COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Meng Cun,Jincheng Mao,HaiLin Sun,Guo Wei,Feng Tang,Wenlong Zhang,Jizhen Tian,Xiaojiang Yang,Chong Lin,ZiGao Huang
In recent years, cationic surfactants have received extensive attention in cleaning fracturing fluid thickeners due to various unique properties. At the same time, the development of temperature-resistant and salt-resistant clean fracturing fluid is the key to deep well oil and gas resource development. In this study, the rigid-soft combined strategy is adopted for molecular structure designs. N,N -dimethylcyclohexylamine and epichlorohydrin are used as the initial reactants; after the ring-opening reaction occurs, they are quaternized with erucamide propyl dimethyl ammonium to synthesize a novel double-cation viscoelastic surfactant , SY–JS. With double-cationic charges on the head group, water molecules are selectively adsorbed around the cation lattice to increase the hydration layer, and thus, salt tolerance is improved. Cyclohexane with a rigid structure improves temperature resistance. The ultra-long unsaturated hydrophobic tail imparts excellent heat tolerance and dissolubility to the designed viscoelastic surfactant. The clean fracturing fluid prepared by 3 wt% SY–JS with 130,000 ppm NaCl or KCl performs well under a shear rate of 170 s −1 at 140 °C, and the apparent viscosity remains above 30 mPa s −1 after 120 min.. Additionally, the results show that single-tail surfactants exhibit excellent performance at approximately 140 °C. Afterward, the brine produced from Rumaila and Jiyuan oil fields is used to prepare brine-based clean fracturing fluids, and evaluations, including proppant suspension, gel breaking, and permeability damage, were conducted. The results show that the brine-based clean fracturing fluid completely meets the requirements of hydraulic fracturing industrial application.
研究领域:
石油工程
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化学工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 16
·8887-8897
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IF 14.511
Donglin Han,Peng Zhong,Xiaorong Zhang,Lulu Jiang
Electrolytes with excellent chemical stability and high proton conductivity are key materials for protonic ceramic fuel cells and electrolyzers. Doping aliovalent cations to increase the number of oxygen vacancies is a common method to increase conductivity. However, determining proper sites for efficient doping is a matter of general concern because in many cases, there are several cation sites in complex oxides. In this work, we used EXAFS analysis to probe the changes in the local structure of proton-conducting pyrochlore oxides, La2(Nb0.4Y0.6)2O7−δ (LNY60) and La2(Nb0.35Y0.65)2O7−δ (LNY65), upon hydration and found that the coordination number of the oxygen sites in the vicinity of La and Y increased after hydration, indicating that these oxygen sites were active for the hydration reaction to introduce protons. Thereafter, the trivalent La sites were doped with divalent Ca, Sr and Ba cations to introduce more oxygen vacancies into the adjacent oxygen sites to facilitate the hydration reaction. As expected, the proton conductivity increased with increasing content of Ca, Sr and Ba. The conductivities of 2.54 at% Ca-doped LNY60 and 0.98 at% Sr-doped LNY65 were both 1.16 × 10−3 S cm−1 at 700 °C, nearly four times higher than those of the pristine oxides. These results indicate that assisted by EXAFS analysis, proper dopant sites can be determined precisely to further elevate proton conductivity in oxides.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Tianxing Gong,Tingyu Li,Lisha Meng,Yadong Chen,Tao Wu,Jingqiu Zhou,Guoxiu Lu,Zhiguo Wang
Native bone is piezoelectric in nature and generates abundant surface charges under mechanical compression, which regulate osteoblast proliferation, differentiation, adhesion, and so on. Poly (vinylidene fluoride) (PVDF) is becoming one of the most popular piezoelectric polymers because of its easy processability and good biocompatibility. Unfortunately, because only the β and γ crystal phases of PVDF have piezoelectricity, post-treatments, for example, polarizing at high temperature, are required to enhance the piezoelectricity of PVDF scaffolds after fabrication. In this study, we reported a phase-separation-hydration method to fabricate a calcium phosphate silicate (CPS)-doped PVDF scaffold. Our method fabricated a better piezoelectric scaffold than native bone without further processing (∼ 3 pC/N vs. 0.7 pC/N). In addition, the scaffold was mechanically compatible (∼ 7 MPa) with the cancellous bone with sufficient porosity (∼ 45%) to facilitate osteoblast infiltration and bone ingrowth. The in vitro biocompatibility analyses proved that the prepared CPS-PVDF scaffold was biocompatible with osteoblast cells and encouraged osteoblast redifferentiation. In conclusion, our results suggest that this CPS-PVDF scaffold is a promising candidate for bone tissue engineering applications.
研究领域:
材料科学
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生物材料
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组织工程
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生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Hengxin Fang,Zhixu Tang,Xinjuan Liu,Yongli Huang,Chang Q. Sun
It has been a long pursuit to discriminate the ionic roles of mono- and di-valent salt solutions in modulating the hydrogen bonding network and solution properties. We attended this issue by examining the effect of concentrated YX 2 (Y Mg, Ca, Sr; X Cl, Br) solvation on O:H O bonds transition from the mode of ordinary water to hydration in terms of the number fraction f YX2 ( C ) and the segmental O:H O bond phonon stiffness shift Δω(C) with C being the solute concentration. The invariant df Y ( C ) / dC at C ≤ <0.05 suggests that the small Y 2+ forms a constantly-sized hydration droplet with weak responding to interference of other ions because its hydrating H 2 O dipoles screen mostly its electric field. However, the number inadequacy of the highly-ordered hydrating H 2 O dipoles partially screens the large X − . The X − ↔ X − electrostatic repulsion weakens its electric field. The concentration-trend consistency of the f YX2 ( C ), the solution conductivity σ YX2 ( C ), and surface stress (contact angle) θ YX2 ( C ) for YX 2 solutions clarifies their common origin of ionic polarization. However, the Jones–Dale notion disobedience of the viscosity η YX2 ( C ) suggests the dominance of the inter-ion repulsion.
研究领域:
物理化学
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材料科学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Di Li,Yanyan Gong,Minchen Du,Chao Bu,Cheng Chen,Somboon Chaemcheun,Jia Hu,Yongxing Zhang,Ye Yuan,Francis Verpoort
α-Hydroxy ketones are a series of biologically active fragments in nature as well as important synthons for organic chemistry. Herein, an AgOAc/1-ethyl-3-methylimidazolium acetate ionic liquid system was developed for the CO2-promoted hydration of propargylic alcohols and H2O to produce α-hydroxy ketones. Diverse desired products could be obtained in satisfactory yields under 1 bar of CO2 pressure with the catalysis of only a trace amount of silver (0.005–0.25 mol %), which is the lowest level ever reported for the metal-catalyzed systems. In particular, this system had robust recyclability, and it could be reused effectively at least 5 times. Furthermore, an unprecedented turnover number (TON) of 9200 was achieved, which is considered to be the highest TON ever reached for this hydration.
研究领域:
有机化学
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催化
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绿色化学
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产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 9
·1554
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IF 5.3
Min Zheng,Xiangzhou Li,Youyi Xun,Jianhua Wang,Dulin Yin
It is presented that the activated carbon was carboxylated with hydrogen peroxide and then acylated with 2-methylimidazole to prepare the porous carbon support with a surface imidazolated modification. Through the adsorption of phosphotungstic acid on the fundamental site of an imidazolyl group and then adjusting the acid strength with the ammonia molecule, a catalytic carbon material immobilized with ammonium phosphotungstate (AC-COIMO-NH4PW) was obtained, which was used to catalyze a one-pot reaction of convenient α-pinene and hydrogen peroxide to sobrerol. The bifunctional active site originated from the dual property of ammonium phosphotungstate, as the oxidant and acid presenting a cooperatively catalytic performance, which effectively catalyzes the tandem epoxidation–isomerization–hydration of α-pinene to sobrerol, in which the solvent effect of catalysis simultaneously exists. The sobrerol selectivity was significantly improved after the acid strength weakening by ammonia. Monomolecular chemical bonding and anchoring of ammonium phosphotungstate at the basic site prevented the loss of the active catalytic species, and the recovered catalyst showed excellent catalytic stability in reuse. Using acetonitrile as the solvent at 40 °C for 4 h, the conversion of α-pinene could reach 90.6%, and the selectivity of sobrerol was 40.5%. The results of five cycles show that the catalyst presents excellent stability due to the tight immobilization of ammonium phosphotungstate bonding on the imidazolized activated carbon, based on which a catalytic-cycle mechanism is proposed for the tandem reaction.Keywords:sobrerol;α-pinene;catalytic synthesis;ammonium phosphotungstate;activated carbon
研究领域:
化学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
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2023
·Vol. 54
·期 2
·712-733
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IF 3
Zhang Xi,Na Hao,Liu Pengyao,Wang Yajun,Li Junguo,Meng Qian,Li Guopeng
Regulating the phase transformation of γ → β in dicalcium silicate (C 2 S) can effectively improve the hydration activity and recycling rate of AOD slag; however, the evolution law for γ → β in C 2 S has not been extensively investigated. In this study, a novel “two-step” γ → α ′ L → β phase transformation method in C 2 S was designed based on the study of the pure C 2 S phase at a nonequilibrium state in the low- and middle-temperature ranges. The “two-step” method can be used to realize the transformation from needle-like nanostructured γ -C 2 S grains to lamellar-structured β -C 2 S grains, exhibiting the trend of interlaminar peeling accompanied by expansion of the particle volume and leading to the appearance of macroscopic lamellar cracking in β -C 2 S particles. In addition, the β -C 2 S mass fraction in AOD slag treated by water cooling at 680 °C reaches a maximum value of 47.5 wt pct, while the treated AOD slag presents abundant holes and defects, which can effectively enlarge the hydration contact area.
研究领域:
材料科学
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无机化学
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产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Jiqun Li,Yan Zhang,Shiyu Song,Jianlin Yang
Transparent superhydrophilic coatings exhibiting underwater superoleophobic behavior have garnered significant interest for their promising functionality in fogging resistance and oil repellent applications. However, the development of such coatings with effective anticrude-oil-fouling properties presents a formidable challenge, as conventional approaches to mitigate high-viscosity crude oil adhesion often compromise optical transparency. Herein, we report a bioinspired “double-defense” strategy that integrates a polydopamine/polyethylenimine-dextran (PDA/PEI-D) hydrogel layer with a biomimetic mineralized magnesium phosphate (MP) layer to construct a hierarchical “sesame cake-like” superhydrophilic coating. This unique architecture demonstrates exceptional crude-oil-repellency and long-term antifogging performance. With the “double-defense” design strategy, the synergistic effect of the second defense hydrogel layer (cake layer) and the first defense MP layer (sesame layer) enhances the hydration capacity of the PDA/PEI-D/MP coating, ensuring superior crude-oil-repellent and antifogging properties. Moreover, the uniformly distributed discrete MP nanoparticles on the PDA/PEI-D/MP coating surface minimize light scattering while maintaining the coating’s optical transparency (>90% transmittance). The “sesame cake-like” PDA/PEI-D/MP coating maintains high transparency and crude-oil-repellent and fogging resistance even after a series of durability tests and can be widely used in underwater optics, microfluidic systems, and oily wastewater treatment.
研究领域:
材料科学
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纳米技术
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表面工程
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高分子科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2024
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IF 7.1
Xiangshan Hou,Jingwei Li,Jianwei Xu,Xin Xiao,Jianyong Wang,Yanhui Liu,Mona Ossman,Fawei Lin,Xujiang Wang,Yuzhong Li,Wenlong Wang
Rapid repair mortar (RRM) is widely used to repair infrastructures, which must achieve high early strength and long-term service. This study investigated the influence of hot/wet harsh environmental conditions on RRM prepared using solid-waste-based sulfoaluminate cement (WSAC). Orthogonal experiments were conducted to obtain the optimized WSAC-based RRM. Then, the impact of simulated harsh conditions (cross-combination of 20/60 °C and 10/40/90%RH humidity) on RRM and synthetic ettringite was studied. High temperature and low humidity restrained the volume deformation and promoted the growth of the later-age compressive strength of the RRM, but reduced the flexural strength. In this case, ettringite lost some water molecules in the Ca–H2O groups and transformed into amorphous meta-ettringite, which retained its needle-rod morphology. A small amount of ettringite decomposed into gypsum, AH3, and Ca(OH)2 under high-humidity conditions, which caused a slight expansion and reduced the compressive strength of the RRM. Fortunately, most ettringite was well protected by the dense RRM matrix, and harsh temperature and humidity conditions could only slowly promote the transformation of ettringite in RRM over a long period. Therefore, short-term rain or hot weather has little effect on the mechanical properties of WSAC-based RRM. This study provides a theoretical basis and data support for the promotion of industrialization of WSAC-based RRM, which is in line with the concept of green and sustainable development.
研究领域:
土木工程
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材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2014
·
IF 2.302
Xuezhu Wang,Yongyong Wang,Jing Zhang,Xiaoli Zhao,Ye Liu
A series of ionic Au(I)-complexes ligated by the phosphine-functionalized ionic liquids were synthesized and characterized, which are composed of the Au(I)-complex cation and the counteranion of OTf − , AuCl 4 − , or PF 6 − , respectively. The single crystal X-ray diffraction analyses show that the Au(I)-centered vector in 1A , 1B , 2A , 3A , and 4A all possess the slightly twisted linear geometry, and in each individual the Au(I)-center is coordinated by one chlorine and one imidazolium-based phosphine. The aggregation of 1B in acetone can lead to the formation of the trinuclear Au(I)-complex of 1C due to the aurophilic Au(I)–Au(I) interaction, the electrostatic attraction, and the steric preference. When these ionic Au-complexes were employed as precatalysts for hydration of phenylacetylene in aqueous-methanol media, the reaction proceeded selectively according to Markovnikov's rule with moderate to high yields of acetophenone . The highest activities were achieved over 2A with hydrophobic PF 6 − as the counteranion and the trinuclear 1C under mild conditions (75 °C, 2 h), in conjunction with the additive of proton acid H 2 SO 4 . The ion-pair effect on the catalytic performance of the corresponding Au(I)-complexes, coming from the phosphine-ligated cations and the counteranions, were investigated.
研究领域:
化学
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催化材料科学
✓ 已验证
DOI
高影响因子
Frontiers in Pharmacology
·
2019
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IF 3.845
Li Hong,Yan Liping,Tang Edith K.Y.,Zhang Zhen,Chen Wei,Liu Guohao,Mo Jingxin
Curcumin (CCM) has many potential uses in anticancer chemotherapy, but its low water solubility poses a major problem, preventing its translation into clinical use. TPGS is a water-soluble derivative of vitamin E that acts as a surfactant with the ability to form micellar nanoparticles in water. More importantly, TPGS acts as a potent antioxidant that can neutralize intracellular reactive oxygen species (ROS). In this study, we solubilized CCM with TPGS using thin-film rehydration to prepare aqueous formulations containing CCM at clinically relevant concentrations. We found that the minimal TPGS:CCM ratio for producing nanoparticles was 5:1 (w/w): at or above this ratio, stable nanoparticles formed with an average particle diameter of 12 nm. CCM was released from TPGS/CCM micelles in simulated colonic and gastric fluids. These TPGS/CCM nanoparticles were shown to decrease intracellular ROS levels and apoptosis and inhibited migration of HT-29 human colon cancer cells more potently than free CCM. Pharmacokinetic analysis showed TPGS/CCM to be more bioavailable than free CCM after oral administration to rats. Our results suggest that TPGS/CCM may increase therapeutic efficacy of CCM against colon cancer and merits further investigation in a clinical setting.
研究领域:
药学
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纳米技术
·
癌症研究
·
药理学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Mengyao Liu,Yingying Yao,Bingyu Tian,Kun Cui,Ping Wen,Rui Dong,Mingjin Fan
Efficient lubrication at low concentration has always been the pursuit of mechanical equipment in engineering applications, and breakthroughs for high performance are urgently needed, as well as the consideration of cost and sustainability. Therefore, water-based lubricants have become a crucial and potential lubricating system. Herein, a novel ionic liquid (IL) water-based lubrication system was constructed, achieving superior lubricity and long-term stability, whose optimal anti-friction performance and corrosion resistance are reduced by more than 80 %. More importantly, its versatility (anti-corrosion, strong adsorption, anti-wear and load-bearing) is also essential. Of course, these improved performances are inseparable from the multiple interactions (hydrogen bond, competitive adsorption, electrostatic interaction, tribo-chemistry) between ILs and engineering metal surfaces. More interestingly, the exploration of interaction mechanism inspires more in-depth insights for self-assembly behavior for IL aqueous system at the metal interface. From in-depth insights on lubricating mechanism, the hydration shell induced by polar groups and interfacial tribochemical reaction are predominant in competitive adsorption, which can be inferred from the molecular dynamics simulation data. As far as the interaction force is concerned, the struggle and balance among adsorption energy, hydrogen bond and electrostatic interaction force reveal the synergistic lubrication mechanism of multiple interaction force coupling. Besides, the structure–activity relationship between system composition and performance provides theoretical guidance for its practical engineering application, which also can be expanded as an important theoretical basis and experimental references for aqueous lubrication.
研究领域:
材料科学
·
机械工程
·
表面化学
✓ 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）