Polymer Chemistry
·
2013
·Vol. 4
·期 14
·3963-3967
·
IF 5.231
Guoyan Zhang,Jibin Zhang,Bai Yang
Polymerizable ZnS nanoparticles (NPs) were fabricated in N,N′-dimethylacrylamide via a novel facile and effective strategy, and a series of transparent bulk nanocomposites were also prepared based on such polymerizable ZnS NPs. The structure, surface chemistry and distribution of the polymerizable ZnS NPs were studied by powder XRD, FTIR, 1H NMR and TEM. The results indicated that we have successfully synthesized the polymerizable ZnS NPs with an average size of 4–5 nm by the innovatory method and the surface of these NPs were terminated with phenyl and vinyl groups which made sure of the good dispersion in the monomers. The polymerizable ZnS NPs could be easily polymerized with the monomers and fabricated a series of bulk nanocomposites. The obtained bulk nanocomposites (3 mm) exhibit good transmittance in the visible range and its refractive index are in the range from 1.527 to 1.598 in 632.8 nm by changing the content of the polymerizable ZnS NPs from 0 to 11.1 wt%. This novel strategy opens a new gate to produce transparent bulk nanocomposites with tunable refractive indices for potential optical device applications.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Hao Ling,Hongxia Gao,Zhiwu Liang
The physical solubility and mass transfer performance of CO 2 absorption into aqueous N,N-dimethylethanolamine (DMEA) solution were comprehensively studied in the present work. The physical solubility (Henry’s law constant ( He )) was measured using a stirred cell reactor for pure DMEA and aqueous DMEA at temperatures from 293.98 to 333.03 K. Then, the physical solubility of CO 2 was obtained based on the “N 2 O analogy” method. Furthermore, He was correlated successfully by using an empirical polynomial model with an average absolute relative deviation (AARD) of 4.23%. The mass transfer performance was studied in a laboratory scale structured packing absorption column at DMEA concentration of 1–4 kmol/m 3 , liquid feed temperature of 293.15–333.15 K, liquid flow rate of 3.90–11.7 m 3 /m 2 -hr, CO 2 partial pressure of 6–20 kPa, lean CO 2 loading of 0.050–0.300 mol/mol, over the inert gas flow rate range of 26.11–43.52 kmol/m 3 -hr. Based on the experimental values of He for CO 2 into aqueous DMEA solution, the effect of the gas concentration of A in gas-liquid equilibrium ( y A ∗ ) on gas phase volumetric overall mass transfer coefficient ( K G a v ) was considered in this study, but found to be an insignificant influence that can be ignored. Analogously, an attempt to correlate the mass transfer coefficient K G a v and outlet concentration of CO 2 ( y out ) using semiempirical models as function of the mentioned operational parameters was conducted. The predictive correlations for K G a v and y out of the DMEA-CO 2 -H 2 O system in structured packing column are K G a v = L 0.23 0.6144 a eq - a C / p C O 2 + 0.02327 and ln y out = l n y in - 0.77 PV G Ω L 0.23 0.6144 a eq - a C / p C O 2 + 0.02327 , with acceptable AARDs of 4.59% and 1.48%, respectively.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jingwei Zhu,Yu Liu,Benlin He,Wenyu Zhang,Lifang Cui,Sudong Wang,Haiyan Chen,Yanyan Duan,Qunwei Tang
The back interface issues including numerous defects and imperfect contact, mismatched energy level are regarded as the key detrimental factors causing serious charge recombination and energy loss ( E loss ) and inferior charge extraction to achieve high efficiency Hole transport materials-free (HTMs-free) carbon-based Perovskite solar cells (PSCs). To address this drawback, an effective interface engineering via depositing N, N'-Dicyclohexylcarbodiimide (DCC) at PVSK/Carbon back interface is creatively implemented to passivate CsPbBr 3 surface defects through forming interaction between N atoms with lone pair electrons and uncoordinated ions (eg Pb 2+ and Cs + ions) to suppress the defect states induced non-radiative recombination and E loss . Concurrently, the smoothness and valence band of PVSK film with DCC modification are increased to improve the contact and band alignment at back interface, respectively, remarkably accelerating hole extraction and transportation and also reducing E loss as well as charge recombination. As a result, the comprehensive performance of DCC interface modified HTMs-free carbon-based CsPbBr 3 PSCs is significantly enhanced, especially the champion efficiency boosts to 10.16% from 6.60% of the control PSC. Furthermore, owing to the enhanced hydrophobicity and decreased imperfections of PVSK film with DCC modification, the optimized device without any encapsulation displays an excellent long-term stability under 85% RH air condition at 85 °C over 1200 h.
研究领域:
材料科学
·
光伏技术
·
界面化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2018
·
IF 2.795
Mengjie Sun,Meng Li,Pin Wang,Xu Zhang,Cuiming Wu,Yonghui Wu
Anion exchange membranes are prepared by phase inversion of P84 co -polyimide to obtain porous structure, and then chemically modified by branched polyethylenimine. The porous membranes are compared with a dense P84 membrane. The dense membrane is hydrophobic with large area resistance (>85 Ω cm 2 ), while the porous membranes are hydrophilic with low area resistance (2.4–3.5 Ω cm 2 ), lower than that of commercial membrane CJMA-3 (6.0 Ω cm 2 ). The ion exchange capacities are in the range of 0.83–0.86 mmol/g and the water uptake values are 90–130%, both of which are higher than those of dense P84 membrane and CJMA-3 membrane (0.5–0.6 mmol/g; 15–20%). The P84 co -polyimide membranes are utilized in bipolar membrane electrodialysis (BMED) process to produce N -2-hydroxyethylpiperazine- N ′-2-ethanesulfonic acid (HEPES). The porous membranes can decrease the transport resistance of HEPES − ions and yield high recovery ratio and current efficiency, while the dense membrane is unsuitable for BMED . The output of HEPES is increased significantly if the membranes have finger- or tear-like pores, as well as higher ion exchange capacity. The HEPES − recovery ratios are 52.3–61.6% after running 6 h under 40 V, which are higher than that of membrane CJMA-3 (46.5%). The current efficiency can reach up to 86.1% and the energy consumption is only 3.92 kWh/kg by using the optimal porous membrane M-1, which are better than membrane CJMA-3 (65.5%, 5.15 kWh/kg). Hence, the porous membranes have high potential for producing organic acid with high molecular weight.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Wenbin Huang,Qiang Wei,Haoran Liu,Han Yang,Zhen Xu,Zhengyu Chen,Dongdong Chen,Yasong Zhou
The reason for high-difficulty nitrogen removal of aromatic N-heterocyclic compounds in petroleum fractions was investigated from the main thought of “NiWS property - Reaction behavior - DFT calculation”. The properties of the used catalyst were characterized by a series of techniques with the aim of providing the basis for model construction in the DFT calculations. The kinetic experiments in fixed-bed reactor revealed that although 1,2,3,4-tetrahydroquinoline (THQ1) and decahydroquinoline (DHQ), o-ethylaniline (OEA) exhibited relatively high yields in the HDN reaction of quinoline and indole respectively, they were all able to show high conversions and HDN rates when reacted as feedstocks alone. The study of product normalizations in the reaction system of the mixed feedstocks demonstrated that the difficulty of conversion of THQ1 and DHQ in quinoline HDN was mainly due to the inhibition effect of quinoline feedstock. While in the HDN of indole, the presence of the intermediate product OEA was the main factor for the low conversion of indole. This phenomenon of inhibition originating from within the molecular reaction network was proposed as N-N self-inhibition effect for the first time. The DFT calculations suggested that the inhibition of quinoline on THQ1 could be attributed to the adsorption advantage of quinoline, while the inhibition on DHQ was mainly due to the steric hindrance effect of DHQ itself. And the inhibition effect of OEA on indole can be mainly attributed to its greater nucleophilicity and stronger adsorption ability on the active sites compared with IND.
研究领域:
化学工程
·
催化
·
石油炼制
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Xu Zhang,Yaquan Wang,Xiao Wang,Hengbao Chen,Hongyao Li,Chao Sun,Liying Sun,Chunyang Fan,Cui Wang
In this study, an efficient route was developed to prepare high quality erionite (ERI) zeolite by hydrothermal conversion of faujasite (FAU) zeolite as an aluminosilicate source in the presence of N,N -dimethylpiperidinium hydroxide (DMPOH). Pure ERI zeolite was successfully synthesized within only 8 h by carefully controlling the alkalinity (OH − /SiO 2 ) of the initial gel and the proportion of DMP + and K + . Compared with the conventional ERI zeolite synthesized via a Charge Density Mismatch method, the FAU-derived ERI zeolites show superior properties such as higher crystallinity , smaller crystal size, larger micropore volume and better hydrothermal stability. In addition, catalytic test in the ethanol dehydration reaction shows that the ERI zeolites obtained from FAU exhibit extraordinary performances to those of the conventional one. Finally, crystallization process from FAU to ERI was investigated in detail by UV Raman and XRD . The results show that the framework of ERI zeolite is formed by rearrangement of 4-rings generated from the initial FAU zeolite.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 39
·51001
·
IF 3.125
Guoshuai Wang,Guancheng Jiang,Jun Yang,Lili Yang,Xinliang Li,Yinbo He,Xiangyang Chang
Ultra-high temperature dramatically deteriorates rheological properties and filtration performance of water-based drilling fluids (WBDFs), especially for a salt-gypsum formation that greatly restricts the application of WBDFs in ultra-deep well drilling operations. Hence, the research in this article used an anionic copolymer (DANS) prepared by N , N -dimethylacrylamide, 2-acrylamide-2-methylpropanesulfonic acid, N -vinylpyrrolidone, and sodium 4-styrenesulfonate as an anti-ultra-high temperature and anti-salt contamination filtrate reducer. Due to its multiple bulky cyclic structures in the side chain, DANS exhibits excellent thermal stability in the thermal gravimetric, rheological, and filtration tests. By adding 1.0 wt% DANS, the American Petroleum Institute (API) filtration volume of sodium bentonite-based fluids (SBT-BFs) decreased from 56.0 to 9.2 ml after aging at 240°C. Even under both 20 wt% NaCl contamination and 240°C aging, SBT-BFs with 2.0 wt% DANS could maintain a filtration volume of 9.4 ml, whereas SBT-BFs without DANS reached a filtration volume of 203.0 ml. The possible filtration control mechanism of DANS was further investigated via the Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), ζ potential, particle size distribution, filter cake micro-morphology, and transmission electron microscopy (TEM). Confirmed by FTIR and AFM results, the effective adsorption was formed between DANS and bentonite even under a high-salinity environment. Thus, a firm “dot net” structure formed by bentonite/DANS was observed by TEM, significantly improving the colloidal stability, dispersibility, and filter cake compactness of SBT-BFs. Finally, by utilizing DANS as the core treatment agent, a high-density WBDFs system with a temperature resistance of 240°C and a salt-tolerance of 20 wt% has been successfully prepared.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Rubber Research
·
2019
·Vol. 23
·期 1
·41-46
·
IF 0.281
Liao Xiao-Xue,Wei Yan-Chan,Zhang Hui-Feng,Zheng Ting-Ting,Luo Ming-Chao,Liao Shuangquan
Waste rubber with three-dimensional structure is insoluble and non-melting, which creates recycling problem. The technique called “high-pressure high-temperature sintering” (HPHTS) can convert vulcanized rubber powder into usable rubber products. However, reversion occurs when vulcanizates are exposed to a prolonged treatment at high temperature. This reversion results in the decrease of mechanical properties of sintered waste rubber powder (WRP) samples. To address this problem, a method of enhancing the mechanical properties of sintered WRP by incorporating different content of maleic anhydride (MA) and N , N ′- m -phenylene bismaleimide (BMI) is discussed in this paper. The results show that BMI and MA can slow down the formation of the conjugated double bonds. Through Diels–Alder reaction, BMI inhibits conjugated double bonds formation and improves the adhesion between particles and particles, which is beneficial to improvement of final properties. Therefore, BMI improves the mechanical properties of sintered WRP greatly.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Siying Chen,Linfeng He,Jing Zou,Shiyi Yang,Lingxin Chen,Yingna Hou,Dongmei Xu,Zhongda Yan,Sheng Li,Jianying Wu
Peracetic acid (PAA) has garnered considerable interest due to its exceptional disinfection properties and strong oxidizing capabilities. However, the coexistent hydrogen peroxide (H 2 O 2 ) in the PAA solution, which has similar chemical characteristics with PAA, makes accurate measurement of PAA concentration challenging. In this study, a rapid, sensitive, and reliable spectrophotometric method for determining PAA was developed. The method involves the oxidation of N , N -diethyl- p -phenylenediamine (DPD) by Co(II)-catalyzed PAA, resulting in the formation of a stable pink DPD radical (DPD ●+ ). It is worth noting that Co(Ⅱ) is an excellent PAA catalyst but is inactive with H 2 O 2 . Consequently, there is minimal interference from the coexistent H 2 O 2 in the determination of PAA. The absorbance of DPD ●+ at 551 nm was well linear (R 2 > 0.999) with concentrations of PAA in the range of 0–80 μM under optimized reaction conditions, and the limit of detection was determined to be low as 0.175 μM. Furthermore, the proposed Co(II)-DPD spectrophotometric method demonstrates strong resistance to common natural water constituents (ferric ions, sulphate ions, nitrate ions, chloride ions, bicarbonate ions, and humic acid) and is suitable for the accurate determination of PAA in natural water sources like groundwater and surface water. Additionally, the proposed Co(II)-DPD spectrophotometric method was dependable for quantifying PAA concentrations and monitoring PAA changes in Co(II)/PAA, Cu(II)/PAA, Fe(II)/PAA, and hydroxylamine/Fe(II)/PAA processes. In conclusion, the proposed Co(II)-DPD spectrophotometric method can be utilized as an alternative method for the rapid and accurate determination of PAA in water.
研究领域:
分析化学
·
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 64
·58970-58978
·
IF 3.289
Jun Yuan,Heng Li,Yong Gao,Duanguang Yang,Yijiang Liu,Huaming Li,Shaorong Lu
A robust method for the synthesis of well-defined polyurethane-graft-poly(N,N-dimethylacrylamide) (PU-g-PDMA) copolymers with good control over the graft density and the grafted chain length was presented in this study. Firstly, a functional polyurethane (fPU) polymer with lateral trithiocarbonate-based chain transfer agent group was synthesized by the polyaddition reaction of 2,2-bis(hydroxymethyl)butyl 2-(ethylthiocarbonothioylthio)-2-methylpropanoate (BEMP) with hexamethylene diisocyanate (HDI), and the subsequent chain extension reaction with 1,4-butanediol (BDO). The content of the chain-transfer groups in the synthesized fPU could be well tuned by altering the mole ratio of BEMP to HDI during the synthesis of the prepolymer. The produced fPU was then applied as the macro-RAFT agent to mediate the radical polymerization reaction of the N,N-dimethylacrylamide (DMA) monomers that were initiated by azobisisobutyronitrile (AIBN), resulting in well-defined amphiphilic PU-g-PDMA graft copolymers with a known graft density and tunable grafted chain lengths. The structure of the obtained PU-g-PDMA was characterized carefully using FTIR and 1H NMR. The average molecular weight and polydistribution of PU-g-PDMA copolymers were analyzed by GPC. The thermal properties of fPU and PU-g-PDMA copolymers were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The amphiphilic PU-g-PDMA graft copolymers could self assemble into spherical nanoparticles with a core–shell structure in water. The core–shell structured nanoparticles could be applied as emulsifiers for the formation of stabilized toluene-in-water Pickering emulsions, and an extremely low content of emulsifiers (∼0.01%) relative to the total weight of oil and water was required.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Wangchang Geng,Pengfei Song,Libing Duan,Tingyue Luan
Metal-organic frameworks (MOFs)-derived metal oxides have a high specific surface area and porous structure, making them promising for gas sensing applications. In this paper, MOFs-derived In 2 O 3 /ZnCo 2 O 4 composites were synthesized using a two-step solvothermal method. Through a series of characterization strategies, it is revealed that the morphology of the In 2 O 3 /ZnCo 2 O 4 composites consists of hollow microtubes and microflowers. The gas sensing performance of In 2 O 3 /ZnCo 2 O 4 composites was significantly enhanced compared to pure In 2 O 3 . Among them, the In 2 O 3 /ZnCo 2 O 4 -2 sensor exhibited superior performance towards 100 ppm n -butanol gas, with a lower operating temperature of 200℃, a higher response value of 208.7, a lower detection limit of 4.2 ppb, shorter response/recovery times of 152 s/223 s, higher selectivity, and better repeatability. Furthermore, the improved gas response can be attributed to the utilization of MOFs as self-sacrificial templates, the high specific surface area of the sensing materials, and the formation of p-n heterojunctions. This study provides a valuable reference for synthesizing n -butanol sensing materials with a high specific surface area, strong response, and excellent selectivity.
研究领域:
材料科学
·
化学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Chenghao Li,Jingye Sun,Ulla Sana,Yongjun Ma,Xianyan Ren,Cailin Liu
Herein, carbon dots (CDs) and N,N-dimethylaniline (DMA) were designed as a redox couple for redox-initiated polymerization of N-vinylcarbazole (NVC) under mild conditions. Several ratios of CDs to DMA and various temperatures were adopted to prove the feasibilities of the redox-initiated polymerization. Meanwhile, the CDs as fillers were encapsulated, crosslinked and passivated by the resulting poly (N-vinylcarbazole) (PVK) to form red emissive PVK-CDs composites with a fluorescence quantum yield up to 28.75%, which is significantly higher than that of pristine CDs. In particular, the loading of CDs also enhanced the electron-transfer properties and thermostability of PVK. Hence, this work not only applied CDs to redox-initiated polymerization of NVC so as to prepare CDs modified PVK, but also illustrated the electron-transfer properties of CDs in polymerization and PVK modification. Expectedly, by taking advantages of electron-transfer properties of CDs, it is expectable for redox-initiated polymerization to synthesize more CDs modified polymers for promising applications.
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 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）