Controlling aqueous silica nanoparticle synthesis in the 10–100 nm range

2015 ◽  
Vol 51 (98) ◽  
pp. 17420-17423 ◽  
Author(s):  
Delyan R. Hristov ◽  
Eugene Mahon ◽  
Kenneth A. Dawson
Keyword(s):  
Nanoparticle Synthesis ◽  
Silica Nanoparticle ◽  
Single Step ◽  
Generation Rate ◽  
Nm Range ◽  
Aqueous Silica

Controlling monomer generation rate in different ways, we broaden the range of sizes attainable for single step aqueous silica nanoparticle synthesis.

Microwave-accelerated Carbon-carbon and Carbon-heteroatom Bond Formation via Multi-component Reactions: A Brief Overview

2020 ◽  
Vol 7 (1) ◽  
pp. 23-39 ◽  
Author(s):  
Kantharaju Kamanna ◽  
Santosh Y. Khatavi
Keyword(s):  
Organic Synthesis ◽  
Bond Formation ◽  
Cycloaddition Reaction ◽  
Nanoparticle Synthesis ◽  
Single Step ◽  
Bioactive Molecules ◽  
One Pot ◽  
Bond Forming ◽  
Material Interest ◽  
Carbon Carbon Bond

Multi-Component Reactions (MCRs) have emerged as an excellent tool in organic chemistry for the synthesis of various bioactive molecules. Among these, one-pot MCRs are included, in which organic reactants react with domino in a single-step process. This has become an alternative platform for the organic chemists, because of their simple operation, less purification methods, no side product and faster reaction time. One of the important applications of the MCRs can be drawn in carbon- carbon (C-C) and carbon-heteroatom (C-X; X = N, O, S) bond formation, which is extensively used by the organic chemists to generate bioactive or useful material synthesis. Some of the key carbon- carbon bond forming reactions are Grignard, Wittig, Enolate alkylation, Aldol, Claisen condensation, Michael and more organic reactions. Alternatively, carbon-heteroatoms containing C-N, C-O, and C-S bond are also found more important and present in various heterocyclic compounds, which are of biological, pharmaceutical, and material interest. Thus, there is a clear scope for the discovery and development of cleaner reaction, faster reaction rate, atom economy and efficient one-pot synthesis for sustainable production of diverse and structurally complex organic molecules. Reactions that required hours to run completely in a conventional method can now be carried out within minutes. Thus, the application of microwave (MW) radiation in organic synthesis has become more promising considerable amount in resource-friendly and eco-friendly processes. The technique of microwaveassisted organic synthesis (MAOS) has successfully been employed in various material syntheses, such as transition metal-catalyzed cross-coupling, dipolar cycloaddition reaction, biomolecule synthesis, polymer formation, and the nanoparticle synthesis. The application of the microwave-technique in carbon-carbon and carbon-heteroatom bond formations via MCRs with major reported literature examples are discussed in this review.

Silica Nanoparticle Synthesis and Multi-Method Characterisation

2019 ◽  
Vol 947 ◽  
pp. 82-90
Author(s):  
Pirutchada Musigapong ◽  
Sophie Marie Briffa ◽  
Iseult Lynch ◽  
Siriwat Soontaranon ◽  
N. Chanlek ◽  
...  
Keyword(s):  
Particle Size ◽  
Sol Gel ◽  
Nanoparticle Synthesis ◽  
Size Control ◽  
Silica Nanoparticle ◽  
Radius Of Gyration ◽  
Hydrodynamic Diameter ◽  
X Ray Scattering ◽  
Transmission Electron ◽  
Diameter Core

The information provided by different characterisation methods when measuring particle size varies depending on the chosen technique and analytical approach (e.g. light scattering, transmission electron microscopy, spectroscopy, x-ray scattering). This in turn has an impact on the accuracy of the results as well as comparability between methods and overall confidence on the analyses. The present study used a common sol-gel reaction to synthesise amorphous silica nanoparticles (aSiNPs) and characterised the product purity and homogeneity. The reaction involved hydrolysis and condensation of tetraethyl orthosilicate (TEOS) in the presence of lysine, which acted as catalyst for the silica production and also as a capping agent for particle size control in a suspension kept at pH 8-10. According to DLS data, the stock suspension was stable for at least 6 months in Milli Q water without surfactant when kept at 4°C. This study focused on multi-method size and shape characterisation of the aSiNPs, involving the following techniques: DLS, TEM, FTIR, STEM and SAXS. These techniques provided information on hydrodynamic diameter, core particle dimensions, sphere equivalent size, and radius of gyration. Our results show two particle populations, one around 2 nm and the other around 7 nm in diameter. Notably, these two populations are not resolved (i.e. “visible”) by all methods used.

Bioinspired Approach to Silica Nanoparticle Synthesis Using Amine-Containing Block Copoly(vinyl ethers): Realizing Controlled Anisotropy

Langmuir ◽  
2019 ◽  
Vol 35 (33) ◽  
pp. 10846-10854
Author(s):  
Ayae Sugawara-Narutaki ◽  
Sachio Tsuboike ◽  
Yukari Oda ◽  
Atsushi Shimojima ◽  
Kira B. Landenberger ◽  
...  
Keyword(s):  
Nanoparticle Synthesis ◽  
Silica Nanoparticle ◽  
Vinyl Ethers

Chemistry of Aqueous Silica Nanoparticle Surfaces and the Mechanism of Selective Peptide Adsorption

2012 ◽  
Vol 134 (14) ◽  
pp. 6244-6256 ◽  
Author(s):  
Siddharth V. Patwardhan ◽  
Fateme S. Emami ◽  
Rajiv J. Berry ◽  
Sharon E. Jones ◽  
Rajesh. R. Naik ◽  
...  
Keyword(s):  
Silica Nanoparticle ◽  
Peptide Adsorption ◽  
Aqueous Silica

Inverse Nonionic Microemulsion Studied by Means of1H,13C, and PGSTE NMR during Silica Nanoparticle Synthesis

Langmuir ◽  
2009 ◽  
Vol 25 (5) ◽  
pp. 3224-3231 ◽  
Author(s):  
Fioretta Asaro ◽  
Alvise Benedetti ◽  
Nina Savko ◽  
Giorgio Pellizer
Keyword(s):  
Nanoparticle Synthesis ◽  
Silica Nanoparticle

Experimental evaluation of additional short ranged repulsion in structural oscillation forces

Soft Matter ◽  
2018 ◽  
Vol 14 (26) ◽  
pp. 5383-5392 ◽  
Author(s):  
Sebastian Schön ◽  
Regine von Klitzing
Keyword(s):  
Ionic Strength ◽  
Double Layer ◽  
Experimental Evaluation ◽  
Silica Nanoparticle ◽  
Nanoparticle Suspensions ◽  
Low Ionic Strength ◽  
Aqueous Silica

Identification of positive synergy at low ionic strength between structural oscillation and double layer forces in confined aqueous silica nanoparticle suspensions.

Heparin conjugated silica nanoparticle synthesis

2012 ◽  
Vol 32 (7) ◽  
pp. 2037-2041 ◽  
Author(s):  
Brigida Silvestri ◽  
Alessandro Pezzella ◽  
Giuseppina Luciani ◽  
Aniello Costantini ◽  
Fabiana Tescione ◽  
...  
Keyword(s):  
Nanoparticle Synthesis ◽  
Silica Nanoparticle

scholarly journals Fast nucleation for silica nanoparticle synthesis using a sol–gel method

Nanoscale ◽  
2016 ◽  
Vol 8 (47) ◽  
pp. 19662-19667 ◽  
Author(s):  
Chandra K. Dixit ◽  
Snehasis Bhakta ◽  
Ajeet Kumar ◽  
Steven L. Suib ◽  
James F. Rusling
Keyword(s):  
Sol Gel ◽  
Nanoparticle Synthesis ◽  
Silica Nanoparticle ◽  
Gel Method ◽  
Sol Gel Method
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