Polymer Chemistry
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2015
·Vol. 6
·期 32
·5876-5883
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IF 5.52
Yingge Shi,Meiying Liu,Ke Wang,Fengjie Deng,Qing Wan,Qiang Huang,Lihua Fu,Xiaoyong Zhang,Yen Wei
Graphene oxide (GO), as the precursor of graphene, has inspired great research interest over the past few years due to its excellent physicochemical properties and promising applications. Surface modification of GO with polymers is a general route for enhancing its processibility and improving its performance. Although great effort has been put into this field, the surface modification of GO with polymers in an aqueous solution has proven to be problematic due to the restacking of GO. In this work, we have developed a novel strategy for the preparation of GO thermo-responsive polymer nanocomposites in an aqueous solution via a combination of mussel inspired chemistry and a reversible addition–fragmentation chain transfer (RAFT) polymerization. Two simple steps are involved in this strategy. First, GO was coated with polydopamine (PDA) through a self polymerization of dopamine in a weakly alkaline aqueous solution. Then, the thermo-sensitive polymer poly(N-isopropylacrylamide) (PNIPAM), derived from a polymerization, was facilely grafted onto the PDA coated GO (GO-PDA) through a Michael addition reaction. The finally product (GO-PDA-PNIPAM) was characterized in detail by a series of methods, including Fourier transform infrared spectroscopy, thermal gravimetric analysis, transmission electron microscopy and X-ray photoelectron spectroscopy. These results suggested that PNIPAM can successfully and effectively functionalize GO through a rather facile strategy in an aqueous solution, at room temperature and in an air atmosphere. More importantly, GO-PDA-PNIPAM exhibited excellent dispersibility in aqueous solutions and some organic media, and displayed a good thermo-responsiveness. Taking advantage of PDA and polymerizations, this strategy is expected to be extended for the preparation of many other polymer nanocomposites by employing different nanomaterials and monomers. Therefore, the strategy described in this work should be of great research interest for the preparation and applications of nanocomposites.
研究领域:
材料科学
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化学
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纳米技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Fan Hao,Liangyu Wang,Binling Chen,Lin Qiu,Jun Nie,Guiping Ma
Smart response hydrogel has a broad application prospect in human health real-time monitoring due to its responses to a variety of stimuli. In this study, we developed a novel smart hydrogel dressing based on conductive MXene nanosheets and a temperature-sensitive PNIPAm polymer. γ-Methacryloxypropyltrimethoxysilane (KH570) was selected to functionalize the surface of MXene further to improve the interface compatibility between MXene and PNIPAm. Our prepared K-M/PNIPAm hydrogel was found to have a strain-sensitive property, as well as a respond to NIR phase change and volume change. When applied as a strain flexible sensor, this K-M/PNIPAm hydrogel exhibited a high strain sensitivity with a gauge factor (GF) of 4.491, a broad working strain range of ≈250%, a fast response of ∼160 ms, and good cycle stability (i.e., 3000 s at 20% strain). Besides, this K-M/PNIPAm hydrogel can be used as an efficient NIR light-controlled drug release carrier to achieve on-demand drug release. This work paved the way for the application of smart response hydrogel in human health real-time monitoring and NIR-controlled drug release functions.
研究领域:
材料科学
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生物医学工程
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纳米技术
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健康监测
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Le Yin,Mu Hu,Yajie Liu,Yiyi Lin,Yuan Wang,Shaojun Yuan
The development of intelligent, environmentally responsive oil–water separation membranes with reversible wettability presents a promising strategy for controllable emulsion separation and the advanced treatment of complex oily wastewater. Wastewater. In this study, a novel thermally responsive membrane with switchable wettability between superhydrophilic and superhydrophobic states was fabricated via in situ growth of bimetallic metal–organic frameworks (CoZn-ZIF) on electrospun poly(vinylidene fluoride)/poly(N-isopropylacrylamide) (PVDF/PNIPAM) nanofiber membranes. The resulting PVDF/PNIPAM@CoZn-ZIF membrane leverages the thermally induced reversible conformational transition of PNIPAM to exhibit underwater superoleophobicity below its lower critical solution temperature (LCST) and under-oil superhydrophobicity above LCST. This switchable wettability enabled efficient on-demand separation of both oil-in-water (O/W) and water-in-oil (W/O) emulsions, achieving water permeation fluxes exceeding 1900 L·m–2·h–1 and oil permeation fluxes over 1150 L·m–2·h–1, with separation efficiencies above 99.00% and 99.60%, respectively. Moreover, the embedded Co1Zn3-ZIF served as a catalyst to activate peroxymonosulfate (PMS), generating reactive oxygen species (·OH and·SO4–) and enabling rapid degradation of methylene blue, with a removal efficiency of 99.92% within 15 min. This study presents a multifunctional composite membrane as an intelligent, efficient platform for integrated oil–water emulsion separation and organic pollutant remediation.
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Huanxin Huang,Conli Chen,Pihui Pi,Xiufang Wen,Shouping Xu
Atmospheric water harvesting (AWH) is a sustainable solution to freshwater scarcity, yet balancing sorption capacity, energy efficiency, and stability remains challenging. Herein, we developed a multi-scale synergistically optimized composite sorbent (NW-NA@PDA-Cl) by integrating a poly (N-isopropylacrylamide)- co -poly (sodium acrylate) (PNIPAM- co -PAAS) copolymer network onto a non-woven (NW) fabric scaffold. Hierarchical diffusion channels were constructed via freeze-drying to accelerate mass transfer, while a polydopamine (PDA) coating facilitated molecular-level anchoring of lithium chloride (LiCl) through coordination and electrostatic interactions, effectively suppressing salt leakage. NW-NA@PDA-Cl achieved exceptional sorption capacities of 1.26 and 3.11 g g - 1 at 30% and 90% relative humidity (RH), respectively. Benefiting from the thermoresponsive restructuring of the hydrogen-bonding network, the material exhibited rapid desorption kinetics (78.6% release within 20 min at 60 °C) and a significantly reduced evaporation enthalpy (1536.5 J g - 1 ). Under 1.0 sun, photothermal effects drove surface temperatures to 65 °C, enabling efficient passive water recovery. Field tests demonstrated a daily yield of 1.27 g g - 1 day - 1 with drinking-standard water quality. This multi-scale design strategy provides a promising pathway for developing high-performance, energy-efficient, and stable AWH systems.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jie Ding,Danni Hou,Yuan Tian,Rong Li,Yuyan Wang,Junzhong Jiang,Yucai Hu,Chengheng Wu,Dan Wei,Jing Sun,Zi Qiao,Hongsong Fan
It's a new trend to realize wound regeneration whereas integrate real-time monitoring and controllable therapeutic stimulation. We herein raise a smart and bioactive hydrogel which enables wireless temperature sensing and on-demand photoelectric stimulation for dynamic wound management. We put forward a unique phase transition mechanism in thermo-responsive poly(N-isopropylacrylamide) (PNIPAM) hydrogel by introducing bioactive motifs inclusive gelatin-dopamine (Gel-DA), named PGD, which significantly enhances temperature sensing feasible for wound monitoring by molecule entanglement. Furthermore, we construct a PGD-BTG dressing by incorporating TiO₂/Bi₂S₃/rGO heterogeneous nanoparticles (BTG NPs) into PGD, expecting to build an all-in strategy of remote photoelectrical stimulation therapy and wound temperature monitoring. The combination of hydrophilic Gel-DA and BTG in the PNIPAM molecular chain establishes a different temperature response mechanism without significant volume phase transition, but with temperature response coefficient as high as −3.92%/°C, which is much higher than PNIPAM and most reports. Finally, by embedding Bluetooth, we realize continuous temperature monitoring to track inflammatory status while generating exogenous electric fields under red-light irradiation, in addition to provide regenerative niche for wound healing. Combining the native conformal adhesion to wound surface and bioactivity, we verify the superior advantageous of this platform a transformative approach for wound management, by unifying regenerative niche, real-time inflammation surveillance and wireless stimulation within a single bioactive platform.
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DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Xiaoyan He,Penggai Ma,Shuo Ma,Runze Cao,Xin Tian,Yanling Liang,Jing Li,Yuanyuan Lu,Zhiqiang Wang,Xiaoquan Lu
Conductive hydrogels have attracted much attention as candidates for flexible strain sensors. However, the preparation of multifunctional hydrogel sensors with excellent comprehensive performance is still a great challenge. In this study, a facile preparation method was used to prepare the conductive hydrogel MR/LM-PAAm-PEI (ML) by mixing PNIPAM microgels and gallium-based liquid metals. The hydrogel not only has excellent mechanical properties but also exhibits good temperature responsiveness and electrical properties, as well as efficient adhesion and excellent self-healing ability. The sensors of the ML hydrogel are capable of accurately and reproducibly recognizing handwriting and encrypted information and have excellent sensing ability as strain sensors (sensitivity GF value up to 5.45, ultra-fast response and recovery times of 160 ms and 170 ms, respectively, and a wide range of strain sensing up to 10–400%). The sensing mechanism of the hydrogel relies on changes in its internal structure when it is deformed or exposed to temperature variations. These structural changes lead to alterations in the conduction pathways within the hydrogel, which in turn triggers significant changes in the electrical signal. In particular, the sensors of the ML hydrogel have excellent thermal sensitivity and were used as temperature sensors over a wide range of 20–70 °C. The use of the sensor for finger movements to transmit Morse code messages has also been successful. This work offers prospects for the development of multifunctional strain sensors.
研究领域:
材料科学
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生物医学工程
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传感器技术
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2014
·Vol. 90
·期 3
·407-414
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IF 2.494
Xiangye Li,Ruting Chen,Shouhong Xu,Honglai Liu,Ying Hu
BACKGROUND Injectable polymer gels for tissue engineering offer specific advantages over preformed scaffolds. They can transform from a sol to a block gel as a response to an external stimulus. One effective strategy for improving the mechanical strength of a gel is to introduce an inorganic material. RESULTS Microparticles composed of a hard SiO 2 core covered with a thermoresponsive hybrid gel (sodium hyaluronate/poly( N -isopropylacrylamide); NaHA/PNIPAm) were synthesized. The microparticles were characterized by dynamic light-scattering and transmission electron microscopy; rheological measurements were also performed. The microparticles were perfectly spherical and had a core–shell structure. They can perform a sol–gel transformation, that is, they shrank and assembled to form a macroscopic hydrogel through physical cross-linking at the gelation temperature ( T gel ), which was determined by rheological measurements. The T gel was adjusted by changing the concentration of microparticles or Ca 2+ ions. CONCLUSION The introduction of NaHA and SiO 2 improved the mechanical properties of the macroscopic gels. The rigidity and stability of the macroscopic gel were controlled by the molecular weight of NaHA and the amount of PNIPAm. Such injectable hydrogels might have potential as scaffold biomaterials, and are expected to be the ‘ink’ for three-dimensional bioprinters. © 2014 Society of Chemical Industry
研究领域:
生物材料学
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组织工程学
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高分子化学
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DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2018
·Vol. 219
·期 23
·1800329
·
IF 2.492
Haihuan Wang,Jianghao Zhan,Kechen Xiao,Feng Luo,Jiehua Li,Hong Tan
A self-healing composite hydrogel with thermoresponsive three-stage optical adjustment (opaque-transparent-translucent) is achieved by combining polyampholyte hydrogel (PAH) with a small amount of poly( N -isopropylacrylamide) (PNIPAM) nanogels. The PAH has an upper critical solution temperature to dominate the initial optical stage of reversible opaque-transparent transition and also offers its self-healing properties via reversible ionic bonds. Meanwhile, the PNIPAM shows a lower critical solution temperature by hydrophilic-hydrophobic phase transition and synergistic clustering of PAH, which controls the subsequent optical stage of reversible transparent-translucent transition. Therefore, the PAH/PNIPAM composite hydrogel shows a reversible three-stage optical modulation by controlling temperature from low (<15 °C) to medium (15–30 °C) to high (>30 °C) via double phase transition behavior of PAH/PNIPAM. Through different analytical methods, the synergistic thermoreposensive effects of PNIPAM nanogels and the bulk PAH are demonstrated. Finally, a prototype of a smart window is designed to demonstrate one of its potential applications.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2018
·
IF 0
Yufeng Bai,Zailin Gong,Chunhua Ge,Lixia Wang,Weifang Han,Xiangdong Zhang
This article reports on the fabrication of hybrid boron nitride (BN) grafted with thermoresponsive poly (N-isopropylacrylamide) (PNIPAM) and their self-flocculation effect caused by the thermal phase transition and entanglement behavior of PNIPAM. Compared with the initial BN, the PNIPAM graft BN (BN-PNIPAM) has larger area, pore volume and self-flocculation effect with rapid response to temperature. After grafting, the effective self-flocculation could be acquired in a wide concentration from 0.01 g/L to 10 g/L, the corresponding removal percentage with the phase transition is higher than 95% at high initial concentration. Furthermore, BN has a significant increase in the absorption of hydroquinone after grafting. Thermoresponsive adsorption and self-coagulation will make BN-PNIPAM recyclable in potential water restorations.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
COLLOID AND POLYMER SCIENCE
·
2022
·Vol. 300
·期 9
·1087-1099
·
IF 2.434
Peña Jhair Andres,Du Xin Jing,Xing Jin Feng
Hybrid nanomaterials were synthesized via grafting poly(N-isopropylacrylamide) (PNIPAM) over silica nanoparticles in a one-pot reaction using the internal and external surface of the nanoparticles as a microreactor system. Silica nanoparticle properties were tuned through templating and pore-swelling agents which allows obtaining spherical and elongated morphologies. Polymerization reactions were carried out at 80 °C for 4 h, using two initiator systems and N,N′-methylenebisacrylamide as a cross-linker. The structures obtained were studied by SEM and TEM micrographs, and the presence of polymer was confirmed through 1 HNMR and FTIR analysis. The thermoresponsive behavior was analyzed by DLS and DSC. It was found that the silica core structure and the initiator solubility affect considerably the aggregation and the size distribution of the grafted nanoparticles. Therefore, it is observed that different parameters can be used to drive grafting reactions without any previous functionalization step on the core surface, showing a straightforward method for their production.
研究领域:
材料科学
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化学工程
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纳米技术
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2021
·
IF 5.706
Jin-Tao Du,Meng Qiao,Yuan Pu,Jie-Xin Wang,Jian-Feng Chen
The reduction of nitroarenes is usually catalyzed by heterogeneous catalysts. In this work, highly stable aqueous dispersions of monodisperse Pt, Pd, and Au nanoparticles stabilized by thermosensitive polymer, poly(N-isopropylacrylamide) (PNIPAM), are conveniently synthesized with the average sizes of 2.3, 3.1, and 2.3 nm, respectively. The modulation of the hydrophilic-hydrophobic nano-environments of the catalysts can be selectively provided by utilizing the temperature-responsive characteristics of PNIPAM. They are effective and thermosensitive pseudohomogeneous catalysts for nitroarenes reduction. The decreasing trend of catalytic activity is as follows: PNIPAM-Au > PNIPAM-Pd > PNIPAM-Pt. The catalytic reduction of nitrobenzene (NB), 4-nitrophenol (4-NP), and o-nitroaniline (o-NA) follow the pseudo-first-order kinetics, and the catalytic rates can be tuned by utilizing their temperature-responsive behavior. PNIPAM-Au nanocatalysts exhibit high turnover frequencies (TOF) up to 84, 12.9, and 40 min −1 for catalytic reduction of NB, 4-NP, and o-NA at 20 °C, respectively, which are one of the highest values ever reported.
研究领域:
化学
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催化科学
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材料科学
✓ 已验证
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DOI
高影响因子
DYES AND PIGMENTS
·
2015
·
IF 3.966
Dehua Li,Alexis Munyentwali,Guang Wang,Meiduo Zhang,Shuangxi Xing
A dual-responsive amphiphilic diblock copolymer , poly(styrene- co -1-(2-methacryloxyethoxy)-2-(2-pyridyl)benzimidazole)- block -Poly( N -isopropylacrylamide- co -3-biphenyl-3-phenyl-8-methacryloxy-3 H -naphtho[2,1- b ]pyran- co -4-methamino-9-allyl-1,8-naphthalimide), also denoted as P(St- co -PBI)- b -P(NIPAM- co -NP- co -MANI), was synthesized by reversible addition fragmentation chain transfer polymerization followed by assembling into micelles with hydrophobic P(St- co -PBI) block as core and thermoresponsive P(NIPAM- co -NP- co -MANI) block as the shell in aqueous solution. Dynamic light scattering , transmission electron microscopy and optical transmittance were used to characterize the particle morphology and thermosensitivity of the micelles solution. In addition, the fluorescence emission of the micelles could be reversibly modulated “on” and “off” by the photochromic naphthopyran upon UV and thermal back reaction, which promoted naphthopyran transformation between merocyanine forms and original closed form. Moreover, the spatial distance between the two fluorescence dyes could be regulated by temperature, resulting from the collapse or extension of PNIPAM in aqueous solution. This property enabled the polymeric assemblies to serve as sensitive ratiometric fluorescent thermometers.
研究领域:
高分子化学
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材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）