ◽  
R. Brian Dyer ◽  
Jennifer S. Martinez
Keyword(s):  
Noble Metal ◽  
Gold Nanoclusters ◽  
Water Soluble ◽  
High Yield ◽  
Reaction Yield ◽  
Biological Applications ◽  
Metal Nanoclusters ◽  
Proof Of Concept ◽  
Size Dependent ◽  
Metal Atoms

ABSTRACTFluorescent metal nanoclusters, which consist of collections of small numbers of noble metal atoms, are of great interest in photochemistry and photophysics due to their strong size-dependent emission. Historically their generation was confined to gaseous and solid phases; however, recently a unique organic/inorganic hybrid materials approach was developed that utilizes dendrimers as templates to protect nanoclusters from solution based fluorescence quenching. These hybrid dendrimer/gold nanoclusters are water-soluble and highly fluorescent. Yet there are several intrinsic deficiencies in their synthetic method: first, NaBH4, a toxic chemical, was used as reducing agent in the reaction; and second, the reaction yield was low due to the concurrent formation of large, non-emissive, gold particles. Here we report a particle-free method to produce dendrimer-encapsulated gold nanoclusters in high-yield. Proof of concept is demonstrated using OH-terminated poly(amidoamine) dendrimer and Au(PX3)3Cl (X = Ph, Me), but the approach can also be extended to the combination of other dendrimers and organic noble metal salts. Our approach yields fluorescent clusters with homogeneous size distribution. These clusters can be transferred to aqueous solution and used directly for biological applications.

scholarly journals Size-Dependent Photodynamic Activity of Gold Nanoparticles Conjugate of Water Soluble Purpurin-18-N-Methyl-D-Glucamine

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Byambajav Lkhagvadulam ◽  
Jung Hwa Kim ◽  
Il Yoon ◽  
Young Key Shim
Keyword(s):  
Gold Nanoparticles ◽  
A549 Cells ◽  
Water Soluble ◽  
Molar Ratio ◽  
Anticancer Efficacy ◽  
Molar Ratios ◽  
Size Dependent ◽  
Photodynamic Activity ◽  
Wavelength Absorption

Gold nanoparticles (GNPs) conjugates of water soluble ionic photosensitizer (PS), purpurin-18-N-methyl-D-glucamine (Pu-18-NMGA), were synthesized using various molar ratios between HAuCl4and Pu-18-NMGA without adding any particular reducing agents and surfactants. The PS-GNPs conjugates showed long wavelength absorption of range 702–762 nm, and their different shapes and diameters depend on the molar ratios used in the synthesis.In vitroanticancer efficacy of the PS-GNPs conjugates was investigated by MTT assay against A549 cells, resulting in higher photodynamic activity than that of the free Pu-18-NMGA. Among the PS-GNPs conjugates, the GNPs conjugate from the molar ratio of 1 : 2 (Au(III): Pu-18-NMGA) exhibits the highest photodynamic activity corresponding to bigger size (~60 nm) of the GNPs conjugate which could efficiently transport the PS into the cells than that of smaller size of the GNPs conjugate.

Chitosan encapsulated water-soluble silver bionanocomposite for size-dependent antibacterial activity

2019 ◽  
Vol 20 ◽  
pp. 100393 ◽  
Author(s):  
Tanmoy Dutta ◽  
Narendra Nath Ghosh ◽  
Asoke P. Chattopadhyay ◽  
Mahuya Das
Keyword(s):  
Antibacterial Activity ◽  
Water Soluble ◽  
Size Dependent

scholarly journals Charge-specific size-dependent separation of water-soluble organic molecules by fluorinated nanoporous networks

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Jeehye Byun ◽  
Hasmukh A. Patel ◽  
Damien Thirion ◽  
Cafer T. Yavuz
Keyword(s):  
Organic Molecules ◽  
Water Soluble ◽  
Size Dependent

Fabrication of Water-Soluble CuInS2 Quantum Dots by Hot-Injection Method and Phase Transfer Strategy

NANO ◽  
2018 ◽  
Vol 13 (10) ◽  
pp. 1850114 ◽  
Author(s):  
Chong Deng ◽  
Bowen Fu ◽  
Yanlai Wang ◽  
Lin Yang
Keyword(s):  
Quantum Confinement ◽  
Crystal Size ◽  
Phase Transfer ◽  
Quantum Confinement Effect ◽  
Water Soluble ◽  
Injection Method ◽  
Size Dependent ◽  
Structure And Morphology ◽  
Hot Injection ◽  
Cuins2 Quantum Dots

Here we report an optimized hot-injection method and a phase transfer strategy for the synthesis of water-soluble CuInS2 QDs with desired properties. The structure and morphology studies demonstrate that the resulting QDs are CuInS2 tetragonal phase with well-defined facets. It is also found that the crystal size gradually increases with the increase of reaction temperature, while the surface of QDs with pre- and post-phase transfer is functionalized with hydrophobic and hydrophilic ligands, respectively. Spectroscopy measurements reveal the size-dependent optical properties of CuInS2 QDs, demonstrating the quantum confinement effect in this system.

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