JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 27
·期 1
·29-35
·
IF 1.947
Li Jie,zhang Jia,Chen Lianxi,Wen Zhuoqiong,Luo Jie,Yu Cui,Wang Pengpeng
In this study, vinyl-functionalized porous silica (V-P-SiO 2 ) and ureido-functionalized porous silica (UD-P-SiO 2 ) have been synthesized separately by using hexadecyl trimethyl ammonium bromide (CTAB) and sodium dodecyl sulfonate (SDS) as mixed templates. The samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectrum (FTIR) and N 2 adsorption–desorption measurement. The results showed that UD-P-SiO 2 with a diversity of morphologies were obtained by judiciously chosen mole ratio of SDS to CTAB (R = n SDS :n CTAB ). On the contrast, the mole ratio of surfactants had less effect on the morphologies of V-P-SiO 2 until the mole ratio of SDS to CTAB was reached 1.6, however, FTIR proved that it had effect on the vinyl groups in the V-P-SiO 2 network framework.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Yuhang Huang,Pingwei Yang,Shaokai Sun,Liyun Mao,Yunyun Zhou,Ying Liu,Juanjuan Peng,Lingzhi Zhao
Porous silica materials can serve as hemostats, offering a promising approach to promote the coagulation speed. The pore structure of porous silica is a critical property, which may influence the hemostatic effectiveness, though its exact role in the hemostasis process remains unclear. Given that the key structural parameters of porous silica, including pore size, surface area, and pore volume, exhibited strong interrelationships that significantly influence each other, we prepared porous silica with pore sizes ranging from 2.5 to 50 nm to study their hemostatic effects by both in vitro and in vivo assessments. The results demonstrated that the mesoporous material MCM-41 with small pore size (2.5 nm) and high specific surface area exhibited superior contact activation capability to the coagulation pathway. In contrast, the macroporous siliceous foam (MSF) with large pore size (50 nm) and large pore volume showed enhanced absorption of blood cells and proteins. The mesoporous SBA-15 with pore size of 5.3 nm displayed intermediate properties between the two materials. The in vivo experiments showed that among the three kinds of porous silica, the MCM-41 provided the highest pro-coagulant capacity in the tail transection rat model with minor bleeding, and the MSF performed the best hemostatic effect in the femoral artery injury rat model with spurting hemorrhage. Our study elucidates the role of pore structure of porous silica as hemostats, which may give hint to the design of such materials.
研究领域:
生物医学工程
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材料科学
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血液学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 43
·13648-13654
·
IF 0
Fei-Hu Du,Kai-Xue Wang,Wei Fu,Peng-Fei Gao,Jing-Feng Wang,Jun Yang,Jie-Sheng Chen
A graphene-wrapped silver–porous silicon composite has been prepared and used as the anode material in lithium-ion batteries (LIBs). Porous silicon (pSi) prepared through a magnesiothermic reduction of mesoporous silica MCM-41 was surface-modified by Ag nanoparticles formed via the thermal decomposition of AgNO3 and then graphene nanosheets (GNS) generated through the thermal reduction of graphene oxide. The obtained Ag–pSi/GNS composite exhibits a distinctly high reversible specific capacity, long cycling performance and super rate capability. An initial capacity as high as 3531 mA h g−1 is delivered at 0.1 A g−1, whereas at a current density of 32 A g−1, a specific capacity of 1241 mA h g−1, more than three times higher than the theoretical capacity of the graphite anode, is still retained for 50 cycles. The superior electrochemical performance demonstrates that this Ag–pSi/GNS composite is a promising electrode material for high-performance LIBs.
研究领域:
材料科学
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能源存储
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产品关联
DOI
Coatings
·
2021
·Vol. 11
·期 7
·850
·
IF 2.881
Kaixin Fu,Yi Li,Xiumin Chen,Wenhui Ma,Ziheng Yang,Tong Wang,Jiasen Liu,Zhuang Ma,Ran Chen,Xiuhua Chen,Shaoyuan Li
In this study, amino group surface-functionalized porous silicon adsorbent was successfully prepared for the first time using diamond wire saw silicon powder (DWSSP) as raw material through copper-assisted chemical etching (Cu-ACE) and organic functional group grafting. Amino-functionalized porous silicon adsorbent (TEPA-GTS-NPSi) can be used for removing As(V) from water. The properties and mechanism of the new adsorbent were characterized by infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (FE-SEM), Brunauer–Emmett–Teller analysis (BET), and thermogravimetric analysis (TGA). The concentration of metal ions in the solution was determined by inductively coupled plasma spectrometry. Meanwhile, the effects of initial pH, adsorption time, initial concentration and adsorbent dosage on the removal of As(V) in an aqueous solution were studied by intermittent adsorption experiments. The results showed that the adsorption equilibrium could be reached rapidly after 30 min soaking. Under the optimized pH of 7, the maximum adsorption capacity was 13.2 mg/g, and the minimum adsorption limit was 3 mg/L. The adsorbent shows good adsorption performance after five successive regenerated cycles. Based on the density functional theory (DFT) analysis results, the adsorption mechanism is attributed to hydrogen bond interaction between the NH2group and As(V) ions.Keywords:silicon cutting powder;copper-assisted chemical etching;surface modification;waste recycling;arsenic removal
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Acta Geochimica
·
2019
·Vol. 38
·期 4
·517-529
·
IF 0
Niu Yanhui,Yu Wenbin,Qin Zonghua,Nie Xin,Yang Shuguang,Wan Quan
Adsorption by nanoporous media is critically involved in many fundamental geological and geochemical processes including chemical weathering, element migration and enrichment, environmental pollution, etc. Yet, the adsorption behavior of metal ions on nanoporous materials has not been systematically investigated. In this study, MCM-41 material with a monodisperse pore size (4.4 nm) and a large BET specific surface area (839 m 2 /g) was hydrothermally prepared and used as a model silica adsorbent to study the adsorption characteristics of Cu 2+ as a representative metal ion. The Cu 2+ adsorption capacity was found to increase with increasing suspension pH in the range from 3 to 5 and to decrease in the presence of NaNO 3 . At 25 °C, pH = 5, and a solid-to-liquid ratio of 5 g/L, the adsorption capacity was determined to be 0.29 mg/g, which can be converted to a dimensionless partition coefficient of 45, indicating a strong enriching effect of nanoporous silica. The adsorption isotherm and kinetic data were fitted to several commonly used thermodynamic, kinetic, and diffusion models. The adsorption mechanism was also studied by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and synchrotron-based X-ray absorption spectroscopy. The results suggest that Cu 2+ ion adsorption is an entropy-driven endothermal process, possibly involving both outer-sphere and inner-sphere complexes.
研究领域:
环境科学
·
地球化学
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材料科学
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产品关联
DOI
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2023
·
IF 3.9
Huizhen Sun,Yi Li,Xiumin Chen,Xiuhua Chen,Shaoyuan Li,Wenhui Ma,Kaixin Fu
The recycling of diamond wire cutting silicon waste (DWCSW) and the removal of heavy metal ions are very important for human life. Therefore, it is a promising method to improve the selective removal of heavy metal ions by etching and modifying organic functional groups for DWCSW. In this study, a new adsorbent PA-TEPA-GTS-NPSi was synthesized by Cu-assisted chemical etching and modified with 3-glycine dioxy-propyl trimethoxy-silane (3-GTS), tetraethylpentenediamine (TEPA) and hypophosphorous acid (H 3 PO 2 ) for selective adsorption Hg(Ⅱ). PA-TEPA-GTS-NPSi showed excellent adsorption performance on Hg(Ⅱ), with adsorption capacity of 112.8 mg/g (pH=2.0, adsorption time=120 min). The pseudo-second-order model and Langmuir model can better describe the adsorption process , which proving that the adsorption process is chemisorption . The adsorption mechanism of Hg(Ⅱ) was studied by X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT). It was proved that the adsorption process was mainly caused by the strong adsorption between P and Hg(Ⅱ) in the phosphorus groups on the surface of PA-TEPA-GTS-NPSi adsorbent. Compared with other hypophosphorous acid functionalized adsorbents, the adsorption performance of the adsorbent is at a medium level, but it can effectively recycle DWCSW while removing heavy metal ions.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Haofeng Shi,Chengdeng Wang,Jiashuai Wang,Donghua Wang,Zhihao Xiong,Zhaokun Wang,Zhi Wang,Zhiming Bai,Yan Gao,Xiaoqin Yan
Developing high-performance composites with fast charging and superior cycle life is paramount for lithium-ion batteries (LIBs). Herein, we synthesized a double-shell carbon-coated porous structure composite with a compact surface (P-Si@rGO@C) using low-cost commercial micron-sized silicon (Si) instead of nanoscale silicon. Results reveal that the unique P-Si@rGO@C features high adaptability to volume expansion, accelerates electron/ion transmission rate, and forms a stable solid electrolyte interphase (SEI) film. This phenomenon arises from the synergistic effect of abundant internal voids and an external double-layer carbon shell with a dense surface. Specifically, the P-Si@rGO@C anode exhibits a high initial coulombic efficiency (ICE) (88.0 %), impressive rate-capability (612.1 mAh/g at 2C), and exceptional long-term cyclability (972.2 mAh/g over 500 cycles at 0.5C). Further kinetic studies elucidate the diffusion-capacitance hybrid energy storage mechanism and reveal an improved Li + diffusion coefficient (from 3.47 × 10 -11 to 2.85 × 10 -9 cm 2 s -1 ). Ex-situ characterization confirms the crystal phase change of micron-sized Si and the formation of a stable LiF-rich SEI. Theoretical calculations support these findings by demonstrating an enhancement in the adsorption ability of Si to Li + (from -0.89 to -0.97 eV) and a reduction in the energy migration barrier (from 0.35 to 0.18 eV). Additionally, practical Li x Si powder is shown to increase the ICE of full cells from 67.4 % to 87.9 %. Furthermore, a pouch cell utilizing the prelithiated P-Si@rGO@C anode paired with LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM111) cathode delivers a high initial reversible capacity of 7.2 mAh and 76.8 % capacity retention after 100 cycles. This work provides insights into the application of commercial silicon-aluminum alloy powder in the anode of high-energy LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Yuqi Zhang,Zimu Zhang,Weixuan Chen,Xiang Zhang,Zisheng Guan
To enhance the performance of lithium-ion battery anodes, this study leverages recycled diamond wire-cut silicon particles, a byproduct of the photovoltaic sector. These particles undergo purification through acid wash and pyrolysis to eliminate contaminants, thereby serving as potential anode materials . The inherent challenge with silicon involves its significant volumetric expansion during lithiation and delithiation , which hampers its viability for commercial applications. Addressing this, the research introduces a facile approach by synthesizing porous silicon (pSi) via the Ag-assisted chemical etching method. Subsequently, a distinctive yolk-shell porous silicon@void@carbon (pSi@V@C) structure is created using a sacrificial template approach, ensuring the formation of voids between the porous silicon core and the carbon shell. This configuration mitigates the detrimental effects of silicon's volume expansion while enhancing electrical conductivity through the carbon shell. The pSi@V@C composite exhibits promising electrochemical performance, demonstrated by an initial discharge capacity of 1826 mAh g -1 and a Coulombic efficiency of 68.6% at 0.1 A g -1 . Remarkably, it maintains a capacity of 821.8 mAh g -1 after 550 cycles at 1 A g -1 , with a retention rate of 90.4%.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Jinjing Du,Yuehao Guo,JianGuo Zhang,Dongbo Wang,Tao Zhang,Yu Zhou,Yuxiang Yangxuan,Xun Liu,Bin Wang,Qian Li
In this paper, with the goal of developing a high-performance silicon-based negative electrode through a reasonable green design using simple magnesium thermal reduction and pickling combined methods. Specifically, we utilize inexpensive photovoltaic waste silicon mud as the silicon source to synthesize porous silicon. Subsequently, we utilized self-produced porous silicon as the raw material and graphene as the coating material to fabricate a graphene-coated porous silicon-based negative electrode material with excellent cycling stability. We employ the PW91 method, which is based on density functional theory (DFT) using the generalized gradient approximation (GGA), to compute the first principles of both silicon-based materials and graphene-coated silicon/graphene composites. The study revealed that the P-Si@RGO composite exhibited excellent electrochemical properties. When adding 150 mL of graphene oxide with a concentration of 0.2 mg/mL. Even after the 100th cycle at a current density of 100 mA·g −1 , the specific discharge capacity of the P-Si@RGO electrode remains high at 1167.6 mAh·g −1 . At the same time, the results of DFT calculations also show that graphene can improve the conductivity of silicon materials. In summary, the experimental results are consistent with the results of the first-principal calculation, indicating that the computer simulation can predict the accuracy of the experiment, verify the empirical conclusions, and indicate the direction for designing the experimental scheme.
研究领域:
材料科学
·
能源存储
·
计算化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Shuai Liu,Wenjie Tao,Yang Yu,Sandile Fakudze,Chen Wang,Jiaxin Wang,Jiangang Han,Jianqiang Chen
Aiming at enhancing cyclic stability and fast charging performance of lithium-ion batteries (LIBs), a sandwich structured composite with a buffer layer of porous silicon (Si) between the carbon layer and SnO 2 layer (C/Si@SnO 2 ) was developed by using ball milling. The results showed that the Si layer with plenty of mesoporous and cracks was coated successfully and the introduction of Si increased the disordered structure of SnO 2 , including the expansion of interlayer spacing, the emergence of Sn and SiOx indicated the reaction between Si and SnO 2 occurred during the ball milling process, while the generation of Si-O-Sn and Si-O-C bonds formed by Si integration connected the three components with intimate interfaces. Used as an anode for LIBs, the C/Si@SnO 2 electrode performed a favorable discharge capacity (919.21 mAh·g −1 at 0.1 A·g −1 ), the ultra-long cyclability after 1000 and 2000 cycles, impressive rate performance (269.87 mAh·g −1 at 5 A·g −1 ), and fast charging capability accompanying discharge capacity of 805.57 mAh·g −1 at 0.2 A·g −1 and charge capacity of 400.55 mAh·g −1 at 2 A·g −1 . In addition, the electrochemical impedance spectroscopy analysis showed that the graphitic carbon layer and porous Si layer improved the rapid Li + diffusion and transportation, which was beneficial to fast charging in LIBs. Our work provided a facile and green ball milling method to construct porous sandwich structured metal oxide/C composites with the introduction of Si, which can effectively increase the disordered structure of composite and also open up a new scheme of Si materials as an anode in the field of fast charging for LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ChemNanoMat
·
2020
·Vol. 6
·期 4
·589-597
·
IF 3.384
Guixian Zhu,Lin Cheng,Ruogu Qi,Xuewu Liu
Graphical Mesoporous ZIF-8 (PZIF-8) hollow microcages are prepared through synthetic wet-chemical etching by applying porous silicon microdisks (PSi) as hard templates. It is the property of ZIFs that promotes the formation of porous hollow structures on shells. On the basis of the mesoporous structure, the protein release behavior of PSi@PZIF-8 was investigated by applying BSA as a model protein. The results showed that ZIF-8 film can prolong protein release. Metal-organic frameworks (MOFs), with high crystalline and ordered pore structures, hold great potential for various applications. However, the small microporous structures of MOFs restrict their applications. MOFs with larger porous structure and dimensions can expand their functionality to integrate with other large active agents. By applying porous silicon microdisks (PSi) as hard templates, zeolitic imidazolate frameworks (ZIFs) were assembled on PSi to form PSi@ZIF-8 core-shell microdisks. A new porous structure of ZIF-8 microcages was obtained via a post-synthetic approach. The influence of PSi and reaction precursor for ZIF-8 were explored, and the formation mechanism of mesoporous ZIF-8 (PZIF-8) hollow microcages was also proposed. By applying bovine serum albumin (BSA) as a loading agent, the protein release behavior of PSi@PZIF-8 was investigated. It is noted that prepared PZIF-8 microcages could serve as new vectors for loading active agents.
研究领域:
材料科学
·
生物医学工程
·
化学工程
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产品关联
DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2014
·Vol. 211
·期 7
·1651-1654
·
IF 1.525
Jiaqing Mo,Yajun Liu,Chunliang Liu,Zhenhong Jia
This paper reports on the use of a novel all-porous-silicon configuration consisting of a surface grating and a high-reflectivity quarter-wave stack, arranged as both an all-porous-silicon grating diffractive device, and a highly sensitive and inexpensive biosensor. The diffraction efficiency of the top surface grating in this structure can be considerably improved for biosensing. Moreover, a porous-silicon high-reflectivity multilayer can not only prevent the signal energy from radiating to the substrate, but also increase the internal surface area of the sensing platform for detecting more probing molecules. When 3-aminopropyltriethoxysilane (APTES) was employed as a probing molecule, the sensitivity of the proposed structure increased up to 1 order higher than the porous-silicon diffraction-grating biosensors without a high-reflectivity quarter-wave stack. It has been shown by experimentation that before and after the APTES, −3-order diffraction efficiency changes from 1.30 × 10 −3 to 1.25 × 10 −4 . Excellent agreement is achieved between the experimental results and simulations based on the rigorous coupled-wave analysis.
研究领域:
材料科学
·
生物医学工程
·
光学工程
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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）