Effective oxidation protection of polymer micelles for copper nanoparticles in water

RSC Advances ◽  
2014 ◽  
Vol 4 (27) ◽  
pp. 14193-14196 ◽  
Author(s):  
Hang Lu ◽  
Li Yu ◽  
Bo Yang ◽  
Jianing Si ◽  
Jianzhong Du
Keyword(s):  
Block Copolymer ◽  
Copper Nanoparticles ◽  
Diffusion Barrier ◽  
Copper Nanoparticle ◽  
Hydrophobic Core ◽  
Polymer Micelles ◽  
Oxidation Protection ◽  
Water Dispersible ◽  
Copolymer Micelle

Copper nanoparticles are often susceptible to rapid oxidation in water. We report a water-dispersible and long-term stable copper nanoparticle protected by a block copolymer micelle that can effectively inhibit the access of oxygen to the copper inside its hydrophobic core, providing a sufficient diffusion barrier against oxidation in water.

Biogenic synthesis of copper nanoparticles from rose (Rosa indica L.) and their applications in photocatalytic degradation of Malachite Green and Carbol Fuchsin dyes

2020 ◽  
Vol 10 ◽  
Author(s):  
Manmeet Kaur ◽  
Suman Prajapati ◽  
Samneek Cholia ◽  
Jaskeet Singh Mann ◽  
Gurpreet Singh
Keyword(s):  
Photocatalytic Degradation ◽  
Malachite Green ◽  
Copper Nanoparticles ◽  
Dye Degradation ◽  
Industrial Effluent ◽  
Copper Nanoparticle ◽  
Synthesis Of Nanoparticles ◽  
Carbol Fuchsin ◽  
Double Beam ◽  
The Rose

Background: In the recent years, the green synthesis of nanoparticles has taken a lead role over the conventional chemical and physical approach due to its non-toxic, cost effective parameters and has found its place in various applications. Objectives: The major objectives of this study was to synthesise and characterize the copper nanoparticles using the rose extract at different set of conditions and analyse these nanoparticles as a source of dye degradation agent under sunlight conditions. Methods: Present study was conducted with the aim to synthesis the copper nanoparticle using the rose petal extract. The components present the in the extract act as the reduction and stabilization agents for the synthesis of CuNPs. The synthesized nanoparticles were characterized by using UV-VIS, FTIR, XRD and SEM analysis. Photocatalytic degradation of two dyes (Malachite Green and Carbol fuchsin) was analysed using double beam spectroscopic analysis Results: UV-Vis analysis indicated the presence of a peak at around 630 nm. The FT-IR analysis indicated the involvement of various biomolecules during the synthesis of nanoparticles. The structure and the conformation was elucidated using XRD and SEM showed the agglomerated form of the synthesized nanoparticles with the size range of about 60-90 nm. The synthesised copper nanoparticles was used for degradation of malachite green and carbol fuchsin dye using photocatalytic under sunlight irradiation. UV-Vis spectral analysis indicated that synthesised copper nanoparticle act more effective in degradation of malachite green (around 95%) whereas carbol fuchsin showed a maximum degradation by 52% therefore suggesting that CuNPs act as an efficient photo catalyst in dye degradation. Conclusion: The results obtained from this study indicates that rose extract has the potential of synthesis of copper nanoparticles which is non-toxic and convenient approach as compared to physical and chemical synthesis. These nanoparticles can be effectively employed as dye decolourization agents to treat industrial effluent and prevent the environmental pollution.

scholarly journals Effect of Molecular Architecture on Associating Behavior of Star-Like Amphiphilic Polymers Consisting of Plural Poly(ethylene oxide) and One Alkyl Chain

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 460
Author(s):  
Daisuke Kugimoto ◽  
Aoi Taniguchi ◽  
Masaki Kinoshita ◽  
Isamu Akiba
Keyword(s):  
Ethylene Oxide ◽  
Average Molecular Weight ◽  
Amphiphilic Polymers ◽  
Hydrophobic Core ◽  
Molecular Architecture ◽  
Polymer Micelles ◽  
The Core ◽  
X Ray Scattering ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Associating behavior of star-like amphiphilic polymers consisting of two or three poly(ethylene oxide) (PEO) chains and one stearyl chain (C18) was investigated. Although the aggregation number (Nagg) of linear analogue of amphiphilic polymers monotonically decreased with increasing number-average molecular weight of PEO (Mn,PEO), the Nagg of micelles of star-like amphiphilic polymers with Mn,PEO = 550 g/mol was smaller than that with Mn,PEO = 750 g/mol, whereas that with Mn,PEO ≥ 750 g/mol showed general Mn,PEO dependence. Small-angle X-ray scattering analyses revealed that the occupied area of one PEO chain on the interface between hydrophobic core and corona layer in the micelles of star-like polymers was much narrower than that in the linear amphiphilic polymers. This result indica ted the PEO chains of star-like polymers partially took unfavorable conformation near the core–corona interface in polymer micelles. The effect of local conformation of PEO chains near the interface on the associating behavior became significant as Mn,PEO decreased. Therefore, in polymer micelles of star-like amphiphilic polymers containing PEO with Mn,PEO = 550 g/mol, the enlargement of occupied area of PEO on the core–corona interface should be caused to avoid the formation of unfavorable conformations of partial PEO chains, resulting in a decrease in Naggs.

Switchable pH-Responsive Polymeric Membranes Prepared via Block Copolymer Micelle Assembly

ACS Nano ◽  
2011 ◽  
Vol 5 (5) ◽  
pp. 3516-3522 ◽  
Author(s):  
Suzana P. Nunes ◽  
Ali Reza Behzad ◽  
Bobby Hooghan ◽  
Rachid Sougrat ◽  
Madhavan Karunakaran ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Polymeric Membranes ◽  
Ph Responsive ◽  
Block Copolymer Micelle ◽  
Copolymer Micelle

Block Copolymer Micelle Structure Modulated by Ionic Liquids

2021 ◽  
pp. 118195
Author(s):  
Yi Zhang ◽  
Zhiqi He ◽  
Paschalis Alexandridis ◽  
Marina Tsianou
Keyword(s):  
Ionic Liquids ◽  
Block Copolymer ◽  
Block Copolymer Micelle ◽  
Micelle Structure ◽  
Copolymer Micelle

scholarly journals An amphiphilic, heterografted polythiophene copolymer containing biocompatible/biodegradable side chains for use as an (electro)active surface in biomedical applications

2019 ◽  
Vol 10 (36) ◽  
pp. 5010-5022 ◽  
Author(s):  
Brenda G. Molina ◽  
Luminita Cianga ◽  
Anca-Dana Bendrea ◽  
Ioan Cianga ◽  
Carlos Alemán ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Redox Reaction ◽  
Biomedical Applications ◽  
Active Surface ◽  
Side Chains ◽  
Hydrophobic Core

Design of an amphiphilic heterografted block copolymer composed of a hydrophobic core backbone and both hydrophilic side chains, able to detect the redox reaction of NADH.

Polymer Micelles with Hydrophobic Core and Ionic Amphiphilic Corona. 2. Starlike Distribution of Charged and Nonpolar Blocks in Corona

Langmuir ◽  
2012 ◽  
Vol 28 (34) ◽  
pp. 12663-12670 ◽  
Author(s):  
Evgeny A. Lysenko ◽  
Alevtina I. Kulebyakina ◽  
Pavel S. Chelushkin ◽  
Artem M. Rumyantsev ◽  
Elena Yu. Kramarenko ◽  
...  
Keyword(s):  
Hydrophobic Core ◽  
Polymer Micelles

Histological study on side effects and tumor targeting of a block copolymer micelle on rats

2009 ◽  
Vol 136 (3) ◽  
pp. 240-246 ◽  
Author(s):  
Takanori Kawaguchi ◽  
Takashi Honda ◽  
Masamichi Nishihara ◽  
Tatsuhiro Yamamoto ◽  
Masayuki Yokoyama
Keyword(s):  
Side Effects ◽  
Block Copolymer ◽  
Tumor Targeting ◽  
Histological Study ◽  
Block Copolymer Micelle ◽  
Copolymer Micelle
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