Synthesis and anisotropic self-assembly of Ag nanoparticles immobilized by the Pluronic F127 triblock copolymer for colorimetric detection of H2O2

RSC Advances ◽  
2015 ◽  
Vol 5 (118) ◽  
pp. 97648-97657 ◽  
Author(s):  
Cong Wu ◽  
Guangmei Xia ◽  
Jing Sun ◽  
Rui Song
Keyword(s):  
Green Synthesis ◽  
Self Assembly ◽  
Ag Nanoparticles ◽  
Triblock Copolymer ◽  
Colorimetric Detection ◽  
Pluronic F127 ◽  
Quantitative Detection ◽  
Ag Nps ◽  
Self Assembled

Facile and green synthesis of a Ag@DA@F127 system for the sensitive and quantitative detection of H2O2. Ag NPs in the network-like F127 micelles were well-dispersed and anisotropically self-assembled.

SANS study on self-assembled structures of Pluronic F127 triblock copolymer induced by additives and temperature

2013 ◽  
Vol 47 (1) ◽  
pp. 53-59 ◽  
Author(s):  
Tae-Hwan Kim ◽  
Young-Soo Han ◽  
Jong-Dae Jang ◽  
Baek-Seok Seong
Keyword(s):  
Aqueous Solution ◽  
Triblock Copolymer ◽  
Structural Information ◽  
Material Balance ◽  
The Self ◽  
Pluronic F127 ◽  
Spherical Micelle ◽  
Simple Material ◽  
Temperature Range ◽  
Self Assembled

In the temperature range of 303–333 K, the self-assembled structures of a mixture of Pluronic F127 triblock copolymer [PEO106PPO70PEO106; PEO is poly(ethylene oxide) and PPO is poly(propylene oxide)] and an organic derivative, 5-methyl salicylic acid (5mS), in aqueous solution have been investigated using small-angle neutron scattering (SANS). Above a 5mS concentration of 1.93 g l−1, the F127–5mS mixture solution became cloudy with a blue colour arising from the Tyndall effect, indicating that large polymer aggregates had formed in the mixture solution. SANS measurements showed that the self-assembled structure of the F127–5mS mixture transformed from a spherical to a cylindrical micelle with increasing the concentration of 5mS in the temperature range of 303–323 K. When the 5mS concentration was increased to 3.3 g l−1, the self-assembled structure of the F127–5mS mixture at 333 K underwent an additional phase transition from a cylindrical to a spherical micelle of large size at a 5mS concentration of 2.75 g l−1, although its self-assembled structure changed from a spherical to a cylindrical micelle at a 5mS concentration of 1.93 g l−1as well. The phase transitions are explained by the variation of the mass fraction of the hydrophilic part of F127 and the coupled effect of the limited solubility and the strong tendency to bind with amphiphilic molecules of 5mS. Using a simple material balance equation and the structural information obtained from SANS model analyses, the numbers of D2O and of 5mS molecules in the core and corona regions are calculated. This result can provide a simple and easy way to prepare various nanostructures using a Pluronic triblock copolymer in aqueous solution and may be very useful for practical applications of a Pluronic polymer such as various nanobuilding blocks or nanotemplates.

scholarly journals Evaluation of Self-Assembly Pathways to Control Crystallization-Driven Self-Assembly of a Semicrystalline P(VDF-co-HFP)-b-PEG-b-P(VDF-co-HFP) Triblock Copolymer

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 4033
Author(s):  
Enrique Folgado ◽  
Matthias Mayor ◽  
Vincent Ladmiral ◽  
Mona Semsarilar
Keyword(s):  
Self Assembly ◽  
Triblock Copolymer ◽  
Vinylidene Fluoride ◽  
The Self ◽  
Selective Solvents ◽  
Poly Vinylidene Fluoride ◽  
Self Assembled ◽  
Assembly Behavior ◽  
Assembly Pathways ◽  
Induced Crystallization

To date, amphiphilic block copolymers (BCPs) containing poly(vinylidene fluoride-co-hexafluoropropene) (P(VDF-co-HFP)) copolymers are rare. At moderate content of HFP, this fluorocopolymer remains semicrystalline and is able to crystallize. Amphiphilic BCPs, containing a P(VDF-co-HFP) segment could, thus be appealing for the preparation of self-assembled block copolymer morphologies through crystallization-driven self-assembly (CDSA) in selective solvents. Here the synthesis, characterization by 1H and 19F NMR spectroscopies, GPC, TGA, DSC, and XRD; and the self-assembly behavior of a P(VDF-co-HFP)-b-PEG-b-P(VDF-co-HFP) triblock copolymer were studied. The well-defined ABA amphiphilic fluorinated triblock copolymer was self-assembled into nano-objects by varying a series of key parameters such as the solvent and the non -solvent, the self-assembly protocols, and the temperature. A large range of morphologies such as spherical, square, rectangular, fiber-like, and platelet structures with sizes ranging from a few nanometers to micrometers was obtained depending on the self-assembly protocols and solvents systems used. The temperature-induced crystallization-driven self-assembly (TI-CDSA) protocol allowed some control over the shape and size of some of the morphologies.

scholarly journals Sphere-to-rod Transition of Block Copolymer in Solution Induced by Variation of Concentration

2020 ◽  
Author(s):  
Xiaoli Zhan
Keyword(s):  
Block Copolymer ◽  
Ethylene Oxide ◽  
Self Assembly ◽  
Triblock Copolymer ◽  
Short Chain ◽  
Copolymer Concentration ◽  
Poly Ethylene Oxide ◽  
Self Assembled ◽  
Assembly Behavior ◽  
Poly Ethylene

A short-chain triblock copolymer EO9-DMS7-EO9 was synthesized by couplingreaction of allyl-terminated poly(ethylene oxide) and Si–H-terminatedpoly(dimethylsiloxane). The structure and purity of synthesized copolymer wascarefully characterized. Self-assembly behavior of EO9-DMS7-EO9 triblockcopolymer in water was investigated. And it was found that along with theincrease of copolymer concentration, morphology of self-assembled aggregatestransits from sphere to rod. A plausible understanding of the morphologytransition for the investigated triblock copolymer was proposed

scholarly journals Silver nanoparticles: Green Synthesis and Their Antibacterial efficiency

2021 ◽  
Vol 59 (2) ◽  
pp. 214
Author(s):  
Dung Ngo Thanh ◽  
Nguyet Ha Minh ◽  
Tam Le Thi Thanh ◽  
Lu Le Trong
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Silver Nitrate ◽  
Tannic Acid ◽  
Ag Nanoparticles ◽  
Sodium Citrate ◽  
Reducing Agents ◽  
Ag Nps ◽  
Silver Nps

In this study, silver nanoparticles were synthesized from aqueous silver nitrate through a simple and eco-friendly route using a combination of two reducing agents: sodium citrate and tannic acid. By this method, the obtained Ag nanoparticles (NPs) were stable within the studied period of six months. Besides, both TEM images and UV-Vis results showed that the size of silver NPs could be controlled by changing the concentration of tannic acid. The antibacterial ability of Ag NPs with different sizes were also examined. In detail, the smaller the Ag NPs were, the more efficient their antibacterial activity was.

scholarly journals T-Nb2O5 nanoparticle enabled pseudocapacitance with fast Li-ion intercalation

Nanoscale ◽  
2018 ◽  
Vol 10 (29) ◽  
pp. 14165-14170 ◽  
Author(s):  
Lingping Kong ◽  
Xiaoteng Liu ◽  
Jinjia Wei ◽  
Steven Wang ◽  
Ben Bin Xu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Triblock Copolymer ◽  
Pluronic F127 ◽  
Evaporation Induced Self Assembly ◽  
Li Ion ◽  
Ion Intercalation

Orthorhombic Nb2O5 (T-Nb2O5) nanocrystallites are successfully fabricated through an evaporation induced self-assembly (EISA) method guided by a commercialised triblock copolymer – Pluronic F127.

The use of endogenous gaseous molecules (NO and CO2) to regulate the self-assembly of a dual-responsive triblock copolymer

2015 ◽  
Vol 6 (13) ◽  
pp. 2407-2415 ◽  
Author(s):  
Jinming Hu ◽  
Michael R. Whittaker ◽  
Yang Li ◽  
John F. Quinn ◽  
Thomas P. Davis
Keyword(s):  
Nitric Oxide ◽  
Carbon Dioxide ◽  
Aqueous Solution ◽  
Block Copolymer ◽  
Self Assembly ◽  
Triblock Copolymer ◽  
The Self ◽  
Dual Responsive ◽  
Self Assembled

A nitric oxide (NO) and carbon dioxide (CO2) dual-responsive block copolymer was self-assembled in aqueous solution upon gas stimuli to form nanostructures.

Highly sensitive and colorimetric detection of hydrogen sulphide by in situ formation of Ag2S@Ag nanoparticles in polyelectrolyte multilayer film

RSC Advances ◽  
2015 ◽  
Vol 5 (5) ◽  
pp. 3508-3511 ◽  
Author(s):  
Hongxia Fu ◽  
Xinrui Duan
Keyword(s):  
Hydrogen Sulphide ◽  
Ag Nanoparticles ◽  
Multilayer Film ◽  
Colorimetric Detection ◽  
Ag Nps ◽  
Polyelectrolyte Multilayer ◽  
Highly Sensitive ◽  
In Situ Formation ◽  
Polyelectrolyte Multilayer Film

Ag ion reacted with H2S gas in polyelectrolyte multilayer film to form Ag2S nanoparticles that catalyze the formation of Ag NPs.

Enzyme-triggeredin situformation of Ag nanoparticles with oxidase-mimicking activity for amplified detection of alkaline phosphatase activity

The Analyst ◽  
2019 ◽  
Vol 144 (7) ◽  
pp. 2416-2422 ◽  
Author(s):  
Hongwei Song ◽  
Zhibo Li ◽  
Yinxian Peng ◽  
Xin Li ◽  
Xuechao Xu ◽  
...  
Keyword(s):  
Alkaline Phosphatase ◽  
Phosphatase Activity ◽  
Alkaline Phosphatase Activity ◽  
Ag Nanoparticles ◽  
Colorimetric Detection ◽  
Ag Nps

ALP-triggeredin situformation of Ag NPs with high oxidase-mimicking activity for colorimetric detection of alkaline phosphatase activity.

Quantitative Detection with Surface Enhanced Raman Scattering (SERS) Using Self-Assembled Gold Nanoparticle Cluster Arrays

2013 ◽  
Vol 66 (9) ◽  
pp. 1034 ◽  
Author(s):  
Sanghamitra Dinda ◽  
Fung Ling Yap ◽  
Vignesh Suresh ◽  
Raju Kumar Gupta ◽  
Debajyoti Das ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Self Assembly ◽  
High Sensitivity ◽  
Surface Enhanced Raman Spectroscopy ◽  
High Density ◽  
Quantitative Detection ◽  
Surface Enhanced ◽  
Nanoparticle Clusters ◽  
Surface Enhanced Raman ◽  
Self Assembled

We analysed sensitivity of high-density arrays of self-assembled gold nanoparticle clusters towards trace analyte detection and quantitative determination by surface enhanced Raman spectroscopy (SERS) employing an aromatic thiol as probe molecule. Periodic nanoscale arrays of gold nanoparticle clusters consisting of an average of 18 nanoparticles per cluster, and exhibiting mean inter-particle and inter-cluster separations below 10 nm were prepared using electrostatic self-assembly on block copolymer templates. The concentration dependent scaling of SERS intensities and the lowest detection limits on the cluster arrays on silicon substrate was probed using 1-naphthalenethiol (NT) as test molecule. The substrates show a detection limit of 10 nM along with high sensitivity to changes in NT concentration, which we attribute to high density of hot-spots uniformly organised across the surface. The capability for facile realisation of such arrays without a clean room environment or expensive tools makes the approach suitable for adoption for economic and high-performing SERS sensors.

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