A novel method for preparing silver nanoparticle–hydrogel nanocomposites via pH-induced self-assembly

2012 ◽  
Vol 48 (41) ◽  
pp. 5001 ◽  
Author(s):  
Ju Young Yook ◽  
Gwang-Ho Choi ◽  
Dong Hack Suh
Keyword(s):  
Silver Nanoparticle ◽  
Self Assembly ◽  
Novel Method ◽  
Hydrogel Nanocomposites

Flow Chemistry Controls Both Self-Assembly and the Entrapped Oscillatory Cargo in Belousov-Zhabotinsky Driven Polymerization-Induced Self-Assembly

2019 ◽  
Author(s):  
Liman Hou ◽  
Marta Dueñas-Diez ◽  
Rohit Srivastava ◽  
Juan Perez-Mercader
Keyword(s):  
Self Assembly ◽  
Flow Chemistry ◽  
Batch Reactors ◽  
Equilibrium Conditions ◽  
One Pot ◽  
Bz Reaction ◽  
Polymer Vesicles ◽  
Simultaneous Control ◽  
Novel Method ◽  
Continuously Stirred Tank Reactor

<p></p><p>Belousov-Zhabotinsky (B-Z) reaction driven polymerization-induced self-assembly (PISA), or B-Z PISA, is a novel method for the autonomous one-pot synthesis of polymer vesicles from a macroCTA (macro chain transfer agent) and monomer solution (“soup”) containing the above and the BZ reaction components. In it, the polymerization is driven (and controlled) by periodically generated radicals generated in the oscillations of the B-Z reaction. These are inhibitor/activator radicals for the polymerization. Until now B-Z PISA has only been carried out in batch reactors. In this manuscript we present the results of running the system using a continuously stirred tank reactor (CSTR) configuration which offers some interesting advantages.Indeed, by controlling the CSTR parameters we achieve reproducible and simultaneous control of the PISA process and of the properties of the oscillatory cargo encapsulated in the resulting vesicles. Furthermore, the use of flow chemistry enables a more precise morphology control and chemical cargo tuning. Finally, in the context of biomimetic applications a CSTR operation mimics more closely the open non-equilibrium conditions of living systems and their surrounding environments.</p><p></p>

Layer-by-layer self-assembly of polydopamine/gold nanoparticle/thiol coating as the stationary phase for open tubular capillary electrochromatography

2015 ◽  
Vol 7 (19) ◽  
pp. 8227-8234 ◽  
Author(s):  
Xiu-Ju Li ◽  
Qi-Feng Fu ◽  
Qi-Hui Zhang ◽  
Xue-Mei Jiang ◽  
Feng-Qing Yang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Stationary Phase ◽  
Gold Nanoparticle ◽  
Self Assembly ◽  
Capillary Electrochromatography ◽  
Phase Ratio ◽  
Layer By Layer ◽  
Novel Method ◽  
First Time ◽  
High Phase

A novel method for the preparation of permanent coating columns with a high phase ratio based on the multiple properties of PDA and LBL self-assembly of polydopamine/gold nanoparticles/thiols has been developed for the first time.

Polymerization induced self-assembly: tuning of nano-object morphology by use of CO2

2015 ◽  
Vol 6 (12) ◽  
pp. 2249-2254 ◽  
Author(s):  
Siming Dong ◽  
Wei Zhao ◽  
Frank P. Lucien ◽  
Sébastien Perrier ◽  
Per B. Zetterlund
Keyword(s):  
Self Assembly ◽  
Novel Method

A novel method for synthesis of polymeric nano-objects via polymerization-induced self-assembly in a CO2-expanded medium has been developed.

scholarly journals Silver Nanoparticle Surface Enabled Self-Assembly of Organic Dye Molecules

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2592 ◽  
Author(s):  
Deng ◽  
Yu
Keyword(s):  
Methylene Blue ◽  
Fluorescence Quenching ◽  
Silver Nanoparticle ◽  
Rhodamine B ◽  
Self Assembly ◽  
Shielding Effect ◽  
Eosin Y ◽  
Dye Molecules ◽  
Nanoparticle Surface ◽  
Sharp Turn

Fluorescence titration of methylene blue, rhodamine B and rhodamine 6G (R6G) by silver nanoparticle (AgNP) all resulted in an initial steep quenching curve followed with a sharp turn and a much flatter quenching curve. At the turn, there are about 200,000 dye molecules per a single AgNP, signifying self-assembly of approximately 36-layers of dye molecules on the surface of the AgNP to form a micelle-like structure. These fluorescence-quenching curves fit to a mathematical model with an exponential term due to molecular self-assembly on AgNP surface, or we termed it “self-assembly shielding effect”, and a Stern-Volmer term (nanoparticle surface enhanced quenching). Such a “super-quenching” by AgNP can only be attributed to “pre-concentration” of the dye molecules on the nanoparticle surface that yields the formation of micelle-like self-assembly, resulting in great fluorescence quenching. Overall, the fluorescence quenching titration reveals three different types of interactions of dye molecules on AgNP surface: 1) self-assembly (methylene blue, rhodamine B and R6G), 2) absorption/tight interaction (tryptamine and fluorescein), and 3) loose interaction (eosin Y). We attribute the formation of micelle-like self-assembly of these three dye molecules on AgNP to their positive charge, possession of nitrogen atoms, and with relatively large and flat aromatic moieties.

Superoxide Anion Biosensor Based on Bionic-Enzyme Hyperbranched Polyester Particles

2018 ◽  
Vol 71 (3) ◽  
pp. 119
Author(s):  
Yanlian Niu ◽  
Sisheng Hu ◽  
Qian Zhou ◽  
Yang Liu ◽  
Yuhong Liu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Hyperbranched Polyester ◽  
Manganese Phosphate ◽  
Transmission Electron ◽  
O2 Concentration ◽  
Ft Ir ◽  
Novel Method ◽  
Assembly Technology ◽  
Ft Ir Spectroscopy ◽  
Hyperbranched Structure

Self-assembly techniques have been demonstrated to be a useful approach to developing new functional nanomaterials. In this study, a novel method to fabricate a manganese phosphate self-assembly monolayer (SAM) on a hyperbranched polyester (HBPE-OH) nanoparticle surface is described. First, the second-generation aliphatic HBPE-OH was carboxy-terminated, phosphorylated, and then ionized with manganese by a three-step modification process. The final product of HBPE-AMPA-Mn2+ particles was obtained and characterised by FT-IR spectroscopy, 1H NMR spectroscopy, transmission electron microscopy (TEM), Zeta potential, and energy dispersive spectroscopy (EDS). Moreover, the HBPE-AMPA-Mn2+ particles were used to construct a novel biosensor for detection of superoxide anions (O2•−) released from HeLa cells. Results showed that the response currents of this biosensor were proportional to the O2•− concentration ranging from 0.79 to 16.6 μM, and provided an extremely low detection limit of 0.026 μM (S/N = 3). The results indicate that the particle-decorated electrode surface, which involved a hyperbranched structure and a surface self-assembly technology, proposed here will offer the ideal catalytic system for electrochemical enzymatic sensors.

Sign in / Sign up

Export Citation Format

Share Document