JOURNAL OF SOLID STATE CHEMISTRY
·
2013
·
IF 2.04
Lingyun Dong,Shilie Pan,Hongping Wu,Xin Su,Hongwei Yu,Ying Wang,Zhaohui Chen,Zhenjun Huang,Zhihua Yang
A series of lead-containing halogen oxyborates, Pb 6 B 3 O 10 X ( X =F, Cl, Br), have been grown by high-temperature solution method and their crystal structures were determined by single-crystal X-ray diffraction. They are isostructural and crystallize in the space group Pbcm of the orthorhombic crystal system . The crystal structures are dominated by one-dimensional ∞ [(Pb 4 O)(BO 3 ) 3 ] “ Zig-Zag ”-chains, while the remaining Pb atoms and X ( X =F, Cl, Br) atoms are filled to balance the charge. Compared with the previously reported compound Pb 4 O(BO 3 ) 2 (the molecular formula Pb 4 O(BO 3 ) 2 can be regarded as Pb 6 B 3 O 10.5 ) with the space group Aba 2, the structures of Pb 6 B 3 O 10 X ( X =F, Cl, Br) are completely different from that of Pb 4 O(BO 3 ) 2 . IR spectroscopy , UV–vis-NIR diffuse reflectance spectroscopy , thermal analysis, and theoretical calculations were also performed on the reported materials.
研究领域:
材料科学
·
晶体学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 25
·e202104463
·
IF 5.02
Yue Liu,Yuxiang Wang,Haoran Cheng,Zheng Ma,Qian Li,Gang Wang,Daocheng Pan,Limin Wang,Jun Ming
Graphical A new soluble CsPbX 3 precursor to in-situ prepare luminescent CsPbX 3 nanocrystal film in the air readily was designed. The composition of the CsPbX 3 NCs films can be tuned by changing the solution precursors, allowing obtaining a high color purity and a narrow emission width. Inorganic cesium lead halide perovskite nanocrystals are candidates for lighting and display materials due to their outstanding optoelectronic properties. However, the dissolution issue of perovskite nanocrystals in polar solvents remains a challenge for practical applications. Herein, we present a newly designed one-step spin-coating strategy to prepare a novel multicolor-tunable CsPbX 3 (X=Cl, Br, I) nanocrystal film, where the CsPbX 3 precursor solution was formed by dissolving PbO, Cs 2 CO 3 , and CH 3 NH 3 X into the ionic liquid n-butylammonium butyrate. The as-designed CsPbX 3 nanocrystal films show high color purity with a narrow emission width. Also, the blue CsPb(Cl/Br) 3 film demonstrates an absolute photoluminescence quantum yields (PLQY) of 15.6 %, which is higher than 11.7 % of green CsPbBr 3 and 8.3 % of red CsPb(Br/I) 3 film. This study develops an effective approach to preparing CsPbX 3 nanocrystal thin films, opening a new avenue to design perovskite nanocrystals-based devices for lighting and display applications.
研究领域:
材料科学
·
纳米技术
·
光电
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xin Lei,Yu Lei,Shuangshuang Cheng,Xin Yang
N -nitrosamines are great concern in potable water reuse. This study investigated the reaction kinetics of chlorine radicals (Cl • and Cl 2 •− ) with N -nitrosamines. The second-order reaction rate constants of Cl • ( k Cl • ) and Cl 2 •− ( k Cl2 •− ) with eight N -nitrosamines at pH 7.0 varied in the range of (5.02 ± 0.41)–(57.1 ± 4.25) × 10 8 M −1 s −1 and (0.46 ± 0.04)–(10.6 ± 0.73) × 10 8 M −1 s −1 , respectively. The numbers of methylene groups (#−CH 2 −) showed a good positive correlation with k Cl • (R 2 = 0.71), but not with k Cl2 •− . The degradation of eight N -nitrosamines under UV/chlorine advanced oxidation process (AOP) slightly increased by 1–18% in contrast to UV irradiation alone, and Cl − in the AOPs cannot inhibit their removal. The results improved the understanding of the fate of N -nitrosamines in chlorine radical-involved AOPs.
研究领域:
环境化学
·
水处理
·
高级氧化过程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Jianwu Lu,Yinfei Shi,Xiaoxia Ye,Shun Yuan,Xiaolong Yang,Xun Sun,Taizhi Wu
The primary limitations of the quantitative analysis of thermally labile halogenated compounds by traditional gas chromatography (GC) are the inadequacy of identifying the insufficiently volatile impurity (often with a high boiling point) and the difficulty in obtaining a standard substance with a reliable standardized assay. Taking the 4-(Chloromethyl)-5-methyl-1,3-dioxol-2-one (DMDO-Cl, 1) as an example, we reported a triphenylmethanamino-derivatization method to overcome the challenges of the assay determination of such species. During the quantification of 1, the presence of GC-undetectable polymeric impurity 10 poses a critical challenge in assessing the material quality. Moreover, the standard substance of 1 is not available on the market due to its inherent instability during storage and handling, further complicating the quantitative analysis. In this work, a precolumn HPLC-UV derivatization method based on triphenylmethanamino-alkylation was developed to quantitatively analyze 1. The resulting derivative 2 exhibits excellent crystallinity and superior physical and chemical stability and possesses effective chromophores for UV detection. The conversion from analyte 1 to derivative 2 demonstrates desirable reactivity and purity, facilitating quantitative analysis using the external standard method. The chemical derivatization-chromatographic detection method was optimized and validated, demonstrating its high specificity, good linearity, precision, accuracy, and stability. This method offers a valuable alternative to the general quantitative NMR (qNMR) detection technique, which exhibits reduced specificity in the presence of increased levels of impurities in compound 1.
研究领域:
分析化学
·
药物分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2011
·Vol. 399
·期 7
·2503-2509
·
IF 3.841
Chen Yang,Zhang Yanqin
Functionalization of the surfaces of silica particles is often the first step in their various applications. An improved heterogeneous Fmoc-Cl fluorescent assay using an aqueous solution was developed to detect the number of amino groups on solid-phase supports. The fluorescent Fmoc-Cl method is 50-fold more sensitive than the current UV assay using an organic solvent. This method, together with the homogeneous fluorescamine and OPA assays, is used to detect amino groups on the silica particle surface. The accuracy and effect factors of these methods were examined and the assays were optimized. The results showed that the amine groups on silica particles can produce stronger fluorescence than small amine molecules in solution, because the porous structure of the particle surface is a more hydrophobic environment. The number of active amino groups that can be conjugated with biomolecules is much less than the total number of amino groups on the silica particle. Compared with physical methods, chemical assays involving direct reaction with amino groups would furnish the closest result to the number of active amino groups on the particle surface.
Fluorescence emission of Fmoc-Cl in aqueous solution and linear correlation between intensity and concentration
研究领域:
纳米材料
·
分析化学
·
生物材料
·
表面科学
·
分子探针
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2019
·
IF 0
Shaohai Wu,Hengquan Yang,Zhengsen Wu,Chengyan Liu,Lei Miao,Jie Gao,Xiaoyang Wang,Xiuxia Wang,Chengjin Shen,Jacques G. Noudem,Jun Wang
Eco-friendly and low-cost layered SnSe2-based materials have been attracting great attention in the thermoelectric field for their intrinsically low thermal conductivity. In this work, we applied AgCl as Cl-dopant and formed Ag-rich precipitates in SnSe2 polycrystals, and their thermoelectric properties were investigated. The results demonstrate that Cl was artificially incorporated into SnSe2 by the substitution of Se atoms, playing as donor centers and thus increasing the carrier concentration by 2 orders of magnitude, leading to a tremendous improvement of the electrical conductivity and power factor. However, Ag atoms hardly enter into the Sn lattice sites and brought about the generation of Ag-rich precipitates. The complicated microstructures with multiple types of defects, such as point defects, boundaries, dislocations, and so on, result in a relatively low lattice thermal conductivity in the AgCl-introduced SnSe2 samples. Additionally, the anisotropic electrical and thermal transport properties were investigated, and the results show that higher ZT values were obtained along the pressing direction in these textured samples because of the significantly suppressed lattice thermal conductivity caused by the enhanced phonon scattering via the interior van der Waals layers. Ultimately, a maximum ZT value of 0.35 was realized at 400 °C in the polycrystalline SnSe2 with introduction of 11 mol % AgCl, which is nearly 3 times higher than that value of the pristine counterpart. It demonstrates that the combined effects of Cl-doping, Ag-rich precipitates, and texturing could effectively enhance the ZT value for polycrystalline SnSe2.
研究领域:
材料科学
·
热电学
·
固体物理学
✓ 已验证
产品关联
DOI
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2023
·Vol. 29
·期 2
·410-423
·
IF 2.7
Guifang Du,Zhaogang Liu,Peijie Jia,Jinsheng Duan,Ruifeng Ma,Yonggang Liu,Fushan Feng,Yanhong Hu,Jinxiu Wu
In this research, ZnAlLa-itaconate-LDHs was synthesized by means of Co-precipitation-hydrothermal method. The effects of aluminum-lanthanum ratio, co-precipitation time, hydrothermal time, and hydrothermal temperature on the crystal structure were studied. As a result, the optimum condition was found to be: n(Al 3+ ): n(La 3+ ) = 10:1, co-precipitation time 24 h, hydrothermal time 8 h, and hydrothermal temperature 180°C. The influence of ZnAlLa-itaconate-LDHs on the thermal stability properties and plasticizing properties of PVC were investigated, exhibiting long-term stability of 76 min with short plasticizing time of 1.11 min. Long-term thermal stability mechanism was studied by FTIR before and after hydrochloric acid treatment. It was demonstrated that the thermal stabilizer ZnAlLa-itaconate-LDHs prevented the rupture of the C Cl bond in PVC and inhibited the development of HCl. Consequently, impeded the production of CC bond and playing a role in thermal stabilization of PVC.
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
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2023
·Vol. 48
·期 8
·e202300047
·
IF 1.8
Kai Han,Zhanxiong Xie,Lingyu Deng,Shijiao Li,Chenyang Li,Yi Liu,Chongwei An,Jingyu Wang
In order to solve the short stabilization time of the water-in-oil emulsion binder system and the shortcomings of the critical blast size of the explosive ink molding sample, a water-in-oil emulsion binder was designed with polyvinyl alcohol (PVA) aqueous solution as the aqueous phase, fluorocarbon resin (FEVE) ethyl acetate solution as the oil phase, and toluene diisocyanate (TDI) added to modify the water-in-oil emulsion binder. The hexanitrohexaazaisowurtzitane(CL-20)based explosive ink was made by incorporating submicron CL-20 into the binder system, and the print-formed samples were tested for microscopic morphology, crystallographic analysis, mechanical susceptibility, and detonation transmission performance. The results showed that the explosive ink‘s viscosity was moderate and suitable for direct printing, and the formed sample‘s surface particles were uniformly dispersed and had a honeycomb structure. The crystal form of CL-20 explosive in the explosive ink did not change, the molded sample‘s impact and frictional sensitivities were 1 J and 32 N lower than those of submicron CL-20, respectively, and the detonation velocity of the molded sample was 6655 m/s. The critical detonation size and critical detonation thickness were 1×0.0078 mm and 0.1 mm, respectively, and a critical detonation corner turning of 90°–160° could be achieved. The results show that the prepared binder system is stable for a long time, and the explosive ink molding samples have excellent blast transmission performance.
研究领域:
化学工程
·
材料科学
·
爆炸力学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Min Deng,Jing Wei,Zikang Qin,Zheng Yan,Junfeng Zheng,Lin Yang,Lu Yao,Wenju Jiang,Zhongde Dai
Styrene-butadiene-styrene triblock copolymer (SBS) has attracted increasing research attention due to its low cost, excellent mechanical properties, and superior gas permeability performance. In this work, a series of novel SBS doped membranes were prepared by introducing polyphosphoric acid (PPA), lithium 2,2,2- trifluoroacetate (TFALi), and 1,3-dichloro-1,1,3,3-tetraisopropyldisiloxane (Siloxane-Cl) into SBS as dopants. The results indicated that the addition of dopants into SBS membranes simultaneously enhanced the CO 2 permeability and CO 2 /N 2 selectivity of SBS membranes. Specially, doping Siloxane-Cl expanded the d-spacing, introduced flexible siloxane (Si-O) groups to enlarge molecular spaces, and formed more crosslinked network structure. Therefore, the SBS/Siloxane-20 membrane showed an approximately 4-fold increase CO 2 permeability compared to the pristine SBS membranes (from 203.3 to 842.9 barrer), accompanied by an increase in CO 2 /N 2 selectivity from 15.8 to 22.0. The obtained membranes also exhibited attractive anti-plasticization and anti-physical aging properties, no obvious decline in CO 2 permeability and/or CO 2 /N 2 selectivity can be observed after 1-week continuous permeation test, making them promising candidates for CO 2 /N 2 separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Science China-Chemistry
·
2022
·Vol. 66
·期 1
·185-194
·
IF 10.138
Li Yong,Zhang Qian,Liu Lidan,Wang Dapeng,Liu Zhike,Yuan Ningyi,Ding Jianning,Wang Qiang,Liu Shengzhong (Frank)
The additive strategy has emerged as an effective approach to improving the performance of perovskite solar cells (PSCs). Herein, a small acceptor-donor-acceptor type molecule indaceno[1,2-b:5,6-b′]dithiophene chloride (IDT-Cl) is designed and synthesized to advance both the efficiency and stability of FA 0.85 MA 0.15 PbI 3 PSCs. Within the IDT-Cl molecule, the S-group with high electron density promotes chemical bonding with the lead cations in the perovskite, resulting in enlarged grain size and smoother surface topography of the perovskite absorber. In addition, the undercoordinated lead ions in the perovskite layer may be passivated by the carbonyl group in the 5-chloroindolin-2-one unit, thereby reducing the number of nonradiative recombination centers. Meanwhile, the IDT-Cl adjusts the energy level mismatch between the perovskite and two adjacent carrier transport layers, leading to easy charge collection. By the multifunctional effect of the IDT-Cl molecule, the modified device yields a high power conversion efficiency (PCE) of 24.46%, 8.8% higher than that of the control PSC (22.48%). More importantly, the hydrophobic alkyl side-chain of the IDT-Cl molecule further ensures enhanced humidity stability of the perovskite film and environmental, thermal, and light stabilities of the PSC devices.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 12
·125601
·
IF 2.9
Xia Pu,Wanling Cai,Huayao Chen,Fujie Yang,Xiaomei Mu
The key step in preparing mesoporous silica is to remove the organic template agent, and the most common method used to achieve this goal is high-temperature calcination. However, this method has many disadvantages, one of which is that it reduces the silanol density on the surface of mesoporous silica, which affects its subsequent modification. Ionic liquids (ILs) are often used as extractants. In this work, the 1-butyl-3-methylimidazolium chloride ([C4mim]Cl) IL is considered, and the effects of its concentration, reaction temperature, and reaction time as well as HCl concentration on the extraction rate and silanol density were investigated using an IL extraction template agent (cetyl trimethyl ammonium bromide (CTAB)). The results show that an IL concentration of 10%, a reaction temperature of 120 °C, a reaction time of 12 h, and an HCl concentration of 1% are the best reaction parameters; with these parameters, the extraction rate and the silanol density were found to be 93.19% and 2.23%, respectively. The silanol density of mesoporous silica treated by calcination is only 0.81%. A higher silanol density provides more reaction sites, so that the modified mesoporous silica treated with the IL can be loaded with more Zn ions.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2025
·
IF 13.1
Yanxuan Ma,Shuaifei Wang,Meiyu Li,Gongbin Wang,Jiatong Liu,Yuhua Gao,Peng Wang,Zhipeng Zhang
The performance of microcapsules in terms of “chloride response” and their electrochemical remediation mechanism is investigated. Electrochemical testing methods are used, i.e., kinetic potential polarization and electrochemical impedance testing. The variation rules of corrosion behavior of self-healing cementitious composites with different contents of microcapsules, both intact and pre-damaged, were investigated in a chloride ion environment. Based on this, the equivalent circuit change model is established. By fitting the parameters of the circuit elements, the change rule of the fitted parameters of the circuit elements is derived. To analyze the internal changes of self-healing cementitious composites in the corrosion process, and to reveal the self-healing mechanism of self-healing cementitious composites on the protective effect of its internal steel reinforcement. It was shown that the corrosion current density could be reduced as low as 0.87 μA/cm 2 for the intact samples immersed for 3 days and as low as 1.95 μA/cm 2 for damaged samples. The self-healing cementitious composites remained protective of the internal reinforcement after 56 days of immersion; Studies on the electrochemical self-healing mechanism have shown that microcapsules improve corrosion protection based on increasing the electrical resistivity of cementitious composites. The addition of 9 wt% microcapsules provided up to 39.16 % restoration efficiency at 56 days of immersion, and the restoration efficiency increased to up to 55.62 % in response to the combination of cracks and chloride ions. The microcapsules act together through mechanical and chloride ion response to retard the corrosion rate of steel reinforcement inside the self-healing cementitious composite by protecting the reinforcement passivation film.
研究领域:
土木工程
·
材料科学
✓ 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）