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氧化铝纳米线的制备及其形成机理 被引量:22
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作者 张璐 姚素薇 +1 位作者 张卫国 王宏智 《物理化学学报》 SCIE CAS CSCD 北大核心 2005年第11期1254-1258,共5页
采用二次铝阳极氧化技术,制备高度有序的铝阳极氧化膜(AAO模板).经X射线衍射(XRD)分析,模板为无定形结构.将模板放入腐蚀液中,可获得大量无定形结构的氧化铝纳米线.模板在800℃下退火4h后,变为!-Al2O3结构,采用类似腐蚀液溶解模板,得到... 采用二次铝阳极氧化技术,制备高度有序的铝阳极氧化膜(AAO模板).经X射线衍射(XRD)分析,模板为无定形结构.将模板放入腐蚀液中,可获得大量无定形结构的氧化铝纳米线.模板在800℃下退火4h后,变为!-Al2O3结构,采用类似腐蚀液溶解模板,得到大量!-Al2O3纳米线.研究了腐蚀液种类、腐蚀时间和模板晶体结构等因素对生成氧化铝纳米线的影响,并利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和XRD对纳米线的形貌与结构进行了表征.结果表明,在多种腐蚀液中,均可获得氧化铝纳米线;随着腐蚀时间的增加,纳米线的长度增加,直径变小,长径比增大;氧化铝纳米线的晶体结构与所采用模板的晶体结构一致.此外,还采用原子力显微镜(AFM)和SEM对AAO膜的表面形貌及其结构特点进行了详细的观测,并以此为基础讨论了氧化铝纳米线的形成机理,认为AAO模板本身存在的花状微结构是形成纳米线的内因,花瓣间的凹陷部位首先被腐蚀断裂,形成氧化铝纳米线. 展开更多
关键词 多孔阳极氧化铝(AAO)膜 腐蚀法 氧化铝纳米线 形成机制
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阳极氧化铝模板法制备氧化铝纳米线——一篇配合高中化学新课标教材的阅读材料
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作者 李艳 王明召 《科学教育》 2009年第6期92-95,共4页
在新课改高中化学教材中,有关纳米材料的知识频频出现,体现了中学化学与现代化学的联系。为配合新教材的实施,本文作者编写了这篇学生阅读材料,介绍制备氧化铝纳米线的一种电化学方法——阳极氧化铝模板法,供一线教师选用。
关键词 高中化学 氧化铝纳米线 制备 阳极氧化铝模板法
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腐蚀条件对氧化铝纳米线制备的影响 被引量:2
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作者 刘巍 杜赛赛 +3 位作者 谭佳佳 徐杰 程国安 郑瑞廷 《粉末冶金材料科学与工程》 EI 2009年第2期100-104,共5页
采用阳极氧化法制备多孔阳极氧化铝(AAO)模板,研究磷酸溶液中氧化铝纳米线的化学刻蚀合成。分析磷酸溶液的浓度和反应温度对氧化铝陶瓷纳米线生长的影响,探讨化学腐蚀法制备氧化铝陶瓷纳米线的反应温度区间和溶液的浓度范围。实验结果表... 采用阳极氧化法制备多孔阳极氧化铝(AAO)模板,研究磷酸溶液中氧化铝纳米线的化学刻蚀合成。分析磷酸溶液的浓度和反应温度对氧化铝陶瓷纳米线生长的影响,探讨化学腐蚀法制备氧化铝陶瓷纳米线的反应温度区间和溶液的浓度范围。实验结果表明,腐蚀溶液的反应温度愈高或腐蚀溶液浓度愈高,纳米线出现时间愈早,生长速率愈快,最终纳米线长度愈长。氧化铝纳米线的制备与腐蚀溶液的浓度和反应温度密切相关。在浓度为4%~10%的磷酸溶液和35~60℃的温度范围内都形成氧化铝陶瓷纳米线。 展开更多
关键词 AAO模板 氧化铝纳米线 腐蚀
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阳极氧化法制备氧化铝纳米线
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作者 徐洲 濮林 +3 位作者 林子夏 李兴华 潘力佳 施毅 《微纳电子技术》 CAS 北大核心 2010年第6期340-344,356,共6页
将Al片在较高的电压下进行阳极氧化,制备了氧化铝纳米线。其形成机制主要是多孔氧化铝膜生长的同时,其微结构单元阵列在薄膜应力作用下沿薄壁处破裂,从而生成了氧化铝纳米线。扫描电镜和透射电镜观测表明,所得产物结构外形基本一致,呈... 将Al片在较高的电压下进行阳极氧化,制备了氧化铝纳米线。其形成机制主要是多孔氧化铝膜生长的同时,其微结构单元阵列在薄膜应力作用下沿薄壁处破裂,从而生成了氧化铝纳米线。扫描电镜和透射电镜观测表明,所得产物结构外形基本一致,呈凹柱面正三棱柱形,表观直径约30~300nm,长度为几微米至数十微米。采用BET法对产物的比表面积进行测量,实验值为5.8×104m2/kg,接近于理论计算值6.2×104m2/kg。实验表明,这种氧化铝一维纳米结构材料对超小Ag和CdS纳米颗粒具有较强的吸附能力,对很难用传统的过滤和离心沉淀法去除的超小纳米颗粒(直径小于10nm)也能做到有效吸附,有望成为超级吸附与过滤材料。 展开更多
关键词 氧化铝纳米线 多孔氧化铝 阳极氧化 吸附 纳米颗粒
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在铝的阳极氧化过程中氧化铝纳米线的生长
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作者 朱开贵 程竞然 +3 位作者 常明超 王武 魏文博 葛广路 《科学通报》 CAS CSCD 北大核心 2011年第14期1140-1143,共4页
在两步法制备多孔阳极氧化铝模板过程中,观察到氧化铝纳米线的生长.这种纳米线生长过程不同于通常的化学腐蚀生成过程,电场和应力的共同作用是导致氧化铝纳米线形成的主要原因,同时抛光后铝箔表面的纳米压痕也是导致纳米线形成的重要因素.
关键词 PAAO模板多孔氧化铝阳极氧化铝氧化铝纳米线
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铝阳极氧化法制备Al_2O_3纳米线 被引量:7
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作者 姚素薇 莫敏 +2 位作者 韩玉鑫 张璐 张卫国 《电镀与涂饰》 CAS CSCD 2005年第4期1-3,共3页
 采用二次铝阳极氧化法在草酸体系中制备多孔铝阳极氧化膜,用逆电剥离技术将氧化膜从铝基体上剥离。经超声清洗后,放入磷酸溶液中去除阻挡层,使纳米孔贯通。再将膜放入c=1mol/L的NaOH溶液和w=6%的铬酸、w=1 8%的磷酸混合溶液中进行溶解...  采用二次铝阳极氧化法在草酸体系中制备多孔铝阳极氧化膜,用逆电剥离技术将氧化膜从铝基体上剥离。经超声清洗后,放入磷酸溶液中去除阻挡层,使纳米孔贯通。再将膜放入c=1mol/L的NaOH溶液和w=6%的铬酸、w=1 8%的磷酸混合溶液中进行溶解,可获得Al2O3纳米线。纳米线长度为40μm,与模板厚度一致,直径为10~20nm。通孔前后铝阳极氧化膜的形貌由SEM进行表征,纳米线的形貌由SEM和TEM表征。此外,本文还结合模板在溶解过程中的实验现象,对Al2O3纳米线的形成机理进行了初步分析。 展开更多
关键词 铝阳极氧化 多孔 氧化铝纳米线
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AAO模板的湿法刻蚀研究 被引量:1
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作者 胡国锋 张海明 +3 位作者 邸文文 李育洁 高波 朱彦君 《半导体技术》 CAS CSCD 北大核心 2010年第6期531-533,576,共4页
利用二次阳极氧化法制备多孔氧化铝(AAO)模板,然后用NaOH、磷铬酸和不同质量分数的H3PO4等溶液,对AAO模板进行湿法刻蚀。研究了刻蚀时间与AAO模板质量减少之间的变化关系。结果表明,质量分数为3%的H3PO4溶液是最为温和的刻蚀剂,它在刻... 利用二次阳极氧化法制备多孔氧化铝(AAO)模板,然后用NaOH、磷铬酸和不同质量分数的H3PO4等溶液,对AAO模板进行湿法刻蚀。研究了刻蚀时间与AAO模板质量减少之间的变化关系。结果表明,质量分数为3%的H3PO4溶液是最为温和的刻蚀剂,它在刻蚀过程中AAO模板的质量减少跟刻蚀时间呈较好的线性关系。SEM测试表明,刻蚀后的AAO模板表面存在大量的氧化铝纳米线,它们是在刻蚀的过程中产生的,并影响着刻蚀速率。通过调节刻蚀时间,可实现对AAO模板的精确可控刻蚀,这对制备纳米器件具有重要意义。 展开更多
关键词 多孔氧化铝 湿法刻蚀 磷酸 氧化铝纳米线
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Preparation of Al2O3 nanowires on 7YSZ thermal barrier coatings against CMAS corrosion 被引量:7
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作者 Xiao-feng ZHANG Shao-peng NIU +5 位作者 Zi-qian DENG Min LIU Hong LI Chun-ming DENG Chang-guang DENG Ke-song ZHOU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第11期2362-2370,共9页
The commonly-employed material for thermal barrier coatings(TBCs)is 7 wt.%Y2O3 ZrO2(7YSZ),generally deposited by electron beam-physical vapor deposition(EB-PVD).Due to the increasing demand for higher operating temper... The commonly-employed material for thermal barrier coatings(TBCs)is 7 wt.%Y2O3 ZrO2(7YSZ),generally deposited by electron beam-physical vapor deposition(EB-PVD).Due to the increasing demand for higher operating temperature in aero-derivative gas turbines,a lot of effort has been made to prevent the premature failure of columnar 7YSZ TBCs,which is induced by the microstructure degradation,sintering and spallation after the deposition of infiltrated siliceous mineral(consisting of calcium magnesium aluminum silicate(CaO MgO Al2O3 SiO2,i.e.,CMAS)).A new method called Al-modification for columnar 7YSZ TBCs against CMAS corrosion was present.The Al film was magnetron-sputtered on the surface of the columnar 7YSZ TBCs,followed by performing vacuum heat treatment of the Al-deposited TBCs.During the heat treatment,the molten Al reacted with ZrO2 to formα-Al2O3 overlay that effectively hindered CMAS infiltration.Moreover,the Al film could evaporate and re-nucleate,leading to the generation of Al2O3 nanowires,which further restrained the moving of molten CMAS. 展开更多
关键词 thermal barrier coating CMAS corrosion Al-modification Al2O3 nanowires
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Molecular dynamics analysis on bending mechanical behavior of alumina nanowires at different loading rates 被引量:3
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作者 Yuxiao James HE Bin MA 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第11期3687-3698,共12页
The molecular dynamics(MD)model ofα-Al_(2)O_(3) nanowires in bending is established by using LAMMPS to calculate the atomic stress and strain at different loading rates in order to study the effect of loading rate on... The molecular dynamics(MD)model ofα-Al_(2)O_(3) nanowires in bending is established by using LAMMPS to calculate the atomic stress and strain at different loading rates in order to study the effect of loading rate on the bending mechanical behaviors of theα-Al_(2)O_(3) nanowires.Research results show that the maximum surface stress−rotation angle curves ofα-Al_(2)O_(3) nanowires at different loading rates are all divided into three stages of elastic deformation,plastic deformation and failure,where the elastic limit point can be determined by the curve symmetry during loading and unloading cycle.The loading rate has great influence on the plastic deformation but little on the elastic modulus ofα-Al_(2)O_(3) nanowires.When the loading rate is increased,the plastic deformation stage is shortened and the material is easier to fail in brittle fracture.Therefore,the elastic limit and the strength limit(determined by the direct and indirect MD simulation methods)are closer to each other.The MD simulation result ofα-Al_(2)O_(3) nanowires is verified to be valid by the good agreement with the improved loop test results.The direct MD method becomes an effective way to determine the elastic limit and the strength limit of nanoscale whiskers failed in brittle or ductile fracture at arbitrary loading rate. 展开更多
关键词 alumina nanowires bending behavior loading rate elastic limit strength limit molecular dynamics
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Growth of alumina oxide nanowires in an aluminum anodization process 被引量:4
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作者 ZHU KaiGui CHENG JingRan +3 位作者 CHANG MingChao WANG Wu WEI WenBo GE GuangLu 《Chinese Science Bulletin》 SCIE EI CAS 2011年第18期1947-1950,共4页
Alumina oxide nanowires were grown via a two-step anodization of aluminum foil. A growth mechanism is proposed for these nanowires which is different from that of those formed using chemical etching methods. An electr... Alumina oxide nanowires were grown via a two-step anodization of aluminum foil. A growth mechanism is proposed for these nanowires which is different from that of those formed using chemical etching methods. An electric field and stress are necessary to grow these nanowires, and the nano-imprinted metal surface of the aluminum foil has an important role. 展开更多
关键词 氧化铝纳米线 氧化过程 生长 铝阳极 阳极氧化 化学蚀刻 金属表面 铝箔
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Removal of trace Cr(VI) from water using chitosan-iron nanowires in porous anodic alumina 被引量:1
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作者 Li Sun Zhigang Yuan +6 位作者 Wenbang Gong Zili Xu Jijun Lu Qinghua Zou Yuqin Wu Gongbing Su Huafang Wang 《Science China Chemistry》 SCIE EI CAS CSCD 2016年第4期383-386,共4页
Chitosan-iron nanowires in porous anodic alumina (PAA) have been successfully prepared under ambient conditions as an ad- sorbent. The adsorbent was characterized by scanning electron microscopy, X-ray photoelectron... Chitosan-iron nanowires in porous anodic alumina (PAA) have been successfully prepared under ambient conditions as an ad- sorbent. The adsorbent was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and N2-BET surface area. The results showed that PAA can disperse and protect Fe0 nanorods from oxidation. The adsorption characteris- tics of trace Cr(VI) onto adsorbent have been examined at different initial Cr(VI) concentrations with pH 5. Batch adsorption studies show that the removal percentage of adsorbent for the removal of trace Cr(VI) is strongly dependent on the initial Cr(VI) concentrations. Langmuir and Freundlich isotherm models were used to analyze the experiment data. The adsorption of trace Cr(VI) by adsorbent is well modeled by the Langmuir isotherm and the maximum adsorption capacity of Cr(VI) is calcu- lated as 123.95 mg/g which is very closed to the experiment results. Intraparticle diffusion study shows that the intraparticle diffusion of adsorbent is not the sole rate-controlling step. The negative value of Gibbs free energy change,△G0, indicated that the process of Cr(VI) onto adsorbent was spontaneous. This work has demonstrated that chitosan-iron nanowires in porous anodic alumina as an adsorbent has promising potential for heavy metal removal at trace level. 展开更多
关键词 chitosan-iron nanowires isotherms Cr(VI) THERMODYNAMICS adsorption kinetics
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Magnetic nanowires fabricated by anodic aluminum oxide template—a brief review 被引量:3
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作者 LI WuXia ZHANG Jun +2 位作者 SHEN TieHan JONES Grenville A GRUNDY Philip J 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第7期1181-1189,共9页
Anodic aluminum oxide (AAO) with highly ordered nanoscale pores which are monodisperse and mutually parallel can be produced through a self-organized electrochemical process. Subsequent deposition of materials into ... Anodic aluminum oxide (AAO) with highly ordered nanoscale pores which are monodisperse and mutually parallel can be produced through a self-organized electrochemical process. Subsequent deposition of materials into the nanopores produces AA0 embedded nanowire arrays. Whilst the templates can be further removed to obtain free individual nanowires, the em- bedded nanowires form an interesting nanocomposite structure. Recent research activities on the fabrication and characteriza- tion of AAO template based magnetic nanowires are reviewed in this article. Studies of specific systems are given as an exam- ple of the research in the area. 展开更多
关键词 anodic aluminum oxides electrochemical deposition magnetic nanowires templates magneto-optical properties
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