Nanomaterials
·
2021
·Vol. 11
·期 12
·3283
·
IF 5.076
Wenbin Yang,Siqi Niu,Yao Wang,Linjun Huang,Shichao Wang,Ketul C. Popat,Matt J. Kipper,Laurence A. Belfiore,Jianguo Tang
In this work, titania (TiO2) nanoparticles modified by Eu(TTA)3Phen complexes (ETP) were prepared by a simple solvothermal method developing a fluorescence Mn7+pollutant sensing system. The characterization results indicate that the ETP cause structural deformation and redshifts of the UV-visible light absorptions of host TiO2nanoparticles. The ETP also reduce the crystallinity and crystallite size of TiO2nanoparticles. Compared with TiO2nanoparticles modified with Eu3+(TiO2-Eu3+), TiO2nanoparticles modified with ETP (TiO2-ETP) exhibit significantly stronger photoluminescence under the excitation of 394 nm. Under UV excitation, TiO2-ETP nanoparticles showed blue and red emission corresponding to TiO2and Eu3+. In addition, as the concentration of ETP in TiO2nanoparticles increases, the PL intensity at 612 nm also increases. When ETP-modified TiO2nanoparticles are added to an aqueous solution containing Mn7+, the fluorescence intensity of both TiO2and ETP decreases. The evolution of the fluorescence intensity ratio (I1/I2) of TiO2and ETP is linearly related to the concentration of Mn7+. The sensitivity of fluorescence intensity to Mn7+concentration enables the design of dual fluorescence ratio solid particle sensors. The method proposed here is simple, accurate, efficient, and not affected by the environmental conditions.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
Coatings
·
2025
·Vol. 15
·期 8
·965
·
IF 2.8
Wei Zhang,Xuran Zhu,Baoan Li,Boyang Hu,Leyu Shen,Yanzong Meng,Haifeng Gao
Commercial hydrophobic membranes encounter severe problems such as membrane wetting and membrane fouling under extreme conditions, which affect membrane separation performance. To enhance the anti-fouling abilities of hydrophobic membranes, a composite membrane with omniphobic characteristics was fabricated successfully in this paper. Titanium dioxide (TiO2) nanoparticles were in-situ grown via the hydrothermal synthesis method, and then fluorosilane with low surface energy was grafted on polyvinylidene fluoride (PVDF) membranes. Subsequently, the morphologies, chemical compositions, wetting properties and structural parameters of composite membranes were characterized systematically. Various contaminants were added to the feed to investigate the anti-fouling and anti-wetting performances of the composite membrane in membrane distillation tests. The results showed that butyl titanate was first hydrolyzed to form titanium hydroxide (Ti(OH)4) and then it was dehydrated to form TiO2in the hydrothermal environment. TiO2crystals continued to grow and formed rough morphology with micro-nano synergistic distribution, which is similar to a “sunflower” disk composed of cubic clusters and nanopillars. Meanwhile, fluorosilane successfully was grafted onto TiO2. The contact angles of deionized water, 0.4 mM sodium dodecyl sulfate (SDS) solution and 0.2%v/vmineral oil emulsion on the composite membrane surface were 167.3°, 162.0° and 158.5°, respectively, endowing the composite membrane with excellent omniphobic features. In direct contact membrane distillation (DCMD) tests, the composite membrane exhibited a relatively stable membrane permeate flux, and the salt rejection rate almost reached 100%. The mixture, consisting of inorganic salts, organic substances, surfactants and oil emulsions, was used as feed. In contrast, the commercial PVDF membrane flux decreased drastically and even dropped to 0 due to the membrane fouling and wetting. As for the pristine PVDF membrane, the membrane surface was covered with pollutants and membrane pores were blocked. Therefore, it was proved that the omniphobic composite membrane possesses outstanding anti-fouling and anti-wetting performance.
研究领域:
膜科学
·
材料工程
·
表面化学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 7
·4445-4456
·
IF 1.354
Liu Min-Chao,Liu Bing,Sun Xiang-Yu,Lin Hui-Chao,Lu Jia-Zheng,Jin Shu-Fang,Yan Si-Qi,Li Yan-Yu,Zhao Ping
The dose-dependent toxicity and low specificity against cancerous cells have restricted the clinical use of daunomycin (DNM). Titanium dioxide (TiO2) has been wildly used as an inorganic photodynamic therapy (PDT) agent and drug carrier. To facilitate the targeted drug delivery
and combined therapy, in the present study, TiO2-coated Fe3O4 nanoparticles (Fe3O4@TiO2 NPs) were employed to load DNM and the drug-loaded Fe3O4@TiO2-DNM Nps exhibited smart pH-controlled releasing
and satisfactory cytotoxicity as well as photocytotocity. The combination of prussian blue staining and fluorescence methods evidenced the effortless cell internalization of the fabricated Fe3O4@TiO2-DNM Nps for the cancer cells. The cell cycle status experiments
indicated that the as-prepared nanospheres arrested the S and G2/M periods of the cancer cell proliferation in the dark, and further induced the apoptosis under the irradiation of ultraviolet light. The cell apoptotic results revealed that the apoptosis induced by the Fe3O4@TiO2-DNM
Nps was in the early stage. The constructed Fe3O4@TiO2-DNM NPs have been endowed with multifunctions that allow them to selectively deliver combinatorial therapeutic payload and exhibit integrated therapeutic effectiveness to tumors.
研究领域:
纳米医学
·
肿瘤学
·
药理学
✓ 已验证
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2013
·Vol. 14
·期 11
·1794-1802
·
IF 0.912
Li Hui,Fu Shiyu,Peng Lincai
Depositing of TiO 2 nanoparticles on cellulose fiber surface has potential technological applications in the field of photocatalysis. With this motivation, multilayers composed of lignosulfonates (LS) and TiO 2 nanoparticles were constructed on cellulose fiber surface via layer-by-layer (LBL) self-assembly technique. X-ray photoelectron spectroscopy (XPS), zeta potential measurement and atomic force microscopy (AFM) were used to characterize the LS/TiO 2 multilayers on cellulose fiber surface. Moreover, the photocatalytic activities of modified cellulose fibers (decomposition of methyl orange and antibacterial test) were investigated. The decomposition efficiency of methyl orange for a (LS/TiO 2 ) 5 multilayer modified cellulose fibers was 74.7 % under 5 h UV irradiation. Photocatalytic decomposition efficiency of methyl orange by LS/TiO 2 multilayer modified cellulose fibers under the same UV irradiation time increased linearly with the number of bilayers. Antibacterial tests results revealed that the cellulose fibers modified with LS/TiO 2 multilayers exhibited excellent antibacterial activity against E.coil . The degree of E.coil growth inhibition for a (LS/TiO 2 ) 5 multilayer modified cellulose fiber reached as high as 93 %. In addition, the effect of LS/TiO 2 multilayers on properties of handsheets made from modified cellulose fibers was also considered. The air permeability of the handsheet prepared from fibers modified with TiO 2 /LS multilayers had 6.1–24.3 % higher compared with that of handsheet prepared from original fibers. The wetting properties measurement results demonstrated that the water contact angle of handsheet oscillated with the increasing number of layers depended on building block which was in the outermost layer.
研究领域:
材料科学
·
环境科学
·
造纸工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Lijuan Zhang,Si Wang,Zhiqin Yuan,Chao Lu
Development of selective cataluminescence (CTL) sensors toward volatile organic compounds (VOCs) is of great importance to environmental analysis and daily chemicals safety. Although some reports for the determination of VOCs based on CTL have been reported, part of them suffered relatively low selectivity because of their high sensitivity toward interferents. In this study, mesoporous TiO 2 nanoparticles have been exploited to detect diethyl ether with the usage of a 440 nm bandpass filter. The proposed method showed high selectivity toward diethyl ether over other VOCs, such as acetaldehyde, acetone, butanone and butanol, etc. Such a high selectivity was majorly attributed to the difference of CTL emission profiles of various VOCs reaction intermediates, and only diethyl ether exhibited strong CTL emission at about 440 nm. Under the optimal conditions, diethyl ether could be detected ranging from 2.0 to 50.0 mM. Furthermore, the practical application of this proposed CTL sensor for diethyl ether was validated with artificial samples and commercial perfumes. In general, such a simple method with high selective detection through controlling detection range could be extended to other analytes.
研究领域:
环境分析
·
化学安全
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-7
·
IF 2.584
Chen Zeng,Wei Chaochao,Li Shengjun,Diao Chunli,Li Wei,Kong Wenping,Zhang Zhenlong,Zhang Weifeng
SnO 2 nanosheet-structured films were prepared on a fluorine-doped tin oxide (FTO) substrate using ZnO nanosheet as template. The as-prepared SnO 2 nanosheets contained plenty of nano-voids and were generally vertical to the substrate. TiO 2 nanoparticles were homogeneously deposited into the intervals between the SnO 2 nanosheets to prepare a hierarchically structured SnO 2 /TiO 2 hybrid film. The hybrid films were co-sensitized with CdS and CdSe quantum dots. The sensitized solar cells assembled with the SnO 2 /TiO 2 hybrid film showed much higher photoelectricity conversion efficiency than the cells assembled with pure TiO 2 films. The lifetime of photoinduced electron was also investigated through electrochemical impedance spectroscopy, which showed that the SnO 2 /TiO 2 hybrid film electrode is as long as the TiO 2 film electrode.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Ronghua Liu,Lina Jin,Dan Lu,Gang Hu,Long He,Jun Shan
In this paper, inspired by the cubic bi-continuous gyroid structure self-assembled by block copolymers, we start with the application of a novel and more facile approach, compared to the tedious synthetic procedures of block copolymers, to prepare the bi-continuous phases structured nanocomposite electrolytes. The bi-continuous phase structure is composed of a hard phase of the electrospun poly vinylidene fluoride (PVDF) non-woven scaffold providing the mechanical support for the electrolyte membranes and another soft phase built up then by the infiltration of polyethylene oxide (PEO) electrolyte into the PVDF scaffold membrane to be the ionic conducting phase. Therefore, the nanocomposite polymer electrolytes of the bi-continuous phase structure are prepared with addition of the different amounts of TiO 2 nanoparticles into the PEO electrolyte (containing LiClO 4 ). The nanocomposite electrolyte membranes have systematically been characterized by scanning electron microscopy (SEM), differential scanning calorimeter (DSC), X-ray diffraction (XRD), and tensile test. The tensile results indicate that the infiltration of PEO phase into the PVDF scaffold can greatly improve the elongation of the electrolyte membrane at break, but the tensile strength of the electrolyte membrane is substantially dependent on the electrospun PVDF scaffold. The ionic conductivity measurements show that addition of TiO 2 nanoparticles with an appropriate amount of ca . 10 wt% enhances the ionic conductivity of the nanocomposite electrolytes to 7.60 × 10 −5 S cm −1 at 60 °C, compared to 8.33 × 10 −6 S cm −1 at 60 °C of the PEO–LiClO 4 electrolyte. The effect of TiO 2 nanoparticles on the enhancement of Li + ion conductivity has been investigated by attenuated total reflectance-Fourier transform infrared spectra (ATR-FTIR), and the results show that a competitive interaction between TiO 2 nanoparticles and Li + ions weakens to some extent the existing complexing action of ether-O…Li + , allowing Li + ions faster transfer. However, we have found by high-resolution transmission electron microscopy (HRTEM) that the real dispersion state of TiO 2 nanoparticles in the nanocomposite electrolytes is in the form of large aggregates instead of the individual primary nanoparticles, which would tremendously depress the surface effect of the individual nanoparticles and greatly impact on the enhancement of the ionic conductivity.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Qiqian Gao,Xueyu Zhang,Lianfeng Duan,Xiaoju Li,Xuesong Li,Yue Yang,Qiang Yu,Wei Lü
Herein, a TiO 2 nanoparticle/nanorod composite architecture was suggested for improving performance of quantum dot sensitized solar cells (QDSSCs), which was fabricated on transparent conductive glass substrates (FTO) via hydrothermal method followed by spin-coating, and further used as photoanode of QDSSCs. Compared with the TiO 2 nanorod photoanode, the power conversion efficiency (PCE) of the QDSSCs with this architecture was obviously improved. The champion efficiency of 4.42% was achieved, showing a 33.5% enhancement in PCE. The improved PCE mainly resulted from the increase of J sc , which increased from 9.80 (nanorod architecture) to 15.48 mA/cm 2 (nanoparticle/nanorod composite architecture). The advantages of the composite structure photoanode consist in the superior light scattering capability, faster electron transport and increased photogenerated electron concentration.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Materials
·
2017
·Vol. 10
·期 5
·456
·
IF 2.654
Lihui Xuan,Guangping Han,Dong Wang,Wanli Cheng,Xun Gao,Feng Chen,Qingde Li
Surface modification and characterization of titanium dioxide (TiO2) nanoparticles and their roles in thermal, mechanical, and accelerated aging behavior of foamed wheat straw fiber/polypropylene (PP) composites are investigated. To improve the dispersion of nanoparticles and increase the possible interactions between wheat straw fiber and the PP matrix, the surface of the TiO2nanoparticles was modified with ethenyltrimethoxy silane (A171), a silane coupling agent. The grafting of A171 on the TiO2nanoparticles’ surface was characterized by Fourier transform infrared spectroscopy (FTIR). The wheat straw fibers treated with A171 and modified TiO2nanoparticles were characterized by FTIR and thermogravimetric analysis (TGA). FTIR spectra confirmed that the organic functional groups of A171 were successfully grafted onto the TiO2nanoparticles and wheat straw fibers, and the modified TiO2nanoparticles were adsorbed onto the wheat straw fibers. Thermogravimetric analysis showed that a higher thermal stability of the wheat straw fiber was obtained with the modified TiO2nanoparticles. The flexural, tensile, and impact properties were improved. A higher ultraviolet (UV) stability of the samples treated with modified TiO2nanoparticles was exhibited by the study of the color change and loss in mechanical properties.Keywords:surface-modified TiO2nanoparticles;foamed wheat straw fiber/polypropylene composites;mechanical properties;thermostability;UV stability
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Heng Shi,Yi He,Yang Pan,Haihui Di,Guangyong Zeng,Lei Zhang,Chunli Zhang
Binding nanoparticles on complex structured materials surface is an important issue for nanotechnology, such as obtain an superwetting surface. To fabricate a highly nanoparticles decorated polymer membrane with superior surface wettability , a facile and environmentally method stills remains challenge. Taken advantage from the mussel-inspired method, we reported here that the TiO 2 nanoparticles were directly anchored on the surface of poly(vinylidene fluoride) (PVDF) membrane, making the intrinsic hydrophobic polymer membrane become hydrophilic, what's more, the mussel inspired method was modified by introducing a silane coupling agent KH550, the ability to bind nanoparticles was retained and the as-prepared membrane turn from a common hydrophilic state to superhydrophilic state. Besides, the as-prepared superhydrophilic PVDF membrane could be applied on the separation of various kinds of surfactant stabilized oil-in-water emulsion with an ultrahigh efficiency nearly 99% and also shows durable oil resistance and antifouling performance, thus make the membrane easily to recycle. In addition, due to the universality of dopamine, this surface modification method should also be applicable on other organic–inorganic hybrid materials.
研究领域:
材料科学
·
纳米技术
·
环境工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Xiaojing Zhang,Yue Zhou,Tengfei Xu,Kaiwei Zheng,Rongrong Zhang,Zhaoxue Peng,Hongzhong Zhang
In this study, a sequencing batch reactor (SBR) was operated as Anammox and used as parent reactor. Then three SBRs seeded from the parent reactor were adopted for investigating the effect of CuO, ZnO and TiO 2 nanoparticles (NPs) on nitrogen removal, microbial activity and microbial communities of Anammox. The bioactivities of anaerobic ammonia-oxidizing bacteria (AAOB) after different exposure period were detected by batch experiments. Results showed that NPs performed immediate and durable toxicity on Anammox. The nitrogen removal efficiency decreased to 2.3%, 2.9% and 14.0% from 71%, the Anammox rate decreased to 0.13, 0.16 and 0.75 from 2.76 mg h −1 g −1 VSS, and the relative abundance of AAOB decreased to 2.57%, 2.78% and 2.61% from 7.99%, respectively. CuO and ZnO NPs performed similar effect, while CuO NPs led to the most severe toxicity and lowest accumulative effect. TiO 2 NPs showed the lowest toxicity but most durable suppression on Anammox process.
研究领域:
环境工程
·
微生物学
·
污水处理
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Jia Liu,Run-Tian Ma,Yan-Ping Shi
With the increasing demand for lipase inhibitors and new drugs used in the clinical treatment of obesity, it is of great significance to screen lipase inhibitors from traditional Chinese medicines (TCMs) via capillary electrophoresis. In this work, Fe 3 O 4 @TiO 2 nanoparticles was fabricated by solvothermal method and employed as an improved magnetic support to immobilize lipase through electrostatic interaction. By the method of transmission electron microscopy, fourier transform infrared spectroscopy and X-ray diffraction, the magnetic nanoparticles were characterized. The immobilized enzyme possessed advantages of a wider range for pH and temperature endurance, better storage stability and reusability. The kinetics performances of the immobilized lipase were studied. When p-Nitrophenyl palmitate (pNPP) was used as enzyme substrate, the Michaelis-Menten constant was calculated to be 2.51 mM and its inhibition constant for Orlistat was ascertained to be 13.41 μM. Ultimately, the established method was applied to lipase inhibitors screening from 6 Tibetan medicines with lipase inhibitory activity and Oxytropis falcate Bunge was screened out for its supreme lipase inhibitory activity. 11 compounds in the Oxytropis falcate Bunge were further screened, five compounds exhibited similar inhibitory activity to Orlistat, and one compound (kaempferol) presented better inhibitory activity than Orlistat, which is the most commonly used drugs to treat obesity in clinic. This work not only developed a method for new anti-obesity drugs discovery, but also provided inspiration for exploring new medicinal value of the TCMs.
研究领域:
药学
·
生物技术
·
中药学
·
药物发现
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）