JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Xin He,Rongfei Wei,Xiangling Tian,Jianrong Qiu,Mei Zhang,Qingguang Zeng,Junyan Liu
Te-Bi 2 Te 3 alloy thin film has grown on silicon dioxide substrate by thermal evaporation technique. The Bi 2 Te 3 rhombohedral structure enriched Te in the prepared thin film was identified by high solution transmission electron microscopy (HRTEM), X-Ray diffraction (XRD), Raman spectrum and X-ray photoelectron spectroscopy (XPS). Interestingly, the Te-Bi 2 Te 3 alloy thin film presents a changeover from saturable absorption (SA) to reverse saturable absorption (RSA) as continuously increasing the input intensity, which has been investigated using the open-aperture (OA) z-scan measurement under a femtosecond-pulsed laser at 800 nm. A high modulation depth of 48.3% and large saturation intensity of 24.1GW/cm 2 of the thin film were obtained. Moreover, a large nonlinear absorption coefficient β of ∼10 3 cm/GW is increased with the input intensity elevated. The research results demonstrate that the Te-Bi 2 Te 3 alloy thin film could be an emerging optical material for saturable absorber in Q-switched or mode-locking fiber lasers at low incident intensity while serve as optical limiter at high incident intensity.
研究领域:
材料科学
·
凝聚态物理
·
光学工程
·
纳米材料
·
光电子学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Dongshun Deng,Bao Gao,Chao Zhang,Xiuzhi Duan,Yanhong Cui,Jingheng Ning
Ammonia (NH 3 ) is not only a harmful gas to environmental problem, but also a fundamental raw material in chemical industry. The effective separation and recovery of NH 3 from exhaust gas at low cost still remains a challenge for a long time. In this study, a new strategy to construct protic deep eutectic solvents (DESs) by paring NH 4 SCN as hydrogen-bond acceptor with various hydrogen-bond donors [glycerol (G), ethylene glycol (EG), urea (U), acetamide (AT), and caprolactam (CL)] was proposed for efficient and reversible absorption of NH 3 . Results showed that all the DESs possessed exceptional NH 3 absorption capacity and high NH 3 /CO 2 selectivity. At 303 K and 0.10 MPa, the absorption capacity of NH 3 in NH 4 SCN-glycerol (2:3) is as high as 0.223 g NH 3 per g DES, which is much higher than all reported functional ILs and DESs up to date. The NH 3 saturated DES was easily regenerated and recycled 25 times with persistent absorption performance. The influences of DES composition, temperature, NH 3 partial pressure on NH 3 absorption performance were also explored in detail. The absorption mechanism was analyzed using NMR spectroscopy and quantum calculation. These protic NH 4 SCN-based DESs presented as promising absorbents for NH 3 because of their high absorption capacity and good reversibility.
研究领域:
环境化学
·
分离科学
·
绿色溶剂
·
气体吸收
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yilin Huang,Wenjian Wang,Xingwang Hou,Ke Ran,Dongxu He,Shuai Wang,Yuan Fang,Rui Zhao,Weidong Xue
With the development of technology, microwave absorption technology shows its important position. In this work, A simple salt-template method was used to prepare copper phthalocyanine as N-doped graphene intercalated with CuO (CuO/NC). And a method to controllably regulate the dielectric constant by varying the ratio of salt templates and sintering temperature was proposed. When the treatment temperature is 900 °C and the ratio of salt template to raw material is 100:1, The minimum reflection loss (RL min ) of CuO/NC composite can reach −42.05 dB and the effective absorption bandwidth can reach 6.88 GHz with a thickness of 2.1 mm and a raw material filling of only 2 %, covering the entire Ku band. And the superior performance of the material was confirmed by simulation of the monostatic radar cross section. This research provides a new research direction for the synthesis of lightweight broadband microwave absorbing materials.
研究领域:
材料科学
·
纳米科技
·
电磁功能材料
·
复合材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Bo Wang,Jinyu Wang,Yuan Chen,Zhiyong Xu,Wenbo Zhao
N-Benzyl-N-methyl-1-(methyl diphenyl silyl) methanamine (MPSA) with high thermal stability was synthesized for the absorption of SO 2 in the present work. The absorption capacity was measured at low partial pressures ranging from 0.002 to 0.016 bar and thermodynamic parameters, including enthalpy change (Δ H ) and entropy change (Δ S ) were calculated to analyze the absorption behavior. The desulphurization rates and absorption capacities at different temperatures and partial pressures were simulated based on thermodynamic parameters. An optimal absorption temperature T 1 that maximizes the absorption capacity, and an optimal desorption temperature T 2 that minimizes the desorption residual capacity and thermal desorption energy consumption were defined, and a function was proposed to calculate them. The kinetic behavior of the absorption was described using a pseudo-first-order model, and kinetic data at different temperatures and partial pressures were simulated based on a combination of kinetic and thermodynamic parameters. Ultimately, selectivity and cycles experiment showing MPSA has excellent CO 2 selectivity and thermal regeneration performance.
研究领域:
环境化学
·
气体分离
·
热力学
·
化学工程
·
功能材料
·
大气污染控制
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yu Zhou,Wenjun Zhou,Chunhua Ni,Shenggang Yan,Liangmin Yu,Xia Li
Precursors of a nickel-based metal–organic framework, denoted Ni-MOF, and the loofah plant were prepared by the microwave method, and “tree blossom” Ni/Nitrogen doped Carbon (NC)/ Carbon (C) composites were prepared by in situ pyrolysis under an argon atmosphere. During pyrolysis, the morphology, specific surface area, porous structure and electromagnetic parameters of the Ni/NC/C composites were adjusted by adjusting the pyrolysis temperature. The maximum reflection loss of the corresponding Ni/NC/C composites can reach −63.1 dB at 13.84 GHz and a thickness of 2 mm when the pyrolysis temperature was 650 ℃ and the filling amount was 16 wt%. And the effective absorption bandwidth was 35.44 GHz when the thickness was adjusted from 1 mm to 5.5 mm within the range of 2–40 GHz. Excellent performance comes from conduction loss, dipole and interface polarization, magnetic resonance, multiple electromagnetic reflections and scattering, and equilibrium impedance matching.
研究领域:
材料科学
·
纳米复合材料
·
电磁功能材料
·
能源材料
·
环境功能材料
✓ 已验证
DOI
高影响因子
SOLID STATE COMMUNICATIONS
·
2021
·
IF 1.804
Shaohui Su,Jiahao Yu,Xianguo Liu,Jieyi Yu
Magnetic-dielectric composites attract numerous attentions for good microwave absorption performances based on magnetic-dielectric loss mechanism and tunable electromagnetic parameters. Fe/carbon fibers are prepared through carbonization of Fe doped polyaniline nanotubes , in which Fe nanoparticles are embedded in carbon fibers. The introduction of Fe nanoparticles results in good electromagnetic impedance and proper quarter-wavelength cancellation induced, which ensure that microwave penetrate composites to the great extend and is consumed as much as possible, leading to enhanced microwave absorption performance. The minimal reflection loss of Fe/carbon fibers composites starts being less than −10 dB from 1.7 mm and is up to −44.09 dB at 6.62 GHz and 4.1 mm and the effective bandwidth reaches 6.0 GHz with 2.4 mm.
研究领域:
材料科学
·
电磁学
·
纳米复合材料
·
功能材料
·
微波工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Kai Wang,Guangzhen Li,Yanhong Li,Yuan Chen,Ling Zhang,Zhiying Zhu,Zhiyong Xu,Wenbo Zhao
In the present work, a kind of amine alkyl siloxane N -butyl-N-((1,1,3-trimethyl-3,3-diphenyldisiloxaneyl)methyl)butan-1-amine (BTDMBA) was synthesized and used to capture SO 2 . Its thermal decomposition temperature is 160℃, which is comparable with that of Ionic liquids (ILs), but its viscosity is only 125 mPa∙s at 25℃ after the absorption of SO 2 , which is much lower than that of ILs. The reaction mechanism is that BTDMBA reacted with SO 2 to form charge transfer complex BTDMBA∙SO 2 . The reaction enthalpy and entropy change are −83.95 kJ/mol and −240.48 J·mol −1 ·K −1 , respectively, which are more negative than that of ILs. By comparing the enthalpy and entropy change of amine alkyl siloxane and absorbents reported in literatures, an unexpected entropy enthalpy compensation phenomenon was discovered and the isokinetic temperature was found to be 371 K. Based on this phenomenon and the optimization objective function, it was also found that with the decrease of entropy change, the optimal absorption and desorption temperature difference increased initially and decreased afterwards. The maximum of entropy changes is −201 J·mol −1 ·K −1 for absorbent to achieve recycle absorption capacity 0.79 mol/mol under the condition of absorption pressure 0.002 bar and desorption pressure 1 bar.
研究领域:
物理化学
·
环境化学
·
分离科学
·
能源材料
·
工业气体净化
·
绿色化工
✓ 已验证
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2019
·
IF 1.354
Mei Wang,Na Rao,Yuqing Liu,Jiale Li,Qunpeng Cheng,Jianfen Li
TETA or TETA-AEP mixtures were used as an activator to enhance CO2 capture in the MDEA solution. The effect of amount and type of activators, and the viscosity of absorbents on CO2 capture were discussed. The results showed that the positive effect of TETA-AEP mixtures on CO2 capture in the MDEA solution was greater than that of TETA. The optimal absorbent was No. V, whose CO2 absorption capacity/desorption efficiency was 3.08 times/1.18 times of No. І. The viscosity had a little influence on CO2 absorption and an obvious effect on CO2 desorption.
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
MATERIALS LETTERS
·
2015
·
IF 2.489
Jingzhong Zhao,Weiqiang Xing,Yang Li,Kathy Lu
Oxygen-deficient anatase TiO 2 sheets with dominant (001) facets are becoming a hot research topic due to their promising high activity in heterogeneous reactions . In this work, a series of (001) facets dominated TiO 2 with distributed oxygen vacancies and Ti 3+ was prepared by a simple hydrothermal method with the TiB 2 as a precursor. The as-prepared powders were characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission Electron Microscope (TEM), X-ray photoelectron spectroscopy (XPS) and UV–visible diffuse reflectance spectroscopy (UV–vis). The results show that the particle size of as-prepared TiO 2 increases and its band gap narrows with the hydrothermal temperature increasing from 140 °C to 180 °C. Besides, oxygen vacancies and Ti 3+ are generated during the TiB 2 hydrolysis, which leads to new absorption spectrum in the visible light region. Photocatalytic test shows that sample prepared at 180 °C presents the highest degradation efficiency.
研究领域:
材料科学
·
光催化
·
纳米材料
·
表面化学
·
半导体材料
✓ 已验证
DOI
高影响因子
MOLECULAR PHARMACEUTICS
·
2019
·
IF 4.396
Yina Song,Yanan Shi,Liping Zhang,Haiyan Hu,Chunyan Zhang,Miaomiao Yin,Liuxiang Chu,Xiuju Yan,Mingyu Zhao,Xuemei Zhang,Hongjie Mu,Kaoxiang Sun
The oral absorption of exenatide, a drug for type 2 diabetes treatment, can be improved by using nanoparticles (NPs) for its delivery. To improve the mucus penetration and intestinal absorption of exenatide, we designed a block copolymer, CSKSSDYQC-dextran-poly(lactic-co-glycolic acid) (CSK-DEX-PLGA), and used it for the preparation of exenatide-loaded NPs. The functionalized exenatide-loaded NPs composed of CSK-DEX-PLGA were able to target intestinal epithelial cells and reduce the mucus-blocking effect of the intestine. Moreover, the CSK modification of DEX-PLGA was found to significantly promote the absorption efficiency of NPs in the small intestine based on in vitro ligation of the intestinal rings and an examination of different intestinal absorption sites. Compared to DEX-PLGA-NPs (DPs), the absorption of CSK-DEX-PLGA-NPs (CDPs) was increased in the villi, allowing the drug to act on gobletlike Caco-2 cells through clathrin-, caveolin-, and gap-mediated endocytosis. Furthermore, the enhanced transport ability of CDPs was observed in a study on Caco-2/HT-29-MTX cocultured cells. CDPs exhibited a prolonged hypoglycemic response with a relative bioavailability of 9.2% in diabetic rats after oral administration. In conclusion, CDPs can target small intestinal goblet cells and have a beneficial effect on the oral administration of macromolecular peptides as a nanometer-sized carrier.
研究领域:
药剂学
·
生物医学工程
·
糖尿病治疗
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiemin Han,Yifei Ma,Mei Wang,Zhaomin Tong,Jonghwan Suhr,Liantuan Xiao,Suotang Jia,Xuyuan Chen
Black coatings benefit from low reflectance or high light absorption are utilized in multifarious optical applications. Due to their unique three-dimensional nanostructure and π-band optical transitions, vertical graphene (VG) has drawn great attention to the field of black coatings. However, how the morphology of VGs affects reflectance has not been comprehensively disclosed yet. In addition, the morphology of the substrate for VG growth also affects the absorption properties. Here, we report a nano-and micro-engineered VG/Ni structure based on VG and laser-modified nickel foil, which possesses omnidirectional low reflectance of ∼0.25% over the visible range. A larger spacing of graphene nanowalls is more conducive to the formation of light traps and improves the absorption property. Besides, the surface of nickel substrate by laser irradiation presents a “cauliflower-like” microstructure, which further enhances light-trapping ability.
研究领域:
材料科学
·
光学工程
·
纳米技术
·
表面工程
·
功能涂层
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Guonan Cui,Yanchun Yang,Ruilan Chen,Chengjun Zhu
Cations substitutions are known to make much significant contribution on achieving the high-quality kesterite Cu 2 ZnSn(S,Se) 4 thin films . And the optimal ratios of Mn, Ni and Co substitutions are reported to be ~0.05, belong to the low doping to reduce their defect density , which looks like to some extent the effect of Na doping. In this study, learning the research experience of alkali metal doping, we introduced the extra trace Mn 2+ ion into the precursor solution without affecting the compositions of other elements (i.e. Cu, Zn, and Sn), and the effect of trace addition on properties of the absorber layer was also studied. It was discovered that crystalline, electrical properties, and hole carrier concentration of Cu 2 ZnSn(S,Se) 4 thin films increased with an increase of Mn incorporation, and the best doping ratio of Mn/(Cu + Zn + Sn) was considered to be 0.03. In addition, the effect of extra trace Mn-doping on the film thickness and elemental compositions of Cu 2 ZnSn(S,Se) 4 absorber layer were studied in detail.
研究领域:
材料科学
·
半导体物理
·
薄膜制备
·
光伏材料
·
固体化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）