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.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Minzhe Chu,Yingying Zhai,Ningzhao Shang,Peijing Guo,Chun Wang,Yongjun Gao
The monomer of sustainable chitin, N-acetylglucosamine (NAG), is fabricated into a kind of N-doped carbon material (NC-HAP-700), with the template of hydroxyapatite (HAP). NC-HAP-700 exhibits excellent electrochemical capacitance of 346 F/g at the current density of 0.5 A/g and capacitance retention of 92% after 5000 times of charge-discharge cycles, which is superior to most reported functional carbon materials. Experiments and characterizations suggest that HAP is an ideal template to improve the surface area, create microporous structure and carbonyl groups for final carbon product. High percentage of pyridinic N, pyrrolic N and oxygen-containing groups are main contributions to the pseudo capacitance of NC-HAP-700. More important, the supercapacitors exhibit practical application in which solar energy can be stored and release to light up red LED.
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CARBON
·
2018
·
IF 7.082
Xiujun Qi,Kangsheng Huang,Xuan Wu,Wei Zhao,Hong Wang,Quanchao Zhuang,Zhicheng Ju
Potassium-ion batteries (PIBs) are an emerging energy storage technology for low cost and large scale applications. However, due to the larger K ions it suffers insufficient cycle life and poor rate capability. In this paper, these problems are surmounted by using N-doped porous carbon (NPC) anodes. Excellent electrochemical performance was demonstrated with a high reversible capacity of 296.8 mA h g −1 after 100 cycles at a current density of 50 mA g −1 . The superior performance is mainly ascribed to well-defined pore structure and high nitrogen content. The unique porous structure can effectively alleviate the volume expansion induced by the insertion of large K ions. Moreover, nitrogen doping can generate different types of defects and vacancies, thereby providing more electroactive sites. Given the abundance and universal distribution of potassium in the Earth's crust, the encouraging results make NPC a promising candidate for KIBs anodes.
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APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Yingkang Chen,Hang Zhang,Hongmei Li,Junhua Hu,Yan Long,Min Liu
The N-alkylation of amines with tetrahydrofuran (THF) to synthesize pyrrolidine compounds is an economic and environmental benign route. However, current catalytic system often suffered from harsh reaction condition and hazardous reagents. In this work, we developed an alumina nanosheet catalyst with a large amount of medium acid sites for synthesis of N-arylpyrrolidines. Nearly 100% target product yield could be obtained at 190 °C, and this catalyst could be reused at least 5 times without obvious deactivation. NH 3 -temperature programmed desorption (TPD) and pyridine-infrared (py-IR) revealed that the catalytic performance is positively correlated with the content of medium acid sites. In-situ IR spectrum proved that the reaction follows the carbocation mechanism. This work affords a competitive system for green sustainable chemistry.
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iScience
·
2022
·
IF 6.107
Kefeng Wang,Qingzhen Yu,Wenli Mao,Yuxin Zheng,Jing Xu,Yukun Wang
Vinylboron compounds are important compounds in organic chemistry and biology. In this communication, we developed a copper(I)-catalyzed, highly regio- and stereoselective radical trans -hydroboration of ynamides with N -heterocyclic carbene (NHC)-ligated borane is reported, which leads to a series of trans -boryl enmides that can be conveniently transformed into various multi-substituted enamides. Further investigation showcased that our method is robust and scalable. The mechanism of this unique reaction is studied and discussed.
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PubMed
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 23
·2300381
·
IF 4.6
Zhengwei Hu,Juxuan Xie,Jiangkai Yu,Yi Zhang,Houji Cai,Yuanqing Bai,Kai Zhang,Chunchen Liu,Fei Huang,Yong Cao
The optoelectronic properties and photovoltaic performance of nonfullerene electron acceptors (NFEAs) in organic solar cells (OSCs) are greatly influenced by the rational structure regulation of the central core unit. This study introduces a novel type of six-membered fused electron-donating core containing B─N covalent bonds to construct acceptor–donor–acceptor (A–D–A)-type NFEAs. By modulating the branching alkyl chains on the nitrogen atom, two NFEAs, BN910 and BN1014, are synthesized and characterized. Both molecules exhibit strong near-infrared absorption, narrow bandgaps (≈1.45 eV), appropriate energy levels, and tunable molecular packing behaviors, positioning them as promising candidates for efficient NFEAs in OSCs. The investigation reveals that BN1014, with longer and C2-branched alkyl chains, demonstrates superior intermolecular packing and morphology within active layers, leading to enhanced exciton dissociation, improved charge transfer, and reduced charge recombination in OSCs. As a result, a power conversion efficiency (PCE) of 10.02% is achieved for D18:BN1014-based binary OSCs. Notably, BN1014 can be utilized as the third component in the D18:DT-Y6 binary system to fabricate the ternary OSCs, and a PCE of 17.65% is achieved, outperforming 17.05% of D18:DT-Y6-based binary OSCs. These findings highlight the potential of heteroarenes featuring B─N covalent bonds for constructing high-efficiency NFEAs in OSCs.
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iScience
·
2023
·Vol. 26
·期 4
·106461-106461
·
IF 5.8
Shuaibo Zhai,Jiaqi Gong,Yifei Feng,Zhongbao Que,Weiwei Mao,Xuemin He,Yannan Xie,Xing’ao Li,Liang Chu
Memristors are promising information storage devices for commercial applications because of their long endurance and low power consumption. Particularly, perovskite memristors have revealed excellent resistive switching (RS) properties owing to the fast ion migration and solution fabrication process. Here, an n-i-p type double perovskite memristor with "ITO/SnO 2 /Cs 2 AgBiBr 6 /NiO x /Ag" architecture was developed and demonstrated to reveal three resistance states because of the p-n junction electric field coupled with ion migration. The devices exhibited reliable filamentary with an on/off ratio exceeding 50. The RS characteristics remained unchanged after 1000 s read and 300 switching cycles. The synaptic functions were examined through long-term depression and potentiation measurements. Significantly, the device still worked after one year to reveal long-term stability because of the all-inorganic layers. This work indicates a novel idea for designing a multistate memristor by utilizing the p-n junction unidirectional conductivity during the forward and reverse scanning.
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PubMed
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 8
·4088-4101
·
IF 11.9
Tian Yu,Suiting Ning,Tingting Zhang,Xiangbin Chen,Qian Liu,Ning Qi,Zhiquan Chen,Xianli Su,Xinfeng Tang
As one kind of superionic conductor, CuAgSe is a promising thermoelectric material due to its extremely low thermal conductivity and high electron mobility. In this study, the electrical and thermal properties of CuAgSe were collaboratively optimized by changing the chemical composition. Seebeck coefficient measurements reveal that stoichiometric and CuAg-deficient CuAgSe materials show n–p transition with the increase of temperature. In contrast, the Se-deficient CuAgSe still shows n-type conduction in the α-phase at high temperatures. Positron annihilation measurements indicate that there are large amounts of cation vacancies such as Ag and Cu vacancies in the stoichiometric and CuAg-deficient samples, which provide a high concentration of hole carriers and are responsible for the n–p transition at high temperatures. The number of vacancies decreases gradually with increasing CuAg content, and in the Se-deficient CuAgSe, VAg–Se divacancies are formed, which further results in a sufficient decrease of hole carriers. As a result, the Se-deficient samples still show n-type conduction in the α phase. Our results indicate that vacancy defects are the key factors that determine the conduction type in CuAgSe, which can be tuned by the chemical composition. In addition, superb thermoelectric performance was achieved in both p-type and n-type CuAgSe, with maximum ZT of 0.96 at 573 K in (CuAg)0.96Se (p-type) and 0.55 at 630 K in (CuAg)1.02Se and (CuAg)1.04Se (n-type).
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CHEMPHYSCHEM
·
2013
·Vol. 14
·期 13
·2954-2960
·
IF 3.349
Chunyang He,Dongqing Wu,Fan Zhang,Minzhao Xue,Xiaodong Zhuang,Feng Qiu,Xinliang Feng
Graphical Ruling chains: A set of n -type conjugated molecules containing a tetraazaanthracene core and different alkyl-chain arms is presented. In binary solvent mixtures, self-assembly into 2D sheet-like nanostructures takes place (see picture). By using different alkyl chains, morphology can be sensibly modified. The weak interactions arising from the heteroatoms in the conjugated backbones play a key role in the formation and stabilization of the layered structures. On the basis of our previous communication concerning a new family of thiophene-armed tetraazaanthracene molecules, we present a further intensive investigation on this class of compounds substituted with different alkyl chains and their self-assembled two-dimensional (2D) nanostructures. These tetraazaanthracene molecules with different alkyl chains were prepared in good yields using the synthetic strategy we developed. In addition to the expected typical n -type character, one compound exhibited aggregation behavior upon electrochemical reduction. Moreover, all molecules in the neutral state showed a strong tendency to aggregate in a binary solvent, as confirmed by optical spectral measurements. To investigate such self-assembly behavior, a phase-transfer method with a dichloromethane/methanol (2:3) binary solvent system was used to prepare the nanostructures. By means of atomic force microscopy, transmission electron microscopy, and X-ray diffraction, we found that the morphology of assembled 2D sheet-like structures could be adjusted by varying the alkyl chain. The weak interactions arising from the heteroatoms (N and S) in the conjugated backbones play a key role in the formation and stabilization of layered structures.
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RSC Advances
·
2015
·Vol. 5
·期 20
·15469-15478
·
IF 3.84
Tingting Wang,Hui Meng,Xiang Yu,Yizhu Liu,Hongbin Chen,Yi Zhu,Jinpeng Tang,Yexiang Tong,Yuanming Zhang
A BiOI/SnS2 p–n junction is prepared by depositing BiOI particles on flowerlike SnS2 flakes. The heterojunction formed between p-type BiOI and n-type SnS2 brings greatly improved photocatalytic activity compared with pure SnS2 or BiOI in the degradation of Rhodamine B dye under visible light and sunlight irradiation. The improved photocatalytic performance is explained by the synergetic effects of the formation of a p–n junction between BiOI and SnS2. The migration of photogenerated carriers can be promoted by the electric field established at the heterojunction interfaces, leading to effective separation of the photogenerated electron–hole pairs and reduced electron–hole recombination. The BiOI/SnS2 heterojunction will find promising applications in photocatalysis and solar energy conversion.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Nadia Batool,Babar Shahzad,Waseem Iqbal,Xiao-Feng Han,Wen-Tao Wang,Jin Yan,Ruhua Shi,Jing-Hua Tian,Ruizhi Yang
Pt–TM (TM = Fe, Co, Ni, Cu, etc.) alloy catalysts, other than pure Pt, have been introduced as active catalysts for ORR. However, the synthesis of highly durable Pt alloy catalysts is still an enormous challenge. Herein we utilized pyrolyzed-MOF as a carbon support to fabricate PtNi nanoparticles with an average diameter of 3.1 nm. The as-synthesized Pt1Ni1/NC catalyst showed a higher ORR activity than commercial Pt/C (20 wt % Pt on carbon) in both alkaline and acidic solutions. Pt1Ni1/NC delivered a high mass activity of 2.16 A mg Pt–1, superior to Pt/C (0.105 A mg Pt–1) in 0.1 M KOH, and showed a high mass activity of 1.09 A mg Pt–1, superior to Pt/C (0.101 A mg Pt–1) in 0.1 M HClO4. Furthermore, Pt1Ni1/NC displayed excellent durability in both alkaline and acidic solutions, with minor decay in half-wave potential after 8000 cyclic voltammetry cycles. Zinc–air batteries (ZABs) assembled with Pt1Ni1/NC displayed a high specific capacity of 882 mAh gzn–1 and an energy density of 1102 Wh kgzn–1. A peak power density of 464 mW cm–2, higher than that of commercial Pt/C, is obtained for Pt1Ni1/NC-based ZAB. This work offers a innovative approach to synthesize precious-metal-based catalysts with promising activity and durability for applications in fuel cells and metal–air batteries.
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Nano Research
·
2021
·Vol. 15
·期 1
·653-658
·
IF 8.897
Sun Shijie,Guan Yurou,Hao Zhenliang,Ruan Zilin,Zhang Hui,Lu Jianchen,Gao Lei,Zuo Xiaoqing,Cai Jinming
Graphene nanoribbons (GNRs) not only share many superlative properties of graphene but also display an exceptional degree of tunability of their electronic properties. The bandgaps of GNRs depend greatly on their widths, edges, etc. Herein, we report the synthesis path and the physical properties of atomic accuracy staggered narrow N = 8 armchair graphene nanoribbons (sn-8AGNR) with alternating “Bite” defects on the opposite side. The intermediate structures in the surface physicochemical reactions from the precursors to the sn-8AGNR are characterized by scanning tunneling microscopy. The electronic properties of the sn-8AGNR are characterized by scanning tunneling spectroscopies and d//d V mappings. Compared with the perfect N = 8 armchair graphene nanoribbons (8AGNR), the sn-8AGNR has a larger bandgap, indicating that the “Bite” edges can effectively regulate the electronic structures of GNRs.
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