PHYSICA B-CONDENSED MATTER
·
2019
·
IF 1.874
Qi-Fang Ren,Bo Zhang,Shao-Hua Chen,Su-Lei Wang,Qian Zheng,Yi Ding,Hai-Sheng Qian,Zhen Jin
The Eu 3+ doped YVO 4 nanocrystallines with various morphologies were successfully synthesized by an amines (TETA, ETA and EDA) assisted hydrothermal process. By rationally adjusting the adding amount of TETA, ETA and EDA, the trepang-like, globular-like and pineapple-like Eu 3+ doped YVO 4 nanostructures can be conventionally obtained. The as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The XRD patterns indicate that these samples are all of the tetragonal structure. The SEM and TEM results show that the amines additives play an important role in morphology formation. Furthermore, the fluorescence properties of those samples are also systematically studied. Under the excitation of 280 nm, Eu 3+ doped YVO 4 : nanostructures emit strong red fluorescence due to the transitions of 5 D 1 - 7 F 1 and 5 D 0 - 7 F J (J = 1, 2, 3 and 4) of Eu 3+ ions. The intensity of red fluorescence is related to not only the concentrations of Eu 3+ , but also the types of adding amines. The effective luminescence lifetimes of the trepang-like Y 0.9 Eu 0.1 VO 4 nanocrystallines, the globular-lik and pineapple-like Y 0.95 Eu 0.05 VO 4 nanocrystallines are 0.91 ms, 1.02 ms and 1.14 ms, respectively. It is believed that this study is beneficial to promote the development of color display industry.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Xian-Rui Zhang,Yong-Yan Su,Xiao-Han Zhang,Xi Liu,Lei Gao
This study focuses on significantly enhancing the water solubility of mefenamic acid (MFA) through an innovative pharmaceutical amine salt strategy. By analyzing the crystal structure of MFA single crystals, we found that the dimer structure formed through carboxylic acid O H⋯O hydrogen bonding between MFA molecules limits the exposure of its hydrophilic groups, which is a crucial factor contributing to its poor water solubility. To overcome this limitation, we meticulously synthesized three forms of MFA amine salts: MFA-DIP salt, MFA-DIPA salt, and MFA-HDA salt. Utilizing various technical approaches, including crystal structure analysis, Hirshfeld surface analysis, powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC), infrared spectroscopy (IR), and fluorescence spectroscopy, we systematically investigated the structural characteristics and physicochemical properties of these amine salts. The results demonstrate that the hydrogen bonding interactions between MFA molecules are significantly enhanced upon salt formation, leading to favorable changes in the crystal structure and effective release of the previously restricted hydrophilic carboxylic acid groups, thereby significantly improving the water solubility of MFA. Notably, the solubility and dissolution rates of MFA-DIPA salt and MFA-HDA salt in water and pH 6.86 phosphate buffer solution were substantially increased. However, MFA-DIP salt exhibited salt decomposition during solubility testing, identified as a metastable crystalline form. This study not only provides practical strategies for improving the water solubility of MFA but also opens new perspectives for in-depth research on drug polymorphism stability and solubility optimization, offering potentially significant guidance for the field of pharmaceutical research and development.
研究领域:
药学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·12836-12847
·
IF 3.553
Zhu Zongmin,Lin Panlong,Wang Hao,Wang Luoxin,Yu Bin,Yang Feihua
Abstract In order to improve the flame retardancy and smoke suppression of epoxy resin (EP) simultaneously, we synthesized a melamine phenylhypophosphonate named as MABP via a simple one-step method and used it to modify EP materials. As expected, the addition of MABP not only largely improved the flame retardancy but also restrained the smoke release of EP. For details, when the content of MABP was 10 wt%, the EP composite possessed a limiting oxygen index value of 33% and achieved to a UL-94 V-0 rating as well as its PHRR, THR and TSP values decreased by 55.1%, 27.1% and 60% compared with that of neat EP, respectively. In addition, the flame-retardant mechanism was investigated by multiple instruments, and the corresponding results exhibited that the MABP could improve the compactness of char layer in condense phase and exerted fire-inhibition effect in gaseous phase. Graphic abstract
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 MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Xuejuan Yang,Yanhong Zhu,Xinlei Chen,Xingjun Gao,Shouwen Jin,Bin Liu,Li He,Bin Chen,Daqi Wang
Cocrystallization of the simplest bulky organic amine, tert‑butylamine (L), with a series of organic acids got a whole of 10 anhydrous salts with the compositions: tert‑butylammonium 2-(4-chlorophenoxy)-2-methylpropionate [(HL) + ·(cpmppa − ), cpmppa − =2-(4-chlorophenoxy)-2-methylpropionate] (1) , bis(tert‑butylammonium) dibenzoyl- l -tartarate [(HL + ) 2 ·(dbztat) 2− , (dbztat) 2- = dibenzoyl- l -tartarate] (2) , tert‑butylammonium pyrazinecarboxylate [(HL + )·(pyrca) − , pyrca = pyrazinecarboxylate] (3) , tert‑butylammonium 2-(4-chlorobenzoyl)benzoate [(HL + )·(cbzbz) − , cbzbz = 2-(4-chlorobenzoyl)benzoate] (4) , tert‑butylammonium 3-methylsalicylate [(HL + )·(3-msal) − , 3-msal = 3-methylsalicylate] (5) , tert‑butylammonium 4-methylsalicylate [(HL + )·(4-msal) − , 4-msal = 3-methylsalicylate] (6) , tert‑butylammonium 2‑chloro-4-nitrobenzoate [(HL + )·(cnba) − , cnba = 2‑chloro-4-nitrobenzoate] (7) , tert‑butylammonium 4‑bromo-3,5-dimethoxy benzoate [(HL + )·(bdmbza) − , bdmbza = 4‑bromo-3,5-dimethoxy benzoate] (8) , tert‑butylammonium 3,5-diiodosalicylate [(HL + )·(didsal) − , didsal = 3,5-diiodosalicylate] (9) and tert‑butylammonium 3,5,6-trichlorosalicylate [(HL + )·(tcsal) − , tcsal =3,5,6-trichlorosalicylate] (10) . The salts have been featured by XRD, IR and EA, the melting points were also gauged. Their structural and supramolecular aspects are analyzed in detail; all compounds are ionic with H-transferring to the tert‑butylamine. The result unveils that among the whole investigated crystals the NH 2 units in L are protonated when the acids are deprotonated and the crystal packing is interpreted via the strong charge-assisted N H⋯O H-bond from the NH 3 + and the CO 2 − . Apart from the N H⋯O H-bond, the O H···O H-bonds were also found at 5, 6, 9 and 10. 3, 9 and 10 had the additional N H⋯N, N H···I and N H···Cl H-bonds, respectively. Deep analysis of the crystal packing uncovered that a different set of additional O···O, Cl···Cl, Cl···O, Br···O, I···I, CH 3 ···C, CH 3 ···CH, CH 3 ···CH 3 , CH···O/CH 3 ···O, CH 3 ···Cl and CH 3 ···π contacts contribute to the stabilization and expansion of the total structures. For the synergism of the various nonbonding forces these structures had the homo/hetero supramolecular synthons. Some classical synthons of R 2 2 (8), R 4 2 (8), R 4 3 (10) and R 4 4 (12), commonly contained in solids of organic acids with amine, were present in these hydrogen bonding nets.
研究领域:
化学
·
晶体学
·
超分子化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2015
·
IF 2.002
Siwei Peng,Weijun Zhang,Jie He,Xiaofang Yang,Dongsheng Wang,Guisheng Zeng
Fenton oxidation is generally inhibited in the presence of a high concentration of chloride ions. This study investigated the feasibility of using benzoquinone (BQ) and hydroxylamine hydrochloride (HA) as Fenton enhancers for the removal of glycerin from saline water under ambient temperature by accelerating the ferric system. It was found that organics removal was not obviously affected by chloride ions of low concentration (less than 0.1 mol/L), while the mineralization rate was strongly inhibited in the presence of a large amount of chloride ions. In addition, ferric hydrolysis–precipitation was significantly alleviated in the presence of HA and BQ, and HA was more effective in reducing ferric ions into ferrous ions than HA, while the H 2 O 2 decomposition rate was higher in the BQ-Fenton system. Electron spin resonance analysis revealed that OH production was reduced in high salinity conditions, while it was enhanced after the addition of HA and BQ (especially HA). This study provided a possible solution to control and alleviate the inhibitory effect of chloride ions on the Fenton process for organics removal.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2021
·Vol. 29
·期 3
·446-454
·
IF 2.232
Liu Wenbiao,Huang Wenxuan,Rao Feng,Zhu Zhanglei,Zheng Yongming,Wen Shuming
Reverse flotation desilication is an indispensable step for obtaining high-grade fluorapatite. In this work, dodecyltrimethylammonium bromide (DTAB) is recommended as an efficient collector for the reverse flotation separation of quartz from fluorapatite. Its collectivity for quartz and selectivity for fluorapatite were also compared with figures corresponding to the conventional collector dodecylamine hydrochloride (DAC) via microflotation experiments. The adsorption behaviors of DTAB and DAC on minerals were systematically investigated with surface chemical analyses, such as contact angle determination, zeta potential detection, and adsorption density measurement. The results revealed that compared to DAC, DTAB displayed a similar and strong collectivity for quartz, and it showed a better selectivity (or worse collectivity) for fluorapatite, resulting in a high-efficiency separation of the two minerals. The surface chemical analysis results showed that the adsorption ability of DTAB on the quartz surface was as strong as that of DAC, whereas the adsorption amount of DTAB on the fluorapatite surface was much lower than that of DAC, which is associated with the flotation performance. During the floatation separation of the actual ore, 8wt% fluorapatite with a higher grade can be obtained using DTAB in contrast to DAC. Therefore, DTAB is a promising collector for the high-efficiency purification and sustainable utilization of valuable fluorapatite recourses.
研究领域:
矿物加工工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC PROCESS RESEARCH & DEVELOPMENT
·
2019
·
IF 3.327
Xin-peng Ma,Jin-sha Chen,Xiao-hua Du
Hymexazol is an efficient and low-toxicity soil fungicide. In this work, a fully continuous flow process for the synthesis of hymexazol has been developed. This process begins with combining ethyl acetoacetate and hydroxylamine hydrochloride to form a hydroxamic acid intermediate. The reaction solution is then quenched with concentrated hydrochloric acid to obtain the final product, hymexazol. Under the optimized process conditions, the total yield of the target product reached 86%. In addition, production was successfully scaled-up to a kilogram scale. The continuous flow method not only greatly decreases the reaction time but also significantly inhibits the side reactions.
研究领域:
化学工程
·
农药科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xueni Shang,Chunlei Chen,Fanbin Meng,Zuolin Zhang,Mengjia Li,Deyu Gao,Cong Chen
The grain boundary defects of polycrystalline perovskite could induce severe carrier recombination loss to restrict the photovoltaic and stability advancement of perovskite-based solar cells (PSCs). Inserting fixed molar ratio organic cations spacers into halide perovskite slabs to reduce the dimension of the crystal structure is still limited in finding a compromise of efficiency and stability for the widened bandgap and increasing barriers for carrier transport. Here, we select a direct additive bridging engineering to introduce a rationally designed organic amine salt 1,4-Benzene diammonium iodide (BDAI 2 ) with ammonium group on both terminals of the benzene ring to passivate the grain boundary and interface defects of perovskite . Bridging diammonium could ameliorate the interface contact and achieve electrostatic interactions with negatively charged traps (such as uncoordinated I – , PbI 3 – , and methylammonium vacancies) to inhibit cation migration, reduce halogen ion vacancy, and then suppress trap-induced recombination in perovskite. As a result, the bridging diammonium could improve the power conversion efficiency (PCE) from 19.86% to 21.91%. This study highlights the importance of rational bridging diammonium for perovskite surface modification and passivation to boost photovoltaic performance and stability.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Jiangyao Wu,Yan Dong,Xueyun Yang,Cheng Yao
The preparation of N-doped carbon dots (N-CDs) was facile and efficient by the hydrothermal method , using diethylenetriamine (DETA) and citric acid (CA) as nitrogen source and carbon source, respectively. The fluorescence of N-CDs was effectively quenched by Fe 3+ . Upon addition of hydroxylamine hydrochloride (HH) to N-CDs/Fe 3+ complex dispersion, the fluorescence of N-CDs was significantly recovered. Therefore, we developed an “off-on” fluorescence assay for the detection of HH using N-CDs/Fe 3+ as a fluorescence probe. The fluorescence intensity showed linearity with the added HH concentration ranging from 0 to 100 μM with the detection limit of 0.246 μM (S/N = 3). The proposed N-CDs sensing showed high selectivity and sensitivity to detection HH in aqueous solution.
研究领域:
分析化学
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
PHYSICS AND CHEMISTRY OF LIQUIDS
·
2019
·
IF 1.526
Ping Zhang,Peng Peng,Bingbing Hou,Cuiping Zhai
The interactions of dopamine hydrochloride (DH) with urea were investigated by electrochemical cyclic voltammetry, density functional theory (DFT) and quantum theory of atoms in molecules (QTAIM) analysis. Changes of the oxidation/reduction peak potentials of DH in DH-urea-H2O systems indicated that the hydrogen bonds were formed between DH and urea. The DFT and QTAIM results confirmed that the hydrogen and oxygen atoms on phenolic hydroxyl groups, the hydrogen atoms on NH3+ and the aromatic ring of DH can form hydrogen bond with the oxygen and hydrogen atoms of urea. Moreover, the solution pH has an effect on the electrochemical behaviour of DH in the system.
研究领域:
电化学
·
理论化学
·
药物化学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2024
·
IF 2.4
Yang Xue,Liu Aimin,Zhang Xin,Guan Pingping,Liu Yubao,Huang Haitao,Shi Zhongning
Aluminum chloride and triethylamine hydrochloride were employed in the synthesis of an AlCl 3 -Et 3 NHCl electrolyte. An aluminum sheet was utilized as the anode for the electrodeposition of metallic aluminum onto a copper substrate. This study aimed to investigate the effects of deposition potential on the morphology of the aluminum coating, the deposition mechanism, and the changes in Al(III) complex ions during the electrodeposition process. The results indicated that a deposition potential of − 0.3 V (vs. Al) produced aluminum coatings that were uniformly dense and securely adhered to the substrate. When electrodeposition occurred at − 0.5 V (vs. Al), the substrate surface exhibited aluminum nanowires with an approximate diameter of 367 nm. XRD analysis indicated a more pronounced (200) preferred orientation in the aluminum layer deposited at more negative potentials. Raman spectroscopy analysis detected the presence of AlCl 4 − and Al 2 Cl 7 − anions in the AlCl 3 -Et 3 NHCl system before electrodeposition, followed by the formation of Al 3 Cl 10 − complex ions in the system under potentiostatic control.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2022
·Vol. 51
·期 12
·1508-1521
·
IF 2
Wei Mengru,Wu Yuxing,Li Tiancheng,Zhang Ping,Liu Xuejun,Zhai Cuiping,Chen Xin
Cyclic voltammetry (CV), 1 H nuclear magnetic resonance ( 1 H NMR), density functional theory (DFT), quantum theory of atoms in molecules (QTAIM) and reduced density gradient (RDG) were used to study the interactions of dopamine hydrochloride (DH) with nicotinic acid (NAC) in aqueous solution. The results revealed that there existed three weak interactions in the DH–NAC system, C–H···π, π···π stacking and hydrogen bonds. These interactions showed different effects on the DH electrooxidation and its chemical environment. Moreover, the CV and 1 H NMR results indicated that C–H···π interaction between the H atoms on the benzene ring of DH and the pyridine ring of NAC, and π···π stacking between the benzene ring of DH and the pyridine ring of NAC are the main interactions in the system.
研究领域:
电化学
·
理论化学
·
生物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）