MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Yanqiu Zhang,Sai Xu,Xiangping Li,Jinsu Zhang,Jiashi Sun,Haiping Xia,Ruinian Hua,Baojiu Chen
Novel nanoplatform with excellent photothermal conversion and temperature feedback are preferable in clinical photothermal therapy (PTT). In this work, a hybrid of NaYF 4 :Er 3+ ,Yb 3+ @NaYF 4 upconversion nanoparticles (UCNPs) conjugated with gold nanorods (GNRs) was fabricated in order to achieve effective photothermal conversion and excellent temperature detection. In this nanoplatform, the GNRs as photo-activated nano-heaters could effectively convert the 808 nm photoenergy into heat, meanwhile UCNPs as 980 nm triggered temperature probe could read the temperature in an exact microdomain where the nanocomposite was located at. The effects of excitation source, GNRs concentration and power density on photothermal conversion were investigated. In addition, the difference between eigen temperature of nanoparticles and solution temperature, and the potential for temperature feedback were analyzed under double lasers excitation. Moreover, the photothermal conversion efficiency was experimentally confirmed from thermodynamic analysis. It was found that the nanocomposite can be an excellent nanoplatform for potential application in advanced PTT.
研究领域:
生物医学工程
·
纳米医学
·
肿瘤治疗
·
光热疗法
·
分子影像
·
热疗监测
·
转化医学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·Vol. 9
·期 4
·105292
·
IF 5.909
Jie Zhou,Wenyi Cai,Jing Ding,Hui Wan,Guofeng Guan
The appropriate construct of Z-scheme heterostructure composite with high photocatalytic activity has created new opportunities for environmental protection. Herein, graphitic carbon nitride quantum dots/tungsten trioxide (CNQDs/WO 3 ) was firstly fabricated using CNQDs decorated onto the surface of WO 3 nanorod grown along the [110] orientation in hydrothermal environment to construct a Z-scheme heterostructure composite. By various characterization methods, the crystal structure, micro morphology, atomic valence state and surface functional groups of the catalyst were systematically revealed. The results indicated that Z-scheme heterojunctions between CNQDs and WO 3 were successfully constructed. Compared with pure WO 3 , CNQDs/WO 3 exhibited prominent photoreduction performance under visible light irradiation. The optimal 5% CNQDs/WO 3 could reduce almost 100% Cr (VI) under acidic condition with the best photocatalytic activity within 90 min. More than this, 5% CNQDs/WO 3 also displayed excellent stability and recyclability even after five cycles of photoreduction experiments. Based on the free radical quenching experiments, the possible photoreduction reaction mechanism had been proposed in detail. The Z-scheme heterostructure provided the possibility of the generation, rapidly transfer and efficient separation of photogenerated electrons, which were major active species in the Cr (VI) photoreduction process.
研究领域:
环境催化
·
材料化学
·
纳米科技
·
光催化
·
环境污染治理
·
半导体异质结
✓ 已验证
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 43
·2004614
·
IF 11.459
Xian Wang,Anrui Dong,Ziyi Zhu,Lulu Chai,Junyang Ding,Li Zhong,Ting-Ting Li,Yue Hu,Jinjie Qian,Shaoming Huang
In the preparation of nanomaterials, the kinetics and thermodynamics in the reaction can significantly affect the structures and phases of nanocrystals. Therefore, people are keen to adopt various synthetic strategies to accurately assemble the target nanocrystals, and reveal the underlying mechanism of the formation of specific structures. In this work, the total reaction time is adjusted to let the prepared MnCo Prussian blue analogous (MnCoPBA) crystals show four evolving morphological changes at different stages with the assistance of sodium dodecyl sulfate. Furthermore, it is clearly observed that the epitaxial growth along the (100) plane on the shell of MnCoPBA nanocrystals is favored, and the thermodynamics and kinetics in the morphology change process are analyzed in detail. Through the simple pyrolysis, MnCoPBA crystals can be successfully converted into the corresponding carbon composites, of which Mn 2 Co 2 C nanoparticles are evenly distributed in highly graphitized carbon matrix. Among them, PBA-III-700 performs good oxygen reduction reaction performance in alkaline solution with the half-wave potential of 0.801 V and diffusion-limited current density of 5.36 mA cm −2 , and its zinc-air battery exhibits the peak power density of 103.4 mW cm −2 competitive with commercial Pt/C.
研究领域:
材料化学
·
纳米科学与技术
·
电化学
·
能源材料
·
无机功能材料
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 26
·期 8
·953-959
·
IF 1.757
Shuting Wang,Lan Cen,Qihao Wu
Maleated glycidyl 3-pentadecenyl phenyl ether with styrene (MGS) was synthesized from glycidyl 3-pentadecenyl phenyl ether (GPPE), maleic anhydride (MAH) and styrene (St) in the presence of AIBN initiator at 80°C, and then the resultant MGS was applied as a compatibilizer to prepare SBR/silica composites. Meanwhile, the commercial compatibilizer bis-(triethoxysilylpropyl) tetrasulfide (named Si69) added into composite was also prepared for comparison purpose. The synthetic MGS structure was characterized by GPC and FTIR, and SBR/silica compounds with different compatibilizer were analyzed using RPA, DMA and so on. The results showed that M̄n and M̄w of MGS were 19,538 g/mol and 23,790 g/mol, respectively. The curing time of compounds with MGS increased, whereas the maximum and minimum torques decreased. The addition of MGS decreased Payne effect of SBR/silica compounds, which implied an improvement of silica dispersion in the compounds. Bound rubber content of compound with MGS was about 1.7 times higher than the absence and 1.5 times higher than that with Si69. The tensile strength of the composites was improved by increasing compatibilizer loading, and the optimum value was observed at 6 phr of MGS. Meanwhile the use of MGS can improve the anti-aging property of composite. According to DMA, the tanδ value at 0°C of composite with MGS was higher than composite without compatibilizer suggesting that MGS can improve the wet skid resistance of composite. The SEM analysis revealed that introduction of MGS enhanced the compatibility between SBR and silica. Copyright © 2015 John Wiley & Sons, Ltd.
研究领域:
高分子化学
·
橡胶复合材料
·
材料界面科学
·
功能高分子
·
聚合物改性
✓ 已验证
DOI
高影响因子
POLYMER TESTING
·
2020
·
IF 3.275
Rui Wang,Congzhen Xie,Bin Gou,Huasong Xu,Shoukang Luo,Jiangang Zhou,Leilei Zeng
Dielectric polymers with high thermal conductivity are very promising in the fields of aerospace and electronic device packaging. However, composites with excellent dielectric properties usually have low thermal conductivity. It is usually to fill the polymer with thermal conductivity particles to improve the thermal conductivity, but the high content of filler often reduces the mechanical properties of the polymer. In this paper, the traditional insulating polymer epoxy resin was used as the matrix, by covering the surface of silicon carbide with graphene to form a core-shell structure and co-filled with nano diamonds to achieve the preparation of high-performance epoxy resin at low content. The results showed that at the filling content of 30 wt%, the thermal conductivity of epoxy nanocomposites showed a dramatic thermal conductivity enhancement of 1263%, the energy storage modulus increased by 1.1 GPa, and the dielectric loss remained unchanged at 50 Hz. The advantages of the composite are the structural design and surface modification of the filler, which not only take advantage of its inherent advantages, but also improve the interface area with the epoxy matrix. The composite materials with excellent properties are expected to provide theoretical guidance for the application of high thermal conductivity dielectric materials.
研究领域:
材料科学
·
高分子化学
·
复合材料工程
·
电子封装材料
·
介电材料
·
热管理材料
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Keng Xuan,Juan Wang,Zhiheng Gong,Xuegang Wang,Jun Li,Yadan Guo,Zhanxue Sun
In this work, nanoscale hydroxyapatite (HAP)-modified ZIF-67 composite, HAP/ZIF-67, with abundant functional groups for uranium(VI) binding was synthesized via a facile ultrasound-assisted synthesis method. The prepared HAP/ZIF-67 was characterized by XRD , SEM, TEM , BET, FT-IR and XPS techniques, and was applied to eliminate uranium(VI) from aqueous solutions under various conditions, i.e., pH, coexisting ions, temperature and contact time. The results indicate that the abundant Co-OH, -C N- and -NH- binding groups originating from the ZIF-67 and the Ca-OH and PO 4 3- derived from loaded nanoscale HAP synergistically endowed HAP/ZIF-67 with the excellent U(VI) adsorption capacity of 453.1 mg/g, which is 2.55 and 1.78 times that of pristine HAP and ZIF-67. HAP/ZIF-67 showed high adsorption selectivity toward U(VI), and the U(VI) elimination efficiency for real wastewater by HAP/ZIF-67 reached 97.29%. The adsorption kinetics and isotherms were well simulated by the pseudo-second-order model and Langmuir isotherm model, respectively, suggesting that U(VI) adsorption was an endothermic monolayer chemisorption process. The adsorption mechanism of U (VI) by HAP/ZIF-67 was dominated by surface complexation process. This work is expected to provide an effective strategy for developing HAP-modified MOFs absorbent to be used for the highly efficient elimination of radionuclides from wastewater.
研究领域:
环境科学
·
材料科学
·
核化学
·
水污染控制
·
吸附技术
·
功能材料
·
放射性核素去除
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Ziqiang Tong,Xiufeng Liu,Baoquan Zhang
A series of sphere-like polyelectrolyte complexes (PECs) and their homogeneous polyelectrolyte complex membranes (HPECMs) were synthesized by using sodium carboxymethyl cellulose (CMCNa) and poly(diallyldimethylammonium chloride) (PDDA). Different compositions or ionic complexation degrees (ICD) of PECs could be characterized by FT-IR spectra. The circular dichroism spectrum (CD) and field emission scanning electron microscopy (FESEM) were employed to examine the conformation and morphology of PECs, respectively. Zeta (ζ) potential was utilized to investigate the charge density of PEC particles while the surface hydrophilicity of HPECMs was studied by using contact angle (CA) meter. When subjected to ethanol dehydration, HPECMs revealed a satisfactory pervaporation performance and desired anti-trade-off phenomenon. For HPECM 0.31 and HPECM 0.57, the permeation fluxes were 2.25 kg m −2 h −1 and 2.93 kg m −2 h −1 , and the water content in permeate reached up to 99.35 wt% and 99.38 wt%, with respect to 10 wt% water in feed under 70 °C. All the results indicated that small-sized and sphere-like PECs were truly in favor of enhancing the pervaporation performance in ethanol dehydration.
研究领域:
高分子科学
·
膜分离技术
·
化学工程
·
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Wan Su,Yufeng Zhang,Wenjuan Zhang,Shuting Xie,Xiaobo Sun,Jianqiang Meng
In this study, a nanofiltration (NF) polyamide hollow fiber thin film composite membrane with a low rejection and a high flux was prepared in consideration of the “trade-off” relation between salt rejection and permeate flux of the membrane. The membrane was able to retain the beneficial minerals in tap water while keeping the body healthy. The membrane prepared had a thinner active skin layer (<100 nm) than those of commercial membranes. A permeability of 30.07 L/m 2 /h and a rejection rate of 79.68% for 1,000 mg/L MgSO 4 at 0.2 MPa were obtained. In addiiton, Fe 3+ , Cu 2+ , and Pb 2+ were used to evaluate the heavy metal removal performance of the NF membrane. It was found that as the concentration of heavy metal ions increased to three times of the Standards for Drinking Water Quality (SDWQ) (GB5749-2006), and the rejections to all heavy metal ions were more than 76%. In addition, the NF membrane had a good long-term rejection stability for the heavy metal ions over a 12-month dynamic filtration experiment. The results showed that the newly prepared NF membrane has a good application prospect for domestic water purification.
研究领域:
环境科学
·
材料科学
·
膜技术
·
水处理
·
纳米技术
·
化学工程
·
公共卫生工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·Vol. 44
·期 12
·6148-6159
·
IF 4.084
Xiaoyu Zhang,Shiyuan Yu,Qian Zhu,Lianhua Zhao
The novel SP/IL/AMS composite membrane doped with amino-functionalized mesoporous silica (AMS) was successfully prepared. Sulfonated poly ether ether ketone (SPEEK, SP) was used as the polymer matrix and the ionic liquid (IL) was N -ethylimidazolium trifluoromethanesulfonate (EIm[Tfo]). Its properties were compared with SP/IL/NMS composite membrane doped with non-functionalized mesoporous silica (NMS). Fourier transform infrared spectroscopy (FT-IR) analysis indicated that the components in the composite membrane were bound by intermolecular forces. In addition, an acid-base interaction was formed between -NH 2 in AMS and -SO 3 H in SPEEK. The acid-base pair is beneficial to proton conduction. The anhydrous proton conductivity of SP/IL/3-AMS-7.5 composite membrane is about 4 times higher than that of the SP/IL/NMS-7.5. In addition, the good interfacial compatibility between AMS and polymer matrix is conducive for creation continuous proton transfer channel. Thermogravimetric analysis (TG) showed that all composite membranes were stable at 270 °C. The leaching of IL data indicated that IL can be effectively retained due to the presence of -OH and -NH 2 on the NMS and AMS surfaces. The SP/IL/AMS composite membrane could be used in proton exchange membrane fuel cells under medium temperature and anhydrous conditions.
研究领域:
材料科学
·
高分子化学
·
能源材料
·
燃料电池
·
膜科学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Min Yang,Yujia Yan,Enzhou Liu,Qian Sun,Jun Fan
In recent years, all-inorganic perovskite has been extensively studied due to its excellent photoelectric properties, but the application of Cs n PbBr 2+ n perovskite with excellent stability in the field of chemical sensing has yet to be developed. Herein, Cs 4 PbBr 6 /CsPbBr 3 with good stability was successfully prepared by controlling the synthesis temperature to 100 ° C. The fluorescence intensity of Cs 4 PbBr 6 /CsPbBr 3 exhibited 2,4-dinitriphenylhydrazine (DNPH) concentration-dependent characteristics and could be used for sensing DNPH based on the dynamic quenching process triggered by the collision between Cs 4 PbBr 6 /CsPbBr 3 and DNPH. A good linear model was established based on the detection signal and DNPH concentration in the range of 0.05∼30 mg/L and the detection limit was 0.033 mg/L. This method was applied to detect DNPH in soil and tap water samples with satisfactory results obtained. Therefore, this research broadens the application of Cs n PbBr 2+ n in the field of quantitative detection and is expected to be developed into a fluorescent sensor for the detection of hydrazine substances.
研究领域:
分析化学
·
材料科学
·
环境监测
·
传感器技术
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2015
·
IF 2.729
Tingxuan Wu,Zhiguang Liu,Yujing Guo,Chuan Dong
In this work, a simple and highly sensitive electrochemical method was developed to detect luteolin based on thio-β-cyclodextrin functionalized graphene/gold nanoparticles modified glassy carbon electrode (SH-β-CD-GNs/AuNPs/GCE). The peak currents of luteolin on the SH-β-CD-GNs/AuNPs/GCE can be greatly enhanced compared to the SH-β-CD-GNs/GCE and the bare GCE. It suggests that the nanocomposite not only shows the excellent electrical properties of GNs and AuNPs but also exhibits higher enrichment ability of cyclodextrins via the host-guest interaction between cyclodextrin and luteolin . At the SH-β-CD-GNs/AuNPs/GCE, the peak currents increased linearly with the concentration of luteolin in the range of 10.0 pM to 10.0 μM. The detection limit was estimated to be 3.3 pM (S/N = 3), which was more sensitive or comparable with the previous electrochemical sensors for luteolin detection. The analytical performance of this sensor has been evaluated for the detection of luteolin in human serum with satisfactory results. Furthermore, the method might open up a new possibility by using the nanohybrids to monitor other flavonoids which can form host–guest complexes with cyclodextrins.
研究领域:
分析化学
·
纳米生物技术
·
电分析化学
·
药物代谢
·
生物传感器
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Chang Chen,Kwok-ho Lam,Bao-jun Liu,Xian-hua Hou,Yu-ping Wu
Chemically integrated hybrid quantum dots ZnCo 2 O 4 /reduced graphene oxide (QDs ZCO/rGO) sheets nanocomposites are synthesized through polyol processes. rGO sheets grow and interweave to form basic skeletons. Ultrafine ZCO particles with a size of around 3.66 nm grow and embed on both sides of the rGO sheets, and the rGO sheets restrain the reunion of ZCO nanoparticles . The existence of rGO sheets and ZCO nanoparticles can engender the mutual synergistic effects so that hybrid QDs ZCO/rGO electrodes exhibit the excellent electrochemical properties . Owing to this special nanoparticles-on-sheets structure, the hybrid QDs ZCO/rGO electrodes exhibit an excellent initial discharge capacity for rechargeable lithium-ion batteries (1325.9 mAh g −1 at the current density of 200 mA g −1 ), high rate stability (532.3/566.1 mAh g −1 at 4000 mA g −1 ) and outstanding electrochemical cyclic stability (657.6/668.2 mAh g −1 at 2000 mA g −1 after 2000 cycles with a capacity retention of 68.6%). For full-cells, high initial reversible discharging capacity (646 mAh g −1 at 200 mA g −1 ) and good cyclic stability (514 mAh g −1 at 200 mA g −1 after 100 cycles) are obtained. The superior performance of the as-prepared electrodes is ascribed to the advantage of nano-sized particles. With the successful synthesis of hybrid QDs ZCO/rGO nanocomposites, the facile synthetic route and unique growth of nanostructuring method can be extended to high electrochemical performance electrodes for commercial lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
·
先进电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）