Dual-responsive recurrent self-assembly of a supramolecular polymer based on the host–guest complexation interaction between β-cyclodextrin and azobenzene
作者:Ping Shen、Liyan Qiu
DOI:10.1039/c7nj05042a
日期:——
isomerization of Azo, the supramolecular assemblies apparently show pH and photo responsive properties. Furthermore, the combination of the pH regulation and the irradiation of UV light or visible light induced the recurrent disassembly and reassembly of the supramolecularpolymer. This dual-responsive supramolecularpolymer has great prospects in various practical applications such as intelligent nanomaterials
在这项工作中,我们报告了一种基于超分子聚合物,其基于β-CD-PEG中的β-环糊精基团与PAE - g-偶氮中的偶氮苯基之间的主体-客体相互作用。超分子聚合物PAE- g -Azo @β-CD-PEG由于其适当的两亲性,可以在水溶液中自组装成规则的纳米结构。从PAE的pH响应性和光响应惠民反式-到-顺异构化的偶氮,超分子组装显然显示出pH值和光响应特性。此外,pH调节和UV光或可见光辐射的组合引起超分子聚合物的反复分解和重新组装。这种双反应性超分子聚合物在各种实际应用中具有广阔的前景,例如智能纳米材料和纳米技术。
Synthesis and photosensitivity of azobenzene functionalized hydroxypropylcellulose
作者:Yizhong Huang、Hongliang Kang、Guanghua Li、Chunying Wang、Yong Huang、Ruigang Liu
DOI:10.1039/c3ra43031f
日期:——
Azobenzene functionalized hydroxypropyl cellulose derivatives (azo-HPCs) with different degrees of substitution with azobenzene moieties were synthesized and characterized. The degree of substitution with the azobenzene moieties (DSazo) can be adjusted by changing the feed ratio in the reaction mixture. The photosensitivity of the azo-HPCs in both solution and solution film was investigated. The azobenzene moieties of the azo-HPCs exhibited a reversible cis-to-trans isomerization transition upon irradiation with UV and visible light in both solution and the solid state. The reversible trans-to-cis photoisomerization led to a change of the wettability of the azo-HPC films. Surface energy estimations suggest that the tunable film wettability was attributed to the change of the dipole moment of the azobenzene moieties in the film surface. The variation of the contact angle depends on the DSazo of the azo-HPC derivatives. A higher DSazo corresponds to a larger variation of water contact angle upon UV irradiation under the same conditions. This work offers a versatile method to manipulate the surface properties of the eco-friendly cellulose derivatives.
A dual stimuli-responsive multi-drug delivery system was developed for “cancer cocktail therapy”. Release behaviors of the dual drugs could be controlled separately by appropriate stimulation.
and N-4-azodiphenyl-succinic acid (ADPSA) bearing azobenzene and carboxylic acid segments. In the process of deprotonation/protonation of the carboxylic acids by pH variation, the self-assembly of these two gelators was triggered. ADPMA could transform from solution to hydrogel while the solution of ADPSA formed a precipitate under the same conditions. The solution-gel/precipitate transformation can