APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 9
·1-6
·
IF 1.784
Zhao Tian,Dong Ming,Zhao Yi
[Fe(HB(pz) 3 ) 2 ], a well-studied spin-crossover (SCO) complex, has been entrapped in NH 2 -MIL-101(Al) metal–organic framework (MOF) via gas diffusion method. [Fe(HB(pz) 3 ) 2 ] would sublimate when temperature exceeds 100 °C, especially at low pressure. Thus, in the selected condition, [Fe(HB(pz) 3 ) 2 ] molecules can be sublimated to a gas phase and diffused into the pores of NH 2 -MIL-101(Al), which yield [Fe(HB(pz) 3 ) 2 ]@MIL-101 hybrid materials. The identity of composites, with a loading of iron complex at ~ 8 wt%, was characterized by X-ray diffraction and spectroscopic attestation. The hybrid materials demonstrate a gentle spin transition curve from 300 to 400 K, which is different from the SCO behavior of [Fe(HB(pz) 3 ) 2 ]. And for the pure [Fe(HB(pz) 3 ) 2 ] sample at 400 K, only 60% of Fe(II) is in HS, while in hybrid samples, HS state is complete. This interesting phenomenon might indicate that the spin transition in the hybrid sample can be triggered at lower temperature. The composite samples were thoroughly studied by X-ray diffraction, IR spectroscopy, atom absorption spectroscopy, nitrogen physisorption, and magnetic measurements. Thereby, a novel MOF-based material with isolated SCO units is proposed, which demonstrate a salient ‘matrix-effect’ on spin-crossover behavior of [Fe(HB(pz) 3 ) 2 ].
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2018
·Vol. 5
·期 4
·785-792
·
IF 5.106
Jianmei Han,Baojuan Xi,Zhenyu Feng,Xiaojian Ma,Junhao Zhang,Shenglin Xiong,Yitai Qian
Although the melt-diffusion method was applied to fabricate sulfur-based cathode for lithium–sulfur batteries, more efforts should be devoted to the development of synthetic methodology of sulfur-based hybrids. Herein, we report a sulfur–hydrazine hydrate chemistry-based method to prepare the composite of sulfur and N-doped reduced graphene oxide (S@N-rGO) with 76% sulfur content. Relying on the reaction of sulfur and hydrazine hydrate, cyclo-sulfur was broken to form soluble polysulfides. The subsequent refluxing with GO suspension rendered the transformation of soluble polysulfides to sulfur crystal homogeneously deposited on N-rGO due to direct nucleation from solution. Simultaneously, the nitrogen doping of GO was realized with hydrazine hydrate as doping agent in the one-pot route. The as-obtained S@N-rGO composite displayed a good rate capability and excellent capacity stability up to 300 cycles. This study may provide a new and facile method to construct the composite of sulfur and N-doped carbonaceous matrix, which makes the hybrid a competitive cathode material for lithium–sulfur batteries (LSBs).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Dong Huang,Qianli Liu,Peng Zhang,Chong Ye,Fei Han,Hongbo Liu,Zhihai Feng,Shipeng Zhu,Zhen Fan,Jinshui Liu,Hao Wang
A two directional high thermal conductive carbon fiber reinforced aluminum matrix composite with low interface damage is prepared by a vacuum hot-pressure diffusion method using the mesophase-pitch-based carbon fiber (CF MP ) cloth as fast heat conduction channels. The fiber/matrix interface is composed of an amorphous gradient transition layer between aluminum matrix and CF MP rather than Al 4 C 3 interface phase , thus endowing the continuous heat conduction channels in the composite. The composites deliver the high thermal conductivity of 305.5 W∙m −1 ∙K −1 in the X (Y) direction and the low volume density of only 2.53 g∙cm −3 when the fiber volume fraction reaches 30 vol%. The high thermal conductivity of the composite is attributed to the highly oriented fast heat transfer effect of the CF MP , the isotropic heat transfer effect of the aluminum matrix and the low-damage CF MP /aluminum interface. This study opens a new avenue to design and select the high thermal conductivity and lightweight thermal management materials for the aerospace field.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Jifei Cui,John F. Kennedy,Jun Nie,Guiping Ma
Amines monomers, N , N -dimethylaminoethyl methacrylate (DMAEMA), N , N -dimethylethanolamine (DMEA), 2-dimethylaminoethylamine (DMEDA) and N -methiyldiethanolamine (MDEA) were used to induce the formation of calcium carbonate (CaCO 3 ) crystals on chitosan films, by using (NH4) 2 CO 3 diffusion method at ambient temperature. The obtained CaCO 3 particles were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and Energy dispersive spectroscopy (EDS). The influence of reaction variables, such as the additive concentration and their types were also investigated on the products. The morphologies of CaCO 3 crystals, inter-grown in cube-shape, were controlled by DMAEMA and DMEA. It was observed that the morphologies of CaCO 3 changed from the cube grown arms to massive calcite with a hole on the face by increasing the concentrations of DMEDA and MDEA. While the precipitation grew on chitosan film without any organic additive, only single cube-shaped crystals were obtained. By these results the possible mechanisms can be proposed that electronic movement of the groups on the monomer effected ions configuration and molecules absorbed on the exposed surface, resulted the change of the surface energy, which caused the change in the morphology of CaCO 3 .
研究领域:
材料科学
·
生物矿化
·
高分子材料
·
无机化学
·
功能薄膜
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Anqiao Zheng,Rui Liang,Han Wu,Guodong Jiang,Mingxia Fan,Jian Xiong,Songdong Yuan
A carbon aerogel (CA) was successfully synthesized by a sol-gel method combined with freeze-drying, followed by solution permeation impregnation and high-temperature carbonization to obtain a gadolinium oxide (Gd 2 O 3 )–doped CA composite (CA@Gd 2 O 3 ). Then, CA@Gd 2 O 3 was incorporated with sulfur by the melt-diffusion method to obtain CA@Gd 2 O 3 @S composites, which exhibited a superior electrochemical performance. The initial discharge specific capacity of the composite reached 1168.4 mAh/g at 0.1 C and maintained a reversible specific capacity of 814.4 mAh/g after 100 cycles. The outstanding electrochemical properties were mainly attributed to the strong polar adsorption of polysulfides by the abundant O 2- ions on the surface of Gd 2 O 3 , which inhibited the shuttle effect of polysulfides. Moreover, the CA doped with Gd 2 O 3 maintained a high specific surface area and large pore capacity to alleviate the poor electrical conductivity and volume expansion effect of sulfur cathode materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Xu Duan,Jian Yang,Guang Hu,Chen Yang,Yangfan Chen,Qingcai Liu,Shan Ren,Jiangling Li
In this work, based on a type of energy band engineering strategy as calcination , TiO 2 /ZSM-5 hybrids for photodegradation of methyl orange (MO) in water under UV light have been developed via a facile solid state diffusion method. Effects of varied calcination temperatures on TiO 2 /ZSM-5 hybrids have been systematically characterized including XRD , FT-IR, SEM, TEM , EDX mapping, BET, PL , EIS , UV–vis DRS, active species trapping experiments and Mott-Schottky curves. It was found that the calcination temperature influenced photocatalytic activity , typically on physicochemical properties of materials and adjustment for the energy gap and band position of TiO 2 . The XRD analysis revealed that hybridization of ZSM-5 kept the crystal phase of TiO 2 as anatase unchanged with the high-rising calcined temperature. The optimum sample calcined at 450 °C named as Z-T (450) presented nearly 99% degradation rate for MO, owing to optimal uniform distribution, highest specific surface area and best charge separation/transfer efficiency. The FT-IR comparison result that the functional groups and peak strength of the used catalyst were alike as before, showed the stability of photocatalyst . Adoption of calcination strategy does provide not only a clean, low-cost and highly efficient path to approach the complete degradation of azo dyes , but also a chance for photocatalytic technology to fulfill the implementation in industrial applications.
研究领域:
材料科学
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环境化学
·
物理化学
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催化化学
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纳米材料
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光催化技术
✓ 已验证
DOI
高影响因子
DENTAL MATERIALS
·
2025
·
IF 6.3
Zhao Li,Ying Kong,Qun Zhang,Jing Han,Kezheng Chen,Baojin Ma
Traditional guided bone regeneration (GBR) membranes face challenges in balancing mechanical strength, bioactivity, and osteoconductivity for effective periodontal bone regeneration. While collagen-based GBR membranes dominate clinical use, the weak mechanical properties and lack of osteoinductive capacity limit regeneration efficacy. Here, we presented a gas diffusion-mediated single-sided mineralization strategy to fabricate silk fibroin (SF)-based GBR membranes with dual barrier/osteoinductive functions. SF was dissolved in formic acid with Ca 2 + and, optionally, other bioactive metal ions (BMIs, such as Sr 2+ , Cu 2+ , or Mg 2+ ), and a colloid was formed after the evaporation of formic acid. Followed by gradient mineralization under CO 2 /NH 3 atmosphere and β-sheet induction via ethanol treatment, SF-Ca/X (X refers to other BMIs) membranes were prepared. Mineralized SF membranes featured a dense, mineral-free side for mechanical support and barrier, and an osteoinductive side by releasing BMIs. Interestingly, the calcium phosphate layer formed on the mineralized side, and the phase of CaCO 3 changed from calcite to vaterite, which helps phosphate mineralization. In vitro results demonstrated that the SF-Ca/Sr membrane enhanced osteogenic differentiation by upregulating BMP2/SMAD1 expression. In a rat mandibular defect model, the SF-Ca/Sr membrane significantly promotes new bone regeneration and collagen formation. Overall, this gas diffusion-mediated single-sided gradient mineralization approach integrates barrier properties with localized bioactivity, allowing for the required barrier/osteoinduction functions in the GBR process in one membrane.
研究领域:
生物材料学
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组织工程
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口腔颌面外科
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再生医学
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生物矿化
✓ 已验证
DOI
PubMed
高影响因子
RADIOCHIMICA ACTA
·
2021
·Vol. 110
·期 2
·107-119
·
IF 1.44
Yuzhen Sun,Hui Zhang,Rong Hua,Mingbiao Luo,Chuan-Pin Lee,Zhifen Wang,Weigang Liu,Jie Kong,Yunfeng Shi
Tamusu area is the primary pre-selection site of clayrock disposal repository for high-level radioactive waste (HLW) in China. However, the research on the migration behavior of nuclides in Tamusu clayrock is still in its infancy. For the first time in laboratory, the diffusion behavior of Re(VII) in Tamusu clayrock core was studied by means of through-diffusion method. The effects of pH, ionic strength and humic acid on the diffusion behavior of Re(VII) in clayrock were studied. The effective diffusion coefficient, apparent diffusion coefficient and rock capacity factor value were obtained. All the experimental conditions of Re(VII) diffusion in Tamusu clayrock are compared with other geological samples under the same conditions in literature data. The diffusion mechanism of radionuclide in Tamusu clay is discussed, which can provide experimental data for site selection and safety assessment of high-level radioactive waste repository in China. The experimental results showed an effective application and reference for the countries disposed HLW in mudrocks or clayrocks, such as France, Belgium etc. in Europe. Moreover, this research can provide the original data support for the metallogenic regularity and prospecting prognosis of rare element rhenium in different geological environments.
研究领域:
环境科学
·
核废料管理
·
地质学
·
放射化学
✓ 已验证
DOI
高影响因子
Journal of Biological Engineering
·
2020
·Vol. 14
·期 1
·1-13
·
IF 3.429
Liu Qingxiu,Zhang Wei,Chen Siying,Zhuang Zhenjing,Zhang Yi,Jiang Lingli,LIN Jun Sheng
Background Aptamers, single-stranded DNAs or RNAs, can be selected from a library containing random sequences using a method called Systematic Evolution of Ligands by EXponential Enrichment (SELEX). In SELEX, monitoring the enriching statuses of aptamer candidates during the process is a key step until today. Conformational change of an aptamer caused by target-binding in gel can be used to indicate its statuses of binding. Results In this study, an easy-to-implement gel-based diffusion method (GBDM) was developed to monitor the interaction between enriched aptamer candidates and their targets. In order to prove the concept, characterization of aptamers targeting their targets including protein (thrombin) and non-protein molecules (acetamiprid, ATP, atrazine, profenofos and roxithromycin), respectively, were performed using mini gels. Our method has advantages over the common methods including easy performed with labor- and time- saving in experimental operation. The concept has been proven by monitoring enrichment of dynamic aptamer candidate libraries targeting a small molecule 2,2-bis(4-chlorophenyl) acetic acid (DDA) during SELEX process. A mini gel cassette was designed and fabricated by our laboratory to make mini agarose gels for diffusion with different directions. Conclusions These results indicate that GBDM, in particular, chasing diffusion is suitable for monitoring the interaction between enriched aptamer candidates and their targets. These pioneering efforts are helpful for novel aptamer selection by breaking through the technical bottleneck of aptamer development and helpful for development of novel aptasensors.
研究领域:
分子生物学
·
生物化学
·
分析化学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AAPS PHARMSCITECH
·
2022
·Vol. 23
·期 6
·1-16
·
IF 4.026
Ma Lin,Guo Song,Piao Jingshu,Piao Mingguan
Griseofulvin (GF) is used as an antifungal to treat superficial skin fungal infections such as tinea capitis and tinea pedis. Currently, GF is only available in traditional oral dosage forms and suffers from poor and highly variable bioavailability, hepatotoxicity, and long duration of treatment. Therefore, the main objective of this study was to reduce the side effects of the drug and to increase the concentration of the drug retained in the cutaneous stratum corneum (SC) and improve its efficacy through the preparation of drug-laden GF microsponge (GFMS). The emulsification-solvent-diffusion method was used to prepare GFMS, and the prescriptions were screened by a single-factor approach. The optimized formulation (GFF8) had a microsponge particle size (μm) of 28.36 ± 0.26, an encapsulation efficiency (%) of 87.53 ± 1.07, a yield (%) of 86.58 ± 0.42, and drug release (%) from 77.57 ± 3.88. The optimized microsponge formulation was then loaded into a Carbopol 934 gel matrix and skin retention differences between the microsponge gel formulation and normal gels were examined by performing skin retention and fluorescence microscopy tests. Finally, the hepatoprotective and cutaneous stratum corneum retention abilities of microsponge gel formulations compared to oral GF formulations were assessed by hepatotoxicity, pharmacokinetics, and tissue distribution studies. This provides a new perspective on GF dermal stratum corneum retention administration. Graphical abstract
研究领域:
药剂学
·
药学
·
皮肤病学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2018
·
IF 3.483
Haipeng Li,Yaqiong Wei,Jun Ren,Wulin Zhang,Chengwei Zhang,Yongguang Zhang
A novel three-dimensionally (3D) ordered hierarchically porous polypyrrole (3DOHPPy) is successfully synthesized via a simple chemical polymerization method by using silica colloidal crystals as templates. The 3DOHPPy possesses a large BET specific surface area (118.5 m 2 g −1 ), 3D ordered interconnected macropores (240 nm) and mesopores (2–3 nm) on the macropore walls. The sulfur/3DOHPPy (S/3DOHPPy) composite is prepared by a solution-diffusion route followed by low-temperature heat treatment and studied as a cathode material for the lithium/sulfur (Li/S) battery. The resulting S/3DOHPPy cathode shows a high specific discharge capacity of 751 mAh g −1 even after 100 cycles at 0.1 C and great rate capability. The superior electrochemical property of the S/3DOHPPy composite is ascribed to the unique hierarchical structure of 3DOHPPy with ordered interconnected macropores that benefit enhanced mass transfer and the small mesopores on the macropore walls that can immobilize the sulfur and polysulfides produced during the discharge/charge processes.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
MICROBIAL PATHOGENESIS
·
2019
·
IF 2.581
Yanna Ma,Guang Lan,Charlie Li,Edgar Manuel Cambaza,Donghong Liu,Xingqian Ye,Shiguo Chen,Tian Ding
Staphylococcus aureus ( S. aureus ) is a zoonotic bacterium and is among the most important pathogens causing bacterial foodborne diseases. In recent years, disease caused by antibiotic-resistant S. aureus is a serious clinical problem that poses a great threat to public health. In this study, we examined the drug-resistance phenotypes and genotypes of 9 S. aureus strains. One strain was obtained from the China Center for Type Culture Collection (CCTCC), and the remaining eight strains were isolated from food. Two common methods (the Kirby-Bauer disk diffusion and broth microdilution methods) were used to detect bacterial drug resistance . Then, we analysed the relationship between the bacterial drug resistance phenotypes and genotypes. We found that some S. aureus strains isolated from food were drug-resistant or even multi-drug resistant and that there was not a perfect match between resistance phenotypes and genotypes. The viabilities of the drug-sensitive (DS), drug-resistant (DR), and multi-drug resistant (MDR) S. aureus strains were also compared when they were exposed to conditions of acid (HCl, pH = 1.5), heat (63 °C), and osmotic pressure (30% NaCl). The results showed that the DR and MDR bacterial strains had survival rates similar to or higher than those of the DS strains under environmental stress.
研究领域:
微生物学
·
食品科学
·
公共卫生
·
临床微生物学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）