COLLOIDS AND SURFACES B-BIOINTERFACES
·
2024
·
IF 5.4
Ziwei Kan,Ye Chen,Qianyun Zhang,Luyi Pan,Aiying Chen,Ding Wang,Yi Wang,Guangming Wan,Bin He
The catheters coating can be effective in reducing bloodstream infection and thrombosis, which are the major complications in blood contact catheters. However, the surface functional coating is difficult to be implemented due to the high surface stretching force from the minor-caliber. In this work, we propose a covalent bonding coating of polydopamine/titanium dioxide quantum dots (PDA/TiO 2 QDs) on polyurethane (PU) catheters, which can fulfill a dual-function of antibacterial and antithrombosis. The PDA/TiO 2 QDs layer was prepared by dip-coating, where the intermediate transition layer of PDA was reacted with the internal hydroxyls of PU surface by pre-oxidation and bonds with the external TiO 2 QDs coating. The surface microstructures are analyzed by SEM, TEM and XPS methods, and the antimicrobial and anticoagulant performances are investigated by bacterial plate count and platelet adhesion tests. The oxidizing and hydrophilic effect of the top layer of TiO 2 QDs were enhanced by the QD-sized particles. The antibacterial activities of the PDA/TiO 2 QDs coating on PU catheters against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ), especially to S. aureus , are evidenced by bacterial plate count test, reaching good bactericidal rates of 49.9 % against E. coli and 83.7 % against S. aureus , respectively. Platelet adhesion test and whole blood dynamic circulation modeling demonstrate that the PDA/TiO 2 QDs coating effectively inhibits platelet adhesion due to an excellent hydrophilicity of TiO 2 QDs surface, and thereafter reduce thrombus formation.
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高影响因子
Catalysts
·
2024
·Vol. 14
·期 10
·735
·
IF 3.8
Lu Qiu,Hanliang Li,Wenyi Xu,Rongshu Zhu,Feng Ouyang
The organic pollutants discharged from industrial wastewater have caused serious harm to human health. The efficient photocatalytic degradation of organic pollutants under sunlight shows promise for industrial applications and energy utilization. In this study, a modified TiO2photocatalyst doped with bismuth (Bi) and fluorine (F) and composited with SnO2and SiO2was prepared, and its performance for the degradation of Rhodamine B (RhB) under simulated sunlight was evaluated. Through the optimization of the doping levels of Bi and F, as well as the ratio of SnO2and SiO2to TiO2, the optimal catalyst reached degradation efficiency of 100% for RhB within 20 min under simulated sunlight, with a first-order reaction rate constant of 0.291 min−1. This value was 15, 41, 6.5, and 3.3 times higher than those of TiO2/SnO2, Bi/TiO2, Bi-TiO2/SnO2, and F/Bi-TiO2/SnO2, respectively. The active species detection showed that h+was the most crucial active species in the process. The role of Bi and F addition and SnO2-SiO2compositing was investigated by characterization. Bi formed a chemical bonding with TiO2by doping into TiO2. The absorbance intensity in the UV and visible light regions was improved by SnO2and F modification. Composite with SiO2led to a larger surface area that allowed for more RhB adsorption sites. These beneficial modifications greatly enhanced the photocatalytic activity of the catalyst.
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高影响因子
Nanoscale
·
2024
·Vol. 16
·期 45
·21031-21038
·
IF 5.8
Hanwen Hu,Yiyan Liao,Shanshan Tan,Chen Li,Jun Tang,Kun Zheng,Lei Yang
Ag2Se has emerged as a promising n-type thermoelectric material; however, its application is limited mainly due to the strongly coupled charge carrier and phonon transport. Enhancing phonon scattering by constructing interfacial complexes often results in low carrier mobility due to its strong carrier scattering resulting from the high energy barrier at the multiphase interface. Inspired by the cell membrane with selective permeability, we construct bio-mimic grain boundaries with TiO2 and MoS2 co-decoration in Ag2Se to decouple electron scattering from strong phonon scattering. The nanostructured TiO2 with a high dielectric constant screens the interfacial Coulomb potential, ensuring efficient carrier transport and reducing the grain boundary barriers, while the few-layer MoS2 provides significant phonon scattering to further reduce the thermal conductivity. This method effectively enhances the zT value of Ag2Se by as much as 60% and also can significantly enhance the theoretical output performance of the thermoelectric device, which highlights the effectiveness of the bio-mimic grain boundary engineering strategy.
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高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-12
·
IF 3.8
Yin Jinpeng,Wang Guanqin,Kong Dongqing,Li Chuang,Zhang Qiang,Xie Dongbai,Yan Yangyang,Li Ning,Li Qiang
To enhance the volumetric energy density and initial coulombic efficiency (ICE) of titanium oxide (TiO 2 ) as anode electrode material for lithium-ion batteries (LIB), this study employed a surface-confined in-situ inter-growth mechanism to prepare a TiO 2 embedded carbon microsphere composite. The results revealed that the composite exhibited a highly integrated structure of TiO 2 with oxygen vacancies and carbon, along with an exceptionally small specific surface area of 11.52 m 2 /g. Due to its unique microstructure, the composite demonstrated remarkable lithium storage properties, including a high ICE of 75%, a notable capacity of 426.8 mAh/g after 200 cycles at 0.2 A/g, superior rate performance of 210.1 mAh/g at 5 A/g, and an outstanding cycle life, with a capacity decay rate of only 0.003% per cycle over 2000 cycles. Furthermore, electrochemical kinetic studies further validated the advantages of this microstructure.
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高影响因子
RUBBER CHEMISTRY AND TECHNOLOGY
·
2024
·
IF 1.2
Li Y.,Yuan Y. Z.,Zhang Y.,Sun J. Y.,Tian X. H.,Jin J.,Wu W. B.
Antioxidants are usually added into NR to resist the oxidation caused by UV irradiation, whereas commonly used antioxidants are usually organic and prone to decomposition and migration. Inorganic UV absorbers such as titanium dioxide (TiO 2 ) and silicon dioxide (SiO 2 ) nanoparticles can maintain chemical stability under UV radiation, whereas the hydroxyl radicals from electron-hole pairs in TiO 2 would damage the NR matrix and the poor compatibility of TiO 2 with NR limited the process. Therefore, inert SiO 2 is coated on TiO 2 (TiO 2 @SiO 2 ) to reduce its photocatalytic activity, and polydopamine (PDA) is coated on rubber to improve stability. The strong light-absorbing properties of PDA could also improve the UV-resistant ability of NR. In addition, poly(sodium-p-styrenesulfonate) coating NR-PDA provides the matrix negative charge, and polydiallyl dimethyl ammonium chloride wrapped around TiO 2 @SiO 2 can give a positive charge, thereby moderating the compatibility between the filler and the matrix through electrostatic adsorption. The green UV-resistant natural composite NR-PDA-TiO 2 @SiO 2 was fabricated. The composites exhibited strong tensile strength and excellent UV-resistant properties, which particularly extend the service life of rubber products as UV-shielding materials, thus showing significant potential in extreme environments.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2016
·Vol. 21
·期 3
·715-724
·
IF 2.327
Zhang Kaiyue,Chen Si,Feng Yaqing,Shan Zhongqiang,Meng Shuxian
A novel polymer gel electrolyte was used to improve the performance and long-term stability in dye-sensitized solar cells (DSSCs). The polymer gel electrolyte (PGE) was prepared by mixing 5 wt% poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and 2 % TiO 2 nanoparticles. The conductivity of PGE with P25 reached 9.98 × 10 −3 S/cm, which increased by 34.9 % compared with 7.40 × 10 −3 S/cm of PGE without P25, and the diffusion coefficient was also increased by 19.0 %. Different photoelectrodes were obtained by using three kinds of surfactants (cetylamine, octadecylamine, and P123) as pore-forming materials, and their morphologies were contrasted through scanning electron microscopy (SEM). The results showed that gel electrolyte can increase the short-circuit current density ( J
sc ) from 11.01 to 12.99 mA/cm 2 in DSSCs. Moreover, unlike the liquid electrolyte, the gel electrolyte is more conducive to the TiO 2 photoelectrodes with larger pores. In conclusion, the efficiency of DSSC with gel electrolyte and P123 as pore-forming material was 6.73 %, which was 12 % higher than the liquid electrolyte in the same test condition. In addition, the sealed gel electrolyte DSSCs showed better stability than did liquid electrolyte DSSCs during nearly 600 h.
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高影响因子
Road Materials and Pavement Design
·
2019
·
IF 1.98
Xuejuan Cao,Mei Deng,Boming Tang,Yongjie Ding,Xiaoyu Yang
Nitric oxide (NO) emitted from vehicle exhausts are associated with adverse health effects on the public. This study prepared a graphitic carbon nitride (g-C3N4)/TiO2 composite using melamine and titanium dioxide (TiO2) and then applied the composite on chip seal for the photocatalytic removal of NO. The g-C3N4/TiO2 composite was synthesised by an ultrasonic-assisted solid-phase synthetic method. The results of X-ray powder diffraction, Fourier-transform infrared spectroscopy, and a scanning electron microscope indicated that g-C3N4 and TiO2 were successfully synthesised and most of the sheet structures of g-C3N4 were attached by approximately spherical TiO2 particles. The UV–Vis and PL characterisation suggested that optical absorption range of TiO2 was broadened and the separation of electronic-holes was hindered, which contributed significantly to the enhancement of the visible-light photocatalytic activity. The loading capacity of 0.0092 kg/m2 g-C3N4/TiO2 composite on chip seal specimens had the highest NO removal efficiency of 31.41% within 30 min.
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高影响因子
TEXTILE RESEARCH JOURNAL
·
2025
·
IF 1.9
Ruobing Yao,Yuting Xue,Cheng Zhang,Guangxian Zhang,Fang Xu,Yunxuan Weng
In order to protect the environment, it is very important to develop facile and repeatable methods to degrade organic pollutants in water. The reduced graphene oxide and (RGO) and titanium dioxide (TiO2)-functionalized polyethylene terephthalate (PET) fabrics (RGO-TiO2-PET) were facilely prepared using a one-step hydrothermal method. The RGO-TiO2-PET exhibited remarkable photodegradation efficiency and excellent recyclability. From the results, RGO enhanced the catalytic degradation of rhodamine B by RGO-TiO2-PET under visible light irradiation. The degradation of RhB catalyzed by TiO2-PET was 63.57% after 180 min of degradation under visible light irradiation, while it increased to 93.28% catalyzed by 5% RGO-TiO2-PET. Moreover, RGO-TiO2-functionalized PET fabric exhibited wonderful reusability, since its photocatalytic activity did not significantly decrease after five photocatalysis cycles. The significant enhancement of photocatalytic activity can be ascribed to the enhanced absorption of dyes and light, and charge transfer from the conduction band of TiO2 to the empty electronic states of RGO.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Huapeng Li,Bin Sun,Tingting Gao,Huan Li,Yongqiang Ren,Guowei Zhou
ABSTRACT Photocatalytic degradation and hydrogen production using solar energy through semiconductor photocatalysts are deemed to be a powerful approach for solving environmental and energy crisis. However, the biggest challenge in photocatalysis is the efficient separation of photo-induced carriers. To this end, we report that the mesoporous TiO 2 nanoparticles are anchored on highly conductive Ti 3 C 2 MXene co-catalyst by electrostatic self-assembly strategy. The constructed mesoporous TiO 2 /Ti 3 C 2 composites display that the mesoporous TiO 2 nanoparticles are uniformly distributed on the surface of layer structured Ti 3 C 2 nanosheets . More importantly, the as-obtained mesoporous TiO 2 /Ti 3 C 2 composites reveal the significantly enhanced light absorption performance, photo-induced carriers separation and transfer ability, thus boosting the photocatalytic activity . The photocatalytic methyl orange degradation efficiency of mesoporous TiO 2 /Ti 3 C 2 composite with an optimized Ti 3 C 2 content (3 wt%) can reach 99.6% within 40 min. The capture experiments of active species confirm that the •O 2 − and •OH play major role in photocatalytic degradation process. Furthermore, the optimized mesoporous TiO 2 /Ti 3 C 2 composite also shows an excellent photocatalytic H 2 production rate of 218.85 μmol g –1 h –1 , resulting in a 5.6 times activity as compared with the pristine mesoporous TiO 2 nanoparticles . This study demonstrates that the MXene family materials can be applied as highly efficient noble-metal-free co-catalysts in the field of photocatalysis .
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 24
·22844-22855
·
IF 2.22
Zhou Xiaojun,Ni Jian,Guan Jiayi,Liu Yue,Yin Junyang,Wang Jinlin,Zhang Yaofang,Li Juan,Cai Hongkun,Zhang Jianjun
Mesoporous TiO 2 (m-TiO 2 ) layer has been widely used as a photoelectrode of solar cells. Compared with conventional planar TiO 2 layer, appropriate pore size dramatically improves infiltration of perovskite (PVK) into the mesoporous layer because of the larger voids formed within the TiO 2 mesoporous layer and further enhances the light absorption efficiency of PVK for the better light-scattering ability of 20 nm TiO 2 nanoparticles. In our study, 75–95 nm pore size of TiO 2 scaffold layer was successfully prepared by adding different contents of ethyl cellulose (EC) as a template and terpineol as a leveling agent into conventional TiO 2 paste composed of 20 nm-sized TiO 2 nanoparticles and then applied to PVK solar cells (PSCs).The novel mesoporous layer was conducive to increase light-harvesting capacity and photovoltaic performance of PSCs. The influence of different contents of EC was discussed systematically for TiO 2 scaffold layer, the charge carrier dynamic, and the hysteresis behavior for our devices. Finally, by optimizing the parameters of the electron transport layer, the power conversion efficiency of the champion device with a 16.5% mass fraction of EC reached as high as 18%.
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高影响因子
PHYSICA SCRIPTA
·
2024
·Vol. 99
·期 10
·105572
·
IF 2.6
Gang Wang,Xinmiao Zhang,Xu Jiang,Jiang Li,Hongye Li,Jianqiao Song,Mengjing Jin,Jinyuan Zhou,Erqing Xie,Xiaojun Pan
The noble metal nanoparticles can improve the efficiency of photoelectric conversion via enhancement of light harvesting for the localized surface plasmon resonance (LSPR) effect. Here, TiO2 nanowires were constructed on carbon fiber cloth as a flexible photoanode for photoelectrochemical (PEC) ultraviolet (UV) photodetector. By decorated noble metal Ag nanoparticles on TiO2 nanowires, the photocurrent was improved from 35.9 μA cm−2 to 268.4 μA cm−2, and the rise and decay time were increased by 0.14 s and 0.12 s, respectively. Moreover, the recombination of photon-generated electrons and holes was also decreased in photoanode due to the Schottky barrier between Ag and TiO2. This work provided an approach to promote the performances of the PEC UV photodetector.
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高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2016
·Vol. 92
·期 4
·515-522
·
IF 2.008
Yanmei Luo,Yiru Jia,Dexian Zhang,Xinjian Cheng
TiO 2 /PVA composite nanofiber mat was prepared via an electrospinning technology. SH-TiO 2 -SiO 2 hybrid particles and PVA solution were injected through a coaxial syringe, yielding a composite nanofiber mat. The as-prepared SH-TiO 2 -SiO 2 /PVA composite nanofiber mat was immersed in Cd 2+ cation solution and S 2− anion solution in turn. Thus, yellow TiO 2 @CdS/PVA composite nanofiber mats were prepared. By adjusting the number of times a mat was immersed in the Cd 2+ and S 2− solutions, different amounts of CdS particles attaching to the mats were obtained. Both SH-TiO 2 -SiO 2 /PVA and TiO 2 @CdS/PVA composite nanofiber mats were employed to catalyze the photodegradation of a model dye, methylene blue. The photodegradation performance could be greatly enhanced by the introduction of CdS particles anchoring onto TiO 2 particles. The photodegradation efficiency reached 99.2% within 180 min. Also, the nanofiber mat could be recycled and reused at least 10 times. The photodegradation efficiency of TiO 2 @CdS/PVA composite nanofiber mats remained 68.8% for 10 cycles.
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高影响因子
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