Conformation of Myoglobin‐Poly(Ethyl Ethylene Phosphate) Conjugates Probed by SANS: Correlation with Polymer Grafting Density and Interaction

2021 ◽  
pp. 2000356
Author(s):  
Daniela Russo ◽  
Christopher J. Garvey ◽  
Frederick R. Wurm ◽  
José Teixeira
Keyword(s):  
Polymer Grafting ◽  
Grafting Density

Interaction Between Soft Nanoparticles and Phospholipid Membranes: Effect of the Polymer-Grafting Density on Nanoparticle Adsorption

2019 ◽  
Vol 2 (4) ◽  
pp. 1808-1819 ◽  
Author(s):  
Marek Sokolowski ◽  
Zehra Parlak ◽  
Christopher Bartsch ◽  
Stefan Zauscher ◽  
Michael Gradzielski
Keyword(s):  
Phospholipid Membranes ◽  
Polymer Grafting ◽  
Grafting Density ◽  
Soft Nanoparticles

Effect of Polymer Grafting Density on Mechanophore Activation at Heterointerfaces

2016 ◽  
Vol 5 (7) ◽  
pp. 819-822 ◽  
Author(s):  
Jun Li ◽  
Bin Hu ◽  
Ke Yang ◽  
Bin Zhao ◽  
Jeffrey S. Moore
Keyword(s):  
Polymer Grafting ◽  
Grafting Density

Effect of polymer grafting density on silica nanoparticle toxicity

2012 ◽  
Vol 20 (23) ◽  
pp. 6862-6869 ◽  
Author(s):  
I-Chun Lin ◽  
Mingtao Liang ◽  
Tzu-Yu Liu ◽  
Zhongfan Jia ◽  
Michael J. Monteiro ◽  
...  
Keyword(s):  
Silica Nanoparticle ◽  
Polymer Grafting ◽  
Nanoparticle Toxicity ◽  
Grafting Density

scholarly journals Bottlebrush polymers in the melt and polyelectrolytes in solution share common structural features

2020 ◽  
Vol 117 (10) ◽  
pp. 5168-5175 ◽  
Author(s):  
Joel M. Sarapas ◽  
Tyler B. Martin ◽  
Alexandros Chremos ◽  
Jack F. Douglas ◽  
Kathryn L. Beers
Keyword(s):  
Neutron Scattering ◽  
Correlation Length ◽  
Salt Concentration ◽  
Polymer Concentration ◽  
Structural Features ◽  
Peak Position ◽  
Correlation Peak ◽  
Grafting Density ◽  
Scattering Measurements ◽  
Polyelectrolyte Solutions

Uncharged bottlebrush polymer melts and highly charged polyelectrolytes in solution exhibit correlation peaks in scattering measurements and simulations. Given the striking superficial similarities of these scattering features, there may be a deeper structural interrelationship in these chemically different classes of materials. Correspondingly, we constructed a library of isotopically labeled bottlebrush molecules and measured the bottlebrush correlation peak position q*=2π/ξ by neutron scattering and in simulations. We find that the correlation length scales with the backbone concentration, ξ∼cBB−0.47, in striking accord with the scaling of ξ with polymer concentration cP in semidilute polyelectrolyte solutions (ξ∼cP−1/2). The bottlebrush correlation peak broadens with decreasing grafting density, similar to increasing salt concentration in polyelectrolyte solutions. ξ also scales with sidechain length to a power in the range of 0.35–0.44, suggesting that the sidechains are relatively collapsed in comparison to the bristlelike configurations often imagined for bottlebrush polymers.

scholarly journals Effects of Amino Acid Side-Chain Length and Chemical Structure on Anionic Polyglutamic and Polyaspartic Acid Cellulose-Based Polyelectrolyte Brushes

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1789
Author(s):  
Dmitry Tolmachev ◽  
George Mamistvalov ◽  
Natalia Lukasheva ◽  
Sergey Larin ◽  
Mikko Karttunen
Keyword(s):  
Glutamic Acid ◽  
Chain Length ◽  
Chemical Structure ◽  
Side Chain ◽  
Side Chains ◽  
Side Chain Length ◽  
Polyelectrolyte Brushes ◽  
Grafting Density ◽  
The Difference ◽  
Cellulose Surface

We used atomistic molecular dynamics (MD) simulations to study polyelectrolyte brushes based on anionic α,L-glutamic acid and α,L-aspartic acid grafted on cellulose in the presence of divalent CaCl2 salt at different concentrations. The motivation is to search for ways to control properties such as sorption capacity and the structural response of the brush to multivalent salts. For this detailed understanding of the role of side-chain length, the chemical structure and their interplay are required. It was found that in the case of glutamic acid oligomers, the longer side chains facilitate attractive interactions with the cellulose surface, which forces the grafted chains to lie down on the surface. The additional methylene group in the side chain enables side-chain rotation, enhancing this effect. On the other hand, the shorter and more restricted side chains of aspartic acid oligomers prevent attractive interactions to a large degree and push the grafted chains away from the surface. The difference in side-chain length also leads to differences in other properties of the brush in divalent salt solutions. At a low grafting density, the longer side chains of glutamic acid allow the adsorbed cations to be spatially distributed inside the brush resulting in a charge inversion. With an increase in grafting density, the difference in the total charge of the aspartic and glutamine brushes disappears, but new structural features appear. The longer sides allow for ion bridging between the grafted chains and the cellulose surface without a significant change in main-chain conformation. This leads to the brush structure being less sensitive to changes in salt concentration.

Biofouling-Resistant Porous Membranes with a Precisely Adjustable Pore Diameter via 3D Polymer Grafting

2019 ◽  
Vol 11 (20) ◽  
pp. 18268-18275
Author(s):  
Hidenori Kuroki ◽  
Alexey Gruzd ◽  
Igor Tokarev ◽  
Taras Patsahan ◽  
Jaroslav Ilnytskyi ◽  
...  
Keyword(s):  
Pore Diameter ◽  
Porous Membranes ◽  
Polymer Grafting

Direct Growth of Polyaniline Chains from Nitrogen Site of N-Doped Carbon Nanotubes for High Performance Supercapacitor

2014 ◽  
Vol 93 ◽  
pp. 164-167 ◽  
Author(s):  
Joon Won Lim ◽  
Atta Ul Haq ◽  
Sang Ouk Kim
Keyword(s):  
Carbon Nanotubes ◽  
High Performance ◽  
Chemical Structure ◽  
Carbon Materials ◽  
Graphitic Carbon ◽  
Polymer Grafting ◽  
Aniline Monomer ◽  
Defect Site ◽  
Direct Growth ◽  
Grafting From

Polymer grafting from graphitic carbon materials has been explored for several decades. Currently existing methods mostly employ harsh chemical treatment to generate defect site in graphitic carbon plane, which are used as active site for polymerization of precursors. Unfortunately, the treatment cause serious degradation of chemical structure and material properties. Here, we present a straightforward route for growth of polyaniline chain from nitrogen (N)-sites of carbon nanotubes. N site in the CNT wall initiates the polymerization of aniline monomer, which generates seamless hybrids composed of polyaniline directly grafted onto the CNT walls. The synthesized hybrids show excellent synergistic electrochemical performance, and are employed for electrodes of pseudo-capacitor. This approach offers an efficient way to obtain hybrid system consisting of conducting polymers directly grafted from graphitic dopant sites.

Poly(ethylene oxide) Grafted to Silicon Surfaces: Grafting Density and Protein Adsorption

1998 ◽  
Vol 31 (15) ◽  
pp. 5059-5070 ◽  
Author(s):  
Susan J. Sofia ◽  
V. Premnath ◽  
Edward W. Merrill
Keyword(s):  
Ethylene Oxide ◽  
Protein Adsorption ◽  
Silicon Surfaces ◽  
Grafting Density ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Tuning Fluorescent Response of Nanoscale Film With Polymer Grafting

2011 ◽  
Vol 33 (3) ◽  
pp. 237-241 ◽  
Author(s):  
Marius Chyasnavichyus ◽  
Volodymyr Tsyalkovsky ◽  
Bogdan Zdyrko ◽  
Igor Luzinov
Keyword(s):  
Polymer Grafting ◽  
Fluorescent Response
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