ENERGY & FUELS
·
2022
·
IF 4.654
Daofan Wang,Han Jia,Qiuxia Wang,Xiaolong Wen,Ziwei Wei,Qiang Wang,Fangning Fan,Shijie Wen,Kaihe Lv,Dexin Liu
The stability of the foam directly impacts the final efficiency of the foam flooding in enhanced oil recovery (EOR). In the present work, a series of Janus SiO2-n nanoparticles (JSn NPs) with various modification degrees were successfully prepared and employed to improve the stability of the nonionic surfactant polyethylene glycolmonoisodecylether (PMIE)-stabilized foam. The PMIE–JS3 system with a much low JS3 NP concentration (0.1 wt %) displayed extraordinary foamability and stabilizing foam ability via the foam volume, half-life, relative volume decay, and optical microscope photograph measurements. Then, the dynamic surface tension and dilatational viscoelasticity tests were conducted to explore the mechanism. It was found that the PMIE–JS3 system with great interfacial activity and intensive interfacial film highly facilitated the generation of the foam and improved the foam stability. Moreover, the PMIE–JS3-stabilized foam exhibited outstanding stability, even under the influence of crude oil. The sandpack flooding tests indicated that the PMIE–JS3-stabilized foam could effectively plug the high-permeability channels to modify the water injection profile and consequently greatly enhanced tertiary oil recovery (∼15.3% of the initial oil in place).
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高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Yaohui Xu,Yang Zhou,Wenhui Ma,Shixing Wang,Shaoyuan Li
The Fe 3 O 4 nanoparticles [NPs] coated with silica nanoparticles were designed to produce magnetic core–shell Fe 3 O 4 @SiO 2 NPs, which were modified with rhodamine B derivatives and defined as Fe 3 O 4 @SiO 2 -Rho NPs. The obtained Fe 3 O 4 @SiO 2 -Rho NPs served as a fluorescent OFF-ON nanosensor was utilized to detect Zn 2+ selectively in acetonitrile medium. The Fe 3 O 4 @SiO 2 -Rho NPs exhibited selective “turn-on” type fluorescent enhancements and distinct color changes with Zn 2+ . The Fe 3 O 4 @SiO 2 -Rho NPs also showed a high capacity for removal of Zn 2+ at room temperature. The removal efficiency toward Zn 2+ was about 87.34%. In addition, the presence of magnetic Fe 3 O 4 particles as core in Fe 3 O 4 @SiO 2 -Rho NPs could facilitate the magnetic separation of the Fe 3 O 4 @SiO 2 -Rho-Zn 2+ from the solution.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Ruiyi Fan,Huiyu Min,Xingxing Hong,Qingping Yi,Wei Liu,Qinglin Zhang,Zhengrong Luo
In this paper, a new core-shell nanostructured magnetic bio-based composite was prepared by immobilizing persimmon tannin (PT) onto Fe 3 O 4 @SiO 2 microspheres, and the as designed Fe 3 O 4 @SiO 2 @PT was utilized for adsorptive recovery of Au(III) and Pd(II). The preparation, morphology, composition and magnetic property of Fe 3 O 4 @SiO 2 @PT were characterized. Adsorption parameters of Fe 3 O 4 @SiO 2 @PT towards Au(III) and Pd(II) including initial pH, reaction time, initial concentration of metal ions , effect of acidity and interference of coexisting metal ions were investigated. It is sufficiently confirmed that silica was coated on Fe 3 O 4 and persimmon tannin was immobilized on aminated Fe 3 O 4 @SiO 2 . The thickness of silica and loaded persimmon tannin are around 18 nm and 14 nm, respectively. With only 1.00 wt% of persimmon tannin, however, the maximum adsorption capacities of Fe 3 O 4 @SiO 2 @PT for Au(III) and Pd(II) were as high as 917.43 and 196.46 mg·g −1 , respectively. In addition, after adsorption of Au(III) and Pd(II), the magnetization saturation values ( Ms ) of Fe 3 O 4 @SiO 2 @PT were high enough to guarantee efficient magnetic seperation. Metallic gold could be facilely recovered from wastewaters containing Au(III).
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 21
·7211-7220
·
IF 7.059
Qinzhao Sun,Jiping Wang,Lixue Zhang,Pu Mao,Shujuan Liu,Liqiang He,Fang Kang,Rong Xue
The choice of dielectric fillers and structure design play an important role in improving the energy storage properties of polymer-based nanocomposites. In this work, a class of sandwich-structured poly(vinylidene fluoride) (PVDF)-based nanocomposites with an insulating layer containing 1D NaNbO3@SiO2 nanowires was prepared using simple casting and hot-pressing methods. 1D NaNbO3 nanowires coated with a SiO2 insulating layer were introduced into the polymer matrix to form a central layer, which has high insulation and low dielectric permittivity. Consequently, the sandwich-structured nanocomposites with 9 vol% 0D BaTiO3 nanoparticles and 1 vol% 1D NaNbO3@SiO2 nanowires exhibit a high discharge energy density of ∼20 J cm−3 at 450 MV m−1 as well as a high discharge efficiency of 75%, indicating a combination of high energy density and high efficiency compared with the systems of all-polymer composites or polymer-based nanocomposites. The dielectric analyses and simulation results indicate that the improved energy storage density and discharge efficiency are attributed to the effect of insulating layers containing 1D NaNbO3@SiO2 nanowires. The findings of this work demonstrate that introducing insulating layers containing 1D nanofillers with high insulation and low permittivity can have a positive effect in improving energy storage performance of dielectric polymer-based nanocomposites.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yuxuan Zhao,Yueli Wen,Xiaonuo Xu,Maohong Fan,Shiyun Guo,Zhiju Chen,Xiaoxiao Zhao,Bin Wang,Wei Huang
The heavy metals discharged from electroplating wastewater, represented as copper and chromium ions, is harmful to aquatic lives and human beings, and will break the ecological balance. In this work, magnetic hybrid porous structure adsorbent of Fe 3 O 4 @SiO 2 -UiO-66-EDTA is prepared for recycling copper and chromium ions. The adsorbent exhibits a maximum adsorption capacity of 212.10 mg/g for Cu(II) and 118.10 mg/g for Cr(VI). Notably, it shows excellent regenerability of 87.12% after 5 cycles. The adsorption of Cu(II) and Cr(VI) on Fe 3 O 4 @SiO 2 -UiO-66-EDTA follows the pseudo-second-order model, where chemical adsorption is dominant and it occurs spontaneously and exothermally. Based on XRD, FTIR, XPS, and DFT calculations, the adsorption mechanisms are driven by electrostatic attraction, chelation, and redox reactions. This work provides a novel and promising strategy for designing highly efficient adsorbents, paving the way for more effective treatments of electroplating wastewater contaminated with Cu(II) and Cr(VI).
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR MEDICINE
·
2015
·Vol. 36
·期 5
·1282-1290
·
IF 2.088
Bin Gao,Lei Shen,Ke-Wu He,Wei-Hua Xiao
The aim of the present study was to examine the apoptosis of the hepatocellular carcinoma cell line, HepG2, induced by treatment with folic acid-conjugated silica-coated gold nanorods (GNRs@SiO2-FA) in combination with radiotherapy, and to determine the involvement of apoptosis-related proteins. An MTT colorimetric assay was used to assess the biocompatibility of GNRs@SiO2-FA. The distribution of GNRs@SiO2-FA into the cells was observed using transmission electron microscopy (TEM). HepG2 cells cultured in vitro were divided into the following 4 groups: i)the control group (untreated), ii) the GNRs@SiO2-FA group, iii) the radiotherapy group (iodine 125 seeds) and iv) the combination group (treated with GNRs@SiO2-FA and iodine 125 seeds) groups. The apoptosis of the HepG2 cells was detected by flow cytometry. The concentration range of <40 µg/ml GNRs@SiO2-FA was found to be safe for the biological activity of the HepG2 cells. GNRs@SiO2-FA entered the cytoplasm through endocytosis. The apoptotic rates of the HepG2 cells were higher in the GNRs@SiO2-FA and radiotherapy groups than in the control group (P<0.05). The apoptotic rate was also significantly higher in the combination group than the GNRs@SiO2-FA and radiotherapy groups (P<0.05). Taken together, these findings demonstrate that the combination of GNRs@SiO2-FA and radiotherapy more effectively induces the apoptosis of HepG2 cells. These apoptotic effects are achieved by increasing the protein expression of Bax and caspase-3, and inhibiting the protein expression of Bcl-2 and Ki-67. The combination of GNRs@SiO2-FA and radiotherapy may thus prove to be a new approach in the treatment of primary liver cancer.
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Long Cheng,Kui Wang,Shanyong Wang,Hailong Lu,Chunmin Xu,Jun Ye
As the main by-product of chemical pulping, lignosulfonate is mostly burned directly as fuel with low added value. Therefore, the conversion of lignosulfonate into multifunctional porous carbon materials is necessary for green sustainable development and practical applications. In this work, the pore size of sodium lignosulfonate-based porous carbons (LBCs) was regulated by green activator HCOOK and mesoporous manufacturing agent SiO 2 for the first time. The formation of micropores is beneficial to the improvement of surface area and adsorption performance, while the development of mesopores accelerates the mass transfer rate, but its adsorption performance is lower than that of micropores. The developed pore structure, sufficient oxygen content and graphene structure of LBCs lead to high adsorption performance for norfloxacin (NOR), reaching 341.9 mg g −1 . Characterization and Density functional theory (DFT) results show that the sorption process includes pore filling, π-π stacking, hydrogen bond and electrostatic interaction. In addition, pore volume and surface diffusion model (PVSDM) confirm that surface diffusion dominates the adsorption process. The above results provide an important reference value for the preparation and application of high-performance lignin-based adsorbents.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jingxuan Cai,Qiang Ren,Sen Liu,Xuerui Wang,Chunmei Zhang,Kaiyuan Mei,Xiaowei Cheng
Currently, the encapsulated organic phase change materials (PCMs) used in cementing slurries for NGH layers have problems such as difficulty in realizing applications, poor compatibility with cement slurries after leakage, and contamination of the environment at the bottom of the well. Furthermore, there is a dearth of perceptive investigation about the impact of PCMs on the hydration mechanism of cement. This study presents a new idea of using inorganic hydrated salt PCMs to control the heat released of cementing slurries during the hydration process. For the first time, sodium sulfate decahydrate-type composite inorganic hydrated salt PCMs (FH) loaded with SA-SiO 2 were synthesized and analyzed. The effect of FH on cement hydration mechanism was investigated and the changes of cement hydration products were analyzed qualitatively and quantitatively. The results showed the phase transition temperature of FH varied between 20.83 and 43.45 ℃, accompanied with a significant latent heat of phase change of 117.93 J/g. This attribute has the capacity to greatly reduce the rise in temperature during the process of cement hydration and the overall total release of heat. FH did not modify the cement hydration mechanism, but it extended the NG stage and reduced the hydration effect of the I stage, resulting in an increased level of hydration. FH improves the hydration procedure for cement, resulting in an augmented production of calcium-silicate-hydrate (C-S-H) compounds and enhances the compaction and arrangement the C-S-H. The inclusion of FH in the cement slurry did not lead to the dissociation of NGH during the hydration process.
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高影响因子
Environmental Science-Nano
·
2025
·
IF 5.1
Pengju Ren,Yihan Chi,Lijuan Wang,Yuanyuan Tang
This study investigated the aggregation of polystyrene (PS) NPs by kinetics experiments, considering single, simultaneous, and sequential addition of silica (SiO2) nanoparticles and metal cations. Results demonstrated that ion concentration and strength played a crucial role in determining PS stability across all systems. Surface interaction forces, particularly van der Waals forces, were fundamental mechanisms for PS aggregation. In simultaneous addition system, SiO2 improved PS stability. The higher the concentration of SiO2, the more significant its stabilizing effect on PS, as SiO2 competed with PS for metal cations. DLVO calculations and zeta potential analyses suggested that electric double layer repulsion was primary factor behind PS stabilization by SiO2. Additionally, other non-DLVO forces, such as hydrogen bonding and π-π interactions, might also affect the stabilization. SiO2 was found to promote PS aggregation in the sequential addition system, contrasting with its stabilizing effect in the simultaneous addition system. The increase in aggregate size was primarily attributed to the bridging effects, though the enhanced electrostatic repulsion prevented a substantial rise in aggregate size. This study highlights how the presence of non-plastic particles influences the environmental behavior of NPs and deepens our understanding of the interactions between PS NPs and SiO2 in complex and realistic aqueous environments.
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高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2012
·
IF 3.696
Jiebing Ma,Peng Huang,Meng He,Liyuan Pan,Zhijun Zhou,Lili Feng,Guo Gao,Daxiang Cui
Development of multimodal contrast agents for in vivo simultaneous multimodality imaging is an emerging interdiscipline that is paving the avenue toward the goal of personalized medicine. Herein, folic acid-conjugated silica-modified LaF3:Yb,Tm upconversion nanoparticles (UCNPs@SiO2-FA) with high La content in a single particle were strategically designed and prepared for simultaneously targeting dual-modality imaging of upconversion luminescence (UCL) and X-ray computed tomography (CT). LaF3 UCNPs were synthesized by a novel oleic acid (OA)/ionic liquid (IL) two-phase system. Afterward, a folic acid molecule was covalently anchored on the surface of UCNPs with a silane coupling agent. The UCNPs@SiO2-FA exhibits good stability, water dispersibility and solubility, low cytotoxicity, good biocompatibility, highly selective targeting, excellent X-ray attenuation, and UCL emission under excitation at 980 nm. In vivo UCL and CT images of mice show the UCNPs@SiO2-FA can be used in targeting dual-modality imaging. These results suggest that the as-prepared nanoprobe is a good candidate with excellent imaging and targeting ability for targeting dual-modality imaging of UCL and CT.
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PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Yongde Ma,Rengan Liang,Wenquan Wu,Jiayin Zhang,Yanning Cao,Kuan Huang,Lilong Jiang
Developing catalysts with not only hydrogenation activity but also cracking activity is very important for the advancement of suspended-bed hydrocracking technology. Within this respect, MoS 2 /SiO 2 -Al 2 O 3 bifunctional catalyst is a kind of typical catalysts with both hydrogenation and cracking activity. Herein, a series of Zr-doped SiO 2 -Al 2 O 3 mixed oxides were synthesized by a sol-gel coupled with hydrothermal method. The synthesized mixed oxides were characterized for chemical structures and acidic properties. It is found that doping SiO 2 -Al 2 O 3 with Zr atoms significantly increases the numbers of acidic sites. The Zr-doped SiO 2 -Al 2 O 3 mixed oxides were then combined with dispersed MoS 2 , which was in-situ produced from oil-soluble Mo precursors, to fabricate a novel kind of bifunctional catalysts for suspended-bed hydrocracking of heavy oils. Owing to the significantly increased numbers of acidic sites in Zr-doped SiO 2 -Al 2 O 3 mixed oxides, corresponding bifunctional catalysts demonstrate much enhanced activity for suspended-bed hydrocracking of heavy oils in relative to MoS 2 /SiO 2 -Al 2 O 3 bifunctional catalysts.
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高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 28
·10537-10546
·
IF 4.052
Guofeng Liu,Yeqing Chen,Mochen Jia,Zhen Sun,Binbin Ding,Shuai Shao,Fan Jiang,Zuoling Fu,Ping'an Ma,Jun Lin
Rare earth ion-doped fluoride upconversion nanoparticles (UCNPs), emerging as a novel class of probes and drug carriers, exhibit superior promise for bio-applications in diagnostics and treatment on account of their strong luminescence, fine biocompatibility, and high drug loading. However, the fine control and manipulation of particle size and the distribution of rare earth ion-doped oxides has remained an insurmountable challenge to date. In this work, we construct and synthesize silica-coated Gd2(WO4)3:Yb3+/Ho3+ nanoparticles by one-pot co-precipitation, with uniform distribution (∼130 nm) and enhanced yellow fluorescence. Particularly, the nanoparticles not only possess outstanding temperature sensing performance at biological temperatures in water by utilizing the fluorescence intensity ratio (FIR) method, but also allow a further serviceable contrast effect in vitro and in vivo based on the prominent T1-weighted magnetic resonance (MR) signal of Gd3+. Compared with cisplatin and platinum(IV) (DSP), the Gd2(WO4)3@SiO2 nanoparticles functionalized with DSP (Gd2(WO4)3@SiO2-Pt-PEG) exert higher lethality against CT26 cells and significantly inhibit the growth of tumors at the same concentration of Pt. This effect occurs through the greater level of cell endocytosis. The lethality value of the latter is 10 times higher than the former after the same length of time according to inductively coupled plasma-mass spectrometry (ICP-MS) results. In short, the monodisperse and strongly fluorescent Gd2(WO4)3@SiO2-Pt-PEG nanoparticles are endowed with dual-mode imaging, temperature sensing and anticancer functions, which provide a significant guide for synthesis and bio-application of lanthanide ion-doped oxides.
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PubMed
高影响因子
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