Colloid and Interface Science Communications
·
2020
·
IF 2.831
Gaoqi Wang,Lei Chen,Ding Weng,Jiadao Wang
The purpose of the work is to evaluate the effect of extracellular polymeric substance (EPS) on the surface properties of Streptococcus mutans , and on the interaction between the bacteria and anti-adhesion nanostructured surfaces. Interactions between Streptococcus mutans with or without EPS and nanostructured surfaces were measured with atomic force microscope. Acid-base, Van der Waals, and electrostatic interactions were evaluated according to XDLVO theory. The absorption of glucan was evaluated by quartz crystal microbalance method. Results indicate Streptococcus mutans adhere stronger on surfaces with lower surface energy in both EPS and non-EPS conditions, because acid-base interaction is dominant. It indicates the superhydrophobic surface is lack of durability and reliability in the underwater anti-adhesion. Larger adhesion forces of Streptococcus mutans are shown in EPS than non-EPS conditions. That is due to more hydrogen bonds formed between glucan and substrate surfaces, and the EPS reducing surface energy and affecting acid-base interaction.
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高影响因子
Journal of Surface Investigation
·
2019
·Vol. 13
·期 6
·1192-1198
·
IF 0
Neshchimenko V. V.,Mikhailov M. M.
The reflectance spectra of ZnO, TiO 2 , and SiO 2 micro-, nano-, and hollow powders after their exposure to 100-keV protons are analyzed at wavelengths between 250 to 2500 nm. The hollow particles are up to 5 μm in size with a specific surface area of 32 to 57 m 2 /g. It is established that hollow particles have a greater radiation stability to proton exposure than microcrystal particles. The effect is due to the absence of radiation-induced defects in the volume of the spherical particles, low ionization losses, and a high ability to relax radiation-induced defects in the thin layer of the sphere.
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Journal of Materials Chemistry B
·
2016
·Vol. 4
·期 15
·2591-2597
·
IF 4.872
Yilin Li,Hong Dai,Qingrong Zhang,Shupei Zhang,Sihong Chen,Zhensheng Hong,Yanyu Lin
A versatile photoelectrochemical immunoassay protocol was designed for quantitative monitoring of tumor markers by utilizing the poly(dopamine)-sensitized titanium dioxide (TiO2) signal crystal with an ordered mesoporous carbon support. Poly(dopamine) was introduced to alter the optical properties of the TiO2 signal crystal, thereby improving the visible light absorption and photoelectrical responses. More importantly, a new enzyme-like biomimetic catalyst was exploited as the signal amplifier to catalyze the reaction of hydroquinone. The generated product was deposited on the electrode surface and served as an efficient sacrificial electron acceptor, which could receive the photo-generated electrons of the excited semiconductor to assist the cathode photocurrent enhancement. Herein, a competitive-type immunosensor was achieved through the biomimetic catalyst labeled prostate specific antigen competing with the target antigen of different concentrations to react with the specific antibody anchored on the poly(dopamine)-sensitized TiO2 signal crystal. Under optimal conditions, the photocurrent decreased with increasing target concentration in a dynamic working range from 1 × 10−6 ng mL−1 to 50 ng mL−1, which provided a new photoelectrochemical method for tumor markers analysis.
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高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 8
·2063
·
IF 5.076
Zihao Zhao,Xiang Zhao,Mu Zhang,Xudong Sun
Surface-enhanced Raman scattering (SERS) for semiconductor nanomaterial systems is limited due to weak Raman signal intensity and unclear charge-transfer (CT) processes for chemical enhancement. Here, rare-earth element neodymium-doped titanium dioxide (Nd-TiO2) nanoparticles (NPs) were synthesized by the sol–gel method. The characterizations show that the doping of Nd ions causes TiO2NPs to show an increase in the concentration of defects and change in the energy level structure. The CT process between Nd-TiO2NPs substrate and probe molecule 4-Mercaptopyridine (4-Mpy) was innovatively analyzed using the relative energy level location relationship of the Dorenbos model. The SERS signal intensity exhibits an exponential enhancement with increasing Nd doping concentration and reaches its optimum at 2%, which is attributed to two factors: (1) The increase in the defect concentration is beneficial to the CT process between the TiO2and the probe molecule; (2) the introduction of 4felectron orbital energy levels of rare-earth ions created unique CT process between Nd3+and 4-Mpy. Moreover, the Nd-TiO2NPs substrate shows excellent SERS performance in Raman signal reproducibility (RSD = 5.31%), the limit of detection (LOD = 10−6M), and enhancement factor (EF = 3.79 × 104). Our work not only improves the SERS performance of semiconductor substrates but also provides a novel approach to the development of selective detection of probe molecules.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Qingqing Lang,Yaohan Chen,Tianlong Huang,Lining Yang,Shuxian Zhong,Lanju Wu,Jianrong Chen,Song Bai
The integration of plasmonic metal with wide-bandgap semiconductor is a promising approach to utilize the visible light without compromise of the redox ability of photogenerated charge carriers. However, a larger work function of metal than that of semiconductor is indispensable to enable the injection of hot electrons from plasmonic metal to semiconductor. In this paper, we demonstrated that reduced graphene oxide (rGO) nanosheets as conductive “bridge” can breakthrough the restriction and transfer hot electrons from Ag of smaller work function to TiO 2 of larger work function. In the design, both of the Ag nanocubes and TiO 2 nanosheets are co-deposited on the surface of rGO nanosheets to form Ag-rGO-TiO 2 structure, which was characterized by XRD, TEM, Raman and XPS spectra. On one hand, the Ag-rGO interface facilitates the transfer of hot electrons from Ag to rGO through conductor–conductor contact. On the other hand, the new formed Schottky junction on the rGO-TiO 2 interface further pumps the transferred electrons to the surface of TiO 2 for photocatalytic reduction reaction resulted from the larger work function of rGO than that of TiO 2 . Enabled by this unique design, the hydrogen production activity achieved under visible light irradiation is dramatically enhanced in comparison with that of Ag-TiO 2 counterpart with the direct contact between the same Ag nanocubes and TiO 2 nanosheets. This work represents a step toward the rational interfacial design of plasmonic metal-semiconductor hybrid structures for broad-spectrum photocatalysis.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 9
·1-11
·
IF 2.101
Feng Lu,Jiang Heng,Zou Mingming,Xiong Fengqiang,Ganeshraja Ayyakannu Sundaram,Pervaiz Erum,Liu Yinan,Zou Shunying,Yang Minghui
Abstract Manganese- and nitrogen-co-doped mesoporous TiO 2 microsphere photocatalysts are prepared by a simple sol–gel method with controllable sizes in the range of 400–500 nm and high surface area of 112 m 2 g −1 . Manganous acetate is the Mn source, and ammonia gas is the nitrogen source used. The dopants are found to be uniformly distributed in the TiO 2 matrix. Interestingly, in (Mn,N)-co-doped TiO 2 , we observe an effective indirect band gap of ~2.58 eV. (Mn,N)-co-doped mesoporous TiO 2 microspheres show higher photocatalytic activity than Mn–TiO 2 microspheres under visible light irradiation. Among the samples reported in this work, 0.2 at.% Mn doping and 500 °C 2-h nitriding condition give the highest photocatalytic activity. The observed photocatalytic activity in the (Mn,N)-co-doped TiO 2 is attributed to the contribution from improved absorption due to trap levels of Mn, oxygen vacancies and N doping. Graphical Abstract Manganese- and nitrogen-co-doped mesoporous TiO 2 microspheres containing substitutional N, interstitial N and O vacancies show high visible light photocatalytic activity.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Lei Cui,Siliang Liu,Fangke Wang,Jingyao Li,Yanhua Song,Ye Sheng,Haifeng Zou
In this work, uniform g-C 3 N 4 shells have grown on the surface of electrospinning TiO 2 nanofibers to form one dimensional core/shell structured TiO 2 /g-C 3 N 4 nanofibers by a facial melamine-involved vapor deposition approach. During the heat treatment process in a simple setup, the TiO 2 nanofibers served as supports to prevent the collapses and aggregations of g-C 3 N 4 while forming heterojunctions with g-C 3 N 4 at the interface. The as prepared heterogeneous TiO 2 /g-C 3 N 4 photocatalyst exhibited remarkably enhanced visible light photocatalytic activity for RhB degradation by maxing heterojunctions at the core/shell interface. The photodegradation reaction rate constant of the obtained heterojunction is 0.064 min −1 , which is 4.0 times that of pure g-C 3 N 4 (0.016 min −1 ). To reach higher RhB degradation efficiency (>90%), TiO 2 /g-C 3 N 4 shortened the irradiation time by 60 min compared with individual components (pure g-C 3 N 4 or TiO 2 nanofibers). The remarkably high photocatalytic performances are mainly ascribed to the synergetic effect of efficient photogenerated charge separation properties and decreased electron transfer resistance of the heterojunctions formed between g-C 3 N 4 and TiO 2 . We believe the proposed simple method and setup is an attractive strategy for constructing one dimensional g–C 3 N 4 –based nano-heterojunctions with excellent photocatalytic properties.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 11
·6953-6964
·
IF 4.186
Yuchao Qiu,Junjie Shi,Bin Yu,Changle Hou,Jingjing Dong,Song Li,Yumo Zhai,Jianzhong Li,Changsheng Liu
The recycling of titanium from titania-bearing slag is an important part of the circular economy; however, the yield of titania is restricted due to the lack of fundamental thermodynamic data. In the present work, the equilibrium phase relations of MgO–Al 2 O 3 –TiO 2 system in air at 1600°C have been determined using a high-temperature equilibration-quenching technique followed by X-ray photoelectron spectroscopy, scanning electron microscopy-energy-dispersive X-ray spectrometry, and X-ray diffraction. Ti 4+ was confirmed as the stable valence of titanium, and the rutile and spinel solid solution phases were detected to be coexisting with pseudobrookite solid solution phase, respectively. The formation principles of pseudobrookite and spinel solid solutions were confirmed in view of the corresponding crystal structure and the composition substitution relationship of the oxides at 1600°C. However, great discrepancies were found from the comparison of the present experimental results with the thermodynamic calculations and the literature results, and the present equilibrium phase relations are therefore significant for updating the present titania related thermodynamic database for a superior prediction of the thermodynamic behaviors of relevant process.
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高影响因子
TALANTA
·
2021
·
IF 6.057
Azhar Irfan,Wenxia Feng,Kexin Liu,Khan Habib,Qishu Qu,Li Yang
As an important post-translational modification of proteins, phosphorylation plays a key role in regulating a variety of complicated biological reactions. Owing to the fact that phosphopeptides are low abundant and the ionization efficiency could be suppressed in mass spectroscopic detection, highly efficient and selective enrichment methods are essential to identify protein phosphorylation by mass spectrometry. Here, we develop novel titanium oxide coated core shell mesoporous silica (CSMS@TiO 2 ) nanocomposites for enrichment of phosphopeptides with simultaneous exclusion of massive proteins. The CSMS@TiO 2 nanocomposites have essential features, including uniform 1.0 μm diameter, 120 nm thick shell, 7.0 nm mesopores perpendicular to the surface, large surface area of 77 m 2 /g and pore volume of 0.15 cm 3 /g, therefore can greatly improve the sensitivity for identifying phosphopeptides by capillary electrophoresis-mass spectrometry. The proposed CSMS@TiO 2 nanocomposites are applied for analysis of β-casein tryptic digest and bovine serum albumin (BSA) protein mixture, respectively. The results show that the number of phosphopeptides detected is tremendously increased by using CSMS@TiO 2 nanocomposite, proving selectively enriching phosphopeptides due to the size-exclusive and specific interaction of the TiO 2 -modified mesopores. The enrichment of the phosphopeptides is achieved even for the digests at very low concentration of β-casein (1 fmol/μL). This research would open up a promising idea to utilize mesoporous materials in peptidomics analysis.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 2
·701-712
·
IF 3.442
Yang Wangyang,Shen Honglie,Min Huihua,Ge Jiawei
In recent years, Ti 3+ self-doped TiO 2 (B-TiO 2 ) exhibits great potential as a photocatalyst. In this work, Ti vapor-assisted annealing is first demonstrated for Ti 3+ doping and improving the visible absorption of TiO 2 . TEM results exhibit the formation of disordered layer, indicating the successful fabricating of B-TiO 2 . The absorption increase in TiO 2 caused by Ti vapor annealing reaches nearly 50% in the visible wavelength range. Benefiting from the absorption increase, the photocatalytic performance of TiO 2 after Ti vapor annealing increases by 60–70%. Surface modification of Ag onto B-TiO 2 is also carried out to further improve its optical property. Ag-modified Ti 3+ self-doped TiO 2 (B-TiO 2 @Ag) exhibits great visible photodegradation behavior to RhB. The RhB degradation rate reaches 97.76% after 60 min of visible light irradiation. Electrochemical performance tests demonstrate that as-prepared TiO 2 @Ag has lower resistance than W-TiO 2 . The results indicate that B-TiO 2 @Ag has great potential in solar photocatalytic degradation of pollutant.
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高影响因子
Nanoscale
·
2018
·Vol. 10
·期 22
·10505-10513
·
IF 7.233
Xu Chen,Dongyu Li,Gencai Pan,Donglei Zhou,Wen Xu,Jinyang Zhu,He Wang,Cong Chen,Hongwei Song
CsPbX3 (X = Cl, Br or I) perovskite quantum dots (PQDs) have attracted tremendous attention due to their extraordinarily excellent optical properties. However, there is still an obstacle for their bio-application, which is limited by their water-instability. In this work, we have designed a novel visible light triggered photoelectrochemical (PEC) sensor for dopamine (DA) based on CsPbBr1.5I1.5 PQD immobilized three-dimensional (3D) TiO2 inverse opal photonic crystals (IOPCs). Supported by the TiO2 IOPCs, the water-stability of the PQDs as well as that of the PEC sensor was considerably improved. Furthermore, employed as a photoactive material in PEC sensor, CsPbBr1.5I1.5 PQDs can expand the photocurrent response of the PEC sensor to the whole visible region. In addition, the modulation of the photonic stop band effect of TiO2 IOPCs on the incident light and the emission of PQDs could further enhance the photocurrent response. Such a PEC sensor demonstrates sensitive detection of DA in phosphate buffer saline solution and serum, with a good linear range from 0.1 μM to 250 μM and a low detection limit of approximately 0.012 μM. Our strategy opens an alternative horizon for PQD based PEC sensing, which could be more sensitive, convenient and inexpensive for clinical and biological analysis.
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高影响因子
Advanced Materials Interfaces
·
2019
·Vol. 6
·期 10
·1801800
·
IF 4.713
Xin Cai,Wen Liu,Siyuan Yang,Shengsen Zhang,Qiongzhi Gao,Xiaoyuan Yu,Jun Li,Hongqiang Wang,Yueping Fang
Silicon-based materials (Si, SiO x , etc.) have intrigued numerous attentions to replace the graphite anode materials for high performance new-generation lithium-ion batteries. Herein, dual-confined SiO composites are developed as novel anode material for efficient lithium-ion batteries. The SiO-based anodes are prepared from commercial SiO microparticles via simple electrospinning, in which TiO 2 coated SiO particles are well embedded in the 3D interconnected carbon nanofiber web. Owing to the protective TiO 2 shell with extra capacitive activity, along with the conductive carbon nanofiber network affording sufficient void space to accommodate the volume expansion of SiO upon cycling, the dual-confined SiO anode can maintain its structural integrity and exhibit high reversible activity. It realizes acceptable initial Columbic efficiency and a stable discharge capacity of 760 mAh g −1 at 200 mA g −1 after 200 cycles, with an average capacity drop of 0.11% per cycle for continuous cycling. Besides, the ternary SiO@TiO 2 /carbon nanofiber composite allows for facilitated charge transport and electrolyte penetration in virtue of its 3D porous web structure, which contributes to a high-rate capacity of 338 mAh g −1 at 3 A g −1 . These inexpensive and stable SiO/carbon nanofiber composites can be potential alternative toward cost-efficient lithium-ion battery anode.
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高影响因子
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