Surface hydration states of commercial high purity α-Al_2O_3 powders evaluated by temperature programmed desorption mass spectrometry and diffuse reflectance infrared Fourier transform spectroscopy

Takashi Shirai; Jin Wang Li; Koji Matsumaru; Chanel Ishizaki; Kozo Ishizaki

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Surface hydration states of commercial high purity α-Al_2O_3 powders evaluated by temperature programmed desorption mass spectrometry and diffuse reflectance infrared Fourier transform spectroscopy

机译：通过程序升温解吸质谱和漫反射红外傅里叶变换光谱法评估市售高纯度α-Al_2O_3粉末的表面水合状态

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摘要

The surface of three different grades of commercial high-purity α-Al_2O_3 powders produced by hydrolysis of aluminum alkoxide, which differ each other in SSA are evaluated by temperature programmed desorption mass spectrometry (TPDMS) and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. For the DRIFT evaluation the powders were heated in situ under vacuum from 25 to 700℃. The TPDMS spectra of desorbed H_2O were obtained by heating the samples under ultra high vacuum at a rate of 20 K min~(-1) up to 1200℃. The presence of hydrogen bonded water molecules, amorphous Al(OH)_3 and AlOOH structures, as well as associated and isolated hydroxyl groups on the surface of all the α-Al_2O_3 powders investigated is demonstrated. On the surface of one of the powders the presence of crystalline Al(OH)_3 structures, as evidenced by an additional sharp peak in the H_2O TPDMS spectrum, is confirmed.

机译：通过程序升温解吸质谱（TPDMS）和漫反射红外傅里叶变换（DRIFT）光谱对通过铝的醇盐水解制得的三种不同等级的商品高纯度α-Al_2O_3粉末的表面进行了评估。为了进行DRIFT评估，将粉末在真空下原位加热至25至700℃。将样品在超高真空下以20 K min〜（-1）加热至1200℃，得到H_2O的TPDMS光谱。证明存在氢键的水分子，无定形的Al（OH）_3和AlOOH结构以及所有被研究的α-Al_2O_3粉末表面上存在缔合和分离的羟基。证实在一种粉末的表面上存在结晶的Al（OH）_3结构，这是由H_2O TPDMS光谱中的另一个尖锐峰所证实的。

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《Science and Technology of Advanced Materials》 |2005年第2期|p.123-128|共6页
作者
Takashi Shirai; Jin Wang Li; Koji Matsumaru; Chanel Ishizaki; Kozo Ishizaki;
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作者单位

Nagaoka Gijutsu-Kagaku Daigaku, Nagaoka University of Technology, Niigata 940-2188, Japan;

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原文格式 PDF
正文语种 eng
中图分类工程材料学;
关键词
high purity Al_2O_3; surface; temperature programmed desorption mass spectrometry (TPDMS); diffuse reflectance infrared fourier transform (DRIFT); Al(OH)_3; AlOOH; hydroxyl;

机译：高纯Al_2O_3;表面;程序升温脱附质谱（TPDMS）;漫反射红外傅里叶变换（DRIFT）;Al（OH）_3;AlOOH;羟基;

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Surface hydration states of commercial high purity α-Al_2O_3 powders evaluated by temperature programmed desorption mass spectrometry and diffuse reflectance infrared Fourier transform spectroscopy

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