Distribution and Characteristics of Nanotubular Halloysites in the Thach Khoan Area, Phu Tho, Vietnam
Two types of halloysite collected from the upper (UPS) and lower (LOS) zones of a weathered pegmatite profile in the Thach Khoan area, Phu Tho were defined by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy...
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doaj-20ab1e6b3378418881c4a352472b4e7c2020-11-25T00:34:55ZengMDPI AGMinerals2075-163X2018-07-018729010.3390/min8070290min8070290Distribution and Characteristics of Nanotubular Halloysites in the Thach Khoan Area, Phu Tho, VietnamBui Hoang Bac0Nguyen Tien Dung1Luong Quang Khang2Khuong The Hung3Nguyen Van Lam4Do Manh An5Phan Viet Son6Tran Thi Van Anh7Doan Van Chuong8Bui Thanh Tinh9Faculty of Geosciences and Geoengineering, Hanoi University of Mining and Geology, Hanoi 100000, VietnamFaculty of Geosciences and Geoengineering, Hanoi University of Mining and Geology, Hanoi 100000, VietnamFaculty of Geosciences and Geoengineering, Hanoi University of Mining and Geology, Hanoi 100000, VietnamFaculty of Geosciences and Geoengineering, Hanoi University of Mining and Geology, Hanoi 100000, VietnamFaculty of Geosciences and Geoengineering, Hanoi University of Mining and Geology, Hanoi 100000, VietnamFaculty of Geosciences and Geoengineering, Hanoi University of Mining and Geology, Hanoi 100000, VietnamFaculty of Geosciences and Geoengineering, Hanoi University of Mining and Geology, Hanoi 100000, VietnamFaculty of Geosciences and Geoengineering, Hanoi University of Mining and Geology, Hanoi 100000, VietnamBeca Joint Stock Company, 25 Nguyen Khanh Toan, Cau Giay Street, Hanoi 100000, VietnamFaculty of Geosciences and Geoengineering, Hanoi University of Mining and Geology, Hanoi 100000, VietnamTwo types of halloysite collected from the upper (UPS) and lower (LOS) zones of a weathered pegmatite profile in the Thach Khoan area, Phu Tho were defined by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), thermal analysis (TG and DTG), and N2 adsorption-desorption isotherms. XRD analysis showed that halloysite and kaolinite coexist in samples of size fractions <2 µm. Semi-quantitative analysis by XRD after formamide (FA) treatment indicated that the halloysite contents are approximately 81% and 93% in UPS and LOS samples, respectively. The results of SEM and TEM analyses showed that while short halloysite type is mainly distributed in the upper zone, long halloysite type occurs primarily in the lower zone of the weathered pegmatite profile. The length of short halloysite ranging from 250 to 750 nm is most popular, accounting for 47.2% of halloysites in the UPS sample. Meanwhile, long halloysites which have the length of 750–1250 nm are dominant in the LOS sample with 69.9%. In addition, short halloysites with outer diameter of >100 nm constitute 79.1% of halloysites in the UPS sample while long halloysites with outer diameter of 50–100 nm make up 74.2% of halloysites in LOS sample. Specific surface areas are 15.7434 and 22.0211 m2/g and average pore sizes are 18.9837 and 17.0281 nm for the UPS and LOS samples, respectively. The analysis implies that although forming under same natural geographical and climatic conditions, halloysites at different depths in the weathered pegmatite profile may have different morphological and other properties.http://www.mdpi.com/2075-163X/8/7/290halloysitekaolinitenanotubepegmatitePhu Tho |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Bui Hoang Bac Nguyen Tien Dung Luong Quang Khang Khuong The Hung Nguyen Van Lam Do Manh An Phan Viet Son Tran Thi Van Anh Doan Van Chuong Bui Thanh Tinh |
spellingShingle |
Bui Hoang Bac Nguyen Tien Dung Luong Quang Khang Khuong The Hung Nguyen Van Lam Do Manh An Phan Viet Son Tran Thi Van Anh Doan Van Chuong Bui Thanh Tinh Distribution and Characteristics of Nanotubular Halloysites in the Thach Khoan Area, Phu Tho, Vietnam Minerals halloysite kaolinite nanotube pegmatite Phu Tho |
author_facet |
Bui Hoang Bac Nguyen Tien Dung Luong Quang Khang Khuong The Hung Nguyen Van Lam Do Manh An Phan Viet Son Tran Thi Van Anh Doan Van Chuong Bui Thanh Tinh |
author_sort |
Bui Hoang Bac |
title |
Distribution and Characteristics of Nanotubular Halloysites in the Thach Khoan Area, Phu Tho, Vietnam |
title_short |
Distribution and Characteristics of Nanotubular Halloysites in the Thach Khoan Area, Phu Tho, Vietnam |
title_full |
Distribution and Characteristics of Nanotubular Halloysites in the Thach Khoan Area, Phu Tho, Vietnam |
title_fullStr |
Distribution and Characteristics of Nanotubular Halloysites in the Thach Khoan Area, Phu Tho, Vietnam |
title_full_unstemmed |
Distribution and Characteristics of Nanotubular Halloysites in the Thach Khoan Area, Phu Tho, Vietnam |
title_sort |
distribution and characteristics of nanotubular halloysites in the thach khoan area, phu tho, vietnam |
publisher |
MDPI AG |
series |
Minerals |
issn |
2075-163X |
publishDate |
2018-07-01 |
description |
Two types of halloysite collected from the upper (UPS) and lower (LOS) zones of a weathered pegmatite profile in the Thach Khoan area, Phu Tho were defined by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), thermal analysis (TG and DTG), and N2 adsorption-desorption isotherms. XRD analysis showed that halloysite and kaolinite coexist in samples of size fractions <2 µm. Semi-quantitative analysis by XRD after formamide (FA) treatment indicated that the halloysite contents are approximately 81% and 93% in UPS and LOS samples, respectively. The results of SEM and TEM analyses showed that while short halloysite type is mainly distributed in the upper zone, long halloysite type occurs primarily in the lower zone of the weathered pegmatite profile. The length of short halloysite ranging from 250 to 750 nm is most popular, accounting for 47.2% of halloysites in the UPS sample. Meanwhile, long halloysites which have the length of 750–1250 nm are dominant in the LOS sample with 69.9%. In addition, short halloysites with outer diameter of >100 nm constitute 79.1% of halloysites in the UPS sample while long halloysites with outer diameter of 50–100 nm make up 74.2% of halloysites in LOS sample. Specific surface areas are 15.7434 and 22.0211 m2/g and average pore sizes are 18.9837 and 17.0281 nm for the UPS and LOS samples, respectively. The analysis implies that although forming under same natural geographical and climatic conditions, halloysites at different depths in the weathered pegmatite profile may have different morphological and other properties. |
topic |
halloysite kaolinite nanotube pegmatite Phu Tho |
url |
http://www.mdpi.com/2075-163X/8/7/290 |
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