POWDER TECHNOLOGY
·
2019
·
IF 3.413
Wei Zhang,Fengzhen Zhang,Liping Ma,Jie Yang,Jing Yang,Huaping Xiang
Barium sulfide has been widely accepted as a useful barium compound in many fields. To reduce the emission of CO 2 through tail gas during the current industrial production of barium sulfide by the black ash method, a new clean process for barium sulfide preparation by barite reduction using elemental sulfur is proposed. Herein, we report a study on the kinetics and thermodynamics of the thermal decomposition of barium sulfate by elemental sulfur . The mechanism of this complicated gas–solid reaction was investigated under non-isothermal conditions, at different heating rates. Four isoconversional methods were used to determine the activation energy . The mechanism model of the barium sulfate decomposition was confirmed using the double equal–double step method. The results suggested that the barium sulfate decomposition followed the Jander D3 spherical symmetry model; the order of the reaction ( n = 1.06) was determined using the Carne equation.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2025
·Vol. 12
·期 23
·7706-7715
·
IF 6.4
Jingdong Yan,Xiangran Kong,Shichao Cheng,Tao Liu,Hongwei Leng,Yunfei Shang,Zuotao Lei,Chunhui Yang
Birefringent crystals, capable of modulating the polarization state of light, play a critical role in laser technologies such as communication and quantum optics. Despite remarkable progress in commercial birefringent crystals across the ultraviolet to near-infrared spectrum, the design of novel mid- and far-IR (MFIR) birefringent crystals faces fundamental challenges from inherent infrared absorption and poor optical anisotropy in these wavelength ranges. To address this, the first compound Ba2La2Sb4S10(S2) in the Ba–La–Sb–S system was successfully synthesized, driven by the stereochemically active lone pair (SCALP) effect. Ba2La2Sb4S10(S2) has a medium band gap (1.86 eV) and exhibits large birefringence (0.53 at 1064 nm). IR and Raman spectra confirm its broad transmission range (1–14 μm) with negligible absorption, demonstrating its suitability for MFIR optical devices. Furthermore, detailed analysis of the structure–property relationship, derived from first-principles calculations, reveals that the strong SCALP effect of Sb3+ in the structure significantly enhances the birefringence. This study not only provides a highly promising MFIR birefringent crystal but also validates the effectiveness of the SCALP-driven design strategy in the design of high-performance infrared birefringent materials.
研究领域:
材料科学
·
光学
·
无机化学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Qiang Chu,Yiru Zhang,Wen Chen,Ruoyi Jia,Xin Yu,Yaxuan Wang,Yonglu Li,Yangyang Liu,Xiang Ye,Lushuang Yu,Xiaodong Zheng
Immunosuppression refers to the suppression of the immune response. The immune function of immunocompromised people is not enough to resist bacterial, viral, fungal and other infections, leading to a series of diseases. A large number of experimental data show that polysaccharide compounds are immune modulators, which can enhance the body immunity with little toxic. Meanwhile, it can reduce the side effects of commonly used immunosuppressants, such as cytotoxicity, decreased ability of the body to fight infection, and inhibition of the reproduction of bone marrow hematopoietic cells. It can be used as oral or injectable drugs. In this study, a purified polysaccharide was primarily extracted from the flowers of Apios americana Medik (AAM), which can improve the immunosuppression induced by cyclophosphamide (CTX). The immunoenhancement effect of AFP was evaluated by measuring the body weight, immune organ index, cytokine secretion and antibody generated levels of CTX-induced mice. Our results showed that AFP could significantly improve the above immune indexes, which indicated AFP could alleviate immunosuppression induced by CTX. The study provided a theoretical basis for the promotion, development and application of AAM as a newly introduced food material.
研究领域:
免疫学
·
药理学
·
植物学
·
实验医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2019
·
IF 4.153
Wei Zhang,Fengzhen Zhang,Liping Ma,Jie Yang,Jing Yang,Huaping Xiang
For the complex reactive crystallization system of barium carbonate in industrial processes, the crystal size distribution (CSD) is an important factor for high-quality products and determines the efficiency of many downstream operations. Therefore, CSD prediction based on the mechanism model of the reactive crystallization process of barium carbonate is investigated in this work. The dynamic variation of the whole CSD was reconstructed during the growth and nucleation processes of barium carbonate by solving the population balance equations (PBEs) using combination of the method of characteristics (MOCH) with the quadrature method of moments (QMOM). The parameters of crystal nucleation and size-dependent growth model are identified by capturing real-time laboratory experimental data with process analytical technologies (PATs). Meanwhile, the optimal operating conditions for barium carbonate reactive crystallization processes can be determined, and an optimization approach is used to obtain the target CSD at the end of a batch crystallization process. The computational process is evaluated by experimentations and found that experimental CSDs agree with the simulated values. For complicated reactive crystallization processes with supersaturation controlled, the operating conditions influencing the dynamics of this evolution of CSD can be determined for offline crystallization design and online prediction and control.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Ailijiang Abudurusuli,Kui Wu,Junjie Li,Alimujiang Yalikun,Zhihua Yang,Shilie Pan
A series of metal chalcogenides, LiBa2MIIIQ4 (MIII = Al, Ga, In; Q = S, Se), have been successfully obtained by the sealed-tube method. LiBa2MIIIQ4 undergoes a special structural transformation from the P21/m (LiBa2AlQ4 and LiBa2GaS4) to the P21/n (LiBa2InQ4) space group, which leads to disparities in electronic states, birefringence, and band gaps. Their structures feature the same zigzag [LiMIIIQ4]4– layers consisting of corner-shared LiQ4 and MIIIQ4 tetrahedra. The Ba atoms serve to bridge the [LiMIIIQ4]4– layers. The structural comparisons show that the radii of MIII and the coordination environments of the Ba atoms (BaQ7 vs BaQ8) cooperatively affect the structural transition from simple mirror m to diagonal glide n in LiBa2MIIIQ4. In addition, a statistical analysis uncovers that the MIII/Ba atomic ratio also plays an important role in regulating the structural transition in Ba- and MIII-based chalcogenides.
研究领域:
材料科学
·
化学
✓ 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）