ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Bo Yu,Zhengrong Sun,Yubo Liu,Zhizhi Zhang,Yang Wu,Feng Zhou
The accumulation of ice in winter has brought many problems in industrial production and everyday life, and how to prevent icing or remove ice rapidly has aroused great attention from researchers in recent years. In this work, we demonstrated a strategy of using a superhydrophobic photothermal and thermal isolation macroporous xerogel (PMX) to delay icing and remove ice efficiently under faint sunlight irradiation. An oriented macroporous xerogel was prepared by an ice templating method, and multi-walled carbon nanotubes acting as the photothermal genesis component under sunlight irradiation were introduced into the xerogel. After fluorination, the PMX presented a robust water repellency and delayed icing. More importantly, numerous macropores in the PMX matrix acted as the thermal barrier that can restrict heat transmission to surroundings at maximum, which guarantees efficient anti-icing and de-icing in low temperature. Water on the PMX surface can never freeze at −30 °C under 0.25 kW/m2 (“0.25 sun”) sunlight irradiation. The outdoor experiment also has confirmed the availability of PMX in a natural winter environment. The PMX integrated with thermogenesis and thermo-isolation functions provides a new route for highly efficient anti-icing and de-icing.
研究领域:
材料科学
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能源科学
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DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 44
·28422-28432
·
IF 4.036
Xuejun Li,Dongyan Li,Zhining Liu
Micelle-entrapped silica xerogel (M-Silica xerogel) was biomimetically synthesized to combine the advantages of micelles and silica xerogel to load poorly water-soluble drug itraconazole (ITZ). Tween 20, tween 40, and tween 80 were applied to prepare micelles as the templates for M20-Silica xerogel, M40-Silica xerogel, and M80-Silica xerogel, respectively. During the silica frame construction, the surfactant formed a micelle as the porous template, silicon hydroxyl groups interacted with the hydrophilic parts of the micelle, and polyethylenimine catalyzed silica polycondensation owing to its amino groups, resulting in the formation of the M-Silica xerogels. The results showed that the particle size of the sub-particles from the M40-Silica xerogel was larger than from the M20-Silica xerogel, and the M80-Silica xerogel was the largest among these three samples, demonstrating that the emulsifying ability had a direct impact on the particle size of the M-Silica xerogel. The M-Silica xerogel had a large pore size in the range of 10–50 nm. Small mesopores (2–5 nm) dominated the pore size of the M20-Silica xerogel, while medium mesopores (5–10 nm) occupied most the pore distribution of the M40-Silica xerogel, and large mesopores (10–50 nm) shouldered most the pore distribution for the M80-Silica xerogel. Among these three drug-loaded carriers, the M40-Silica xerogel with the largest amount of medium mesopores presented the best ITZ-release behavior, demonstrating that medium mesopores facilitated drug release, while small mesopores impeded drug release and large mesopores were not favorable to retaining amorphous drugs in the pores.
研究领域:
药剂学
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材料科学
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生物医学工程
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Ruilin Wang,Dickon H.L. Ng,Shiquan Liu
A facile route was developed to recover nickel ions from a synthetic wastewater. It involved the use of silica xerogel containing amine in the nickel sulphate solution resulting in the formation of a greenish precipitate. It was found that this precipitate was mostly amorphous Ni(OH) 2 spherical aggregate composed of nanosheets. The pH level of the solution was monitored, and it was maintained in the range of 10–10.5 due to the steady release of amine from the xerogel into the waste solution. The prepared silica xerogel would provide a stable environment for the chemical precipitation of metal ions in wastewater during the whole precipitation process. The silica xerogel was collected and reused for two more cycles of recovery. The nickel removal efficiencies (99.34˜99.65%) kept unchanged and higher than those reported earlier. The collected precipitate that contained nickel hydroxide with some residual silica could be utilized as glass colorant.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Tianxiang Jin,Qingyun Luo,Hongchao Yu,Bin Huang,Zhirong Liu,Yong Qian
A novel porous xerogel of phytic acid (PA)-modified polyvinyl alcohol (PVA) was fabricated via a straightforward condensation reaction between PVA, urea, and PA. Besides serving as crosslinking agents, urea and PA also act as the pore forming agents and adsorptive functional groups of this xerogel , respectively. The decomposition and gasification of urea during synthesis formed an interconnected porous structure, dramatically raising the content of PA groups in the material as well as expose more adsorptive groups on its surface. This resultant structural characteristic allows the material to display outstanding adsorption capacity and rapid adsorption rate. Furthermore, the utilization of a compound crosslinker (urea/PA) can provide PVA with a sturdier crosslinking structure compared to the use of the two agents separately. As a result, the material shows excellent reusability, and its adsorption capacity can reach up to 89% of its initial adsorption capacity after five adsorption–desorption cycles. Density function theory (DFT) calculations demonstrated that there is a strong interaction between PA and uranium ions, conferring the material an impressive selectivity for uranium. This work could broaden insights into the tailored design and synthesis of polymer materials for the extraction of uranium.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2016
·
IF 3.138
Liping Bao,Xinyi Zhu,Hongxia Dai,Yongxin Tao,Xiaoying Zhou,Wenjie Liu,Yong Kong
Mercaptosuccinic acid (MSA) molecules were inserted into potato starch, leading to the breaking of intrinsic H-bonds within macromolecular chains of starch and the formation of intermolecular H-bonds between MSA and starch, which could be verified by Fourier transform infrared spectroscopy (FT-TR). MSA modified porous starch xerogels (PSX/MSA) were obtained after freeze-drying the MSA modified starch, and they were characterized by field emission scanning electron microscopy (FESEM), exhibiting the intriguing porous structure due to the separation of starch chains by MSA molecules. The PSX/MSA were then used as the adsorbents to remove gardenia yellow (GY), a natural colorant with genotoxicity. Due to the porous structure of PSX and the introduced carboxyl groups from MSA, the adsorption capacity of the PSX/MSA was much higher than that of the starch xerogels alone (SX). The adsorption behaviors of GY by the PSX/MSA fitted both the Freundlich isotherm model and the pseudo-second-order kinetic model, and the efficient adsorption of GY suggested that the PSX/MSA might be potential adsorbents for the removal of dyes from contaminated aquatic systems.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Xuelei Pang,Tao Yu,Fengjuan Shen,Xudong Yu,Yajuan Li
Two novel luminescent lanthanide acylamide derivatives covalently grafted to xerogels (donated as Ln-pp-xerogel, Ln = Eu, Tb) were designed and synthesized in situ via a sol-gel process. The properties of these xerogels were examined by Fourier-transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, thermo-gravimetric analysis, and photoluminescence spectroscopy. The results suggest that the lanthanide derivatives were successfully covalently bonded to the inorganic silica host. The obtained xerogel materials exhibit good thermal stabilities and possess the excellent characteristic luminescence of the corresponding lanthanide ions, which is ascribed to the energy transfer from the organic ligands to the lanthanide ions via an antenna effect. Both the xerogels in acetonitrile solution were used to selective recognition of F − ions and small organic molecule N, N-dimethylformamide by measuring the change in the signal output, which were studied by fluorescence spectroscopy in detail. The sensing mechanisms were studied by the titration of 1 H NMR spectroscopy.
研究领域:
化学
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材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Qiang Yao,Jing Guo,Fucheng Guan,Jia Li,Da Bao,Jiahao He,Xinbin Ji,Xuecui Song,Qiang Yang
In order to improve the adsorption performance of MoS 2 , as well as to solve the problems of MoS 2 -powder in adsorption, which is prone to agglomeration and difficulty to be recycled, we prepared MoS 2 -nanoflowers(MoS 2 -NFs), and mixed them with sodium alginate/polyvinyl alcohol(SA/PVA) to prepare MoS 2 -NFs/SA/PVA xerogel(MSP) by freezing-lyophilization. Then two forms of xerogels - block-MSP(MSPB) and spherical-MSP(MSPS) were prepared, and they were used as methylene blue(MB) and Cu 2+ adsorbent. It was found that MoS 2 -NFs were evenly dispersed inside the SA/PVA with no agglomeration, while the interior of MSPB/MSPS showed the structure of parallel-pores and radial-pores, respectively. The adsorption capacity of MSPB/MSPS on MB can reach 233 mg/g, which is five times higher than SA/PVA-gel, showing excellent synergistic-adsorption effect, and the adsorption capacity for Cu 2+ reaches 271 mg/g. The adsorption mechanism indicated that the adsorption of MB by MSPB/MSPS conformed to pseudo-first-order model, with electrostatic force as the main force. And their adsorption of Cu 2+ conformed to pseudo-second-order model and was dominated by Lewis acid/base soft-soft interactions. Notably, after long-term adsorption, MSPB/MSPS maintains its shape and more than 90 % of the adsorption capacity, ensuring the recovery and reuse of materials. So, MSPB/MSPS has great potential in adsorption, providing a new solution for sewage purification .
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 102
·期 2
·400-411
·
IF 2.606
Yue Wenda,Liang Jun,Wang Honghai,Zhang Yu,Li Chunli,Su Weiyi
In the entrapment of enzymes by sol-gel method, the special procedures for obtaining the unique structure of xerogel are sometimes destructive to enzymes, while the internal structure of xerogels is easily broken. To solve the above problems, we present an economical, bio-friendly procedure for the entrapment of Candida antarctica lipase B in silica xerogel. In this procedure, an encapsulation-structured enzyme-carrying silica xerogel was produced by controlling the evaporation rate of the solvent at ambient pressure during drying, while tetramethoxysilane and methyltrimethoxysilane were used as the co-precursors. The xerogel synthesis was modified and optimized for improving the stability and reusability of the enzyme, while the xerogel characteristic structure was preserved. Moreover, the effects of the co-precursors amount on the mechanical strength, pore structure, hydrophobicity, enzyme loading, and enzyme stability of the enzyme-carrying silica xerogels were systematically investigated. And the best performance was observed at the co-precursors content of 30.28 wt%. Finally, the catalytic performance of the enzyme-carrying silica xerogels on the transesterification of n -butanol with ethyl acetate was demonstrated.
Graphical abstract
研究领域:
生物化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Xiansong Li,Shiquan Liu
Silica xerogels were synthesized via the hydrolysis and condensation of tetraethyl orthosilicate (TEOS) under the catalysis of n-butylamine (BA), followed by drying the formed wet gel under ambient pressure at 120 °C. The solvents (water and ethanol) and catalyst enclosed in wet gels were recovered during the drying process. It was found that the relative percentage of ethanol in the recovered liquids increased, while those of water and butylamine decreased. The recovered liquids were directly used for four runs, and then the contents of BA, H2O, and TEOS were adjusted to maintain the reactant ratios to be the same as those in the first run, facilitating a fast sol and gel formation. Totally 12 silica xerogels with high degree of three-dimensional Si–O–Si network were synthesized. The results indicate that all the silica xerogels are composed of aggregated particles sized 20–250 nm, resulting in porous networks with specific area, pore volume, and pore diameter in the range of 290–690 m2/g, 1.54–2.40 cm3/g, and 17.4–68.2 nm, respectively. The compositional change in the recovered liquids, the drying time, and the volume of wet gel had influence on the aggregation, degree of condensation, and surface area of the cyclically synthesized xerogels. The synthesis route not only saves resources but also does not generate any waste, providing a sustainable sol−gel way to synthesize materials.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Yanshu Luo,Bingqiong Tan,Xianghui Liang,Shuangfeng Wang,Xuenong Gao,Zhengguo Zhang,Yutang Fang
With an S-shaped water sorption isotherm and high vapor uptake, as one of the famous metal organic frameworks (MOFs), MIL-100(Fe) (MIL stands for Materials of Institute Lavoisier) has been considered as a very promising candidate for adsorption heat pumps. Usually, MIL-100(Fe) is synthesized by a hydrothermal method under harsh synthesis conditions, such as high temperature and vapor pressure. In this study, in the absence of any solvent, a novel facile MIL-100(Fe) synthetic strategy, which used the dry gel conversion method, was developed. X-ray diffraction (XRD) patterns showed that the new dry gel conversion technology could expediently synthesize MIL-100(Fe) with a low reaction temperature (140 °C) and high yield (85%), which is superior to the hydrothermal method with reaction temperature of 160 °C and yield of 76%. Scanning electron microscopy (SEM) images illuminated that, compared with the conventional synthesized MIL-100(Fe) in the liquid aqueous solution, the new process synthesized one in the dry gel state exhibited a smaller crystal size (about 50 nm) due to the confined growth of the crystals. The pore analysis indicated that the MIL-100(Fe) synthesized by both processes had a similar hierarchical porous structure with the mesopore and micropore; however, compared with the traditional synthesized adsorbent, the new technology synthesized one possessed a larger pore volume due to the formation of the extra mesopores from the interconnection of the nanocrystals. The static adsorption curve exhibited that the water vapor adsorption capacity of MIL-100(Fe) synthesized by the new process was a little higher than the one synthesized by the traditional hydrothermal method. Moreover, it had a smaller desorption activation energy and better cycle stability.
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
Cell Reports Physical Science
·
2024
·
IF 7.9
Qinqin Ji,Di Li,Jingting Hu,Pan Gao,Guangjin Hou,Yanting Liu,Dehui Deng
The direct production of iso-olefins using carbon dioxide and hydrogen is a promising alternative to traditional petrochemical routes, but it has not been fully achieved due to the lack of suitable catalysts and processes for the conversion. Herein, we report a tandem process for the direct synthesis of C 4 -C 7 iso-olefins from carbon dioxide and hydrogen. The process proceeds by hydrogenation of carbon dioxide to C 4 -C 7 n-olefins over a potassium-doped ferroferric oxide and subsequent selective isomerization to C 4 -C 7 iso-olefins over a silica-alumina xerogel. A high C 4 -C 7 iso-olefin selectivity of 35.2% with 37.8% CO 2 conversion is obtained. Experiments reveal that the presence of high-density weak Lewis acid sites and the absence of Brønsted acid sites in the silica-aluminum xerogel can inhibit the cracking and hydrogenation of olefin intermediates during isomerization reaction under a hydrogen-rich atmosphere, resulting in the selective formation of C 4 -C 7 iso-olefins with a 6.9 iso-/n-olefin ratio.
研究领域:
化学工程
·
催化科学
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产品关联
DOI
高影响因子
Catalysts
·
2018
·Vol. 9
·期 1
·13
·
IF 3.465
Jianguang Zhang,Xiangping Li,Juping Liu,Chuanbin Wang
In this paper, a comparative study of MFI zeolite derived from different silica sources is presented. Dry gel conversion (DGC) method is used to synthesize silicalite-1 and ZSM-5 with MFI structure. Two kinds of silica sources with different particle sizes are used during the synthesis of MFI zeolite. The as-prepared samples were characterized by X-ray diffraction (XRD), N2-sorption, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and X-ray fluorescence spectrometer (XRF). From the characterization results, it could be seen that the high-quality coffin-like silicalite-1 was synthesized using silica sphere with particle size of 300 nm as silica source, with crystallization time being shortened to 2 h. The schematic diagram of silicalite-1 formation using silica sources with different particle sizes is summarized. ZSM-5 was obtained by adding Al atoms to raw materials during the synthesis of MFI zeolite. The performance of aqueous phase eugenol hydrodeoxygenation over Pd/C-ZSM-5 catalyst is evaluated.Keywords:dry gel conversion;MFI zeolite;particle sizes;silica sources;hydrodeoxygenation
研究领域:
材料科学
·
催化化学
✓ 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）