JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 36
·47922
·
IF 2.188
Nan Pan,Juanrong Qin,Yuwei Fan,Zeke Li,Botao Song
In this study, mesoporous silica nanoparticles (MSNs) were embedded into the hydrophilic poly(vinyl alcohol) (PVA) nanofibrous mats to achieve sustained release of water soluble drug from hydrophilic nanofibrous mats. MSNs were successfully prepared based on a sol–gel method. Water soluble drug naproxen sodium was then loaded into the mesopores of the MSNs, and different amounts of the drug-loaded MSNs were further incorporated into the fibers by the electrospinning process. Morphology of the nanofibrous mats was investigated, and it was found that all the fibers exhibited fibrous structure. Interestingly, lots of protrusions could be observed from the scanning electron microscopy images with high magnification, and numbers of the protrusions increased with the increasing of loading ratios of the MSNs from 5 to 15%. In addition, the wetting behaviors of the nanofibrous mats were also measured, and the water contact angles of all the mats were measured to be 0°. Finally, the drug release results indicated that all the PVA/MSNs composite nanofibrous mats showed an obviously prolonged drug release. The optimal loading ratio of the MSNs in the nanofibers was 10% due to the slowest drug release rate. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47922.
研究领域:
药剂学
·
生物材料
·
纳米医学
·
药物递送系统
·
高分子科学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
Zhiyong Mao,Jingjing Chen,Liang Sun,Qifei Lu,Dajian Wang
(Ba,Sr) 3 MgSi 2 O 8 :Eu 2+ , Mn 2+ phosphors with 430/505/660 nm tri-bands or 430/660 nm dual-bands emission were demonstrated in this work by controlling the appearence or not of green emitting intermediate phases, (Ba,Sr) 2 SiO 4 :Eu 2+ . Through varying the stoichiometric amount of SiO 2 in precursor, the coexistence of green emitting intermediate phase tended to be sensitive and diversified. Laser Microzone Raman spectrum was employed to look insight into the lattice stretch and the preferential occupation sites of Ba 2+ ions in Sr 3 MgSi 2 O 8 lattices. The local structure and the crystal field of Eu 2+ luminescent centers were found to be disturbed by distorted arrangement of cross-linked [MgO 6 ] octahedra and [SiO 4 ] tetrahedra. This mechanism approach provided some new insights to further understanding the adjustment strategy of green emitting intermediate phases in (Ba,Sr) 3 MgSi 2 O 8 :Eu 2+ , Mn 2+ phosphor potentially applied as red/blue dual-bands emitting or red/green/blue tri-bands emitting materials.
研究领域:
材料科学
·
无机化学
·
发光材料
·
固体物理
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Juan Hong,Kun Cheng,Guiyin Xu,Myles Stapelberg,Yuan Kuai,Pengcheng Sun,Subing Qu,Zexin Zhang,Qidong Geng,Zhuangzhao Wu,Meifang Zhu,Paul V. Braun
Si/Cu/Zn ternary microspheres are prepared by a pulsed electrical discharging method in a scalable manner. Zn and partial Si within these microspheres can then be selectively removed by chemical etching to form Si/Cu nanowires. The Si/Cu (~62 atom% Si) nanowires show a high discharge capacity of 2092 mAh g −1 and a high capacity retention after 500 cycles at a current density of 200 mA g −1 . The excellent rate and cycling performance are attributed to the conductive Cu network and nanowire structure, which increases the electric conductivity of the electrode and accommodates the volumetric change of silicon during the charge/discharge process. Furthermore, the Si/Cu nanowire anode utilizes relatively cheap materials and flexible processing methods, costing approximately $0.3 g −1 . This work presents a novel method to prepare nanowire-like Si-based anode materials , which is promising to boost the yield of Si alloy NWs with low cost.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2018
·
IF 3.024
Di Wang,Shanshan Sun,Te Sha,Tongjing Liu,Honghong Dong,Kai Cui,Hailan Li,Yejing Gong,Jirui Hou,Zhongzhi Zhang,Pengcheng Fu
Wettability modification is one of the main mechanisms to increase oil recovery from low-permeability oil reservoirs. Nanofluids composed of nanoparticles can be used as modifiers to alter wettability from oil-wet to water-wet condition thus to promote hydrocarbon recovery. Biosurfactants, which are candidates to replace synthetic surfactants for industrial applications, have the potential to prepare nanofluids. In this study, nanofluids prepared by dispersing SiO2 nanoparticles in rhamnolipid solution (hereby named bionanofluids) were considered potential wettability modifiers to apply to petroleum recovery from low-permeability sandstone reservoirs. Analyses via visual observation, optical absorbance measurement, ζ-potential determination, and particle size measurements demonstrated that the bionanofluids with 25 ppm rhamnolipids maintained an optimal stability. The effect of bionanofluids on wettability alteration was investigated through contact angle measurement and imbibition test. The results showed that bionanofluids could alter the wettability of oil-wet sandstone to strongly water-wet. The best performance was achieved with a nanoparticle concentration of 1000 ppm. Additionally, a micromodel test using rhamnolipid solution and bionanofluid was carried out to evaluate the synergistic effects of SiO2 nanoparticles and rhamnolipid on displacing oil. Bionanofluid injection following biosurfactant flooding was shown to improve oil recovery, yielding an additional 5% production. These results reveal that the bionanofluid prepared with SiO2 and rhamnolipids not only remained stable but also provided a potential way for enhanced oil recovery.
研究领域:
石油工程
·
纳米技术
·
表面化学
·
提高采油率
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 7
·5927-5941
·
IF 2.993
Ma Jingyuan,An Yuxiu,Yu Peizhi
The copolymer (PAAN-SiO 2 ) of acrylamide (AM), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), N -vinylpyrrolidone (NVP) and modified nano-silica (M-SiO 2 ) was synthesized by free radical polymerization in a water solution. The composition, micro-morphology and thermal stability properties of PAAN-SiO 2 were characterized by Fourier transform infrared spectroscopy, thermal gravity analysis and transmission electron microscopy (TEM). The results showed that AM, AMPS and NVP were successfully grafted onto the surface of M-SiO 2 and formed a spherical core–shell structure copolymer. A significant reduction in the filtration volume was achieved after PAAN-SiO 2 added, and this phenomenon was even more pronounced after aging at the high temperature. The filtration volume of base slurry containing 2 wt% of calcium chloride after aging at 180 °C was reduced from 186 to 6 ml after adding 2 wt% of PAAN-SiO 2 , which exhibited a special property of anti-calcium contamination at high temperature. The interaction mechanism between PAAN-SiO 2 and bentonite and calcium ions was analyzed by particle size analysis, scanning electron microscopy, TEM and X-ray diffraction. Because of the stretching of polymer chain under 180 °C that more amide, sulfonic acid groups and cyclic rigid groups were exposed and the strengthening of the connection between PAAN-SiO 2 and clay prevents a large amount of ion exchange between Ca 2+ and clay layers, reducing the agglomeration of clay. Meantime, the distribution of clay particles was more extensive and some particles with a size of 1–10 μm plugged the micro-nano-pores on the filter cake, and eventually the thin and compact filter cake was formed.
研究领域:
高分子化学
·
石油工程材料
·
胶体与界面科学
·
功能纳米材料
·
钻井液添加剂
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
L. Shen,J. Yang,G. Liu,M. Avdeev,X. Yao
The low ionic conductivity and poor dendrites suppression capability of Na 3 Zr 2 Si 2 PO 12 solid electrolyte limit the practical application of all-solid-state sodium batteries . Herein, the optimized Na 3.4 Mg 0.1 Zr 1.9 Si 2.2 P 0.8 O 12 electrolyte is obtained by simultaneously substituting the Zr 4+ with Mg 2+ and P 5+ with Si 4+ through solid-state reaction. The Na 3.4 Mg 0.1 Zr 1.9 Si 2.2 P 0.8 O 12 electrolyte has superior room temperature ionic conductivity of 3.6 × 10 −3 S cm −1 , which is 17 times higher than that of pristine Na 3 Zr 2 Si 2 PO 12 . No short circuit of the Na/Na 3.4 Mg 0.1 Zr 1.9 Si 2.2 P 0.8 O 12 /Na symmetric battery is observed up to 2.0 mA cm −2 , and the symmetric battery displays stable sodium plating/stripping cycles for over 2000 h at 0.1 mA cm −2 and 300 h at 1.0 mA cm −2 . The resultant Na 3.4 Mg 0.1 Zr 1.9 Si 2.2 P 0.8 O 12 electrolyte is further employed in two all-solid-state sodium batteries. The Na 3 V 2 (PO 4 ) 3 /Na 3.4 Mg 0.1 Zr 1.9 Si 2.2 P 0.8 O 12 /Na all-solid-state sodium battery maintains a discharge capacity of 93.3 mAh g −1 at 0.1C after 50 cycles, and the FeS 2 /Na 3.4 Mg 0.1 Zr 1.9 Si 2.2 P 0.8 O 12 /Na all-solid-state sodium battery delivers a discharge capacity of 173.1 mAh g −1 at 0.1C after 20 cycles, which are significantly enhanced compared with those based on pristine Na 3 Zr 2 Si 2 PO 12 . This strategy provides an efficient method to prepare optimized NASICON solid electrolytes with high ionic conductivity and excellent dendrites suppression capability and promotes the practical application of all-solid-state sodium batteries.
研究领域:
材料科学
·
电化学
·
固态离子学
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2022
·
IF 5.477
Peizhi Cao,Zhe Wang,Liying Liu,Peng Gao,Guo Tian,Haoran Liu,Jiaxin He
Background Cobalt has a high polarizability and can form a high dispersion potential energy on the surface of zeolite, which is conductive to the capture of CO 2 . Methods For the first time, cobalt-silicon molecular sieves (CSMS) were synthesized by hydrothermal method using cobalt nitrate as the cobalt source and sodium silicate as the silica source without organic template. Significant findings The effects of pH values on the synthesis of molecular sieves were investigated, and the sample CSMS-12 which synthesized at pH = 12, showed the highest specific surface area and pore volume. The specific surface area (S BET ) and Total volume (V Total ) of CSMS-12 are 452.8 m 2 ·g −1 and 0.4 cm 3 ·g −1 , respectively. The result of adsorption test at 273 K and 100 kPa shows that CSMS-12 has the highest CO 2 uptake (1.86 mmol·g −1 ), and the Dual-site Langmuir isotherm model fits well with the experimental result. CSMS-12 has excellent adsorption selectivity (123) of CO 2 /N 2 calculated by IAST method. Furthermore, fixed-bed adsorption breakthrough experiments were carried out to investigate the performance of dynamic CO 2 /N 2 and CO 2 /CH 4 separation by CSMS-12 at different temperatures. The above results indicate that it can be applied to the separation of CO 2 in flue gas and biogas.
研究领域:
材料科学
·
环境化学
·
能源工程
·
吸附分离
·
多孔材料
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Shanghua Feng,Binbin Zhao,Lei Liu,Jinxiang Dong
Platinum-loaded WO3–Al2O3–SiO2 catalysts, denoted as Pt/WAlSi, in glycerol hydrogenolysis to 1,3-propanediol (1,3-PDO) with a batch reactor were investigated, wherein the WO3-doped silica–alumina material with a homogeneous dispersion was prepared by sol–gel method and Pt was loaded onto it by incipient wetness impregnation. The catalysts were characterized by powder XRD, N2 adsorption–desorption, TEM, CO chemisorption, NH3-TPD, Py-IR, and XPS. The WO3/Al2O3 ratio and Pt loading amount are shown to be of importance in determining the activity and directing the selectivity to 1,3-PDO. It was found that 2% Pt/WAlSi with the ratio of WO3 to Al2O3 at 2 has a suitable Brønsted acidity and contributes to a high selectivity to 1,3-PDO close to 56% at 48% glycerol conversion, and the space time yield for 1,3-PDO in an optimized reaction condition could reach 18.34 g/(gPt h), much higher than the best result reported in the literature. A plausible mechanism of glycerol hydrogenolysis was proposed from the reaction results.
研究领域:
催化化学
·
应用化学
·
材料科学
·
工业催化
·
绿色化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2017
·Vol. 8
·期 1
·4
·
IF 3.553
Peige Qin,Yixin Yang,Xiaoting Zhang,Jiahua Niu,Hui Yang,Shufang Tian,Jinhua Zhu,Minghua Lu
In this work, a highly efficient and rapid method for simultaneously removing cationic dyes from aqueous solutions was developed by using monodispersed mesoporous silica nanoparticles (MSNs) as the adsorbents. The MSNs were prepared by a facile one-pot method and characterized by scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy, and Brunauer-Emmett-Teller. Experimental results demonstrated that the as-prepared MSNs possessed a large specific surface area (about 585 m2/g), uniform particle size (about 30 nm), large pore volume (1.175 cm3/g), and narrow pore size distribution (1.68 nm). The materials showed highly efficient and rapid adsorption properties for cationic dyes including rhodamine B, methylene blue, methyl violet, malachite green, and basic fuchsin. Under the optimized conditions, the maximum adsorption capacities for the above mentioned cationic dyes were in the range of 14.70 mg/g to 34.23 mg/g, which could be achieved within 2 to 6 min. The probable adsorption mechanism of MSNs for adsorption of cationic dyes is proposed. It could be considered that the adsorption is mainly controlled by electrostatic interactions and hydrogen bonding between the cationic dyes and MSNs. As a low-cost, biocompatible, and environmentally friendly material, MSNs have a potential application in wastewater treatment for removing some environmental cationic contaminants.
研究领域:
环境科学
·
纳米材料学
·
吸附科学
·
水处理技术
·
胶体与界面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 32
·11901-11907
·
IF 5.101
Shengyang Tao,Yuchao Wang,Yonglin An
Monolithic silica with macroporous skeleton and well-defined mesopores was prepared via sol–gel method by using triblock polymer P123 as the structure directing agent and tetramethoxysilane (TMOS) as the silicon source. The large macroporous channels (3 μm in diameter), formed by phase separation and sol–gel transition, ensure the substances diffuse in the bulk easily. Appropriate specific area (nearly 400 cm2 g−1) and mesopores (17.67 nm in diameter and 1.99 cm3 g−1 in volume) supply enough space for storing the molecules absorbed. After grafting organic groups on their surface, hydrophobic monolithic hierarchically porous silica (MHS) could be prepared with high capability to adsorb oils and organic contaminants on the surface of water without coadsorption. In order to explore the factors impacting the ability of adsorption, a series of properties are characterized including the BET surface, porous size and water contact angle by changing the type and dosage of modifying agents. The maximum absorptive ability can reach 8 times the monolith's weight, and materials could be recycled more than 20 times by an easy treatment. Good selectivity, better thermal stability, easy removing and excellent recyclability for oil removal give the material potential applications.
研究领域:
材料科学
·
环境工程
·
纳米技术
·
表面化学
·
多孔材料
✓ 已验证
DOI
高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2020
·
IF 5.627
Zeyun Wu,Yiyang Zhang,Xiaofan Zhao,Hongyan Wang,Shuiqing Li
Yttrium aluminum oxide YAlO 3 is an attractive laser host material for lanthanide ions like Nd 3+ . In this paper, a dual liquid/vapor-fed flame synthesis (DLVF) system is developed for investigating the role of SiO 2 coating on flame-made YAlO 3 :Nd 3+ nanophosphors. The hexamethyldisiloxane (HDMSO) vapor is flexibly fed into the YAlO 3 :Nd 3+ flame spray flow at different positions and molar ratios . We find that the introduction of SiO 2 coating dramatically improves the crystallinity of YAlO 3 :Nd 3+ cores because of the heat-insulation effect and nearly doubles the fluorescence intensity . Through a timescale analysis, we demonstrate that the best timing for coating injection is when the small particles have already been formed but not heavily aggregated. An early injection could result in segregated SiO 2 particles and some impurities like Al 2 SiO 5 , while a delayed injection leads to the coating of SiO 2 on the entire aggregates instead of on individual particles. Experiments of different coating ratios show that the coating ratio 1:1 of Si:(Y+Nd) produces the best crystallinity and strongest fluorescence intensity. Further increase of the coating ratio does not show any improvements of the crystallinity , and may even causes the decrease of the relative fraction of Nd 3+ ions. Compared with YAG:Nd 3+ bulk materials (with a typical optimum doping concentration 1.1mol%) and uncoated YAlO 3 :Nd 3+ nanophosphors (with an optimum doping concentration 2 mol%), the SiO 2 coating promotes the optimum Nd 3+ doping concentration up to 3 mol%.
研究领域:
材料科学
·
无机化学
·
纳米技术
·
发光材料
·
激光增益介质
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2022
·Vol. 7
·期 4
·1084-1092
·
IF 6.813
Muhammad K. Majeed,Rashid Iqbal,Arshad Hussain,Mina Lotfi,M. Umar Majeed,M. Zeeshan Ashfaq,M. Sufyan Javed,Muhammad Ahmad,Adil Saleem
Through collective use of experimental investigation and theoretical approaches, i.e., X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, microscopic properties and density functional theory (DFT) calculations, we comprehensively characterize the structural, morphological, and lithium (Li) storage performance of double-shelled silicon@ZIF-8@ZIF-67 (Si@DNC). The unique architectures not only absorb the huge volume variation stress of Si during cycling but also provide enhanced electrical conductivity and manipulate the stability and integrity of a well-wrapped double-shelled framework. Additionally, N-doped carbon can also enhance the conductivity of electrodes. The superior Li storage performance in double-shelled structures is refined via an interactive lithiation/delithiation approach and validated using DFT calculations. Typically, the as-prepared Si@DNC delivered enhanced cycling stability with a high discharge capacity of 2537.8 mA h g−1 in the first cycle and 1285 mA h g−1 after 200 cycles at 200 mA g−1. Therefore, the double-shelled structure reflected outstanding electrochemical performance and is expected to be a forthcoming candidate for anode materials in next-generation lithium-ion batteries (LIBs).
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
计算材料学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）