POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 9
·2020-2030
·
IF 2.578
Shijun Long,Di Qiu,Ren Long,Xun Li,Hanyu Chen,Yiwan Huang,Xuefeng Li
In order to improve the performance of inorganic/organic composites, aluminum trihydroxide (ATH) core composites with a styrene-ethylene-butadiene-styrene block copolymer grafted with maleic anhydride (MAH- g -SEBS) shell phase, and P-N flame retardant as a synergistic agent, were prepared through an interface design. The effects of polyethylene glycol (PEG) content on the interfacial interaction, flame retardancy, thermal properties, and mechanical properties of high-density polyethylene (HDPE)/ATH composites were investigated by small angle X-ray diffraction, rotational rheometer, limiting oxygen index, thermogravimetric analysis (TGA), and tensile testing. The ATH synergistic effects of P-N flame-retardant improved the combustion performance of HDPE/ATH/PEG(3%)/MAH- g -SEBS/P-N (abbreviated as HDPE/MH3/M- g -S/P-N) composite by forming more carbon layer, increased the elongation at break from 21% to 558% compared to HDPE/ATH, and increased the interface thickness from 0.447 to 0.891 nm. SEM results support the compatibility of ATH with HDPE increased and the interfacial effect was enhanced. TGA showed the maximum decomposition temperature of the two stages and the yield of the residue at high temperature increased first and then decreased with the increase of PEG content. Rheological behavior showed the storage modulus, complex viscosity, and the relaxation time initially increased and then decreased with the increase of PEG content indicating PEG, M- g -S, and ATH powder gradually formed a partial coating, then a full coating, and finally an over-coated core-shell structured model.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 26
·2310226
·
IF 13
Zhongwei Man,Zheng Lv,Yangyang Cao,Zhenzhen Xu,Qing Liao,Jiannian Yao,Feng Teng,Aiwei Tang,Hongbing Fu
Organic afterglow materials have significant applications in information security and flexible electronic devices with unique optical properties. It is vital but challenging to develop organic afterglow materials possessing controlled output with multi-stimuli-responsive capacity. Herein, dimethyl terephthalate (DTT) is introduced as a strong proton acceptor. The migration direction of N─H protons on two compounds Hs can be regulated by altering the excitation wavelength (Ex) or amine stimulation, thereby achieving dual-stimuli-responsive afterglow emission. When the Ex is below 300 nm, protons migrate to S 1-2 DTT , where strong interactions induce phosphorescent emission of Hs , resulting in afterglow behavior. Conversely, when the Ex is above 300 nm, protons interact with the S 0 DTT weakly and the afterglow disappears. In view of amine-based compounds with higher proton accepting capabilities, it can snatch proton from S 1-2 DTT and redirect the proton flow toward amine, effectively suppressing the afterglow but obtaining a new redshifted fluorescence emission with Δλ over 200 nm due to the high polarity of amine. Moreover, it is successfully demonstrated that the applications of dual-stimuli-responsive organic afterglow materials in information encryption based on the systematic excitation-wavelength-dependent (Ex-De) behavior and amine selectivity detection.
研究领域:
材料科学
·
光学材料
·
刺激响应材料
·
信息加密
·
物理化学
✓ 已验证
DOI
高影响因子
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.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 8
·3604-3623
·
IF 3.5
Wang Xintong,Yang Jiang,Chen Xu,Wang Yefei,Yang Zhen,Ding Wei
To mitigate CO 2 corrosion in the oil and gas industry, a green non-toxic β -N-butyl amino propionic acid (BAA) was synthesized using a low-energy and zero-waste one-pot method. The effectiveness of BAA as a corrosion inhibitor for N80 steel in CO 2 -saturated brine water was investigated through experimental measurements and theoretical modeling. The results demonstrate that BAA functions as an effective mixed-type corrosion inhibitor. BAA molecules interact with F (1 1 0) with the–COO– and–NH 2 + -moiety in the hydrophilic head group, and the hydrophobic groups are adsorbed on the steel surface in a configuration 45° away from the steel surface. The adsorption is a mixture of physical and chemical processes and is consistent with the Langmuir isothermal adsorption formula. When the concentration is greater than 50 ppm, a complete corrosion inhibitor film with high hydrophobicity can be adsorbed on the steel surface, which can effectively impede the diffusion of corrosive species from brine to the steel surface. Graphical abstract
研究领域:
腐蚀科学
·
材料工程
·
环境化学
·
石油天然气工业
✓ 已验证
DOI
高影响因子
SYNLETT
·
2018
·Vol. 29
·期 09
·1244-1248
·
IF 2.369
Xiangwen Kong,Lihua Liu,Siqin Luo,Shilu Fan,Haisheng Qian,Hua Xiao
A triphenylphosphine-promoted [3+2] cycloaddition of α,γ-bis-substituted allenoates and N-tosylaldimines followed by alkene isomerization was disclosed, affording a series of functionalized 2-pyrroline derivatives in moderate chemical yields with random diastereoselectivities.
研究领域:
有机化学
·
药物化学
·
合成方法学
·
杂环化学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xiang Shen,Tiande Xie,Jiangang Wang,Fan Wang
In this work, poly(N-acryloylmorpholine)-grafted ZrO 2 nanoparticles (ZrO 2 -g-PACMO) were directly blended with poly(vinyl chloride) (PVC) to prepare a hybrid membrane via the phase inversion method. In addition, the effects of ZrO 2 -g-PACMO and ZrO 2 nanoparticles on the structure and performance of resultant PVC membranes were comparatively investigated. The results indicated that the PVC/ZrO 2 -g-PACMO membrane exhibited a large macroviod of cross-section and a rough membrane surface. During membrane formation, the hydrophilic PACMO chains were preferably enriched onto the membrane surface, leading to the enhancement of surface hydrophilicity and the reduction of adhesion force between protein and membrane surface. The amount of adsorbed bovine serum albumin (BSA) on the poly(vinylidene fluoride)/ZrO 2 -g-PACMO decreases about 73% and 48% respectively, compared with original PVC and PVC/ZrO 2 membranes. Cycle filtration of pure water and BSA solution (0.5 g/L) confirmed that the total and irreversible membrane fouling were remarkably suppressed after incorporating ZrO 2 -g-PACMO into PVC membrane. Although the original ZrO 2 nanoparticle was also found to improve the protein fouling resistance of PVC membrane, there was a fatal limitation that the original ZrO 2 exhibited an agglomeration tendency during the membrane formation. The outcomes of the present work demonstrate that the synthesized ZrO 2 -g-PACMO nanoparticles have the potential for the design and preparation of anti-fouling PVC membrane.
研究领域:
材料科学
·
膜技术
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 11
·49992
·
IF 2.52
Xiaoying Wang,Lili Wang,Bingyan Sun,Xiaomeng Chu,Xuteng Xing,Shaojie Liu,Erjun Tang
In this work, the sulfonated polystyrene brushes were grafted onto magnetic nanoparticles to obtain recoverable catalysts for efficient synthesis of ethyl N-phenylformimidate. First, the surface modification of Fe 3 O 4 with a particle size of about 10 nm was performed with the silane coupling agent of vinyl triethoxysilane (SG-151) to obtain Fe 3 O 4 with carbon–carbon double bonds on the surface (SG-Fe 3 O 4 ). Subsequently, SG-Fe 3 O 4 , styrene (St) and chloromethyl styrene (CMSt) were polymerized to obtain the magnetic chloromethylated polystyrene sphere (SG-Fe 3 O 4 @PS-Cl) with core-shell structure by solution copolymerization. Using St as monomer and SG-Fe 3 O 4 @PS-Cl as macromolecular initiator, the magnetic polystyrene brush of SG-Fe 3 O 4 @PS-PSt was obtained by activated regenerated electron transfer catalyst atom transfer radical polymerization. Finally, SG-Fe 3 O 4 @PS-PSt was sulfonated with sulfuric acid to form a magnetic sulfonated polystyrene brush of SG-Fe 3 O 4 @PS-PSH. SG-Fe 3 O 4 @PS-PSH was used as a recoverable acid catalyst to synthesize ethyl N-phenylformimidate. Due to the high loading of the sulfonic acid group of this catalyst, its added amount was lower than other solid acids such as p-toluenesulfonic acid. The results showed that the catalytic performance of SG-Fe 3 O 4 @PS-PSH was better than p-toluenesulfonic acid and commercial macroporous sulfonic acid resin. The external magnetic field can directly recover SG-Fe 3 O 4 @PS-PSH, simplifying the recovery of catalyst and reducing the catalyst loss. After recycling, the yield of ethyl N-phenylformimidate was not significantly decreased.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Junmei Luo,Shufeng Bo,Qingda An,Zuoyi Xiao,Haisong Wang,Weijie Cai,Shangru Zhai,Zhongcheng Li
Rational design of ordered catalytic composites with high performance and facile preparation method for environmental remediation still remains a tremendous challenge. For this vision, ordered composites with confined cobalt intercalated N/C layers (Co–N/C) were successfully prepared via carbonizing a mixture of cobalt species, histidine (His) and zirconium-containing SBA-15 (ZS) utilizing a simple non-solvent method. Taking the confinement effect and inherent hydrophilic groups (Si–OH) of mesoporous silica as the foothold, the strong Co 2+ /N or Co 2+ /O coordination (Co 2+ (–COO - or –NH 2 ) 2 and Co 2+ (–O - ) 2 ) and silica/His or His/His adhesive/cohesive interactions endowed the Co-based catalyst with optimal interfacial properties , cycling stability and magnetic separability for degradation of several pollutants (phenol, antibiotics and dyes). The degradation efficiency of Co@NC-ZS-700 for bisphenol A was superior to Co-ZS-700, NC-ZS-700 and Co@NC-SBA-700 due to the flaky structure with confined Co–N/C layers, which could achieve 95.0% within 20 min. In addition, the catalyst could still degrade more than 84.4% bisphenol A after five consecutive reactions. Based on the characterization analysis, tested active species (SO 4 •– , • OH and 1 O 2 ) and degradation products, double-process activation mechanism and degradation pathways were plausibly proposed (radical and non-radical processes). Additionally, various influencing factors, including carbonization temperature, amount of cobalt species, peroxymonosulfate (PMS)/catalyst dosage, pH value, coexisting ions and real water environment, were also systematically studied. This work might pave a feasible way for contaminant treatment utilizing ordered mesoporous silica composites with diffusion promoted channels involved under aqueous systems.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Kaiyi Su,Chaofeng Zhang,Yehong Wang,Jian Zhang,Qiang Guo,Zhuyan Gao,Feng Wang
ABSTRACT Although different NbO x units are present in Nb 2 O 5 -based catalysts, the correlations between these structures and activity remain unclear, which considerably hinders the further development of Nb 2 O 5 photocatalysis . Herein, we utilized N- hydroxyphthalimide (NHPI) as the probe molecule to distinguish the role of different NbO x units in the activation of C–H bond under visible light irradiation. With the addition of NHPI, Nb 2 O 5 catalysts with highly disordered NbO 6 units exhibited higher activities than that with slightly disordered NbO 6 units (419–495 vs . 82 μmol·g −1 ·h −1 ) in photocatalytic selective oxidation of ethylbenzene . Revealed by Raman spectra, electron paramagnetic resonance spectra, and transmission-electron-microscopy images, highly disordered NbO 6 units were confirmed to act as the active sites for the transfer of photogenerated electrons from NHPI, promoting the generation of phthalimide- N -oxyl (PINO) radicals for the enhanced conversion of ethylbenzene under visible light irradiation. This study provides guidance on the role of local NbO x units in Nb 2 O 5 photocatalysis.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 10
·7902-7907
·
IF 3.289
Sihua Qian,Yumin Leng,Hengwei Lin
Colorimetric sensor arrays demonstrate numerous superior features in chemo- and bio-sensing, but they are generally not applicable to less-reactive analytes. Based on the findings that N-methyl carbamate pesticides could be decomposed into reactive phenols in basic media, herein, a novel strategy of strong base pre-treatment was developed and employed for the colorimetric sensor array detection and differentiation of the N-methyl carbamate pesticides in an indirect manner. With the use of five inexpensive and commercially available phenol responsive indicators, such a colorimetric sensor array can be facilely fabricated. Classification analysis (e.g. hierarchical clustering analysis (HCA) and principal component analysis (PCA)) reveals that the as-fabricated sensor array has an extremely high dimensionality and, consequently, exhibits excellence in discriminating a variety of N-methyl carbamates from other types of pesticides and potential interferants, and further identifying them exactly from each other. Moreover, semi-quantitative detection could also be achieved through combining HCA/PCA, recognition patterns, and corresponding fitting curves. Overall, the as-developed method exhibits high selectivity and sensitivity, good anti-interference, simultaneous detection and identification capability for each of the N-methyl carbamate pesticides, and potential applicability in real samples. Most importantly, this study demonstrates that pre-treatment strategies are very effective in expanding the range of applications of colorimetric sensor array methodology to less-reactive analytes.
研究领域:
分析化学
·
环境科学
·
农业科学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Lili Geng,Jianjun Gong,Guilong Qiao,Songshou Ye,Jinbao Zheng,Nuowei Zhang,Binghui Chen
Pt(NH3)4(NO3)2, Pt(NH3)4(Ac)2, (NH4)2PtCl4, and H2PtCl6 were used to prepare Pt/SAPO-11 catalysts to investigate the effect of Pt precursors on the hydroisomerization of n-dodecane. The catalyst derived from Pt(NH3)4(NO3)2 displays the best hydroisomerization activity and selectivity among these precursors. The hydroisomerization conversion of n-dodecane is affected by the platinum particle size, platinum dispersion, the location of platinum, and the valence state of platinum. The selectivity of n-dodecane is determined by the number of Brønsted acid sites and Pt crystal planes. These conclusions are verified by combining transmission electron microscopy, high-resolution transmission electron microscopy, hydrogen temperature programmed reduction, NH3-temperature programmed desorption, and Py-IR studies. The catalyst prepared with Pt(NH3)4(NO3)2 as the precursor exhibits the smallest platinum particle size and the highest platinum dispersion. Most of the platinum particles are supported on the external surface of SAPO-11 with the Pt(111) crystal face. Such a catalyst also possesses a suitable number of Brønsted acid sites and then displays the best catalytic performance. Obviously, the use of various precursors for the Pt-based catalyst can significantly affect the performance of Pt/SAPO-11 for the hydroisomerization of n-dodecane.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yu Cheng,Haoran Guo,Pengfei Yuan,Xinpan Li,Lirong Zheng,Rui Song
To satisfy the practical requirements of electrochemical water splitting, developing a flexible, effective and sustainable approach for scalable production of bifunctional electrocatalyst for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is a tremendous issue to be rationally addressed. Herein, a solid-state diffusion strategy with Ni foam and N-doped carbon layers is applied to prepare multi-interfacial, self-supported and N-doped carbon nanotube (NCNT) encapsulated Ni nanoparticles (NPs) array bifunctional electrocatalyst (NCNT-NP@NF). Prominently, this NCNT-NP@NF is scalable to meet the application requirements and can be used as a binder-free electrode for direct the water splitting. The optimal sample demonstrate outstanding HER/OER performance in 1.0 M KOH, with low overpotential ( η 10 ) at 10 mA cm −2 during HER (96.1 mV) and OER (240 mV) process, which is extremely superior to the most reported metal-based electrocatalysts and even better than commercial IrO 2 (400 mV at 10 mA cm −2 for OER). Strikingly, when these bifunctional electrocatalysts are employed in a dual-electrode electrolyzer for water splitting, the NCNT-NP@NF only needs cell voltage of 1.54 V to drive overall water splitting in 1.0 M KOH, and displays excellent long-term stability (150 h for water splitting). Moreover, experiments combined with density functional theory (DFT) calculations clarify that the remarkable electrochemical activity and stability are mainly attribute to the synergistic effect of the uniform distribution of Ni NPs, heteroatomic doping, as well as district confinement effect of NCNT leading to enhanced electronic multi-interfacial transmission, all these factors co-accelerate electrocatalytic kinetics. Accordingly, this solid-state diffusion method possesses a favorable potential to construct a multi-interfacial and self-supported electrocatalysts in the fields of sustainable supply of clean energies.
研究领域:
电化学
·
材料科学
·
催化
·
能源材料
·
可持续能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）