ADVANCED ENGINEERING MATERIALS
·
2022
·Vol. 24
·期 10
·2200125
·
IF 4.122
Xudong Yang,Mingrui Xie,Weiting Li,Junwei Sha,Naiqin Zhao
Silicon (Si) has a significant influence on the cellular structure and microstructure of the aluminum (Al) foams, which in turn will notably affect their mechanical responses. Herein, the Al–Si foams are fabricated via a novel powder metallurgy foaming approaches with multiple Si contents to investigate the role of Si concentrations on the structural and mechanical properties. The results show that the certain contents of Si can not only delay the expansion process, but also increase the maximum expansion rate to improve the cellular structure. Specifically, the AlSi7 foams process the optimal comprehensive compressive properties of yield stress (4.36 MPa), plateau stress (6.02 MPa), and energy absorption capacity (3.47 MJ m −3 ) with the relative density of 0.15. However, excessive Si can decrease the expansion rate and deteriorate the cellular structure. Moreover, the deformation mode of the Al foams during compressive process converts from plastic mode to brittle mode by the adding of Si. Generally, the AlSi7 foams possess an excellent trade-off between toughness and brittleness and exhibit the optimal mechanical responses.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Fubin Wen,Yufang Chen,Tao Jin
Developing of adsorbents with merits of higher adsorption capacity and quicker adsorption equilibrium through facile method merits more attention. Generally, large specific surface area porous adsorbent coupled with multi functional groups is a wise option. In the current work, a feasible protocol of preparing efficient adsorbent toward Pb 2+ was established via integrating amino abundant hyperbranched polyamidoamine and bimodal pore structured mesocellular siliceous foam. The polyamidoamine was synthesized through a vacuum thermo polymerization method by gradually elevating temperature. The uniform spherical mesocellular siliceous foam substrate was prepared via inorganic salt-assisted soft-template method, and the pore structure and particle morphology were adjusted through post hydrothermal treatment. The obtained hyperbranched polyamidoamine immobilized mesocellular siliceous foam was characterized using FT-IR, SAXS, BET, SEM, TEM, TGA and zeta potential measurement techniques. Large specific surface area, unique bimodal pore structure with interconnected spherical and window pore and ultra large pore diameter rendered the adsorbent high adsorption capacity and efficient elimination. Batch experiment results elucidated that various operating parameters including pH, contact time, initial Pb 2+ concentration, temperature and ionic strength deemed to be at play in adsorption behavior. The measured experimental maximum adsorption capacity at 298.15 K was 142.87 mg·g −1 . The equilibrium data fitted well by pseudo second order kinetic model unveiled that the rate determining step might be chemical adsorption. The adsorption behavior was found to more suitable described with Langmuir isotherm model, implying the formation of adsorbate monolayer, and thus a maximum adsorption capacity of 315.46 mg·g −1 at 298.15 K was estimated. An underlying spontaneous entropy increased endothermic nature of adsorption of Pb 2+ by the as-prepared adsorbent was conceived through adsorption thermodynamics study. Furthermore, a possible adsorption mechanism of comprehensive interaction of chemical chelation and ion exchange was proposed. This study supports the prospect that hyperbranched polyamidoamine immobilized mesocellular siliceous foam can serve as a candidate for efficiently removing Pb 2+ from aqueous solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2015
·
IF 2.752
Shuchen Tu,Fengzhu Lv,Pan Hu,Zilin Meng,Hongtao Ran,Yihe Zhang
Secondary and primary amines containing silica foams (F–SiO 2 ) were prepared by using silane coupling agents, (3-aminopropyl) triethoxysilane (KH-550) and bis(3-triethoxysilicyl propyl)-amine (KH-270), as modifiers. Not only Brunauer–Emmett–Tell (BET) surface and pore size of F–SiO 2 are greatly reduced after modification, but also increased chemical oxygen demand (COD) removal efficiency to trinitrotoluene (TNT) red water is obtained. Among the series of F–SiO 2 , the secondary amine modified silica foams possess higher COD removal capacity. Controlled experiments indicate the adsorption mainly derives from the attraction of amine groups toward the negative organic pollutants in TNT red water rather than the effect of the large BET surface and hydroxyl groups on the surface of F–SiO 2 . The adsorption model studies show the pseudo-second-order dynamic adsorption model and Langmuir isotherm model well fit the experimental data. The prepared amine-modified F–SiO 2 is an efficient adsorbents of organic pollutants in TNT red water.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhengzhong Wu,Yinan Zhao,Hongqiang Li,Xingrong Zeng,Jiazhi Lin,Jiawei Wu,You Zhou,Guizhong Chen,Xuejun Lai
The development of multifunctional silicone foam with high fire safety is of great significance to realize intelligent fire protection but challenging. Herein, a multifunctional ceramifiable fire-retardant silicone foam (MCSF) was fabricated by Ti 3 C 2 T x nanosheet (MXene), multiwalled carbon nanotube (MWCNT), γ-aminopropyltriethoxysilane (APTES), Karstedt catalyst (Pt) and vinyl dimethylsiloxane via water–oil interface induced self-assembly and dehydrogenation foaming at room temperature. MCSF possessed low density and good mechanical properties. Its improved thermoelectric performance and sensitive fire-warning capability of MCSF were attributed to the skeleton supporting effect and unique electron transport effect between MWCNT and MXene. When being burned, MCSF was able to trigger the fire-warning system within 2.4 s and repeatedly alarm the fire reignition. Furthermore, owing to the synergism between APTES and Pt, MCSF exhibited good ceramization performance. When encountered high temperature, the MCSF surface rapidly ceramized, generating a ceramic-like barrier layer to block the further flame ablation, and it quickly self-extinguished after removing from flame. Besides, MCSF showed impressive thermal insulation and durable piezoresistive sensing. This work provides a new strategy for the preparation and application of multifunctional fireproof polymer foams.
研究领域:
材料科学
·
消防安全
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Nanomedicine
·
2020
·
IF 5.115
Wei Xin,Yumei Wang,Xianmou Guo,Kaijun Gou,Jing Li,Sanming Li,Lin Zhao,Heran Li
Purpose The aim of this study was to improve the oral bioavailability and anti-inflammatory activity of the poorly soluble drug ibuprofen (IBU) by employing a new kind of poly(ethyleneimine)s (PEIs)-based mesocellular siliceous foam (MSF) called B-BMSF@PEI as drug carrier.Methods B-BMSF@PEI was biomimetically synthesized by using PEIs as templates, catalysts and scaffolds under ambient conditions, and the structural characteristics, including size, morphology, mesoscopic structure and pore properties, were estimated by TEM, SEM, FTIR and N2 desorption/adsorption measurement. Then, IBU was incorporated into B-BMSF@PEI at the drug:carrier weight ratio of 1:1. The structural features of IBU before and after drug loading were systemically characterized. IBU and B-BMSF@PEI were then subject to in vitro drug release study and wettability analysis. Finally, in vivo pharmacokinetics and anti-inflammatory pharmacodynamics studies were carried out to evaluate the efficacy of B-BMSF@PEI on improving the oral adsorption of IBU.Results The results demonstrated that B-BMSF@PEI was a meso–meso porous silica material with foam appearance. It consisted of uniform spherical cells (40 nm) with interconnected pore networks. IBU can be successfully loaded into B-BMSF@PEI with high efficiency (as high as 39.53%), and crystal IBU was effectively converted to an amorphous state during this process. Benefiting from the great architectures of B-BMSF@PEI, IBU/B-BMSF@PEI performed good wetting property and significantly improved the dissolution rate in both simulated gastric fluid (SGF) and simulated intestinal fluid (SIF). Notably, IBU exhibited very satisfactory relative bioavailability (681.4%) and anti-inflammatory effects (the inhibition rates were between the ranges of 113.5% to 1504.3%).Conclusion B-BMSF@PEI with bimodal mesoporous system and interconnected nanopores was obtained owing to the dynamic self-assembly functions of PEIs. It had superiority in drug loading and could improve the oral adsorption of ibuprofen to a satisfactory level.
研究领域:
药剂学
·
材料科学
·
药物递送
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 5
·1269-1278
·
IF 2.162
Fu-Ru Kang,Jun Deng,Dong-Sheng Jiao,Li-Qun He,Wei-Feng Wang,Zhi-Chao Liu
A novel and versatile route for fabricating flame-retardant microcapsules via microfluidics technology is reported. The flame-retardant microcapsules were prepared with a dimethyl methylphosphonate (DMMP) core and an ultraviolet-curable (UV-curable) polysiloxane shell. Furthermore, a UV-curable polysiloxane was synthesized. The synthesis mechanism of UV-curable polysiloxane and the curing mechanism of flame-retardant microcapsules were analyzed. To verify that DMMP was encapsulated in the microcapsules, X-ray fluorescence was used before and after microencapsulation. The resulting microcapsules were well monodispersed and exhibited a good spherical shape with a smooth surface. In addition, the size of the microcapsules decreased dramatically with an increasing flow-rate ratio of the middle-/inner-phase or outer-phase flow rate. The thermal stability of the microcapsules was worse than shell materials but superior to DMMP. Silicone foams (SiFs) with microcapsules prepared using a dehydrogenation method achieved a relatively higher limiting oxygen-index value than the pure SiF, which indicated that the microcapsules could enhance the flame retardation of SiFs effectively. Because of the polysiloxane shell, the microcapsules had good compatibility with SiFs, and the influence of microcapsules on the mechanical properties of SiFs was unremarkable.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Ye He,Mengyang Wang,Haotian Zhang,Youxi Zhang,Yikun Gao,Siling Wang
Numerous types of mesoporous silica nanoparticles (MSNs) have been studied as carriers for small molecular drugs. However, few reports have been conducted on small MSNs having large pores, and that are suitable for loading and orally delivering therapeutic proteins. In particular, their protective properties against aggregation and enzymatic hydrolysis of loaded proteins have been rarely studied. In this study, mesocellular silica foams (MCFs) with large and different pore sizes were prepared. The loading and release behaviors of three model proteins with different molecular weights were studied. The protective properties of the MCFs against enzymatic hydrolysis of the loaded proteins were tested by sodium dodecyl sulfate polyacrylamide gel electrophoresis and high-performance liquid chromatography. The protecting effects of the MCFs against conformational change and aggregation of the loaded proteins were evaluated by circular dichroism and synchronous fluorescence spectra . Diabetic mice were inducted to evaluate in a preliminary manner the in vivo hypoglycemic effect of insulin loaded MCFs. The prepared MCFs showed rapid and high drug loading (up to 43%) of proteins. The release of proteins was tunable depending on the pore size. The lysozyme loaded MCFs could release 87% intact protein after incubation with pancreatin for 0.5 h. The digestion times for the insulin loaded in MCFs were prolonged to twice that of naked insulin. The secondary conformational changes for the insulin loaded in MCFs were only 1/40 to 1/20 of that of naked insulin incubated with Zn 2+ . Orally administered insulin-loaded MCF could reduce the blood glucose level to 69%. The prepared MCFs could effectively protect the loaded proteins from aggregation and enzymatic hydrolysis, thus exhibiting potential for application as carriers for protein delivery.
研究领域:
药剂学
·
生物材料
·
蛋白质工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2015
·Vol. 22
·期 5
·1357-1362
·
IF 1.108
Yin Liuyan,Zhou Xingui,Yu Jinshan,Wang Honglei
A planetary ball-milling foaming route was employed by the protein foaming method for preparing silicon nitride (Si 3 N 4 ) foams. In comparison with the commonly used tumbling foaming route of protein foaming method, pores of the Si 3 N 4 foams fabricated by this new foaming route are more uniform in size distribution and the pores pack more compact. Furthermore, effects of the rotating speed on the structure and the property of the Si 3 N 4 foams fabricated by this new foaming route were investigated. It was indicated that the average pore size decreased with the rotating speed, whereas the count of windows on the walls increased with the rotating speed. Moreover, the windows were found to have a negative influence on the phase transformation of Si 3 N 4 from α phase to β phase.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Jing-hui Yang,Qin-ru Pu,Wen-jin Hu,Qing-qing Liu,Xin Li,Wen-hao Huang,Nan Zhang,Yong Wang
Passive daytime radiative cooling (PDRC), an energy-saving and environmentally friendly strategy, achieves cooling without any power consumption by reflecting sunlight and radiating energy to outer space. Herein, it is shown that a porous-structured poly(dimethylsiloxane)/silicon oxide (PDMS/SiO2) composite foam is fabricated through “pore in pore” engineering, in which a three-dimensional self-supporting silicon dioxide (SiO2) network is constructed in the pores of PDMS foam fabricated via freezing casting. The PDMS/SiO2 foams exhibit a hierarchical porous structure like “SiO2 assembling pores in PDMS micropores” and significantly benefit the reflectivity and infrared emissivity. An average solar reflectivity of ∼90.1% within a full spectral range of 0.3–2.5 μm and an average emissivity of ∼94.1% in the atmospheric window allow for the temperature inside the foam cavity to drop by ∼11.1 °C under direct sunlight with the solar radiation intensity of 871 W m–2. Notably, the hierarchical porous PDMS/SiO2 foams exhibit excellent thermal insulation, antifouling, and hydrophobic performances, weakening the heat flow from the external environment and ensuring long-term outdoor use. Such a powerful radiative cooling performance integrated with thermal insulating and antifouling capability by the foams constructed by “pore in pore” engineering offers a way to efficiently manage sunlight radiation energy to make devices, vehicles, buildings, and other urban objects cooler and helps to save energy in an outdoor sunlight environment.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 12
·2476-2480
·
IF 1.113
Hao Youwei,Zhao Jie,Wang Gang,Cao Liqin,Wang Jide,Yue Fan
Mesocellular silica foam (MCF) grafted with thermo-responsive and pH-responsive copolymer poly( N -isopropylacrylamide- co -acrylic acid), was prepared by precipitation polymerization using supercritical carbon dioxide (scCO 2 ) as entrainer and solvent. Vinyl-functionalized MCF was first synthesized through post-synthesis via using vinyltriethoxysilane as a coupling agent for surface modification. Entrapped monomers of N-isopropylacrylamide (NIPA) and acrylic acid (AA) were then introduced and assembled onto the vinyl-modified MCF with the aid of scCO 2 . The grafting copolymer performed here as an on/off switch in the release of 5-fluorouracil, as confirmed by using UV-visible absorption spectroscopy. The grafted organic content and drug loading efficiency were 65.2 wt% and 11.5 wt%, respectively. The resultant grafting composite showed potential for application in drug delivery and exhibited thermo- and pH-responsiveness to external environmental changes.
研究领域:
材料科学与工程
·
生物医学工程
·
药学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Haitao Shi,Jiajia Yang,Zia Ahmad,Haijun Zhang,Jiping Chen
Solid amine materials have emerged as a class of adsorbent with promising potential for CO 2 capture from gas mixtures, such as biogas and flue gas. In this work, we developed a novel CO 2 capture material via co-grafting of polyethyleneimine (PEI) on mesocellular silica foam (MCF), and (3-glycidyloxypropyl)triethoxysilane (GPTES) was first used as a bridging medium. In the fabrication procedure of MCF@G-35.6 %PEI, a simple impregration of PEI in MCF modified with epoxy groups was conducted. In this procedure, the co-grafting of PEI was realized in terms of a portion of PEI (21.3 wt%) was anchored on the pore surface of MCF via the epoxy/amine reaction and the rest of PEI (14.3 wt%) could be stably attached to the pore surface of MCF via its interaction with anchored PEI. After systematic evaluation, the MCF@G-35.6 %PEI exhibited a maximum CO 2 adsorption capacity of 2.78 mmol/g at 50 °C and 50 %RH and fast adsorption kinetics with equilibrium time (break through from C/C 0 = 5 % to 95 %) is 22.85 min. Meanwhile, outstanding CO 2 adsorption capabilities within a wide temperature range of 30–90 °C and a large concentration range of 5–30 % vol. CO 2 were obtained by the use of MCF@G-35.6 %PEI. More importantly, the MCF@G-35.6 %PEI also exhibited an excellent long-term stability over 50 consecutive cycles. CO 2 adsorption kinetics of the sorbent was found to follow Avrami’s fractional order model and intraparticle diffusion model. Furthermore, temperature-programmed desorption was conducted to investigate the desorption kneitics and adsorption mechanism. All these findings demonstrate the great potential of MCF@G-35.6 %PEI for carbon capture and sequestration (CCS) technology.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Linqing Tian,Li Ha,Li Wang,Guangjin Chen,Frederic Coulon,Yuelu Jiang,Xin-Yang Zeng,Ruifeng Zhang,Guozhong Wu
Solidified natural gas technology shows significant potential for storing safely multi-fold volumes of natural gas in clathrate hydrates, but the main concern is the stochastic and slow process of hydrate nucleation making it unstable and unpredictable in practice. To overcome this limitation, methane hydrate was synthesized in a silicon carbide (SiC) ceramic foam packing trays reactor without stirring. Results suggested that the packing trays should be located near the gas-water interface instead of immersed in the aqueous phase, which decreased the induction time by about 98%. Results also highlighted the synergistic effects between the capillary wicking from the porous packings and the water suction from the initially formed hydrate clusters, which pumped water from the aqueous phase into the packings’ pores to provide an unsaturated porous environment for hydrate nucleation. It demonstrated that these two driving forces might also compete for water which became adverse to hydrate formation.
研究领域:
化学工程
·
能源存储
·
材料科学
✓ 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）