Softening of PMMA Brushes upon Collapse/Swelling Transition. A Combined Neutron Reflectivity and Nanomechanical Cantilever Sensor Study

2011 ◽  
Vol 44 (2) ◽  
pp. 360-367 ◽  
Author(s):  
Sebastian Lenz ◽  
Adrian Rühm ◽  
Janos Major ◽  
Rüdiger Berger ◽  
Jochen S. Gutmann
Keyword(s):  
Neutron Reflectivity ◽  
Cantilever Sensor ◽  
Swelling Transition

Multi-Stimuli-Responsive Mesoporous Membranes and Effect of Molecular Architecture on Thermo- and pH-Responsive Behavior of the grafted Block Copolymer brushes

2019 ◽  
Author(s):  
Yanchun Tang ◽  
Kohzo Ito ◽  
Hideaki Yokoyama
Keyword(s):  
Polymer Brushes ◽  
Diblock Copolymers ◽  
Neutron Reflectivity ◽  
Molecular Architecture ◽  
Stimuli Responsive ◽  
Responsive Polymer ◽  
The Matrix ◽  
Stable Part ◽  
Copolymer Brushes ◽  
Mesoporous Membranes

In this study, we prepared ultrafiltration membranes with a decoupled responses of filtration property to temperature and pH. The membrane preparation method was developed based on our previous work. We utilized methanol-supercritical carbon dioxide (methanol-scCO<sub>2</sub>) selective swelling method to introduce nanopores to block copolymers containing poly(diethylene glycol) methyl ether methacrylate (PMEO<sub>2</sub>MA), poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) and polystyrene (PS) blocks. Formation of the mesoporous barrier layer with PS being the mechanically stable part of the matrix was driven by selective swelling of the PMEO<sub>2</sub>MA-b-PDMAEMA domains. Due to the selective swelling of PMEO<sub>2</sub>MA or PDMAEMA domains to introduce pores, the interior of the pores are covered with PMEO<sub>2</sub>MA or PDMAEMA blocks after pore formation. The PMEO<sub>2</sub>MA-b-PDMAEMA polymer brushes are naturally attached on the pore walls and worked as functional gates. PMEO<sub>2</sub>MA is a non-toxic, neutral thermo-responsive polymer with LCST at 26 ᴼC. PDMAEMA is a typical weak polyelectrolyte with pK<sub>a</sub> value at 7.0-7.5 and also a thermo-responsive polymer revealed a LCST of 20-80 °C in aqueous solution. Therefore, these membranes were expected to have multi dimensions as function of the combination of temperature and pH. Moreover, to understand the detail of the temperature and pH depended conformation transitions of PMEO<sub>2</sub>MA-b-PDMAEMA brushes, those diblock copolymers were end-tethered on flat substrates and analyzed via neutron reflectivity (NR).

Structural Determination of High Density, ATRP Grown Polystyrene Brushes by Neutron Reflectivity

2009 ◽  
Vol 42 (24) ◽  
pp. 9523-9527 ◽  
Author(s):  
John R. Ell ◽  
Dennis E. Mulder ◽  
Roland Faller ◽  
Timothy E. Patten ◽  
Tonya L. Kuhl
Keyword(s):  
High Density ◽  
Neutron Reflectivity ◽  
Structural Determination

scholarly journals Effect of water on the electroresponsive structuring and friction in dilute and concentrated ionic liquid lubricant mixtures

2020 ◽  
Vol 22 (48) ◽  
pp. 28191-28201
Author(s):  
Georgia A. Pilkington ◽  
Rebecca Welbourn ◽  
Anna Oleshkevych ◽  
Seiya Watanabe ◽  
Patricia Pedraz ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Ionic Liquid ◽  
Neutron Reflectivity ◽  
Force Microscopy ◽  
Liquid Lubricant ◽  
Effect Of Water ◽  
Atomic Force ◽  
Ambient Levels

The influence of ambient levels of water on the electroresponsive interfacial structuring and nanofriction of ionic liquid lubricant mixtures has been investigated by neutron reflectivity and atomic force microscopy.

Neutron reflectivity studies of adsorption and wetting in the vicinity of a liquid/liquid critical point: alkane + perfluoroalkane mixtures at a silicon interface

1998 ◽  
Vol 10 (37) ◽  
pp. 8173-8188 ◽  
Author(s):  
James Bowers ◽  
Emilio Manzanares-Papayanopoulos ◽  
Ian A McLure ◽  
Robert Cubitt
Keyword(s):  
Critical Point ◽  
Neutron Reflectivity ◽  
Silicon Interface

Neutron reflectivity study of thin films of hydrogen-bonded polymer blends: influence of annealing on composition profile

1992 ◽  
Vol 25 (10) ◽  
pp. 2619-2623 ◽  
Author(s):  
Lei Jong ◽  
Eli M. Pearce ◽  
T. K. Kwei ◽  
W. A. Hamilton ◽  
G. S. Smith ◽  
...  
Keyword(s):  
Thin Films ◽  
Polymer Blends ◽  
Composition Profile ◽  
Neutron Reflectivity ◽  
Hydrogen Bonded

Specular and off-specular polarized neutron reflectivity at Dhruva

Neutron News ◽  
2014 ◽  
Vol 25 (1) ◽  
pp. 31-33 ◽  
Author(s):  
Surendra Singh ◽  
Debarati Bhattacharya ◽  
Saibal Basu
Keyword(s):  
Neutron Reflectivity ◽  
Polarized Neutron

Wavelet Analysis of Neutron Reflectivity†

Langmuir ◽  
2003 ◽  
Vol 19 (19) ◽  
pp. 7811-7817 ◽  
Author(s):  
N. F. Berk ◽  
C. F. Majkrzak
Keyword(s):  
Wavelet Analysis ◽  
Neutron Reflectivity

scholarly journals Magnetic properties of individual Co2FeGa Heusler nanoparticles studied at room temperature by a highly sensitive co-resonant cantilever sensor

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Julia Körner ◽  
Christopher F. Reiche ◽  
Rasha Ghunaim ◽  
Robert Fuge ◽  
Silke Hampel ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Cantilever Sensor ◽  
Highly Sensitive ◽  
Resonant Cantilever

An electrochemical cell with vertical geometry for neutron reflectivity measurements

2018 ◽  
Vol 551 ◽  
pp. 270-273 ◽  
Author(s):  
Mari Mizusawa ◽  
Kenji Sakurai ◽  
Dai Yamazaki ◽  
Masayasu Takeda
Keyword(s):  
Electrochemical Cell ◽  
Neutron Reflectivity
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