Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2014
·
IF 0.74
Guolun Xiahou,Weiqu Liu,Zhenlong Yan,Kui Su,Honglei Wang
Long side chain polyurethane oligomers were synthesized from tolylene diisocyanate (TDI), polyether triol (N330) and monohydroxy terminated polydimethylsiloxane (M-PDMS, ), and the structures were characterized by FT-IR spectrum. Subsequently, they were mixed with polyurethane oligomers synthesized from TDI and polyether triol (N220) to obtain M-PDMS graft modified polyurethanes (M-PDMS-PUs). Dihydroxy terminated polydimethylsiloxane modified polyurethanes (D-PDMS-PUs) were also prepared for the study in contrasts with M-PDMS-PUs. The influence of concentration and length of PDMS on the surface, thermal and mechanical properties was investigated by contact angle measurement, thermo-gravimetric analysis (TGA), different scanning calorimeter (DSC) and mechanical testing. Water contact angles showed the M-PDMS-PUs had higher contact angles than that of D-PDMS-PUs. Added with low amount of PDMS (2.6 wt%), the water contact angle of M-PDMS-PU was 95.5°C while that of D-PDMS-PU was 88.0o. TGA data showed that M-PDMS-PU (Tmax = 368.0°C) had better thermal stability than that of D-PDMS-PU (Tmax = 362.2°C) at low PDMS concentration (2.6 wt%). DSC data revealed that the incorporation of PDMS into PU resulted in a decrease in Tg values and the Tg values of D-PDMS-PUs decreased more drastically than those of M-PDMS-PUs. Mechanical testing indicated that the tensile strength, elongation at break and Shore A hardness of the PDMS modified polyurethanes decreased with the increase of the PDMS content. The morphologies of the fracture surfaces of the copolymers showed that microphase separation between PU and PDMS was formed in both types of PDMS modified polyurethanes and the size of the polysilicone phase became larger with increasing the PDMS content.
研究领域:
高分子化学
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材料科学
·
表面科学
·
热分析
·
力学性能测试
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 123
·101982-101988
·
IF 3.84
Chang Liu,Bing Yan
Heterostructured chemosensors have excellent chemical stability, low contamination and excellent recyclability, and are regarded as a promising new generation of sensors with critical properties related to their sensing sensitivity and selectivity. Our preparation strategy for a heterostructured sensor is to construct it using a luminescent lanthanide complex and metal organic framework (MOF). A heterogeneous sensor is systematically produced using EuTTA and ZIF-8 to cover silica, and thin particles are obtained with small size and uniform morphology. Then, the particles were used as a highly selective and sensitive sensor to detect Cu2+ in aqueous solution. Eventually, we find that the well-structured silica@EuTTA@ZIF-8 microspheres have a good fluorescence stability, low detection limit and broad linear range in aqueous environments. These excellent properties make it a potential chemosensor for sensing of Cu2+ in environmental or biological solution systems.
研究领域:
分析化学
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环境监测
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生物传感
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材料科学
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无机化学
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纳米技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·Vol. 46
·期 4
·4720-4729
·
IF 3.45
Guojiao Ding,Rujie He,Keqiang Zhang,Min Xia,Chengwei Feng,Daining Fang
Stereolithography based additive manufacturing provides an effective method to fabricate complex-shaped SiC ceramic components. The dispersion and stability of the ceramic slurry are very important for stereolithography. In this study, the dispersion and stability of SiC ceramic slurries were investigated systematically. The effects of resin monomers , dispersants , particle size, solid loading and ball milling time on the dispersion, rheological behavior and stability of SiC ceramic slurries were studied in detail. Finally, an optimal SiC ceramic slurry for stereolithography based additive manufacturing was obtained, and complex-shaped SiC ceramic architectures were fabricated.
研究领域:
材料科学
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先进制造
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陶瓷工程
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高分子材料
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复合材料
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DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 5
·1165-1175
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IF 2.5
Liu Shuling,Zhang Wei,An Yiming,Li Ying,Wang Jie,Wang Chao
The Si-based flexible electrodes attracted increasing research interests owing to the growing demand for high-performance flexible energy storage devices. Herein, a facile and smart self-assembly strategy is adopted to address huge volume expansion and particle aggregation issues of Si-based anodes, and a high-performance freestanding film anode (NC@Si/CNTs/N-rGO) is synthesized. The 3D-crosslinked porous graphene-CNTs networks offer abundant electric conductive pathways, high active sites, large internal space to accommodate the expansion of Si NPs, and facilitate Li + diffusion and insertion/extraction kinetics. The synergistic effect between the well-dispersed Si/NC nanoparticles and 3D porous networks significantly enhances electrochemical performance of Si NPs. The as-prepared NC@Si/CNTs/N-rGO electrode exhibits a high reversible specific capacity of 1089 mAh·g −1 at a charge–discharge current density of 1 A·g −1 after 500 cycles. Even at 2 A·g −1 , the electrode still exhibits an excellent reversible specific capacity of 606 mAh·g −1 after 300 cycles. These indicate that the NC@Si/CNTs/N-rGO is a promising candidate for high-performance flexible anode material in lithium-ion batteries.
研究领域:
材料科学
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电化学
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纳米科技
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能源存储
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先进电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Mengyi Wang,Li Yin,Mingqi Li,Shaohua Luo,Chao Wang
To develop low-cost, high-capacity and long-life anode materials for lithium-ion batteries, glucose-C and F-doped C coated SiO composites with adjustable pore structure (p-SiO@gl-C@F-doped C) are synthesized by facile and scalable methods. The combination of the heterogeneous dual-carbon shells and porous structure significantly promotes the reaction kinetics of the electrode, effectively suppresses and buffers the volume expansion of SiO, and largely enhances the stability of solid electrolyte interface of the electrode. In a half cell, the optimized p-SiO@gl-C@F-doped C (7:3) composite shows a stable discharge capacity of 785 mAh g −1 at a current density of 200 mA g −1 . The discharge capacity is maintained at 772 mAh g −1 after 200 cycles. At a current density of 400 mA g −1 , the electrode shows a discharge capacity of 633 mAh g −1 after 500 cycles, with a capacity degradation of ∼0.0096% per cycle from the 2nd cycle to the 500th cycle. The full cell which is composed of the commercial LiFePO 4 as a cathode and the optimized composite as an anode, exhibits high capacity and good cycling stability.
研究领域:
材料科学
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电化学
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能源存储
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纳米复合材料
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电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2014
·Vol. 26
·期 2
·884-890
·
IF 1.966
Li Rui,Wang Yan-ze,Mao Zhi-yong,Wang Da-Jian
A remote phosphor coating by using Sr 3 (Al,Si)(O, F) 5 :Ce 3+ (SASF:Ce 3+ ) on glass substrate was prepared by a simple and convenient screen printing method. The crystalline phase and the distribution of SASF:Ce 3+ crystals in coating were investigated by XRD and SEM, respectively. The scattering light and absorption light properties of remote phosphor coating with different thicknesses were discussed through Lambert–Beer’s law. The relationship between luminous efficiency and absorption coefficient was demonstrated. White light emitting diode prototype fabricated with blue chip and the prepared patterned SASF:Ce 3+ remote phosphor in this work showed excellent performances, opening a cost-effective process to generate planar white light.
研究领域:
材料科学
·
光学工程
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发光材料
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固态照明
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功能涂层
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 31
·15016-15023
·
IF 3.925
Yayue He,Youjia Zhang,Zhenxi Li,Peng-Fei Cao,Huabin Yang,Shilun Gao
As a promising anode material for next-generation high-energy density lithium-ion batteries (LIBs), one of the main technical issues for silicon (Si) electrodes is the low initial Coulombic efficiency (ICE). By a pre-lithiation process, preparation of lithium–silicon (Li–Si) alloy electrodes can efficiently improve the ICE, thus leading to excellent electrochemical performance. Herein, with solid wastes as precursors, we report a cost-efficient approach for the fabrication of Li3.25Si anode materials via simple magnesiothermic reduction and then mechanical alloy reaction methods, combining the advantages of low-cost and high ICE. The prepared Li3.25Si@acetylene black (Li3.25Si@A) electrode exhibits excellent electrochemical performance with a high reversible capacity of 1138.9 mA h g−1 over 90 cycles at a current density of 100 mA g−1 and its ICE is as high as 107.7%, which is superior to that of the commercial Li3.25Si@A electrode. With a simple and low-cost manufacturing process and high ICE, the fabrication process will be definitely meaningful in achieving low-cost and high-capacity anode materials with a prolonged cycle life.
研究领域:
材料科学
·
电化学
·
能源存储
·
可持续材料
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 21
·
IF 1.64
Yang Meng,Junfeng Chu,Chaohao Liu,Zheng Wei,Liqun Zhang
A series of poly(methylvinylsiloxane) elastomer (VMQ) composites with improved oil resistance were prepared by introducing uniform polar polymer phases into VMQ matrix through the in situ reaction of reactive polar monomers—hydroxyethyl methacrylate (HEMA) and hydroxypropyl methacrylate (HPMA)—during peroxide curing. Differential scanning calorimetry and Fourier transform infrared measurements demonstrated that HEMA and HPMA had high reactivity and most of the monomers participated in the in situ reaction during peroxide curing. Transmission electron microscopic images showed that the uniform nanophases with the diameters in the range of 20–50 nm formed in the VMQ vulcanizates. The generated nanophases could interact with silica to form a strong filler network in the VMQ matrix, resulting in a significant increase of the modulus at low elongation of the VMQ vulcanizates. With increasing the content of polar monomers, the tensile strength decreased slightly, the elongation at break, the hardness and the 100% modulus increased, but the 300% modulus decreased significantly due to the decrease of the crosslink density. The incorporation of HEMA or HPMA into VMQ matrix could significantly improve the oil resistance of polysiloxane elastomer, and the oil resistance of the composites containing HEMA was a little better than that of the composites containing HPMA. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40983.
研究领域:
高分子科学
·
材料科学
·
复合材料
·
弹性体
·
功能高分子
·
纳米材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 39
·20208-20215
·
IF 3.708
Lei Sun,Xinge Zhang,Jinxia An,Cui Su,Qianqain Guo,Chaoxing Li
Currently, the major challenge for cancer treatment is to develop simple and smart nanocarriers that can efficiently retain the encapsulated drug during blood circulation, recognize tumor cells and quickly release the drug under stimulation. In this paper, such a pH-sensitive core–shell composite nanoparticles is prepared based on a 3-aminophenylboronic acid modified mesoporous silica nanoparticles (MSN–APBA) core coated with a lactobionic acid grafted chitosan (CS–LA) shell via boronate ester bonds. The MSN core increases drug loading capacity and stability, and lactobionic acid offers abundant diols which can form pH sensitive boronate ester bonds with APBA on MSN. Meanwhile, the lactobionic acid-conjugated shell could also efficiently target the asialoglycoprotein receptor over expressing hepatoma cells. The successful synthesis of CS–LA and MSN–APBA is confirmed by the results of TGA, TEM, DLS, FT-IR, 1H-NMR and N2 adsorption–desorption. Doxorubicin hydrochloride (DOX) is applied as a model drug and the behaviors of drug loading/release are investigated. The drug loading behavior is pH-dependent, and its drug encapsulation efficiency is near 80% and loading capacity is 13.05%. The results of cumulative in vitro release indicate that at neutral pH, the pores of the MSN are effectively capped with a polymer shell and the drug release is strongly inhibited, almost zero release. While at acidic pH, the hydrolysis of the boroester bond takes place and thus results in a rapid release of the entrapped drug. The cytotoxicity assay indicates high cell biocompatibility of this material and it is suitable as a drug carrier. When loaded with DOX, it presents distinctly cytotoxic behavior to HepG2 cells, due to the sustained release of drug. These results imply that the core–shell nanoparticles are promising platforms to construct simple and effective pH-responsive controlled drug delivery systems for cancer therapy.
研究领域:
肿瘤学
·
药剂学
·
纳米医学
·
生物材料
·
分子药理学
·
靶向治疗
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Yuxiao Li,Meishan Zhang,Xueyan Wang,Zhun Li,Lianhua Zhao
Sulfonated poly (ether ether ketone) (SPEEK, SP) with tetraethoxysilane (TEOS) and diethylethylammonium trifluoromethanesulfonate ([dema] [OTf]) were used to make SP/SiOx/OTf inorganic–organic composite membranes by the sol–gel method. The composite membranes were studied with respect to their structural, thermal, ionic liquid leeching (ILs), mechanical, and proton conduction properties. Fourier transform infrared spectroscopy (FT-IR) results showed that there exist intermolecular forces between the sulfonic groups, silica, and ILs in the composite membrane. Thermogravimetric (TG) results showed that the thermal stability of the SP/SiOx/OTf composite membrane is better than that of the pristine SPEEK membrane. IL leaching studies showed that the sulfonic group could help to reduce the loss of ILs. The introduction of silica in the SP/SiOx/OTf composite membrane could further reduce the loss of ILs, and also reduce the swelling degree of the composite membrane. Dynamic mechanical analysis (DMA) data showed that the introduction of silica can increase the flexibility of membranes, and improve the mechanical properties. A proton conductivity of 2.003 × 10 −2 S/cm was obtained for a 50 wt% [dema][OTf] doped SP-66/SiOx/OTF-50 composite membranes at 220 °C under anhydrous conditions.
研究领域:
材料科学
·
高分子化学
·
能源材料
·
电化学
·
膜科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 12
·12813-12819
·
IF 1.798
Li Jun,Wang Yao,Huang Zongyu,Huang Kai,Qi Xiang,Zhong Jianxin
We demonstrated that titanium dioxide (TiO 2 ) significantly enhances the reversible capacity of silicon nanoparticles (SiNPs) used as the anode material for lithium ion batteries. The novel silicon and titanium dioxide core–shell nanoparticles (Si/TiO 2 ) was prepared via a facile sol–gel method with the following heat-treatment process. The as-prepared materials were confirmed by X-ray diffraction, Raman spectra and transmission electron microscope. As an anode material for battery, the electrode was investigated by a series of electrochemical measurements. The as-prepared Si/TiO 2 electrode exhibits superior electrochemical performance in comparison with pure SiNPs, which realizes an initial capacity as high as 2636.9 mAh/g and still retains 1010.7 mAh/g even after 100 cycles of charging and discharging. The excellent cycle stability and capacity retention of the as-prepared electrode would be attributed to the existence of TiO 2 layers to accommodate the large volume changes of silicon and enhancement ability to minimizes loss of pulverization during the lithium insertion/desertion cycles. Therefore, the as-prepared Si/TiO 2 is believed to be an potential anode material for lithium-ion battery applications.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2016
·Vol. 26
·期 37
·6797-6806
·
IF 11.382
Yue Ma,Reza Younesi,Ruijun Pan,Chenjuan Liu,Jiefang Zhu,Bingqing Wei,Kristina Edström
Pulverization of electrode materials and loss of electrical contact have been identified as the major causes for the performance deterioration of alloy anodes in Li-ion batteries. This study presents the hierarchical arrangement of spatially confining silicon nanoparticles (Si NPs) within graphene foam (GF) for alleviating these issues. Through a freeze-drying method, the highly oriented GF monolith is engineered to fully encapsulate the Si NPs, serving not only as a robust framework with the well-accessible thoroughfares for electrolyte percolation but also a physical blocking layer to restrain Si from direct exposure to the electrolyte. In return, the pillar effect of Si NPs prevents the graphene sheets from restacking while preserving the highly efficient electron/Li + transport channels. When evaluated as a binder-free anode, impressive cycle performance is realized in both half-cell and full-cell configurations. Operando X-ray diffraction and in-house X-ray photoelectron spectroscopy confirm the pivotal protection of GF to sheathe the most volume-expanded lithiated phase (Li 15 Si 4 ) at room temperature. Furthermore, a free-standing composite film is developed through readjusting the pore size in GF/Si monolith and directly integrated with nanocellulose membrane (NCM) separator. Because of the good electrical conductivity and structural integrity of the GF monolith as well as the flexibility of the NCM separator, the as-developed GF/Si-NCM electrode showcases the potential use in the flexible electronic devices.
研究领域:
材料科学
·
电化学
·
纳米能源材料
·
储能技术
·
先进电池
·
柔性电子器件
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）