MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 307
·期 2
·2100654
·
IF 4.367
Pengfei Yan,Mengya Li,Jie Liu,Yadi Hu,Keyong Tang
Hydrogel is an ideal wound dressing material because of its 3D network structure, which is similar to that of the extracellular matrix. However, it is a challenge to design antibiotic-free hydrogels with both antibacterial activity and enhanced mechanical strength. In this study, a polyvinyl alcohol (PVA) hybrid hydrogel incorporated with molybdenum disulfide@polydopamine@silver (MoS 2 @PDA@Ag) is prepared for rapid killing of bacteria under irradiation with near-infrared (NIR) light. The interpenetration of MoS 2 -based nanoparticles and PVA molecular chain significantly improves the mechanical property of the hydrogel. The hydrogels demonstrate an excellent photothermal effect and antibacterial activity, and the photocatalytic properties are considerably enhanced by Ag doping. The hydrogel exhibits favorable antibacterial activity after irradiation with 808 nm NIR light for 15 min due to the synergistic effect of reactive oxygen species and hyperthermia. Meanwhile, in vitro 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay further demonstrated that all hydrogels are nontoxic when their effects are examined against mouse fibroblasts ( L929 ) cells. In addition, the MoS 2 @PDA@Ag/PVA hydrogel can promote wound healing compared with the pure PVA hydrogel, demonstrating its significant potential in mitigating bacterial infection of wounds.
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Qiang Liu,Hao Li,Ling Kong,Yiming Du,Yunsheng Da,Zhouping Sun,Yong Dong,Yanyan Liu,Hua Wang
Due to the low volatile organic compound (VOC) emissions, waterborne coatings are gaining much attention. However, the weak barrier properties prevent them from being practical. In this study, a novel well-dispersed low-defective the g-C 3 N 4 nanosheets are successfully prepared using urea and polydopamine, followed by the preparation of an extensible bio-inspired coating. The bio-inspired coating comprises of PDA@g-C 3 N 4 nanosheets that are oriented and possess zigzag channels, rendering them impervious to corrosion factors. Electrochemical tests have demonstrated that the bio-inspired coating displays a substantially improved resistance of 1.18 × 10 10 Ω cm 2 , surpassing the pure epoxy coating (6.77 × 10 7 Ω cm 2 ) by three orders of magnitude. Moreover, the excellent corrosion resistance of the bio-inspired coating has been substantiated through salt spray tests. The development of bio-inspired composite coatings presents a novel avenue for investigating the synthesis of waterborne epoxy coatings with exceptional performance.
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
·
IF 6.9
Hanbo Sun,Baolian Niu,Xubo Hao,Shuqi Wang,Na Deng
A novel photothermal conversion microencapsulated phase change material (PDA-MPCM) was successfully prepared, contained n-octadecane (n-OD) as the core material, polymethyl methacrylate (PMMA) as the middle layer, and polydopamine (PDA) as the shell material. The incorporation of PDA enabled PDA-MPCM can obtain excellent photothermal conversion efficiency (73.92 %) and maintain good thermal energy storage capacity (1570 J kg −1 K −1 ). The PDA-MPCM suspension (PDA-MPCMS) prepared by the two-step method has a long time dispersion stability (more than 72 h) and an ultra-low transmittance (close to 0) in the wavelength range of 200–650 nm. To investigate the photothermal conversion ability of suspension, the stuffy bask experiments were carried out under the real sunlight in the direct absorption solar collector (DASC) with PDA-MPCMS. The experimental results showed that the peak temperature rise of 0.10 wt% PDA-MPCMS was 27.80 % higher than that of the base fluid, and the zero-loss collector efficiency reached 93.6 %. The PDA-MPCMS are expected to play an important role in promoting solar applications.
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2021
·
IF 1.556
Yilin Wu,Yan Yan,Jian Lu,Zhixin Yu,Junda Wu,Qianqian Wang,Zhongyi Jiang
A new multifunctional KGM/PDA/PVDF composite membrane was successfully prepared via facile nonsolvent induced phase inversion method. Here, the KGM component consisted of numerous covalent bonds, which could improve the corrosion resistance of membrane materials. The dopamine, as a natural “glue” between PVDF substantial and KGM, is capable of integrating different materials together suitably. The as-prepared membrane possessed superior superhydrophilic/underwater superoleophobic property, great corrosion resistance and antifouling property. The separation efficiency was as high as 99.01%, and could stay relatively stable even in the acid, alkali or high salty environment. Additionally, the membrane had great regeneration performance and could keep stable after 15 cyclic separation, which was appropriate for efficient various oil–water separation process. Moreover, the composite membrane could also effectively separate dyes in different environments and the efficiencies were all more than 91%. All in all, the multifunctional composite membrane with facile preparation method might provide a promising strategy and significant theoretical basis for the efficient separation of oil–water emulsions and dyes.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Zhongji Qu,Yu Wang,Wei Wang,Dan Yu
The fabrication of flexible microwave absorbers with high-performance has become an arduous challenge for applications of anti-electromagnetic pollution and radar stealth technology. Herein, a series of FeCoNiOx-PDA-rGO absorbers were prepared and coated on the surface of pretreated polyimide (PI) fabric with PDA-rGO, and finally by screen printing FeCoNiOx-PDA-rGO/WPU for acquiring robust microwave absorption performance, in which the first layer of treated PI fabric was used as the microwave-reflection layer, the medium microwave absorbing powder and water-based polyurethane (WPU) hybrid coating served as the microwave-absorbing layer, and the outside hydrophobic polydimethylsiloxane (PDMS) layer was utilized as the microwave-transmission layer. The well-designed microwave absorption fabric exhibits excellent performance in the X-band (8.2–12.4 GHz). The minimum reflection loss (RL min ) value of the designed fabric can reach −74.70 dB with a thickness of 3.97 mm. Meantime, almost in the entire X-band, the sample can absorb more than 99% (RL < -20 dB) of incident electromagnetic waves. Besides, the performance can be adjusted by changing the load rate of each microwave absorbing layer to obtain lighter and thinner samples in practical applications. We believe this work will bring new inspiration to the design of flexible and wearable microwave absorbers.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Usman Farooq,Jingguo Zhuang,Xinhai Wang,Shuguang Lyu
The removal of chlorinated hydrocarbons through heterogeneous catalysts from groundwater has become a valuable approach. However, the synthesis of a highly efficient and persistent material especially for trichloroethane (TCA) removal is still immature . In this study, we prepared polydopamine (PDA) embedded Fe/rGO nanocomposite via pH-induced polymerization of dopamine for the degradation of TCA in sodium percarbonate (SPC) system. The experimental outcomes revealed that PDA decorated Fe/rGO not only enhanced the TCA degradation (98%) more economically but also strengthened the stability and recyclability of catalyst compared to bare Fe/rGO. The TEM, XRD, FTIR, XPS and VSM analyses declared the successful preparation of magnetically separable PDA@Fe/rGO nanocomposite. Furthermore, a higher degradation rate of probe compounds in PDA@Fe/rGO/SPC system indicated that PDA decoration improved the formation of active species due to autoxidation of dopamine and reducing capability of PDA. The impact of solution matrix on PDA@Fe/rGO performance elucidated the effect of various species on degradation. The GCMS, TOC analysis and dechlorination experiments validated the formation of non-toxic products and reasonable TOC and chloride ions removal. The PDA@Fe/rGO catalyst can be recycled for six consecutive cycles retaining a 76% along with abundant availability of Fe 2+ and Fe 3+ species validated using XRD and XPS analysis. The enhanced remediation capacity and improved recyclability of PDA@Fe/rGO nanocomposite can serve as a shining star for the practical application of TCA removal in groundwater.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Yongqin Liu,Yunlan Xu,Dengjie Zhong,Haoyang Yao,Yundong Zeng,Nianbing Zhong,Han Luo
In order to enhance the electron transmission rate of photocatalytic fuel cell (PFC), BiVO 4 @PDA-wt% composite was successfully prepared by hydrothermal synthesis and chemical polymerization method, and used to modify TiO 2 /Ti to obtain BiVO 4 @PDA/TiO 2 /Ti photoanode with high efficient visible light-response. The structure, morphology, optical and photoelectrochemical properties of BiVO 4 @PDA/TiO 2 /Ti photoanode were characterized and explored. BiVO 4 @PDA-10 %/TiO 2 /Ti obtained the maximum photocurrent density of 10.68 mA cm −2 at 1.0 V ( vs . SCE) under visible light illumination, which was 4.7 times that of BiVO 4 /TiO 2 /Ti. This is because of its extended π-conjugated electron system, PDA can significantly promote the charge transfer between BiVO 4 and TiO 2. Therefore, the separation of photogenerated electrons and holes in space can be realized, thereby the recombination of photogenerated electron-hole pairs can be reduced and ultimately the photocatalytic performance can be enhanced. With BiVO 4 @PDA-10 %/TiO 2 /Ti photoanode and Cu 2 O/Cu cathode, the visible-light responsive PFC exhibited high organics degradation and electricity conversion performance. Its photocurrent density, maximum power density and Rhodamine B degradation efficiency were 0.42 mA cm −2 , 58.55μW cm −2 and 97.28 %, respectively.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 40
·14235-14243
·
IF 4.39
Qingshan Xiong,Qunling Fang,Kezhu Xu,Guanghui Liu,Min Sang,Yunqi Xu,Lingyun Hao,Shouhu Xuan
Antimicrobial materials are expected to be alternatives for antibiotics against multidrug-resistant bacteria. In this paper, non-spherical α-Fe2O3@Au/PDA core/shell nanoparticles with tunable shapes are synthesized by a one-step in situ oxidation-redox polymerization method toward near infrared light-responsive antibacterial therapy. The thickness and composition of the Au/PDA hybrid shell can be controlled by varying the concentration of HAuCl4 and the dopamine precursor. Owing to the wonderful photothermal characteristics originating from the Au/PDA shell, the spindle α-Fe2O3@Au/PDA core shell nanoparticles exhibit excellent photothermal sterilization effects against both Escherichia coli and Staphylococcus aureus at low concentrations. Meanwhile, the NIR photothermal induced bactericidal performance indicates that α-Fe2O3@Au/PDA hybrid particles with tunable non-spherical shapes possess unique controllable antibacterial effects. As a result, this finding provides a simple strategy for fabricating high performance photothermal antibacterial agents and the final products possess high potential in synergistic antimicrobial therapy.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Qingmiao Wang,Lai Peng,Yuanyu Gong,Feifei Jia,Shaoxian Song,Yanmei Li
Because of the easy-separation, high specific surface areas and rich binding sites, magnetic MoS 2 with nanoscale architectures showed great potential in working as adsorbents for heavy metal ions . However, the general composites of nanoscale MoS 2 and Fe 3 O 4 suffered from the poor stability in acidic solution due to their entire exposures of Fe 3 O 4 to H + , which made it difficult to regenerate the used adsorbents by the general acid treatment. This work reported a facile approach to prepare Fe 3 O 4 @Polydopamine (PDA)-MoS 2 nanospheres via in-situ growth of MoS 2 on the PDA modified Fe 3 O 4 nanospheres. Fe 3 O 4 @PDA-MoS 2 nanospheres possessed a fast adsorption of 2.4076 g/mg·min (Initial concentration of Pb 2+ : 200 mg/L) and high adsorption capacity of 508.9 mg/g at 298 K to Pb 2+ . This was because the specific surface area of MoS 2 grown in-situ on Fe 3 O 4 @PDA was 7.6 times that of the pure MoS 2 , which significantly increased the binding sites of MoS 2 for heavy metal ions. In addition, the as-prepared nanocomposites exhibited not only easy-separation within 120 s by an external magnet, but also long-term stability in strong acid solutions as well as facile regeneration by general acid treatment. The tight PDA layers outside the Fe 3 O 4 nanospheres could work as not only a template for the formation of MoS 2 nanoflowers but also an efficient protective coating for the improvement of the stability of nanocomposites. The findings might open up the possibility of expanding the practical application of nanoadsorbent in environmental remediation.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2014
·Vol. 406
·期 28
·7379-7387
·
IF 3.578
Wang Jing,Liu Shu,Ma Bing,Chen Lina,Song Fengrui,Liu Zhiqiang,Liu Chun-ming
Xanthine oxidase (XOD) catalyzes the metabolism of hypoxanthine and xanthine to uric acid, the overproduction of which could cause hyperuricemia, a risk factor for gout. Inhibition of XOD is a major treatment for gout, and biflavonoids have been found to act as XOD-inhibitory compounds. In this study, ultrafiltration liquid chromatography with photodiode-array detection coupled to electrospray-ionization tandem mass spectrometry (UF-LC-PDA–ESI-MS) was used to screen and identify XOD inhibitors from S. tamariscina . High-performance counter-current chromatography (HPCCC) was used to separate and isolate the active constituents of these XOD inhibitors. Furthermore, ultrahigh-performance liquid chromatography (UPLC) and triple-quadrupole mass spectrometry (TQ-MS) was used to determine the XOD-inhibitory activity of the obtained XOD inhibitors, and enzyme kinetics was performed with Lineweaver–Burk (LB) plots using xanthine as the substrate. As a result, two compounds in S. tamariscina were screened as XOD inhibitors: 65.31 mg amentoflavone and 0.76 mg robustaflavone were isolated from approximately 2.5 g S. tamariscina by use of HPCCC. The purities of the two compounds obtained were over 98 % and 95 %, respectively, as determined by high-performance liquid chromatography (HPLC). Lineweaver–Burk plot analysis indicated that amentoflavone and robustaflavone were non-competitive inhibitors of XOD, and the IC
50 values of amentoflavone and robustaflavone for XOD inhibition were 16.26 μg mL −1 (30.22 μmol L −1 ) and 11.98 μg mL −1 (22.27 μmol L −1 ), respectively. The IC
50 value of allopurinol, used as the standard, was 7.49 μg mL −1 (46.23 μmol L −1 ). The results reveal that the method for systematic screening, identification, and isolation of bioactive components in S. tamariscina and for detecting their inhibitory activity using ultrafiltration LC–ESI-MS, HPCCC, and UPLC–TQ-MS is feasible and efficient, and could be expected to extend to screening and separation of other enzyme inhibitors.
ᅟ
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2015
·
IF 2.912
Yirong Jiang,Shuqin Mao,Weisu Huang,Baiyi Lu,Zengxuan Cai,Fei Zhou,Maiquan Li,Tiantian Lou,Yajing Zhao
Variations of phenylethanoid glycoside profiles and antioxidant activities in Osmanthus fragrans flowers through the digestive tract were evaluated by a simulated digestion model and UPLC/PDA/MS. Major phenylethanoid glycosides and phenolic acids, namely, salidroside, acteoside, isoacteoside, chlorogenic acid, and caffeic acid, were identified in four cultivars of O. fragrans flowers, and the concentration of acteoside was the highest, being up to 71.79 mg/g dry weight. After simulated digestion, total phenylethanoid glycoside contents and antioxidant activities were significantly decreased. Acteoside was identified as decomposing into caffeic acid, whereas salidroside was found to be stable during simulated digestion. According to Pearson’s correlation analysis, acteoside contents showed good correlations with antioxidant activities during simulated digestion (R2 = 0.994, P < 0.01). In conclusion, acteoside was the major contributor to the antioxidant activity of O. fragrans flowers, and salidroside was considered as the major antioxidant compound of O. fragrans flowers in vivo.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Haiyan Zhang,Yitong Chen,Yanhui Wei,Xiaokang Zhang,Hongchao Ma
The development of metal-based redox nanozymes represents a new frontier in pollutant sensing. In this field, designing highly active nanozymes and precisely regulating their enzymatic activity are key challenges. In this work, we report the construction of a copper peroxide@polydopamine (CuO2@PDA) nanozyme with dual enzyme-like activity, mimicking the active centers of laccase and peroxidase. Here, CuO2 acts as the catalytic center, while PDA serves as a carrier to prevent CuO2 aggregation and promotes conversion of CuII/CuI active sites via the reduction effect of its surface catechol groups to complete the catalytic cycle. As expected, the obtained CuO2@PDA nanozyme exhibits significant laccase- and peroxidase-mimetic activities. Moreover, its dual enzymatic activity can be systematically switched by adjusting pH and temperature. Specifically, laccase activity dominates near neutral pH, while CuO2 decomposition into Cu ions and H2O2 at acidic pH triggers peroxidase activity. Similarly, CuO2@PDA exhibits temperature-dependent dual enzymatic activity with peroxidase activity prevailing at low temperatures and laccase activity at high temperatures. According to enzymatic performance and XPS results, a possible catalytic mechanism of the dual enzymatic activity of CuO2@PDA has been proposed. Then, based on the pH-dependent dual enzymatic activity of CuO2@PDA, we constructed a detection system for the isomers of organic pollutants, catechol (CC) and hydroquinone (HQ). The laccase-like activity of CuO2@PDA enables direct oxidation of CC into yellow o-benzoquinone, while HQ discolors the preoxidized substrate generated via the peroxidase-like activity of CuO2@PDA. Moreover, selective sensing for CC and HQ with high sensitivity was achieved in real water samples. This approach can guide the design of nanozymes with multienzymatic activity and unveil their potential uses in environmental pollutant discrimination.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）