CRYSTENGCOMM
·
2024
·Vol. 26
·期 9
·1303-1311
·
IF 2.6
Shuyue Miao,Fangbao Jiao,Ying Wang,Qi Zhang,Suming Jing,Hongzhen Li,Xin Zhou
Compared with jagged and rod-like raw products, the spherulitic 3-nitro-1,2,4-triazol-5-one (NTO) crystalline powder is generally superior in the formulation. However, the growth mechanism and corresponding influential factors for NTO spherulites remain to be deeply explored. Herein, the morphological evolutions of NTO crystals in alcohol solvents under a range of maximum supersaturation (Smax) are systematically investigated. It was found that differences in solvent-crystal interface interactions determine the primary morphology of the growing crystals while the magnitude of Smax determines the subsequent polycrystalline evolution. The cooling rate, initial concentration and stirring rate all could affect the crystal morphology by changing the Smax. It is demonstrated that there exists a critical Smax range (1.75–1.88) above which the formation of spherulites is kinetically favorable. Face indexing tests suggest that the (0 0 1) plane of NTO is mostly prone to twinning at low supersaturation, which is because that the molecular layers on the (0 0 1) surface are prone to twisting and the energy difference before and after is only 8.77 kJ mol−1. Then, the interfacial growth theory is employed to explain how a growing crystal plane develops from smooth to rough with non-crystallographic sub-individuals as the crystallization driving force increases. The change of morphology has a positive consequence in improving the safety performance of NTO crystalline powder under drop-weight impact. These findings would forward the understanding of the spherulitic crystallization process for energetic crystals.
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产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2021
·
IF 4.952
Yu-Xi Liu,Yu-Ying Zhang,Jie Zheng,Jia-Nan Chen,Xu-Hui Huang,Xiu-Ping Dong,Bei-Wei Zhu,Lei Qin
Scallop is popular for its delicious taste and rich nutrition value. This study investigated the metabolomic changes in free amino acid (FAA), 5′-nucleotide, and lipid composition of scallops collected in different seasons. Results showed that the content of the FAA and 5′-nucleotide in summer was significantly higher than in other seasons. Adenosine 5′-monophosphate, glycine, and alanine were dominant from June to August. A total of 176 lipids, including 50 triacylglycerols (TAG), 60 phosphatidylcholines (PC), and 30 phosphatidylethanolamines (PE), were identified in the scallop adductor muscle. PC and PE were dominant from February to June, and TAG was dominant in November. The unsaturation degree of TAG was increased from July to November, and the highest proportion of polyunsaturated phospholipids appeared in August and September. Overall, scallops have high nutritional value in summer. This study is helpful for the development of scallop products with high nutrition and high value.
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高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2017
·
IF 3.887
Gang Pan,Ting-ting Jia,Qian-xia Huang,Yan-yan Qiu,Jie Xu,Pei-hao Yin,Tao Liu
Novel methods to improve the anticancer performance of 5-fluorouracil (5-FU) is quite necessary for clinical medicines. In the present work, we fabricated a novel type of mesoporous silica nanoparticles (MSNs)-based inorganic/organic hybrid nanoparticles covalently attached with poly(oligo(ethylene glycol) monomethyl ether methacrylate) (POEGMA) for improved stabilization and targeting peptide (RGD) for targeted delivery with the aim of improving the anticancer performance of 5-FU. Atom transfer radical polymerization (ATRP) initiator functionalized MSN (MSN-Br) was synthesized at first, which was followed by surface-initiated ATRP of water soluble OEGMA and carboxyl-containing monomer (2-succinyloxyethyl methacrylate, SEMA). Functionalization of RGD onto the hydrophilic P(OEGMA- co -SEMA) chains afforded the final hybrid nanoparticle, MSN-P(OEGMA- co -RGD). 5-FU can be effectively loaded into the meso -pores of MSN-P(OEGMA-c o -RGD) ( [email protected] ) with drug content ∼7.5 wt%. And the dynamic diameter ( D h ) and zeta potential (ζ) of [email protected] were determined to be 199.3 ± 5.4 nm and −8.7 ± 0.5 mV, respectively. It was demonstrated that MSN-P(OEGMA-c o -RGD) exhibited improved internalization into colon cancer cells and enhanced accumulation in tumor tissues. In addition, compared with free 5-FU, [email protected] showed enhanced anticancer efficacy both in vitro and in vivo, implying promising clinical applications.
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DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Yunchao Feng,Wenlong Jia,Guihua Yan,Xianhai Zeng,Jonathan Sperry,Binbin Xu,Yong Sun,Xing Tang,Tingzhou Lei,Lu Lin
Directly oxidative esterification of Biomass-derived 5-hydroxymethylfurfural (HMF) into dimethyl furan dicarboxylate (DMFDCA) is a promising route for the replacement of petroleum-derived commodity chemical terephthalic acid (TPA) extensively employed in polyester synthesis. Co-based N-doped carbon materials are one of the most promising applied catalysts for oxidative esterification reaction, however, the active sites and reaction pathway of these catalysts have not been clearly clarified, which is crucial to the practical application. Herein, we report that ZIF-67 (a zeolitic imidazolate framework (ZIF)-type cobalt-containing MOF) derived Co@C-N material is a highly effective catalyst for the selective conversion of HMF into DMFDCA in 95% yield. The high activity of the ZIF-67 derived nanocarbon composites Co@C-N can be attributed to the electron transfer between nitrogen-doped carbon shells and Co nanoparticles. The appropriate graphitic N and pyridinic N doping increases the electronic mobility and active sites. Density functional theory (DFT) simulations indicated that oxygen, HMF and methanol molecules are adsorbed and activated on C-N materials. Furthermore, no 2, 5-diformylfuran (DFF) was captured as an intermediate because the oxidative esterification of aldehyde preferentially occurred than the oxidation of hydroxyl group in HMF. We anticipate that these results can drive progress in the bio-based polymers sector and oxidative esterification reaction.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 25
·11380-11389
·
IF 3.591
Rui Yang,Yifei Liu,Zhen Dong,Haiyan Li,Zhiwen Ye
As an environmentally friendly energetic group, the azide group can not only control the melting point but also increase the energy of the compound. Therefore, the design and synthesis of energetic compounds with azido groups have long been a focus of research in the field of energetic materials. 3-R-4-(5-methyleneazide-1,2,4-oxadiazol-3-yl)furazan energetic materials were synthesized and fully characterized. Using computational chemistry methods, the interactions of some compounds were studied, and the physical and chemical properties of all of compounds were examined. The results show that 3-amino-4-(5-methyleneazide-1,2,4-oxadiazol-3-yl)furazan (2) has a melting point similar to that of TNT and can be a potential carrier for molten-cast explosives. Hydroxylamine salt (4) has an excellent detonation velocity and detonation pressure of 9090 m s−1 and 35.76 GPa, respectively, and its energy is significantly higher than that of RDX, enabling replacement of RDX as a high-energy explosive. Although the detonation performance of compound 4 is slightly lower than that of HMX, its sensitivity is better than that of HMX, which shows that compound 4 still has a high application value. Non-covalent interactions (NCIs) and Hirshfeld surface models indicate that hydrogen bonding and π–π interactions are the key factors that reduce the sensitivity of compounds. Therefore, our results for 3-R-4-(5-methyleneazide-1,2,4-oxadiazol-3-yl)furazan energetic materials suggest that it may be competitive for application in both molten-cast explosives and high-energy explosives.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2018
·Vol. 25
·期 1
·1-9
·
IF 1.434
Li Hanyuan,Wang Wei,Chen Guofei,Liu Yinfeng,Fang Xingzhong
Novel highly soluble phenylethynyl-endcapped oligoimides derived from mixed thioetherdiphthalic anhydride isomers ( m -TDPA) and 5(6)-amino-1-(4-aminophenyl)-1,3,3-trimethylindane (DAPI), 4,4′-oxydianiline (4,4’-ODA) with 4-phenylethynylphthalic anhydride (PEPA) as a reactive endcapping agent were synthesized. The calculated molecular weights of all the oligoimides were 2500 g·mol −1 .The effect of the mole ratio of DAPI/4,4’-ODA on solubility and melt viscosity of oligoimides as well as the thermal and mechanical properties of cured polyimide films was investigated. Experimental results indicated that DAPI greatly improved the solubility (>30 wt.%) of the oligoimides in low boiling points solvents when the content of DAPI was more than 10 mol% per total diamine. All the oligoimides exhibited very good processability with minimum melt viscosity lower than 60 Pa·s at about 330 °C. Tough and brown films were obtained after thermally cured at 370 °C for 1 h and dynamic mechanical analysis (DMA) showed that glass transition temperatures of the cured films increased up to 340 °C with the increasing content of DAPI. However, the thermal stability and mechanical properties decreased with the increase of DAPI content. The temperature of 5% weight loss was higher than 470 °C in both air and N 2 atmosphere obtained by thermogravimetric analysis (TGA). And the tensile strengths of the cured films were about 60 MPa.
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高影响因子
Surfaces and Interfaces
·
2022
·
IF 6.137
Shouxing He,Yaoguo Huang,Chengwang Wang,Ming Wang,Yali Zhang
In order to improve the separation efficiency of copper and lead minerals, reduce the use of inhibitors, and further break the design bottleneck of the flotation collector, a novel compound with a di-minerophilic group was designed as a collector used for separating copper and lead minerals. In this study, novel oxadiazole-thione surfactants with or without a di-minerophilic group, including 5-methyl isobutylxanthate-1,3,4-oxadiazole-2-thione (MIXODT) and 5-heptyl-1,3,4-oxadiazole-2-thione (HpODT), were synthesized and introduced initially as collectors in flotation separation of chalcopyrite from galena. Micro-flotation indicated that MIXODT exhibited improved flotation ability and selectivity for chalcopyrite than HpODT. Meanwhile, DFT calculations also showed that the reactivity of MIXODT was higher than HpODT. The MIXODT's better selective adsorption behavior was characterized by wettability measurements, ζ-potential and UV spectra. The results of adsorption thermodynamic and kinetic experiments confirmed that MIXODT adsorption on chalcopyrite was an endothermic-spontaneous chemisorption process, with Δ H (change of enthalpy), Δ S (change of entropy), Δ G (change of free energy) and E a (activation energy) values of 59.74 kJ·mol −1 , 274.70 J·mol −1 ·K −1 , -23.02 kJ·mol −1 and 58.68 kJ·mol −1 , respectively. The electrochemical behavior of the chalcopyrite surface showed that a dense adsorption layer was formed on the chalcopyrite surface after MIXODT treatment.
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高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 9
·e202203332
·
IF 2.1
Cunwei Qian,Ying Wang,Xian Li,Changsheng Yao
Graphical A convenient, rapid and electrochemical one-pot protocol is designed for the synthesis of pyrazolo[3,4- b ]quinolines derivatives. The reaction is carried out in an undivided cell equipped with an iron cathode and a graphite anode in the presence of sodium bromide as a supporting electrolyte. Fourteen pyrazolo[3,4- b ]quinoline derivatives are obtained under a constant current of 30 mA after 0.14 F/mol of electricity passed. A convenient, rapid and electrochemical one-pot protocol was developed successfully for the preparation of pyrazolo[3,4- b ]-quinoline derivatives. The reaction is carried out in a 25 mL three neck flask equipped with graphite electrode as anode and iron electrode as cathode (electrode area of 1 cm 2 ) with sodium bromide as supporting electrolyte at room temperature in ethanol. Fourteen pyrazolo-[3,4- b ]-quinoline derivatives were synthesized by use of various aldehyde (including aryl aldehydes and aliphatic aldehydes), dimedone and 5-amino-3-methyl-1-phenylpyrazole as substrates in good yields (76–86 %) with a constant current of 30 mA after 0.14 F/mol of electricity passed. All aimed products were characterized by IR, 1 H NMR and HRMS. Notably, the presented method features ecologically sound, simple experimental procedure and good yields.
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 325
·期 2
·673-682
·
IF 1.137
Liu Bing,Jia Yongzhong,Jing Yan,Zhang Quanyou,Shao Fei,Yao Ying
Abstract The lithium isotope separation (LIS) plays a vital role in development of nuclear industry. The liquid–liquid extraction technologies open up new possibilities for LIS. This work presents preliminary results of the study on the extractions and separation of 6 Li/ 7 Li by mixed system, comprising amino-derivatives of benzo-15-crown-5 (4AB), ionic liquid and anisole. 4AB was used as an extractant. The eparation factor ( α ) is 1.031 ± 0.001, and abundance of 6 Li in loaded organic phase is 7.76%. Meanwhile, the reason why 4AB has better separation efficiency than B15C5 was explored brief by Fourier transform infrared (FT-IR) spectrum and quantum chemical calculations. Graphic abstract
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高影响因子
Crystals
·
2020
·Vol. 10
·期 9
·781
·
IF 2.404
Qintong Huang,Rui Li,Guangying Fu,Jiuxing Jiang
ZSM-5 zeolites are commonly used as a heterogeneous catalyst for reactions. Four ZSM-5 catalysts (with various crystallite sizes and a similar ratio of Si/Al) and their ball-milling/surface-poisoning derivates were used to convert L-lactic acid to L, L-lactide. The reaction products were analyzed by three independent analytical methods (i.e., Proton nuclear magnetic resonance (1H NMR), high-pressure liquid chromatography (HPLC), and chiral gas chromatography (GC)) for determining the L, L-lactide yield and L-lactic acid conversion. A clear size effect, i.e., smaller catalysts providing better performance, was observed. Further ball-milling/surface-poisoning experiments suggested that the size effect of the ZSM-5 catalysts originated from the diffusion-controlled nature of the reaction under the investigated conditions.Keywords:ZSM-5 zeolites;L,L-lactide;size effect;diffusion control
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Lei Chen,Wenxia Zhuang,Jingmin Lan,Xiaoling Liu,Shi Jiang,Lei Wang,Yu Zhou,Jun Wang
Mg-bearing MTW silicalite zeolite, MgSi-ZSM-12, was straightforwardly synthesized by involving an unusual acidic pre-gelation system and engaged as the task-specific support for loading the Au nanoparticles (NPs). The resulting Au/MgSi-ZSM-12 catalyst showed stably excellent activity for the oxidation of HMF into FDCA in the presence of atmospheric dioxygen (O 2 ) without externally adding any liquid base, affording a yield of 87 % and turnover number (TON) of 331 based on the surface Au sites. Superior basicity was evidenced by embedding Mg species into the all-silica zeolitic skeleton, which enables strong, weak, and near-zero affinity towards aldehyde, alcohol, and carboxyl groups, respectively, thus, allows rapid and high-uptake adsorption of HMF, but negligible adsorption of FDCA. This unique feature of the Mg-bearing all-silica zeolite support together with its synergy with the active sites of Au NPs is revealed to accelerate the production of FDCA under the base-free mild condition.
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高影响因子
Inorganic and Nano-Metal Chemistry
·
2017
·
IF 0
Jiaxing Li,Meng Ni,Chaoyi Fan,Yan Li,Xiuqing Zhang
A new cobalt complex [Co3(SIP)2(4-PP)8(H2O)6]·4H2O·2(4-PP) (1) with 5-sulfoisophthalic acid sodium (NaH2SIP) and 4-phenyl pyridine (4-PP) as ligands has been synthesized in the mixed solvents of ethanol and water. It crystallized in monoclinic, space group P21/c, with a = 20.9642(9) Å, b = 15.6091(5) Å, c = 20.0126(8) Å, α = 90.00°, β = 115.493(6)°, γ = 90.00°, V = 5911.2(4) Å3, Z = 2, Dc = 1.346 g/cm−3, F(000) = 2494, the final GOOF = 1.038, Rint = 0.0258 and wR2 = 0.1793. The complex (1) was characterized by single-crystal X-ray diffraction, magnetic susceptibility and IR spectroscopy analyses. Single-crystal X-ray diffraction shows that complex (1) is trinuclear based on cobalt units. Magnetic susceptibility measurement indicates that complex (1) shows an antiferromagnetic coupling between the Co(II) ions.
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