Determining the density profile of confined polymer brushes with neutron reflectivity

2004 ◽  
Vol 42 (17) ◽  
pp. 3290-3301 ◽  
Author(s):  
W. A. Hamilton ◽  
G. S. Smith ◽  
N. A. Alcantar ◽  
J. Majewski ◽  
R. G. Toomey ◽  
...  
Keyword(s):  
Density Profile ◽  
Polymer Brushes ◽  
Neutron Reflectivity ◽  
Confined Polymer

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).

Density Profile of Spherical Polymer Brushes

1996 ◽  
Vol 77 (1) ◽  
pp. 95-98 ◽  
Author(s):  
S. Förster ◽  
E. Wenz ◽  
P. Lindner
Keyword(s):  
Density Profile ◽  
Polymer Brushes

Interfacial Segment Density Profile of Adsorbed β-Casein from Neutron Reflectivity Measurements

2005 ◽  
pp. 396-401
Author(s):  
Eric Dickinson ◽  
David S. Horne ◽  
J.S. Phipps ◽  
R.M. Richardson
Keyword(s):  
Density Profile ◽  
Neutron Reflectivity

Neutron reflectivity studies of confined polymer/polymer interfaces approaching criticality

2006 ◽  
Vol 385-386 ◽  
pp. 706-708 ◽  
Author(s):  
M. Sferrazza ◽  
C. Carelli ◽  
R.A.L. Jones ◽  
R.N. Young
Keyword(s):  
Neutron Reflectivity ◽  
Polymer Interfaces ◽  
Confined Polymer

Stratification in Bidisperse Polymer Brushes from Neutron Reflectivity

1998 ◽  
Vol 31 (8) ◽  
pp. 2616-2621 ◽  
Author(s):  
Rastislav Levicky ◽  
Nagraj Koneripalli ◽  
Matthew Tirrell ◽  
Sushil K. Satija
Keyword(s):  
Polymer Brushes ◽  
Neutron Reflectivity

Applications of Neutron Reflectivity Measurements to Nanoscience: Thin Films and Interfaces

MRS Bulletin ◽  
2003 ◽  
Vol 28 (12) ◽  
pp. 918-922 ◽  
Author(s):  
John F. Ankner ◽  
Hartmut Zabel
Keyword(s):  
Thin Films ◽  
Density Profile ◽  
Materials Science ◽  
Kinetic Studies ◽  
Film Plane ◽  
Small Sample ◽  
Neutron Reflectivity ◽  
Nuclear Density ◽  
Essential Difference ◽  
Reflectivity Data

AbstractNeutron reflectivity has matured in recent years from an exotic method used only by a few experts to an essential tool for the investigation of thin films and interfaces on the nanoscale. In contrast to x-ray reflectivity, which provides electron density profiles, neutron reflectivity reveals the nuclear density profile. This is an essential difference when exploring hydrogenous materials such as polymers, Langmuir–Blodgett films, and membranes. Furthermore, neutrons carry a magnetic moment that interacts with the magnetic induction of the film, revealing, in addition to the nuclear density profile, the magnetic density profile in layers and superlattices. Recent developments in the analysis of off-specular neutron reflectivity data enable the characterization of chemical and magnetic correlations within the film plane on nanometer to micron length scales. A new generation of pulsed neutron sources, featuring flux enhancements of factors of 10–100 over existing sources, will make these types of measurements even more exciting, while kinetic studies, pump-probe, and small-sample experiments will become feasible, opening new windows onto nanoscale materials science.

Neutron Reflectivity Study of the Density Profile of a Model End-Grafted Polymer Brush: Influence of Solvent Quality

1994 ◽  
Vol 73 (25) ◽  
pp. 3407-3410 ◽  
Author(s):  
A. Karim ◽  
S. K. Satija ◽  
J. F. Douglas ◽  
J. F. Ankner ◽  
L. J. Fetters
Keyword(s):  
Density Profile ◽  
Polymer Brush ◽  
Neutron Reflectivity ◽  
Grafted Polymer ◽  
Solvent Quality ◽  
Influence Of Solvent

Temperature Dependence of the Morphology of Thin Diblock Copolymer Films as Revealed by Neutron Reflectivity

1989 ◽  
Vol 166 ◽  
Author(s):  
T. P. Russell ◽  
S. H. Anastasiadis ◽  
S. K. Satija ◽  
C. F. Majkrzak
Keyword(s):  
Thin Films ◽  
Temperature Dependence ◽  
Density Profile ◽  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Decay Length ◽  
Neutron Reflectivity ◽  
Copolymer Films ◽  
Lamellar Morphology ◽  
Oriented Parallel

ABSTRACTThe order-disorder transition in thin films of symmetric diblock copolymers of polystyrene and polymethylmethacrylate has been investigated by neutron reflectivity. At temperatures above the order-disorder temperature, TMST, a surface induced oscillatory segment density profile with an exponential decay length, χ, is observed. The inverse of decay length 1/≤ TMST a lamellar morphology oriented parallel to the surface propagates through the entire specimen.

Local structure and density profile of polymer brushes

1992 ◽  
Vol 69 (1) ◽  
pp. 93-95 ◽  
Author(s):  
P. Auroy ◽  
Y. Mir ◽  
L. Auvray
Keyword(s):  
Density Profile ◽  
Local Structure ◽  
Polymer Brushes

Neutron Reflectivity Study of the Structure of pH-Responsive Polymer Brushes Grown from a Macroinitiator at the Sapphire−Water Interface

Langmuir ◽  
2010 ◽  
Vol 26 (15) ◽  
pp. 12684-12689 ◽  
Author(s):  
Mauro Moglianetti ◽  
John R. P. Webster ◽  
Steve Edmondson ◽  
Steven P. Armes ◽  
Simon Titmuss
Keyword(s):  
Polymer Brushes ◽  
Neutron Reflectivity ◽  
Water Interface ◽  
Ph Responsive ◽  
Responsive Polymer
Sign in / Sign up

Export Citation Format

Share Document