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Ag/Bi_(2)O_(3)纳米块自供能紫外探测器的制备及性能
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作者 方向明 周起成 +3 位作者 孙宇 乔志铭 耿秋丹 高世勇 《光学精密工程》 EI CAS CSCD 北大核心 2024年第5期653-660,共8页
为了实现在无外部供能下对紫外光的有效探测,基于Ag修饰的Bi_(2)O_(3)纳米块(Ag/Bi_(2)O_(3))纳米块制备了自供能紫外探测器。通过煅烧法制备Bi_(2)O_(3)纳米块,随后采用室温溶液法在其表面沉积Ag纳米粒子,进而成功制备了Ag/Bi_(2)O_(3... 为了实现在无外部供能下对紫外光的有效探测,基于Ag修饰的Bi_(2)O_(3)纳米块(Ag/Bi_(2)O_(3))纳米块制备了自供能紫外探测器。通过煅烧法制备Bi_(2)O_(3)纳米块,随后采用室温溶液法在其表面沉积Ag纳米粒子,进而成功制备了Ag/Bi_(2)O_(3)纳米块,且对所制备样品的晶体结构和微观形貌等进行了表征。结果表明,Ag/Bi_(2)O_(3)纳米块的平均尺寸约为1μm,且Ag纳米粒子随机分布在Bi_(2)O_(3)纳米块表面。将涂覆Ag/Bi_(2)O_(3)纳米块的FTO作为工作电极,并进一步构建了自供能紫外探测器。在365 nm的紫外光照射下,Ag/Bi_(2)O_(3)纳米块紫外探测器能在零偏压下实现对紫外光的快速检测,这证实其具有自供能特性。相比于Bi_(2)O_(3)纳米块紫外探测器,Ag/Bi_(2)O_(3)纳米块紫外探测器的光电流得到明显提升,上升和下降时间分别缩短至29.1 ms和40.2 ms,并具有良好的循环稳定性。 展开更多
关键词 紫外探测器 Bi_(2)o_(3)纳米块 AG纳米粒子 自供能探测
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纳米α-Fe_(2)O_(3)/壳聚糖修饰玻碳电极的电化学行为研究
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作者 陈丽娟 黄惠 沈培辉 《化工新型材料》 CAS CSCD 北大核心 2024年第9期149-153,162,共6页
通过不同温度煅烧获得不同比表面积的α-Fe_(2)O_(3)纳米颗粒,将纳米α-Fe_(2)O_(3)与壳聚糖制成复合材料。利用滴涂法,将纳米α-Fe_(2)O_(3)/壳聚糖复合材料修饰在玻碳电极上,并通过循环伏安法研究纳米α-Fe_(2)O_(3)/壳聚糖/玻碳电极... 通过不同温度煅烧获得不同比表面积的α-Fe_(2)O_(3)纳米颗粒,将纳米α-Fe_(2)O_(3)与壳聚糖制成复合材料。利用滴涂法,将纳米α-Fe_(2)O_(3)/壳聚糖复合材料修饰在玻碳电极上,并通过循环伏安法研究纳米α-Fe_(2)O_(3)/壳聚糖/玻碳电极对铁氰化钾电化学性能的影响。结果表明:随着烧结温度从280℃提高到700℃时,α-Fe_(2)O_(3)纳米颗粒的比表面积由136.5m^(2)/g变为2.1m^(2)/g。纳米α-Fe_(2)O_(3)/壳聚糖/玻碳电极能显著提高铁氰化钾的电化学性能,与裸电极相比,氧化和还原电流均显著提高,其电化学催化性能与其纳米α-Fe_(2)O_(3)比表面积密切相关,比表面积越大峰电流就越强。在最佳实验条件下,浓度在510^(-4)~510^(-3)mol/L范围内,铁氰化钾的还原电流与浓度呈良好的线性关系,检出限为1.25×10^(-5)mol/L,该修饰电极重复性和稳定性较好。 展开更多
关键词 纳米 α-Fe_(2)o_(3) 循环伏安法 电化学检测 铁氰化钾
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Au@α-Fe_(2)O_(3)纳米棒的制备及光催化性能
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作者 林青 黎水平 +4 位作者 缪志鹏 丁忆 梁栋 王昭 张小娟 《材料导报》 EI CAS CSCD 北大核心 2024年第3期66-71,共6页
本工作通过水热法与磁控溅射法结合成功构建了表面均匀沉积纳米Au粒子的α-Fe_(2)O_(3)(Au@α-Fe_(2)O_(3))纳米棒,纳米Au粒子的负载量和形态分别由磁控溅射时间和热处理温度调控。在沉积5.1%的纳米Au粒子后,因纳米Au的表面等离子体共振... 本工作通过水热法与磁控溅射法结合成功构建了表面均匀沉积纳米Au粒子的α-Fe_(2)O_(3)(Au@α-Fe_(2)O_(3))纳米棒,纳米Au粒子的负载量和形态分别由磁控溅射时间和热处理温度调控。在沉积5.1%的纳米Au粒子后,因纳米Au的表面等离子体共振(SPR)效应,Au@α-Fe_(2)O_(3)纳米棒在550 nm处出现了一个新的吸收峰,其带隙由2.20 eV变窄至1.95 eV。Au@α-Fe_(2)O_(3)纳米棒的荧光强度和电化学阻抗显著降低,光电流从0.27μA·cm^(-2)增大至0.45μA·cm^(-2)。纳米Au粒子既拓宽了Au@α-Fe_(2)O_(3)纳米棒的可见光吸收性能,又抑制了电子-空穴对的复合。与α-Fe_(2)O_(3)纳米棒相比,Au@α-Fe_(2)O_(3)纳米棒的光催化性能变得更加稳定,Au@α-Fe_(2)O_(3)纳米棒的光催化效率提高约一倍。 展开更多
关键词 纳米金 α-Fe_(2)o_(3) 纳米棒 光催化性能
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Al_(2)O_(3)/SiO_(2)混合纳米流体微量润滑铣削润滑性能评价
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作者 柏秀芳 董兰 +2 位作者 宋宇翔 胡树国 李长河 《制造技术与机床》 北大核心 2024年第10期29-34,共6页
由于不同纳米粒子组成的混合纳米流体比单一纳米粒子切削液具有更好的热物理性能,研究了纯Al_(2)O_(3)、纯SiO_(2)和不同质量比混合纳米流体微量润滑(minimum quantity lubrication,MQL)铣削45号钢的切削性能。试验结果表明,混合纳米流... 由于不同纳米粒子组成的混合纳米流体比单一纳米粒子切削液具有更好的热物理性能,研究了纯Al_(2)O_(3)、纯SiO_(2)和不同质量比混合纳米流体微量润滑(minimum quantity lubrication,MQL)铣削45号钢的切削性能。试验结果表明,混合纳米流体比纯SiO_(2)铣削力降低,接触角减小,工件微观形貌好。不同配比的混合纳米粒子展现出了不同的润滑效果。当Al_(2)O_(3)的配比小于SiO_(2)时,Al_(2)O_(3)纳米粒子未完全包覆住SiO_(2),润滑效果较差。随着Al_(2)O_(3)比例增加,切削力和接触角都显著减小,工件表面质量提高。当Al_(2)O_(3)和SiO_(2)的质量比为3∶1时,得到的铣削力、表面粗糙度和接触角最小,工件表面质量最好。由此可见,Al_(2)O_(3)的含量影响了混合纳米流体的润滑效果。 展开更多
关键词 铣削 微量润滑 混合纳米流体 润滑性能 Al_(2)o_(3)纳米粒子
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Fe_(3)O_(4)@SiO_(2)磁性吸附剂的制备及其对Er(Ⅲ)和Ho(Ⅲ)的吸附性能
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作者 周键 昝苗苗 +1 位作者 肖燕飞 刘嘉铭 《江西冶金》 2024年第1期53-57,共5页
稀土资源的开采伴随着稀土离子排放,对水资源造成了严重污染。吸附法是处理水相稀土离子污染的一种高效技术,磁性吸附剂能够加速固液分离,具有较大的研究价值。本研究以FeCl_(3)·6H_(2)O、甘醇、醋酸钠、聚乙二醇(PEG2000)等为原料... 稀土资源的开采伴随着稀土离子排放,对水资源造成了严重污染。吸附法是处理水相稀土离子污染的一种高效技术,磁性吸附剂能够加速固液分离,具有较大的研究价值。本研究以FeCl_(3)·6H_(2)O、甘醇、醋酸钠、聚乙二醇(PEG2000)等为原料,采用溶剂热法在200℃的条件下制备粒径约为230 nm的Fe_(3)O_(4)磁性纳米颗粒,将其加入正硅酸乙酯中,利用氨水水解聚合,即可形成粒径约为300 nm的Fe_(3)O_(4)@SiO_(2)磁性吸附剂材料。此复合材料为核壳结构,包含Fe_(3)O_(4)和SiO_(2)两种晶型结构。SiO_(2)的包覆未对Fe_(3)O_(4)物相结构产生较大影响,在包覆的同时能够显现出一定的磁性性能。此复合材料对Er(Ⅲ)和Ho(Ⅲ)的最大吸附容量分别达到10.03 mg/g和5.25 mg/g。 展开更多
关键词 Fe_(3)o_(4)磁性纳米粒子 Fe_(3)o_(4)@Sio_(2) 核壳结构 Er(Ⅲ) Ho(Ⅲ)
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离子液体表面活性剂模板控制Nd_(2)O_(3)纳米颗粒的合成和形貌演化研究
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作者 高习贵 李瑞宏 +4 位作者 孙明华 程文琳 侯福运 文贵苗 师庄秀 《中国资源综合利用》 2024年第5期48-55,共8页
研制一种新型离子液体表面活性剂模板,用于合成具有不同形态的单分散钕纳米颗粒。研究表面活性剂浓度和种类对制备过程的影响,采用多种分析技术对前驱体和Nd_(2)O_(3)纳米颗粒进行测定。结果表明,添加的表面活性剂椰油酰胺丙基甜菜碱(Co... 研制一种新型离子液体表面活性剂模板,用于合成具有不同形态的单分散钕纳米颗粒。研究表面活性剂浓度和种类对制备过程的影响,采用多种分析技术对前驱体和Nd_(2)O_(3)纳米颗粒进行测定。结果表明,添加的表面活性剂椰油酰胺丙基甜菜碱(Cocoamidopropyl Betaine,CAPB)或1-十四烷基-3-甲基咪唑氯([C14mim]Cl)离子液体对产物有很大影响。随着CAPB浓度从0到20倍临界胶束浓度(Critical Micelle Concentration,CMC)的增加,Nd_(2)O_(3)的形貌从短纳米棒、纳米球、不规则薄片和高度规则的叶状纳米颗粒向环球形纳米颗粒转变,上述Nd_(2)O_(3)的物相都相同。然而,从形貌来看,添加[C14mim]Cl制备的Nd_(2)O_(3)与添加CAPB制备的Nd_(2)O_(3)有很大不同。表面活性剂浓度影响沉淀过程,表面活性剂形成不同的胶束结构,作为引导沉淀反应的液体模板。该合成过程简单,离子液体表面活性剂可用于制备纳米颗粒,组装具有新结构和新功能的纳米材料。 展开更多
关键词 Nd_(2)o_(3) 纳米颗粒 离子液体表面活性剂 胶束 液体模板 合成 形貌演化
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“新工科”背景下生物制药专业多学科交叉融合的探索研究——以Fe_(3)O_(4)@SiO_(2)核壳磁性纳米粒子的制备及应用实验为例
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作者 相欣然 李文瑄 《广东化工》 CAS 2024年第5期164-167,共4页
“新工科”背景下,多学科交叉融合已成为生物制药专业教学育人的新方式,对培养“明德求真,弘药济世”的卓越应用型工程人才具有重要意义。本文将以Fe_(3)O_(4)@SiO_(2)核壳磁性纳米粒子的制备及应用实验为例,顺应教育部“三全育人”的... “新工科”背景下,多学科交叉融合已成为生物制药专业教学育人的新方式,对培养“明德求真,弘药济世”的卓越应用型工程人才具有重要意义。本文将以Fe_(3)O_(4)@SiO_(2)核壳磁性纳米粒子的制备及应用实验为例,顺应教育部“三全育人”的战略要求,在调动学生科研的积极性和主动性的同时,探索生物制药与有机化学之间的联系,挖掘多学科交叉融合的独特优势,提高学生的科学探究能力和实验操作能力。 展开更多
关键词 新工科 多学科交叉融合 纳米技术 Fe_(3)o_(4)@Sio_(2)核壳磁性纳米粒子 DNA提取
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Effect of Fe_(2)O_(3)nanoparticle on the interface microstructure and properties of Al/Cu plasma arc fusion-brazing joints
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作者 李岩 杨楠 +2 位作者 樊丁 黄健康 张欢 《China Welding》 CAS 2023年第3期10-20,共11页
The lap joint of T2 copper plate and 1060 pure aluminum plate was made by using the plasma arc welding method with adding Fe_(2)O_(3)nanoparticles in different proportions.The research analysis found that the thicknes... The lap joint of T2 copper plate and 1060 pure aluminum plate was made by using the plasma arc welding method with adding Fe_(2)O_(3)nanoparticles in different proportions.The research analysis found that the thickness of the IMC(intermetallic compound)and eutect-ic region decreased after the addition of nanoparticles due to its inhibitory effect.When the proportion of Fe_(2)O_(3)nanoparticles is 3%,the in-terface intermetallic compound layer is the thinnest.However,after this ratio is continuously increased,the inhibition effect is weakened by the agglomeration of nanoparticles,and the thickness begins to increase significantly.The mechanical and electrical properties of the joint are mainly affected by the thickness of the IMC layer.Excessive nanoparticles are agglomerated into large particles with high resistivity.Therefore,the tensile strength and relative electrical conductivity of the joint are first increasing and then decreasing with the increase of nanoparticle ratio.When the proportion of nanoparticles is 3%,the tensile strength and electrical conductivity are maximum. 展开更多
关键词 Aluminum-copper dissimilar metals Fe_(2)o_(3)nanoparticles intermetallic compound mechanical properties conductive properties
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Inhibitory effect of humanized anti-VEGFR-2 ScFv-As_2O_3-stealth nanoparticles conjugate on growth of human hepatocellular carcinoma:in vitro and in vivo studies 被引量:5
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作者 Xiang-Bao Yin Lin-Quan Wu +5 位作者 Hua-Qun Fu Ming-Wen Huang Kai Wang Fan Zhou Xin Yu Kai-Yang Wang 《Asian Pacific Journal of Tropical Medicine》 SCIE CAS 2014年第5期337-343,共7页
Objective:To investigate the inhibitory effect of humanized anti-VEGFR-2 ScFv-As2O3-stealth nanoparticles conjugate on growth of human hepatocellular carcinoma both in vitro and in vivo,which may be a potential agents... Objective:To investigate the inhibitory effect of humanized anti-VEGFR-2 ScFv-As2O3-stealth nanoparticles conjugate on growth of human hepatocellular carcinoma both in vitro and in vivo,which may be a potential agents with sensitivity and targeting ability for human hepatocellular cancer.Methods:Humanized anli-VECFR-2 ScFv-As2O3-stealth nanoparticles conjugate was previously constructed using ribosome display technology and antibody conjugate technology.In this combined in vitro and in vivo study,the inhibitory effects of anti-VEGFR-2 ScFv-As2O3-stealth nanoparticles conjugate on tumor growth,invasion,and metastasis was observed with human liver carcinoma cell line Bel7402 and normal cell L02 by MTT assay,Tanswell assay,Hochest33258 staining,and DNA ladder analysis.The anticancer activity and distribution of anti-VEGFR-2 ScFv-As2O3-stealth nanoparticles was then verified in a mouse model of Bel7402xenografts.Results:Anti-VEGFR-2 ScFv-As2O3-stealth nanoparticles significantly inhibited the proliferation of Bel7402 in the 3-(4,5-dimethylthiazol-2-yh-2,5-diphenyltetrazolium bromide assay while had almost no effects on L02 cells.And the apoptosis inducing effects were proved by Hochest33258 staining and DNA ladder analysis.Transwell assay found that the drug also inhibited the metastasis ability of tumor cells.Furthermore,anti-VEGFR-2 ScFv-As^-stealth nanoparticles significantly delayed the growth of Bel7402 xenografts after administration(92.9%),followed by As2O3-stealth nanoparticles,anti-VEGFR-2 ScFv,and As203(61.4%,58.8%,20.5%,P【0.05).The concentration of As2O3 in anti-VEGFR-2 ScFv-As2O3-steallh nanoparticles group was more selectively.Conclusions:Anti-VEGFR-2 ScFv-As2O3-stealth nanoparticles is a potent and selective anti-hepatocellular carcinoma agent which could inhibit the growth of liver cancer as a targeting agent both in vitro and in vivo and also significantly inhibit angiogenesis. 展开更多
关键词 Anti-VEGFR-2 single-chain antibody conjugate As_2o_3 stealth nanoparticles Hepatocellular carcinoma
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One-step hydrothermal synthesis of Sn-doped α-Fe_(2)O_(3) nanoparticles for enhanced photocatalytic degradation of Congo red 被引量:2
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作者 Van Nang Lam Thi Bich Vu +5 位作者 Quang Dat Do Thi Thanh Xuan Le Tien Dai Nguyen T-Thanh-Bao Nguyen Hoang Tung Do Thi Tu Oanh Nguyen 《Journal of Semiconductors》 EI CAS CSCD 2022年第12期22-31,共10页
We report on the synthesis of Sn-doped hematite nanoparticles(Sn-α-Fe_(2)O_(3) NPs)by the hydrothermal method.The prepared Sn-α-Fe_(2)O_(3) NPs had a highly pure and well crystalline rhombohedral phase with an avera... We report on the synthesis of Sn-doped hematite nanoparticles(Sn-α-Fe_(2)O_(3) NPs)by the hydrothermal method.The prepared Sn-α-Fe_(2)O_(3) NPs had a highly pure and well crystalline rhombohedral phase with an average particle size of 41.4 nm.The optical properties of as-synthesizedα-Fe_(2)O_(3) NPs show a higher bandgap energy(2.40-2.57 eV)than that of pure bulkα-Fe_(2)O_(3)(2.1 eV).By doping Sn intoα-Fe_(2)O_(3) NPs,the Sn-doped hematite was observed a redshift toward a long wavelength with in-creasing Sn concentration from 0%to 4.0%.The photocatalytic activity of Sn-dopedα-Fe_(2)O_(3) NPs was evaluated by Congo red(CR)dye degradation.The degradation efficiency of CR dye using Sn-α-Fe_(2)O_(3) NPs catalyst is higher than that of pureα-Fe_(2)O_(3) NPs.The highest degradation efficiency of CR dye was 97.8%using 2.5%Sn-dopedα-Fe_(2)O_(3) NPs catalyst under visible-light irradi-ation.These results suggest that the synthesized Sn-dopedα-Fe_(2)O_(3) nanoparticles might be a suitable approach to develop a photocatalytic degradation of toxic inorganic dye in wastewater. 展开更多
关键词 α-Fe_(2)o_(3)nanoparticles Sn Congo red photocatalytic properties PHoToDEGRADATIoN
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Up/down-conversion luminescence of monoclinic Gd_(2)O_(3):Er^(3+)nanoparticles prepared by laser ablation in liquid
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作者 Hua-Wei Deng Di-Hu Chen 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第7期49-55,共7页
Multifunctional luminescent materials are attracting attention nowadays.In this work,monoclinic Gd_(2)O_(3):Er^(3+)nanoparticles,which possess up-conversion luminescence and down-conversion luminescence properties,wer... Multifunctional luminescent materials are attracting attention nowadays.In this work,monoclinic Gd_(2)O_(3):Er^(3+)nanoparticles,which possess up-conversion luminescence and down-conversion luminescence properties,were successfully synthesized by laser ablation in liquid(LAL)technique.Up-conversion luminescence and down-conversion luminescence of monoclinic Gd_(2)O_(3):Er^(3+)nanoparticles were got under the excitation of 980 nm and 379 nm,respectively.In addition,tunable luminescence was got.Furthermore,the cytotoxicity of the nanoparticles is low and the fluorescence of the nanoparticles in cell is also strong enough.The results indicate that the Gd_(2)O_(3):Er^(3+)nanoparticles synthesized by LAL technique are promising candidates for bio-imaging or other fields that require controllable fluorescence. 展开更多
关键词 Gd_(2)o_(3) nanoparticles LUMINESCENCE laser ablation in liquid
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负载γ-Fe_(2)O_(3)的壳聚糖多孔海绵对大鼠骨髓间质干细胞增殖和成骨分化的影响 被引量:3
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作者 孙上雯 陈汉帮 +1 位作者 胡姝颖 章非敏 《南京医科大学学报(自然科学版)》 CAS 北大核心 2023年第3期326-333,共8页
目的:研究负载γ-Fe_(2)O_(3)的壳聚糖多孔海绵对大鼠骨髓间充质干细胞(rat bone marrow mesenchymal stem cell,r BMSC)增殖和成骨分化的影响。方法:使用冻干-交联法制备负载γ-Fe_(2)O_(3)浓度分别为1%、5%、10%和20%的壳聚糖海绵,并... 目的:研究负载γ-Fe_(2)O_(3)的壳聚糖多孔海绵对大鼠骨髓间充质干细胞(rat bone marrow mesenchymal stem cell,r BMSC)增殖和成骨分化的影响。方法:使用冻干-交联法制备负载γ-Fe_(2)O_(3)浓度分别为1%、5%、10%和20%的壳聚糖海绵,并制备空白对照组。将rBMSC培养于海绵上,通过扫描电镜和共聚焦显微镜观察细胞黏附及增殖情况,通过CCK-8法检测细胞第1、3、5、7天的增殖情况,通过碱性磷酸酶(alkaline phosphatases,ALP)染色及活性检测和荧光定量PCR检测第7、14天ALP活性和成骨指标ALP、骨形态发生蛋白(bone morphogenetic protein 2,Bmp2)、胶原蛋白(collagenⅠ,Col1)和Runt相关转录因子2(core binding factor alphal 1,Runx2)的表达;使用茜素红定量法评估第21、28天细胞外基质矿化情况。结果:CCK-8结果显示rBMSC均能在材料上持续增殖,添加γ-Fe_(2)O_(3)对rBMSC增殖有促进作用;ALP染色及活性检测结果和PCR结果显示添加γ-Fe_(2)O_(3)能提高ALP活性并促进成骨指标表达;茜素红定量结果显示添加浓度为5%和10%时,矿化物形成量高于对照组(P <0.05)。结论:负载γ-Fe_(2)O_(3)的壳聚糖海绵能够促进rBMSC的增殖和早期成骨分化,浓度为5%和10%时对rBMSC成骨分化晚期矿化物形成有促进作用。 展开更多
关键词 γ-Fe_(2)o_(3)磁性纳米颗粒 壳聚糖多孔海绵 骨组织工程 成骨分化
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Electronic structure modulation with ultrafine Fe_(3)O_(4) nanoparticles on 2D Ni-based metal-organic framework layers for enhanced oxygen evolution reaction
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作者 Wei Huang Chao Peng +7 位作者 Jing Tang Fangyuan Diao Murat Nulati Yesibolati Hongyu Sun Christian Engelbrekt Jingdong Zhang Xinxin Xiao Kristian S.Mølhave 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第2期78-88,共11页
Two-dimensional(2D)metal organic frameworks(MOFs)are emerging as low-cost oxygen evolution reaction(OER)electrocatalysts,however,suffering aggregation and poor operation stability.Herein,ultrafine Fe_(3)O_(4) nanopart... Two-dimensional(2D)metal organic frameworks(MOFs)are emerging as low-cost oxygen evolution reaction(OER)electrocatalysts,however,suffering aggregation and poor operation stability.Herein,ultrafine Fe_(3)O_(4) nanoparticles(diameter:6±2 nm)are homogeneously immobilized on 2D Ni based MOFs(Ni-BDC,thickness:5±1 nm)to improve the OER stability.Electronic structure modulation for enhanced catalytic activity is studied via adjusting the amount of Fe_(3)O_(4) nanoparticles on Ni-BDC.The optimal Fe_(3)O_(4)/Ni-BDC achieves the best OER performance with an overpotential of 295 mV at 10 mA cm^(-2),a Tafel slope of 47.8 mV dec^(-1) and a considerable catalytic durability of more than 40 h(less than 5 h for Ni-BDC alone).DFT calculations confirm that the active sites for Fe_(3)O_(4)/Ni-BDC are mainly contributed by Fe species with a higher oxidation state,and the potential-determining step(PDS)is the formation of the adsorbed O*species,which are facilitated in the composite. 展开更多
关键词 Fe_(3)o_(4)nanoparticles 2D Ni-BDC Aggregation Electronic structure modulation oxygen evolution reaction
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Stability of liquid crystal systems doped withγ-Fe_(2)O_(3)nanoparticles
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作者 Xu Zhang Ningning Liu +9 位作者 Zongyuan Tang Yingning Miao Xiangshen Meng Zhenghong He Jian Li Minglei Cai Tongzhou Zhao Changyong Yang Hongyu Xing Wenjiang Ye 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第9期364-370,共7页
In order to explore the stability of a liquid crystal(LC)system doped withγ-Fe_(2)O_(3)nanoparticles,the physical properties(clearing point,dielectric properties),electro-optical properties and residual direct-curren... In order to explore the stability of a liquid crystal(LC)system doped withγ-Fe_(2)O_(3)nanoparticles,the physical properties(clearing point,dielectric properties),electro-optical properties and residual direct-current voltage(RDCV)of the doped LC system were measured and evaluated at different times.First,the temperature was controlled by precision hot stage,and the clearing point temperature of doped LC was observed and measured by a polarized optical microscope.Using a precision LCR meter,we measured the capacitance-voltage curves of the doped LC system at the temperature of 27℃.The dielectric constant of doped LC was calculated by the dualcell capacitance method.Then,the electro-optical properties of the doped LC system were measured.Finally,the RDCV of the doped LC system was measured and calculated.After five months,the parameters of the doped LC system were re-measured and analyzed under the same conditions to evaluate its stability.The experimental results show that,within five months,the clearing point change rate of doped LC is in the range of 0.24%-1.37%,the change of dielectric anisotropy is in the range of 0.035-0.2,the curves of electro-optical properties are basically fitted,and the change rate of saturated RDCV is about 11.2%,which basically indicate that the LC system doped withγ-Fe_(2)O_(3)nanoparticles has good stability. 展开更多
关键词 γ-Fe_(2)o_(3)nanoparticles stability of liquid crystal system clearing point dielectric properties electro-optical properties
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超高频脉冲电流作用下纳米Al_(2)O_(3)颗粒对Mg-Gd-Y-Zr合金微弧氧化涂层的影响
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作者 刘晓鹤 师春晓 +3 位作者 张博 刘磊 董帅 董杰 《表面技术》 EI CAS CSCD 北大核心 2023年第6期41-50,共10页
目的进一步提高Mg-Gd-Y-Zr合金微弧氧化涂层的耐腐蚀性能。方法采用超高频微弧氧化技术在含有Al_(2)O_(3)纳米颗粒的溶液中制备了微弧氧化涂层。利用扫描电子显微镜(FESEM)、能谱仪(EDS)和X射线衍射仪(XRD)对微弧氧化涂层的表面形貌、... 目的进一步提高Mg-Gd-Y-Zr合金微弧氧化涂层的耐腐蚀性能。方法采用超高频微弧氧化技术在含有Al_(2)O_(3)纳米颗粒的溶液中制备了微弧氧化涂层。利用扫描电子显微镜(FESEM)、能谱仪(EDS)和X射线衍射仪(XRD)对微弧氧化涂层的表面形貌、截面形貌、成分和晶体结构进行分析。利用极化曲线和电化学阻抗谱(EIS)测试了涂层的耐腐蚀性能。结果频率由0.5 kHz提升至20 kHz后,涂层表面放电孔洞面积由0.07~24.4μm^(2)降低至0.08~6.3μm^(2),涂层的孔隙率由6.47%减小至3.35%。Al_(2)O_(3)纳米颗粒的添加使超高频涂层表面形成大量自封闭孔洞结构,进而进一步降低了涂层表面的孔径面积(0.1~4.63μm^(2))和孔隙率(0.97%)。极化试验表明,提高频率至20 kHz,涂层的自腐蚀电流密度由4.7×10^(-6)A/cm^(2)降低至4.7×10^(-7)A/cm^(2),添加Al_(2)O_(3)纳米颗粒,涂层的自腐蚀电流密度进一步降低至1.7×10^(-7)A/cm^(2),表明其耐蚀性能显著提高。阻抗谱显示,20 kHz-Al涂层具有最大的阻抗,说明该工艺可有效提高微弧氧化涂层的耐蚀性能。结论超高频可有效降低放电孔洞尺寸,提高微弧氧化涂层的致密性,改善涂层的耐腐蚀性能。超高频与Al_(2)O_(3)纳米粒子的协同作用使涂层表面形成自封闭孔洞结构,进一步提高微弧氧化涂层的致密性和耐腐蚀性能。 展开更多
关键词 镁合金 微弧氧化 超高频 Al_(2)o_(3)纳米颗粒 电化学 耐腐蚀性能
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铁精粉制备α-Fe_(2)O_(3)纳米粒子及其机理
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作者 李婷 裴文利 +1 位作者 陈婉晴 佟冰 《东北大学学报(自然科学版)》 EI CAS CSCD 北大核心 2023年第2期206-214,共9页
采用商业磁铁矿铁精粉(Fe_(3)O_(4)),设计了提纯和制备工艺,成功制备出质量分数为99.5%以上、分散性良好的α-Fe_(2)O_(3)纳米粒子,对其提纯、制备工艺及机理进行了深入研究.结果表明:w NaOH对除硅效果影响显著,当w NaOH为39%时,可使原... 采用商业磁铁矿铁精粉(Fe_(3)O_(4)),设计了提纯和制备工艺,成功制备出质量分数为99.5%以上、分散性良好的α-Fe_(2)O_(3)纳米粒子,对其提纯、制备工艺及机理进行了深入研究.结果表明:w NaOH对除硅效果影响显著,当w NaOH为39%时,可使原料矿粉中w SiO 2由1.11%降至0.032%,得到较纯铁精粉;随烧结温度的升高,α-Fe_(2)O_(3)颗粒的结晶度、形貌特征及磁性能随之发生变化;当烧结温度为670℃时,α-Fe_(2)O_(3)颗粒综合性能最佳,颗粒结晶度较高、分散性较好,具有亚铁磁性;通过对氢氧化铁沉淀物加热搅拌时间的控制,可有效调控α-Fe_(2)O_(3)的晶粒尺寸;当搅拌时间为60 min时,获得分散性好、平均粒径仅为35.3 nm的α-Fe_(2)O_(3)纳米粒子. 展开更多
关键词 α-Fe_(2)o_(3) 铁精粉 纳米颗粒 晶粒尺寸 分散性
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MgGa_(2)O_(4)∶Cr^(3+),Al^(3+)近红外发光长余辉纳米粒子的制备及发光性能研究
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作者 孙雪峰 赵天骐 +3 位作者 热娜古丽·阿不都热合曼 杨倩婷 杨通胜 茹鲜古丽·艾外力 《化工新型材料》 CAS CSCD 北大核心 2023年第12期97-101,107,共6页
利用乙二醇辅助共沉淀法,制备了小尺寸近红外发光Al^(3+)共掺杂镓酸镁(MgGa_(2)O_(4))∶0.3%Cr^(3+)(MGO∶0.3%Cr^(3+),Al^(3+))长余辉发光纳米粒子(PLNP),考察了Al^(3+)掺杂对MGO∶0.3%Cr^(3+)晶体结构和光学性质的影响。研究结果表明,... 利用乙二醇辅助共沉淀法,制备了小尺寸近红外发光Al^(3+)共掺杂镓酸镁(MgGa_(2)O_(4))∶0.3%Cr^(3+)(MGO∶0.3%Cr^(3+),Al^(3+))长余辉发光纳米粒子(PLNP),考察了Al^(3+)掺杂对MGO∶0.3%Cr^(3+)晶体结构和光学性质的影响。研究结果表明,Al^(3+)掺杂对MGO∶0.3%Cr^(3+)的晶体结构无影响,但能提高MGO∶0.3%Cr^(3+)的发光强度。当Al^(3+)掺杂量为0.4%(摩尔分数)时,MGO∶0.3%Cr^(3+),0.4%Al^(3+)(Al^(3+)、Cr^(3+)相对于Ga^(3+)的物质的量比,摩尔分数)PLNP发光强度最强,余辉平均发光寿命从46.98s(MGO∶0.3%Cr^(3+))增大至78.75s(MGO∶0.3%Cr^(3+),0.4%Al^(3+)),平均粒径为(6.53±1.79)nm。本研究为制备小尺寸和高发光强度的PLNP提供了一种有效的方法。此外,高发光强度和长余辉寿命的MGO∶0.3%Cr^(3+),0.4%Al^(3+) PLNP为光学传感、成像和治疗等提供了材料支撑。 展开更多
关键词 Al^(3+)共掺杂 共沉淀法 小尺寸 长余辉发光纳米粒子 镓酸镁(MgGa_(2)o_(4))
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Sensitive and selective electrochemical sensor for the detection of dopamine by using AuPd@Fe_(2)O_(3) nanoparticles as catalyst
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作者 Mengjiao Dai Qunyan Zhu +2 位作者 Dongxue Han Li Niu Zhenxin Wang 《Advanced Sensor and Energy Materials》 2023年第1期24-31,共8页
The levels of dopamine(DA)in living organisms have strong effects on many biological processes and diseases,such as Parkinson's disease and Alzheimer's disease.Therefore,it has great significance for sensitive... The levels of dopamine(DA)in living organisms have strong effects on many biological processes and diseases,such as Parkinson's disease and Alzheimer's disease.Therefore,it has great significance for sensitive and selective detection of DA.Herein,the AuPd@Fe_(2)O_(3) nanoparticles-based electrochemical(EC)sensor(AuPd@Fe_(2)O_(3) NPs/GCE)is developed for chronoamperometric detection of DA with high sensitivity and good anti-interference ability through simple immobilization of AuPd@Fe_(2)O_(3) nanoparticles on glassy carbon electrode(GCE)by Nafion.Under the application of oxidation potential,the AuPd@Fe_(2)O_(3) NPs/GCE exhibits good electrocatalytic activity toward DA,which enables to linearly detect DA in the range of 10 nM–831.61μM(R^(2)=0.9983).The AuPd@Fe_(2)O_(3) NPs/GCE also shows good selectivity and reproducibility for the detection of DA.Furthermore,the practicability of AuPd@Fe_(2)O_(3) NPs/GCE has been demonstrated by detection of DA in dopamine hydrochloride injection and human serum. 展开更多
关键词 Electrochemical sensor aupd@fe_(2)o_(3)nanoparticles Dopamine High sensitivity Good anti-interference ability
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Al_2O_3纳米粒子增强锌铝基耐蚀涂层的制备及性能研究 被引量:4
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作者 王旭东 周伟峰 +4 位作者 孙冬柏 孟惠民 俞宏英 李辉勤 樊自拴 《材料保护》 CAS CSCD 北大核心 2006年第8期4-7,共4页
为解决锌铝基耐蚀涂层在高速、强摩擦等特殊服役条件下的使用问题,将A l2O3纳米粒子添加到锌铝基耐蚀涂层中进行改性,以提高涂层的硬度和耐蚀性。研究了A l2O3纳米粒子及其添加量对涂层硬度、摩擦系数、附着强度、耐冲击性能和耐腐蚀性... 为解决锌铝基耐蚀涂层在高速、强摩擦等特殊服役条件下的使用问题,将A l2O3纳米粒子添加到锌铝基耐蚀涂层中进行改性,以提高涂层的硬度和耐蚀性。研究了A l2O3纳米粒子及其添加量对涂层硬度、摩擦系数、附着强度、耐冲击性能和耐腐蚀性能的影响,并对涂层的微观组织和成分进行了分析。结果表明,添加A l2O3纳米粒子可显著提高锌铝基耐蚀涂层的硬度和耐蚀性能,降低摩擦系数,且对涂层的附着强度和耐冲击性能无负面影响。A l2O3纳米粒子在涂层中的均匀分散是获得涂层优异综合性能的必要条件。 展开更多
关键词 锌铝基耐蚀涂层 Al2o3纳米粒子 硬度 耐蚀性
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酸腐蚀法制备超细、单分散γ-Al_(2)O_(3)纳米颗粒的研究 被引量:1
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作者 王海明 李健 《塔里木大学学报》 2021年第1期50-55,共6页
采用非均匀沉淀法+酸腐蚀法制备形貌规则、窄尺寸分布、超细、单分散的γ-Al_(2)O_(3)纳米颗粒。首先,以硝酸铝、氨水为原腐蚀30 h后,制备出类球形、粒径分布为4~15 nm、平均颗粒尺寸9 nm、单分散的γ-Al_(2)O_(3)纳米颗粒,解释了可能... 采用非均匀沉淀法+酸腐蚀法制备形貌规则、窄尺寸分布、超细、单分散的γ-Al_(2)O_(3)纳米颗粒。首先,以硝酸铝、氨水为原腐蚀30 h后,制备出类球形、粒径分布为4~15 nm、平均颗粒尺寸9 nm、单分散的γ-Al_(2)O_(3)纳米颗粒,解释了可能的反应机理。这种新颖的方法在工业化生产高质量γ-Al_(2)O_(3)纳米颗粒和制作热稳定性更高的催化剂载体等方面具有重要的指导意义。 展开更多
关键词 γ-Al_(2)o_(3)纳米颗粒 单分散 超细 非均匀沉淀 酸洗腐蚀
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