scholarly journals Temperature-triggered formation of a cellulose II nanocrystal network through regioselective derivatization

Nanoscale ◽  
2021 ◽  
Author(s):  
Fangbo Lin ◽  
Jean-Luc Putaux ◽  
Frédéric Pignon ◽  
Bruno Jean
Keyword(s):  
Gold Nanoparticles ◽  
Polymer Chains ◽  
Cellulose Ii ◽  
Thermosensitive Polymer ◽  
First Case

The two ends of rodlike cellulose II nanocrystals (CNC-II) were regioselectively functionalized either with gold nanoparticles or thermosensitive polymer chains. In the first case, after the introduction of sulfur atoms...

Redox-active polymer-nanoparticle hybrid materials

2000 ◽  
Vol 72 (1-2) ◽  
pp. 67-72 ◽  
Author(s):  
Keith J. Watson ◽  
Jin Zhu ◽  
SonBinh T. Nguyen ◽  
Chad A. Mirkin
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymers ◽  
Hybrid Materials ◽  
Ring Opening ◽  
Gel Permeation Chromatography ◽  
Polymer Chains ◽  
Electrochemical Studies ◽  
Redox Active ◽  
Gel Permeation ◽  
Current Rectification

Ring-opening metathesis polymerization was used to modify organic soluble gold nanoparticles with redox-active polymers. A gel-permeation chromatography study revealed that each nanoparticle is modified with approximately 11 polymer chains. Electrochemical studies of nanoparticles modified with block copolymers of two different redox-active groups revealed that each monomer is electrochemically accessible, while no current rectification was observed.

Thermosensitive polymer-modified gold nanoparticles with sensitive fluorescent properties

2016 ◽  
Vol 664 ◽  
pp. 89-95 ◽  
Author(s):  
Chunhua Luo ◽  
Qiujing Dong ◽  
Meijuan Qian ◽  
Hong Zhang
Keyword(s):  
Gold Nanoparticles ◽  
Fluorescent Properties ◽  
Thermosensitive Polymer

Reversible Controlled Assembly of Thermosensitive Polymer-Coated Gold Nanoparticles

Langmuir ◽  
2011 ◽  
Vol 27 (20) ◽  
pp. 12329-12335 ◽  
Author(s):  
Céline Durand-Gasselin ◽  
Nicolas Sanson ◽  
Nicolas Lequeux
Keyword(s):  
Gold Nanoparticles ◽  
Thermosensitive Polymer ◽  
Controlled Assembly

scholarly journals Hydrogen Bonding: A Bottom-Up Approach for the Synthesis of Films Composed of Gold Nanoparticles

2008 ◽  
Vol 2 ◽  
pp. 115-128 ◽  
Author(s):  
Mariana Chirea ◽  
Carlos M. Pereira ◽  
Fernando Silva
Keyword(s):  
Gold Nanoparticles ◽  
Hydrogen Bonding ◽  
Exchange Reaction ◽  
Film Formation ◽  
Gold Clusters ◽  
Blue Color ◽  
Mercaptosuccinic Acid ◽  
First Case ◽  
Place Exchange ◽  
Film Synthesis

Citrate gold nanoparticles of 13.5 nm average diameters have been synthesized by Turkevich method and further functionalized by place exchange reaction using mercaptosuccinic acid (MSA), 1,4-benezenedimethanethiol (1,4BDMT) or mercaptoundecanoic acid (MUA) as the incoming ligands. In the first case, the functionalization of the gold clusters with MSA yielded solution of blue color and large aggregates on carbon grids. Moreover, after filtration and drying, any film formed by hydrogen bonding, could not be removed from the filter, being embedded into the filter texture. The second ligand used for the place exchange reaction, the 1,4BDMT, determined the change of the solution color from red to dark purple, and generation of a purple powder but no film formation. In the third case, the purification and drying of the MUA functionalized gold clusters yielded films of purple color with homogenous composition, robustness, soft topographies and remarkable optical properties which were dependent on their thicknesses. The Au-MUA NP films obtained are new, being generated by hydrogen bonding and having features which makes them very attractive for the fabrication of optoelectronic devices. The long alkyl chained thiol proved to be the adequate ligand for film synthesis.

Meso-scale Simulations of Poly(N-isopropylacrylamide) Grafted Architectures

2014 ◽  
Vol 1619 ◽  
Author(s):  
Sanket A. Deshmukh ◽  
Ganesh Kamath ◽  
Derrick C. Mancini ◽  
Subramanian K.R.S. Sankaranarayanan ◽  
Wei Jiang
Keyword(s):  
Conformational Dynamics ◽  
Md Simulations ◽  
Polymer Chains ◽  
Effect Of Temperature ◽  
Solution Temperature ◽  
Radius Of Gyration ◽  
Core Particle ◽  
Thermosensitive Polymer ◽  
Critical Solution Temperature ◽  
Different Diameters

ABSTRACTPoly(N-isopropylacrylamide) (PNIPAM) is a thermosensitive polymer that is well-known for its behavior at a lower critical solution temperature (LCST) around 305 K. Below the LCST, PNIPAM is soluble in water, and above this temperature, polymer chains collapse and transform into a globule state. The conformational dynamics of single chains of polymer in a solution is known to be different from those of grafted structures that comprise of an ensemble of such single chains. In this study, we have carried out MD simulations of a mesoscopic nanostructure of PNIPAM polymer chains consisting of 60 monomer units grafted onto gold nanoparticles of different diameters, to study the effect of temperature and core particle size on the polymer conformations. Additionally, we have also studied the effect of grafting density on the coil-to-globule transition exhibited by PNIPAM through the LCST. The systems investigated consisted of ∼3 and ∼6 million atoms. Simulations were carried out below and above the LCST of PNIPAM, at 275K and 325K. Simulation trajectories were analyzed for radius of gyration of PNIPAM chains.

Poly(N-isopropylacrylamide) coated gold nanoparticles as colourimetric temperature and salt sensors

2016 ◽  
Vol 7 (9) ◽  
pp. 1705-1710 ◽  
Author(s):  
Samarendra Maji ◽  
Belgin Cesur ◽  
Zhiyue Zhang ◽  
Bruno G. De Geest ◽  
Richard Hoogenboom
Keyword(s):  
Gold Nanoparticles ◽  
Polymer Chains

Thermoresponsive PNIPAM coated AuNPs having dual stabilisation by the polymer chains and the charges, has been utilised for the development of temperature and salt sensors.

Blue light emitting gold nanoparticles functionalized with non-thiolate thermosensitive polymer ligand: optical properties, assemblies and application

RSC Advances ◽  
2014 ◽  
Vol 4 (100) ◽  
pp. 57245-57249 ◽  
Author(s):  
Bingxin Liu ◽  
Yue Wang ◽  
Mingxiao Deng ◽  
Jianhua Lü ◽  
Cuiyan Tong ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Blue Light ◽  
Thermosensitive Polymer ◽  
Light Emitting ◽  
Aggregation Induced Emission ◽  
Emission Enhancement ◽  
Thermosensitive Copolymer ◽  
Polymer Ligand

The thermosensitive copolymer ligand was employed as scaffold to construct the blue light emitting gold nanoparticles. These nanoparticles show interesting assemblies, aggregation-induced emission enhancement and selective sensing for Hg2+.

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