MATERIALS AND MANUFACTURING PROCESSES
·
2025
·
IF 4.7
Binfeng Pan,Jie Liu,Zhimin Zhang,Xuchen Lu
The process for preparing high-purity anhydrous yttrium chloride was investigated using a complex salt containing an excess of yttrium oxychloride. By studying the conversion of yttrium oxychloride, it was determined that the key to preparing high-purity anhydrous yttrium chloride lay in the synergistic actions of gas-solid and solid-solid reactions. On this basis, a purity control strategy involving the adjustment of the height-diameter ratio of the sample was proposed to inhibit hydrolysis and enhance the conversion rate. By adopting the purity control strategy, high-purity anhydrous yttrium chloride with a yttrium oxychloride content below 0.1 wt.% was obtained at 600°C when the height-diameter ratio of the samples exceeded 1.42. Finally, the experiments on preparing Mg-Y alloys through molten salt electrolysis validated the impact of the YCl3 purity on the electrolysis process. When the high-purity anhydrous yttrium chloride obtained by this strategy was utilized, the current efficiency could reach 83.7%.
研究领域:
材料科学
·
冶金工程
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 48
·42643-42648
·
IF 3.289
Xiaosheng Du,Haibo Wang,Xu Cheng,Zongliang Du
A novel phase change material (PCM), namely, comb polyurethane with polyethylene oxide segments as side chains (DMPEG–PU), was synthesized through the reaction between diethanolamine-modified monomethoxy polyethylene glycol (MPEG) with isophorone diisocyanate and 1,4-butanediol. The crystalline property, phase change property, and thermal stability were characterized by differential scanning calorimetry (DSC), thermogravimetric analysis (TG), wide-angle X-ray diffraction (WAXD), scanning electronic microscopy (SEM), and polarization optical microscopy (POM). An accelerated thermal cycling test was then conducted to reveal the thermal reliability of the synthesized DMPEG–PU. The WAXD patterns and POM images showed that the synthesized DMPEG–PU possesses a completely crystalline structure and smaller spherulites compared with the pristine MPEG. The DSC results showed that DMPEG–PU (with 85% weight percentage of MPEG) is a typical solid–solid PCM with high thermal transition enthalpy of more than 120 J g−1, which is higher than the thermal transition enthalpy of polyethylene glycol-based polyurethane. TG results showed that the synthesized DMPEG–PU exhibits satisfactory thermal stability.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Somboon Chaemchuen,Xiaotong Hou,Zhonghan Cheng,Kui Zhou,Serge Zhuiykov,Francis Verpoort
A facile method was developed from solid precursors to obtain zinc anchored in a nitrogen-doped carbon matrix (Zn-NCx) via the solid–solid thermal (SST) route. The applied method, to synthesize Zn-NCx, was completed under single-step and solvent-free conditions. Regarding the synthesis mechanism, the zeolitic-imidazole framework (ZIF-8) was first fabricated from solid mixed precursors at a low temperature of the SST process. In a continuous mode, the fabricated ZIF-8 was sacrificed at a high temperature of the SST process to obtain Zn-NCx. Detailed characterization was performed to investigate the solid–solid transformation of precursors during the SST route. This characterization confirmed that Zn-NCx consists of zinc anchored in the nitrogen-doped carbon matrix. Also, due to the high porosity and N-functionalization, Zn-NCx exhibited excellent adsorption properties for CO2 and was helpful in CO2/CH4 separation. Furthermore, the chemical properties in hierarchical porous Zn-NCx were demonstrated to act as a catalyst for CO2 fixation. Interestingly, since the current method (SST) is solvent-free, this is a promising environmental route. The procedure has the potential for upscaling, revealing vast prospect for applications based on these carbon materials.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2014
·
IF 0.872
Shimin KANG,Jie CHANG,Juan FAN
A carbon-based sulfonated catalyst was prepared by direct sulfonation and carbonization (in moderate conditions: 200 °C, 12 h) of red liquor solids, a by-product of paper-making process. The prepared sulfonated catalyst (SC) had aromatic structure, composed of carbon enriched inner core, and oxygen-containing (SO 3 H, COOH, OH) groups enriched surface. The SO 3 H, COOH, OH groups amounted to 0.74 mmol·g −1 , 0.78 mmol·g −1 , 2.18 mmol·g −1 , respectively. The fresh SC showed much higher catalytic activity than that of the traditional solid acid catalysts (strong-acid 732 cation exchange resin, hydrogen type zeolite socony mobile-five (HZSM-5), sulfated zirconia) in esterification of oleic acid. SC was deactivated during the reactions, through the mechanisms of leaching of sulfonated species and formation of sulfonate esters. Two regeneration methods were developed, and the catalytic activity can be mostly regenerated by regeneration Method 1 and be fully regenerated by regeneration Method 2, respectively.
研究领域:
化学工程
·
催化科学
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 12
·1-11
·
IF 2.009
Zhang Farong,Shen Bowei,Jiang Wenxiu,Yuan Hui,Zhou Hong
Extraction of diosgenin from the rhizome of Dioscorea by catalytic hydrolysis over recyclable solid acids is one of the most enviromentally friendly ways for the conversion of biomass into chemicals. In this paper, a magnetic solid acid, Fe 3 O 4 @SiO 2 @NH-(CH 2 ) 2 -NH 2 @SO 3 H with the particle size of about 80 nm, was synthesized by using Fe 3 O 4 (~ 20 nm) as a magnetic core and then coated orderly with tetraethyl orthosilicate (TEOS) and N-{3-(Trimethoxysilyl) propyl} ethylenediamine (TMPED) by sol-gel reactions in water/ethanol solution, followed by the sulfonation of chlorosulfonic acid. The solid acid was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscope (SEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and X-ray photoelectron spectroscopy (XPS). The content of acidic sites on the surface of the solid acid was 1.01 mmol/g, measured by back titration method. The prepared solid acid was used to hydrolyze and extract diosgenin from Dioscorea nipponica Makino (DNM). The results show that the magnetic solid acid has higher hydrolysis activity than 2.5 M hydrochloric acid under same hydrolysis conditions, at 110 °C for 5 h. In addition, the magnetic solid acid can be easily separated from the reaction mixture by the application of a magnet and reused several times without significant activity loss. This work has a potential application value for the extraction of diosgenin from plants.
研究领域:
植物化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
FUEL
·
2018
·
IF 4.908
Zhong-Qiu Liu,Xian-Yong Wei,Fang-Jing Liu,Guang-Hui Liu,Zhi-Min Zong
Trifluoromethanesulfonic acid supported on attapulgite powder (TFMSA/AP) and Mg 2 Si/γ-Al 2 O 3 were facilely prepared by impregnating TFMSA onto AP and Mg 2 Si onto γ-Al 2 O 3 . The extraction residue from Yiwu lignite (YL ER ) was subjected to non-catalytic hydroconversion (NCHC) and catalytic hydroconversion (CHC) over TFMSA/AP and Mg 2 Si/γ-Al 2 O 3 , respectively. Detailed molecular compositions of the soluble portions from the NCHC (SP NCHC ) and CHC over TFMSA/AP (SP CHC-A ) and Mg 2 Si/γ-Al 2 O 3 (SP CHC-B ) were characterized with a gas chromatograph/mass spectrometer. As a result, the yields of SP CHC-A and SP CHC-B are 19.6% and 17.5%, respectively, which are much higher than that of SP NCHC (1.04%), suggesting that both TFMSA/AP and Mg 2 Si/γ-Al 2 O 3 show excellent activity for the CHC of YL ER . Arenes and arenols are predominant in SP CHC-A and SP CHC-B , respectively, while large amounts of alkanoates were detected in SP NCHC . The results indicate that TFMSA/AP effectively catalyzes the cleavage of C ar –C alk and C alk –O bridged bonds (BBs) in YL ER , while Mg 2 Si/γ-Al 2 O 3 significantly promotes the cleavage of C–O BBs in YL ER . Di(1-naphthyl)methane, 1-methylnaphthalene, oxydibenzene, and benzyloxybenzene were used as coal-related model compounds (CRMCs) for the CHC to further explore the catalysis of TFMSA/AP and Mg 2 Si/γ-Al 2 O 3 . The results show that TFMSA/AP not only releases mobile H + but also heterolytically splits H 2 to form an immobile H − and a mobile H + , leading to the cleavage of C alk –C ar and C alk –O BBs in the CRMCs. In contrast, Mg 2 Si/γ-Al 2 O 3 facilitates heterolytically splitting H 2 to an immobile H + and a mobile H − , resulting in the cleavage of C–O BBs in the CRMCs.
研究领域:
化学工程
·
煤炭化学
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DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2018
·
IF 1.54
Na Han,Wenxin Zhang,Xiufang Wang,Xingxiang Zhang,Wei Li,Wanyong Yu
It is a worldwide challenge to efficiently use renewable resources to solve the current energy shortage. The existing cellulose-based material is incapable of proper power storage. In this study, a series of cellulose benzoate-g-polyoxyethylene (2) hexadecyl ether (CB-g-E2C16) solid–solid phase change materials were synthesized with cellulose as the skeleton and polyoxyethylene (2) hexadecyl ether (E2C16) as a functional side chain. The skeleton cellulose and benzoyl chloride restrict the free movement of the molecular chains of E2C16 above the phase transition temperature, leading to a solid–solid phase change. Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy were performed to investigate the chemical structures. The thermal energy-storage properties, thermal reliability and thermal stability of the CB-g-E2C16 were investigated by differential scanning calorimetry and thermogravimetry (TG) methods. The analysis results indicated that the E2C16 chains were successfully grafted onto the cellulose benzoate (CB) backbone and the copolymers exhibited typical solid–solid phase transition behavior. The enthalpy and degree of substitution of graft copolymers CB-g-E2C16 could be adjusted by changing the feeding ratio of the raw materials, reaction temperature and post-processing methods of CB. TG analysis results showed that the CB-g-E2C16 copolymers possessed good thermostability and they keep their stability up to 278℃. Compared with pure cellulose, CB-g-E2C16 copolymers could be dissolved in dimethyl sulfoxide and most of them could be dissolved in N,N-dimethylformamide.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2025
·
IF 4.9
Jianshuo Su,Jie Xu,Shufan Liu,Laura Machin Galarza,Shuangfeng Li,Huaizhen Zhang,Zhuang Ding,Jun Han,Min Liu,Yanna Zhao
The efficacy of axitinib (Axi) for treating various cancers has been demonstrated clinically. However, the poor aqueous solubility of Axi limits its application. In this study, the solubility enhancement and recrystallization inhibition effect of different cellulose derivatives and surfactants were evaluated systematically. Ternary amorphous solid dispersions of Axi (Axi TSDs) were prepared with hypromellose succinate HF (HPMCAS HF) as a recrystallization inhibitor and polyoxyethylene hydrogenated castor oil as the wetting agent. Binary amorphous solid dispersions of Axi (Axi BSDs) were also prepared with mere HPMCAS HF for further comparative study. Distinct liquid−liquid phase separation state of Axi was revealed in the binary and ternary system. Differential scanning calorimetry and powder X-ray diffraction assays confirmed that the crystalline state of Axi had successfully transformed to an amorphous state in both Axi BSDs and Axi TSDs, with morphological validation provided by scanning electron microscopy. Energy dispersive spectrometer and Fourier transform infrared spectroscopy demonstrated homogeneous excipient distribution around Axi, mediated through physical molecular interaction. Axi TSDs exhibited superior dissolution profiles in different pH media and simulated gastrointestinal fluid compared to Axi BSDs and Axi bulk powder. Pharmacokinetic evaluation in rats of Axi TSDs revealed significantly enhanced bioavailability, with an area under the plasma concentration-time curve value 2.1 times higher than Axi bulk powder and 1.5 times higher than Axi BSDs. These findings established the ternary amorphous system as a robust platform for enhancing the biopharmaceutical performance of hydrophobic therapeutics.
研究领域:
药剂学
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药物递送
·
生物药剂学
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产品关联
DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2014
·Vol. 49
·期 6
·431-434
·
IF 1.164
Chunlin Bao,Guoxing Zhu,Mengqi Shen,Miaomiao Liu,Peng Xiao
A facile microwave-assistant route was developed for the synthesis of hybrid nanocrystals. Colloidal hybrid nanocrystals, Ag 2 S-CdS, were prepared by using Ag 2 S nanocrystals and cadmium diethyldithiocarbamate as raw materials under microwave irradiation. The fast ion conductor, Ag 2 S nanocrystal, catalyzes the growth of CdS nano-building blocks through a quasi solution-solid-solid mechanism. The ultraviolet-visible absorption and photoluminescence spectra of the Ag 2 S-CdS hybrid nanocrystals were investigated. One of the main advantages for this synthesis is the efficiency of dramatically reducing overall processing time. This report provides a new route for the growth of semiconductor hybrid nanocrystals based on Ag 2 S and may be extended to the preparation of other hybrid colloidal nanostructures.
研究领域:
材料科学
·
纳米技术
·
化学
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DOI
高影响因子
HYDROMETALLURGY
·
2014
·
IF 2.224
Mohannad Mayyas,Mohammad Al-Harahsheh,Xian-Yong Wei
Jordanian phosphate ore contains 70–150 parts per million (ppm) uranium. The uranium in the ore tends to dissolve during the leaching of phosphate ore with sulfuric acid to produce phosphoric acid (PA). Solvent extraction (SX) using various extracting agents is widely used to extract uranium from PA. Meanwhile, much research work has been carried out to develop suitable solid phase extractants in order to reduce cost and enhance efficiency. In this study, a new solid phase extractant has been synthesized by anchoring 2-hydroxy-4-aminotriazine onto activated carbon (ACH). The extraction of uranium from Jordanian PA using ACH and the synergistic mixture of di-ethylhexyl phosphoric acid and trioctyl phosphine oxide (DEPA–TOPO) diluted in kerosene were investigated and the performance of each extractant was evaluated and compared. The results showed that 91% extraction and 559.9 ppm loading capacity were achieved after 2 to 3 min mixing time using 0.5 M DEPA–0.125 M TOPO at 20 °C, 410 mV and 1/1 phase ratio. The activation energy ( E a ) of the solvent extraction (− 26.03 kJ mol − 1 ), calculated from Arrhenius plot, indicates that the reaction is barrier-less and exothermic in nature. On the other hand, uranium sorption onto ACH reaches equilibrium after 10 min and about 92% extraction can be achieved at 20 °C, C o = 70 mg/l, V = 200 ml, W = 100 mg and 410 mV; the rate constant for the uranium sorption onto ACH (16.54 × 10 − 3 g mg − 1 min − 1 ) was calculated from the pseudo-second order equation. The countercurrent extraction results showed that ACH has high physical, chemical stability and loading capacity about 618 mg g − 1 . Thermodynamic parameters ( ΔH ads ° = 20.61 kJ mol − 1 , ΔS ads ° = 160.47 J mol − 1 K − 1 , ΔG ads ° (333.3 K) = − 32.87 kJ mol − 1 ) suggest that the adsorption is endothermic and spontaneous in nature, which confirm the feasibility of the process.
研究领域:
化学工程
·
环境科学
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产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 30
·7473-7483
·
IF 4.157
Zhao Huaqi,Jin Xilang,Zhou Hongwei,Yang Zheng,Bai Haiyan,Yang Jin,Li Yulong,Ma Yiting,She Mengyao
Glutathione and 2-aminopyridine are used as carbon sources to prepare carbon dots (CDs) by a one-step hydrothermal reaction. The results show that the average particle diameter of CDs is 8.64 nm with uniform size distribution and the fluorescence quantum yield is 13.62%. We further demonstrate that novel CDs possess highly selective sensing of Fe 3+ from 0.2 to 200 μM with a low detection limit (0.194 μM). Meanwhile, the fluorescence of CDs can be repeated many times by the addition of S 2− . Moreover, the CDs are used for biological imaging of living cells with well cell penetrability and low toxicity. Furthermore, it is successfully applied for anti-counterfeiting and information encryption. More interestingly, it can be doped with hydrogel and filter paper to prepare solid-phase sensors exhibiting high sensitivity and fast response, demonstrating their tremendous potential for the simple, rapid, and low-cost monitoring of Fe 3+ and S 2− . Graphical abstract
研究领域:
材料科学
·
生物医学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Gongxu Zhang,Zheng Yao,Chenxi Zhang,Shuai Zhang,Helai Cheng
The removal of bound water remains one of the most significant challenges in sludge reduction. As classic predatory microorganisms, myxobacteria, exhibit broad-spectrum predatory activity against various organisms. However, it remains unclear whether myxobacteria can prey on sludge microorganisms and subsequently induce bound water release. This study demonstrates that the application of myxobacteria at different concentrations significantly reduced water content, total suspended solids (TSS), and volatile suspended solids (VSS) in sludge. Notably, the addition of Myxococcus xanthus DK1622 at 200 mg/L achieved a 0.85 % reduction in water content. At this optimal concentration, TSS and VSS decreased by up to 4.58 g/L and 2.29 g/L, respectively. The predation process induced significant changes in extracellular polymeric substances (EPS), with protein and polysaccharide concentrations increasing by 2.3-fold and 1.2-fold, respectively. These alterations were attributed to cellular material leakage during predation, which in turn contributed to EPS accumulation. Furthermore, the disruption of microbial aggregates via predatory activity facilitated the release of bound water from the sludge. These findings provide valuable insights for potential applications of myxobacteria in biological sludge dewatering processes.
研究领域:
环境微生物学
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污水处理
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生物污泥减量
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）