CERAMICS INTERNATIONAL
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2016
·
IF 2.758
An-Nan Chen,Jia-Min Wu,Meng-Yue Liu,Li-Jin Cheng,Jing-Yan Chen,Huan Xiao,Xiao-Yan Zhang,Chen-Hui Li,Yu-Sheng Shi
Rapid in-situ solidification of SiO 2 suspension under the joint action of releasing calcium ions and shifting pH has been proposed. When the suspension was heated up to 60 ℃, decomposition of calcium iodate which released calcium ions , as well as hydrolysis of diacetate (GDA) which shifted the pH toward the isoelectric point, both contributed to the solidification of suspension. The controlled coagulation of SiO 2 suspension could be realized via controlled release of high valence counter ions and pH shift at 60 ℃ within 30 min, which could considerably shorten the coagulation time compared with present reported results (1–3 h). Green body prepared by heating the SiO 2 suspension with 6.5 g L −1 calcium iodate and 2.0 vol% GDA at 60 ℃ for 30 min shows uniform microstructure with compressive strength of close to 0.3 MPa. SiO 2 ceramics sintered at 1275 ℃ for 3 h possess homogeneous microstructure with bulk density of 2.06 g cm −3 and flexural strength of 40.3 MPa.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Jiabao Zang,Haifeng Li,Qingzhi Zhu,Ziheng Wang,Hubuli Bazaerbieke,Li Sun,Meijie Zhang
There are few reports about the electromagnetic wave (EMW) absorption properties of α−SiC based composites, and almost all of them focus on β−SiC polymorphs. In this study, α−SiC p /α−SiC nw /SiO 2 /C hybrid composites (sample SiC−C1500) with heterostructure α−SiC nanowires (α−SiC nw ) of multiple interfaces 4H−SiC/6H−SiC/SiO 2 /C were successfully prepared using mixed powder (α−SiC+m−SiO 2 +C) as raw material based on the heterogeneous nucleation−growth mechanism, and their microwave absorption properties were investigated. Meanwhile, the samples SiC−V2150 and Si−C1500 were obtained by vacuum calcination (α−SiC+m−SiO 2 +C) at 2150 0 C and carbothermal reduction (Si+m−SiO 2 +C) at 1500 0 C, respectively, and their phase compositions were α−SiC p /C and β−SiC p /β−SiC nw /SiO 2 /C, respectively. The sample SiC−C1500 exhibited excellent EMW absorption properties, with a minimum reflection loss (RL min ) value of −18.37 dB at a thickness of 1.3 mm, and a maximum effective absorption bandwidth (EAB max ) value of 4.9 GHz at a thickness of 1.5 mm. In contrast, the EMW absorption performance of the samples SiC−V2150 and Si−C1500 was obviously poor, which was consistent with the RCS (Radar Cross−Section) simulation results. The formation of α−SiC p /α−SiC nw /SiO 2 /C composites (sample SiC−C1500) containing 4H−SiC/6H−SiC/SiO 2 /C multi-interfaces heterostructure α−SiC nanowires (α−SiC nw ) was analyzed. The excellent EMW absorption performance of SiC−C1500 sample could be attributed to the effective regulation of α polymorphs, nanowire heterostructure, multi−component hybridization. This study supplies a helpful experience and reference for improving the high temperature EMW absorption performance of SiC matrix composites.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 410
·期 2
·441-449
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IF 3.431
Li Yuanyuan,Zhu Nan,Ma Yulong,Li Qiang,Li Peng
Material with a core–shell structure based on a porous silica core and Ag nanoparticles (AgNPs) as shell (SiO 2 @Ag) was prepared with the seed growth method. Cellulose derivatives as chiral selectors were coated on the surfaces of SiO 2 @Ag particles by means of coating and intermolecular polycondensation as chiral stationary phases (CSPs), respectively. Fifteen racemates were used to evaluate their chiral recognition ability by high-performance liquid chromatography (HPLC). The results implied that the CSPs based on SiO 2 @Ag particles obtained stronger interaction with the analytes leading to better enantioseparation due to the existence of AgNPs on the surfaces of silica gel, compared with a cellulose derivative-modified silica column. In addition, the new CSPs showed special selectivity for ketone enantiomers, and AgNPs played a synergistic effect with cellulose derivatives on enantioseparation.
Schematic of SiO 2 @Ag stationary phase
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APPLIED SURFACE SCIENCE
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2009
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IF 1.576
J.C. Chen,W.Q. Luo,H.D. Wang,J.M. Xiang,H.F. Jin,F. Chen,Z.W. Cai
A versatile method was developed for the chain-end functionalization of the grafted polymer chains for surface modification of nanoparticles with functionalized groups through a combination of surface-initiated atom-transfer radical polymerization (ATRP) and Huisgen [3 + 2] cycloaddition. First, the surface of SiO 2 nanoparticles was modified with poly(methyl methacrylate) (PMMA) brushes via the “grafting from” approach. The terminal bromides of PMMA-grafted SiO 2 nanoparticles were then transformed into an azide function by nucleophilic substitution. These azido-terminated PMMA brushes on the nanoparticle surface were reacted with alkyne-terminated functional end group via Huisgen [3 + 2] cycloaddition. FTIR and 1 H NMR spectra indicated quantitative transformation of the chain ends of PMMA brushes onto SiO 2 nanoparticles into the desired functional group. And, the dispersibility of the end-functional polymer-grafted SiO 2 nanoparticles was investigated with a transmission electron microscope (TEM).
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Journal of Nanomaterials
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2011
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IF 1.675
Hong Zhang,Chao Li,Jinshan Guo,Limin Zang,Jiahe Luo
Poly(methyl methacrylate)/SiO2 (PMMA/SiO2) hybrid composites were prepared via “grafting onto” strategy based on UV irradiation in the presence of iron aqueous solution. Two steps were used to graft polymethyl methacrylate (PMMA) onto the surface of nanosilica, anchoring 3-(methacryloxy) propyl trimethoxysilane (MPTS) onto the surface of nanosilica to modify it with double bonds, and then grafting PMMA onto the surface of nanosilica with FeCl3 as photoinitiator. The products were characterized by FT-IR, TGA, TEM, DLS, and XPS. The results showed that it is easy to graft PMMA onto the surface of nanosilica under UV irradiation, and the hybrid particles are monodisperse and have core-shell structure with nanosilica as the core and PMMA layers as the shell. Furthermore, the products initiated by FeCl3 have higher monomer conversion, percent grafting, and better monodispersion compared with the products initiated by traditional photoinitiator such as 2-hydroxy-4-(2-hydroxyethoxy)-2-methyl-propiophenone (Irgacure 2959).
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Agriculture-Basel
·
2025
·Vol. 16
·期 1
·
IF 3.6
Jianrong Zhao,Yuanhao Zhang,Fuxin Liu,Songling Chen,Hongbao Wu,Ruilin Huang
Spent mushroom substrate (SMS)-derived bio-based polyurethane coatings typically exhibit poor hydrophobicity and short nutrient release durations, limiting their ability to satisfy long-term crop requirements. This study developed improved controlled-release urea by preparing water-repellent and compact bio-polymer coatings from recyclable SMS using non-toxic siloxane and nano-SiO2modifiers through simple processes. The dual modification markedly reduced water absorption (from 6.60% to 4.43%) and porosity (from 6.32% to 3.92%), creating a dense coating with lotus-leaf-like nanoscale surface protrusions and fewer intermembrane pores. As a result, the nitrogen (N) release period of the dual-modified bio-polymer-polyurethane-coated urea (SBPCU) with a 7% coating thickness was extended from 23 days to 42 days. Phytotoxicity assessments confirmed the excellent biosafety of the bio-polymer coating, revealing no adverse effects on maize growth and even promotional effects at low concentrations. This approach offers a sustainable, eco-friendly, and scalable strategy for producing bio-polymer-coated urea from agricultural waste, serving as a viable alternative to petrochemical coatings while improving nutrient use efficiency and biosafety.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Lei Teng,Chuan Yue,Ganwei Zhang
Epoxied SiO 2 nanoparticles and polyethyleneimine (PEI) was used to coating polyvinylidene fluoride (PVDF) membrane for improved anti-fouling, oil water separation , dye and heavy metal ions removal capabilities. Characterization of the modified membrane revealed that the hydrophilic coating layer was applied onto the PVDF substrate successfully. The modified membrane can exhibit a high degree of superhydrophilicity and underwater superoleophobicity. Consequently over 98% of the oil was retained when this membrane was used in oil water separation. The hydrophilic coating layer enhanced the membrane antifouling performance, and its flux recovery rate reached 96.3% after filtration and washing with bovine serum protein solution (BSA). In addition, the modified membrane presented the ability to adsorb organic dyes and heavy metal ions in water and reject them via filtration. Most importantly, the crosslinking reaction between the epoxied SiO 2 nanoparticles and PEI imparts a high degree of stability to the coating layer. Thanks to the simple fabrication method and multifunctional performances of the coating layer described in this report, it may be used to modify other substrates.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
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IF 3.8
Ran Ran,Hanwen Yan,Guoliang Zhang,Zengxi Li,Gang Wang,Gongying Wang,Weiguang Su,Chunshan Li
Supported Cs-based catalysts are considered as potential candidates for methyl methacrylate (MMA) synthesis via one-step aldol condensation, but they suffer from low activity. In this paper, the acid–base properties of the Cs/SiO2 catalyst were modulated by loading different amounts of the Al element. The changes in structural and physicochemical properties following Al introduction were revealed by a series of characterizations. In-depth investigation of the catalytic mechanism through in situ DRIFT combined with DFT calculations unveiled the synergistic effects between the Al and Cs components on the promotion of catalytic performance. The results showed that the presence of Al species facilitated the formation of weak and medium acid and base sites, along with the dispersion of the active Cs component, leading to an improvement of MMA yield. Additionally, the kinetic studies indicated that the addition of Al efficiently reduced the activation energy in comparison to pristine Cs/SiO2.
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ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Chen Xu,Jing Li,Shimeles Addisu Kitte,Guohua Qi,Haijuan Li,Yongdong Jin
Electrochemiluminescence (ECL) by virtue of its controllability and versatility has emerged as a significant tool in bioassay, but how to integrate it with other (nano)materials and further break the limit of sensitivity for ultrasensitive detection still possess tremendous potential. Herein, a close-packed Ru@SiO2 NP nanomembrane that serves as an enhanced substrate and luminophore enricher simultaneously was constructed by the liquid–liquid interface self-assembly method and applied for ECL-enhanced bioassay. The developed ECL electrode obtained ∼600-fold enhancement on ECL intensity compared with the bare ITO electrode and ∼21-fold enhancement compared with the SiO2 NP nanomembrane electrode due to the dramatic light scattering of the 2D SiO2 NPs and the enrichment of Ru(bpy)32+ molecules on the surface of the Ru@SiO2 NP nanomembrane electrode. Based on the fascinating Ru@SiO2 NP nanomembrane platform, we further constructed a label-free immunosensor for the detection of prostate-specific antigen (PSA). The as-fabricated Ru@SiO2-nanomembrane ECL immunosensor exhibited good stability and performed ultrasensitive detection with an utmost low detection limit of 0.169 fg·mL–1 (signal/noise = 3). Our work puts forward an effective solution benefiting for further improving ECL performance for ultrasensitive bioassays.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Fu Yang,Xu Hu,Shuying Gao,Xianfeng Liu,Shijian Zhou,Yan Kong
Herein, we report a facile synthetic method enabling the synchronously activated decoration of the inner core and mesoporous outer shell of monodispersed Fe 3 O 4 @meso-silica using in situ implanted MnO x . This approach can maintain the catalytic activity of the internal core without loss of its inherent magnetic properties even when undergoing calcination . The developed catalyst exhibits a well-defined core-shell configuration with a MnO x coating on an Fe 3 O 4 internal core and a MnO x -modified mesoporous outer shell, obtained via only a one-pot output cycle. The thin MnO x coating layer prevents excess oxidation of the unoxidized Fe 3 O 4 core during the annealing process. Additionally, the mesopores in the coated silica were synchronously functionalized by the assistance of dodecylamine (DDA) as surfactant because of the coordination effect of Mn 2+ and DDA molecules. The optimal nanocatalyst exhibits improved catalytic activity for styrene oxidation and recoverability due to its magnetic-responsive properties, in contrast to postsynthesized and shell-only functionalized catalysts.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 7
·1453-1465
·
IF 3.286
Niazi Sobia,Khan Imran Mahmood,Yan Lv,Khan Muhammad Issa,Mohsin Ali,Duan Nuo,Wu Shijia,Wang Zhouping
A rapid and highly sensitive time-resolved fluorescence (TRF)-based aptasensor for simultaneous recognition of mycotoxins ochratoxin A (OTA) and fumonisin B 1 (FB 1 ) was developed using multi-color, Ln 3+ -doped time-resolved fluorescence nanoparticles (TRF-NPs) (NaYF 4 : Ce, Tb and NH 2 -Eu/DPA@SiO 2 NPs) coupled with complementary strand DNA (cDNA) as luminescence probe and aptamers-conjugated amine-functionalized Fe 3 O 4 magnetic nanoparticles (MNPs) act as a capture probe. Under the optimized conditions, the time-resolved fluorescence intensities at 544 and 618 nm corresponded with Tb 3+ and Eu 3+ , respectively, were used to measure FB 1 ( Y = 19,177.1 + (− 12,054.4) x , R 2 = 0.9917) and OTA ( Y = 4138.8 + (− 11,182.6) x , R 2 = 0.9924), respectively. The limits of detection (LODs) for FB 1 and OTA were 0.019 pg mL −1 and 0.015 pg mL −1 , respectively, which were much lower than previously described methods for simultaneous recognition of mycotoxins OTA and FB 1 while detection range varied from 0.0001–0.5 ng mL −1 . This aptasensor was effectively applied to quantity FB 1 and OTA in maize samples and results were compared with ELISA method. This is the first reported time-resolved fluorescence (TRF)-based aptasensor to detect two agriculturally important toxins in the maize. The developed aptasensor has potential to be used for detection of toxins in food safety fields.
Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 13
·1-14
·
IF 2.8
Rahman Taqi Ur,Chen Xiangrong,Zhang Tianyin,Song Jiale,Hong Zelin,Yin Kai,Awais Muhammad,Paramane Ashish
This study explores an efficient encapsulation strategy to improve the dielectric insulation properties of epoxy (EP) composites. The integration of different concentrations of BST@SiO 2 into the EP matrix markedly enhances the overall performance of the composites, particularly under high-temperature conditions and diverse electric fields. The core–shell structure, where barium strontium titanate (BST) particles are coated with an insulating silica shell, serves to reduce DC electrical conductivity, prevent space charge accumulation, and improve DC breakdown strength. The silica coating restricts the movement of charge carriers, while the positive temperature coefficient (PTC) characteristics of BST further enhances insulation properties by transitioning to an insulative state near the Curie temperature. The electrical double-layer effect in the composite helps to suppress excessive charge injection through Coulombic repulsion, preventing the formation of high local electric fields, which are often a direct cause of electrical breakdown. This mechanism ensures higher breakdown strength by delaying the occurrence of critical local fields. The encapsulated BST@SiO 2 particles provide improved thermal stability, contributing to the composite’s ability to retain superior dielectric properties at elevated temperatures. The reported methodology for fabricating these nanocomposites offers valuable insights into developing EP-based materials with enhanced insulation properties, particularly for high-performance applications.
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