NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 8
·3901-3908
·
IF 3.925
Zhiping Chen,Li Liu,Faxiang Shi,Wenwu Zhou,Zhiyuan Yang,Anning Zhou
A series of hierarchical SAPO-11 molecular sieves synthesized by adding mesoporogens with different alkyl chain lengths were prepared. The synthesized hierarchical SAPO-11s were characterized by XRD, SEM, N2 adsorption–desorption, TEM, NH3-TPD and Py-IR. The results showed that the physicochemical properties of the hierarchical SAPO-11s change with the increase of the alkyl chain length, and the hierarchical SAPO-11 molecular sieve synthesized with DTAB has the largest external surface area and pore volume, and the most medium and strong B acid sites. Furthermore, the 1-octene hydroisomerization reaction on Ni catalysts supported on hierarchical SAPO-11 was investigated and the experimental results showed that the alkyl chain length of the mesoporogen has an obvious influence on the hydroisomerization selectivity. The hierarchical Ni/SAPO-11 catalyst synthesized using DTAB has the highest selectivity of C8 isomers and the lowest cracking selectivity. These results indicate that DTAB is the most suitable mesoporogen for the synthesis of hierarchical SAPO-11 molecular sieves for 1-octene hydroisomerization.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2016
·
IF 0
Chag Ku Ding,Jing De Zhang,Ya Lei Liu,Jin Yan Gou,Jun Peng Luan
A comparative study has been carried out on the effects of pore-forming agents on the microstructural characteristics and properties including porosity, microstructures, linear sintering shrinkage and mechanical strength of NiO/yttria stabilized zirconia (YSZ). Different pore-forming agents (soluble starch, graphite and activated carbon) were incorporated into NiO/YSZ at various mass mixing ratios (5%, 10% and 15%). The experimental results show that under the condition of same content, sintered samples using activated carbon as pore-forming agent had a higher porosity than that with identical content of the other two kinds of pore-forming agents. Sintered samples with 10.0 wt% activated carbon had a porosity of 35%. Section morphologies show that pores distributed uniformly and connected very well in the anode with activated carbon as pore-forming agent. The mechanical strength of these sintered samples with carbon as pore-forming agent was also higher. With the activated carbon particle size decreasing (from 100 mesh to 320 mesh), the open porosity of porous NiO/YSZ was reduced (from 31.7% to 30.9%). It may be concluded that The activated carbon is the better choice as pore-forming agent for NiO/YSZ anode.
研究领域:
材料科学
·
燃料电池研究
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Song Lv,Liya Ma,Xinyu Shen,Hua Tong
Nitrogen-doped hierarchical porous carbons are an ideal electrode material for achieving high-performance supercapacitors. However, the design and control of hierarchical porous structure generally requires complicated synthesis steps and expensive pore-former, which greatly limits its development. A simple dual pore-former method with one-step carbonization is proposed to prepare nitrogen-doped hierarchical porous carbons (CHC-ZnK). The dual pore-former of zinc acetate and potassium citrate can not only prepare pores of different sizes through a variety of mechanisms, but also have a great complementary effect on the control of the carbon material structure . CHC-ZnK with the hierarchical porosity and the large surface area delivers high specific capacitance of 408.9 F g −1 and excellent rate performance. The assembled symmetric supercapacitor exhibits high energy density and can ensure that the light-emitting diode run normally.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2024
·
IF 7
Zhe Li,Xiaosui Luo,Abid Naeem,Zhengji Jin,Qiong Li,Yongmei Guan,Lihua Chen,Weifeng Zhu,Liangshan Ming
Polyvinylpyrrolidone K30 was used as the templating agent, and ammonium bicarbonate was used as the pore-forming agent to make porous mannitol and porous lactose by the template and pore-forming agent method, respectively. Compared with the template method, the porous particles prepared by the pore-forming agent method have larger pore diameter (320.276 nm and 250.528 nm) and specific surface area (1.018 m 2 /g and 0.913 m 2 /g). The molecular docking results showed that mannitol/lactose interacted with curcumin and adhered to each other through hydrogen bonding. The adsorption kinetics process of porous mannitol and porous lactose prepared by template agent, pore-forming agent and curcumin were different. Among the curcumin-loaded porous particles prepared by the two methods, the curcumin-loaded porous lactose prepared by the pore-forming agent method had the fastest release rate and the highest cumulative release rate (95 %). Curcumin releases consistent with the Peppas release kinetics model and the diffusion mechanism.
研究领域:
药剂学
·
生物材料学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yangfang Cheng,Yougen Yu,Cheng Peng,Jianqing Wu
Pore formers are essential for preparation of high performance ceramic membrane supports. The removal of the pore former is a key process affecting the sintering rate and quality. To avoid excessive concentration of pore former removal at a certain temperature, we choose carbon black, sawdust and hydroxyethyl cellulose (HEC) as a composite pore former to prepare supports with high flux and sinter the supports rapidly. According to thermal analysis results of the three pore formers, we designed the ratio of sawdust/carbon black/HEC as 5/3/2. By tuning the firing temperature, pore former content and heating rate, the supports prepared with this method exhibited a pure water flux of 45.4 m 3 m −2 h −1 bar −1 and a bending strength of 46.2 MPa. The properties are highly dependent on the pore former content and slightly on the heating rate, which means that the composite pore former method can greatly reduce the time consumption without damage to the support quality. The corrosion experimental results also indicate the supports are quite resistant to strong acid and alkali corrosion. In summary, the composite pore former method is a promising way to fabricate supports with excellent performances and realize the fast firing of high porosity ceramic membrane supports.
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
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Libin Ma,Xiaogang Luo,Ning Cai,Yanan Xue,San Zhu,Zhen Fu,Faquan Yu
To achieve the dual features of fast oil absorption rate and high oil absorbency for the practical application in emergency treatment of spilled chemical pollutants, hierarchical porous resins were synthesized. The polymerization of high internal phase emulsion was applied to fabricate the porous structure for the purpose of high oil absorbency. Polymeric porogens were proposed to adjust the second-order or interconnected pore structure for fast oil absorption rate. SEM revealed the hierarchical porous structure. Molecular weight and dose of polymeric porogen were investigated for the effect on the formation of porous structure and absorption features. Optimized resins have 31.5 g/g or 17.1 g/g absorbency for chloroform and toluene, respectively, and only 5 min is needed to reach their saturation absorption. Besides, the porous resins demonstrated high oil retention under pressure. The absorption/desorption cycling results revealed the high repeatability of recovered resins. All these tests predicted the potential applications of porous resins of this kind particularly in the emergency treatment of oil and chemical pollution.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Weiwei Shi,Quanqi Zhang,Shiji Liu,Suisui Su,Binbin Chang,Baocheng Yang
The superior ultramicroporosity and enriched surface CO 2 -philic sites are simultaneously required features for high-efficiency carbon-based CO 2 adsorbents. Unfortunately, these characteristics are usually incompatible and difficult to integrate into one porous carbon material. Herein, we report a new copper ions (Cu 2+ )-assisted dynamic porogen to construct hierarchically microporous carbon nanosheets in a large scale with high heterogeneity for solving such issue. Cu 2+ can be equably dispersed in precursor by coordination interactions of COO-Cu and Cu-N, which can anchor more N/O-containing species in final product. The reduced cuprous ions (Cu + ) in pyrolysis process functions as a dynamic porogen to tailor uniform ultramicropores. Importantly, copper salt extracted in this synthetic procedure allows cyclic utilization, realizing a green and low-cost process. The obtained carbon sheets possess a graphene-like morphology, a high surface area and a high-proportioned multiscale microporosity , especially a high-density ultramicropores of 0.4–0.7 nm and supermicroproes of 0.8–1.5 nm. The maximized synergistic effect of morphology, high density of multi-sized ultramicroporosity and surface high heterogeneity endow the resultant microporous carbon nanosheets with the remarkable CO 2 capture property, including a high uptake, a moderate adsorption heat, a good selectivity and superior recyclability.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·Vol. 45
·期 3
·3710-3714
·
IF 3.057
Yue Hu,Zhen Xiao,Huanping Wang,Can Ye,Yuqian Wu,Shiqing Xu
Porous CaSiO 3 ceramics were prepared via a solid-state reaction method using CaCO 3 and SiO 2 as raw materials and active carbon as a pore-forming agent. The results indicated that porous CaSiO 3 ceramics could be obtained under a low sintering temperature of 1320 °C. The addition of active carbon significantly affected the volume density, microstructure, pore size distribution and mechanical strength of porous CaSiO 3 ceramics. With the increase of active carbon content, the volume density decreased, meanwhile the pore size and porosity increased gradually. Besides, the three-point bending tests demonstrated that the mechanical strength was decreased with increasing active carbon content. However, all the porous ceramics still exhibited high mechanical strength. These results implied that the increase of active carbon content not only enlarged the pore size and enhanced the porosity, but also kept a remarkable mechanical strength of porous CaSiO 3 ceramics. Therefore, these rationally designed CaSiO 3 porous ceramics will be a highly potential material in various applications due to its high mechanical strength, low sintering temperature and narrow pore size distribution.
研究领域:
材料科学
·
生物陶瓷
·
组织工程
·
生物医学材料
·
无机非金属材料
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2013
·
IF 0.807
Weiwei Xun,Yulin Yi,Chongyin Zhang,Sixun Zheng
In this contribution, we reported the preparation of mesoporous silica with a reactive block copolymer as the porogen via sol-gel process. Firstly, poly(glycidyl methacrylate)-block-poly(ϵ-caprolactone)-block-poly(glycidyl methacrylate) triblock copolymer (PGMA-b-PCL-b-PGMA) was synthesized with the combination of ring-opening polymerization (ROP) and reversible addition-fragmentation chain transfer (RAFT) polymerization. Thereafter, the triblock copolymer was functionalized via its reaction with 3-aminopropyltriethoxysilane (APTES) to afford a new reactive block copolymer bearing triethoxysilane moieties. The latter was employed to perform the inter-component sol-gel reactions with tetraethoxysilane (TEOS) to obtain the organic-inorganic composites with various compositions. The organic-inorganic composites were subsequently used as the precursors to obtain the mesoporous silica materials via pyrolysis at elevated temperatures. The surface-area Brunauer-Emmett-Teller (BET) measurements indicate that the materials of mesoporous silica with adjustable porosity have been successfully obtained.
研究领域:
高分子化学
·
纳米材料
·
生物医用材料
·
多孔材料
·
药物递送系统
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Qichao Liang,Fei Lu,Farhat Shakeel,Xueying Wang,Yilin Sun,Jiefang Wang,Hai Huang,Jinrui Su,Bin Cai
The porous structure of anodes is crucial to the performance of intermediate-temperature solid state fuel cells (IT-SOFCs). With the rapid development of high performance cathodes, the role of anodes needs to be considered again. A hierarchical porous Ni-Ce 0.8 Sm 0.2 O 2-δ (SDC) anode consisted of ∼200 nm width, and ∼800 nm and ∼10 μm diameter pores can be formed by reducing NiO, and burning of polymethyl methacrylate (PMMA) and starch pore-formers with a total load of 20 wt%, respectively. For single cells with Ni-SDC|SDC|Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ configuration, the peak power density (PPD) (0.26–1.73 W·cm −2 ) at 723–923 K is achieved with the addition of 10 wt% starch + 10 wt% PMMA, which is 136–52 % and 86-14 % higher than that without pore-formers and with 20 wt% starch, respectively. More importantly, it has a similar long-term stability of the cell without pore-formers. The comprehensive results suggest that the apparent improvement in PPDs is primarily attributed to the increased length of effective three-phase boundaries due to the formation of a percolation network of anodes, while also highlighting the significant influence of anode/electrolyte interface polarization on the electrochemical performance of IT-SOFCs.
研究领域:
材料科学
·
电化学
·
能源材料
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2024
·Vol. 67
·期 3
·954-964
·
IF 6.8
Chen Jiayue,Cao Meilian,Yue Yiying
The high-value utilization of lignin meets the demand for the reclamation of wastes and is of great significance for achieving carbon neutrality. However, lignin is unstable and prone to melting and deformation at high temperatures, requiring a long period of stabilization. The carbon nanofiber (CNF) membrane prepared by electrospinning has advantages such as high aspect ratio, low density, good light absorption, and a large number of pores favorable for steam transportation. Based on co-electrospinning, a lignin-based CNF membrane material was prepared in this work. The preparation process of this material can not only save the stabilization time of lignin-based nanofibers but also improves the hydrophilicity and light absorbance of the membrane through zinc chloride activation and the addition of pore-forming agents (terephthalic acid and polymethyl methacrylate). As a photothermal layer of an interfacial solar evaporation system, the membrane has a light absorption of 94.3% over the whole sun spectrum. Furthermore, the interfacial solar evaporation system with the prepared CNF membrane as the photothermal layer has an evaporation rate of 1.43 kg m −2 h −1 under one sun, with an evaporation efficiency of 93.8%. In addition, the evaporator has good circulation and salt resistance ability. After 15 h of continuous illumination, it still maintains excellent evaporation rate. This type of CNF membrane with lignin as the main carbon source has great potential as a photothermal conversion material in future desalination applications.
研究领域:
材料科学
·
环境工程
·
能源技术
·
纳米技术
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Fuyu Chen,Changqing Xiong,Xiangdong Cheng,Ying Shi,Hui Chen,Qinfang Zhang
The electrode is crucial for electrochemical reactions, significantly impacting the vanadium flow battery (VFB) performance. However, their relatively low electrochemical activity remains a major obstacle to developing high-performance VFBs. To overcome this limitation, we introduce a catalyst synthesized by integrating pore-forming agents─specifically, poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) triblock copolymer (P123) and polyoxyethylene–polyoxyethylene–polyoxyethylene triblock copolymer (F127)─into MnO@C derived from a metal–organic framework. This study marks the first application of such an approach to VFB enhancement. A comprehensive analysis is conducted to examine the catalyst’s morphology, composition, electrocatalytic activity, and charge–discharge behavior. The results reveal that (i) the prepared catalysts possess a nanoporous structure with MnO nanoparticles uniformly dispersed in amorphous carbon; (ii) pore-forming agent-modified MnO@C, especially P123–MnO@C, exhibits a large specific surface area, an abundance of oxygen-containing functional groups, and exceptional electrochemical activities; (iii) it enhances the energy efficiency of VFBs by 5.7% compared to those utilizing raw carbon felts and by 5.1% over those with MnO@C electrodes at 100 mA cm–2; and (iv) it significantly improves operating voltages, cell capacities, high current density properties, and cycling performance. Thus, this study proposes an innovative electrochemical catalyst for VFBs, enhancing performance and advancing renewable energy storage solutions.
研究领域:
电化学
·
储能
·
纳米材料
·
催化
·
电池技术
✓ 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）