COLLOID AND POLYMER SCIENCE
·
2015
·Vol. 293
·期 9
·2617-2624
·
IF 1.865
Yan Zhihu,Dai Caili,Zhao Mingwei,Zhao Guang,Li Yuyang,Wu Xuepeng,Liu Yifei,Du Mingyong
Dual-stimulated wormlike micelles regulated by pH and temperature in a surface active ionic liquid system comprising of a cationic surfactant ( N -cetyl- N -methylpyrrolidinium bromide (C 16 MDB)) and an aromatic dibasic acid (pyrocatechol) were investigated. Such a system can be reversibly switched between liquid-like and gel-like states on adjusting the solution pH value. The rheology, light scattering techniques and cryogenic-transmission electron microscopy (cryo-TEM) results show the growth of spherical micelles into long and entangled wormlike micelles was responsible for the changes in flow properties such as high viscosity, shear-thinning behaviour and Maxwell-type dynamic rheology. The nuclear magnetic resonance results reveal the binding capacity of pyrocatechol to C 16 MDB is proposed as the key factor of the unusual rheological and micellar responses of this pH-stimulated system. In addition, with the increase of temperature, molecular motion of surfactant molecules becomes more active, which endow the property of thermo-stimulated to the surface active ionic liquid system.
研究领域:
化学
·
材料科学
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 36
·10646-10654
·
IF 0
Wei Sun,Shuxue Zhou,Bo You,Limin Wu
This paper presents the first fabrication of smart films with unique reversible double-stimulus responsive wettability. In this method, the ABC-type triblock copolymers synthesized through the sequential living radical polymerizations of 2-(diisopropylamino)ethyl methacrylate (DPAEMA), 2-hydroxyethyl methacrylate (HEMA), and (4-(2-methylacryloyloxy) ethyloxy-4′-trifluoromethoxy) azobenzene (MAAZO) mediated by a reversible addition–fragmentation chain transfer (RAFT) process, were grafted onto the surfaces of SiO2 films through the reactions between the hydroxyl groups of the PHEMA middle segments and the acyl chloride groups of the SiO2 film surfaces to form specific V-shaped polymer brushes, leaving highly free PDPAEMA and PMAAZO chains. The as-obtained V-shaped polymer brush-functionalized film exhibited a peculiar reversible double-stimulus responsive wettability, which was triggered only by the joint action of pH and UV light irradiation rather than either single stimulus. This unique wettability should be attributed to the changes of the chemical state of functional groups and the distribution of surface polymer brushes under different stimuli.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 33
·17098-17105
·
IF 7.443
Long Yang,Yinzhou Guo,Zhongli Lei
We report on the double stimuli-responsive self-assembly of a Janus-like supramolecular polymer based on the host–guest chemistry. It is constructed by the noncovalent coupling between a hyperbranched PMAA with an apex of an adamantane (Ad) group and a hyperbranched PNIPAAm with an apex of a β-cyclodextrin (β-CD) group. Upon adjusting the solution pH or temperature, the supramolecular polymer can reversibly self-assemble in solution.
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2017
·
IF 5.835
Yan Wang,Ming-Zhe Lv,Nan Song,Zeng-Jie Liu,Chunyu Wang,Ying-Wei Yang
We report a new strategy to construct a multi-stimuli-responsive fluorescent supramolecular polymer by the strong host–guest interactions between a diselenium bond-bridged pillar[5]arene dimer and an AIE-active tetraphenylethylene (TPE)-containing neutral guest bearing two imidazole terminal binding sites. The resulting supramolecular polymer shows a remarkable fluorescence emission decrease at low concentration. Significantly, the diselenium bonds introduced into the supramolecular polymer serve as redox-responsive building blocks. Upon addition of reductants, the supramolecular polymer depolymerized owing to the cleavage of the covalent diselenium bonds in the system. On the other hand, competitive guests such as adiponitrile, which bind strongly with pillar[5]arenes, could lead the disassembly of the polymer to oligomers without breaking any covalent bonds in the system. These two types of depolymerization approaches can both result in the fluorescence intensity recovery of the system to a certain extent, which will hopefully enrich the methodology toward the construction of smart supramolecular polymeric materials with different properties.
研究领域:
超分子化学
·
材料科学
·
有机化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yiying Yue,Huiming Luo,Jingquan Han,Yiliang Chen,Jianchun Jiang
The incorporation of renewable bio-based materials/eco-friendly inorganic nanofillers into stimuli-responsive hydrogels meets the need for biocompatible and non-toxic functional materials. However, it remains challenging to build a three-dimensional network with enhanced mechanical properties and desired stimuli-responsive performances. In this study, dual stimuli-responsive hydrogels with interpenetrating polymer network structure are fabricated by the crosslinking of N-isopropylacrylamide (NIPAM) 1 and sodium alginate (SA) 2 . 2,2,6,6-tetramethyl-piperidine-1-oxyl-oxidized cellulose nanofibers (TOCNF) 3 derived from energycane bagasse serves as a carrier material for nanosilicas (NS) 4 and nanoclays (NC) 5 and the effects of TOCNF , TOCNF/NS and TOCNF/NC on the hydrogels are thoroughly explored. Among these hydrogels, PNIPAM/SA-TOCNF-NS possesses the largest compressive strength of 66.7 kPa and it is 5.65 times higher than that of PNIPAM/SA. The thermo-sensitivity and pH-sensitivity of hydrogels are evidenced by swelling behaviors, optical properties, contact angle measurements and fluorescence tests. PNIPAM/SA-TOCNF exhibits the largest contact angle and the swelling processes for all the hydrogels are well fitted by pseudo-second-order swelling kinetic model. In addition, after incorporating carbon quantum dots, all the hydrogels display temperature dependent on–off fluorescence properties and this process are fully reversible with the heating and cooling cycles. These novel hydrogels with pH and temperature responsive characteristics and remarkable mechanical properties will open the door for interesting applications in smart sensors etc.
研究领域:
材料科学
·
生物工程
·
化学工程
✓ 已验证
DOI
高影响因子
Small
·
2015
·Vol. 11
·期 31
·3807-3813
·
IF 8.368
Li-Li Tan,Haiwei Li,Yue Zhou,Yuanyuan Zhang,Xiao Feng,Bo Wang,Ying-Wei Yang
A new theranostic nanoplatform, comprising of monodisperse zirconium metal-organic frameworks (MOFs) as drug carriers and carboxylatopillar[5]arene-based supramolecular switches as gating entities, is constructed, and controlled drug release triggered by bio-friendly Zn 2+ ions (abundant in synaptic vesicles) and auxiliary thermal stimulus is realized. This on-command drug delivery system exhibits large pore sizes for drug encapsulation, excellent biodegradability and biocompatibility, extremely low cytotoxicity and premature drug release, and superior dual-stimuli responsiveness, opening a new avenue in targeted drug delivery and controlled release of therapeutic agents, especially in the treatment of central nervous system diseases.
研究领域:
材料科学
·
生物医学工程
·
药学
✓ 已验证
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Mengmeng Xia,Fu Zhou,Xiuyun Feng,Jiahui Sun,Li Wang,Na Li,Xiayan Wang,Guangfeng Wang
An effective and precise electrochemiluminescence resonance energy transfer (ECL-RET), including the efficient regulation over the proximity of a donor and an acceptor and the reliable stimuli responsive as well as the avoidance of undesirable probes leakage, etc., is significant for the development of an accurate and sensitive ECL detection method; yet, the current literature in documentation involves only a limited range of such ECL-RET systems. Herein, we propose an ECL-RET strategy with dually quenched ultralow background signals and a dual-stimuli responsive, accurate signal output for the ultrasensitive and reliable detection of anatoxin-a (ATX-a). The dual quenching is accomplished by an integrated ECL-RET probe of metal organic frameworks (MOFs) encapsulated into Ru(bpy)32+ (Ru-MOF) (donor) coated with silver nanoparticles (AgNPs) shell (acceptor 1) and close proximity with DNA-ferrocene (Fc) (acceptor 2). Multistimuli responsive DNAzyme facilitated the accurate signal switch by both target ATX-a and hydrogen peroxide (H2O2). Because of the specific recognition of the aptamer toward ATX-a, an intricate design of the DNA sequence enabled the exposure of the Ag+-dependent DNAzyme sequence and H2O2 in situ generated Ag+ triggering a catalytic cleavage reaction to freely release the two ECL-RET energy acceptors, thus switching the ECL signal significantly and achieving ultrasensitive detection. It is noteworthy that AgNPs are key in this ECL-RET strategy, serving both as the gate-keepers for avoiding ECL probes leakage and also the ECL energy acceptors, and mostly importantly serving as the redox substrate for the subsequent DNAzyme catalytic signal switch. The proposed ECL-RET aptasensor for ATX-a detection displayed splendid monitoring performance with a quite low detection limit of 0.00034 mg mL–1. This sensor not only led to the development of a dual-quenching ECL-RET system but also provided meaningful multistimuli responsive ECL biosensing platform construction, which shows a promising application prospect in complicated sample analysis.
研究领域:
分析化学
·
生物传感
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2016
·Vol. 22
·期 25
·8508-8519
·
IF 5.771
Hao Yao,Miao Qi,Yuyang Liu,Wei Tian
Graphical Two binding sites better than one? The β-cyclodextrin/azobenzene (β-CD/Azo) host–guest binding sites of the two synthesized polymers have a pronounced effect on the morphology and size of the resulting Y-shaped supramolecular polymer self-assemblies with thermo and photo dual-responsiveness (see figure). Despite the remarkable progress made in controllable self-assembly of stimuli-responsive supramolecular polymers (SSPs), a basic issue that has not been consideration to date is the essential binding site. The noncovalent binding sites, which connect the building blocks and endow supramolecular polymers with their ability to respond to stimuli, are expected to strongly affect the self-assembly of SSPs. Herein, the design and synthesis of a dual-stimuli thermo- and photoresponsive Y-shaped supramolecular polymer (SSP2) with two adjacent β-cyclodextrin/azobenzene (β-CD/Azo) binding sites, and another SSP (SSP1) with similar building blocks, but only one β-CD/Azo binding site as a control, are described. Upon gradually increasing the polymer solution temperature or irradiating with UV light, SSP2 self-assemblies with a higher binding-site distribution density; exhibits a flower-like morphology, smaller size, and more stable dynamic aggregation process; and greater controllability for drug-release behavior than those observed with SSP1 self-assemblies. The host–guest binding-site-tunable self-assembly was attributed to the positive cooperativity generated among adjacent binding sites on the surfaces of SSP2 self-assemblies. This work is beneficial for precisely controlling the structural parameters and controlled release function of SSP self-assemblies.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Duan-Chao Wang,Xiaogang Yang,Hou-Yong Yu,Jiping Gu,Dongming Qi,Juming Yao,Qingqing Ni
This work presents the first fabrication of smart nonwoven fabric (DSR-CZPP) with extraordinary reversible double-stimulus responsive wettability, where carboxyl groups of cellulose nanocrystals/zinc oxide (CNC/ZnO) nanohybrids deposited on fabric surface can bond with hydroxyl group of the PDMAEMA-b-PHEMA-b-PMAAAB triblock polymer brushes that was prepared by using methyl methacrylate (HEMA), dimethylaminoethyl methacrylate (DMAEMA) and methacrylamide-azobenzene monomer (MAAAB) via reversible addition–fragmentation chain transfer (RAFT). The peculiar reversible double-stimulus responsive wettability of the DSR-CZPP can be modulated by triggering hydrophilic/hydrophobic transitions and lipophilic/oleophobic transitions under dual-stimulations of pH and UV light irradiation. The special molecular structure of the triblock polymer brushes enabled DSR-CZPP to intelligent modulation of oil-water separation under the control of "UV & pH double switch", meanwhile CNC/ZnO simultaneously can induce the photocatalytic degradation of organic dyes. Moreover, DSR-CZPP can have high removal ratios of various pollutants, such as metal ion (Cu 2+ ) and toxic organic solvent (silicone oil, acetone and chloroform). This smart and multifunctional fabric shows great potentials for treating complicated polluted water from most industrial fields.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
MACROMOLECULAR BIOSCIENCE
·
2020
·Vol. 21
·期 3
·2000291
·
IF 3.416
Zi-Hao Zhou,Jian-Guo Zhang,Qing Chen,Yan-Ling Luo,Feng Xu,Ya-Shao Chen
To well adapt to the complicated physiological environments, it is necessary to engineer dual- and/or multi-stimuli responsive drug carriers for more effective drug release. For this, a novel temperature responsive lateral chain photosensitive block copolymer, poly[(N-isopropylacrylamide- co -N,N-dimethylacrylamide) - block -propyleneacylalkyl-4-azobenzoate] (P(NIPAM- co -DMAA)- b -PAzoHPA), is synthesized by atom transfer radical polymerization. The structure is characterized by 1 H nuclear magnetic resonance spectrometry and laser light scattering gel chromatography system. The self-assembly behavior, morphology, and sizes of micelles are investigated by fluorescence spectroscopy, transmission electron microscope, and laser particle analyzer. Dual responsiveness to light and temperature is explored by ultraviolet–visible absorption spectroscopy. The results show that the copolymer micelles take on apparent light and temperature dual responsiveness, and its lower critical solution temperature (LCST) is above 37 °C, and changes with the trans-/cis- isomerization of azobenzene structure under UV irradiation. The blank copolymers are nontoxic, whereas the paclitaxel (PTX)-loaded counterparts possessed comparable anticancer activities to free PTX, with entrapment efficiency of 83.7%. The PTX release from the PTX-loaded micelles can be mediated by changing temperature and/or light stimuli. The developed block copolymers can potentially be used for cancer therapy as drug controlled release carriers.
研究领域:
药学
·
材料科学
·
纳米技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 26
·2310226
·
IF 13
Zhongwei Man,Zheng Lv,Yangyang Cao,Zhenzhen Xu,Qing Liao,Jiannian Yao,Feng Teng,Aiwei Tang,Hongbing Fu
Organic afterglow materials have significant applications in information security and flexible electronic devices with unique optical properties. It is vital but challenging to develop organic afterglow materials possessing controlled output with multi-stimuli-responsive capacity. Herein, dimethyl terephthalate (DTT) is introduced as a strong proton acceptor. The migration direction of N─H protons on two compounds Hs can be regulated by altering the excitation wavelength (Ex) or amine stimulation, thereby achieving dual-stimuli-responsive afterglow emission. When the Ex is below 300 nm, protons migrate to S 1-2 DTT , where strong interactions induce phosphorescent emission of Hs , resulting in afterglow behavior. Conversely, when the Ex is above 300 nm, protons interact with the S 0 DTT weakly and the afterglow disappears. In view of amine-based compounds with higher proton accepting capabilities, it can snatch proton from S 1-2 DTT and redirect the proton flow toward amine, effectively suppressing the afterglow but obtaining a new redshifted fluorescence emission with Δλ over 200 nm due to the high polarity of amine. Moreover, it is successfully demonstrated that the applications of dual-stimuli-responsive organic afterglow materials in information encryption based on the systematic excitation-wavelength-dependent (Ex-De) behavior and amine selectivity detection.
研究领域:
材料科学
·
光学材料
·
刺激响应材料
·
信息加密
·
物理化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Chang-Hui Wang,Yun-Shan Fan,Ze Zhang,Qian-Bao Chen,Tian-You Zeng,Qing-Yong Meng,Ye-Zi You
The synthesis and applications of dual- or multi stimuli-responsive polymers have gained increasing attention. One-pot strategy by combination two different polymerization mechanisms is promising for the synthesis of dually stimuli-responsive polymers in a rapid route. In this work, we report a convertible anionic ring-opening and RAFT polymerization by using asymmetrical trithiocarbonate as both an initiator for the anionic ring-opening polymerization and a chain transfer agent for RAFT polymerization to produce poly(propylene sulfide) (PPS)- poly( N -isopropylmethacrylamide) block-like copolymers . Furthermore, the ROS and temperature responsibility of the formed copolymer are also evaluated.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）