POLYMER TESTING
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2023
·
IF 5.1
Yanan Wang,Lijie Huang,Xiyue Wang,Xuyang Lu,Beiwei Wang,Yafei Qin,Chongxing Huang
Self-healing shape memory polymers (SMPs) have considerablepotential in advanced manufacturing and biomedical fields. Polypyrrole (PPy) exhibits excellent photoconversion properties, which may be utilized in SMP formulation; however, its application in this regard has not been explored. In this study, PPy-filled polymer nanocomposites were prepared to investigate their shape memory and self-healing characteristics. First, poly(lactic acid) (PLA) and polycaprolactone (PCL) were blendedto form PLA/PCL shape memory matrices. An 80:20 PLA/PCL blend showed excellent triple-shape memory performance with shape recovery rates ( R r 1 , R r 2 , and R r 3 R r ) of 92%, 87%, and 93%, respectively PPy nanoparticles were then incorporated into the blend as photothermal conversion fillers to develop photoresponsive SMPs. SMPs. The resulting PLA/PCL/PPy nanocomposites exhibited elevated surface temperatures during near-infrared (NIR) irradiation, thus demonstrating the photoconversion effect. In addition, these nanocomposites showed reversible triple-shape change behavior and excellent self-healing efficiencies upon NIR exposure, owing to the controllable melting and recrystallization of the PLA and PCL phases. Furthermore, the material properties of severed nanocomposites were restored after self-healing. These results, in addition to the biocompatibility and simple fabrication process of these materials, therefore demonstrate the potential utility of PPy-filled SMPs in several applications, including soft robotics and biomedical devices.
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DESALINATION
·
2023
·
IF 9.9
Mengni Ge,Zhuohui Jia,Yan Yang,Ping Dong,Chao Peng,Xi Zhang,Raf Dewil,Yan Zhao,Bart Van der Bruggen,Jianfeng Zhang
Although thin-film nanocomposite (TFN) membranes have been proposed as a competitive approach for improved reverse osmosis performance within the last decade, their intrinsically poor organic-inorganic interfacial compatibility and low durability still hinder further upscaling. In this study, a new in situ assembly strategy is proposed to solve this dilemma by using polypyrrole (PPy) to build a bridge between polyamide matrix and nanomaterial (graphitic carbon nitride, g-C 3 N 4 ) and further fabricate g-C 3 N 4 /PPy-incorporated TFN membrane. The synthesized g-C 3 N 4 /PPy nanocomposites are hybridized into the interfacial polymerization process, which endows the TFN membrane with a smaller “ridge-valley”, higher hydrophilic and thinner polyamide layer. With 0.005 wt% of g-C 3 N 4 /PPy, the water permeability of TFN membrane is increased to 377 % (4.0 L·m −2 ·h −1 ·bar −1 ), while keeping a similar NaCl rejection (99.1 %) to pure polyamide membrane. Importantly, the resulting TFN membrane exhibits high chlorine resistance in acidic, neutral and alkaline environments . Moreover, the TFN membrane has superior antifouling performance for organic, inorganic and mixed organic-inorganic foulants, which is of vital importance for the long service life of TFN membranes. This study offers a facile avenue to solve the application needs of advanced TFN membranes for efficient desalination with stable high-quality water.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yanmeng Cai,Wen Zhang,Jinsheng Zhao,Yue Wang
Prussian blue analogues (PBAs), as the representative of Faradaic materials, has drawn extensive attention in capacitive deionization (CDI) for unique redox activity, open framework structure, and low-cost synthesis. However, the serious aggregation, low conductivity, and easy structural collapse of PBAs nanoparticles limit the practical application in CDI. Herein, the ternary composite Ni,Co-PBA@MXene/PPy is flexibly constructed by integrating the collective advantages of Ni,Co-PBA, MXene, and PPy. In this configuration, MXene not only provides high conductivity but also acts as the good substrate for the in-situ homogeneous growth of Ni,Co-PBA nanoparticles. Furthermore, Ni,Co-PBA nanoparticles could effectively inhibit the self-stacking of MXene and facilitate fast ion intercalation. And the doping of Co in Ni,Co-PBA promotes the redox process by the pseudocapacitive contribution. Meanwhile, PPy contributes to accelerating ions transport rate and promoting the structural stability of MXene and Ni,Co-PBA. Consequently, the hybrid CDI cell AC//Ni,Co-PBA@MXene/PPy delivers prominent desalination performance with the high salt adsorption capacity (38.7 mg g −1 ), rapid salt adsorption rate (10 mg g −1 min −1 ), low energy consumption (0.283 kWh kg −1 -NaCl), and outstanding cyclic stability. Most importantly, the Ni,Co-PBA@MXene/PPy electrode can reserve favorable structural integrity by the significant shielding effect of PPy to prevent Ni,Co-PBA from collapse and MXene from being oxidized.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 15
·5208-5216
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IF 6.4
Mufang Li,Qing Shu,Xing Qing,Jianmei Wu,Qing Xiao,Kangyu Jia,Xungai Wang,Dong Wang
A bioinspired organic electrochemical transistor (OECT) with synaptic and sensing functions has shown great potential in wearable neuromorphic electronics and brain-like sensory systems. Despite the extraordinary progress in simulating neuromorphic functions, it is still difficult to design a synaptic OECT with a bionic structure, long-term durability, low energy consumption and biomarker monitoring capability. Here, a fibrous OECT (FOECT) constructed from functional boron nitride (FBN)-mediated polypyrrole (PPy) neurofibers and an ion-gel dielectric is proposed for the first time. Benefiting from the porous and consecutive PPy nanonetwork, the synaptic FOECT shows a large on–off current ratio (1.46 × 104) and high transconductance (24.6 mS). Key synaptic features, such as excitatory/inhibitory postsynaptic current (EPSC/IPSC), paired-pulse facilitation/depression (PPF/PPD), short-term plasticity (STP) and cyclic endurance (4000 cycles) were successfully emulated. A low power consumption of 0.85 pj per spike was attained due to the short energy dissipation pathway of the nanostructured PPy channel. In addition, a high surface area and big transconductance guaranteed the FOECT a linear detection region (coefficient R2 = 0.966) towards 10 pg mL−1–0.2 mg mL−1 of C-reactive protein (CRP) with good reproducibility. Hence, this work details a promising strategy for next-generation smart textiles with energy-efficient neuromorphic computing and high-performance synaptic devices.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yongchang Tian,Rong Zhang,Binbin Guan,Yaowei Zhu,Li Chen
The compounding of polysaccharide macromolecules and antibacterial agents always has been the preferred strategy to prepare antibacterial products, attracting increasing interest. Herein, a novel acid-responsive oxidized dextran-based nanoplatform ( OTP NP ) has been fabricated for photodynamic antibacterial therapy by combing photosensitizer monoaminoporphyrin ( TPP-NH 2 ) with oxidized dextran ( ODex ) via the Schiff Base reaction. OTP NP of about 100 nm is composed of an inner hydrophobic core of 30 nm and peripheral polysaccharide macromolecules . The OTP NP killed 99.9 % of E. coli and S. aureus within 1.5 light cycles at a concentration of 200 μg/mL. Concurrently, OTP NP exhibited excellent cytocompatibility at a concentration of 1 mg/mL (about 5 folds bactericidal concentration). Particularly, except for the recognized antibacterial mechanism of photodynamic therapy, a novel mechanism of bacterial membrane damage was discovered: the bacterial cell membrane was peeled off and formed spherical particles that aggregated around the bacteria to accelerate bacterial apoptosis under the combined action of ROS and nanomaterials. Moreover, the slightly soluble drug levofloxacin ( Lev ) as a model drug was loaded into OTP NP to test its carrier function, providing a practicable strategy to design multifunctional polysaccharide-based photodynamic antibacterial materials.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Wenjing Yu,Gaofeng Shao
Graphene with abundant defects has been considered as the most lightweight electromagnetic functional materials . Although important, the dominant electromagnetic response of defective graphene with diverse morphologies is rarely the focus of existing research. Herein, the defective graphene with two-dimensional planar structure (2D-ps) and three-dimensional continuous network (3D-cn) morphologies were dexterously designed with 2D mixing and 3D filled systems of polymeric matrix. A comparison between the topologies of defective graphene-based nanofillers and the microwave attenuation behaviors was examined. Defective graphene with 3D-cn morphology can achieve ultralow filling content and broadband absorption, which is attributed to the presence of numerous pore structures that promote impedance matching, induce continuous conduction loss and provide multiple reflection and scattering sites for electromagnetic wave attenuation. Comparatively, by virtue of the increased filling content of 2D-ps, the dielectric losses primarily originate from the dielectric genes, including aggregation-induced-charge transport, abundant defect and dipole polarization, resulting in good microwave absorption at low thickness and low frequency. Therefore, this work provides a pioneering insight into morphology engineering of defective graphene microwave absorbers, and it will guide future exploration of customizing high-performance microwave absorption materials based on graphene-based low-dimensional building blocks.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Qinglu Li,Ruihua Tang,Hao Zhou,Xuxu Hu,Sufeng Zhang
With the development and popularity of portable electronic devices, there is an urgent need for flexible energy storage devices suitable for mass production. We report freestanding paper electrodes for supercapacitors fabricated via a simple but efficient two-step method. Nitrogen-doped graphene (N-rGO) was first prepared via a hydrothermal method . This not only obtained nitrogen atom-doped nanoparticles but also formed reduced graphene oxide . Pyrrole (Py) was then deposited on the bacterial cellulose (BC) fibers as a polypyrrole (PPy) pseudo-capacitance conductive layer by in situ polymerization and filtered with nitrogen-doped graphene to prepare a self-standing flexible paper electrode with a controllable thickness. The synthesized BC/PPy/N 15 -rGO paper electrode has a remarkable mass specific capacitance of 441.9 F g −1 , a long cycle life (96 % retention after 3000 cycles), and excellent rate performance. The BC/PPy/N 15 -rGO-based symmetric supercapacitor shows a high volumetric specific capacitance of 244 F cm −3 and a max energy density of 67.9 mWh cm −3 with a power density of 1.48 W cm −3 , suggesting that they will be promising materials for flexible supercapacitors.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Huaiyu Li,Chenxi Xu,Wei Wang,Gangyong Li,Junlin Huang,Liang Chen,Zhaohui Hou
The development of single atom catalysts is considered as a hotspot in the field of electrocatalysis. As the representative of single atom catalysts, metal and nitrogen co–doped carbon (M N C) attracts worldwide attentions due to its great potential in the application of oxygen reduction reaction (ORR). However, the actual preparation of M N C still confronts with tedious procedure, harsh condition and relatively low loading of single metal atom. In this work, we successfully prepare high–loading 3D Co N C architecture by a facile oxidation polymerization followed by pyrolysis process employing 3D nitrogen–doped graphene hydrogel (NGH) and pyrrole (PY) as the reaction precursors. Benefitting from the individual advantages of 3D NGH and PY, the resultant 3D Co N C possesses unique 3D architecture, high–loading single Co atom (2.74 wt%), large specific surface area and enriched mesopores, which benefit the exposure of sufficient catalytic sites and facilitate electrons transfer and ions transport, thus generating much enhanced ORR performance. When used as the cathode catalyst for zinc–air batteries (ZABs), it shows comparable performance with commercial Pt/C catalyst. Clearly, our finding offers a good guidance on the design and synthesis of advanced high–loading single atom catalysts.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Shengliang Wang,Haixu Chen,Zhijun Xu,Xiaoliang Wang,Zhengyu Tao,Lei Wang,Xiaoman Liu,Xin Huang
Cell surface engineering is an effective strategy to improve the tolerance of living cells against harsh environments as well as endow cells with various properties and functionalities, which they do not possess inherently. However, the research emphasis on single-cell surface engineering with the emergence of collective functionality is still rare. In this study, we encapsulate a single living cell with TiO2 nanoparticles (Degussa P25, composed of anatase and rutile crystallites) and conductive polymer polypyrrole (PPy). The driving force generated from the nanoparticles TiO2 and PPy could be utilized to manipulate cells that are more than a hundred times their own body size. Different collective behaviors of unicellular organisms can be achieved under various conditions. Especially, the engineered cells could be endowed with a swarming negative phototaxis migration under UV light in the presence of ferrocene methanol (MFc). Given that the collective behaviors of organismic swarms can greatly improve the adaptability and survivability compared to individual ones, we thus anticipate that such a studied technique could open up opportunities for the manipulation of the collective behaviors of unicellular organisms and have great potential in cell therapy as well as biosensors.
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Environmental Science-Nano
·
2023
·Vol. 10
·期 5
·1284-1296
·
IF 7.3
Yuxuan Lin,Weihua Qin,Yuwei Lu,Mingye Ren,Pan Gao,Feng Xiao,Shaoxia Yang
Improving the performance of single-atom catalysts (SACs) is still challenging in Fenton-like reactions for degrading refractory organic pollutants. Here, we designed P and N co-doped Fe SACs to regulate the electronic structure of Fe active sites and enhance the reaction kinetics of peroxymonosulfate (PMS) activation. The obtained heteroatom-doped Fe SACs for the first time exhibited an ultra-low activation energy (ca. 3.7 kJ mol−1) and excellent degradation efficiency for bisphenol A (BPA) in a wide pH range (4.3–9.2). The superior reaction kinetics of the Fe SACs were attributed to enriching the electron density of atomic Fe and then forming dual electron-rich/-deficient sites, which accelerated the electron transformation to generate reactive oxygen species (ROS). In this study the heteroatom-doped Fe SACs with rapid reaction kinetics are achieved, and provides an idea to design SACs with superior performance in heterogeneous Fenton-like reactions.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 14
·7711-7723
·
IF 11.9
Min Wang,Xuezhong Zhang,Chuanliang Chen,Yong Wen,Qichao Wen,Qiang Fu,Hua Deng
Solar-powered interfacial water evaporation is thought as a promising strategy for clean water production to tackle global water pollution and scarcity. Nevertheless, the water evaporation rate under all-weather conditions still needs to be improved. Herein, we report an effective approach to develop an integrated photo-electro-thermal steam generation system consisting of aramid-based aerogels that illustrate high evaporation rate under 1 sun (1 kW m−2) illumination and can also carry out water evaporation effectively in low-light or dark environments. The porous aerogel evaporators with high conductivity are composed of aramid nanofibers (ANFs) and carbon nanotubes (CNTs) coated with in situ synthesized polypyrrole (PPy). Based on the photo-thermal effect and electro-thermal effect simultaneously, the evaporators ensure efficient all-weather water production. The evaporation rate of the photo-electro-thermal system reaches 4.71 kg m−2 h−1 with 1 sun radiation and an input voltage of 5 V, while the rate is 2.81 kg m−2 h−1 under only 1 sun illumination. Meanwhile, the system also shows promising potential in salt tolerance and dye wastewater treatment.
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Small
·
2023
·Vol. 19
·期 21
·2300233
·
IF 13.3
Tian Li,Jinzhe Li,Zhengkan Xu,YingRui Tian,Jiatong Li,Jiani Du,Fanbin Meng
Nowadays, the rapidly development of advanced antidetection technology raises stringent requirements for microwave absorption materials (MAMs) to focus more attention on wider bandwidth, thinner thickness, and lower density. Adding magnetic medium to realize broadband absorption may usually result in the decline of service performance and accelerating corrosion of MAMs. Chiral MAMs can produce extra magnetic loss without adding magnetic medium due to the unique electromagnetic cross polarization effect. However, more efforts should be taken to furtherly promote efficient bandwidth of chiral MAMs and reveal attenuation mode and modulation method of chiral structure. Herein, a novel superhelical nano-microstructure based on chiral polyaniline and helical polypyrrole is successfully achieved via in situ polymerization strategy. The enhanced multiscale-chiral synergistic effect contributes to broaden effective absorption bandwidth, covering 8.6 GHz at the thickness of 3.6 mm, and the minimum reflection loss can reach −51.3 dB simultaneously. Besides, to further explain response modes and loss mechanism of superhelical nano-microstructures, the electromagnetic simulation and test analysis are applied together to reveal their synergistic enhancement attenuation mechanism. Taken together, this strategy gives a new thought of how to design, prepare, and optimize the hierarchical structure materials to achieving broadband and high-performance microwave absorption.
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