Colloid and Interface Science Communications
·
2020
·
IF 2.831
Gaoqi Wang,Lei Chen,Ding Weng,Jiadao Wang
The purpose of the work is to evaluate the effect of extracellular polymeric substance (EPS) on the surface properties of Streptococcus mutans , and on the interaction between the bacteria and anti-adhesion nanostructured surfaces. Interactions between Streptococcus mutans with or without EPS and nanostructured surfaces were measured with atomic force microscope. Acid-base, Van der Waals, and electrostatic interactions were evaluated according to XDLVO theory. The absorption of glucan was evaluated by quartz crystal microbalance method. Results indicate Streptococcus mutans adhere stronger on surfaces with lower surface energy in both EPS and non-EPS conditions, because acid-base interaction is dominant. It indicates the superhydrophobic surface is lack of durability and reliability in the underwater anti-adhesion. Larger adhesion forces of Streptococcus mutans are shown in EPS than non-EPS conditions. That is due to more hydrogen bonds formed between glucan and substrate surfaces, and the EPS reducing surface energy and affecting acid-base interaction.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 1
·1-14
·
IF 2.8
Zhang Yajuan,Lu Yang,Shan Yiting,Wang Jie,Feng Jingmin,Zhou Hongqing
Herein, (1 − x )CaO–Al 2 O 3 –B 2 O 3 –SiO 2 (CABS)/ x Ba(Mg 1/3 Nb 2/3 )O 3 (BMN; x = 0.4, 0.45, 0.5, 0.55, and 0.6) composites were prepared, and the impact of the BMN and low-softening-point glass content in CABS/BMN composites on the sintering, dielectric, thermal, and mechanical properties of the prepared composites was investigated. The main crystal phases of the CABS/BMN composites are BMN and Ba 2 NaNb 5 O 15 (BNN). The crystallization temperature of the composite was reduced by an appropriate amount of BMN. BMN ceramics (40–60 wt%) was added to the CABS glass, and the composites were sintered at 800 °C, 825 °C, 850 °C, 875 °C, and 900 °C. To elucidate the influence mechanism of different glass contents and sintering temperatures on the properties of the composites, different qualitative and quantitative instruments were used to study the composite properties. The CABS/BMN composite containing 50 wt% CABS glass sintered at 875 °C exhibits the following ideal properties: volumetric density of 3.57 g/cm 3 , dielectric constant of 17.97, dielectric loss of 6 × 10 −4 , \(Q \times f\) value of 10,947 at 9.5 GHz, bending strength of 157.7 MPa, and coefficient of thermal expansion of 5.9 ppm/K. Microstructure analysis reveals that the microstructure of the composite is dense, the pores are few, the surface morphology is uniform and flat, and the composite does not react with silver electrodes, making it suitable for applications utilizing medium dielectric constant low-temperature co-fired ceramic materials at low sintering temperatures.
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高影响因子
SOLAR ENERGY
·
2024
·
IF 6
Junhan Xu,Binghong Chen,Kunpeng Yuan,Jun Shu,Qiguo Yang
Ag@SiO 2 nanofluid is widely used in spectral splitting PV/T system. Its core–shell structure has great influence on the optical properties. In this work, we focus on the comprehensive analysis and structure optimization of Ag@SiO 2 nanofluid to achieve its optimal spectral performance. DDA method is used to predict the optical properties of Ag@SiO 2 nanofluid and an optimization model based on filter efficiency is proposed. The effect of the SiO 2 shell thickness and Ag core mass concentration is analyzed. It indicates that the spectral performance of Ag@SiO 2 nanofluid can be improved with SiO 2 shell thickness of 15–40 nm and Ag core mass concentration of 81–135 mg/L. To achieve the same theoretical merit function of 1.46, the usage of Ag mass can be reduced by 25/33/44/62 % with SiO 2 coating of 10/20/40/70 nm. The optimal structure to achieve the highest filter efficiency η of 37.8 % is with a shell thickness of 20 nm and a mass concentration of 113.9 mg/L. An indoor PV/T operation testing is conducted to verify the optimization results. The merit function of Ag-based nanofluids increases from 1.58 to 1.598 and a reduction in Ag usage of 17 % is achieved with a SiO 2 coating shell of 17.8 nm. Operation stability is also enhanced with no aggregation observed during the working cycle and 7-day static experiment.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Haiyan Wang,Linrui Bai,Shaolong Zhong,Qian Yang,Zhimin Dang
Dielectric capacitor is an important component of power systems , but its low dielectric polarization and undesirable dielectric loss have still held back the development of miniaturized microelectronic devices. Hence, we reported core@shell structured fillers with a conducting material@insulating material double-shell to improve the dielectric performance of the poly (vinylidene fluoride) (PVDF) composites. The hybrid fillers introducing ultra-short carbon nanotube (SSCNT) as an inner layer between BaTiO 3 (BT) as a core and silica (SiO 2 ) as an outer shell were synthesized. As the thickness of the insulating shell is enough thin, the BT@SSCNT@SiO 2 /PVDF composites exhibit an enhanced dielectric constant and a concurrently suppressed dielectric loss with the decreasing thickness. The composite incorporating the filler with the thinnest SiO 2 shell has the highest dielectric constant of 12.27 and the lowest dielectric loss of 0.023 at 20 wt% filler loading where the breakdown strength is about 15 less than the maximum value of 192.5 kV/mm. Furthermore, the hybrid fillers endow the composites with impressively stable dependence on frequency in a wide range of 10 2 ∼10 5 Hz. The achievement can be ascribed to the conducting property of the SSCNT inner layer and the suitable thickness of the insulating outer layer. They can synergetically provide the composites with an optimized polarization effect at a broad frequency resulting from the improved electrical field. This work reveals that a proper structure of the core@conducting material@insulating material core@double-shell filler can be an approach to optimize the overall dielectric performance of the polymer-based composites with high energy storage density .
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高影响因子
COMPOSITE INTERFACES
·
2022
·
IF 2.839
Zhigang Liu,Yuantao Xie,Lirong Yang,Chunmei Wang,Xiaoxin Feng,Zezheng Tang,Yaxin Yu
The polypropylene (PP) fibers were modified by silane coupling agent (KH570) or synergistically modified by KH570 and nano-SiO2 in this paper. The modification effect of PP fibers was evaluated by SEM and FTIR. The reinforcing effect of PP fibers and the modified PP fibers on sulphoaluminate cement-gypsum composites (SGC) was investigated. The results show that KH570 can undergo an autohydrolysis reaction and wrap on the surface of the PP fibers, which makes the hydrophilicity of PP fibers improved. Nano-SiO2 can further improve the hydrophilicity and roughness of the PP fiber surface by polycondensation reaction with KH570. KH570 and nano-SiO2 synergistically modified PP (KH570-SiO2-PP) fibers obviously increase the compressive strength and flexural strength of the hardened SGC compared with PP fibers or KH570 modified PP (KH570-PP) fibers. The SEM images show that PP-KH570-SiO2 fibers have better adhesion with the matrix than PP fibers and KH570- PP fibers.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 29
·e52648
·
IF 3.057
Zhonglan Cui,Yan Zhang,Chenkai Zhu,Lixiang Song,Jicheng Wang,Qianhong Jin,Qunchao Su,Dongming Qi
The dispersion and orientation arrangement of functional polymers with fillers are critical to their performance. However, there are rare detailed researches on the visualization of the orientation process about functional fillers in composite melts and the mechanistic effects on performance. In this work, it explored the change process of the orientation morphology for polyacrylate/silica (PAcr/SiO 2 ) composite microspheres in polymethyl methacrylate (PMMA) at different melting temperatures. Afterwards, the morphology and distribution of oriented microfibers in composite fibers melted at different temperatures were observed by transmission electron microscope (TEM). The results showed that composite microfibers could be formed in tight arrangement and obtained average orientation of 50.88 in the composite fibers at 250°C. Under this circumstance, the addition of nano SiO 2 particles had no effect on the rheological type. Meanwhile, the shear stress was 99.29% higher than that of pure PMMA system under the same conditions. As for the elongation at break, it was found that the elongation at break of the composite fiber prepared at 250°C was 169.43% higher than that of pure PMMA. Therefore, it provided a new method to achieve well dispersion of functional fillers in molten systems. Furthermore, it was beneficial to enhance the elongation at break of functional composites.
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高影响因子
Journal of Surface Investigation
·
2019
·Vol. 13
·期 6
·1192-1198
·
IF 0
Neshchimenko V. V.,Mikhailov M. M.
The reflectance spectra of ZnO, TiO 2 , and SiO 2 micro-, nano-, and hollow powders after their exposure to 100-keV protons are analyzed at wavelengths between 250 to 2500 nm. The hollow particles are up to 5 μm in size with a specific surface area of 32 to 57 m 2 /g. It is established that hollow particles have a greater radiation stability to proton exposure than microcrystal particles. The effect is due to the absence of radiation-induced defects in the volume of the spherical particles, low ionization losses, and a high ability to relax radiation-induced defects in the thin layer of the sphere.
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Journal of Cleaner Production
·
2025
·
IF 10
Dongyu Chen,Meizhu Chen,Xiangming Zhou,Shouwei Jian,Jianwei Zhang,Xinkui Yang,Yuechao Zhao
Minimizing indoor temperature fluctuations reduces dependence on heating and cooling systems, thereby lowering building energy consumption and carbon emissions and subsequently helping tackle global climate challenges. In this study, phase change capsules (PCCs) based on waste cooking oil derivative, Ca-alginate and nano SiO 2 were developed for foamed concrete (FC). The effects of nano SiO 2 dosage on PCC morphology, durability, thermal stability, and heat storage performance were systematically investigated. The distribution of PCCs within FC and the mechanical and thermal regulation properties of FC containing PCC were evaluated. The experimental results indicate that PCCs with 2 wt% nano SiO 2 exhibit a compressive strength of 26.29 N at 15 °C, the thermal decomposition onset above 200 °C with a notable mass loss of 40 %, and phase change enthalpy and temperature are 68.86 J/g and 20.1 °C, respectively. Ca-alginate/nano SiO 2 PCCs were uniformly dispersed and structurally intact within the FC matrix. Incorporation of 3 wt% Ca-alginate/Nano SiO 2 PCCs led to a 10.8 % reduction in compressive strength while exceeding the minimum strength requirements (>8.13 MPa) and achieving a 3.6 °C reduction in FC temperature variation. This study offers a sustainable strategy for improving building energy efficiency while promoting the recycling of waste cooking oil.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·Vol. 42
·期 6
·7373-7379
·
IF 2.758
Dezhi Hu,Zhihong Li,Yumei Zhu
The synergistic effect of ZnF 2 –TiO 2 –SiO 2 and seeds on the sintering behavior and microstructure of corundum abrasive was investigated. Significant improvement on microstructural homogeneity, densification and mechanical property was achieved by the co-doping and two step sintering (TS) for the abrasive samples. All the doped samples showed relative densities higher than 98% and single particle compressive strengths larger than 30 N. Besides, the two-step sintering samples attained smaller particle sizes, slightly higher densities, and narrower particle size distributions . Sample sintered by TS method with MgTiO 3 seed and the addition of ZnF 2 /TiO 2 /SiO 2 in the molar ratio of 5:7:5 obtained single particle compressive strength of 56.3 N, theoretical density of 99.4% and an average grain size of 0.46 μm. The phase transformation temperatures of doped samples were much lower than that of un-doped ones and they dropped significantly as the content of ZnF 2 raised. The relationship between microstructure and mechanical properties was also discussed.
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高影响因子
Journal of Energy Storage
·
2026
·
IF 9.8
Hu Wang,Shala Yang,Pengfei Pang,Jiangchao Chen,Yongbo Yan,Mingjie Liao,Dazhi Pang,Zheqi Zhang,Yunyun Zhao,Wenping Liu,Huarui Xu,Guisheng Zhu,Kunpeng Jiang
Poor interfacial stability and dendrite penetration at the lithium metal anode interface are critical bottlenecks hindering the practical application of garnet-type solid electrolytes, despite their high intrinsic ionic conductivity. Herein, we resolve this long-standing trade-off by designing a hierarchical sandwich heterostructure. This architecture comprises a dense Li 6.4 Ga 0.2 La 3 Zr 2 O 12 (C-LGLZO) ceramic scaffold sandwiched between two ZIF-8@SiO 2 /PVDF-HFP (ZSPH) composite interfacial layers. The resulting composite solid electrolyte (CSE) C-LGLZO/ZSPH exhibits exceptional electrochemical properties: a high Li + transference number (t Li+ = 0.77) and an outstanding ionic conductivity of 1.31 × 10 −3 S cm −1 at 30 °C. Mechanistically, while the robust central C-LGLZO scaffold provides a continuous Li + pathway and physically blocks dendrites, the honeycomb-like porous ZSPH interfacial layers homogenize the interfacial electric field and promote a stable solid electrolyte interphase (SEI). This synergistic design endows the CSE with a wide electrochemical stability window (4.8 V vs. Li/Li + ) and enables stable Li plating/stripping for over 1000 h. Furthermore, cells using a LiFePO 4 cathode retain 76.3 % of their capacity after 500 cycles at 0.5C, demonstrating exceptional high-rate cycling stability. This work offers a versatile architectural strategy for engineering robust solid-state batteries (SSBs).
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产品关联
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2026
·
IF 6.6
Ya-Nan Li,Bo-Han Zeng,Yu-Lin Yuan,Huan Xiong,Ye Tan,Jin Hu,Lin-Ping Yu,Ju-Lan Zeng
Silica-based functionalized composite aerogels possess the merits of high porosity and versatile properties, and can be utilized as a matrix for lots of applications including shape-stable phase change materials (SSPCMs). In-situ functionalization of silica-based aerogel, which can avoid challenges related to the dispersion of functional filler, presents a valuable but less-explored strategy. Herein, metallic copper-functionalized silica (Cu–SiO 2 ) aerogels were synthesized by co-condensing tetraethyl orthosilicate (TEOS) and 3-aminopropyltriethoxysilane (APTES) in the presence of copper acetate via an ambient pressure drying procedure followed by thermal reduction. The Cu 2+ was initially coordinated to the amino groups in APTES and in-situ anchored on the aerogel skeleton, which was then thermally reduced to metallic copper to fulfill the in-situ functionalization. Erythritol (ET) was then vacuum impregnated into the Cu–SiO 2 aerogels to obtain SSPCMs. The prepared SSPCMs exhibited a high ET loading of 86.9%, corresponding to a high latent heat of 307.5 J g −1 , and reduced supercooling. When the aerogel framework contained 3.46 wt% copper, the thermal conductivity of the SSPCM increased by 83.03% compared with that of pure ET. The SSPCM also showed a photothermal conversion efficiency of 71.82% due to the local surface plasmon resonance effect of metallic copper and the multidirectional light-scattering paths provided by the aerogel. In addition, the SSPCMs exhibited excellent thermal reliability over 100 melting/solidification cycles. Overall, this work presents a novel strategy for the preparation of functionalized silica-based composite aerogels and obtained a novel SSPCM for latent heat storage and solar thermal applications.
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产品关联
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2026
·Vol. 37
·期 6
·e70651
·
IF 3.8
Weijiang Huang,Jie Zhang,Ping Yang,Jinghan Hu,Chunyun Tu,Wentao He,Qin Tian,Kui Wang,Xiaolu Xu,Wei Yan
A novel P–N–Si coflame retardant comprising bio-based phytic acid/melamine–coated SiO 2 (PM@SiO 2 ) was designed. The effects of a combination of a 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-derived compound (PN-DOPO) with PM@SiO 2 on the flame retardancy and thermal decomposition of WPU were investigated. Compared with pure WPU, the WPU/PN-DOPO/PM@SiO 2 composites possessing different PM@SiO 2 addition amounts demonstrated enhanced flame retardancy. The addition of 5 wt% PM@SiO 2 and 9 wt% PN-DOPO increased the limiting oxygen index (LOI) of pure WPU from 19.0% to 29.4%, and the resulting material achieved a V-0 rating in the UL-94 test. Furthermore, the peak heat release rate (pHRR), total heat release (THR), and fire growth index of WPU/9%PN-DOPO/5%PM@SiO 2 considerably decreased by 36.1%, 29.1%, and 41.9%, respectively. The excellent flame retardancy is attributed to the ability of PM@SiO 2 to effectively repair defects in the char layer formed by the gas-phase PN-DOPO flame retardant via its silica-cross-linked network. Moreover, the initial thermal decomposition temperature of WPU/9%PN-DOPO/5%PM@SiO 2 increased from 229.6°C to 260.1°C. Moreover, the tensile strength and storage modulus were considerably enhanced. This study presents a new research paradigm for developing environmentally friendly flame-retardant WPUs based on green and synergistic multimechanistic strategies.
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高影响因子
危险品化学品经营许可证（带存储）