Aggregation and Self-Assembly of Amphiphilic Block Copolymers in Aqueous Dispersions of Carbon Nanotubes

Langmuir ◽  
2008 ◽  
Vol 24 (9) ◽  
pp. 4625-4632 ◽  
Author(s):  
Rina Shvartzman-Cohen ◽  
Marc Florent ◽  
Daniella Goldfarb ◽  
Igal Szleifer ◽  
Rachel Yerushalmi-Rozen
Keyword(s):  
Carbon Nanotubes ◽  
Block Copolymers ◽  
Self Assembly ◽  
Amphiphilic Block Copolymers ◽  
Aqueous Dispersions

scholarly journals Diameter of Carbon Nanotube-Directed Self-Assembly of Amphiphilic Block Copolymers

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1606 ◽  
Author(s):  
Zihao Wang ◽  
Susu Tao ◽  
Yanyan Chu ◽  
Xiaoyan Xu ◽  
Qinggang Tan
Keyword(s):  
Carbon Nanotubes ◽  
Block Copolymer ◽  
Block Copolymers ◽  
Self Assembly ◽  
Supramolecular Structures ◽  
The Self ◽  
Amphiphilic Block Copolymers ◽  
Core Shell ◽  
Nanoparticle Interactions ◽  
Nanocomposite Structures

The cooperative self-assembly of nanoparticles and amphiphilic block copolymers has attracted increasing interests as it offers effective routes to achieve nanocomposite supramolecular structures with desired structure and properties. The incorporation of nanoparticles usually tunes the self-assembly structure of block copolymers, as the copolymer–nanoparticle interactions may change the relative volume ratio of hydrophobic block/hydrophilic block copolymers. It should be noted that the micro-size length and the strong nonpolar feature of carbon nanotubes (CNTs) may cause the block copolymer–CNT interactions to differ from the the block copolymer–nanoparticle interactions. Herein, we show that the diameter of CNTs and the copolymer/CNT ratio have a profound effect on the self-assembly behavior of amphiphilic block copolymers. Upon the addition of carboxylated multi-walled carbon nanotubes (c-MWCNTs, diameter <8 nm,) to the methoxy polyethylene glycol-poly (D,L-lactic acid) (MPEG-PDLLA) solution, it is difficult to observe the c-MWCNTs directly in TEM images. However, it has been found that they form supramolecular nanocomposite structures with MPEG-PDLLA. Moreover, these supramolecular structures transform from core–shell spherical micelles into rod-like micelles and then into large composite aggregates with the increase of the c-MWCNT addition. However, in the case of the addition of c-MWCNTs with a diameter of 30–50 nm, the dispersed c-MWCNTs and spherical core–shell micelles could be observed simultaneously in the TEM images at a low c-MWCNT addition, and then the micelle structure disappeared and only well-dispersed c-MWNTs were observed in TEM images at a high c-MWCNT addition. A possible model was proposed to explain the rule of CNTs participating in the formation of copolymer/CNT nanocomposite structures. It was also shown that as-prepared copolymer/CNT supramolecular nanocomposites could be used as drug carriers, enabling the adjustment of the drug loading and release time.

scholarly journals Polymerisation-induced self-assembly (PISA) as a straightforward formulation strategy for stimuli-responsive drug delivery systems and biomaterials: recent advances

2021 ◽  
Vol 9 (1) ◽  
pp. 38-50
Author(s):  
Hien Phan ◽  
Vincenzo Taresco ◽  
Jacques Penelle ◽  
Benoit Couturaud
Keyword(s):  
Drug Delivery ◽  
Block Copolymers ◽  
Drug Release ◽  
Self Assembly ◽  
Drug Delivery Systems ◽  
Amphiphilic Block Copolymers ◽  
Stimuli Responsive ◽  
Site Specific ◽  
On Demand ◽  
Redox Agents

Stimuli-responsive amphiphilic block copolymers obtained by PISA have emerged as promising nanocarriers for enhancing site-specific and on-demand drug release in response to a range of stimuli such as pH, redox agents, light or temperature.

Novel fluorescent amphiphilic block copolymers: Controllable morphologies and size by self-assembly

2007 ◽  
Vol 43 (7) ◽  
pp. 2891-2900 ◽  
Author(s):  
Xiaoju Lu ◽  
Shuling Gong ◽  
Lingzhi Meng ◽  
Cheng Li ◽  
Feng Liang ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Amphiphilic Block Copolymers

Synthesis and self-assembly of photoacid-containing block copolymers based on 1-naphthol

2019 ◽  
Vol 10 (41) ◽  
pp. 5602-5616 ◽  
Author(s):  
Felix Wendler ◽  
Jessica C. Tom ◽  
Felix H. Schacher
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Molecular Switches ◽  
Amphiphilic Block Copolymers ◽  
Strong Increase ◽  
Stimuli Responsive ◽  
Responsive Materials

Photoacids experience a strong increase in acidity when absorbing light and, hence, can be considered as molecular switches. The incorporation into amphiphilic block copolymers leads to novel stimuli-responsive materials with great potential.

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