A “Holy Trinity” of Micellar Aggregates in Aqueous Solution at Ambient Temperature:  Unprecedented Self-Assembly Behavior from a Binary Mixture of a Neutral−Cationic Diblock Copolymer and an Anionic Polyelectrolyte

2003 ◽  
Vol 36 (26) ◽  
pp. 9994-9998 ◽  
Author(s):  
Jonathan V. M. Weaver ◽  
Steven P. Armes ◽  
Shiyong Liu
Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2028
Author(s):  
Po-Chih Yang ◽  
Yueh-Han Chien ◽  
Shih-Hsuan Tseng ◽  
Chia-Chung Lin ◽  
Kai-Yu Huang

This paper gathered studies on multistimulus-responsive sensing and self-assembly behavior of a novel amphiphilic diblock copolymer through a two-step reverse addition-fragmentation transfer (RAFT) polymerization technique. N-Isopropylacrylamide (NIPAM) macromolecular chain transfer agent and diblock copolymer (poly(NIPAM-b-Azo)) were discovered to have moderate thermal decomposition temperatures of 351.8 and 370.8 °C, respectively, indicating that their thermal stability was enhanced because of the azobenzene segments incorporated into the block copolymer. The diblock copolymer was determined to exhibit a lower critical solution temperature of 34.4 °C. Poly(NIPAM-b-Azo) demonstrated a higher photoisomerization rate constant (kt = 0.1295 s−1) than the Azo monomer did (kt = 0.088 s−1). When ultraviolet (UV) irradiation was applied, the intensity of fluorescence gradually increased, suggesting that UV irradiation enhanced the fluorescence of self-assembled cis-isomers of azobenzene. Morphological aggregates before and after UV irradiation are shown in scanning electron microscopy (SEM) and dynamic light scattering (DLS) analyses of the diblock copolymer. We employed photoluminescence titrations to reveal that the diblock copolymer was highly sensitive toward Ru3+ and Ba2+, as was indicated by the crown ether acting as a recognition moiety between azobenzene units. Micellar aggregates were formed in the polymer aqueous solution through dissolution; their mean diameters were approximately 205.8 and 364.6 nm at temperatures of 25.0 and 40.0 °C, respectively. Our findings contribute to research on photoresponsive and chemosensory polymer material developments.


2020 ◽  
Vol 11 (2) ◽  
pp. 396-402 ◽  
Author(s):  
Sarah J. Byard ◽  
Cate T. O'Brien ◽  
Matthew J. Derry ◽  
Mark Williams ◽  
Oleksandr O. Mykhaylyk ◽  
...  

A new amphiphilic diblock copolymer prepared via polymerization-induced self-assembly forms spheres, worms, vesicles or lamellae in aqueous solution on adjusting the temperature.


2017 ◽  
Vol 50 (18) ◽  
pp. 7155-7168 ◽  
Author(s):  
Evgeniia V. Konishcheva ◽  
Ulmas E. Zhumaev ◽  
Maximilian Kratt ◽  
Valentin Oehri ◽  
Wolfgang Meier

2017 ◽  
Vol 50 (4) ◽  
pp. 1482-1493 ◽  
Author(s):  
Sarah J. Byard ◽  
Mark Williams ◽  
Beulah E. McKenzie ◽  
Adam Blanazs ◽  
Steven P. Armes

2015 ◽  
Vol 51 (39) ◽  
pp. 8296-8299 ◽  
Author(s):  
Dawei Li ◽  
Yuguang Niu ◽  
Yanyu Yang ◽  
Xing Wang ◽  
Fei Yang ◽  
...  

We demonstrate a simple approach to prepare POSS-embedded hyperbranched amphiphiles, presenting morphological transition from micelle to vesicle in aqueous solution.


RSC Advances ◽  
2018 ◽  
Vol 8 (23) ◽  
pp. 12752-12759
Author(s):  
HuaQing Liang ◽  
QiHua Zhou ◽  
YongJiang Long ◽  
WanChu Wei ◽  
Shuo Feng ◽  
...  

Herein, a novel amphiphilic diblock copolymer consisting of isotactic polystyrene and 1,4-trans-polybutadiene-graft-poly(ethylene oxide) was synthesized and its self-assembly behavior was investigated.


Inorganics ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 91 ◽  
Author(s):  
Marta Gozzi ◽  
Benedikt Schwarze ◽  
Peter Coburger ◽  
Evamarie Hey-Hawkins

3,1,2-Ruthenadicarbadodecaborane complexes bearing the [C2B9H11]2− (dicarbollide) ligand are robust scaffolds, with exceptional thermal and chemical stability. Our previous work has shown that these complexes possess promising anti-tumor activities in vitro, and tend to form aggregates (or self-assemblies) in aqueous solutions. Here, we report on the synthesis and characterization of four ruthenium(II) complexes of the type [3-(η6-arene)-1,2-R2-3,1,2-RuC2B9H9], bearing either non-polar (R = Me (2–4)) or polar (R = CO2Me (7)) substituents at the cluster carbon atoms. The behavior in aqueous solution of complexes 2, 7 and the parent unsubstituted [3-(η6-p-cymene)-3,1,2-RuC2B9H11] (8) was investigated via UV-Vis spectroscopy, mass spectrometry and nanoparticle tracking analysis (NTA). All complexes showed spontaneous formation of self-assemblies (108–109 particles mL−1), at low micromolar concentration, with high polydispersity. For perspective applications in medicine, there is thus a strong need for further characterization of the spontaneous self-assembly behavior in aqueous solutions for the class of neutral metallacarboranes, with the ultimate scope of finding the optimal conditions for exploiting this self-assembling behavior for improved biological performance.


Nanoscale ◽  
2013 ◽  
Vol 5 (19) ◽  
pp. 9010 ◽  
Author(s):  
Xiaohan Wu ◽  
Suming Li ◽  
Fanny Coumes ◽  
Vincent Darcos ◽  
Joséphine Lai Kee Him ◽  
...  

2018 ◽  
Vol 34 (8) ◽  
pp. 945-951
Author(s):  
Xiaomeng CHENG ◽  
◽  
Dongxia JIAO ◽  
Zhihao LIANG ◽  
Jinjin WEI ◽  
...  

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