JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Kui Yin,Shanshan Zhang,Yuyang Sun,Hui Huang,Yafei Cheng,Fan Liao,Mingwang Shao
Hydrogen is considered as a promising energy source because of its high combustion heat and clean products. Among the various hydrogen evolution methods, electrocatalysis is the most convenient and effective way. However it is still problematic to find low-cost and high-efficiency electrocatalysts. In this work, Os-Ag-Si and Os-Au-Si ternary electrocatalysts were investigated. It is interesting that Os-Ag-Si exhibits higher hydrogen evolution performance than that of Os-Au-Si, even though Ag is a worse HER catalyst than Au. The optimal ternary catalyst Os-Ag-Si with mass ratio of 15:15:70 (Os:Ag:Si) was synthesized by a facile Si H bond reduction method, which shows superior hydrogen evolution reaction performance with a low Tafel slope of 40 mV·dec −1 . In addition, the current density of Os-Ag-Si-15 catalyst surpasses that of 20% Pt/C when the overpotential is larger than 160 mV. The introduction of Ag in the Os-Ag-Si ternary catalyst could enhance the electrocatalytic activity, reduce the cost of catalysts, and even be better than Os-Au-Si.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Xue Tian,Shuang Wang,Jinsheng Li,Fengxiang Liu,Xu Wang,Hao Chen,Hongzhe Ni,Zhe Wang
Polybenzimidazole (PBI)/ionic liquid (IL) functional Si–O–Si network composite membranes are prepared from PBI with 1-(3-trimethoxysilylpropyl)-3-methylimidazolium chloride. The IL can be hydrolyzed to form Si–O–Si network structure under acidic conditions. And such IL functional Si–O–Si network (NP) in the composite membranes could improve phosphoric acid doping levels and proton conductivities simultaneously. The ability of retaining more PA is also reflected in the high proton conductivity value of PBI/NP-15% membrane which shows almost three-fold increment compared to the pristine PBI. All the PBI/NP-X composite membranes display excellent chemical stability and improved mechanical strength . This is attributed to Si–O–Si network structure. Moreover, PBI/NP composite membranes have demonstrated high thermal stability up to 250 °C, which is attractive for high-temperature (>200 °C) proton exchange membrane fuel cells.
研究领域:
材料科学
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
Current Drug Delivery
·
2018
·Vol. 15
·期 4
·585-593
·
IF 2.078
Su Qin,Pu Ximing,Bai He,Chen Xianchun,Liao Xiaoming,Huang Zhongbing,Yin Guangfu
Background: Liposomes have been widely used in gene transfection and drug delivery systems due to their excellent biocompatibility and encapsulation ability, especially, the ability to deliver the gene/drug into the cells via the membrane fusion. Thermosensitive liposomes have
been proven to be a precise and effective method for cancer treatment in many preclinical studies. But the imperfect crystalline arrangement between grains occurred, resulting in planar defects at the boundaries of membranes, compromising the stability of thermosensitive liposomes. Objective:
In the present study, we developed a facile method to improve the stability of ordinary thermosensitive liposomes by introducing organic-inorganic hybrid materials with local Si-O-Si net. Method: A cerasome forming lipid, N, N-Dihxadecyl-N'- [(3-triethoxysilyl) propyl] urea, was synthesized
and then introduced into the thermosensitive lipids to form the composite liposomes (named as cera-liposomes). The effects of the cerasome forming lipid on the cera-liposomes characteristics, including the morphology, drug loading, Zeta potential and stability of vesicles, were investigated.
Results: Cera-liposomes were thermosensitive, and they had a loading efficiency over 2 folds more than conventional thermosensitive liposomes. With the enhanced sustain of Si-O-Si, cera-liposomes were able to avoid collapsing and fusing during storage, and had a good resistance to nonionic
surfactant. More than 80% drug was still retained after storage of 15 days at room temperature. Conclusion: The cerasome forming lipid showed potential in improving the stability of thermosensitive liposomes. This novel kind of cera-liposomes could be a stable and effective drug carrier
for anticancer applications.
研究领域:
药剂学
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生物材料学
·
肿瘤治疗
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Qibing Wang,Luman Liu,Jianlong Wang,Wanjing Luo,Ren Wang,Lili Chen,Jinsheng Sun,Jie Yang,Huicui Sun,Fulong Peng,Jianhua Guo
Deep and ultra-deep drilling operations face significant challenges such as high temperatures and salinity levels. Drilling fluids are prone to failure under these conditions, causing increased filtration loss and frequent downhole accidents. To address these critical issues, this study utilised the high-temperature-stable adsorption properties of siloxanes to synthesise a multi-target adsorption-type fluid filtrate reducer, PFS-1. The molecular structure and thermal stability of PFS-1 were characterised using 1 H NMR, Fourier transform infrared spectroscopy and thermogravimetric analysis. Its effects on the microstructure of drilling fluid were investigated using scanning electron microscopy, X-ray diffraction and zeta potential analysis, thereby elucidating the interaction mechanism between PFS-1 and clay particles. Experimental results demonstrate that PFS-1 possesses excellent thermal stability, with a decomposition onset temperature exceeding 318°C. After thermal ageing at 240°C for 16 h and 72 h, the filtration loss of drilling fluid containing 2 wt% PFS-1 was 9.1 mL and 9.7 mL, respectively. Additionally, in a 15 wt% NaCl brine-based drilling fluid system, the API filtration loss was just 5.6 mL after ageing at 220°C with 2 wt% PFS-1. Results confirm the superior high-temperature resistance and salt tolerance of the novel filtration reducer. Through the synergistic effect of Si–O–Si chemical adsorption and ionic bonding, PFS-1 forms a stable multi-point adsorption on the surface of the clay particles, inhibiting their hydration and aggregation and thereby reducing the fluid filtration loss. Furthermore, the performance of PFS-1 was improved by 18.75 % compared to that of commercial products, indicating its strong potential for application in demanding drilling environments characterised by ultra-high temperatures and high salinity.
研究领域:
石油工程
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材料科学
·
化学工程
·
应用化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 4
·1623-1628
·
IF 8.867
Binbin Jiang,Yuyang Sun,Fan Liao,Wen Shen,Haiping Lin,Hui Wang,Mingwang Shao
Hydrogen production with the aid of electrocatalysis is a critical component for several developing clean-energy technologies. Such a renewable energy depends heavily on the choice of cheap and efficient catalysts for hydrogen evolution, which has still been a challenge until now. In this work, the theoretical calculation indicates that Rh–Ag–Si ternary catalysts exhibit more active hydrogen evolution performance than Pt–Ag–Si because the migration activation energies of H atoms from Rh(111) to Si are lower than those from Pt(111) to Si via the Ag surface. This simulation was confirmed by the experimental results: Rh–Ag/SiNW (or Pt–Ag/SiNW) catalysts were prepared by directly reducing Rh (or Pt) and Ag ions with Si–H bonds. The Rh–Ag/SiNW-2 with the optimal mass ratio of 2.3 : 23.4 : 74.3 (Rh : Ag : Si) exhibited a lower Tafel slope (51 mV dec−1) and a larger exchange current density (87.1 × 10−6 A cm−2) than the Pt–Ag/SiNW. In addition, the mass activity of Rh–Ag/SiNW-2 at an overpotential of 0.2 V (11.5 mA μgRh−1) is 12.0, 5.0 and 3.3 fold higher than that of Rh–Ag (0.96 mA μgRh−1), Pt–Ag/SiNW (2.3 mA μgPt−1) and 40 wt% Pt/C (3.5 mA μgPt−1) catalysts, respectively. Moreover, the Rh–Ag/SiNW nanocatalysts had good stability in acidic media. The results presented herein may offer a novel and effective methodology for the designing of cost-efficient and environmentally friendly catalysts for electrochemical fields.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yu Wang,Hang Zhang,Dingmei Han,Meiyu Liu,Binbin He,Yun Zu
Cobalt (Co)-based zeolite catalysts are promising alternatives to replace expensive Pt- and toxic Cr-based catalysts for direct propane dehydrogenation (PDH). However, identifying the interaction between Co species and surface Si-hydroxyls of siliceous zeolites has been an inevitable challenge to realize the controllable construction of the Co species as dehydrogenation sites. Herein, we have fabricated a series of Co/Si-Beta(m-n) catalysts by using the dealuminated Si-Beta zeolites with “on-purpose” quantifying different type of Si-hydroxyls, involving geminal silanols ( g -SiOH), vicinal silanols ( v -SiOH) and silanol nests ( n -SiOH). In comparison to ultra-small CoO x nanoparticles (< 1.0 nm) directly trapped by the n -SiOH structure, a moderate interaction was built between tetrahedrally-coordinated divalent CoO x nanoparticles (∼4.5 nm) and external n -SiOH structure, resulting from partial migration and aggregation of initial CoO x species preferentially captured with g -/ v -SiOH structures during H 2 reduction. Given this, a representative Co/Si-Beta(500–12) catalyst exhibited a high catalyst productivity of 29.22 mol/g-catalyst (the product of initial reaction rate and the inverse of deactivation coefficient) with about 96 % propylene selectivity. In-situ FTIR spectra further revealed that such superior PDH performance was attributable to the moderately interaction of defined Si-O-Co structure that could be conducive to form the 2-propyl intermediate product, supporting the production of propylene and H 2 . These findings provide a novel inspiration for the development and optimization of low-cost, ecofriendly and advanced PDH catalysts.
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
MOLECULES
·
2025
·Vol. 30
·期 16
·3319
·
IF 4.6
Tong Chang,Renhui Deng,Jiaxin Xie,Jianyu Tang,Wenyao Gu,Zimin Peng,Suyao Liu
The abundant Si-OH groups serving as the defect sites in the ZSM-22 zeolite framework are not only closely associated with physicochemical properties and catalytic performance but are also the primary sites for attack by water molecules, thereby restricting applications involving or producing water. In the present study, a liquid-mediated healing process was used to convert the Si-OH groups in ZSM-22 zeolite into Si-O-Si bonds. The systematic investigation of the treatment solution’s composition and the hydrothermal conditions revealed that the crystallinity of ZSM-22 zeolite can be effectively enhanced following optimal healing treatment. Furthermore, the healed ZSM-22 zeolite exhibited enhanced ordering degree and pore connectivity without significant changes to the Si/Al and morphology. Moreover, the decline in Si-OH groups reduced the Lewis acid sites without altering the Brønsted acidity, which led to a slight decrease in the dispersion of Pt particles. In n-decane hydroisomerization, compared to the parent ZSM-22 zeolite catalyst, the healed catalyst demonstrates higher reactant conversion and increased isomer yield, attributing to its enhanced confinement within the micropore voids, which leads to a reduced yield of multi-branched isomers susceptible to cracking. This study presents a potential application of ZSM-22 zeolite in hydroisomerization for complex and challenging feedstocks.
研究领域:
催化化学
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材料科学
·
化学工程
·
石油化工
·
沸石化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2012
·
IF 3.456
Wantong Song,Chunsheng Xiao,Liguo Cui,Zhaohui Tang,Xiuli Zhuang,Xuesi Chen
Construction of high density glycosylated surfaces is important in the investigation of interactions between pathogens and surface carbohydrates. In this work, we provided a flexible method for glycosyl surface fabrication by combination of surface-initiated atom transfer radical polymerization (SI-ATRP) and copper-catalyzed azide-alkyne 1,3-dipolar cycloaddition (CuAAC) reaction. Through this strategy, we got a very high surface glycosyl density of about 4 nmol/cm 2 with the surface “click” efficiency of nearly 50%. Then the carbohydrate decorated surfaces were used to mimic cell surfaces and specific recognition of mannose with Escherichia coli was observed. We believe the methodology provided here can be used as a facile way for construction of a wide range of functional biosurfaces.
研究领域:
生物化学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2020
·Vol. 78
·期 1
·335-358
·
IF 2.014
Yuan Haikuan,Wang Chengchong,Liu Xiaodi,Lu Jie
In order to ameliorate the trade-off effect in pervaporation process and to reduce the micro-phase separation of hybrid membrane, polyvinyl alcohol (PVA)-perfluorosulfonic acid (PFSA) blending materials were modified by two inorganic components to prepare PVA-PFSA-Si hybrid membrane. PVA-PFSA-Si membrane was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), contact angle measurements, scanning electron microscopy (SEM), positron annihilation lifetime spectrometer (PALS) and swelling measurements. As a second inorganic modifier, the effect of γ-glycidyloxypropyl trimethoxysilane (GPTMS) on the morphology of hybrid membrane was better than that of γ-aminopropyl triethoxysilane (APTEOS). PVA-PFSA-Si/polyacrylonitrile (PAN) composite membrane was used to pervaporatively dehydrate ethyl acetate (EAc)/H 2 O binary, EAc/ethanol (EtOH)/H 2 O ternary EAc/acetic acid (HAc)/EtOH/H 2 O quaternary solutions. At feed temperature of 40 °C, M8 membrane had the permeation fluxes ( J ) of 262.7, 215.2 and 182.6 g m −2 h −1 and the separation factors ( α ) of 6673, 3453 and 5374 for pervaporative dehydration of EAc/H 2 O (98/2, wt%) binary, EAc/EtOH/H 2 O (96/2/2, wt%) ternary and EAc/HAc/EtOH/H 2 O (96/1/1/2, wt%) quaternary solutions, respectively. The pervaporative results showed that PVA-PFSA-Si membrane had the excellent dehydration performances for EAc binary or multicomponent aqueous solutions.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zigui Luo,Xi’an Fan,Wentao Hu,Fan Luo,Jian Wang,Zhaoyang Wu,Xin Liu,Guangqiang Li,Yawei Li
In this work, Fe–Si/Fe 2 SiO 4 soft magnetic composites (SMCs) are prepared successfully via sintering Fe-6.5 wt%Si/α-Fe 2 O 3 core-shell composite powders obtained by ball milling. The transformation mechanism from Fe-6.5 wt%Si/α-Fe 2 O 3 to Fe–Si/Fe 2 SiO 4 is revealed in detail. The effect of α-Fe 2 O 3 coating content on microstructure and magnetic properties for the Fe–Si/Fe 2 SiO 4 SMCs is also investigated. During the high temperature sintering process, α-Fe 2 O 3 coating will in situ react with diffused Si from Fe–Si alloy cores, and result in the generation of Fe 2 SiO 4 insulating layer and Fe atoms. When the α-Fe 2 O 3 coating content increases from 0.0 wt% to 7.5 wt%, the insulating layer becomes thicker. Nevertheless, with further increasing the α-Fe 2 O 3 coating content from 7.5 wt% to 12.5 wt%, the generation of excessive Fe breaks the continuity of the insulation layer. As a result, the saturation magnetization decreases gradually, while the coercivity exhibits an opposite trend. The core loss decreases firstly and then increases. Therefore, the Fe–Si/Fe 2 SiO 4 SMCs coated with 7.5 wt% α-Fe 2 O 3 exhibit superior comprehensive performance such as very low core loss (39.6 mW/cm 3 at 50 kHz), very high saturation magnetization (191.4 emu/g) and stable permeability (44) from 50 Hz to 200 kHz.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
WEAR
·
2015
·
IF 1.913
Z.C. Lu,M.Q. Zeng,Y. Gao,J.Q. Xing,M. Zhu
In this work, an attempt was made to further promote the wear and friction behavior of dual-scale structured Al–12 wt% Sn bearing alloys by coupling with a nano-Si@Sn composite. A so-called tri-modal Al–Sn–Si (denoted as CG-30 Si-containing alloy), which exhibited increased bulk hardness and improved distribution and refinement of the Sn phase, was produced by combining mechanical alloying and conventional powder sintering. The wear performance of the Si-containing and Si-free alloys was differentiated by performing both block-on-ring and ball-on-disk testing. Moreover, the addition of nano-Si@Sn composites to the dual-scale Al–Sn matrix resulted in significant reductions of the friction coefficient and wear volume. These improvements in wear behavior stemmed from the polishing effect of fine Si particles on the counterface , and Sn-rich clusters that acted as lubricants on the worn surface; together, the polishing effect and lubrication led to the formation of a smooth tribolayer, and hence, a decrease in the tendency for abrasive wear . Abrasive wear was also reduced by an increase in the alloy hardness with the addition of Si. As such, Sn-phase modification via Si addition constitutes a promising method for preparing self-lubricating Al-based alloys.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 19
·6796-6800
·
IF 0
Yusheng Xia,Xuxin Pu,Jie Liu,Jie Liang,Pujun Liu,Xiaoqing Li,Xibin Yu
Various-sized arrays of CuO nanoleaves (NLs) were fabricated on a pyramid-textured c-Si wafer. The CuO NL/c-Si solar cells show a great increase of the optical absorption and a reduction of the reflectance in the 250–1250 nm wavelength range, compared to the reference one. The c-Si solar cell integrated with CuO NLs generates the graded index of refraction between the surface of Si and air, and improves the light utilization efficiency by increasing the light-trapping effect and forming resonant optical modes, which leads to multiple scattering of the incident light. In addition, the deposition of p-type CuO NLs on the surface of the Si wafer can form a CuO NL/c-Si junction and generate a built-in potential, which is beneficial for the separation of photogenerated electrons and holes, leading to the minority carrier lifetime (τeff) increase from 5.7 to 15.0 μs. The CuO NL/c-Si structure reduces the optical loss, improves the carrier collection, and distinctly enhances the c-Si solar cell efficiency. The experimental results indicate that short-circuit current and power conversion efficiency of CuO NL/c-Si solar cells increase by 10.30% and 17.90%, respectively. The CuO NL/c-Si structure is expected to exceed the Shockley–Queisser limit of the single junction solar cells.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
危险品化学品经营许可证（带存储）