Journal of Biomaterials and Tissue Engineering
·
2014
·Vol. 4
·期 12
·1047-1053
·
IF 1.167
Wu Gang,Huang Chao,Li Hong,Ke Yu,Fang Guan-Yu,He Jia-Zhi,Wang Si-Han,Chunlin Deng
In this study, PEG–CaO–SiO2–P2O5 hybrid materials were synthesized by the triethosysilane-propyl end caped polyethylene glycol (PEG), teraethylorthosilicate (TEOS), triethyl phosphate and calcium nitrate tetrahydrate using a two-step
method. The telechelic PEG was first synthesized by the reaction of PEG with isocyanatopropyl triethoxysilane (IPTS). Then, PEG–CaO–SiO2–P2O5 hybrid materials were synthesized by using sol–gel method. Transmission electron microscopy
(TEM) revealed that the phase structure of the hybrid material changed from organic dominated to inorganic dominated when the PEG content decreased. The size of the dispersed phase is about several microns observed by TEM. Bioactivity tests employed by soaking the specimen in simulated body
fluid (SBF) indicated that hydrophilic polymer contents have no adverse effect on the hydroxyapatite formation. After soaking the hybrid samples in SBF for 2 days, the deposition with the characteristic diffraction peaks of hydroxyapatite was presented on the hybrid material. It's also noticed
the deposition amounts increased with the inorganic contents increasing in the hybrid materials. Mechanical tests displayed no brittle cracks were developed in all the hybrid material samples. The compressive strength of the hybrid materials increased while the elastic deformation decreased
with the polymer contents reduction in the hybrid materials.
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RSC Advances
·
2017
·Vol. 7
·期 35
·21758-21767
·
IF 3.108
Yali Bai,Zhenhuan Li,Bowen Cheng,Maliang Zhang,Kunmei Su
U–TiO2 is successfully coated with SiO2 and subsequently well modified by APTES, and the core–shell structure exists on TiO2@SiO2 and TiO2@SiO2/APTES, which greatly reduces aggregation of the TiO2 nanoparticles. The photocatalytic activities of U–TiO2, TiO2@SiO2, and TiO2@SiO2/APTES are evaluated using MB decomposition. Nearly 50% of the MB is degraded after 15 min in the presence of the U–TiO2 under UV radiation (300 W), and only 17.44% and 4.18% of the MB is degraded in the presence of the TiO2@SiO2-0.6 and TiO2@SiO2/APTES-1. However, TiO2@SiO2/APTES-0.6 and TiO2@SiO2-0.2 exhibit excellent UV absorbance capacities, and the TiO2@SiO2/APTES-0.6 achieves 80% of the UV-shielding ability of U–TiO2. Poly(p-phenylene sulfide) (PPS) is an easily photodegraded material and TiO2/PPS is more seriously photodegraded than PPS, however, the TiO2@SiO2/APTES nanoparticles can effectively protect the PPS from UV degradation, owing to their lower photocatalytic activities, higher UV-shielding abilities and easy dispersion in the PPS matrix. The breaking strength retention rate of the 1 wt% TiO2@SiO2/APTES/PPS film shows a maximum increase of 38.26%, and the breaking elongation retention rate increased by 41.64% at 2 wt% TiO2@SiO2/APTES loading. These results reveal that the incorporation of the TiO2@SiO2/APTES nanoparticles into the PPS matrix imparts excellent anti-UV properties to the PPS matrix, leading to a mechanical performance improvement.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Xiaobin Zhan,Guanghui Zhu,Lei Yu,Ruyi Hu,Yiru Ren,Hongyong Jiang
To improve the bonding strength of CFRP/Al joints, a novel hierarchical interface through anodization, ZnO nanosheet growth and improved Resin Pre-Coating (RPC) with nano-SiO 2 is designed and its hierarchical failure mechanisms are studied. Porous Al substrates are prepared via anodization, followed by in-situ growth of ZnO nanosheets and infiltration of RPC solution containing nano-SiO 2 to enhance mechanical interlocking at nano-scale. Systematic characterizations including single-lap shear testing, SEM and XRD are conducted to evaluate interfacial morphology, wettability and mechanical properties. Results show that optimal porous surface microstructure and interfacial wettability are obtained by the effect analysis of anodizing time. In surprise, the combined treatment of ZnO nanosheets and improved RPC with nano-SiO 2 shows an increase in the shear strength over 400 % compared to untreated joints. Macro and micro failure modes reveal that the interfacial failure is transitioned to cohesive failure with fiber tearing and resin/SiO 2 interface debonding. The synergistic strategy effectively improves the hierarchical failure through enhanced nano-interlocking and adhesive reinforcement, offering a promising pathway for designing and manufacturing high-strength CFRP/Al joints.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Tong-Yang Song,Zhao-Xia Dong,Jian-Dong Song,Xiao-Xia Wang,Guan-Qun Xie,Meng-Fei Luo,Ji-Qing Lu
Dehydrochlorination of 1, 1, 2-trichloroethane was performed on SiO 2 supported alkali metal (Na. K, Cs) and transition metal (Mn, Ni, Zn) catalysts. The surface basicity or acidity of the catalyst exerted great influence on catalytic behaviors. The catalysts with higher amount of base or acid sites resulted in higher activity due to more adsorption sites for reactant. The basic catalysts (Cs/SiO 2 and K/SiO 2 ) tended to form vinylidene chloride with a selectivity up to 80 %; the neutral catalysts (Na/SiO 2 and SiO 2 ) tended to form 1, 2-dichloroethene with a selectivity up to about 80 %; the acidic catalysts (Zn/SiO 2 , Mn/SiO 2 and Ni/SiO 2 ) tended to form 1, 2-dichloroethene with a selectivity up to 96 %. Proposed reaction mechanisms included an E1cb mechanism with a carbanion intermediate on the basic catalysts, an E2 concerted mechanism on the neutral catalysts, and an E1 mechanism with a carbonium intermediate on the acidic catalysts.
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International Journal of Polymeric Materials and Polymeric Biomaterials
·
2021
·
IF 2.604
Chang Liu,Mengdi Sheng,Tingting Wei,Jihong Sun,Shiyang Bai,Xia Wu
The fluorescent temperature-sensitive mesoporous materials with core-shell structured feature were synthesized through self-assembly method, in which, bimodal mesoporous SiO2 materials (BMMs) were used as a core and poly(N-isopropyl acryl-acrylamide)-co-poly(acrylic acid) as a shell. Especially, the 2-[3-(triethoxysilyl) propyl-1H-Benz][de]isoquinoline-1,3(2H)-dione (PID) as fluorescent molecule was cooperated into the BMMs by one-pot (doped) or two-step (grafted) methods. Using ibuprofen as a model drug, and the PID-doped P@BMMs and PID-grafted P@BMMs as the carriers, the drug releasing performances show the strong fluorescent properties and temperature-responsive behaviors. These results suggest that the prepared fluorescent nanocomposites should be a promise drug carrier for a potential drug delivery.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 4
·2079-2086
·
IF 1.134
Hu Xiangna,Bian XingZhong,Yu Shaozhou,Dan Kun
A magnetic Fe3O4@SiO2@Ag@COOH nanoparticle (NPs)/Au film was fabricated as an effective surface-enhanced Raman scattering (SERS) substrate through a combination of a solvothermal reaction, the Stöber method and an in-situ reaction. The superparamagnetic
property of Fe3O4@SiO2@Ag and the decoration with –COOH groups allow efficient enrichment and capture of thiabendazole molecules. A large quantity of sub-10 nm gaps emerge when Ag NPs are decorated on the surface of the SiO2 shell, offering
a dramatic electromagnetic field enhancement induced by localized surface plasmon resonance (LSPR). Finite-difference time-domain (FDTD) simulations show that strong near-field enhancement around the gap areas between the Ag NPs and Au film occurs, which is caused by the coupling between the
LSPR of the Ag NPs and surface plasmon polaritons (SPPs) of the Au film. Due to the superparamagnetic property and high electromagnetic field enhancement, the Fe3O4@SiO2@Ag@COOH NPs/Au film as a SERS substrate can detect 1 μg/L thiabendazole in solution,
showing great potential for SERS detection of environmental pollutants.
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DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 19
·8867-8875
·
IF 4.197
Yu Chen,Qihua Wang,Tingmei Wang
We demonstrate the fabrication of yolk–shell catalysts consisting of a single M (M = Ag, Au) nanoparticle encapsulated within a hollow mesoporous organosilica shell via an organosilane-assisted strategy. The advantages of our method lie in its good controllability of the void space as well as the thickness of the mesoporous shell. The M@CTAB/SiO2 synthesized through a modified Stöber method can transform to yolk–shell structures after adding (3-aminopropyl)trimethoxysilane (APTMS)/TEOS or (3-aminopropyl)triethoxysilane (APTES)/TEOS into the synthetic medium. We give unambiguous evidence that the middle CTAB/SiO2 layer transforms into a less dense APTMS-rich organic–inorganic layer which was selectively removed in alkaline aqueous solution, while the amino-functionalized hybrid shells remain intact. Moreover, we discuss the role of alkylamino groups in the shell in the transformation from Ag@SiO2 nanorattles to hollow structures when impregnating the as-synthesized Ag@SiO2 nanorattles in HAuCl4 aqueous solution. The nanorattles also exhibit high catalytic activity for the catalytic reduction of p-nitrophenol.
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PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Lijian Liu,Haihua Wang,Xixi Hao,Qinghua Zhang,Guiqiang Fei,Yihao Duan,Liyu Sun
Durable superhydrophobic coating has become frequently investigated and reported, however, achieving concurrent mechanical robustness, long-term anti-corrosive and anti-fouling functionalities remains a formidable challenge. In this study, a polymer nanocomposite coating was created through the star crosslinking of polyhedral oligomeric silsesquioxane (POSS) and fluorinated polyimide (FPI) prepolymer. Subsequently, a superhydrophobic bilayer was created by using the aforementioned coating as base coating, hydrophobic polyolefin (POA) with high toughness and strong adhesive was selected to binder fluoride-modified SiO 2 nanoparticles (F-SiO 2 ) to construct robust superhydrophobic topcoat and simultaneously enhance the interfacial bonding between topcoat and base coating. Notably, the bilayer superhydrophobic coating exhibited robust mechanical durability, retaining its superhydrophobicity even after 100 cycles of sandpaper friction and 80 cycles of tape peeling. After a 50-day salt spray test, the superhydrophobic FPI/POSS@POA/F-SiO 2 bilayer coating demonstrated exemplary corrosion resistance, the low frequency impedance modulus (|Z| 0.01Hz ) was still as high as 7.04 × 10 10 Ω·cm 2 , which is one order of magnitude higher than that of FPI/POSS-4 coating (3.17 × 10 9 Ω·cm 2 ) and three orders of magnitude higher than pure FPI coating (1.82 × 10 7 Ω·cm 2 ). In addition, the superhydrophobic coating also demonstrated self-cleaning and anti-fouling properties. The enhanced comprehensive performance for the superhydrophobic FPI/POSS@POA/F-SiO 2 bilayer coating can be ascribed to the improved compactness and physical barrier resulted from the POSS star crosslinking, as well as the strong inhibitory effect endowed by the robust superhydrophobic surface. This study offers a fresh perspective on the preparation of superhydrophobic bilayer coatings with outstanding long-term anti-corrosive and anti-fouling attributes, showcasing their potential and prospective practical applications.
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高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Lingli Xu,Jingbo Chen,Jing Zhu,Tianxiang Li,Chaoyun Shi
Recently, SiO 2 has attracted increasing attention as an anode material for lithium-ion batteries (LIBs) owing to its low cost and high theoretical specific capacity. However, its inherent poor conductivity limits its practical application. To address this issue, nanostructured material design is considered an effective solution. Herein, based on the traditional ammonium tartrate template-directed sol-gel method, we use low-cost and easily available L-tartaric acid in place of D, L-tartaric acid to prepare high-yield silica nanotubes (SNTs) with a thin wall (ca. 50 nm), small diameter (ca. 150 nm), rough surface and open ends, as well as tiny spongy-like silica nanoparticles (SNPs) by adjusting the feeding amount and feeding mode of NH 4 OH solution. The electrochemical characterization results suggest that the SNTs show better cyclability and rate performance than the SNPs, which maintain a reversible capacity of 741.3 mAh g −1 after 500 cycles at a current density of 0.4 A g −1 and deliver a high rate capacity of 819.4 mAh g −1 at a high current rate of 2 A g −1 . The excellent electrochemical performance suggests that hollow one-dimensional hollow nanotubes are more efficient in improving the electrochemical performance of SiO 2 than zero-dimensional nanoparticles , and SNTs with thin tube walls and rough surfaces are demonstrated to be fascinating and promising anode materials for LIBs.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Shiqiang Wang,Changkun Qiu,Huiyun Jiang,Yan Jin,Haozhi Wang,Liang Zhu
An Au film–PIL nanohole–SiO 2 nanosphere–Au nanosphere SERS substrate integrated with machine learning was fabricated. • Dual electromagnetic enhancement was realized by waveguide modes of hybrid structure and LSPR of Au nanospheres. • PIL nanoholes around Au nanospheres promoted PAHs adsorption through hydrophobic effect and π-π stacking interaction. • The PCA-SVM model achieved over 95% prediction accuracy for PAHs of various concentrations and species in river water. Surface-enhanced Raman spectroscopy (SERS) is a promising trace detection technique, yet its practical application in environmental pollutant analysis remains severely restricted by insufficient electromagnetic enhancement and weak adsorption capacity toward target analytes. Herein, a novel hybrid SERS substrate with dual electromagnetic enhancement and highly efficient molecular enrichment was facilely fabricated, featuring a hierarchical structure of Au film–poly(ionic liquid) (PIL) nanohole–SiO 2 nanosphere–Au nanosphere. In this system, the waveguide optical modes of the Au film–PIL nanohole–SiO 2 nanosphere structure induce the primary electromagnetic enhancement, while Au nanospheres are precisely positioned in the primary enhancement regions to deliver a secondary electromagnetic enhancement through localized surface plasmon resonance (LSPR), thereby realizing a high enhancement factor of 2.35 × 10 7 for pyrene. Meanwhile, PIL nanoholes facilitate specific adsorption and enrichment of polycyclic aromatic hydrocarbons (PAHs) within hotspots via the hydrophobic effect and π-π stacking interactions, significantly amplifying the SERS response of analytes. The hybrid substrate exhibits excellent analytical performance, with limits of detection (LODs) as low as 5.33 × 10 −10 mol/L for pyrene and 3.97 × 10 −10 mol/L for anthracene, respectively. Furthermore, a combined principal component analysis (PCA) and support vector machine (SVM) algorithm was employed to efficiently extract spectral features and reduce data dimensionality, achieving a prediction accuracy exceeding 94% for varying concentrations and species of PAHs in actual river water samples. Taken together, the combination of this hybrid SERS substrate and the PCA-SVM algorithm provides a novel sensing platform, enabling ultrasensitive, accurate, and intelligent trace-level detection of environmental pollutants in complex matrices. Download: Download high-res image (185KB) Download: Download full-size image
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Catalysis Science & Technology
·
2026
·
IF 4.2
Jianyi Liu,Jialei Liu,Yang Yang,Jianhao Guo,Xiaofeng Xue,Ning Zhao,Yibin Zhan,Tiedong Xie,Boping Liu,Yulong Jin
Support modification is a simple but effective method to promote olefin polymerization catalysts, which is often correlated with enhanced acidity. Here, following this rule, the bimetallic catalyst CrOx/VOx/silica for UHMWPE/HDPE in-reactor blends was modified by alumina, sulfate, and alumina/sulfate. All modified catalysts were promoted notably, with ethylene polymerization activities about twice that of the unmodified one. Similarly, NH3-TPD and FTIR-pyridine confirmed their enhanced acidity. Theoretical studies emphasized the importance of Lewis acidic Al³⁺ site, which induced geometric and electronic rearrangement of the active site, thus reducing steric hindrance and improving LUMO reactivity. Sulfation further strengthened Al³⁺ acidity, exacerbating rearrangement and lowering the insertion barrier. Contrary to expectations, the alumina/sulfate-modified catalyst—with much stronger Brønsted and Lewis acidity—was only moderately promoted. XPS, DRS UV-vis, elemental analysis, and DFT results indicate that, while modification improves metal center electron deficiency and facilitates ethylene insertion, stronger acidity also weakens the anchoring of Cr(VI) and V(V) active precursors and promotes inactive Cr(III) and V(III) species. This effect was more pronounced for the superacidic alumina/sulfate modifier, partially counteracting its promotional effect.
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Toxics
·
2026
·Vol. 14
·期 4
·304
·
IF 4.9
Jiaxin Liu,Saeed Rad,Junfeng Dai,Cheng Chang,Chongmin Liu
Traditional nano-titanium dioxide films have strong photocatalytic performance; however, their hydrophilic surfaces make it easier for pollutants or by-products resulting from the reaction processes to deposit on the membrane surface and occupy their active sites, which reduces the coating degradation efficiency and shortens their service life. In the current study, nano-TiO 2 was mixed with SiO 2 for hydrophobic film coating by the sol–gel method. The surface morphology of the membrane was observed by scanning electron microscopy (SEM), the composition of the coating was analyzed by X-ray diffraction (XRD), and its stable hydrophobicity was verified by contact angle testing (θ w = 117°). The specific surface area Brunauer–Emmett–Teller (BET) revealed between 0.0561 (for 3 layers) and 0.0868 m 2 /g after 9 layers of coating. Through establishing a simplified photocatalytic reactor under UV, the new coating’s abilities in the degradation of methylene blue, its anti-fouling, and durability were examined. Results revealed that when the common TiO 2 films were combined with hydrophobic films, nearly 100% of methylene blue was degraded, and the degradation capacity remained stable after three rounds of tests. Moreover, it was observed that only a small amount of methylene blue adhered to the new film surface comparatively. Outcomes confirmed that the SiO 2 -mixed TiO 2 thin films exhibited enhanced hydrophobicity. When integrated with ordinary TiO 2 coatings, the composite structure demonstrated superior photocatalytic efficiency and stability in the degradation of aqueous pollutants compared to pure TiO 2 coatings.
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高影响因子
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