Biomedical Materials
·
2019
·Vol. 14
·期 6
·065012
·
IF 3.44
Chaojing Li,Jifu Mao,Qiwei Li,Fujun Wang,Yongjie Jiao,Ze Zhang,Robert Guidoin,Lu Wang
Surface modification by long-term active component is essential for biocompatible polymers-based vascular grafts to prevent thrombus formation and reduce intimal hyperplasia. In this study, a simple approach was developed to immobilize bioactive heparin to the surface of ε-polycaprolactone (PCL) grafts through a two-step strategy combining covalent grafting and layer by layer assembly of polyelectrolytes. The performance of heparinized PCL was evaluated in vitro, including the release behavior of heparin, anticoagulation and different types of cells adhesion characteristic. A sustained-release of heparin was achieved by this immobilization strategy. Surface remaining heparin was up to 1.10 μg cm−2 on the modified PCL after release in vitro for 30 d. Specifically, the heparinized PCL has the long-term ability to prevent adhesion of blood cells and thrombus formation, and significantly inhibit the adhesion of smooth muscle cells. The two-step strategy provides a simple and general route to incorporate heparin on PCL graft surface. The surface heparinized PCL demonstrated in this work can be a useful material platform for biodegradable vascular stent graft.
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Nano Energy
·
2012
·
IF 0
Junfeng Xie,Xu Sun,Ning Zhang,Kun Xu,Min Zhou,Yi Xie
With the dramatic development of portable electronics, power sources with ultrathin geometries and ultraflexibility have become an important prerequisite. In this rising field, all-solid-state thin-film supercapacitors (ASSTFSs) have received tremendous attentions due to their ultraflexibility and high safety, which are considered as competitive candidates for energy supplies in flexible electronics. However, state of the art for ASSTFSs based on carbonaceous materials and conducting polymers exhibits relatively low capacitance, which restricts their practical applications. In this study, we demonstrate the first successful application of pseudocapacitive transition metal hydroxides in all-solid-state thin-film supercapacitor (ASSTFS), exhibiting high capacitance, remarkable high-rate capability and long-term cycling stability. The free-standing thin-film electrode was fabricated by β-Ni(OH) 2 /graphene nanohybrids with unique layer-by-layer characteristics. The nanohybrids can be easily exfoliated into ultrathin hybrid nanoflakes with thickness of ∼10 nm and reassembled into free-standing thin-film electrode with ultraflexibility. The novel layer-by-layer structure could efficiently integrate both merits of pseudocapacitive β-Ni(OH) 2 and conducting graphene, resulting in extraordinary electrochemical performance in ASSTFSs. The highest specific capacitance of 660.8 F cm −3 for ASSTFSs was achieved with negligible degradation even after 2000 charge–discharge cycles, demonstrating the high-performance electrochemical property and superior cycling stability. And the all-solid-state nature combined with superior electrochemical performance and ultraflexibility makes our device an outstanding candidate for power sources in portable electronics.
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Journal of Physical Chemistry C
·
2012
·
IF 4.805
Maiyong Zhu,Ying Wang,Dehai Meng,Xingzhang Qin,Guowang Diao
A simple hydrothermal process for fabrication of hematite (α-Fe2O3) nanostructures with narrow size distribution was developed by using PVP as surfactant and NaAc as precipitation agent. The influence of experimental parameters including the concentration of the precursor, precipitation agent, stabilizing agent, and reaction time was systematically investigated to study the possible formation mechanism of α-Fe2O3. Finally, the electrochemical properties of the obtained hematite particles were studied using cyclic voltammetry and galvanostatic charge–discharge measurement by a three-electrode system. The results reveal that their specific capacitances are related to their sizes. By virtue of large surface area, the as-prepared hematite nanoparticles can present the highest capacitance (340.5 F·g–1) and an excellent long cycle life within the operated voltage window (−0.1 to 0.44 V), demonstrating that the as-prepared hematite nanoparticles can serve as one of the most excellent electrode materials for supercapacitors.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Chang Wang,Shihao Zhou,Yue Tian,Anxin Jiao,Hui Ma,Mengya Zhang,Linqi Zheng,Xiangdong Liu,Qingqiang Cui,Shuang Li,Ming Chen
The powerful surface-enhanced Raman scattering spectroscopy (SERS) practical technique is not only related to signal enhancement but also heavily dependent on spatial uniformity. Different from the routine hydrophobic substrates, an extraordinary super-hydrophilic SERS sensor is established by loading plasmonic Au nanoparticles (NPs) on two-dimensional (2D) hexagonal boron nitride (h-BN) then the hybrids uniformly are grafted into 3D bacterial nanocelluloses (BNCs). The Au NPs@h-BN/BNCs exhibit a remarkably high SERS activity with a limit of detection (LOD) of dyes at 0.1 femtomole (fM) level (∼10 -16 M). It is attributed to the strong synergistic coupling effect between highly dense Au NPs and modified h-BN as well as multiple light-scattering effects in 3D porous supports. More importantly, the distinctive advantage is further highlighted by the exceptional 3D spatial SERS uniformity with relative standard deviation (RSD) less than 3.4% along both horizontal and vertical directions. The unique feature is due to the 3D homogeneous distribution of the injected colloidal analytes via ultra-rapid liquid diffusion throughout the entire body with superior wettability . Besides, the flexible SERS substrates with excellent easy-tailorable mechanical properties can be robust enough to withstand the portable operations in real-world scenarios. These competitive merits are particularly beneficial for reliable SERS quantitative surveillance.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2012
·
IF 1.693
Yang Lu,Juan Han,Zhenjiang Tan,Yongsheng Yan
The phase diagrams for the systems containing polyoxyethylene lauryl ether (Brij35) and K2HPO4/(NH4)2HPO4 have been determined experimentally at three temperatures, (288.15, 298.15, and 308.15) K. Three experiential equations were used to correlate the binodal data. The liquid–liquid equilibrium (LLE) data of these systems obtained by the experimental method were fitted by using Othmer–Tobias and Bancroft along with simple Setschenow-type equations. Furthermore, the effect of temperature on the binodal curve for the disquisitive systems has been discussed, and it was found that two-phase region expands with the increase in temperature, which is corresponded to the value of the effective excluded volume (EEV) calculated according to the binodal model. In the investigated systems, the free energy (ΔG), enthalpy change (ΔH), and entropy change (ΔS) were calculated, and it indicated that the phase separation processes are endothermic and driven by the entropy increase. That the slope of tie-line increases with the rising temperature was mainly caused by the hydrophobicity of Brij35 which changes with the temperature being varied.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Tian Xie,Jie Ding,Xiaofang Shang,Xiaoqiao Zhang,Qin Zhong
Tandem catalysts consisting of metal oxides and zeolites have been widely studied for catalytic carbon dioxide (CO 2 ) hydrogenation to lower olefins , while the synergies of two components and their influence on the catalytic performance are still unclear. In this study, the composite catalysts composed of indium oxide loaded with zirconia (In 2 O 3 /ZrO 2 ) and silicoaluminophosphate molecular sieve number 34 (SAPO-34) are developed. Performance results indicate that the synergies between these two components can promote CO 2 hydrogenation. Further characterizations reveal that the chabazite (CHA) structure and acid sites in the SAPO-34 are destroyed when preparing In-Zr/SAPO by powder milling (In-Zr/SAPO-M) because of the excessive proximity of two components, which inhibits the activation of CO 2 and hydrogen (H 2 ), thus resulting in much higher methane selectivity than the catalysts prepared by granule stacking (In-Zr/SAPO-G). Proper granule integration manner promotes tandem reaction , thus enhancing CO 2 hydrogenation to lower olefins , which can provide a practicable strategy to improve catalytic performance and the selectivity of the target products.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Xiaolong Zhang,Hui Zheng,Shilei Jin,Yuhong Jiang,Yaxin Wang,Yang Liu
Multifunctional nanocomposites with well-defined structures and optimized electromagnetic properties are highly desirable in surface-enhanced Raman scattering (SERS) and catalytic reduction reactions. We report a novel multifunctional Fe 3 Pt–Ag nanoparticle with efficient SERS performance and excellent catalytic activity. Fe 3 Pt–Ag shows an obviously enhanced SERS effect, which is evaluated by enhanced Raman signal of Rhodamine B (RhB). Efficient SERS performance of Fe 3 Pt–Ag is attributed to the optical property of local surface plasmon resonance of Ag nanoparticles (NPs). Importantly, spontaneous catalytic reduction reactions of RhB illustrate that Fe 3 Pt–Ag possesses good catalytic performance. In combination with the theories of pseudo-first-order kinetics, catalytic reduction reactions are analysed in detail, and experimental data are in line with theoretical results. Fe 3 Pt–Ag can be easily recycled at least six times via an external magnetic field , elaborating that our developed Fe 3 Pt–Ag can be applied to protect environment as a novel composite material.
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MATERIALS & DESIGN
·
2017
·
IF 4.364
Yu-Ting Zhuang,Wei Gao,Yong-Liang Yu,Jian-Hua Wang
The design and preparation of high-performance catalysts with high catalytic activity and excellent durability that are both environmentally benign and cost-effective remains a considerable challenge. Herein, a facile strategy is reported for the fabrication of three-dimensional porous CuFe 2 O 4 cages, shortly as 3D CuFe 2 O 4 @C, by bubbling oxygen produced in situ through a CuFe 2 O 4 suspension, followed by thermal treatment in nitrogen atmosphere. The 3D CuFe 2 O 4 @C structure increases the surface area of CuFe 2 O 4 and provides a porous support structure. It is proposed to be a key in preventing the aggregation of CuFe 2 O 4 during practical use. 3D CuFe 2 O 4 @C is shown to be a highly active catalyst, not only for the hydrogenation of p -nitrophenol, but also for the reduction of methylene blue in aqueous medium . 3D CuFe 2 O 4 @C exhibits remarkable catalytic activity towards p -nitrophenol reduction, with a catalytic rate constant of 2.167 min − 1 that is 5.35 times higher than that with pristine CuFe 2 O 4 (0.405 min − 1 ). In addition, the 3D CuFe 2 O 4 @C catalyst has a high saturation magnetization of 51.9 emu g − 1 , indicating that it can be easily recycled using a magnet. The 3D porous metal oxide nanostructure shows promising potentials as candidates for the remediation of contaminated aquatic environments and meets the demands for addressing future environmental issues.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Li Kang,Liangliang Xu,Zhongkang Han,Haibo Yu,Qiangshun Wu,Mi Wu,Zuming He,Lina Wang,Hanpei Yang
As a structural parameter, dimensionality is a key factor but was usually ignored in the design of novel heterojunction architectures in achieving their photocatalytic performances. Hence in this work, we obtained one-dimensional titanate nanotubes (TNTs), two-dimensional titanate nanoflakes (TNF) and three-dimensional titanate nanospheres (TNS) with facile treatments of TiO 2 by NaOH, and combined them with two-dimensional sulfur-doped g-C 3 N 4 nanoflakes (SCN), respectively, through magnetic and ultrasonic mixing in isopropanol. Their performances in photodegradation of tetracycline hydrochloride (TC-HCl) under simulated solar light irradiation exhibit significant superiorities of the composites over their individuals, while the photodegradation rates obtained on composites indicate a vital importance of their interfacial intimacy in heterojunctions. The photoactivity of TNF/SCN with a suitable face-face contact represents a rate constant as high as 0.1642 min −1 , which is 1.58 and 2.65 times of what on TNS/SCN (0.1036 min −1 ) and TNTs/SCN (0.0619 min −1 ), respectively. Careful characterization and theoretical calculation indicated dense junction between different titanates and SCN via van der Waals integration. In these dense heterojunctions, an internal electronic field of about 0.75 V can automatically be formed between titanates and SCN during the assimilation of their Femi level by electronic coupling, to realize migration and separation of photogenerated carriers through an S-scheme. Moreover, the interfacial intimacy benefited from suitable dimensionality of titanates can promote the efficiency of S-scheme to acquire a prolonged lifetime of •OH and •O 2 – , and intraparticle transfer of TC-HCl towards their degradation. This work provides new insights into the rational design of heterostructures based on dimensional modulation on the interfacial affinity for accelerating the transfer of interfacial charge and the intraparticle transfer of contaminants.
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APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Yong-Ting Li,Shi-Hao Zhang,Guang-Ping Zheng,Pu Liu,Zhi-Kun Peng,Xiu-Cheng Zheng
Hierarchical porous g-C 3 N 4 nanosheets are prepared from melamine using NH 4 Cl as dynamic gas templates to anchor the ultrafine Ru nanoparticles (NPs) with a facile adsorption -in situ reduction strategy. The results reveal that 1: 3 is the optimal mass ratio for melamine to NH 4 Cl and the Ru NPs are evenly dispersed in the porous network of g-C 3 N 4 in the corresponding catalysts. Remarkably, the porous catalysts exhibit superior catalytic activity and satisfactory recyclability for ammonia borane (NH 3 -BH 3 , AB) hydrolysis. The corresponding turnover frequency is as high as 122.2 × 10 3 mL H 2 · g Ru -1 · min -1 and the apparent activation energy (35.6 kJ mol −1 ) is competitive. AB hydrolysis is of 1.17-order and near zero-order with respect to the Ru and AB concentrations, respectively. The results demonstrate that the Ru/g-C 3 N 4 catalysts are promising in developing an alternative clean and environmentally friendly energy carrier from the hydrogen storage materials.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2012
·
IF 1.78
Gang Jian,Dongxiang Zhou,Junyou Yang,Qiuyun Fu
This paper describes the fabrication of CoFe 2 O 4 thick films using the tape casting method from nonaqueous slurry. CoFe 2 O 4 particles with average size of ∼800 nm were prepared by the solid-state reaction method. Sediment volumes and viscosity were tested to study the effects of dispersant in reducing aggregations in slurry. Slurry with 0.25 wt% dispersant amounts and 41.3 wt% solid content showed the optimal stability and rheological properties. A tape velocity of 8 cm/s was used in this study considering the non-Newtonian flow behavior at low shear rate. CoFe 2 O 4 ceramic films sintered at 1150 °C for 2 h have dense structure (relative density of 94%) and exhibited ferromagnetic properties with in-plane saturation magnetization of ∼324 emu/cm 3 .
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Nanoscience and Nanotechnology Letters
·
2015
·Vol. 7
·期 5
·441-445
·
IF 1.431
Chen Tingting,Lu Ziyang,Yang Lili,Ma Zhongfei,He Ming,Zhou Weichao,Li Jiqin,Zhao Xiaoxu,Zhu Zhi,Wang Dandan,Huo Pengwei,Yan Yongsheng
A novel imprinted ZnO/magnetic fly-ash photocatalyst (imprinted ZnO/MFA) was synthesized by the imprinting technique based on danofloxacin mesylate (DM) as the template molecule, zinc acetate as the reactive precursor, magnetic fly-ash (MFA) as the matrix material. The as-prepared imprinted
ZnO/MFA was extensively characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), elemental analysis, UV-vis diffused reflectance spectra (UV-vis) and vibrating sample magnetometer (VSM). The results indicated that imprinted ZnO/MFA possessed like-spherical structure, superior
magnetic property (M
s = 30.31 emu/g), the average diameter of imprinted ZnO/MFA was approximately 80 μm. Moreover, imprinted ZnO/MFA was proved to exhibit higher photocatalytic efficiency than other photocatalysts and the degradation rate of degradation of DM in
120 min under the ultraviolet light irradiation was 89.64%. In addition, compared with ZnO/magnetic fly-ash photocatalyst (ZnO/MFA), imprinted ZnO/MFA showed good selectivity for photodegradation of DM.
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危险品化学品经营许可证（带存储）