ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Zhiguo Cheng,Kui Cheng,Wenjian Weng
Light-induced cell detachment shows much potential in in vitro cell culture and calls for high-performance light-responsive films. In this study, a smooth and dense SiO2/TiO2 nanocomposite thin film with thickness of around 250 nm was first fabricated on H2O2 treated polystyrene (PS) substrate via a low-temperature sol–gel method. It was observed that the film could well-adhere on the PS surface and the bonding strength became increasingly high with the increase of SiO2 content. The peeling strength and shear strength reached 3.05 and 30.02 MPa, respectively. It was observed the surface of the film could transform into superhydrophilic upon 20 min illumination of ultraviolet with a wavelength of 365 nm (UV365). In cell culture, cells, i.e., NIH3T3 and MC3T3-E1 cells, cultured on SiO2/TiO2 nanocomposite film were easily detached after 10 min of UV365 illumination; the detachment rates reached 90.8% and 88.6%, respectively. Correspondingly, continuous cell sheets with good viability were also easily obtained through the same way. The present work shows that SiO2/TiO2 nanocomposite thin film could be easily prepared on polymeric surface at low temperature. The corresponding film exhibits excellent biocompatibility, high bonding strength, and good light responses. It could be a good candidate for the surface of cell culture utensils with light-induced cell detachment property.
研究领域:
材料科学
·
生物医学工程
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Hongwei Feng,Hui Xu,Hongtu Feng,Ying Gao,Xinyuan Jin
The sol-gel method was used to synthesize Gd-SiO 2 -TiO 2 composite photocatalysts. When the doping amounts of Si and Gd reached 9.1 mol% and 0.2 mol% respectively, the sample showed the optimal photocatalytic activity during the methylene blue (MB) degradation. When the calcination temperature was lower than 550 °C, Gd-SiO 2 -TiO 2 photocatalyst has an anatase crystal structure. After doping of Si and Gd, the absorption wavelength thresholds of the sample approached 407 nm with the energy gap of 3.05 eV. Gd-SiO 2 -TiO 2 photocatalyst showed the degradation efficiency about 90% to methylene blue (MB) under irradiation of simulated sunlight.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiang Wu,Kanghui Ke,Ni Qin,Enzhu Lin,Zihan Kang,Dinghua Bao
The piezo-/photocatalytic effects of ZnO have been in the limelight because of their great potential in environmental remediation and energy conversion. However, the poor recyclability of the suspended catalysts can cause inevitable secondary pollution, which is one of the major issues that limit the practical application of these materials. To address this problem, a magnetically retrievable Fe 3 O 4 @SiO 2 @ZnO nanocomposite was designed and successfully synthesized by multi-step reactions. The ZnO nanorods were vertically grown on the surface of the magnetic Fe 3 O 4 @SiO 2 microspheres , while SiO 2 served as an insulator to protect the inner core and to inhibit charge transfer across the core/shell interface. The Fe 3 O 4 @SiO 2 @ZnO nanocomposite can be easily collected and separated by using a magnetic field. Along with the good recyclability, the material also exhibited high efficiencies in piezocatalytic, photocatalytic and piezo-photocatalytic dye degradation processes. The rate constant of piezo-photocatalysis reached 95.9 × 10 −3 min −1 , which was 2.2 and 6.1 times that of the individual piezocatalysis and photocatalysis , respectively. The present result confirmed the existence of a synergetic effect between piezo- and photocatalytic processes. Hereby, we demonstrated that incorporation of a magnetic carrier is a feasible strategy to achieve retrievable and highly efficient piezo-/photocatalyst.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2025
·
IF 4.3
Wenxi Zhu,Yuhan Luo,Haidong Li,Yufei Gong
In geothermal drilling, the significant rheological deterioration of biopolymer drilling fluids can lead to decreased cutting-carrying efficiency and fluctuations in annulus pressure, which can easily result in unpredictable downhole accidents. To address the challenges, this study innovatively introduces temperature-sensitive monomers (NIPAM) and nanosilica into molecular chains based on temperature response effects and adsorption stability to counteract the negative effects of temperature and salt ions, aiming to develop a rheological agent (PNA-SiO2) that is resistant to high temperature and salt. The molecular structure and thermal stability of PNA-SiO2 were characterized by FT-IR and TGA, and it was demonstrated to have the stability of the molecular main chain within 317 °C. According to rheological and filtration studies, PNA-SiO2 effectively addresses the issues of high-temperature viscosity attenuation and a sharp rise in the filtration volume of bentonite mud by aggressively adsorbing, creating a stable thixotropic network, and enhancing molecular repulsion. After aging at 60–180 °C, the drilling fluid with 2–4% PNA-SiO2 has excellent rheology (AV ≥ 57.5 mPa·s, PV ≥ 42 mPa·s, Gel10 min ≥ 1.533 Pa) and filtration (FLAPI ≤ 9.6 mL) properties that fully satisfy API requirements. The H–B model is the preferred model to accurately describe the rheology behavior of PNA-SiO2 drilling fluids. Moreover, under the comprehensive influence of Na+ on the interlayer spacing of bentonite and the thickness of the diffusion bilayer, PNA-SiO2 has applicability in high-temperature saturated saline water. After aging at 150 °C and 5–36% NaCl, the PNA-SiO2 drilling fluid exhibits stable viscosity (AV ≥ 55 mPa·s, PV ≥ 44 mPa·s) and low filtration volume (≤9.6 mL). In conclusion, PNA-SiO2 is used as a rheological and fluid loss agent, offering a cost-effective solution to the technical issues of severe leakage and inadequate cutting-carrying capacity encountered by geothermal drilling, which enables the safe and quick exploration of geothermal resources.
研究领域:
材料科学
·
石油工程
·
地质学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 9
·6477-6492
·
IF 3.5
Le Fu,Wenjun Yu,Zixu Wen,Jinling Liu
Flash sintering has been used to consolidate a wide range of ceramics and ceramic composites. However, flash sintering of ceramic nanocomposite with a substantial amorphous phase is rarely studied. Meanwhile, the effects of yttrium addition on the flash sintering behaviors and microstructures of ZrO 2 -based ceramic nanocomposite remain unknown. Herein, ZrO 2 -SiO 2 crystalline-amorphous ceramic nanocomposites (CACNs) with different contents of amorphous phase and two types of yttrium dopants were sintered by flash sintering. Results showed that the content of amorphous phase (SiO 2 ) had significant effects on the flash sintering behavior. The CACN with 65 mol% SiO 2 was nonflash sinterable due to the high electric resistivity of SiO 2 , whereas, the CACN with 45 mol% SiO 2 can be flash sintered to high densification within 35 seconds. The flash-sintered CACNs consisted of ZrO 2 nanocrystallites distributed in an amorphous SiO 2 matrix. Flash sintering enhanced the tetragonal-to-monoclinic phase transformation of ZrO 2 . In addition, influences of yttrium dopant on CACNs were also investigated. Yttrium dopants can rapidly dissolve in ZrO 2 lattices and show a tetragonal phase stabilization effect during flash sintering. Firework-like ZrO 2 microcrystallites formed by dendritic growth were observed close to the cathode region, which was attributed to athermal electric field effects and the formation and aggregation of oxygen vacancies at the cathode region. The results would provide guidance for fabricating CACNs via flash sintering.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Enqi Bu,Ying Chen,Chao Wang,Zhengdong Cheng,Xianglong Luo,Riyang Shu,Jingtao Zhang,Mingzheng Liao,Zhiqiang Jiang,Qingbin Song
Photoreforming of bio-derived liquids is anattractive approach toward sustainable H 2 production. Although a large number of bio-liquids are thermodynamically feasible for photocatalytic hydrogen production, few of them have been involved in this process due to their water insoluble nature. To achieve and promote the efficiency of photoreforming hydrogen production in bio-derived biphasic system, the Pickering interfacial catalysis was established over an amphiphilic Ag 2 O-TiO 2 /SiO 2 catalyst. In this case, the Ag 2 O-TiO 2 /SiO 2 sample was synthesized by means of an electrostatic self-assembly method by surface charge regulation of SiO 2 and the surface hydrophobic modification of Ag 2 O-TiO 2 /SiO 2 particles using a Pickering emulsion method. As shown in the results, the amphiphilic Ag 2 O-TiO 2 /SiO 2 particles were observed to successfully stabilize the bio-octanol/water emulsion. Even the complex structure and surface modification slightly reduce the light absorption efficiency and specific surface area of the catalyst, the hydrogen yield was greatly promoted over Ag 2 O-TiO 2 /SiO 2 compared to that of bare TiO 2 , Ag 2 O-TiO 2 and TiO 2 /SiO 2 . It was also discovered that the cyclic hydrogen production performance can be improved by simple re-emulsification. The effect of bio-octanol concentration for photoreforming was studied by a Langmuir-Hinshelwood-type kinetic model, and the reaction rate constant and bio-octanol adsorption constant were obtained. This study shows that photocatalyst after effective surface amphiphilic modification could provide a prospective approach for the hydrogen production from a bio-derived oil/water biphasic system under solar light.
研究领域:
能源科学
·
材料科学
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Yongyuan Deng,Yichao Ye,Tao Yin,Zhipeng Tian,Chao Wang,Ying Chen,Zhi Yang,Junling Tu,Riyang Shu
Hydrodeoxygenation (HDO) is a common refinery process to convert oxygen-containing lignin pyrolysis oil into high-quality hydrocarbon liquid fuels. In this work, we prepared a core-shell Ru@SiO 2 -Al 2 O 3 catalyst and employed it in the HDO of phenolic compounds and lignin pyrolysis oil. The unique core-shell structure of the catalyst reduces the size of Ru metal particles, which significantly improves the hydrogenation catalytic activity. The high surface area, large pore size, and large pore volume of the SiO 2 shell provide a favorable environment for the substrate transfer during the reactions, meanwhile the doped Al 2 O 3 introduces a substantial number of acid sites for the catalysis of deoxygenation. The synergistic effect between the metal sites and acid sites greatly promotes the HDO reaction efficiency. Under mild conditions of 220 °C and 1 MPa H 2 , Ru@SiO 2 -Al 2 O 3 catalyst achieved a guaiacol conversion of 99.9% and a cyclohexane selectivity of 99.9%. This catalyst also demonstrates an outstanding stability, with catalytic activity little loss after 6 recycles. Furthermore, an efficient HDO performance was obtained in the upgrade of other phenolic compounds and lignin pyrolysis oil. At the temperature of 240 °C, the content of hydrocarbons in lignin pyrolysis oil increased from 15.4% to 92.7%. These results indicate that Ru@SiO 2 -Al 2 O 3 holds significant potential for the efficient HDO refinery, providing a promising avenue for the future biofuel development.
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 16
·21472-21482
·
IF 2.478
Yuan Wanli,Sun Kai,Tian Jiahong,Li Yaping,Wang Zongxiang,Liu Boyang,Fan Runhua
Herein a double shells structure was proposed to overcome the drawbacks such as poor heat resistance, incomplete insulation and high core loss coating of iron-based soft magnetic composites (SMCs) with single shell structure. The surface of the iron powder was coated with a double shells structure composed of an inner phosphate coating and an outer SiO 2 coating through phosphating and hydrolysis successively. Subsequently, the effects of different SiO 2 addition amount on the microstructure of iron powder and magnetic properties of SMCs were studied. The introduction of SiO 2 in the double shells structure inhibited the decomposition and failure of phosphating layer after being annealed at a high temperature. The iron powder coated with the phosphate-SiO 2 insulating layer was still effective after annealing in a N 2 atmosphere at 570 °C, achieving the purpose of eliminating residual stress and improving magnetic properties. The optimal process parameters were set at 0.2 wt% phosphoric acid and 0.5 wt% tetraethyl orthosilicate to fabricate the phosphate-SiO 2 double shells. The iron-based SMCs presented excellent magnetic properties with B s of 1.29 T and P s of 169.2 W/kg (measured at 1 T and 1 kHz). In addition, the core loss of SMCs introduced with SiO 2 is 83% lower than that of SMCs produced by the phosphating process. This paper provides a feasible method for improving the magnetic properties of SMCs.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Peng Yi,Pengcheng Liu,Yupeng Wu,Baoping Cai,Zhe Li,Kai Gao
Due to their unique surface characteristics, oil-water separation membranes with superhydrophilic and underwater superoleophobic properties have promising applications in oil-water separation processes. However, the microstructure and chemical composition of the material surfaces are prone to degradation in harsh environments. This article employs nanosecond laser etching to improve the deposition quality of fumed SiO 2 for the fabrication of superhydrophilic and underwater superoleophobic separation membranes. Various analytical methods are used to characterize the separation membranes. Nanosecond laser etching creates rough, ripple-like microstructures on stainless steel mesh, which not only enhances the deposition of fumed SiO 2 but also minimizes the interaction between solids and oil. This results in improved wetting characteristics and underwater oil repellency, significantly boosting both the performance and durability of the membrane. The prepared separation membrane demonstrated an average separation efficiency of 99.4% across five different oil-water mixtures, with all separation fluxes exceeding 58000 L·m⁻²·h⁻¹. After soaking in an acid-base solution for 15 days and undergoing 25 friction tests, the underwater oil contact angle was maintained at 156.3°, demonstrating high separation efficiency and outstanding stability, with significant potential for application, particularly in harsh environments.
研究领域:
材料科学
·
表面工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2022
·Vol. 43
·期 8
·5375-5389
·
IF 3.531
Tingting Wang,Li Yuan,Guozheng Liang,Aijuan Gu
A hybrid architecture system was developed via in situ formation of SiO 2 nanoparticles in the cavities of COOH-terminated hyperbranched aromatic polyester (CHBPE). Results show that SiO 2 nanoparticles can be successfully anchored in the cavities of CHBPE owing to the hyperbranched structure of CHBPE. The resulting CHBPE-SiO 2 system is applied to epoxy (EP) resins using 4,4′-diaminodiphenyl sulfone (DDS) as curing agent. Because –COOH groups in CHBPE-SiO 2 system can react with epoxy groups, the conversion of epoxy groups in EP/CHBPE-SiO 2 systems can be improved, and the strong interface interaction between EP matrix and CHBPE-SiO 2 can be realized. The resulting EP/CHBPE-SiO 2 composites have excellent mechanical property. When the contents of CHBPE-SiO 2 are 8%–20%, the impact strengths, the flexural strengths and the tensile strengths of EP/CHBPE-SiO 2 composites can reach 24–46 kJ/m 2 , 121–165 MPa and 57–71 MPa, respectively, which are 16.1–31.9-fold, 4.0–5.9-fold and 8.9–11.3-fold higher than those of pure EP, respectively. EP/16%CHBPE-SiO 2 composites have the optimal comprehensive mechanical property. The initial thermal decomposition temperature at 5 wt% weight loss ( T di ) and glass-transition temperature ( T g ) of EP composites can increase by 70–84°C and 30–43°C, respectively, after introducing 8%–20% CHBPE-SiO 2 . Moreover, the dielectric constants of EP composites with 8%–20% CHBPE-SiO 2 decrease by 3%–11% as compared to pure EP. The high dispersion of SiO 2 in EP/CHBPE-SiO 2 composite and the strong interface interaction between EP matrix and CHBPE-SiO 2 can contribute to the outstanding comprehensive property of EP/CHBPE-SiO 2 composite.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Dian Wang,Xiang Wan,Jiafei Wang,Debby Mangelings,Qin Xu,Fazhi Xie,Xianhuai Huang,Weihua Li,Han Xuan,Wensheng Zou,Qishu Qu
Background Due to its high chemical stability, sufficient rigidity and zwitterionic ion exchange properties, TiO 2 can be considered as an alternative stationary phase material to SiO 2 for high performance liquid chromatography . TiO 2 stationary phase is usually prepared by coating TiO 2 onto SiO 2 support by sol-gel method. However, in the traditional coating method, in order to overcome the rapid hydrolysis rate of tetrabutyl orthotitanate, only a very low concentration of tetrabutyl orthotitanate can be used, resulting in a low loading of TiO 2 on the support. Results TiO 2 core-shell spheres with a good monodispersity were prepared using 0.25 mol L −1 tetrabutyl orthotitanate. The specific surface area, pore volume , pore diameter and TiO 2 loading of the TiO 2 core-shell spheres were 66 m 2 g −1 , 0.15 cm 3 g −1 , 9.8 nm and 57%, respectively. The core-shell spheres were derivatized with n-octadecyltrichlorosilane and then packed into a stainless steel column to test the separation performance for neutral, basic and acidic samples in liquid chromatography. A baseline separation of polyaromatic hydrocarbons was achieved, showing a column efficiency for fluorene of 118075 plates m −1 . The prepared stationary phase was also used to separate acidic and basic mixtures, and column efficiencies of 54500 and 25836 plates m −1 were obtained for N , N -dinitroaniline and p -chlorophenol, respectively. The relative standard deviations of the retention times of polyaromatic hydrocarbons for run-to-run, day-to-day and column-to-column repeatability were all below 5.1%. Significance and novelty This work demonstrated that TiO 2 can be coated in the pores of the shell of SiO 2 core-shell spheres with high TiO 2 loading using a high concentration of tetrabutyl orthotitanate as the titania source. The experimental results show that the TiO 2 coated core-shell spheres can be a good alternative stationary phase for liquid chromatography.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 10
·2311
·
IF 4.2
Ling Yu,Aiqing Xia,Yongchao Hao,Weitao Li,Xu He,Cuijuan Xing,Zan Shang,Yiwei Zhang
Pyrethroid pesticides (PYRs) have found widespread application in agriculture for the protection of fruit and vegetable crops. Nonetheless, excessive usage or improper application may allow the residues to exceed the safe limits and pose a threat to consumer safety. Thus, there is an urgent need to develop efficient technologies for the elimination or trace detection of PYRs from vegetables. Here, a simple and efficient magnetic solid-phase extraction (MSPE) strategy was developed for the simultaneous purification and enrichment of five PYRs in vegetables, employing the magnetic covalent organic framework nanomaterial COF-SiO2@Fe3O4as an adsorbent. COF-SiO2@Fe3O4was prepared by a straightforward solvothermal method, using Fe3O4as a magnetic core and benzidine and 3,3,5,5-tetraaldehyde biphenyl as the two building units. COF-SiO2@Fe3O4could effectively capture the targeted PYRs by virtue of its abundant π-electron system and hydroxyl groups. The impact of various experimental parameters on the extraction efficiency was investigated to optimize the MSPE conditions, including the adsorbent amount, extraction time, elution solvent type and elution time. Subsequently, method validation was conducted under the optimal conditions in conjunction with gas chromatography–mass spectrometry (GC-MS). Within the range of 5.00–100 μg·kg−1(1.00–100 μg·kg−1for bifenthrin and 2.5–100 μg·kg−1for fenpropathrin), the five PYRs exhibited a strong linear relationship, with determination coefficients ranging from 0.9990 to 0.9997. The limits of detection (LODs) were 0.3–1.5 μg·kg−1, and the limits of quantification (LOQs) were 0.9–4.5 μg·kg−1. The recoveries were 80.2–116.7% with relative standard deviations (RSDs) below 7.0%. Finally, COF-SiO2@Fe3O4, NH2-SiO2@Fe3O4and Fe3O4were compared as MSPE adsorbents for PYRs. The results indicated that COF-SiO2@Fe3O4was an efficient and rapid selective adsorbent for PYRs. This method holds promise for the determination of PYRs in real samples.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）