INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Chenxiao Lin,Demei Yu,Jixia Wang,Yan Zhang,Dong Xie,Faliang Cheng,Shiguo Zhang
Anion exchange membrane (AEM) fuel cells have received significant attention due to their low fuel permeability and the use of non-platinum catalysts. However, the development of AEMs with robust chemical stability and high conductivity is still a great challenge. Herein, we prepare a new type of partially fluorinated backbone bearing pendent N-spirocyclic quaternary ammonium (QA) cations via a facile Williamson reaction , which displays great potential for fuel cells. The integration of the two substructures (a fluorinated moiety into a polymer backbone and a pendent cation structure) is beneficial for the fabrication of a well-defined micro-phase separation structure, thereby facilitating the construction of a highly-efficient ion transporting pathway. Correspondingly, the resulting AEM (PAENQA-1.0), despite its a relatively low ionic exchange capacity (0.93 meq g −1 ) demonstrates a conductivity of 63.1 mS cm −1 (80 °C). Meanwhile, the constrained ring conformation of N-spirocyclic QA results in improved stability of the AEMs.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 11
·3039-3047
·
IF 3.146
Zhang Pan,Zhao Yuetong,Tian Xiangfeng,Ji Yanxi,Shu Yuxuan,Fu Kun,Fu Dong,Wang Lemeng
Tetramethylammonium glycine ([N 1111 ][Gly]) can be completely ionized into cation [N 1111 ] + and anion [Gly] - in aqueous solution. The anion contains an amino -NH 2 and a carboxyl -COO - , both of which can react with hydrogen sulfide (H 2 S). Therefore, [N 1111 ][Gly] was used to promote the selective absorption of H 2 S in coke oven gas (COG) by N-methyldiethanolamine (MDEA). The absorption performance and selectivity of H 2 S in the aqueous solution of MDEA-[N 1111 ][Gly] were investigated. The effects of MDEA mass fraction, [N 1111 ][Gly] mass fraction, temperature, H 2 S partial pressure and CO 2 partial pressure on the absorption capacity and selectivity were clarified. The results showed that an aqueous solution of MDEA-[N 1111 ][Gly] has good selectivity for H 2 S in COG. The absorption capacity was large and the mass fraction of the solute in the absorbent reached more than 0.55, thereby having outstanding advantages in the aspects of saving energy consumption and operating cost and having a good application potential.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2016
·Vol. 48
·期 2
·243-250
·
IF 2.395
Lin Wang,Yan Zhang,Wenqi Zhang,Tianrui Ren,Feng Wang,Haifeng Yang
Silver nanoparticle (AgNP)/poly( N -isopropylacrylamide) (PNIPAAm) composite solution was electrospun followed by crosslinking to fabricate AgNP/PNIPAAm composite nanofiber mats. Embedded AgNPs were found to align along the PNIPAAm nanofibers, which generate more hotspots upon laser-induced plasmonic heating. This kind of AgNP/PNIPAAm mats show enhanced surface-enhanced Raman scattering (SERS) effect upon continuous pulsed laser irradiation, showing a ‘laser heating sensitive’ SERS effect. Laser-induced plasmonic heating can also tune the temperature-responsive interaction between PNIPAAm and analytes and has been applied in the on-site ‘laser heating sensitive’ separation and SERS detection of analytes. The composite nanofiber mats also showed good reproducibility and stability. What is more, this ‘laser heating sensitivity’ has also been applied in the direct SERS detection of adenosine in urea solution without urea interference. Together with the advantages of ease of large-scale fabrication, stable and ‘laser heating sensitivity’, AgNP/PNIPAAm mats might find application in sensitive multicomponent biosensing. Copyright © 2016 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
CORROSION
·
2013
·Vol. 69
·期 7
·672-680
·
IF 1.772
Jiang Y.Y.,Chen Y.,Ye Z.Y.,Chen H.,Zhang Z.,Zhang J.Q.,Cao C.N.
N-[2-[(2-aminoethyl) amino] ethyl]-9-octadecenamide (AAOA) has been synthesized in the lab, then tested as an effective and economic acid inhibitor for A3 steel in an acid medium with electrochemical techniques (electrochemical impedance and polarization curve). The results show that AAOA acts as a good mixed-type inhibitor for A3 steel in 1 M hydrochloric acid (HCl) solution, and the inhibition efficiency reaches 94% at the concentration of 200 mg/L. The corrosion current density of A3 steel increases with the increasing temperature from 20°C to 60°C. Meanwhile, Langmuir isotherm is found to provide the description of the adsorption behavior of AAOA, and the value of adsorption free energy (ΔG 0 ) is as low as low as −37.3 kJ/mol. One can assume the adsorption of inhibitor molecules on the metal surface is by chemisorption, which has been understood taking into account some other adsorption parameters (ΔH 0 , ΔS 0 ) and the activation parameters (E a , ΔH * , ΔG * ).
研究领域:
材料科学
·
腐蚀与防护
·
电化学
✓ 已验证
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2019
·
IF 3.485
Tao Feng,Junjie Niu,Bin Pi,Yingjie Lu,Jinning Wang,Wen Zhang,Bin Li,Huilin Yang,Xuesong Zhu
High brittleness and lack osteogenesis are two major limitations of calcium phosphate cement (CPC) in application in bone defect reconstruction. Here we prepared a composite calcium phosphate cement by mixing N-acetyl cysteine loaded silk fibroin solution with α-tricalcium phosphate. In vitro cytology experiment revealed that SF-NAC/α-TCP could significantly increase the activity of exocrine ALP and up-regulated expression of bone-related genes. However, NAC up-regulated gene expression could be significantly suppressed by DKK1. We propose that NAC functioning as osteogenic factor by activating the Wnt/β-catenin signaling pathway may be the possible mechanism of up-regulation of osteogenic genes. Bone regeneration in vivo shown in a rat femur defect was enhanced by the addition of NAC in SF/α-TCP. In addition, the combination intensity of cement-bone interface was improved. The combination SF-NAC/α-TCP might be developed into a promising tool for bone tissue repair in the clinic.
研究领域:
生物材料学
·
骨组织工程
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Chuanyun Yang,Xingjian Zhang,Zhengdao Li,Zhishuai Wang,Jiping Shi,Haiquan Xie,Ting Li,Yong Zhou
A series of hybrid films were designed and fabricated by in situ growth of Ag 2 S nanoparticles with varying content on BiVO 4 nanosheets deposited on stainless steel mesh. The formation of a p-n heterojunction between Ag 2 S and BiVO 4 enabled an extended spectral response range and facilitated the separation of charge carriers through a single directional pathway for electron transport. Exploiting these advantages, Ag 2 S/BiVO 4 composites were employed in various photocatalytic applications under simulated solar irradiation. The results demonstrated, in terms of water purification, that the composite not only possessed photocatalytic ability to degrade RhB or Cr(VI) individually but also exhibited significantly enhanced photocatalytic efficiency in simultaneously removing mixed pollutants containing RhB and Cr(VI). In terms of CO 2 conversion, Ag 2 S/BiVO 4 also displayed a stronger photocatalysis capability compared to pure BiVO 4 film. Furthermore, the immobilized Ag 2 S/BiVO 4 film exhibited improved mechanical strength and long-term stability, making it highly suitable for practical applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Wanjun Jin,Cheng Li,Meiyi Zou,Yu Lu,Ming Wei,Lijing Nan,Yue Jia,Chengjian Wang,Linjuan Huang,Zhongfu Wang
Sialylated N-glycans are an integral component of whey proteins in human milk and play an irreplaceable role in infant growth and development. Currently, there are few studies on quantitative comparison of sialylated N -glycans in milk obtained at different lactation stages. Here, a preliminary isomer-specific quantification of whey sialylated N -glycans of human colostrum milk (CM) and mature milk (MM) was performed by using our recently developed glycoqueuing strategy. Such a preliminary comparison revealed that the whey sialylated N -glycan content was 86.4% lower in MM than in CM. Twenty-three α2,6-linked sialylated N -glycan isomers were detected with no α2,3-linked isomer observed. For the first time, three mono-sialylated and four bi-sialylated glycan isomers were reported. With the prolongation of lactation, the relative abundance of mono-sialylated glycans increased, whilst the relative abundance of bi-sialylated glycans decreased significantly. These findings contribute to the understanding of the structure–function relationship of sialylated N -glycans in the human whey fraction.
研究领域:
营养学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yushun Zhou,Taimei Cai,Shuai Liu,Yanyan Liu,Huijie Chen,Zhongtian Li,Jun Du,Zhiqiang Lei,Hailong Peng
Organic contaminants in aquatic ecosystems have raised serious environmental concerns and pose severe risks to human health, and the catalytic efficiency of traditional TiO 2 catalysts has been greatly limited by photogenerated electron/hole recombination. Therefore, a novel catalyst of N-doped magnetic three-dimensional (3D) carbon microspheres@TiO 2 with a nanofibrous porous architecture (N-doped MCMs@TiO 2 ) was developed from the low-cost biomass of chitin. The N-doped MCMs@TiO 2 consist of N-doped carbon nanofibers, a 3D porous architecture, and a high surface area. TiO 2 nanoparticles were uniformly immobilized on the N-doped carbon nanofibers, resulting in many catalytic sites. The current density of N-doped MCMs@TiO 2 was approximately 0.247 uAcm −2 with 1.65 times than that of pure TiO 2 , and the bandgap of N-doped MCMs@TiO 2 was only 1.91 eV. Additionally, N-doped MCMs@TiO 2 had excellent adsorption capability for tetracycline (TC) (60.38%) and methyl orange (MO) (40.15%) in the dark after 40 min. Under the optimized conditions, N-doped MCMs@TiO 2 exhibited remarkable photodegradation performance for MO and TC mixture solutions, the degradation efficiencies of MO and TC were approximately 83.80% and 74.37% under UV irradiation, and that of was maintained at 68.07% and 76.55% even in cloudy weather, respectively. Meanwhile, N-doped MCMs@TiO 2 possess good potential for practical applications with long-term stability and can be easily recycled from solutions under an external magnet. Therefore, this work provides new insight into the fabrication of low-cost biomass-based 3D hierarchical porous carbon materials and that can be used as high-performance photocatalysts for the degradation of organic contaminants.
研究领域:
环境科学
·
材料科学
·
生物工程
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 35
·23013-23024
·
IF 3.906
Gehong Su,Liyang Jia,Xueqian Zhang,Yulin Zhang,Pengchi Deng,Tao Zhou
It is important to investigate the phase transition mechanism of stimuli-sensitive hydrogels due to its great guiding significance for the application of stimuli-sensitive hydrogels in biomedical applications. In this work, the novel thermo-sensitive poly(N-vinylcaprolactam-co-hydroxyethyl methacrylate) (PVCL-co-HEMA) hydrogel was successfully synthesized via free radical polymerization, and then temperature-dependent FTIR spectra combined with the newly developed scaling moving-window two-dimensional (scaling-MW2D) correlation spectroscopy and generalized two-dimensional correlation analysis were utilized to investigate its volume phase transition (VPT) mechanism upon heating. Conventional 1D FTIR spectra and Boltzmann fitting results revealed that the PVCL-co-HEMA hydrogel exhibited a distinct VPT behavior from the neat PVCL hydrogel due to the incorporation of PHEMA. The essential reason is that some water molecules were still confined in the PVCL-co-HEMA network after phase transition at high temperature, rather than continuously being expelled out of the gel with the increase of temperature. Scaling-MW2D spectra revealed that the phase transition of the PVCL-co-HEMA hydrogel could be divided into two steps (I and II), and further confirmed that the transition regions of these two steps were 25.0–32.3 °C and 32.3–46.8 °C, respectively. The transition regions of both these steps were obviously lower than those of the neat PVCL hydrogel. According to the generalized 2D correlation analysis of step I, we concluded that the dissociation of the hydrogen bonds between the incorporated PHEMA moieties and water molecules is the driving force for the local hydrophobic domain formation process (step I), and its occurrence at a lower temperature is the main reason for the decrease of the VPTT of the PVCL segments. Furthermore, we found that the dissociation of the hydrogen bonds between the COVCL groups and water molecules is the driving force for the chain collapse (step II), and the driving effect of the PVCL segments on PHEMA during the phase transition was confirmed. Combined with the obtained sequential order of steps I and II, an unusual two-step VPT mechanism for the PVCL-co-HEMA hydrogel upon heating was proposed.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 9
·095704
·
IF 1.449
Meng Xia,Shenxin Pan,Yujie Sun,Qiuzhu Luo,Zhengping Fang,Peixin He,Jing Fu,Yuhong Zhang
As a new generation of smart materials, poly(N-isopropylacrylamide) (PNIPAM) is studied for its wettability transition mechanism, which is necessary for the development of the next generation of wettability transition materials. Herein, we minutely report the effects of temperature on the wettability of solid-oil-water and solid-water-air interfaces for the first time. The PNIPAM hydrogel surface (PHS) became less hydrophilic and less lipophobic with the temperature increasing, and the sharply changes in wettability occur range from 28 °C to 32 °C. Furthermore, unlike previous assumptions, our data about resonance Raman spectroscopy and molecular dynamics simulation suggest that dehydration of isopropyl is more likely to be a cause of drastic changes in wettability. This study suggests a novel foundation to comprehend the wetting behavior of smart PNIPAM gelation surface.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Peiyuan Mao,Yong Wang,Pandeng Xiao,Wen Zhang,Shun Rao,Zhi Wang
Herein, we demonstrate the reasonable design and preparation of yolk-heteroshell Sn@N-doped C@MoS 2 nanospheres as anode materials in sodium-ion battery. Through an effective multi-step strategy, Sn nanoparticles are encapsulated in N-doped C nanocage surrounded by ultra-thin MoS 2 nanosheets to form Sn@N-doped C@MoS 2 nanospheres. In this novel structure, Sn nanoparticles with high theoretical capacity improve the space utilization inside the heteroshell; the N-doped carbon nanocage as the skeleton not only inhibits the mutual accumulation of Sn and MoS 2 , but also improves conductivity; the outer MoS 2 ultra-thin sheets can consolidate C@MoS 2 heteroshell, provide numerous active sites and favor the fast diffusion of Na + /e - . Notably, the combination of carbon nanocage and MoS 2 sheets in the yolk-heteroshell structure can effectually buffer the volume expansion of Sn nanoyolks and reinforce C@MoS 2 heteroshell while reducing the carbon content. Therefore, the yolk-heteroshell structure plays a crucial role in enhanced reversible capacity and cyclic stability of Sn@N-doped C@MoS 2 nanospheres, which activates their sodium storage potential. The yolk-heteroshell Sn@N-doped C@MoS 2 nanospheres exhibit high reversible capacity of 488.4 mAh g −1 at 0.1 A g −1 after 300 cycles and long-cycle stability of 350.6 mAh g −1 at 0.5 A g −1 after 500 cycles. Moreover, their full cell delivers a stable reversible discharge capacity of about 80.1 mAh g −1 after 30 cycles at 0.5 C. This work provides a feasible yolk-heteroshell strategy for Sn-based composite nanomaterials .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2015
·Vol. 42
·期 3
·2211-2220
·
IF 1.221
Liu Shuilin,You Kuiyi,Jian Jian,Luo Qing,Liu Pingle,Ai Qiuhong,Luo He’an
A simple and effective approach for highly selective preparation of nitrocyclohexane from cyclohexane using tert-butyl nitrite as a nitrating agent under atmospheric pressure has been successfully developed in this work. The results indicate that the N -hydroxyphthalimide catalyst gave the best results with 27.3 % of cyclohexane conversion and 88.0 % of selectivity to nitrocyclohexane under optimal reaction conditions. The present reaction provides a novel strategy for the synthesis of nitroalkanes from the nitration of low-carbon alkanes because of the mild reaction condition, simple experimental procedure and high selectivity towards the desired product. This method may be very significant to establish such a synthesis method for aliphatic nitro-compounds from the low-carbon alkanes in organic fields.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）