CO<sub>2</sub>‐Responsive Polymeric Vesicles that Breathe

Yan, Qiang; Zhou, Rong; Fu, Changkui; Zhang, Huijuan; Yin, Yingwu; Yuan, Jinying

doi:10.1002/anie.201100708

Cited by 285 publications

(253 citation statements)

References 64 publications

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“…Thev esicles were formed by the self-assembly of an amphiphilic diblock copolymer consisting of hydrophilic poly(ethylene oxide) (PEO) and CO 2 -sensitive poly(N-amidino)dodecyl acrylamide (PAD). [9] Another type of CO 2 -responsive polymer containing amine groups,s uch as poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) and poly(N,N-diethylaminoethyl methacrylate) (PDEAE-MA), have been reported by Zhao et al [10] Thet ertiary amine groups in PDEAEMA can react with CO 2 in water, exhibiting an extended hydrophilic chain conformation. [11] Upon exposure to N 2 to remove CO 2 ,i tr ecovers its hydrophobic aggregate state.T hese exciting results prompted us to select the CO 2 -sensitive polymers for the gas-controlled surface wettability study.…”

Section: Dedicated To Professor Xinde Feng On the Occasion Of His 100mentioning

confidence: 98%

CO₂‐Responsive Nanofibrous Membranes with Switchable Oil/Water Wettability

et al. 2015

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Responsive polymer interfacial materials are ideal candidates for controlling surface wetting behavior.H ere we developed smart nanostructured electrospun polymer membranes whicha re capable of switching oil/water wettability using CO 2 as the trigger.Inparticular,the combination of CO 2 -responsiveness and porous nanostructure enables the asprepared membranes to be used as an ovel oil/water on-off switch.W ea nticipate that the promising versatility and simplicity of this system would not only open up an ew way of surface wettability change regulation by gas,b ut also have obvious advantages in terms of highly controlled oil/water separation and CO 2 applications.

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Section: Dedicated To Professor Xinde Feng On the Occasion Of His 100mentioning

confidence: 98%

CO₂‐Responsive Nanofibrous Membranes with Switchable Oil/Water Wettability

et al. 2015

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“…As an inexpensive, non-toxic, biocompatible and benign stimulus, carbon dioxide has been found to be able to switch properties of some emulsifiers, 29 solvents, 30 polymers [31][32][33][34] and initiators, 35 which bear carbon dioxide-sensitive moieties including amidine, guanidine or amine, and allow reversible reaction with carbon dioxide in water to form cationic adducts. While carbon dioxide essentially acts on the pH, it offers advantages over the latter as a trigger, in avoiding contamination and accumulation in the system.…”

Section: Introductionmentioning

confidence: 99%

CO₂-responsive anionic wormlike micelles based on natural erucic acid

2014

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Research interests highlighted in recent years a remarkable growing focus on stimuli-responsive surfactant wormlike micelles, particularly those using carbon dioxide as the trigger. In this article, we report a novel carbon dioxideresponsive wormlike micellar system based on natural erucic fatty acid and examined its solution properties through rheology, Fourier transform infrared spectroscopy and cryo-tranmission electron microscopy. When carbon dioxide is introduced into the erucic acid solution, high-viscelastic wormlike micelles shift to low-viscosity solutions in short-time scale, accompanied by decrease in pH from 11·34 to 8·90, which is accounted for the effect of pH on the existence form of erucic acid in aqueous solutions. Bubbling nitrogen under heating cannot make a converse process since the viscoelastic worms can only be obtained at a high pH. Compared with other carbon dioxide-responsive wormlike micelles, the current one is more readily obtained and more environment-friendly because it can be formed by simply changing pH value of the natural erucic acid solutions without needing complex organic synthesis or addition of hydrotropes. IntroductionStimuli-responsive materials whose properties respond remarkably on minor environmental change have attracted much attention in the last decade.1-3 Among all such materials, colloids and micelles represent important soft matters and play crucial roles in various industrial applications.2 Different micellar morphologies can be obtained by self-assembly of amphiphilic compounds such as surfactants or block copolymers. 4 One of such fascinating morphological aggregates is the wormlike or threadlike micelles. Above a critical overlapping concentration (C*), the wormlike micelles entangle into a dynamic 3D transient network reminiscent of polymer solutions to display remarkable macroscopic viscoelastic properties. However, unlike the polymer entanglements, they break and recombine in a dynamic process, and are thus called 'living' or 'equilibrium' polymers. 5,6 Because of their unique micellar structures and rheological response, 7,8 viscoelastic fluids based on wormlike micelles have been a key focus of research in soft matter from both theoreticians and experimentalists for fundamental studies as well as industry applications, including rheology control, 8

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“…It was confi rmed by much larger intact vesicles with a diameter of 205.25 nm and strikingly increases volume by 83.5 % after CO 2 treatment for 20 min. These vesicles shrunk back to their initial size in the presence of Ar [ 101 ].…”

Section: Breathing Vesiclesmentioning

confidence: 94%