ACS Applied Electronic Materials
·
2024
·
IF 4.3
Guodong Han,Ying Zhu,Yong Sun,Jiafu Wang,Shaobo Qu
The sandwich metamaterial based on “honeycomb-like” porous carbon combined ferroferric oxide (Fe3O4) was reported in this paper. By manipulation of the content of carbon and Fe3O4 for adjusting complex and permittivity and permeability, the as-prepared composite P–C-800@Fe3O4 unit cells were used to optimize the electromagnetic composite metamaterials for broadband absorption. For the normal incidence of electromagnetic waves, the sandwich metamaterials demonstrated an excellent broadband absorption in the frequency range of 5–18 GHz and achieved high absorption at low frequency. Meanwhile, the metamaterial structure also can display a wide-angle absorption performance from 0 to 45° for transverse electric (TE) and 0 to 75° for transverse mangentic (TM) mode. The results could contribute potentially to the development of metamaterial absorber applications based on traditional materials, and this research will provide an effective method of lightweight broadband and wide-angle microwave metamaterials for engineering applications in the future.
研究领域:
材料科学
·
电磁学
·
超材料
·
微波工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Huifang Guo,Jia Liu,Yunlong Shi,Xiaohong Xie
In this study, bio-based pyrrolidone (2-Pyr) and low-toxicity tetraethylammonium chloride (TEAC) were selected to prepare inexpensive, low-viscosity deep eutectic solvents (DESs), which is in line with the concept of green and sustainable chemistry and is suitable for industrial production. The highest absorption capacity of TEAC:2-Pyr (1:4) was determined to be 1.03 g SO2 /g DES at 20 °C. Eight absorption–desorption cycling tests were performed, and it was found that the absorption performance of DESs for SO 2 slightly varied. It was also proved that DESs have a certain degree of water resistance and high SO 2 selectivity. Fourier transform infrared spectroscopy and computational chemical analysis showed that the DESs composed of TEAC:2-Pyr formed intermolecular hydrogen bonds, the O atoms in Cl − and 2-Pyr played a role in the absorption of SO 2 , and hydrogen bonds were broken by the addition of SO 2 .
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2013
·
IF 2.386
Zhen Wang,Mengxiang Fang,Yili Pan,Shuiping Yan,Zhongyang Luo
A novel membrane vacuum regeneration (MVR) technology was developed to achieve lower regeneration energy demand for CO 2 absorption process. Sixteen different amine-based absorbents including primary, secondary, tertiary amines, polyamines, diamines, and sterically hindered amines were analyzed by combined absorption–desorption screening experiments for selecting the most effective absorbents for CO 2 membrane vacuum regeneration (MVR) technology. The CO 2 absorption experiments were conducted in a hollow fiber membrane contactor (HFMC) at 25 °C and 12.5 kPa CO 2 partial pressure. The CO 2 rich solvent was regenerated at 75 °C and 20 kPa regeneration pressure by using the MVR technology. The chain length, number of functional groups, side chain, and number of hydroxyl groups of amines were investigated to get a better understanding on the effects of the structure in the MVR process. The results show that the tertiary amines have greater regeneration performances than the primary amines, but the CO 2 absorption rates of the tertiary amines are worse than the primary amines. For the polyamines, the absorption performance of polyamines can be improved by increasing the number of amine groups while the MVR performance of the polyamines can be reduced. Steric hindered amines exhibited greater MVR performances. In addition, amines with steric hindrance effect caused by the substitution of hydroxyl group or methyl group to amine group in structure has also shown good performance in the MVR process for CO 2 desorption. The overall performance of amine-based absorbents was also investigated by an absorption–desorption characters analysis. It shows triethylenetetramine (TETA) and N -methyldiethanolamine (MDEA) have great average CO 2 absorption rates and relatively high cyclic capacities per mole absorbent, and ethylenediamine (EDA) is considered to be the promising absorbent as cyclic capacity in mol CO 2 /kg absorbent. Diethanolamine (DEA) and 2-Amino-2-methyl-1-propanol (AMP) are found to have the best overall performances in terms of CO 2 absorption rate at lean loading and cyclic capacity in mol CO 2 /mol absorbent. In terms of overall performance, MDEA is mostly recommended for using in MVR process. Sweeping steam can significantly improve MVR performance in most selected absorbents except AMP and 2-amino-2-hydroxymethyl-1,3- propanediol (THAM) absorbents which present the potential to reduce the regeneration energy demand by operating without sweeping steam. The study also finds that MVR shows better regeneration performance as compared to traditional thermal regeneration process at the same regeneration temperature.
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
SEPARATION SCIENCE AND TECHNOLOGY
·
2013
·
IF 1.164
Guangfei Qu,Jun Zhang,Junyan Li,Ping Ning
Two kinds of phosphate ionic liquids were synthesized and their SO2 absorption performance was investigated. It was found that both ionic liquids could readily absorb SO2, and the absorption capacity could reach 2.8 and 2.7 mol SO2 per mole ILs, respectively, at ambient temperature and under normal pressure. Moreover, the cycle of SO2 absorption and desorption from ionic liquids was repeated for four times and no change in the absorption capacity was observed. FT-IR spectrum and 1H NMR were used to characterize the microstructure of SO2-absorbed ILs and ILs, analysis showed that both ionic liquids absorbed SO2 purely by physical absorption. Comparing with the previous reported ionic liquids such as [Bmim][PF6] and [Emim][BF4], the synthesized ionic liquids showed higher absorption capacity, due to the anion based phosphate (O˭P‒O) with the free electrons on the oxygen interacting with the Lewis acidic sulfur of SO2, and then showing a great affinity for SO2.
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
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Kaixuan Shen,Han Zhao,Yihao Zhao,Xiaoxiang Wang,Ping Cheng,Congfei Yao,Jie Zhang,Yongpeng Yang,Weijia Huang
With regard to the physical absorbents for CO 2 removal, the alteration of carbon-chain structure may benefit the CO 2 absorption performance. However, the relationship between the carbon-chain structure of ketones absorbents and their CO 2 absorption capacity has rarely been studied, and the related mechanism is unclear. In this study, theoretical calculations and thermodynamic experiments were carried out to explore the effects of the carbon-chain length and isomerism of ketones on their CO 2 absorption performance. The density functional theory (DFT) simulations show that the F-∥ configuration is more stable than the others for the CO 2 +ketone complex in most cases. The followings are obtained according to the experimental results, which are pretty consistent with DFT calculations. The dissolution of CO 2 in the ketone is a typical physical process. As the number of carbon atom increases, the CO 2 absorption capacity of straight-chain ketones increases. Straight-chain ketones exhibit higher CO 2 absorption capacity than branched-chain ones. The effect of increasing carbon-chain length and isomerism on CO 2 absorption capacity are both stronger for the ketones with fewer carbon atoms; the influence mechanism can be attributed to different degrees of weak hydrogen-bond interaction between CO 2 and ketone molecules, suggested by the DFT simulation results. The above conclusions are beneficial for the development of potential CO 2 capture absorbents. In addition, the industrial application feasibility of surveyed ketone absorbents is also discussed.
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
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Wei Zhao,Lurui Wan,Zhiyong Xu,Xuefei Li,Yang Lan,Wenbo Zhao,Jing Chen
The viscosity and absorption capacity are important factors in evaluate the performance of SO 2 absorbent, but it is not an easy task to balance the contradiction between them. Herein, we designed and synthesized a novel aminosiloxane (3-diethylaminomethyl-1,1,3,3-tetramethyl-disiloxyalkyl methyl)-diethylamine (DTDA) with double absorption sites. This absorbent has low viscosity before and after absorption, with 3.41 mPa·s and 180.00 mPa·s at 303.15 K, respectively. The absorption capacities of DTDA can reach 3.42 mol/mol (303.15 K, 1.00 atm) and 1.71 mol/mol (303.15 K, 0.02 atm). The desorption of SO 2 can be realized at 363.15 K with good cyclic absorption performance. Moreover, with the introduction of dimethyl silicone oil (DSO), a mixed absorption system (DTDA-DSO) with liquid-liquid phase-change behaviors was obtained. The mixed absorption system not only shows better thermal stability but also needs lower thermal desorption energy consumption. The excellent absorption performance of DTDA-DSO system makes them have great potential in the field of SO 2 capture and could provide strong support for their industrial application.
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
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Mengyi Zhang,Xiaohui Sun,Xudong Cai,Xiaolu Zhan,Yufei Wu,Xuyang Zhang,Guohua Wu,Xiangwei Wang
In the field of electromagnetic wave (EMW) absorption, carbon matrix materials based on metal–organic frameworks (MOFs) have drawn more interest as a result of their outstanding advantages, such as porous structure, lightweight, controlled morphology, etc. However, how to broaden the effective absorption bandwidth [EAB; reflection loss (RL) ≤ −10 dB] is still a challenge. In this paper, large microsphere structures of a Co/C composite composed of small particle clusters were successfully prepared by the solvothermal method and annealing treatment. At a filling ratio of 40 wt %, the Co/C composite shows attractive microwave absorption (MA) performance after being annealed at 600 °C in an atmosphere of argon. With an EAB of 6.32 GHz (9.92–16.24 GHz) and a thickness of just 2.57 mm, the minimum RL can be attained at −54.55 dB. Most importantly, the EAB can attain 7.12 GHz (10.88–18.0 GHz) when the thickness is 2.38 mm, which is larger than that of the majority of MOF-derived composites. The superior MA performance is strongly related to excellent impedance matching and a higher attenuation constant. This study provides a simple strategy for synthesizing a MOF-derived Co/C composite with a wide EAB.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Abdul Haleem,Jun Chen,Xiao-Xiao Guo,Shi-Chang Hou,Sheng-Qi Chen,Muhammad Siddiq,Wei-Dong He
Herein, for the first time, macro-porous hydrophobic cryogels of poly( iso- decyl acrylate- co -ethylene glycol dimethacrylate) P(IDA- co -EGDMA) have been successfully fabricated through γ -ray radiation-induced cryo-polymerization. This synthesis route is highly advantageous over the reported redox and UV-radiation routes for the synthesis of hydrophobic cryogels considering the high energy and the penetrating depth of γ -ray, which favours the fabrication of larger cryogels within shorter duration. The effects of radiation time, dose rate, amount of cross-linker, solvent type and solvent amount on the cryo-polymerization were studied in detail, which were based on the measurements of gel fraction and contact angle as well as the characterizations of Fourier transform infrared spectroscopy , thermal gravimetric analysis and scanning electron microscopic examination. The fabricated macro-porous cryogels were used as a sorbent for different organic solvents and oils. Using benzene as a common organic solvent, the absorption equilibrium was reached within only 60 s and the absorption capacity varied in the range of 16–20 g/g depending on the cryogel morphology and crosslinking density. As for the halogenated solvents, P(IDA- co -EGDMA) cryogels absorbed 25–29 g/g of chlorobenzene, bromobenzene, iodobenzene and tetrachloromethane. Those cryogels withstood high temperature (150 °C) deprived of any alteration in absorption capability and pore morphology. The cryogels reusability was also confirmed with keeping absorption capacity and cryogel mass up to 10 cycles.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 29
·8975-8981
·
IF 6.641
Lin Long,Erqi Yang,Xiaosi Qi,Ren Xie,Zhongchen Bai,Shuijie Qin,Wei Zhong
In order to obtain the excellent comprehensive properties of microwave absorbers (MAs), core@shell structured Co0.6Fe2.4O4@MoS2 nanocomposites were elaborately constructed and synthesized by a facile two-step hydrothermal method. Due to the independence of the two-step processes, the method could be applied to produce different categories of MoS2 based nanocomposites. The obtained results demonstrated that the as-prepared Co0.6Fe2.4O4@MoS2 nanocomposites exhibited superior electromagnetic wave absorption performances with very low minimum reflection loss (RLmin) value and broad absorption bandwidth at thin matching thicknesses. Impressively, the optimal RLmin value reached −79.9 dB at 11.2 GHz with a thickness of 2.73 mm, and an effective bandwidth of 5.96 GHz was observed with thicknesses of 2.34 and 2.98 mm. Taking into account their the low cost of production, high stability and controllability, the obtained results demonstrated that the Co0.6Fe2.4O4@MoS2 nanocomposites achieved in this study are very attractive candidates for new types of high performance MAs. Moreover, we believe that constructing core@shell structured MoS2-based nanocomposites is a reliable strategy to accelerate advancements of MAs.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Guangqing Zou,Heming Xu,Zhen Qi Liu,Xin Yu Qu,Guo Qiu Hou,Xue Lian Wang,Xiaolei Wang,Guimei Shi
In this work, distinct-morphological Co 3 O 4 /Nickel foams were prepared through a simple hydrothermal method and a subsequent heat treatment process. The morphology of Co 3 O 4 can be efficiently modulated from hexagonal nanosheets to nanobunches and urchin-like microspheres by manipulating the NH 4 F concentration. For the urchin-like Co 3 O 4 /Nickel foam composites, the minimum reflection loss (RL min ) value can reach −42.53 dB at a matching thickness of 2.7 mm. Theoretical analysis shows that the enhanced microwave absorption intensity is mainly originated from dielectric losses including significant interfacial polarization of the abundant interfaces, intrinsic dipoles of Co 3 O 4 and magnetic losses containing natural resonance and eddy current loss are favorable for the impedance matching. Simultaneously, multiple scattering occurring within the 3D Ni network skeleton are considered to promote the microwave absorption performance. Furthermore, a quadrilateral cone array of the resultant urchin-like Co 3 O 4 /Nickel foam composites has a RL min of −56.7 dB and an effective absorption bandwidth can achieve 9.44 GHz. This work could be beneficial for exploiting high-efficient magnetic-dielectric microwave absorption materials via the microstructural design.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2023
·
IF 5.8
Jie Huang,Xiao Tang,Ziqiong Yang,Jianqiu Chen,Kun Wang,Chengnan Shi,Zihan Liu,Ming Wu,Qian Du
Irinotecan (CPT-11) is used as a first or second-line chemotherapy drug for the treatment and management of colorectal cancers. In vitro studies have shown that 7-ethyl-10-hydroxycamptothecin (SN38), the active metabolite of CPT-11, displays promising anticancer efficacy. However, its poor aqueous solubility and hydrolytic degradation result in its lower oral bioavailability and impracticable clinical application. To overcome these limitations, a novel amphiphilic chitosan derivative, deoxycholic acid decorated N’-nonyl-trimethyl chitosan, was synthesized. Nano-micelles loaded with SN38 were subsequently prepared to enhance the bioavailability and anti-tumor efficacy of the drug through oral administration. The nano-micelles demonstrated improved dilution stability, enhanced greater mucosal adherence, significant P-gp efflux inhibition, and increased drug transport in the intestine by paracellular and transcellular pathways. Consequently, both the in vivo pharmacokinetic profile and therapeutic efficacy of SN38 against cancer were substantially improved via the micellar system . Thus, the developed polymeric micelles can potentially enhance the SN38 oral absorption for cancer therapy, offering prospective avenues for further exploration.
研究领域:
药剂学
·
肿瘤学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zijian Liao,Mingliang Ma,Zhouyu Tong,Yuxin Bi,Kwok L. Chung,Mingtao Qiao,Yong Ma,Aijie Ma,Guanglei Wu,Zongxuan Li,Yu Zhang
In this work, one-dimensional (1D) ZnFe 2 O 4 @carbon@MoS 2 /FeS 2 composites were synthesized by hydrothermal method , magnetic-field-induced distillation-precipitation polymerization and high-temperature carbonization . The structure, morphology, composition , magnetic performance and electromagnetic (EM) wave absorbing properties of the composites were systematically studied. The composites show strong microwave absorption (MA) capacity with a minimum reflection loss (RL min ) value of −52.5 dB at 13.2 GHz, and have an effective absorption frequency range of 10.10–15.08 GHz with a bandwidth of 4.98 GHz when the thickness is 2.23 mm. It is expected that as-synthesized 1D ZnFe 2 O 4 @carbon@MoS 2 /FeS 2 composites can be a promising EM wave absorption material.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）