Design of Stimuli-Responsive Surfaces Prepared by Surface Segregation of Polypeptide-b-polystyrene Diblock Copolymers

2008 ◽  
Vol 41 (4) ◽  
pp. 1053-1056 ◽  
Author(s):  
A. Bousquet ◽  
E. Ibarboure ◽  
C. Drummond ◽  
C. Labrugère ◽  
E. Papon ◽  
...  
Keyword(s):  
Surface Segregation ◽  
Diblock Copolymers ◽  
Stimuli Responsive ◽  
Responsive Surfaces

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).

Stimuli-Responsive Surfaces for Tunable and Reversible Control of Wettability

2015 ◽  
Vol 27 (27) ◽  
pp. 4062-4068 ◽  
Author(s):  
Xu Huang ◽  
Yajuan Sun ◽  
Siowling Soh
Keyword(s):  
Stimuli Responsive ◽  
Responsive Surfaces

From multi-responsive tri- and diblock copolymers to diblock-copolymer-decorated gold nanoparticles: the effect of architecture on micellization behaviors in aqueous solutions

Soft Matter ◽  
2015 ◽  
Vol 11 (24) ◽  
pp. 4830-4839 ◽  
Author(s):  
Lichun Song ◽  
Hui Sun ◽  
Xiaolu Chen ◽  
Xia Han ◽  
Honglai Liu
Keyword(s):  
Gold Nanoparticles ◽  
Aqueous Solutions ◽  
Diblock Copolymer ◽  
Triblock Copolymer ◽  
Diblock Copolymers ◽  
Stimuli Responsive ◽  
Aba Triblock Copolymer

This work reports on the aqueous stimuli-responsive behaviors of an ABA triblock copolymer, a BAB triblock copolymer, an AB diblock copolymer and citrate-based gold nanoparticles decorated with AB diblock copolymers.

scholarly journals Light-enabled reversible self-assembly and tunable optical properties of stable hairy nanoparticles

2018 ◽  
Vol 115 (7) ◽  
pp. E1391-E1400 ◽  
Author(s):  
Yihuang Chen ◽  
Zewei Wang ◽  
Yanjie He ◽  
Young Jun Yoon ◽  
Jaehan Jung ◽  
...  
Keyword(s):  
Optical Properties ◽  
Self Assembly ◽  
Diblock Copolymers ◽  
Solvent Polarity ◽  
Stimuli Responsive ◽  
Reversible Transformation ◽  
Potential Applications ◽  
Fundamental Research ◽  
Tunable Optical Properties ◽  
Ph Sensitive Polymer

The ability to dynamically organize functional nanoparticles (NPs) via the use of environmental triggers (temperature, pH, light, or solvent polarity) opens up important perspectives for rapid and convenient construction of a rich variety of complex assemblies and materials with new structures and functionalities. Here, we report an unconventional strategy for crafting stable hairy NPs with light-enabled reversible and reliable self-assembly and tunable optical properties. Central to our strategy is to judiciously design amphiphilic star-like diblock copolymers comprising inner hydrophilic blocks and outer hydrophobic photoresponsive blocks as nanoreactors to direct the synthesis of monodisperse plasmonic NPs intimately and permanently capped with photoresponsive polymers. The size and shape of hairy NPs can be precisely tailored by modulating the length of inner hydrophilic block of star-like diblock copolymers. The perpetual anchoring of photoresponsive polymers on the NP surface renders the attractive feature of self-assembly and disassembly of NPs on demand using light of different wavelengths, as revealed by tunable surface plasmon resonance absorption of NPs and the reversible transformation of NPs between their dispersed and aggregated states. The dye encapsulation/release studies manifested that such photoresponsive NPs may be exploited as smart guest molecule nanocarriers. By extension, the star-like block copolymer strategy enables the crafting of a family of stable stimuli-responsive NPs (e.g., temperature- or pH-sensitive polymer-capped magnetic, ferroelectric, upconversion, or semiconducting NPs) and their assemblies for fundamental research in self-assembly and crystallization kinetics of NPs as well as potential applications in optics, optoelectronics, magnetic technologies, sensory materials and devices, catalysis, nanotechnology, and biotechnology.

Stimuli-Responsive Surfaces for Biomedical Applications

2013 ◽  
pp. 63-87 ◽  
Author(s):  
Rui R. Costa ◽  
Natália M. Alves ◽  
J. Carlos Rodríguez-Cabello ◽  
João F. Mano
Keyword(s):  
Biomedical Applications ◽  
Stimuli Responsive ◽  
Responsive Surfaces

Dual CO2/temperature-responsive diblock copolymers confer controlled reversible emulsion behavior

2019 ◽  
Vol 10 (21) ◽  
pp. 2641-2646 ◽  
Author(s):  
Yeong-Tarng Shieh ◽  
Pei-Yu Tai ◽  
Chih-Chia Cheng
Keyword(s):  
Diblock Copolymers ◽  
Temperature Sensitive ◽  
Stimuli Responsive ◽  
Temperature Responsive

Dual-stimuli responsive diblock copolymers possessing unique temperature-sensitive and CO2/N2-switching ability were successfully developed to promote efficient manipulation of reversible emulsification processes.

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