CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Zhanjian Liu,Huaiyuan Wang,Xiguang Zhang,Chijia Wang,Chongjiang Lv,Yanji Zhu
In this work, a novel bistratal gas layer structure has been used to enhance the long-term durability of a superhydrophobic surface. The design of this bistratal structure takes inspiration from the wings of the insect Notonecta glauca and a spider web. It is comprised of an underlying semi-interpenetrating array structure and a superficial microfiber network structure. On modification with 1 H ,1 H ,2 H ,2 H -perfluorooctyltriethoxysilane (POTS), the prepared surface demonstrates an excellent superhydrophobicity with a water contact angle (WCA) of 168 ± 1.4° and a sliding angle (SA) of 4 ± 0.5°. The underlying semi-interpenetrating array structure can capture more gas to form a stable underlying gas layer, which enhances its anti-static pressure capability. When the superhydrophobic surface was impacted by a high-pressure water column (250 kPa), the superficial micro fibers network structure acted as a buffer layer to disperse the impact force that spread over the network. The prepared surface with bistratal gas layer structure was thus able to high speed water jetting (22.4 m s −1 ), which is three times the speed of the heavy rain (7–9 m s −1 ) and four times that reported for polysiloxane/multiwalled carbon nanotubes (POS/MWCNTs) surfaces (5.4 m s −1 ). Furthermore, the superhydrophobic surface designed by this method was also shown to possess self-healing and hot-water-repellent (100 °C) capability. These features demonstrate the practical potential of superhydrophobic surfaces with a bistratal gas layer structure.
研究领域:
材料科学
·
表面工程
·
纳米技术
·
仿生学
·
物理化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 46
·26712-26717
·
IF 3.049
Yongzhao Su,Duotian Chen,Siyuan Yang,Shengsen Zhang,Yingju Liu,Yueping Fang,Qiao Zhang,Feng Peng
A photoelectrochemical (PEC) method based on the etching reaction of F ions on the surface of TiO2 nanorod arrays (TNRs) was proposed for the high sensitivity and selectivity detection of F ions. With the increase of F ion concentration, the surface etching reaction on TNR becomes more intense, resulting in the increased number of surface active sites, the reduction of electron transfer resistance, and the increase of photocurrent density. The prepared TNRs as a PEC probe exhibits a good linear relationship between photocurrent increment and the logarithm of F ion concentration in the range from 0.05 to 1000 nM with an ultra-trace detection limit of 0.03 nM for F ion detection.
研究领域:
分析化学
·
环境监测
·
纳米材料
·
电化学传感
·
生物医学工程
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Shaopei Jia,Yanhui Wang,Pengfei Tian,Shuyu Zhou,Haixia Cai,Hongwei Gao,Jianbing Zang
Nitrogen-doped mesoporous carbon (NMC) was synthesized via pyrolysis of cobalt-containing casein obtained by extraction from pure milk with the auxiliary of cobalt ions. The cobalt element in casein promoted specific surface area and N element doping amount of casein-derived porous carbon. The N-doped porous carbon obtained by carbonization at 800 °C (NPC-800) possessed a specific surface area of ∼886.7 m 2 g −1 , and the mesoporous size was centered at 2.7 and 7 nm. X-ray photoelectron spectroscopy analysis showed that the nitrogen content of NPC-800 was 3.29 at%. The NPC-800 was explored as a symmetric supercapacitor, which exhibited specific capacity of 380 F g −1 at a current density of 0.5 A g −1 , 218 F g −1 at a current density of 20 A g −1 , and high capacitance retention of 91.3% after charging/discharging 5,000 cycles.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
·
碳材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·Vol. 44
·期 3
·1586-1596
·
IF 4.229
Tianyu Zhao,Zipeng Xing,Ziyuan Xiu,Zhenzi Li,Shilin Yang,Qi Zhu,Wei Zhou
TiO 2-x /g-C 3 N 4 /CdS ternary heterojunctions are fabricated through thermal polymerization-chemical bath deposition combined with in-situ solid-state chemical reduction approach. The prepared materials are characterized by X-ray diffraction, Fourier transform infrared spectra , scanning electron microscopy, transmission electron microscopy , nitrogen adsorption-desorption, and X-ray photoelectron spectroscopy. The results show that the ternary heterojunctions are formed successfully and CdS quantum dots (QDs) and TiO 2 are anchored on surface of g-C 3 N 4 nanosheets simultaneously. The visible-light-driven photocatalytic degradation ratio of Bisphenol A and hydrogen production rate are up to 95% and ∼254.8 μmol h −1 , respectively, which are several times higher than that of pristine TiO 2 . The excellent visible-light-driven photocatalytic activity can be ascribed to the synergistic effect of TiO 2−x , g-C 3 N 4 and CdS QDs which extend the photoresponse to visible light region and favor the spatial separation of photogenerated charge carriers.
研究领域:
材料科学
·
光催化
·
纳米材料
·
环境催化
·
能源化学
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 3
·158
·
IF 1.784
Gao Dong-Sheng,Gao Xiang-Dong,Wu Yong-Qing,Zhang Tong-Tong,Yang Jing-Nan,Li Xiao-Min
Co doped BaSnO 3 films [BaSn 1 − x Co x O 3 (0 ≤ x ≤ 0.50), i.e., BSCO] have been grown on MgO single-crystal substrates via pulsed laser deposition. Effects of the Co-doping level on the crystallinity, the microstructure, and optical properties of the BSCO films are investigated. All the BSCO films are of high crystallinity and grown epitaxially on MgO substrates. The lattice parameter of the (200) plane drops linearly with the increase of the ‘ x ’ value. The Co doping is found to increase the film roughness and the grain size, and a RMS roughness of 8.33 nm and grain size up to 100 nm are observed in the film with x = 0.50. The low Co-doping level ( x = 0.05, 0.1) has slight anti-reflection effects on the incident visible light, and the Co-doping level higher than 0.2 reduces the optical transmittance significantly. The optical bandgap shows a first-rising then falling trend with the increase of the Co content, and the lowest bandgap of 1.94 eV is realized in the BSCO film with x = 0.50.
研究领域:
材料科学
·
凝聚态物理
·
薄膜制备
·
光学材料
·
功能氧化物
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yan-zhen Shen,Xun-liang Wang,Yu-xiang Jia,Meng Wang
The endowment of perm-selectivity for specific ions will further extend the applications of heterogeneous membrane. In this work, a side-chain type weak cationic polyelectrolyte, PVDF-g-PVP, was synthesized for surface hydrophobilization of heterogeneous anion-exchange membrane (AEM) in order to impart perm-selectivity between specific anions with different Gibbs hydration energy. After microstructure observation and chemical composition analyses by SEM, AFM, EA and FTIR, the perm-selectivity between specific anions, electrical resistance, transport number, limiting current density, surface homogeneity, as well as salt permeability of the modified AEMs were investigated. Series of electrodialysis experiments in SO 4 2– /Cl – system indicated that a significant perm-selectivity was indeed achieved by the attachment of PVDF-g-PVP coating. In particular, it was worth noting that only a small loss of membrane conductivity was observed after the functionalization. This should be closely related to the micro-phase separation morphology of the coating layer which was induced by the polarity difference between the main chains and side chains of PVDF-g-PVP. Besides, the chronopotentiometric analyses indicated surface homogeneity of the heterogeneous AEM was significantly enhanced and then effectively ameliorated concentration polarization behaviors at the membrane-solution interface. Meanwhile, the perm-selectivity for co-ions was also improved and suppressed back diffusion behaviors of salt driven by concentration gradient. In brief, the modifying scheme proposed in this work can effectively improve comprehensive transport properties of conventional heterogeneous AEM.
研究领域:
膜科学与技术
·
高分子材料化学
·
分离科学
·
电化学工程
·
功能材料
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Hui Li,Lincai Peng
To confer cellulose fibers antimicrobial and antioxidant activities, chitosan (CS)/lignosulfonates (LS) multilayers were constructed on fibers surfaces through layer-by-layer deposition technique. The formation of CS/LS multilayers on cellulose fibers surfaces was verified by X-ray photoelectron spectroscopy (XPS) and zeta potential measurement. The surface morphologies of CS/LS multilayers on fibers surfaces were observed by atomic force microscopy (AFM). The results showed that characteristic element (i.e. N and S element) content increased with increasing bilayers number, the surface LS content increased linearly as a function of bilayers. Zeta potential of modified fibers was inversed after deposition of each layer. AFM phase images indicated that the cellulose microfibrils on fibers surfaces were gradually covered by granular LS aggregate. The antimicrobial testing results demonstrated that CS/LS multilayers modified fibers with CS in the outermost layer exhibited higher antimicrobial activity against Escherichia coli . The antioxidant testing results showed that antioxidant activity of CS/LS multilayers modified fibers was better than that of original fibers under the same oxidation conditions.
研究领域:
高分子材料
·
表面科学
·
生物医学工程
·
功能材料
·
纳米技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Dan Wu,Mengnan Hu,Yongyi Zhang,Jing Zhou,Zhaona Wang
Surface enhanced Raman spectroscopy (SERS) is a key nondestructive detecting technology with a broad application demands. However, relative low stability and homogeneity of the SERS substrate hinder its practical applications. Here, a simple and flexible approach is proposed to achieve the arrayed SERS substrates with the periodicity and local randomness by directly growing silver nanoflowers on the patterned wafer fabricated by the optical interference method. By utilizing the hotspot effect of nanogaps within/between the Ag nanoflowers, the SERS substrates demonstrate the low detecting limit of 5 × 10 −10 M and 5 × 10 −9 M in one-dimensional (1D) and two-dimensional (2D) pattern structures for Rhodamine 6G (R6G) probe molecule, respectively. The periodicity assures the fabricated substrate a promising reproducibility and stability. After the 1D array structure is left for 21 days, the intensity of Raman signal of R6G maintains at 80%. Moreover, the proposed method has the advantages of simple preparation, low cost, flexible tunability, and easy-fabrication large scale substrate. The results indicate that the long-range ordered silver nanoflower array structures are promising candidates for the high performance SERS substrate in chemical analysis, medicine and environment monitoring.
研究领域:
分析化学
·
纳米生物技术
·
材料科学
·
环境监测
·
医学检测
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Qiang Huang,Meiying Liu,Junyu Chen,Ke Wang,Dazhuang Xu,Fengjie Deng,Hongye Huang,Xiaoyong Zhang,Yen Wei
Surface modification of nanomaterials with polymers is an effective route to render new functions and improve the performance of the final nanocomposites. Here, a facile method was developed to fabricate polyacrylic acid (PAA)-grafted monodisperse SiO 2 nanoparticles (SiO 2 -PDA-PAA) through a combination of mussel inspired chemistry and Michael addition reaction. To obtain the products, the SiO 2 nanoparticles were first coated with polydopamine (PDA) through self-polymerization of dopamine under rather mild conditions. The PDA thin films can then be further conjugated with amino-terminated PAA, which was synthesized by chain transfer free radical polymerization using cysteamine hydrochloride as a chain transfer agent and acrylic acid as a monomer. The SiO 2 -PDA-PAA nanocomposites were characterized via transmission electron microscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis, and X-ray photoelectron spectroscopy. The effects of contact time, solution pH, temperature and methylene blue (MB) concentration on the removal of MB were investigated. The results demonstrated that SiO 2 -PDA-PAA showed significant improvement in adsorption efficiency towards MB. The kinetics and isotherm studies showed that pseudo-second-order and Langmuir isotherm models were well fitted the experimental data. The values of thermodynamics parameters such as entropy change ( ΔS 0 ), enthalpy change ( ΔH 0 ) and Gibbs free energy ( ΔG 0 ) were calculated based on the Van’t Hoff equation. The negative values of thermodynamic parameters indicated that the adsorption of MB was a feasible, spontaneous and exothermic process. In summary, we developed a facile method to fabricate SiO 2 -based polymer nanocomposites, which showed obviously enhanced adsorption capability towards MB.
研究领域:
材料科学
·
环境化学
·
纳米技术
·
高分子化学
·
胶体与界面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR RECOGNITION
·
2016
·Vol. 30
·期 1
·e2566
·
IF 2.091
Hua-jin Zeng,Min Miao,Ran Yang,Ling-bo Qu
In this study, the fibrillation of hen egg-white lysozyme (HEWL) in the absence and presence of different concentrations of silybin was studied by thioflavin T spectroscopy, Congo red binding assays, 8-anilino-1-naphthalenesulfonic acid (ANS) fluorescence assay, circular dichroism, and transmission electron microscopy. The experimental results indicated that not only the fibrillation of HEWL at high temperature (65°C) and low pH (pH = 2.0) could be inhibited effectively by silybin but also the inhibition of HEWL by silybin followed a dose-dependent manner. Molecular docking studies indicated that 2 possible binding modes could be found in the interaction between silybin and HEWL via van der Waals forces and electrostatic forces as well as hydrogen bonding. One of these 2 conformations was directly entered into the cavity of HEWL (binding site I); the other was bound to the surface of HEWL (binding site II). In this way, silybin could not only increase the hydrophobicity of the cavity or the surface of HEWL but also influence the microenvironment of the binding site, which was able to stabilize the structure of HEWL and delay the process of HEWL fibrosis.
研究领域:
生物化学
·
分子生物学
·
蛋白质科学
·
药理学
·
结构生物学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 43
·34199-34205
·
IF 3.84
Ren Liu,Junchao Zheng,Zhiquan Li,Jingcheng Liu,Xiaoya Liu
A facile method to prepare surface self-concentration antibacterial coating with contact-killing mechanism was developed. Photo curable quaternary ammonium compound QAC bearing a 16-carbon alkyl chain and a terminal methacrylate was synthesized as reactive antibacterial additive. After UV irradiation, QAC was crosslinked in the soy-based coating matrix. With proper amounts of QAC, the UV cured coatings exhibited good properties such as high glossiness, good hardness and fine adhesion to cherrywood substrates. The self-concentration property of QAC on the cured coating surface, which is beneficial to reserve the physical properties of the bulk materials and to improve the surface antibacterial activity, was confirmed by fluorescence and X-ray photoelectron spectroscopy. Moreover, the introduction of QAC provided the coatings with superhydrophilicity property as well as good anti-fog capacity. The coatings with 8 wt% of QAC (charge density = 8.6 mol cm−2) exhibited almost 100% antibacterial activity against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli by 5 log reduction. The contact-killing mechanism of coatings was confirmed via the zone of inhibition tests. The straightforward preparation combined with excellent antibacterial property makes the QAC containing coatings quite promising in antibacterial coatings realm and is suitable for industrial-scale manufacturing.
研究领域:
材料科学
·
高分子化学
·
表面工程
·
抗菌材料
·
涂层技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 67
·62675-62679
·
IF 3.289
Yongzheng Wang,Jing Ye,Yu Shen,Mingjiang Xie,Shuangshuang Yang,Chao Liu,Xiangke Guo,Luming Peng,Weiping Ding,Xuefeng Guo
Anatase-type titania with ultrathin nanosheet morphology and sintering-resistant structure was constructed from monolayer titanate nanosheets isolated by uniform silica nanoparticles. The obtained anatase titania nanosheets possess high accessible surface area, ultrathin thickness (∼0.6 nm), dominant (116) facets exposed, wide bandgap and exhibits excellent photocatalytic activity.
研究领域:
材料科学
·
纳米科技
·
光催化
·
无机化学
·
能源材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）