RSC Advances
·
2018
·Vol. 8
·期 29
·16103-16113
·
IF 2.936
Yiting Xu,Jie Cao,Qi Li,Jilu Li,Kaiwei He,Tong Shen,Xinyu Liu,Conghui Yuan,Birong Zeng,Lizong Dai
A series of novel azobenzene-based amphiphilic random copolymers P(POSSMA-co-AZOMA-co-DMAEMA) were synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. A light and reduction dual-responsive azo group, pH-responsive tertiary amine group and super hydrophobic POSS moiety were incorporated into the polymer chain to generate multi-stimuli-responsiveness. Self-assembly of these amphiphilic copolymers led to the formation of spherical micelles in aqueous solution. The light, pH and reduction responsive properties of the micelles were investigated systematically by DLS, TEM, UV-vis, FTIR and NMR. The azo groups can undergo trans–cis isomerization under UV light irradiation, thus causing a diameter change of the micelles. Owing to the large proportion of tertiary amine groups in amphiphiles, these micelles showed sensitive pH-response behavior. The hydrophobic azo pendant in the polymer chain completely reduced to a more hydrophilic substituted aniline in a reductive environment, resulting in the increase of overall hydrophilicity of amphiphiles and the disassembly of polymeric micelles. Owing to these multi-stimuli–responses, the polymeric micelles showed rapid and efficient release properties of hydrophobic molecules in response to pH and reductive stimuli.
研究领域:
材料科学
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高分子化学
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纳米医学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
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2012
·
IF 0.633
Yan Gao,Jian Song,Wei Wang
Four novel azobenzene derivatives, 4,4'-bis(CH2SAr)azobenzene (Ar = different heterocyclic units), have been prepared and characterised by IR, 1H NMR, 13C NMR, MS and elemental analysis. Their complexation properties to different heavy and transition metal ions have been studied by UV and fluorescence spectra. The compound 4,4'-bis(4,6-dimethyl-pyrimidine-2-ylmethylthio)azobenzene shows selective recognition of Hg2+.
研究领域:
化学
·
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Qingqing Yang,Jinye Wang,Liping Huang,Wei Song,Liang Ding
The properties of synthetic polymers are influenced by the connection mode of polymer chains even polymers made from the same monomer. In this work, the diverse composition systems of cyclooctene-based alternating, random and block azo-copolymers containing imidazolium cation units as side group were successfully achieved based on different metathesis methods in the ionic liquid with good control over the polymerization processes. All these ionic azo-copolymers were tailored to explore the effects of monomers sequences and non-covalent interactions on photoresponsive behaviors and self-assembly morphologies. Since the special alternating structure, UV-light-triggered the shackling trans → cis photoisomerization transition was observed, ultimately spontaneously forming highly regular and uniform polymer vesicle with recoverable size variation in THF directly. Differently, the micellar characterization was carried out by the self-assembly of ionic block azo-copolymers in a selective solvent of toluene to obtain spherical micelle with reversible shape evolution considering nearly 86 % trans→cis relative isomerization efficiency. These interesting results not only demonstrate the diversity of metathesis polymerization but also expand the property of azo-copolymers.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2019
·Vol. 10
·期 22
·2872-2880
·
IF 4.76
Jiawei Yu,Kun Li,Lishan Li,Lei Liu,Yechun zhou,Zhengbiao Zhang,Mingyu Guo,Nianchen Zhou,Xiulin Zhu
Cyclic architectures of polymers have shown unique properties or improved performance owing to the lack of chain ends. Herein, we describe the first example of azobenzene-induced photoresponsive gels based on cyclic polymers fabricated using an azide–alkyne and boronic acid-diol “click” reaction. The properties of cyclic gels with different cyclic polymer sizes were investigated by comparing them with those of linear gels made using polymeric linear precursors. It was observed that the cyclic topology exerted a larger influence on the properties of the gels. Further significant influences exerted by the topology were observed in cyclic gels with a smaller cyclic polymer size. Rheological measurements revealed that the cyclic gels have a higher storage modulus (G′) and loss modulus (G′′) compared to their linear counterparts, indicating that the former is stiffer than the latter. The gel-to-sol transition and photo-healing of the gels induced by azobenzene were observed by irradiation with UV/Vis light. Nevertheless, the cyclic gel with a smaller cyclic polymer size demonstrated a poor photo-responsive behavior owing to the restrictions of transformation of the trans–cis isomer of azobenzene moieties imposed by the cyclic topology. The results in this work showed that the network mesh space, and intramolecular and intermolecular interactions induced by the macrocyclic architecture endow the functional cyclic gels with unique properties.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Guangbin Ji,Fei Yang,Yanzhao Yang,Jingjing Wei,Zhijie Yang
Hypothesis The ability to control the assembly of micro/nanosized particles at liquid-liquid interface with external inputs promises new opportunities in nanofabrication and biomedicines. This work aims to demonstrate a way to control of dynamic assembly of nanoparticles at liquid-liquid interface by light and magnetic field, which consequently enables the formation of dynamic emulsion droplets. Experiments Magnetic Fe 3 O 4 nanoparticles functionalized with azobenzene moieties (Fe 3 O 4 @AZO) were synthesized and were dispersed in toluene/(N, N -dimethylformamide, DMF) binary solvent. After irradiation with UV or visible light , the assembly behavior of these Fe 3 O 4 nanoparticles were evaluated by electron microscopy and fluorescent microscopy. Findings Under UV light , Fe 3 O 4 @AZO nanoparticles were self-assembled due to the increase of dipolar interaction from the photoisomerization of azobenzene and polar molecules , DMF, were harvested from a binary solvent of DMF/toluene. While under visible light, a relief of dipolar interactions between Fe 3 O 4 @AZO nanoparticles can induce the secondary assembly of these Fe 3 O 4 @AZO nanoparticles at DMF-toluene interface, resulting in DMF droplets covered by a layer of nanoparticle superlattices . More importantly, coupled with a magnetic field, these emulsion droplets can be shaped into one dimensional ones during the interfacial assembly process, thereby giving rise to dynamic emulsions controlled by light and magnetic field.
研究领域:
材料科学
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纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTIK
·
2013
·
IF 0.524
Zhijuan Cao,Fengxian Qiu,Qing Wang,Guorong Cao,Lin Zhuang,Qiang Shen,Xiaolong Xu,Jie Wang,Qian Chen,Dongya Yang
The azo benzothiazole polyurethane–urea (ABPUU) was synthesized from chromophore molecule 4-[(6-nitrobenzothiazole-2-yl)diazenyl]phenyl-1,3-diamine NBDPD, polyether polyol (NJ-210) and isophorone diisocyanate (IPDI). The structure, thermal property , mechanical property and physical property were characterized and investigated. The refractive index ( n ) and thermo-optic coefficient (d n /d T ) of ABPUU was determined at different temperature and wavelength (532 nm, 650 nm and 850 nm) using attenuated total reflection (ATR) technique. Using the CCD digital imaging devices, transmission loss of ABPUU was measured. A 1 × 2 Y-branched and 2 × 2 Mach–Zehnder interferometer (MZI) switch with two rib waveguides , dual driving electrodes and two critical 3-dB couplers polymeric thermo-optic switches based on thermo-optic effect of prepared ABPUU were designed and simulation. The power consumption of the Y-branched switch is less than 0.84 mW. The Y-branched and MZI switching rising and falling times obtained are 0.8 ms and 0.2 ms, respectively.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2019
·Vol. 10
·期 35
·4852-4858
·
IF 4.76
Manqing Xie,Chen Wu,Chongyi Chen,Ying Liu,Chuanzhuang Zhao
A novel shape memory hydrogel with photo-adaptable permanent shape has been developed on the basis of alginate–Ca2+ coordination and the host–guest interaction between α-cyclodextrin and azobenzene. The reversible nature of alginate–Ca2+ confers the hydrogel with functions such as shape memory and shape recovery, and the light-responsive transition of azobenzene could be applied to generate a new permanent shape by tuning the host–guest complexation via UV light.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
ChemPlusChem
·
2019
·Vol. 84
·期 4
·328-332
·
IF 3.441
Qiuhong Cheng,Yimeng Zhang,Tianxiang Luan,Zhuoer Wang,Ruipeng Tang,Pengyao Xing,Aiyou Hao
Graphical Surprisingly stable : Azobenzene derivatives bearing carboxylic acid units were investigated as hydrogelators. Upon deprotonation/protonation of the carboxylic acids, N -4-azodiphenyl-maleimic acid (ADPMA; see picture) could transform from solution to hydrogel. The ADPMA hydrogel shows typical trans-cis isomerization of the azobenzene unit in solution, yet the hydrogel demonstrates remarkable stability to UV light irradiation in both the bulk gel and thin film states. Azobenzene and its derivatives are widely used as photoresponsive units for the fabrication of photoresponsive smart materials. In this work, two azobenzene derivatives were designed and investigated as hydrogelators, namely N -4-azodiphenyl-maleimic acid (ADPMA) 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 be repeated by changing the pH. In contrast to the conventional responsiveness to UV-light irradiation for azobenzene-based gels, the ADPMA hydrogel shows typical trans - cis isomerization of the azobenzene unit in solution, yet the hydrogel demonstrates remarkable stability to UV light irradiation in both the bulk gel and thin film states.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2019
·
IF 3.782
Pang Juan,Gao Ziyu,Tan Huaping,Mao Xincheng,Wang Huiming,Hu Xiaohong
Azobenzene (AZO) has attracted increasing interest due to its reversible structural change upon a light stimulus. However, poor fatigue durability and the photobleaching phenomenon restricts its further application. Herein, the AZO domain as a pendent group, was incorporated into copolymers, which was synthesized by radical copolymerization in the research. Structure-properties of synthesized copolymer can be adjusted by monomer ratios. Emphatically, responsive properties of copolymer in different solutions were investigated. In the DMSO solution, copolymer exhibited effective structural change, stable rapid responsive time (1 min) upon UV light at room temperature, stable relative acceptable recovery time (100 min) upon white light at room temperature, and good fatigue resistance property. In an aqueous solution, even more controllable responsive properties and fatigue resistance properties for copolymer were verified by results. More pervasively, the recovery process could be controlled by light density and temperature. In order to clarify reasons for the difference between the AZO molecule and the AZO domain of copolymer, energy barrier or interactions between single atoms or even structural units was calculated using the density functional theory (DFT). Furthermore, the status of copolymer was characterized by dynamic light scattering (DLS) and transmission electron microscope (TEM). Finally, copolymer was further functionalized with bioactive protein (concanavalin, ConA) to reduce the cytotoxicity of the AZO molecule.
研究领域:
材料科学
·
化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Haibo Zhang,Wanbing Li,He Liu,Shibin Shang,Zhanqian Song
Azobenzene-based liquid crystalline elastomers with dynamic ester bonds exhibit high thermal- and photo-responsive properties. However, there are a few studies that focus on photo-induced and thermal-induced behaviors separately. Herein, novel thermal- and photo-responsive LCEs containing dynamic ester bonds were prepared from 4,4’-diglycidyloxy-azobenzene, sebacic acid and tung oil-based azobenzene, which acted as a side chain. The dynamic transesterification reactions on the network structure were confirmed through stress relaxation. The photo-induced and thermal-induced behaviors were also investigated. The monodomain LCEs film was obtained by uniaxial stretching at a temperature above the smectic–isotropic phase transition temperature ( T i ∼82 °C). Due to the breakage and formation of dynamic ester bonds and the order-disorder smectic phase transition caused by heat and the trans-cis isomerization of azobenzene mesogens, the thermal-induced stress of the monodomain LCEs film reached ∼3 MPa. The LCEs film also exhibited thermal-induced shape-memory properties. Investigation of its photo-responsive behavior further demonstrated that the monodomain LCEs film generated stress of ∼1.1 MPa while exhibited photo-induced deformation due to the trans-cis isomerization of azobenzene mesogens upon irradiation with 365 nm UV light. Finally, we observed that the monodomain LCEs film could undergo quickly photo-induced deformation and could be processed into a photo-driven gripper.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2018
·
IF 1.946
Amin Khan,Li Wang,Haojie Yu,Muhammad Haroon,Raja Summe Ullah,Ahsan Nazir,Tarig Elshaarani,Muhammad Usman,Shah Fahad,Kaleem-ur-Rehman Naveed
Three novel polymers (P(FHEMA- co -MAAT)s) having redox and photoresponsive moieties were prepared by free radical polymerization . The structures and molecular weights of the synthesized copolymers were characterized by nuclear magnetic resonance ( 1 H NMR) and gel permeation chromatography (GPC) respectively. Thermal properties, optical features and electroactive properties were studied with the help of thermogravimetric (TG), differential thermogravimetric (DTG) analysis, ultraviolet-visible spectroscopy (UV-vis) and cyclic voltammetry (CV). It was seen that synthesized copolymers had excellent redox and photoresponsive properties. These results exhibited that these polymers can be applied further for redox/photo responsive information storage devices.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2020
·
IF 2.908
Duo Wang,Ruo-Yan Li,Yuan-Yuan Quan,Qing-Qing He,Mei Tian,Dan-Shu Yao
Twenty novel azobenzene liquid crystal micromolecular compounds named ω-[4-(p-substituted azobenzeneoxy carbonyl]acid (X-ABCnA) have been designed and synthesised, followed by studies on the thermal performance and mesomorphic properties of the compounds. The liquid crystal compounds were divided into five homologous series based on the terminal substituents R (R = CH3O, CH3, H, Cl, NO2). In each series, the number of carbons on flexible chain was 4, 6, 8 and 10, respectively. Fourier-transform infrared, proton nuclear magnetic resonance and elementary analysis demonstrated that the structure of the synthesised azobenzene liquid crystal compounds was consistent with the molecular design. The mesomorphic properties were tested, analysed and characterised by using differential scanning calorimetry and polarised optical microscopy. The melting transition (Tm) of all the compounds in homologous series with different substituents appeared to decrease with the increase of carbon numbers on flexible chains. The same held true for the temperature of isotropic-mesophase/crystalline transition. The compounds with stronger polarity of terminal substituents were more likely to form broader mesogenic ranges. The liquid crystal compounds discussed in this work can be regarded as a reference for the synthesis of mesogenic arms participating in the synthesis of novel multi-arm liquid crystalline macromolecules and polymers.
研究领域:
材料科学
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
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