JOURNAL OF SURFACTANTS AND DETERGENTS
·
2010
·Vol. 14
·期 3
·317-324
·
IF 0.795
Cui Zheng-gang,Song Hong-xing,Yu Jun-jie,Jiang Jian-zhong,Wang Feng
Alkali-surfactant-polymer (ASP) flooding has been considered to be one of the useful tertiary oil recovery techniques. However, field tests in China have revealed that serious side effects may occur due to using alkali. Thus alkali-free SP flooding is more favorable in China. Unfortunately, surfactants effective in ASP flooding are usually ineffective in the absence of alkali and new surfactants need to be designed. In this paper N -(3-Oxapropanoxyl)dodecanamide as a pure compound and a mixture of homologues with narrow EO number distribution, synthesized by the reaction of lauroyl chloride with diglycolamine and addition of one ethylene oxide to coconut monoethanolamide respectively, are examined for their adaptability in SP flooding. It is found that, when mixed with betaines, both products can reduce Daqing crude oil/connate water interfacial tension to a magnitude of 10 −3 –10 −4 mNm −1 at 45 °C in a wide surfactant concentration range, 0.01–0.5 wt%, and oil displacement tests using natural cores indicates that a tertiary oil recovery of 18.6 ± 0.4% OOIP can be achieved by SP flooding with the N -(3-Oxapropanoxyl)dodecanamide as the main surfactant without adding any alkaline agent and neutral electrolyte. N -(3-Oxapropanoxyl)dodecanamide, as a nonionic surfactant without a cloud point and producible industrially from renewable materials, is an ideal surfactant for SP flooding in the absence of an alkaline agent.
研究领域:
石油工程
·
化学工程
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 292
·期 10
·2633-2645
·
IF 2.41
Cong Houluo,Zheng Sixun
In this contribution, we reported the synthesis of poly( N -isopropylacrylamide)- block -poly(acrylic acid) (PNIPAAm- b -PAA) copolymer networks via sequential reversible addition-fragmentation chain transfer (RAFT) polymerization. The PNIPAAm- b -PAA block copolymer networks were characterized by means of Fourier transform infrared spectroscopy (FTIR) and small angle X-ray scattering (SAXS). The volume phase transition (VPT) temperatures of the PNIPAAm- b -PAA hydrogels were measured by means of micro-differential scanning calorimetry (micro-DSC). It was found that the block copolymer hydrogels displayed the VPT temperatures lower than the control PNIPAAm hydrogel. Compared to the control PNIPAAm hydrogel, the deswelling and reswelling properties of the block copolymer hydrogels were significantly improved. The improved thermoresponsive properties of the PNIPAAm- b -PAA hydrogels have been interpreted on the basis of the formation of the architecture of the block copolymer networks.
研究领域:
高分子化学
·
生物材料
·
药物递送
·
组织工程
·
智能响应材料
✓ 已验证
DOI
高影响因子
Journal of Biobased Materials and Bioenergy
·
2024
·Vol. 18
·期 6
·1095-1104
·
IF 0.5
Chen Xuewen,Chen Xiaogang,Tang Yichen,Lai Yongxian,Yan Jianna,Jiang Long,Luo Hao,Wang Qingliang,Chen Yuchong
Scalp alopecia areata (SAA) is a common non-scarring hair loss condition, associated with factors such as autoimmune responses, genetics, emotional stress, and endocrine imbalances. Current treatments for SAA included minoxidil, topical steroid creams, biologics, and plant extracts.
Tea tree oil (TTO), a natural plant extract, is known for its antibacterial, anti-inflammatory, and acaricidal properties, and it also provides nourishment for hair. In this research, a natural extract of TTO, was prepared to analyze its antibacterial properties. The hair follicle stem cells
(HFSCs) of patients with primary SAA were analyzed to understand the influences of TTO on migration of HFSCs. TTO was extracted from fresh tea tree leaves using steam distillation. Quantitative analysis of gas chromatography-mass spectrometry (GC/MS) qualitative analysis and its total ion
chromatogram using area normalization method were conducted. Meanwhile, its antibacterial activity was tested against five common pathogens (Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), Staphylococcus albus (S. albus), Pseudomonas
aeruginosa (P. aeruginosa), and Candida albicans (C. albicans)) by measuring the diameter of inhibition zones (DIZ), minimal inhibitory concentration (MIC), and minimum bactericidal concentration (MBC). HFSCs were isolated from patients with SAA and cultured in
vitro, with cell identification performed through cytokeratin 15 (K15) immunofluorescent staining. The HFSCs were then exposed to varying concentrations (0.0, 0.5, 2.0, 5.0, 10.0, and 25.0 mmol/L) of TTO for culture, and cell proliferation activity (CPA) was assessed using the 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazoliumbromide
(MTT) assay, while migration of HFSCs was evaluated using the Transwell chamber assay. Results demonstrated that the extracted TTO had a content of 0.69 g and an extraction rate of 2.32%. 36 components were identified, constituting 98.67% of the total, with 4-terpineol reaching a high concentration
of 48.35%. It exhibited a DIZ of less than 25 mm against all tested pathogens, with MIC values lower than 29 mg/mL and MBC values below 38 mg/mL. Patients with SAA displayed yellow and black dots, broken hair, malnourished and exclamation mark hairs, with few flag hairs observed in skin microscope
examination. Isolated and cultured HFSCs expressed K15 primarily in the cytoplasm and exhibited favorable growth dynamics. Treatment with various concentrations of TTO greatly increased CPA and migrated cell numbers in HFSCs, with the optimal effect observed at 5.0 mmol/L concentration of
TTO. In conclusion, the plant extract TTO possessed significant antibacterial activity and can promote proliferation and migration in vitro of HFSCs, suggesting its potential therapeutic application for SAA.
研究领域:
肿瘤学
·
药理学
·
细胞生物学
✓ 已验证
DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Xiongwei Wang,Yunfeng Yang,Yuanyuan Zhou,Peiyi Wu,Hongyu Chen,Peter Trefonas
In this work, we have systematically studied the miscibility and phase structure of a hydrogen-bonded polymer blend composed of short rigid poly( N -acryloyl piperidine) (PAP) and long flexible poly(acrylic acid) (PAA). Ultrathin PAP/PAA blend films with various compositions were prepared by solution-casting method. It was found that the spin-coated blend films had distinct surface features with many protuberant domains that can be extracted by toluene. Composition analysis of the isolated protrusion domains and matrix domains revealed that PAP/PAA blend is a partially miscible system with PAP-rich protrusion phase (dispersed phase) and PAA-rich matrix phase. The hydrogen-bonding interaction between the amide carbonyl of PAP and hydroxyl of PAA (O=C ⋯ H-O) was found to account for the partial miscibility of these two components. Interestingly, only one positively shifted glass transition temperature (T g ) was detected for this blend. This behavior is very different from other reported partially miscible polymer blends, in which two inward shifted T g s are usually observed. Thermal analysis further disclosed that T g s of PAP-rich dispersed phase and PAA-rich matrix phase are very close to each other, thus merged into one broad T g presented in the blend. The close T g s of these two phases is attributed to the strong hydrogen-bonding interaction between PAP and PAA, which surpasses the compositional difference between them. At high PAP concentrations (above 60 mol percent), the separation of excess PAP in dispersed phase contributed to the appearance of a second T g that corresponds to that of PAP. Such phase behavior was further confirmed in the free-standing films of PAP/PAA blends.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Tianyue Su,Junsheng Wang,Chun Cai
The nickel phosphides have garnered increasing attention as an excellent catalytic site in the fields of electrocatalysis and hydrotreating, but their application in organic synthesis remains infrequent. In this study, ammonium phosphate and nickel chloride were employed as the doping sources for the first time to synthesize the Ni-based ZIF-8 precursor via the host–guest method. Subsequently, the precursor was pyrolyzed to obtain Ni2P nanoparticles (NPs) supported on N, P co-doped carbon. The composite materials exhibit elevated metal loading and effective dispersion due to the synergistic combination of phosphorus and nickel. Specifically, compared with Ni-NC, the optimal Ni2P-NCP-1 exhibits enhanced catalytic activity in the α-alkylation of arylacetonitriles with alcohols using KOH as the base. It shows a wide broad substrate scope at 140 °C for 12 h in n-octane using a hydrogen borrowing strategy. Through characterizations and mechanistic studies, it has been discovered that the introduction of P source not only provides more basic sites on carbon matrix but also leads to the formation of Ni2P NPs, which facilitates the catalytic efficiency by modifying the electronic structure of Ni. Compared with the metallic Ni species, the synergistic effect between Ni2P and acid-basic sites significantly influences the dehydrogenation of alcohols to generate Ni–H species. This study successfully achieves simultaneous phosphating of both the metal and support, and it also demonstrates that the N2P-NCP-1 catalyst has significant potential in the heterogeneous organic transformation field.
研究领域:
有机化学
·
材料科学
·
催化反应
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wen-Long Yu,Shi-Lei Zhao,Guang-Wen Xu,Xin Li,Xiao-Lei Zhang,Yu-Ling Shan,Jun-Wei Ding,Guo-Hui Qin,Jun-Mei Zhang,Xiang Feng,De Chen
The chloroxylenol (PCMX) has shown well virucidal efficacy against COVID-19, but the large-scale utilization of which will undoubtedly pose extra environmental threaten. In the present study, the recycled industrial phenylenediamine residue was used and an integrated strategy of “carbonization-casting-activation” using super low-dose of activator and templates was established to achieve in-situ N/O co-doping and facile synthesis of a kind of hierarchical hyperporous carbons (HHPC). The sample of HHPC-1.25–0.5 obtained with activator and template to residue of 1.25 and 0.5 respectively shows super-high specific surface area of 3602 m 2 /g and volume of 2.81 cm 3 /g and demonstrates remarkable adsorption capacity of 1475 mg/g for PCMX in batch and of 1148 mg/g in dynamic column adsorption test. In addition, the HHPC-1.25–0.5 exhibits excellent reusability and tolerance for PCMX adsorption under various ionic backgrounds and real water matrix conditions. The combined physio-chemistry characterization, kinetic study and DFT calculation reveal that the enhanced high performances originate from the hierarchical pore structure and strong electrostatic interaction between PCMX and surface rich pyridinic-N and carbonyl groups.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Jia-Wei Li,Miao Chen,Jie-Mei Zhou,Cai-Yuan Pan,Wen-Jian Zhang,Chun-Yan Hong
Polymerization-induced self-assembly (PISA) is an efficient and robust strategy to fabricate polymeric nano-objects. PISA enables us to prepare polymeric nano-objects in situ during the course of polymerization in concentrated solution (up to 50% w/w), making industrial production of polymeric assemblies in large-scale possible. In this work, reversible addition-fragmentation chain transfer (RAFT) dispersion copolymerization of styrene (St) and N-methacryloxysuccinimide (NMAS) was conducted with poly(2-hydroxyethyl acrylate) (PHEA) as a macro-chain transfer agent (macro-CTA) in methanol. Compared with the PHEA-mediated alcoholic dispersion polymerization of St, RAFT dispersion copolymerization of St and NMAS promoted morphology transition of nano-objects to form higher order morphologies (such as worms and vesicles). Moreover, the introduction of NMAS units into the solvophobic blocks provided functional handles for post-PISA modification of the resultant nano-objects via the active ester-amine reaction. The reaction of 1,6-hexanediamine with NMAS units in P(St- co -NMAS) blocks was conducted to afford cross-linked nano-objects with robust structural stability.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2021
·
IF 8.271
Juan Xiao,Junwei Chen,Zuqiao Ou,Junhang Lai,Tongwen Yu,Yi Wang
Herein, the application of a N-doped graphitic-carbon-coated iron nitride composite dispersed in a N-doped carbon framework (Fe 3 N@NG/NC) is investigated as a heterogeneous electro-Fenton (HE-EF) catalyst for the efficient removal of organics. The simultaneous carbonization and ammonia etching of iron-based metal organic framework (Fe-MOF) materials yielded well-dispersed N-doped carbon-coated Fe 3 N nanoparticles with a diameter of ~70 nm. The Fe 3 N and pyridinic N endowed the composite with high HE-EF activity for decomposing the electrogenerated H 2 O 2 to • OH. The Fe 3 N@NG/NC exhibited outstanding HE-EF performance in removing various organic pollutants with low iron leaching. A removal rate of 97–100% could be obtained for rhodamine B (RhB), dimethyl phthalate , methylene blue , and orange II in 120 min at a pH of 5.0. When the solution pH was set to 3.0, 5.0, 7.0, and 9.0, the removal rate of RhB reached 100%, 96%, 92%, and 81%, respectively, in 60 min at an optimum voltage of 0.0 V ( vs. reversible hydrogen electrode (RHE)). Moreover, the concentration of leached iron was expected to be below 0.03 mg/L in a wide pH range of 3.0–9.0. In addition, the RhB removal efficiency remained as high as 90% after six cycles in the reusability experiments. This work highlights the MOF-derived Fe 3 N composite as an efficient HE-EF catalyst and the corresponding catalytic mechanism, which facilitates its application in wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 35
·13967-13978
·
IF 3.069
Qiang Ning,Huaike Zhang,Yurong He,Zhiqiang Chen,Suyao Liu,Jie Ren
Small Pt particles (about 1.2 nm) were highly dispersed on ZSM-22 zeolites via a strong electrostatic adsorption (SEA) method and exhibited a promotion effect on the catalytic performance in n-dodecane isomerization in comparison with the conventional catalyst. Several promoters (Ce, La, and Re) were introduced to further improve the aggregation resistance of the small Pt particles. A series of characterization including H2-TPR, XPS and STEM as well as DFT calculations provided solid evidence that the strong interaction between Pt and promoter species not only effectively hinders the Pt aggregation but also alters the electronic state of the Pt sites. Moreover, Ce and La promoters also lead to a slightly improved amount of B acid sites determined by Py-FTIR. Thus, improved activity and selectivity were achieved on a Ce-modified catalyst due to the better balanced bifunctionality between the slightly increased acidity of zeolites and electron-deficiency of Pt. The electron-rich Pt sites are responsible for the significant increase of CH4 selectivity and the decrease of total isomer selectivity in n-dodecane isomerization. In addition, a high-temperature reduction test revealed the higher isomerization activity and selectivity (about 10% higher than the unmodified catalyst) of the Ce-modified catalyst owing to the strong bond of Pt–O–Ce, further confirming the positive effect of the Ce promoter on the sintering resistance of small Pt particles.
研究领域:
催化化学
·
材料科学
·
计算化学
✓ 已验证
DOI
高影响因子
Applied Catalysis O: Open
·
2024
·
IF 0
Yongsi Jiao,Cunjun Li,Yanqi Xu,Limei He,Linjiang Wang
Photodegradation of indigo carmine (IC) in wastewater has received much attention in recent decades. However, the current photocatalysts used for IC photodegradation suffer from an unsatisfactory efficiency due to low yield of reactive species. Herein, a P-modified biochar/g-C 3 N 4 (P-BC/CN) photocatalyst was fabricated by mechanochemical method using P-modified biochar and g-C 3 N 4 as precursors. It is discovered that P N bonds were constructed between P-modified biochar and g-C 3 N 4 , and these bonds served as the active sites to promote the generation of •O 2 − during the photodegradation process. The biochar component in P-BC/CN composite is conducive to transfer the photogenerated carriers, thereby avoiding their recombination. The photodegradation experiment showed that the P-BC/CN composite exhibits an impressive photodegradation performance towards IC ( C 0 = 50 mg/L) with a photodegradation rate of 95.3% in 120 min. This work provides a green and efficient method to design biochar-based photocatalyst with P N active sites for advanced wastewater purification.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 6
·4608-4618
·
IF 1.556
Cui Qinmin,Zhu Shudi,Yan Yingjie,Ye Quanlin,Ziener Ulrich,Cao Zhihai
In the present study, superparamagnetic Fe3O4/poly(N-isopropyl acrylamide) nanocomposites were synthesized by one-step inverse miniemulsion copolymerization of N-isopropyl acrylamide and N,N'-methylene diacrylamide. The loading of Fe3O4 nanoparticles
in the nanocomposites was 27 wt%, and the saturation moment of the nanocomposites was 12.4 emu · g−1. Fe3O4 nanoparticles were prepared through a coprecipitation method. The amount of stabilizer (poly(acrylic acid)) significantly influenced the
size and size distribution of the Fe3O4 nanoparticles, and, therefore, their magnetic properties. Superparamagnetism of the Fe3O4 nanoparticles was preserved in the nanocomposites. The effects of synthetic parameters on the particle properties, namely
surfactant loading, concentration of ferrofluid, type of lipophobe and initiator, and amount of cross-linker were investigated. Nanocomposites of Fe3O4/poly(N-isopropyl acrylamide) displayed a guava-like morphology, which they could retain after being redispersed
in polar solvents.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2020
·Vol. 13
·期 16
·4151-4158
·
IF 7.962
Huai Liu,Ning Ding,Junnan Wei,Xing Tang,Xianhai Zeng,Yong Sun,Tingzhou Lei,Huayu Fang,Tianyuan Li,Lu Lin
Graphical No base needed : N-doped carbon-supported CoCu bimetallic catalyst with enhanced O 2 activation ability and basicity is demonstrated as an effective catalyst for the oxidative esterification of 5-hydroxymethylfurfural. The introduction of Cu significantly enhances the catalytic activity, resulting in a high furan-2,5-dimethylcarboxylate yield and an impressive formation rate, paving the way for the efficient and green synthesis of sustainable bio-based polymer monomers. The direct fabrication of furan-2,5-dimethylcarboxylate (FDMC), a promising renewable monomer, from biomass-derived 5-hydroxymethylfurfural (HMF) is a cutting-edge process. In this contribution, an elaborately designed N-doped carbon-supported CoCu bimetallic catalyst (Co x Cu y -NC; x / y= 9:1, 7:3, 4:6, which represents the designed molar ratio of Co and Cu in the catalyst), which could offer a desirable FDMC yield of 95 % under mild and base-free conditions (Co 7 Cu 3 -NC, 2 bar O 2 , 80 °C, 4 h) is described for the oxidative esterification of HMF. Notably, an FDMC formation rate of 6.1 mol FDMC mol Co −1 h −1 was achieved over Co 7 Cu 3 -NC, which represents the highest catalytic efficiency so far among Co-based catalytic systems. It has been demonstrated that Cu-doping in Co 7 Cu 3 -NC catalyst brings about more active sites (Co-N x species) with stronger molecular oxygen activation ability. The increase of surface N content of Co 7 Cu 3 -NC also improves basicity of the catalyst, which favors the hydrogen abstraction process during the HMF oxidative esterification reaction. These findings may pave an efficient and green way for the synthesis of sustainable bio-based polymer monomers.
研究领域:
催化化学
·
生物质转化
·
绿色化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）