TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Yan Huang,Zhangpeng Li,Kaiming Hou,Shuwen Liu,Qiulong Gao,Xiaonan Miao,Jinqing Wang,Shengrong Yang
In this study, a polydopamine (PDA)-modified MXene-PNIPAM (pMP) hydrogel is prepared using a soap-free emulsion polymerization method, which shows enhanced anti-oxidative, photo-thermal, and tribological properties. The introduction of PDA not only inhibits the oxidation of MXene but also enhances the photo-thermal conversion efficiency of the hydrogel. Even after 50 days, it can still maintain good photo-thermal conversion performance. Moreover, compared with PNIPAM hydrogel, the friction coefficient (COF) and wear volume of pMP hydrogel as lubricant were reduced by 33% and 85%, respectively. Interestingly, the control of COF with excellent reversibility and durability is achieved using pMP hydrogel modulated by near-infrared light. The pMP composite hydrogel exhibits promising prospects in the fields of intelligent robots and biomedical devices.
研究领域:
材料科学
·
智能材料
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2020
·Vol. 16
·期 12
·3063-3068
·
IF 3.14
Chunfang Li,Qihao Xue,Zhaoyang Ji,Yaxia Li,Hongyan Zhang,Dongxiang Li
Photonic crystals (PCs) are periodic dielectric structures with photonic bandgaps and they can be used to control and manipulate photons effectively. Novel photonic crystal materials with tunable bandgaps can be prepared by changing the refractive index of the dielectric or lattice parameters under external stimuli, while using temperature to adjust the photonic band gap is a simple and convenient method. In this paper, silica PCs having different pseudo-gaps in the range of 450–750 nm were prepared with colloidal SiO2 spheres of different sizes. Thermo-sensitive PNIPAM hydrogel was then infiltrated into the PCs to obtain PNIPAM-PCs, whose pseudo-gap blue-shifted when the temperature was changed from 24 to 34 °C and exhibited good reversibility. The PCs with tunable bandgaps are significant for the development of integrated photonic devices, sensors, and in detection and other technologies.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Jie Zhang,Jia Liu,An Liu,Shu He,Wei Shao
In recent years, smart hydrogels have been widely applied to various types of hydrogel actuators due to their unique stimulus responsibility, such as temperature responsiveness, near-infrared (NIR) light responsiveness, pH responsiveness, etc. Herein, segmented poly (N-isopropyl acrylamide) (PNIPAM) based hydrogel actuators with both temperature and NIR light actuation behaviors were constructed. Polydopamine (PDA) was firstly used to modify MXene nanosheets to fabricate an efficient photothermal conversion material. Then they were added into PNIPAM matrix to prepare PDA@MXene/PNIPAM hydrogels. The prepared PDA@MXene/PNIPAM hydrogels exhibited three-dimensional network structure with the tensile strength of 26.84 kPa, and they were successfully assembled into segmented hydrogel actuators. The assembled segmented hydrogel actuator exhibited high bending angle of 470° in 1.75 s in 55 °C hot water and bending angle of 203° in 15 s when irradiated by 6 W/cm 2 NIR light. The segmented hydrogel actuators displayed good programmable actuation performance. Finally, they were applied as smart devices, such as hydrogel hook for grasping object, switch for controlling circuit and valve for governing fluid flow. This work provides a novel strategy for fabricating programmable hydrogel actuators and will inspire new ideas and constructions for smart soft hydrogel actuators.
研究领域:
材料科学
·
智能器件
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 8
·085708
·
IF 1.449
Bian Wang,Qingjuan Wang,Yuting Zhu,Litao Kang,Jingxin Zhu,Fuyi Jiang,Wei Du,Dongjiang You,Zongtao Zhang,Feng Gao
Cesium tungsten bronze (CsxWO3) is an important functional material for energy efficient windows, showing excellent near infrared (NIR) shielding ability but no optical switching ability. In this paper, we demonstrate a photo-/thermo-dual-responsible CsxWO3/PNIPAM composite by dispersing CsxWO3 nanoparticles into PNIPAM hydrogels. Combination of the photothermic conversion ability of CsxWO3 with the thermochromic property of PNIPAM makes this hydrogel responds to both thermo- and photo-stimuli. In sunlight, the CsxWO3 component converts the absorbed infrared light into heat, triggering the phase transition of PNIPAM and switching the hydrogel into visibly opaque state (for example, transmittance decreased from 58% down to 15% at 590 nm). At the same time, an ambient temperature >32 °C can also initiate the phase transition of PNIPAM. Therefore, a photo- and/or thermo-derived transition between a 'transparent NIR-shielding' state and a 'full-solar-spectrum shielding' state is achieved, making it highly attractive for the applications as energy efficient windows for buildings in hot climate.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Jingwei Liu,Xuhao Fan,Yufeng Tao,Chunsan Deng,Kewang Yu,Wenguang Zhang,Leimin Deng,Wei Xiong
The widespread use of stimuli-responsive hydrogels is closely related to their synthesis efficiency. However, the widely used thermal-responsive poly(N-isopropylacrylamide) (PNIPAM) hydrogels usually require a time-consuming synthesis process to produce (more than 12 h) and exhibit a relatively slow response speed in the field of cryo-polymerization. In this study, a sequence of thawing polymerization after freezing polymerization by a two-step method of free radical polymerization for the efficient synthesis of PNIPAM hydrogels (merely 2 h) with an excellent comprehensive performance is demonstrated. Results show that the overall performance of the as-synthesized PNIPAM hydrogels is at the top level among reported works despite the significantly reduced preparation time. Moreover, after incorporating multi-walled carbon nanotubes (MWNTs), the PNIPAM hydrogels exhibit a rapid near-infrared (NIR) light-response and programmable shape-morphing capability. It is believed that such a viable and time-saving synthetic method for producing PNIPAM hydrogels of high performance will lay a solid foundation for drug delivery and smart actuators.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Huijing Li,Yun Liang,Guorong Gao,Shuxin Wei,Yukun Jian,Xiaoxia Le,Wei Lu,Qingquan Liu,Jiawei Zhang,Tao Chen
Living creatures have the nature of actuating and sensing under external stimuli to better adapt to the environment. For instance, the combination of muscles actuation and skin sensing ensures our intelligent interaction with external environments. In terms of the soft robot, implanting sensation and actuation in one system can assist us to control it better and more efficiently. However, in the development of biomimetic materials, the simultaneous realization of actuating and sensing performance in bionic soft robots is still a great challenge. Here, we propose a novel asymmetric bilayer CNTs-elastomer/PNIPAm hydrogel composite with integrated actuating and sensing performances. Due to the excellent photothermal effect of CNTs and thermo-responsiveness of PNIPAm, under the NIR irradiation, the PNIPAm hydrogel layer would shrink and the bilayer composite would thus perform a bending deformation. At the same time, based on a piezoresistive sensing mechanism of the CNTs-elastomer, the actuating procedure can be recorded. This work may open up a new insight in the designing and fabricating intelligent biomimetic hydrogel soft robots with integrated self-sensing capacity.
研究领域:
材料科学
·
仿生学
·
软体机器人
✓ 已验证
DOI
高影响因子
Nanoscale
·
2025
·
IF 5.1
Jingxuan Li,Jiaqi Miao,Alan Cheng Hou Tsang
Self-regulated actuators harness material intelligence to enable complex deformations and dynamics, representing a significant advancement in automated soft robotics. However, investigations on self-regulated soft actuators, particularly those using simplified actuation modules such as unidirectional light beam, remain limited. Here, we present a design paradigm for self-regulated actuators based on Poly(N-isopropylacrylamide) (PNIPAM) heterogeneous hydrogel, where self-regulated deformations are actuated by a fixed near-infrared laser. By utilizing the different responsiveness of PNIPAM hydrogels and those integrated with reduced graphene oxide (rGO), we develop three heterogeneous hydrogel configurations: up-down, side-by-side, and hybrid. These designs enable complex biomimetic deformations in soft hydrogel actuators, resembling a bending finger or a flexible industrial manipulator, all actuated by a single fixed laser source. These proposed heterogeneous designs and actuation strategies leverage material intelligence to create soft actuators with enhanced autonomy, paving the way for soft automation, adaptive systems, and biomedical applications.
研究领域:
材料科学
·
软体机器人
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 60
·55666-55670
·
IF 3.289
Xiao-Yan Zhang,Yan Zheng,Chun-Hua Liu,Ping-Hua Wang,Yuan-Yuan Zhu
We herein report the synthesis of fluorescent silicon nanoparticles (F-SiNPs) with uniformly small sizes and stable fluorescence, and further preparation of F-SiNPs/poly(N-isopropylacrylamide) (F-SiNPs/PNIPAM) composite hydrogels by in situ polymerization. This type of hydrogel displayed visible thermal-sensitive phase transition properties. Upon heating, the fluorescence intensity of the hydrogels decreased sharply beyond the lower critical solution temperature (LCST) of PNIPAM. The process of fluorescence quenching and recovery was reversible after repeated heating and cooling cycles. This result suggests that the present organic/inorganic hybrid F-SiNPs/PNIPAM hydrogels will have potential applications in visual detection as fluorescence-based temperature sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Chengdong Zhang,Yachen Fei,Meng Li,Jing Li,Maomao Tang,Guichun Wang,Jiaxin Li,Yuxiao Wang,Yang Ding,Chengjun Peng,Mengjie Li,Shuangying Gui,Jian Guo
Periodontitis is an oral chronic inflammatory disease induced by pathogenic bacteria. Pathogens continuously activate immune cells to express a large number of pro-inflammatory factors and reactive oxygen species, eventually leading to periodontal tissue damage. Poor eradication of pathogenic bacteria, persistent inflammatory response and impaired periodontal tissue regeneration are the main challenges to control the progression of periodontitis. However, current clinical drug treatment fails to comprehensively address these issues. In this paper, a chitosan-P407-PNIPAM scaffold multi-crosslinked hydrogel (A/CQ-ML@Gel) encapsulating AgNPs and lipid complex (CQ-ML) is developed. This hydrogel shows thermo- and pH-sensitive properties, exhibits excellent injectability, high viscosity and reliable post-injection mechanical strength. A/CQ-ML@Gel possesses a significant antibacterial effect to Porphyromonas gingivalis after implantation, and then by virtue of the programmed release of quercetin microemulsion and caffeic acid phenethyl ester in CQ-ML, exerting excellent inflammation regulation and osteogenic differentiation of periodontal ligament stem cells. Notably, A/CQ-ML@Gel could activate mitophagy through PINK1/Parkin in inflammatory macrophages, thereby inhibiting the production of excess reactive oxygen species, ultimately reprogramming M1/M2 macrophages phenotype for inflammation suppression. In summary, we present an innovative insight into periodontal delivery system for trimodal synergistic therapy strategy in periodontitis.
研究领域:
口腔医学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Chi Han,Yafeng Jing,Jieling Li,Tianhe Jiang,Sen Liang,Rui Lin,Anhe Wang,Jian Yin,Yong Mao,Shuo Bai
Poly(N-isopropyl acrylamide) (PNIPAM) hydrogel, renowned for its rapid response to temperature changes, has emerged as a promising material for soft electronic and wearable biosensors. However, its practical use in wearable biosensors is hindered by challenges such as poor mechanical strength, limited conductivity, and potential biosafety concerns due to residual polymerization initiators. To overcome these limitations, an edible initiator of Vitamin C is introduced to catalyze the polymerization of NIPAM. This process is further enhanced by the addition of the biocompatible ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIm][Cl]), which accelerates polymerization and improves the hydrogel’s conductivity and mechanical properties. Experimental results demonstrate that the obtained ionic hydrogel holds significant potential for wearable biosensor applications, particularly for monitoring human physiological signals.
研究领域:
材料科学
·
生物医学工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2025
·
IF 2.6
Zhou Zhu,Wei Guo,Shudong Zhang,Nian Li,Min Xi,Jixiang Zhang,Cui Liu,Zhenyang Wang
Smart windows are emerging energy-saving approaches for buildings, dynamically adjusting light transmittance based on weather changes to maintain indoor comfort. However, conventional thermochromic (TC) materials have slow response rates and poor optical sensitivity. Herein, hollow Cu 7 S 4 nanomaterials with broad spectral absorption and high photothermal conversion efficiency are combined with thermoresponsive PNIPAM hydrogel to create a Cu 7 S 4 /PNIPAM hydrogel. This composite enables fast transmittance conversion via photothermal response. The smart window, designed with a glass interlayer, can adaptively adjust transmittance according to real-time light intensity. It is transparent at low light intensity ( T 550 nm = 70.2%) and quickly becomes translucent ( T 550 nm = 39.8%) within 3 min under high light intensity, blocking excess light. This design can reduce indoor temperature by up to 16 °C compared to ordinary glass. Additionally, in cold climates, the smart window can provide heat through photothermal conversion. This approach offers a new way to enhance the performance of traditional TC materials.
研究领域:
材料科学
·
纳米技术
·
光学工程
·
能源效率
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
GOLD BULLETIN
·
2021
·Vol. 54
·期 1
·59-67
·
IF 1.61
Lin Shijun,Jiang Sirui,Zhang Yuchen,Dai Zhengwei,Dai Yu,Xia Fan,Zhang Xiaojin
Gold nanorod (AuNR) nanocomposite hydrogels have attracted increasing attention due to the photothermal effect of AuNRs. However, a facile strategy that avoids multi-step surface modification for synthesis of AuNR crosslinkers is still a critical challenge. Here, AuNRs crosslinking PNIPAM hydrogels were prepared by polymerization of NIPAM with N , N ′-bis(acryloyl)cystamine (BACA)-modified AuNRs as crosslinkers. BACA contains a disulfide bond in the structure. Dynamic and reversible Au-thiolate bonding was formed by directly mixing AuNRs and BACA to facilely prepare AuNR crosslinkers before hydrogel formation. The addition of AuNRs gives hydrogels their photothermal effect and remarkable mechanical behaviors. Hydrogels could repeatedly adhere to the surface of pigskin, metal, plastic, and glass with a relatively stable adhesion. The damaged hydrogels heal within 2 min with near-infrared (NIR) laser (808 nm, 300 mW∙cm −2 ) irradiation. This work provides a line of thinking for improvement of PNIPAM hydrogels, making them promising for further applications in biomedicine.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）