Nano Research
·
2022
·Vol. 16
·期 5
·6048-6056
·
IF 10.269
Wu Yining,Tang Lisha,Cao Mengjiao,Li Li,Liu Kai,Kong Demin,Zhao Qingshan,Jin Xu,Liu He,Dai Caili
Zero-dimensional (OD) carbon dots exhibit excellent potential as a new oil-displacing agent for unconventional reservoir development. However, the difficulty in size/surface properties control and unclear mechanism hinder their further applications. In this study, amino-modified carbon dots (am-CDs) for oil displacement were facilely synthesized through the rapid polymerization of D-glucose (D-Glc) and 3-aminopropyltriethoxysilane (APTES). The size of am-CDs could be precisely controlled by the reaction condition and quenching achieved by adjusting the pH value to neutral. The surface amine groups endow am-CDs with excellent hydrophilicity and dispersion stability. The 0.30 wt.% nanofluid based on am-CDs with an average size of 2.6 ± 0.040 nm showed remarkable oil recovery efficiency (54.09%) without the addition of surfactant. The oil recovery efficiency of am-CDs is much higher than those of water flooding (30.25%), nano-SiO 2 flooding (36.45%), and amino-free carbon dots (af-CDs) flooding (37.80%). Experimental and theoretical results reveal that am-CDs can be favorably adsorbed on the core surface to modulate the micro-scale wettability, changing the surface from oil-wet to relatively uniform water-wet. Meanwhile, am-CDs can effectively reduce the adhesion force between alkanes and sandstone surfaces, contributing to oil droplets peeling off and oil displacement. This study provides a new strategy for developing efficient carbon dots-based nanofluids for enhanced oil recovery.
研究领域:
材料科学
·
石油工程
·
纳米技术
·
化学工程
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2024
·Vol. 16
·期 8
·891-898
·
IF 0.9
Shi Yurou,Dou Peng,Fu Gaojie,Xie Chenyan,Shen Bin
Adsorption is intensively considered to be the most feasible and economical option for aged transformer oil treatment. In this work, five aminated hyper-crosslinked polymers were prepared from chloromethylated polystyrene–co-divinylbenzene (Cl-PS-DVB) through a two-stage modification
of crosslinking and five different reagents aminating. After modification, the specific surface area (SBET) and nitrogen content (CN) of prepared resins were greatly improved. To evaluate the reclamation performance of resins for removing oxides and contaminants from
aged transformer oils, the total acid number (TAN) and color of oils were mainly examined. The results shown that the prepared resins have superior oil reclamation capacity compared to commercial resin XAD-4 due to their higher microporous specific surface area (Smic) and surface
polarity. Among them, the NHC-R3, which used dimethyltriamine (DETA) as an aminating agent, had the best deacidification and decolorization performance. A series of experiments were designed to investigate the optimal regeneration program conditions for NHC-R3, and the additional electrical
characteristics of the reclaimed oil, including breakdown voltage, dielectric dissipation factor (DDF), and interfacial tension, were measured as evidence that aged oil was successfully reclaimed.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Shanshan Feng,Jingshuai Gao,Shouzhu Li,Xun Cao,Jie Ni,Xiuli Yue,Wei Zheng,Yuyao Li,Xueqi Hu,Yao Zhang,Sheng Feng
To improve the selective separation performance of silica nanofibers (SiO 2 NFs) for cesium ions (Cs + ) and overcome the defects of Prussian blue nanoparticles (PB NPs), PB/SiO 2 -NH 2 NFs were prepared to remove Cs + from water. Among them, 3-aminopropyltriethoxysilane (APTES) underwent an alkylation reaction with SiO 2 , resulting in the formation of a dense Si-O-Si network structure that decorated the surface of SiO 2 NFs. Meanwhile, the amino functional groups in APTES combined with Fe 3+ and then reacted with Fe 2+ to form PB NPs, which anchored firmly on the aminoated SiO 2 NFs surface. In our experiment, the maximum adsorption capacity of PB/SiO 2 -NH 2 NFs was 111.38 mg/g, which was 31.5 mg/g higher than that of SiO 2 NFs. At the same time, after the fifth cycle, the removal rate of Cs + by PB/SiO 2 -NH 2 NFs adsorbent was 75.36% ± 3.69%. In addition, the adsorption isotherms and adsorption kinetics of PB/SiO 2 -NH 2 NFs were combined with the Freundlich model and the quasi-two-stage fitting model, respectively. Further mechanism analysis showed that the bond between PB/SiO 2 -NH 2 NFs and Cs + was mainly a synergistic action of ion exchange, electrostatic adsorption and membrane separation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
COLORATION TECHNOLOGY
·
2021
·Vol. 137
·期 4
·348-360
·
IF 1.614
Chenglong Wang,Kai Yan,Xun Luo,Shulan Jin,Lili Wang,Jun Luo,Jinhuan Zheng
Polyurethane acrylate-based titanium dioxide was used to prepare blue light-curable inks as both a white pigment to replace the original white pigment and as an oligomer. The polyurethane acrylate-based titanium dioxide was fabricated using a two-step method. In the first step, the titanium dioxide was grafted with γ-aminopropyltriethoxy silane, and the grafting process was studied. Second, amino-modified titanium dioxide was used to prepare polyurethane acrylate-based titanium dioxide, which was then used to configure the blue light-curable polyurethane acrylate-based titanium dioxide ink. Fourier Transform–infrared spectroscopy indicated that the amino-modified titanium dioxide and polyurethane acrylate-based titanium dioxide were prepared successfully. The content of the amino groups on the surface of the amino-modified titanium dioxide could be effectively controlled by adjusting the pH value. Moreover, by increasing the content of the amino groups, the viscosity decreased and the photopolymerisation efficiency increased, which was attributed to the formation of branched structures and the promoting effect of the amino groups on the titanium dioxide. The inks with decreased viscosity and branched structures displayed excellent cross-linking properties: viscoelastic transition was achieved within 10 seconds and the final moduli were in the range of 36-55 kPa. The cross-linking degree and rate were more than seven times those of unmodified ink. The ranges of elongation and stress were 95%-165% and 1.9-4.3 MPa, respectively, and the amino group content varied from 0% to 0.101%. In general, polyurethane acrylate-based titanium dioxide was shown to be suitable for blue light-curable ink.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2018
·
IF 2.955
Xiangfei Zheng,Jingcheng Liu,Kuan Wang,Ren Liu,Yan Yuan,Xiaoya Liu
Polyimide/amino-modified reduced graphene oxide (PI/AMG) composite matrix were synthesized through the condensation reaction of 4,4'-diaminodiphenyl ether, 3,5-diaminobenzoic acid, diphthalic anhydride, and AMG. Subsequently, the double bonds were incorporated into the matrix through the reaction of glycidyl methacrylate (epoxide group) and the carboxyl group on PI/AMG. UV-cured composite films were then prepared and performance was evaluated. The results revealed that the tensile strength and elongation at break could reach a maximum of 108.7 MPa and 46.4%, which represented increases of 102.8% and 354.9%, respectively, compared with the GPI/AMG 0% film. The water absorption decreased from 0.64% to 0.27%. And their surface resistivity reached 10 6 –10 9 Ω, an increase of approximately eight orders of magnitude.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2016
·
IF 3.389
Xiaolan Feng,Lijun Wang,Xiandong Yao,Huaping Dong,Xiaoxia Wang,Yusen Wang
In this work, we demonstrate that solid-base such as amino-modified silica aerogel (SA-NH 2 ) together with trace water showed excellent catalytic performance in one-pot sequential reaction of acid-catalyzed benzaldehyde dimethyl acetal hydrolysis and base-catalyzed Henry reaction which was usually catalyzed by acid-base bifunctional heterogeneous catalyst. The role of trace water in the reaction was discussed by batch control experiment. This SA-NH 2 /water catalytic system showed high reactant conversions (> 99%) and main product selectivities (up to 99.4%). The trace water induced acid catalysis mechanism and a possible H + /-NH 2 coexistence mechanism were given to explain the synergistic catalytic effect of solid-base and trace water.
研究领域:
化学
·
催化科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 45
·48187
·
IF 2.188
Yan Zhang,Shili He,Jianing Wu,Junjie Ma,Shengdong Shao,Lingjie He,Xiaonan Li,Zhengping Fang,Hongwei Cao,Zhichao Xi
The waste silicon rubber composite insulator (WSiRC) was applied along with ammonium polyphosphate (APP) and pentaerythritol (PER) to improve the flame retardancy of polypropylene (PP) in this study. Considering the compatibility among PP, WSiRC, and flame-retardant additives, WSiRC was treated by acid and N 2 plasma to obtain the plasma-treated WSiRC (PLSiR), which decreases the amount of the inorganic additive and grafts amino groups onto the surface of the silicon rubber. The infrared spectrocopy (IR), scanning electron microscopy (SEM), and thermal gravimetric analysis (TGA) confirm that NH 2 groups have been grafted onto the surface of PLSiR. The TGA data also show that PLSiR had the char improving ability and promote the crosslink of APP, which results in its promotion for the flame retartancy of PP proved by the data of limiting oxygen index (LOI), UL94 rating and cone tests. It is also showed that PLSiR is superior than the WSiRC treated only by acid (ASiR) due to the differences in the structure and polarity. Moreover, the improvement of PLSiR on the flame retardancy of PP is dependent on its amounts. It is indicated that the 1 wt % loading of PLSiR in PP with APP and PER has the highest LOI value of 30.9 and reached UL94 rating V-0. The peak heat release rate (pHRR) and total heat release (THR) values are also decreased by 68.7 and 15%, respectively. SEM and Raman results show the condensed mechanism is ascribed to the PP/APP-PER/PLSiR system because the quality of char affect the flame retardancy of PP. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48187.
研究领域:
高分子材料科学
·
阻燃化学
·
材料表面改性
·
环境功能材料
·
废弃资源再利用
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）