LANGMUIR
·
2022
·
IF 4.331
Zihan Gu,Zhaomin Li,Zhengxiao Xu,Chao Zhang
In this paper, the microscopic mechanisms and macroscopic characteristics of polymer/nanoparticle foam flooding in a heavy oil reservoir environment were studied. Sodium dodecyl sulfate (SDS) surfactant was used as the foaming agent, and the foam was prepared by a combination of partially hydrolyzed polyacrylamide (HPAM) polymer and SiO2 nanoparticles. By performing experiments with the microscopic model, the foam flooding dynamics in the heavy oil reservoir were simulated. Based on the experiments, the formula model was established to evaluate the physicochemical effects between the foam liquid film and oil surface. Finally, the macroscopic characteristics of foam flooding were studied by performing oil displacement experiments with a 2D visual model. The microscopic experiments demonstrated that the foam liquid film could exert multiple actions, such as adsorption, stretching, and cutting on the heavy oil in the reservoir pores. These actions were accompanied by force changes between the foam and heavy oil, and the addition of polymer and nanoparticles further strengthened them. The calculations of the formula model indicated that the polymer and nanoparticles amplified the force between the foam liquid film and heavy oil by 1.95 and 2.2 times, respectively. The 2D visual model experiments suggested that foam flooding could further develop heavy oil after water flooding through its liquid film effects, and the oil recovery efficiency increased from 42.43 to 57.82%. In addition, the polymer and nanoparticles further optimized the oil displacement effect of the foam liquid film, which made the oil recovery efficiency reach 64.77–68.16%.
研究领域:
石油工程
·
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhuoqun Li,Guangshun Dong,Jian Pan,Xinyu Chen,Xinyu Lou,Lilan Huang,Kai Guo
With the continuous development of environmental protection and resource recycling demands, the development of bio-based separation membrane materials has increasingly attracted attention. Bio-based polyamide 56 (PA56), exhibiting excellent hydrophilicity, spinnability, and mechanical properties, is expected to complement and replace traditional separation membrane materials. In this study, the electrospinning preparation and structural control of PA56 nanofiber membranes were achieved through the optimization of PA56 content and mixed solvent ratios. The study found that when the PA56 content was 16 wt% and the formic acid to acetone ratio in the mixed solvent was 8:2, the nanofiber diameter distribution was the most uniform. Building on this, amino-functionalized modified silica (SiO 2 –NH 2 ) nanoparticles were introduced to prepare PA56/SiO 2 –NH 2 composite nanofiber membranes featuring a cobweb-like nanofiber network and micro-nodule structure. The effects of the addition of SiO 2 –NH 2 nanoparticles on the morphology, structure, and properties of the fiber membranes were studied. The results indicate that the control of the mixed solvent ratio and the addition of SiO 2 –NH 2 nanoparticles led to the formation of a cobweb-like nanofiber network and micro-nano nodular structure on the nanofiber surface, enhancing the hydrophilicity of PA56 nanofiber membranes. The M − 3 membrane with a nanoparticle addition amount of 0.8 wt% exhibited high hydrophilicity and underwater superoleophobic properties, achieving efficient separation of stable oil-in-water emulsions with a separation efficiency of 99.8 %. This work provides a new bio-based membrane material and its preparation method for treating oily wastewater using the membrane separation method.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 26
·5707-5721
·
IF 5.344
Mingdi Sun,Dan Yang,Wu Fanqi,Zhao Wang,Hongjiao Ji,Zhiliang Liu,Shili Gai,Fangmei Zhang,Piaoping Yang
Photodynamic therapy (PDT) is a light-based modality for tumor treatment that involves the generation of reactive oxygen species (ROS) by the combination of light, a photosensitizer, and molecular oxygen. Nevertheless, the therapeutic effects of PDT are limited by hypoxic conditions that worsen with oxygen consumption during the PDT process. Photo/chemodynamic therapy (PCDT) based on the Fenton reaction is one strategy to improve ROS generation, provided a highly effective Fenton reagent is developed. In this research, SiO2@Cu7S4 nanotubes (NTs) were synthesized as a PCDT agent. This double-valence metal-sulfide composite material can react with H2O2 at the tumor site. SiO2@Cu7S4 NTs can produce more ROS than the traditional PDT agents, and besides, they can also be used as a photothermal therapy (PTT) agent. SiO2@Cu7S4 NTs will trigger the PTT effect under 808 nm irradiation and generate a large amount of heat to eradicate cancer cells. This heat will also promote the PCDT effect by increasing the reaction rate. Thus, the SiO2@Cu7S4 NT is a suitable material for PCDT and PTT synergistic oncotherapy. The 808 nm laser is selected as the appropriate excitation source, providing adequate penetration and minimal harm to normal cells. The experimental data presented herein demonstrate the promising photosensitive, Fenton-like, and photothermal performance of SiO2@Cu7S4 NTs. Furthermore, the findings could promote the development of PCDT and PTT synergistic therapy. Thus, this research provides a feasible method to design a single, multifunctional material for cancer treatment.
研究领域:
肿瘤学
·
材料科学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Haibo Ding,Haopeng Zhang,Qinshan Xie,Ali Rahman,Yanjun Qiu
Wax crystals may continuously precipitate from the asphalt binder during the cooling process, which seriously damages the low-temperature cracking resistance of the pavement. At present, few researchers have developed wax inhibitors (WIs) to hinder wax crystallization of the asphalt binders. In this paper, a novel wax Inhibitor was synthesized by the hybridization of organically modified Nano-SiO 2 to the poly (methyl methacrylate) (PMMA), and the modification effect was validated by the ninhydrin chromogenic method and thermogravimetric analysis . The optimum content and composition of the organic nano-SiO 2 hybrid PMMA WIs were also determined by the rheological tests, including viscosity measurement , wax precipitation temperature (WPT), and yield stress tests. Moreover, the wax inhibition mechanism was predicted by the combination of differential scanning calorimetry (DSC) and polarized optical microscopy (POM) tests. According to the obtained results, the successful modification of nano-SiO 2 and PMMA were represented by the blue-violet precipitation and improved high temperature stability of PMMA, respectively. The optimal content and composition of nano-SiO 2 hybrid PMMA was determined as 200 ppm and mass ratio of 1:4 (nano-SiO 2 to PMMA), respectively. Compared with the co-crystallization between PMMA and wax crystals, the introduction of nano-SiO 2 provided an additional and more stable heterogeneous nucleation template, which further reduced the size, and increased the dispersion of the wax crystals. Consequently, it is promising to develop the nanocomposites as WIs in the asphalt binder.
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
PETROLEUM SCIENCE AND TECHNOLOGY
·
2023
·
IF 1.5
Yan Chen,AL-Maamari Zaher Adel,Yahan Wang,Yunjie Wang,Gavkhara Ismoilova
The foam performance of hydrophilic nanoparticles SiO2/SDS (Sodium Dodecyl Sulfonate) foam about temperature and salinity had been assessed by experiments. The concentration of Na+, Ca2+, and Mg2+ ions on foaming volume and foam half-life were verified, and the mixing dispersions with Na+, Ca2+, and Mg2+ concentration of 8:1:1 was researched the IFT, elastic modulus and foam strength by FoamScan for plugging ability. The mixing dispersions of no salinity and Na+, Ca2+, and Mg2+ of 8:1:1 were used to verify the salinity effects on foam properties by building hydrophilic SiO2 nanoparticles at the Gas-liquid interface. The flooding ability of two different foam dispersions was compared to enhance oil recovery. The flooding ability of two surfactant dispersions to oil molecules was verified by building the oil flooding models. In conclusion, the best foam performance condition was 30°Cand the sensitivity to hydrophilic SiO2/SDS dispersions could be summed up as: Ca2+> Mg2+ > Na+, hydrophilic SiO2/SDS foam dispersions with Na+, Ca2+, Mg2+ concentration of 8:1:1 had better foam stability and plugging ability at the salinity of 7.5 × 104∼12.5 × 104mg/L. The oil recovery increased from 53.62% to 68.54%, and simulation results showed that the removal of oil molecules was more efficient in mixed dispersions.
研究领域:
石油工程
·
材料科学
·
界面化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Li Li,Xinhong Chen,Xia Xiong,Xiaoping Wu,Zinan Xie,Zuohua Liu
The development of a simple and environmentally friendly method to synthesize hollow TiO 2 structures is urgent for realizing high NIR reflectance and low thermal conductivity . Hollow TiO 2 @SiO 2 structures have been successfully synthesized by a recycling template method. The synthesis process involves four steps as follows: 1) preparation of SiO 2 spheres, 2) synthesis of SiO 2 @TiO 2 core-shell structure by coating mesoporous TiO 2 shell on SiO 2 and crystallization by calcination , 3) etching the SiO 2 @TiO 2 to form the hollow TiO 2 spheres, and 4) coating the hollow TiO 2 spheres with a SiO 2 protection layer to produce hollow TiO 2 @SiO 2 structures. The SiO 2 serves as a template to support and synthesize hollow TiO 2 shell, and then after being etched, to form a Na 2 SiO 3 solution as a coating agent to protect TiO 2 shell from photocatalytic activity. The as-synthesized hollow TiO 2 @SiO 2 structures not only have high NIR reflectance, but also have a high thermal barrier performance due to the hollow structure. Moreover, the NIR reflectance of the coating made from hollow TiO 2 @SiO 2 reached 94.9%, and the temperature of the inner surface of the coating board is reduced about 16 °C, compared with the surface without coating. The weather resistance studies reveal that the hollow TiO 2 @SiO 2 sample is very stable under the UV irradiation. In particular, the hollow TiO 2 @SiO 2 structures synthesized by using this method shows multifunctional responses towards solar heat.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Chuanyi Liu,Wenlong Xu,Cheng Wang,Dong Ma,Zhihui Zeng,Na Wu
In industrial explosion accidents, mechanical shock waves and flame thermal radiation are the main destructive factors, posing serious threat to life and property. Current designs mainly focus on one of these factors, so it is necessary to develop protective materials against both destructive factors. TPP (Triphenyl phosphate) - SiO 2 Aerogel synergistically modified polyurea composites were developed in this work, which process excellent mechanical shock wave mitigation performance and enhanced flame retardancy. The mechanical shock wave mitigation experiments were conducted on Multi-purpose Shock Cannon (MSC), Human Tissue Equivalent Target (HTET) and full-scale human head model, which comprehensively evaluated the protective performance of polyurea composites for the human body. The flame retardancy was assessed through thermal conductivity, LOI, thermal gravimetric and small flame experiment. The combustion residue was analyzed using SEM, EDS, Raman spectroscopy, and XPS technologies, revealing flame retardant mechanism of TPP-SiO 2 Aerogel synergistically modified polyurea composites. The results showed that the TPP-SiO 2 Aerogel synergistically modified polyurea composites achieved the highest mitigation ratios of overpressure peak and acceleration peak at 13.20% and 60.87%, respectively, superior to those of fiber-enhanced polymer composites (Fiber-PE, Fiber-PA6, Fiber-ASA), single filler polyurea, wood and PLA plastic. The flame retardancy was effectively improved, with the highest LOI reaching 24.9%, far higher than that of pure polyurea (19.6%). It particularly enhanced the carbonization performance of polyurea composites during combustion, eliminating burning material dropping phenomenon. The thermal insulation performance was also elevated, with the lowest thermal conductivity reduced by 58.6% compared to pure polyurea.
研究领域:
材料科学
·
安全工程
·
燃烧学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 9
·6422-6438
·
IF 3.5
Wenjun Yu,Zihua Lei,Xiaoyu Zhang,Qinzhao Zhang,Yongxing Cheng,Ying Deng,Yang Li,Junjie Song,Le Fu
Ceramics can be traditionally classified as structural and functional ones. However, the miniaturization and multi-functionalization of various devices require ceramics to have both structural and functional properties. In this work, we aimed to develop structure-function integrated ZrO 2 –SiO 2 nanocrystalline glass–ceramics (NCGCs) by in situ formation of homogenously distributed amorphous carbon. By reducing the calcination temperature of carbon-containing powder, organic carbon groups were partially retained in the powder and they transformed to amorphous carbon in the sintered NCGCs. At micrometer scale, the carbon was homogenously distributed in the NCGCs, avoiding the commonly encountered agglomeration problem of carbon fillers. The effects of carbon on the microstructure, mechanical properties, wear resistance, and dielectric properties of the NCGCs were investigated. Results showed that the in situ formed amorphous carbon was homogenously distributed in the ZrO 2 nanocrystallites. Meanwhile, the amorphous carbon strongly bonded with the ZrO 2 –SiO 2 NCGCs. Only a small amount of carbon was combusted even after annealing at 1000°C for 3 h. The formation of amorphous carbon led to an improvement of nanohardness and wear resistance of the NCGCs, while slightly reducing Young's modulus and flexural strength. The electromagnetic wave transmission performances were improved due to the formation of amorphous carbon. The current study paves a new way for developing structure-function integrated glass–ceramics through in situ formation of carbon. The prepared structure-function integrated ZrO 2 –SiO 2 NCGCs have great potential to be used as radome and antenna windows of aerospace aircrafts that work in harsh environment.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Haiye Wang,Xinzhen Zhao,Chunju He
The polydimethylsiloxane modified silica (SiO 2 -g-PDMS) nanoparticles with hydrophilic core and hydrophobic shell are employed for the hybridization modification of PVDF ultrafiltration membrane to improve the separation and antifouling performances. The results suggest the modified SiO 2 -g-PDMS nanoparticles exhibit improved dispersion and significant amphiphilic characteristics, and the wetting properties of membrane surface and mimetic matrix of hybrid PVDF membranes are distinctly different with the contact angle values at 105° and 15°, respectively. In addition, the added SiO 2 -g-PDMS nanoparticles significantly improve the fouling repulsion and fouling release properties of hybrid PVDF membranes, the anti-adsorption ability and water flux recovery ratio (FRR-W) of hybrid PVDF membranes to the two typical pollutants of bovine serum albumin (BSA) and humic acid (HA) have been significantly improved. This article aims to provide a simple way to improve the antifouling performance of PVDF ultrafiltration membrane with dual-mode multi-functional modifier.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
·
2022
·Vol. 61
·期 18
·e202117201
·
IF 16.823
Jiaqi Si,Guofeng Zhao,Weidong Sun,Jincun Liu,Cairu Guan,Yong Yang,Xue-Rong Shi,Yong Lu
Graphical For the oxidative coupling of methane (OCM) reaction, the MnO x -Na 2 WO 4 /SiO 2 catalyst enriched with Q 2 units in the SiO 2 carrier achieves 23 % CH 4 conversion and 72 % C 2–3 selectivity at 660 °C. A large number of Q 2 units in MnO x -Na 2 WO 4 /SiO 2 is a trigger for markedly lowering the light-off temperature of the Mn 3+ ↔Mn 2+ redox cycle because of the easy formation of MnSiO 3 . Oxidative coupling of methane (OCM) catalyzed by MnO x -Na 2 WO 4 /SiO 2 has great industrial promise to convert methane directly to C 2–3 products, but its high light-off temperature is the most challenging obstacle to commercialization and its working mechanism is still a mystery. We report the discovery of a low-temperature active and selective MnO x -Na 2 WO 4 /SiO 2 catalyst enriched with Q 2 units in the SiO 2 carrier, being capable of converting 23 % CH 4 with 72 % C 2–3 selectivity at 660 °C. From experiments and theoretical calculations, a large number of Q 2 units in the MnO x -Na 2 WO 4 /SiO 2 catalyst is a trigger for markedly lowering the light-off temperature of the Mn 3+ ↔Mn 2+ redox cycle involved in the OCM reaction because of the easy formation of MnSiO 3 . Notably, the MnSiO 3 formation proceeds merely through the SiO 2 -involved reaction in the presence of Na 2 WO 4 : Mn 7 SiO 12 +6 SiO 2 ↔7 MnSiO 3 +1.5 O 2 . The Na 2 WO 4 not only drives the light-off of this cycle but also gets it working with substantial selectivity toward C 2–3 products. Our findings shine a light on the rational design of more advanced MnO x -Na 2 WO 4 based OCM catalysts through establishing new Mn 3+ ↔Mn 2+ redox cycles with lowered light-off temperature.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2022
·Vol. 43
·期 8
·5087-5094
·
IF 3.531
Hongbo Hou,Zejun Pu,Xu Wang,Rongli Zhu,Xianyong Li,Jiachun Zhong
In this study, WPU@SiO 2 nanoparticles were obtained by grafting waterborne polyurethane (WPU) on the surface of silicon dioxide (SiO 2 ). Then, WPU@SiO 2 nanoparticles were introduced into the matrix of polybutylene succinate (PBS) to prepare a series of PBS/WPU@SiO 2 composites. The dispersibility and interfacial compatibility of filler and matrix can be improved obviously by grafting a layer of WPU onto the surface of SiO 2 nanoparticles. The FTIR and TGA results showed that WPU was successfully grafted onto the surface of SiO 2 . According to polarizing microscope images, it is clear that the size of the pure PBS crystals is much larger than that of the PBS/WPU@SiO 2 , and a large number of crystals are evenly distributed in the PBS/WPU@SiO 2 composite. In addition, DSC and TGA results indicated that PBS/WPU@SiO 2 composite films show excellent thermal properties. Meanwhile, the initial thermal decomposition temperature of PBS/WPU@SiO 2 composite films is about 366–374°C. For the 10 wt% WPU@SiO 2 reinforced PBS-based composite films, the tensile strength reached the ultimate value (38.49 MPa), which is 32.04% higher than that of pure PBS. Based on its excellent mechanical and thermal properties, the PBS/WPU@SiO 2 composites have a broad application prospect in the field of biodegradable materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Nian Li,Zi-jian He,Jia-hui Zhao,Zhi-dong Zhao,Xing-rui Qi,Hao-dong Wang,Bo Liu,Hua-jie Lai,Tao Jin
Developing magnetic adsorbent that combines the merits of quick response, excellent enrichment capacity, uniform and stable dispersivity is of paramount importance in pollutants pretreatment. In this work, tunable strawberry-like Fe 3 O 4 @SiO 2 -NH 2 @Au@ 2-ME magnetic solid phase extraction materials were prepared via assembly method. The obtained nanocomposites were characterized using scanning electron microscopy, X-ray diffraction spectroscopy, infrared spectroscopy , X-ray photoelectron spectroscopy, and whereafter the preparation method was optimized. Integrating magnetic solid-phase extraction with high-performance liquid chromatography and fluorescence detection , a comprehensive enrichment and detection method toward bisphenol A (BPA) was well established. This method demonstrated high efficiency and rapidity, achieving rapid enrichment of BPA. The as-developed method exhibited good linear correlation within the range of 10.0–500 μg·L −1 , with a recovery of 85–92%. It showed excellent sensitivity and reproducibility in BPA extraction with low limit of detection (LOD, 0.274 μg·L −1 ), limit of quantitation (LOQ, 0.913 μg·L −1 ) and relative standard deviation (RSD, 1.5%, n = 6), respectively. The proposed Fe 3 O 4 @SiO 2 -NH 2 @Au nanoplatform firmly supports the envision that proper surface functionalization of magnetic substrate could promote the enrichment capacity toward various pollutants in actual application scenarios.
研究领域:
环境科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）