Novel evaluation method of neutron reflectivity data applied to stimulus-responsive polymer brushes

Soft Matter ◽  
2008 ◽  
Vol 4 (3) ◽  
pp. 500 ◽  
Author(s):  
Jianming Zhang ◽  
Tommy Nylander ◽  
Richard A. Campbell ◽  
Adrian R. Rennie ◽  
Stefan Zauscher ◽  
...  
Keyword(s):  
Polymer Brushes ◽  
Evaluation Method ◽  
Neutron Reflectivity ◽  
Stimulus Responsive ◽  
Responsive Polymer ◽  
Reflectivity Data

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).

Micro-cantilevers with end-grafted stimulus-responsive polymer brushes for actuation and sensing

2006 ◽  
Vol 114 (1) ◽  
pp. 371-378 ◽  
Author(s):  
Nehal I. Abu-Lail ◽  
Marian Kaholek ◽  
Bruce LaMattina ◽  
Robert L. Clark ◽  
Stefan Zauscher
Keyword(s):  
Polymer Brushes ◽  
Stimulus Responsive ◽  
Responsive Polymer

Polymerization, Nanopatterning and Characterization of Surface-Confined, Stimulus-Responsive Polymer Brushes

2005 ◽  
pp. 381-402
Author(s):  
Marian Kaholek ◽  
Woo-kyung Lee ◽  
Bruce LaMattina ◽  
Kenneth C. Caster ◽  
Stefan Zauscher
Keyword(s):  
Polymer Brushes ◽  
Stimulus Responsive ◽  
Responsive Polymer

Stimulus-responsive polymer brushes on surfaces: Transduction mechanisms and applications

2010 ◽  
Vol 35 (1-2) ◽  
pp. 94-112 ◽  
Author(s):  
Tao Chen ◽  
Robert Ferris ◽  
Jianming Zhang ◽  
Robert Ducker ◽  
Stefan Zauscher
Keyword(s):  
Polymer Brushes ◽  
Stimulus Responsive ◽  
Responsive Polymer ◽  
Transduction Mechanisms

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

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).

Fabrication of Stimulus-Responsive Polymeric Nanostructures by Proximal Probes

2002 ◽  
Vol 735 ◽  
Author(s):  
Sang-Jung Ahn ◽  
Woo-Kjung Lee ◽  
Stefan Zauscher
Keyword(s):  
Free Radical ◽  
Radical Polymerization ◽  
Polymer Brushes ◽  
Polymer Brush ◽  
Free Radical Polymerization ◽  
Surface Initiated Polymerization ◽  
Stimulus Responsive ◽  
Responsive Polymer ◽  
Assembled Monolayers ◽  
Detection Of Biomolecules

ABSTRACTThe triggered control of interfacial properties on the nanometer scale holds significant promise for actuation in bio-nanotechnology applications where polymeric actuators may manipulate the transport, separation, and detection of biomolecules. To fabricate patterned, stimulus-responsive polymer brushes we have developed several methods that combine surface initiated polymerization (SIP) with dip-pen nanolithography (DPN). Surface-confined, stimulus-responsive polymer brush nanopatterns were fabricated by amplification of DPN patterned, self-assembled monolayers of 16-mercaptohexadecanoic acid on gold surfaces by SIP of N-isopropylacrylamide (NIPAAm). While free radical polymerization yielded only short polymer brushes (DP<50), atom transfer free radical polymerization (ATRP) produced thick, uniform polymer brushes. For free radical polymerization the thickness of the polymer brush layer is a function of the lateral feature size and the initiator density and is maximal at pattern boundaries.

Immobilization of Silver Nanoparticles on Responsive Polymer Brushes

2008 ◽  
Vol 41 (8) ◽  
pp. 2874-2879 ◽  
Author(s):  
Smrati Gupta ◽  
Petra Uhlmann ◽  
Mukesh Agrawal ◽  
Severine Chapuis ◽  
Ulrich Oertel ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Polymer Brushes ◽  
Responsive Polymer
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