Materials Research Express
·
2018
·Vol. 5
·期 10
·105506
·
IF 1.151
Zhao Yangzhou,Yuan Weifeng,Zhao Chaoyang,Gu Bin,Hu Ning
In this work, a fabrication process was developed to incorporate nano-SiO2 particles into poly(vinylidene fluoride) to make piezoelectric films. Experimental tests show that the piezoelectricity of the nanocomposites can be improved if the weight fraction of the additive increases within a specific range. Optical microscope images indicate that the presence of SiO2 particles can reduce the average diameter of the spherulites and increase the amount of heterogeneous nucleation sites in the PVDF matrix. In the fabrication process, stretching is used to enhance the α-β-phase transformation and orient the dipoles of the β-phase. From the experiment in which the nanocomposite films were affixed onto a vibrating beam for electricity harvesting, it was found that the output voltages of the films are dependent on not only the amplitude but also the frequency of the beam's vibration. This finding may have great potential in the field of energy harvesting using flexible piezoelectric films.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2020
·
IF 4.217
Chunhong Qi,He Chen,Youyi Sun,Qiang Fu,Luyan shen,Xiaolin Li,Yaqing Liu
The superhydrophobic flower-like OTS-SiO 2 particles with tunable size were synthesized for application in anti-icing technology, in which the nanosilica fibers were grown on surface of SiO 2 sphere. Furthermore, the anti-icing process of flower-like OTS-SiO 2 particles was investigated by a high speed video and thermal infrared imaging equipment. It was found that the flower-like OTS-SiO 2 particles with a diameter of 300.0 nm showed best anti-icing ability, in which the frozen time of water droplets could be prolonged to 564.0 s at −25.0℃. The good anti-icing ability was attributed to micro-nano hierarchical structure and surface modification of flower-like OTS-SiO 2 particles. The work has an important guiding implication for the subsequent design and preparation of superhydrophobic particles for application in anti-icing technology.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Liping Rong,Xiaohui Fan,Gang Wang,Huanhuan Li,Dayong Zhang,Danni Luo,Sheng Li,Zhiguo Li
Improving the bond strength of wood emulsion adhesives is an ongoing challenge for the wood-processing industry. In this study, PVAc/PS core-shell emulsion particles are functionalized by forming coordination complexes between natural biomaterial tannic acid (TA) and Fe 3+ . The functionalized emulsion particles are assembled on the surface of the core template SiO 2 to form a “superstructure” through hydrogen bonding between the phenolic hydroxyl groups in the TA and the hydroxyl groups on the surface of SiO 2 , which can enhance the cohesive strength of the emulsion adhesive layer, thereby increasing the peel strength of wood adhesives. The results indicated that the functionalized emulsion particles were most effectively assembled on core template SiO 2 particles when the ratio of TA to Fe 3+ was 1:1 and the encapsulation rate of the assembled SiO 2 particles was 150 %. The glass transition temperatures (Tg1 and Tg2), storage modulus, tensile strength, and hardness of the assembled PVAc/PS emulsion film were measured by DSC, DMA, tensile testing machine, and durometer. These properties increased by 11.6 %, 5.3 %, 14.9 %, 127.6 %, and 46.3 %, respectively, compared to those of the PVAc/PS emulsion film. Further, the shear strength of the assembled PVAc/PS emulsion for bonding wood blocks and the peel strength for bonding thin veneers increased by 33.8 and 35.7 %, respectively, compared to those of the PVAc/PS emulsion. This study confirmed that using a modular assembly to improve PVAc/PS emulsion bonding properties can help formulate high-performance waterborne emulsion adhesives with promising applications in the field of thin-wood veneer bonding. This strategy provides an effective method to design and build environmentally friendly, low-cost, and high-performance water-based emulsion adhesives.
研究领域:
材料科学
·
林业工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER SCIENCE SERIES B
·
2024
·
IF 1
Yawen Guo,Zhao Lielun,Kang Tiantai,Jiang Yan,Zhang Haobin,Zhang Hongwen
Abstract In this paper, TiO 2 particles submicron were prepared by sol-gel method and modified with 3-aminopropyl triethoxysilane (KH550) after coating SiO 2 on its surface. Subsequently, combined with the breath figure method (BF), slippery liquid-infused porous surfaces (SLIPS) of polyimide composites were prepared by a two-step method using TiO 2 /SiO 2 particles, amino terminated polysiloxanes (APT-PDMS), 2,2'-bis[4-(4-aminophenoxyphenyl)]propane (BAPP) and 1,2,4,5-cyclohexanetetracarboxylic dianhydride (HPMDA) as the raw materials. The compositions and properties of the composites were characterized by infrared spectroscopy, nuclear magnetic resonance and thermal weight loss, respectively. The apparent morphology of the porous membrane was observed by scanning electron microscopy, and the hydrophobic properties of the porous membrane were investigated before and after the infilling of the silicone oil by contact angle tester. The results show that the hydrophobicity of the porous substrate prepared when the content of TiO 2 /SiO 2 particles is 15% and the concentration of composite material is 20 mg/mL is the best, and the sliding angle of the oil-filled SLIPS is 2° at the minimum. The SLIPS owns good stability, self-cleaning, and anti-freezing properties and so on.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Xinyu Zhao,Furui He,Gaobo Yu,Yuhong Feng,Jiacheng Li
The separation of crude oil from oily water and collection of the emulsion constituents has attracted significant attention. We demonstrate that the relationships between inherent dynamic factors and the performance of a Pickering emulsion stabilized by SiO 2 particles with adsorbed hydrophobically modified sodium alginate derivatives (HMSA), a natural pH-sensitive polysaccharide , can be clarified via a multi-scale methodology. Functionalization of the silica surface with HMSA controls particle dispersibility, as verified by turbidity and stability analyses, the zeta potential , and transmission electron microscopy measurements. The interaction mechanism between HMSA and SiO 2 nanoparticles was elucidated by both experimental adsorption measurements and computer simulations, which showed qualitative consistency. The aggregation/disaggregation of HMSA/SiO 2 particles achieved by tuning the pH of the solution facilitated reversible dispersibility/collectability behavior. Overall, a high-viscosity Pickering emulsion system based on particle-particle and droplet-droplet interactions, which can be filtered for the recovery of spilled crude oil, was demonstrated.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Ying Zhang,Hongsheng Lu,Baogang Wang,Na Wang,Dongfang Liu
A novel stimulus-responsive non-Pickering emulsion stabilized by nano-SiO2 particles was prepared in our recent study. 4-formylbenzoic acid and hexylamine through a dynamic covalent bond form a surface-active substance, which was confirmed by Fourier transform infrared (FTIR) and 1H NMR. Through optimization experiments, it was proved that a stable emulsion can be formed by low surfactant concentration (below cmc) and low nano-SiO2 particle concentration (0.5 wt %). In this emulsion, nano-SiO2 particles are not located at the interface of oil–water but dispersed in the continuous phase of the emulsion, which is different from the Pickering emulsion. The negatively charged nano-SiO2 particles and anionic surfactants repel each other, thereby synergistically stabilizing the emulsion so that the concentrations of surfactants and nanoparticles required to stabilize the emulsion are reduced. In addition, the system can also control the formation and fracture of dynamic covalent bonds by changing pH, thereby controlling the stability and demulsification of the emulsion. At the same time, this non-Pickering emulsion could be used as a microreactor for chemical synthesis and still had a high yield after three cycles. This study provides a new application direction for this environmentally friendly emulsion.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2014
·Vol. 15
·期 10
·2118-2123
·
IF 1.113
Zhuang Guangqing,Zhang Yun,Jia Yanrong,Qi Dongming,Fan Qinguo,Shao Jianzhong
The monodispersed SiO 2 particles with perfect sphericity and desired particle sizes were synthesized by an improved Stöber method. The particle sizes and size distribution of colloidal silica could be regulated by adjusting reaction temperature, reaction time, and the concentrations of NH 4 OH, H 2 O and TEOS. Dynamic light scattering particle size analysis and SEM analysis confirmed a narrowly distributed particle size and good sphericity of the synthesized SiO 2 nanoparticles. The structural colors of silica/polyethyleneimine (SiO 2 /PEI) thin film fabricated on polyester fabrics were governed by SiO 2 particle size, assembly cycles and viewing angles, and the origin mechanism of the structural colors was based on the thin film interference theory. The resultant polyester fabrics showed vivid structural colors changing with the change in viewing angles, displaying a biomimetic variable coloration effect on textiles.
研究领域:
材料科学
·
纺织工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2022
·Vol. 43
·期 8
·5087-5094
·
IF 3.531
Hongbo Hou,Zejun Pu,Xu Wang,Rongli Zhu,Xianyong Li,Jiachun Zhong
In this study, WPU@SiO 2 nanoparticles were obtained by grafting waterborne polyurethane (WPU) on the surface of silicon dioxide (SiO 2 ). Then, WPU@SiO 2 nanoparticles were introduced into the matrix of polybutylene succinate (PBS) to prepare a series of PBS/WPU@SiO 2 composites. The dispersibility and interfacial compatibility of filler and matrix can be improved obviously by grafting a layer of WPU onto the surface of SiO 2 nanoparticles. The FTIR and TGA results showed that WPU was successfully grafted onto the surface of SiO 2 . According to polarizing microscope images, it is clear that the size of the pure PBS crystals is much larger than that of the PBS/WPU@SiO 2 , and a large number of crystals are evenly distributed in the PBS/WPU@SiO 2 composite. In addition, DSC and TGA results indicated that PBS/WPU@SiO 2 composite films show excellent thermal properties. Meanwhile, the initial thermal decomposition temperature of PBS/WPU@SiO 2 composite films is about 366–374°C. For the 10 wt% WPU@SiO 2 reinforced PBS-based composite films, the tensile strength reached the ultimate value (38.49 MPa), which is 32.04% higher than that of pure PBS. Based on its excellent mechanical and thermal properties, the PBS/WPU@SiO 2 composites have a broad application prospect in the field of biodegradable materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
FIRE TECHNOLOGY
·
2024
·
IF 2.3
Zhang Jiaqing,Shang Fengju,Liu Xin,Li Kaiyuan,Yang Yunpeng,Zou Yanyan
Nano SiO 2 particles (NPs) combined with organosilane surfactants present a promising avenue for the development of stable fluorine-free firefighting foams. In this study, hydrophilic nano SiO 2 particles, non-ionic organosilane surfactant (SiCare2238), and amphoteric hydrocarbon surfactant (LAMC) were prepared as a mixed dispersion to investigate the interactions between nano particles and surfactants, foaming ability, and foam stability of the mixed dispersion. Results indicated that the surface activity, electrical conductivity, and foaming ability of the mixed dispersion decreased with increasing NPs concentration. The impact of NPs on foam stability depended on the filling and blocking mechanisms within the platform boundary of the formed liquid film. At NPs concentrations below 1.5%, strong electrostatic interactions among surfactant molecules resulted in the adsorption of surfactant molecules on the nano particle surface, preventing the formation of a network structure at the platform boundary, thereby reducing foam stability. At NPs concentrations above 1.5%, a significant number of NPs formed a network structure, filling and blocking the platform boundary, leading to delayed foam drainage, coarsening, and enhanced foam stability. This study provides theoretical guidance for the application of nano particles in fluorine-free.
研究领域:
材料科学
·
化学工程
·
消防技术
✓ 已验证
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2018
·
IF 3.239
Xue Liu,Zengyao Wang,Chengji Zhao,Wenhuan Bu,Hui Na
A series of fluorinated dental resin composites were prepared with two kinds of SiO 2 particles. Bis-GMA (bisphenol A-glycerolate dimethacrylate)/4-TF-PQEA (fluorinated acrylate monomer)/TEGDMA (triethylene glycol dimethacrylate) (40/30/30, wt/wt/wt) was introduced as resin matrix . SiO 2 nanopartices (30 nm) and SiO 2 microparticles (0.3 µm) were silanized with 3-methacryloxypropyl trimethoxysilane (γ-MPS) and used as fillers. After mixing the resin matrix with 0%, 10%, 20%, 30% SiO 2 nanopartices and 0%, 10%, 20%, 30%, 40%, 50% SiO 2 microparticles, respectively, the fluorinated resin composites were obtained. Properties including double bond conversion (DC), polymerization shrinkage (PS), water sorption (W p ), water solubility (W y ), mechanical properties and cytotoxicity were investigated in comparison with those of neat resin system. The results showed that, filler particles could improve the overall performance of resin composites, particularly in improving mechanical properties and reducing PS of composites along with the addition of filler loading. Compared to resin composites containing SiO 2 microparticles, SiO 2 nanoparticles resin composites had higher DC, higher mechanical properties, lower PS and lower W p under the same filler content . Especially, 50% SiO 2 microparticles reinforced resins exhibited the best flexural strength (104.04 ± 7.40 MPa), flexural modulus (5.62 ± 0.16 GPa), vickers microhardness (37.34 ± 1.13 HV), compressive strength (301.54 ± 5.66 MPa) and the lowest polymerization (3.42 ± 0.22%).
研究领域:
材料科学
·
牙科材料
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）