MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Asim Mushtaq,Yike Hou,Cong Tian,Tianhao Deng,Changliang Xu,Zhichao Sun,Xiangdong Kong,M. Zubair Iqbal
Multifunctional magnetic photosynthesizer nanocomposites are highly desired to improve the efficacy of the early cancer diagnosis and therapy. However, design a highly biocompatible theranostic system with controlled size and shape at the nanoscale without altering the original properties of the primary materials is a challenging task. Herein, rhombic shaped manganese (Mn) doped titanium dioxide (TiO 2 ) nanocomposites are designed to enhance the generation of reactive oxygen species (ROS) by photocatalytic property and spin relaxation for MRI. Transmission electron microscopy (TEM) results revealed the average size of the synthesized Mn-TiO 2 rhombic nanocomposites (RNCs) was about 20–30 nm with homogeneous shape and dispersion. EDS and XPS analyses proved the incorporation of Mn ions into the anatase TiO 2 lattice. After Pluronic® F-68 surface modification, Mn-TiO 2 -PF-68 RNCs demonstrated negligible toxicity and physiological stability. Prepared fluorescein isothiocyanate (FITC) labeled RNCs are encapsulated by the plasma membrane and surrounded the nucleus of 4T1 mice breast cancer cells which improve the efficiency of prepared RNCs. In addition, the Mn 3+ ions remarkably enhanced the positive contrast (T 1 ) for magnetic resonance imaging (MRI) and presented significant r 1 relaxivity and low r 2 /r 1 relaxivity ratio. Finally, Mn 3+ doped with photosensitizers (TiO 2 ) also exhibited a great synergistic effect of photo-killing in vitro by developing hydroxyl radicals. Therefore, the as-prepared Mn–TiO 2 RNCs are promising candidate as a new kind of multifunctional agent for both MRI and PDT applications.
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高影响因子
Polymers
·
2020
·Vol. 12
·期 1
·85
·
IF 3.426
Qilong Zhang,Zhao Zhang,Nuoxin Xu,Hui Yang
Nanocomposites containing inorganic fillers embedded in polymer matrices have exhibited great potential applications in capacitors. Therefore, an effective method to improve the dielectric properties of polymer is to design novel fillers with a special microstructure. In this work, a combination of hydrothermal method and precipitation method was used to synthesize in situ SnO2nanoparticles on the surface of one-dimensional TiO2nanowires (TiO2NWs), and the TiO2NWs@SnO2fillers well-dispersed into the poly (vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) [P(VDF-TrFE-CTFE)] polymer. Hybrid structure TiO2NWs @SnO2introduce extra interfaces, which enhance the interfacial polarization and the dielectric constant. Typically, at 10 vol.% low filling volume fraction, the composite with TiO2NWs @SnO2shows a dielectric constant of 133.4 at 100 Hz, which is almost four times that of polymer. Besides, the TiO2NWs prevents the direct contact of SnO2with each other in the polymer matrix, so the composites still maintain good insulation performance. All the improved performance indicates these composites can be widely useful in electronic devices.Keywords:hybrid structure;composites;interfacial polarization;dielectric performances
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PubMed
高影响因子
Russian Journal of Physical Chemistry A
·
2020
·Vol. 94
·期 5
·1067-1072
·
IF 0.719
Liang An,Meng Yuan,Wang Tao,Xiong Chao,Yan Zhaoxiong,Xu Zhihua
Abstract A new magnetic Ag 3 PO 4 –TiO 2 –Fe 2 O 3 photocatalyst (Ag–Ti–Fe) has been synthesized by a solid-state blending method. The sample was analyzed by XRD, FT-IR, and VSM, and its photocatalytic performance in treatment of simulated dye-contaminated wastewater was evaluated in photocatalytic tests. SEM and FT-IR results confirmed that Ag–Ti–Fe catalyst was composed of Ag 3 PO 4 , anatase and maghemite. Results of photocatalytic tests revealed that Ag–Ti–Fe exhibited the highest photocatalytic activity on water treatment compared with contrastive samples whether the light source was UV or visible light, and the ultimate degradation efficiency of orange II reached 86.71 and 78.13%, respectively. Ag–Ti–Fe could decompose chemically stable groups, rather than simply destroy chromogenic azo double bonds, and it could further effectively remove methyl orange, rhodamine B, methylene blue from water, respectively. VSM results showed that the saturation magnetization of Ag–Ti–Fe was 4.80 emu/g, and it could be separated simply and quickly with the magnetic field.
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高影响因子
ChemElectroChem
·
2017
·Vol. 5
·期 3
·540-545
·
IF 4.136
Dongdong Wang,Guanghui Zhang,Zhongqiang Shan,Tianyong Zhang,Jianhua Tian
Graphical Quick recharge : Hierarchically structured TiO 2 /micron carbon fibers composites composed of well-defined nanowires are fabricated through a straightforward impregnation−calcination process. Owing to its unique features, the material delivers an excellent cycling stability with 92 % capacity retention after 5000 cycles at a high current density of 2000 mA g −1 , highlighting its great potential for ultralong, fast, rechargeable lithium-ion batteries. Long-life lithium-ion batteries require materials with well-designed and controlled structures on nanometer and micrometer scales. Therefore, the hierarchically structured TiO 2 /micron carbon fibers composites (TiO 2 /MCFs) composed of well-defined nanowires are fabricated through a straightforward impregnation-calcination process. The unique features, including hierarchically mesoporous micro-/nanostructures, large specific surface area, and high electrical conductivity endow the TiO 2 /MCFs with convenient lithium-ion and electron diffusion channels and effective stress−strain relief during repeated electrochemical reaction process. As anticipated, TiO 2 /MCFs deliver an excellent cycling stability with 92 % capacity retention after 5000 cycles at high current density of 2000 mA g −1 , highlighting the great potential for long-life and fast-charging lithium-ion batteries.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Chunli Wang,Nazhen Liu,Ning Wang,Zheng Ma,Yong Tian,Lifei Wang,Xuwei Chen,Baorong Hou
In this work, an initiator-free polymerization of 4,4′-diaminobiphenyl (DABP) happened on the TiO 2 nanotube arrays (TNT/Ti) via a facile in-situ solvothermal synthesis method. The poly-4,4′-diaminobiphenyl (PDABP) modified TNT/Ti (PDABP/TNT/Ti) composite was fully characterized by SEM, XRD, FTIR, and XPS. The prepared PDABP/TNT/Ti exhibited stronger visible light absorption, improved separation of photogenerated charge carriers, reduced charge transfer resistance at the interface, and enhanced reducing capability of photoelectrons (as indicated by the more negative energy level of the conduction band, E CB ). Attributed to the formation of the type II heterostructure between TiO 2 and PDABP, the PDABP/TNT/Ti showed enhanced photoelectrochemical (PEC) cathodic performance by polarizing the potential of 304 stainless steel (304SS) to ∼−900 mV in a 3.5 wt% NaCl. By replacing monomers, the strategy of enhancing the PEC cathodic protection performance of TNT/Ti using electrically conducting polymers of aromatic amines was confirmed to be simple and effective.
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高影响因子
RSC Advances
·
2014
·Vol. 4
·期 37
·19266-19272
·
IF 3.708
Zhimin Ren,Xinxin Fu,Chao Chen,Jia Wang,Chenyao Fan,Guodong Qian,Zhiyu Wang
Hierarchical TiO2 sub-microspheres (SMSs) constructed from anatase TiO2 nanorods (NRs) are prepared by a simple bottom-up self-assembly approach. The assembly process is achieved by dissolving the oleic acid-coated NRs into cyclohexane solution and refluxing at 80 °C without any other surfactants or complex steps. The TiO2–C nanocomposite is synthesized by carbonization and the amorphous carbon layer is formed in situ on the surface of the nanorods, which could improve the conductivity of the electrode. The hierarchical structures of TiO2–C SMSs are verified by BET test results, which shows a typical type-IV isotherm curve and the pore volume of the SMSs is approximately three times that of the NRs, indicating the formation of three-dimensional mesoporous networks. As a Li-ion battery anode material, the assembled TiO2–C SMSs exhibit better electrochemical performance with enhanced capacity, greater cyclic stability and better rate performance compared to those of unassembled NRs or P25. Moreover, any other oleic acid-coated nanocrystals could be prepared by adopting this bottom-up strategy.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2015
·Vol. 17
·期 11
·1-11
·
IF 2.184
He Guang’an,Chen Rui,Lu Shushen,Jiang Chengchun,Liu Hong,Wang Chuan
The predictable significant increase in manufacture and use of engineered nanoparticles (ENPs) will cause their inevitable release into environment, and the potential harmful effects of ENPs have been confirmed. As representative ENPs, sedimentation behavior of nano-titanium dioxide (n-TiO 2 ) should be better understood to control its environmental risk. In this study, an experimental methodology was established to set the sampling area and sampling time of n-TiO 2 sedimentation. In addition, we defined a quasi-stable state and a precise index, i.e., sedimentation efficiency (SE) at this state, to describe the n-TiO 2 sedimentation behavior. Both alternative concentration determination and conventional size measurement were applied to evaluate the sedimentation behavior of n-TiO 2 with fulvic acid. Results showed that the sedimentation behavior described by SE was more precise and in disagreement with those predicted by particle size. Moreover, sedimentation experiments with salicylic acid (SA), under an electric field and different water temperatures or with sulfosalicylic acid under light irradiation were also performed. When the total organic carbon concentration of SA, the voltage of working electrodes, and water temperature increased, or the wavelength of light source decreased, the SE of n-TiO 2 increased and n-TiO 2 showed a tendency to settle in water. These findings might be important for deepening the understanding of n-TiO 2 environmental behavior and exploring sedimentation behavior of other ENPs.
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高影响因子
International Journal of Nanomedicine
·
2023
·
IF 8
Yong Huang,Guiqin Song,Xiaotong Chang,Zhenhui Wang,Xuejiao Zhang,Shuguang Han,Zhuobin Su,Hejie Yang,Dongdong Yang,Xiaojun Zhang
Background Poor mechanical properties, undesirable fast dissolution rate, and lack of antibacterial activity limit the application of hydroxyapatite (HA) as an implant coating material. To overcome these limitations, a hybrid coating of Ag+-substituted fluorhydroxyapatite and titania nanotube (TNT) was prepared.Methods The incorporation of silver into the HA-TiO2 hybrid coating improves its antimicrobial properties. The addition of F as a second binary element increases the structural stability of the coating. The TNT/F-and-Ag-substituted HA (FAgHA) bilayer coating on the Ti substrate was confirmed by X-ray diffraction, scanning electron microscope, energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS).Results The results indicate that the FAgHA/TNT nanocomposite coating has a dense and uniform morphology with a nano-rod-like structure. The solubility measurement result shows that the substitution of F− ions into the AgHA structure has a positive effect on the dissolution resistance of HA. The adhesion strength of FAgHA/TNT has significantly increased because of the interlocking of the roughened surface with nano-rod-like particles that entered into the voids of the TiO2 nanotubes. Compared with that of the bare Ti, the corrosion current density of FAgHA/TNT-coated Ti substrate decreased from 3.71 to 0.18 μA, and its corrosion resistance increased by almost two orders of magnitude. Moreover, despite pure HA, the FAgHA killed all viable Staphylococcus aureus after 24 hours of incubation. Although the fabricated FAgHA/TNT coating is hydrophobic, it induced deposition of the typical spherical apatite when immersed in a simulated body fluid (SBF); the osteoblasts spread very well on the surface of the coating. In addition, in vitro cell culture tests demonstrated cell viability and alkaline phosphatase (ALP) similar to pure HA, which indicated good cytocompatibility. Interestingly, compared with bare Ti, FAgHA/TNT-coated Ti surface was innocent for cell vitality and even more beneficial for cell osteogenesis in vitro.Conclusion Enhancing the osseointegration and preventing infection in implants, the FAgHA/TNT-coated Ti makes implants more successful.
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PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2012
·
IF 1.867
Xiuyong Chen,Kaiyong Cai,Jiajia Fang,Min Lai,Jinghua Li,Yanhua Hou,Zhong Luo,Yan Hu,Liling Tang
To exploit titanium implants with long-term antibacterial property, TiO 2 nanotubes were firstly generated onto titanium substrates via an anodization method, silver nanoparticles were then formed in situ within the TiO 2 nanotubes and a quaternary ammonium salt (QAS, 3-trimethoxysily-propyldimethyloctadecyl-ammonium chloride) was immobilized onto TiO 2 nanotubes. The successful construction of the antibacterial TiO 2 nanotubes was revealed by field-emission scanning electron microscopy (FE-SEM) equipped with energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), thin-film X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and contact angle measurements, respectively. The antibacterial property of the prepared substrates was determined using zone of inhibition (ZoI) and antibacterial rates of Escherichia coli ( E. coli ). The cytotoxicity of the substrates was evaluated with osteoblasts in vitro. The Ag nanoparticle loaded and QAS coated TiO 2 nanotube substrates (TiO 2 nanotube-Ag-QAS) demonstrated long-term antibacterial effect. Moreover, TiO 2 nanotube-Ag-QAS substrates displayed good biocompatibility. The study presented a promising approach to fabricate antibacterial titanium-based implants for orthopedic application.
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Dongban Duan,Hui Liu,Yang Xu,Yuxiang Han,Mengxin Xu,Zhengchu Zhang,Zhibo Liu
The classical photodynamic therapy (PDT) requires external light to activate photosensitizers for cancer treatment. However, limited tissue penetration of light has been a long-standing challenge for PDT to cure malignant tumors in deep tissues. Recently, Cerenkov radiation (CR) emitted by radiotracers such as 18F-fluorodeoxyglucose (18F-FDG) has become an alternative and promising internal light source. Nevertheless, fluorine-18 (F-18) only releases 1.3 photons per decay in average; consequently, injection dose of F-18 goes beyond 10–30 times more than usual to acquire therapeutic efficacy because of its low Cerenkov productivity. Gallium-68 (Ga-68) is a favorable CR source owing to its ready availability from generator and 30-time higher Cerenkov productivity. Herein, we report, for the first time, the use of Ga-68 as a CR source to activate dextran-modified TiO2 nanoparticles (D-TiO2 NPs) for CR-induced PDT. Compared with 18F-FDG, 68Ga-labeled bovine serum albumin (68Ga-BSA) inhibited the growth of 4T1 cells and exhibited significantly stronger DNA damage to tumor cells. In vivo studies showed that the tumor growth was almost completely inhibited when tumor-bearing mice were treated with a combination of D-TiO2 NPs and 68Ga-BSA. This study proved that Ga-68 is a more potent radionuclide for PDT than F-18 both in vitro and in vivo offered a promising strategy of using a diagnostic dose of radioactivity to achieve depth-independent cancer therapy without using any external light source.
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PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Zhen He,Yu Zhou,Yuxin Wang,Pingyi Guo,Wensen Jiang,Caizhen Yao,Xin Shu
Several Ni-W-P-TiO 2 nanocomposite coatings were developed by the sol-enhanced electroplating method. The phase and elemental compositions of coatings were determined, and the surface and cross-section morphology were characterized. The mechanical and corrosion performance were systematically tested. The results revealed the addition of 5 ml·L −1 TiO 2 sol caused a compact coating surface, while higher concentrations of TiO 2 reduced the coating thickness and led to the inferior surface microstructure. The comparison in physiochemical properties of prepared coatings confirmed the superior performance of the Ni-W-P-TiO 2 nanocomposite coating at 5 ml·L −1 TiO 2 sol addition. Under this condition, the best mechanical properties were achieved when abrasive wear was the dominating wear-resistance mechanism, and the best corrosion resistance was obtained due to its smooth and compact surface microstructure.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 5
·516-524
·
IF 4.5
Liu Yili,Che Guoliang,Cui Weizhong,Pang Beili,Sun Qiong,Yu Liyan,Dong Lifeng
All-inorganic cesium lead bromide (CsPbBr 3 ) perovskite solar cells have been attracting growing interest due to superior performance stability and low cost. However, low light absorbance and large charge recombination at TiO 2 /CsPbBr 3 interface or within CsPbBr 3 film still prevent further performance improvement. Herein, we report devices with high power conversion efficiency (9.16%) by introducing graphene oxide quantum dots (GOQDs) between TiO 2 and perovskite layers. The recombination of interfacial radiation can be effectively restrained due to enhanced charge transfer capability. GOQDs with C-rich active sites can involve in crystallization and fill within the CsPbBr 3 perovskite film as functional semiconductor additives. This work provides a promising strategy to optimize the crystallization process and boost charge extraction at the surface/interface optoelectronic properties of perovskites for high efficient and low-cost solar cells.
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高影响因子
危险品化学品经营许可证（带存储）