Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 6
·1-12
·
IF 23.2
Zhao Yanlong,Zhang Xichong,Hao Yilin,Zhao Yinghe,Ding Peng,Zhai Wei,Dai Kun,Zheng Guoqiang,Liu Chuntai,Shen Changyu
Hydrogels are regarded as an ideal medium for human-machine interaction (HMI) due to their adjustable modulus and flexibility, enabling seamless interaction with smart devices. However, in the field of medical rehabilitation, most of the hydrogel-based sensors are simply used to detect the motion signals of fragments and are rarely applied to help patients with rehabilitation training and improve the efficiency of doctors’ diagnosis. This is due to the unstable sensing properties and poor mechanical properties of most hydrogels. The poor durability greatly limits the application of hydrogel-based sensors. Here, a conductive hydrogel sensor with visual temperature sensitivity and good mechanical properties (300% strain, breaking stress 0.19 MPa) is fabricated by introducing polyvinyl alcohol (PVA)-borax system combined with a freeze-thaw physical regulation strategy. The PVA/PNIPAM/PEDOT: PSS (PPP) hydrogels possess a rapid response/recovery time (200 ms/200 ms), a low detection limit of 1% strain, and good stability and durability. Furthermore, by integrating the hydrogels with a LabVIEW circuit program and wireless transmission technology, we have created an advanced intelligent HMI system that facilitates monitoring, rehabilitation training, and remote diagnosis. Graphical
The conductive hydrogel sensor with visual temperature-sensitive change and excellent mechanical properties has been successfully prepared by introducing PVA-borax system and freeze-thaw physical regulation strategy. The breaking strain of PVA/PNIPAM/PEDOT: PSS hydrogels achieves 300%, and the breaking stress achieves 0.19 MPa. As a strain sensor, due to the presence of the conductive polymer PEDOT: PSS, PPP hydrogel has a fast response/recovery time (200 ms / 200 ms), a low detection limit of 1% strain, and good stability and durability, enabling accurate monitoring of various human movements. By further combining PPP hydrogel sensor with the LabVIEW circuit program and wireless transmission technology, an advanced intelligent HMI system integrating monitoring, rehabilitation training and remote diagnosis has been constructed.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 4
·717-723
·
IF 1.797
Duan Yinli,Ma Jing,Liu Jiao,Qiang Liangsheng,Xue Juanqin
In this paper, a facile and efficient method was performed to prepare the thermo-responsive Poly(N-isopropylacrylamide)/TiO 2 (TiO 2 /PNIPAM) with the dispersing of TiO 2 nanoparticles into PNIPAM. The structures of nanoparticles and the grafted polymer were confirmed by X-ray diffraction (XRD), Raman spectra, Fourier transform infrared spectra (FT-IR) and Dynamic Light Scattering (DLS). The interactions between the two components were studied by X-ray photoelectron spectroscopy (XPS), and the morphology of TiO 2 /PNIPAM was observed by scanning electron microscopy (SEM). The results showed that TiO 2 exhibited homogeneous dispersion, without sacrificing the properties of TiO 2 . Furthermore, The composite was used to photocatalytic degradation of Methylene blue (MB). The highest MB removal efficiency is 86.3 %. The photocatalytic activities above or below the lower critical solution temperature (LCST) of PNIPAM was also investigated. The experiment results show that the existence of PNIPAM contributed not only the thermo-responsive abilities to TiO 2 , but also the enhanced photocatalytic activities to TiO 2 . In addition, the corresponding mechanism of enhanced photocatalytic activity was proposed. The results manifest that the well-designed TiO 2 /PNIPAM is a promising candidate in wastewater treatment application.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2018
·
IF 6.012
Fang Chen,Qi Cao,Chen Dong,Bo Shao,Wei Zhai,Xiaoyan Ma,Bingbo Wei
The extraordinary high pressure and temperature produced during cavitation is crucial for ultrasonic sonochemistry. However, the cavitation effect is usually confined to a small zone nearby the ultrasonic horn, outside of which ultrasound produces much less effects on chemical reaction. In present work, in order to expand the range of effective zone and intensify the cavitation effect, N 2 aeration was introduced to an ultrasonic polymerization process of CuO@PNIPAM in aqueous solution. By increasing the number of bubble nucleus gathered on the CuO surface and lowering the surface tension of the aqueous solution, the cavitation effect is intensified on the CuO surface within the whole reaction vessel, which benefits the covalently bonding between PNIPAM and CuO to a large degree and results in the formation of CuO@PNIPAM hybrid composite with excellent interfacial bonding. It is promising that the hybrid composite can be applied as temperature responsive glucose sensing platform with ON and OFF states due to the wettability change of PNIPAM versus temperature.
研究领域:
材料科学
·
化学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 40
·e202401922
·
IF 1.9
Ting-Ting He,Ming-Xin Zhao,Yang Li,Wen-Yuan Huang,Ya-Lan Yu,Hao Wang
Graphical Monodisperse self-bursting thermo-responsive PNIPAM microcapsules has been developed using droplet microfluidic techniques and free radical polymerization. The encapsulated model drugs remain protected without any leakage until triggered by specific circumstances or needs above the VPTT. The PNIPAM microcapsules exhibit reversible and rapid responsiveness, showing significant potential as microcarriers for rapid release of liposoluble substances. A straightforward microfluidic approach has been developed to fabricate the monodisperse thermo-responsive self-bursting poly(N-isopropylacrylamide) (PNIPAM) microcapsules for the rapid on-demand release of liposoluble drugs. The PNIPAM microcapsules possess excellent structural integrity with a dense shell and spacious cavity, providing ample space for encapsulating liposoluble matters. The swollen hydrogel shells effectively prevent drugs leakage and contamination below the volume phase transition temperature (VPTT), while the shrunken hydrogel shells enable drugs to release from microcapsules above the VPTT. The microcapsules demonstrate rapid thermo-responsiveness, with drug release occurring within 4–6 minutes and subsequent swelling taking place within 2–3 minutes. The PNIPAM microcapsules exhibit a reversible and repetitive swelling/shrinking response to temperature changes. The thermo-responsive self-bursting PNIPAM microcapsules exhibit great potential as microcarriers for encapsulating, storing, and rapidly releasing liposoluble substances such as drugs, fluorescent dyes, corrosion inhibitors, and other chemical ingredients. The simple, controllable and reproducible microfluidic approach presented here provides valuable guidance for the design and fabrication of monodisperse PNIPAM microcapsules.
研究领域:
材料科学
·
药学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 12
·48486
·
IF 2.188
Xiaojing Zhang,Weiwei Shen,Jingcheng Dou,Yang Meng,Shaoming Fang,Ruixue Liu
In this study, water-soluble octa(3-chloroammoniumpropyl) silsesquioxane (OCAPS) was found to aggregate into nanoparticles with a positive charge in solution, which can attract persulfate anion radical to initiate N-isopropylacrylamide monomers. Due to the electrostatic and hydrogen bond interaction between OCAPS and poly(N-isopropylacrylamide) (PNIPAM) chain, OCAPS can act as an effective physical crosslinker to result in a nanocomposite hydrogel (OCAPS-PNIPAM) with very small loading N, N′-methylene-bisacrylamide (50–100 ppm). The incorporation of OCAPS increases the crosslinking degree of the PNIPAM hydrogel and decreases the swelling ratio in deionized water. The mechanical properties of OCAPS-PNIPAM hydrogel were enhanced greatly by the presence of OCAPS and can be adjusted by the feed ratio. The compression and elasticity moduli vary from 3.52 to 7.59 kPa and 7.67 to 33.91 kPa, respectively. The tensile strength ranges from 6.82 to 243.41 kPa with fracture energy between 503.5 and 4781.7 J·m −2 . Rheological measurements suggest that OCAPS-PNIPAM hydrogels have stable networks and the loss factor decreases as increasing OCAPS content. OCAPS-PNIPAM hydrogels also can self-heal under certain conditions with low crosslinker loading. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48486.
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 THE CHINESE CHEMICAL SOCIETY
·
2020
·Vol. 67
·期 11
·2004-2011
·
IF 1.554
Na Zhang,Fei Wang,Chang-chen Cai,Qian Sun,Kai Zhang,Ai-xiang Li,Jun-ying Weng,Qiu-hong Li
Based on a facile and universal method using noncovalent bonding, here, polymer-modified covalent organic framework materials (COFs) were rapidly prepared. PNIPAM-modified COF (COF-PNIPAM) was synthesized by electrostatic self-assembly between COF prepared by low-cost melamine and terephthalaldehyde and carboxyl-terminated poly( N -isopropylacrylamide) (PNIPAM) prepared via reversible addition-fragmentation chain transfer polymerization. The carboxyl-terminated PNIPAM was characterized by Gel Permeation Chromatography and Ultraviolet and Visible Spectroscopy (UV–vis). COF and COF-PNIPAM were characterized by Fourier Transform Infrared Spectroscopes, Scanning Electron Microscope, Transmission Electron Microscope, X-Ray Diffractomer (XRD), and Brunner-Emmet-Teller (BET) measurements. The results showed that the COF-PNIPAM was successfully prepared. The Pickering emulsion properties of the COF-PNIPAM in a water-to-toluene mixed system were studied, and when the water-to-oil ratio is 2:1, a stable emulsion can be obtained. However, the results show that the PNIPAM chains of COF-PNIPAM nearly lose their temperature responsiveness.
研究领域:
材料科学
·
化学工程
·
胶体与表面化学
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2020
·Vol. 7
·期 5
·1006-1013
·
IF 6.395
Shuai Cao,Jingyun Jiang,Qingyong Tian,Cang Guo,Xuzhe Wang,Kun Dai,Qun Xu
Solar distillation is a sustainable and promising technique to generate fresh water. However, the solar vapor generation is a high energy consumption process, resulting in a low water yield under natural sunlight. Hence, developing of advanced evaporators that can simultaneously reduce the energy requirement of water vaporization and accelerate solar water evaporation remains a great challenge. In this study, we report the fabrication of a multifunctional hydrogel of H x MoO 3 /PNIPAM with PNIPAM as hydratable skeleton and H x MoO 3 as the light-absorbing unit for solar water evaporation. The experimental results demonstrate that the as-prepared hydrogel owns excellent photothermal activity. Accurately, the fabricated hydrogel -based solar evaporators achieved high water evaporation rate of 1.65 kg m −2 h −1 with the energy conversion efficiency of 85.87% under 1 kW m −2 irradiation. The enhanced photothermal activity of H x MoO 3 /PNIPAM hydrogel can be attributed to the synergistic effects of the components composed in this hierarchical architecture that change the water state and further speed up water evaporation. The H x MoO 3 /PNIPAM evaporators indicate its great potential for practical implementation of solar water evaporation.
研究领域:
材料科学
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物理化学
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能源科学
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环境工程
·
纳米科技
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Pengwei Huo,Zhefei Ye,Huiqin Wang,Qingfeng Guan,Yongsheng Yan
In this work, thermo-responsive PNIPAM@AgBr/CSs composite photocatalysts were successfully fabricated by grafting method. The thermo-responsive composite photocatalysts were further characterized by SEM, EDS , XRD , FT-IR, DRS and PL , the results demonstrated that the surface of CSs was successfully loaded with AgBr and further grafted with PNIPAM, and the grafted PNIPAM not only obtained the thermo-responsive performance, but also synergistically enhanced visible light photocatalytic activity toward degradation of tetracycline (TC) antibiotics. The influenced factors of photocatalytic degradation were also investigated, the results showed that the dosage of PNIPAM and the reacted temperature were obviously affected the degradation rate of TC. Lastly, the photocatalytic degradation mechanism of as-obtained thermo-sensitive photocatalyst was also discussed in detail. This work might offer a way to obtain the intelligently composite materials for switchable photocatalytic processes.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 4
·1-15
·
IF 21.8
Zhang Yicheng,Guo Weijie,Chen Siqi,Fang Yan,Weng Yunxiang,Liu Haiqing,Chen Qinhui
Hemostasis of incompressible trauma has been a challenge in the field of injury first aid, and these wounds are not suitable for the traditional dressings and for applying pressure to stop hemorrhage together. In this study, a Janus sponge of bioactive glass-poly (N-isopropylacrylamide) (PBG-PNIPAM) with mimic tissue structure was prepared by attaching different modified BG nanoparticles to the top and bottom layers of a polyvinyl alcohol sponge to improve hemostasis at incompressible wounds. Upon contacted with blood, the hydrophilic layer which was push into the internal tissue released Ca 2+ and SiO 4 4− to activate the endogenous and exogenous coagulation cascade to accelerate blood coagulation, while the hydrophobic layer with excellent breathability kept in epidermis could block wound to decrease the blood loss and prevent the growth of bacteria. In the rat incompressible model, the blood loss of PBG-PNIPAM Janus sponge was much less than 2.3 times of the commercially available gelatin hemostatic sponge. In vitro results showed that the PBG-PNIPAM Janus sponge exhibited excellent clotting ability, high hemocompatibility and low cytotoxicity. This composite Janus sponge with hemostatic and antibacterial properties is expected to be applied in sharp instrument injuries. Graphical
研究领域:
生物学
·
医学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2023
·
IF 6.2
Yang Yang,E. Liu,Wenli An,Yan Hu,Xuehuan Xia,Shimei Xu
Mimicking the anisotropic structure and environmental adaptation of organisms in nature remains a key objective in the field of hydrogels. However, it has been very challenging due to complex fabrication and confined application only in water. Here, we demonstrate a new strategy of spontaneous fabrication of an anisotropic hydrogel based on our finding in the tropic movement of gelatin toward the Teflon template. The obtained hydrogel exhibits fast response and recovery under temperature stimuli both in aqueous and non-aqueous environments, making use of the approximate transition temperature and opposite phase transition behavior of gelatin and poly(N-isopropylacrylamide) (PNIPAm). Its recovery performance in water is more than 50 times faster than that of the PNIPAm hydrogel. Furthermore, the PNIPAm/gelatin hydrogel can achieve 3D complex deformations, stealth deformation, erasable and reprogrammed surface patterning, and multistage encryption by simply modulating the location and shape of gelatin to achieve an anisotropic structure. The work provides a simple and versatile way to obtain an anisotropic hydrogel with a definite and predictable structure, which is demonstrated across a range of different monomers. It improves the responsive performance and broadens the hydrogel application to the non-aqueous environment. Additionally, this tropic movement of gelatin can be extended for the design of new types of anisotropic materials and thus endows the materials with diverse functionality.
研究领域:
材料科学
·
生物仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Hongwei Lu,Danling Wang,Daye Huang,Luyao Feng,Huapeng Zhang,Peng Zhu
PNIPAM as a stimuli-responsive polymer has generated extreme interests due to its versatile applications. However, there is no research report on whether PNIPAM micro/nano-particles can be extracted from its suspension after phase separation. In the present work, LCST-type phase separation in self-synthesized PNIPAM/water system was investigated in depth by dividing the DLS testing process into four stages. In addition to quenching duration, temperature rise process, quenching temperature and PNIPAM concentration all have a great influence on particle size of the suspension. Meanwhile, the steady-state rheology and dynamic viscoelasticity results show that PNIPAM micro/nano-particles in the suspension are “soft” that can deform. Finally, FE-SEM was used to observe the morphology of dehydrated PNIPAM extracted by sessile droplet evaporation under different conditions. The results indicate that these “soft” particles are easier to fuse together, do not have sufficient mechanical strength to maintain their spherical morphology after dehydration. But the above fusion can be suppressed by adjusting evaporation conditions to acquire smaller PNIPAM particles which have sufficient mechanical properties to keep their basic particle morphology . Further, by changing evaporation pressure to positive or negative pressure, dehydrated PNIPAM micro/nano-particles with excellent uniformity and separation can be obtained. This work will provide guidance for extracting micro/nano-particles from polymer/diluent systems with LCST .
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCES IN POLYMER TECHNOLOGY
·
2020
·
IF 1.539
Jing Shang,Ruonan Gao,Fu Su,Huaguang Wang,Dan Zhu
The complex rheology and the phase behavior of thermally sensitive poly(N-isopropylacrylamide) (PNIPAM) microgels have been investigated in both the swollen and collapsed states by using microrheology. To avoid the interactions between the tracer probes and the PNIPAM microgels, such as the adsorption or the depletion effect, the probes of silica (SiO2) particles have been grafted with PNIPAM chains (SiO2-PNIPAM) and characterized with Fourier transform infrared spectroscopy (FTIR). The successful preparation of SiO2-PNIPAM has also been proved by the investigation of the particle size and morphology with dynamic light scattering (DLS) and transmission electron microscope (TEM) below and beyond the phase transition temperature of PNIPAM. The microrheology of the PNIPAM microgel suspension has been investigated by using the prepared SiO2-PNIPAM particles as microrheological probes, and the results show that the diffusive coefficient of the probes in the swollen state is one-fifth of that in the collapsed state, and the viscosity of the PNIPAM microgel suspension in the swollen state is four times higher than that in the collapsed state, indicating SiO2-PNIPAM is a good probe in the microrheological study of PNIPAM microgel suspensions.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）