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HDTMA

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Journal Article
Published: 01 February 2000
Clays and Clay Minerals (2000) 48 (1): 43–50.
...Guangyao Sheng; Stephen A. Boyd Abstract Sorptive properties of organoclays may be greatly influenced by the physicochemical properties of organic sorbates. Hexadecyltrimethylammonium(HDTMA) clays were prepared using a high-charge smectite (HDTMA-SAz-1), a low-charge smectite (HDTMA-SWy-2...
FIGURES | View All (5)
Journal Article
Journal: Clay Minerals
Published: 01 March 2015
Clay Minerals (2015) 50 (1): 103–115.
...Barbara Szala; Tomasz Bajda; Anna Jeleń Abstract The removal of Cr(VI) from aqueous solutions under various conditions was investigated using a natural clinoptilolite and a synthetic zeolite derived from fly-ash (Na-P1), modified either with hexadecyltrimethylammonium bromide (HDTMA...
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Journal Article
Published: 01 April 2013
Clays and Clay Minerals (2013) 61 (2): 98–106.
... (HDTMA + ). The third was a weak interaction involving the ion pair HDTMA + Br − . The results of this study may be useful for the comprehensive design of organoclays with specific physicochemical properties according to the application for which they are destined. * E-mail address of corresponding...
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Journal Article
Published: 01 April 2007
Clays and Clay Minerals (2007) 55 (2): 131–139.
...Phil G. Slade; Will P. Gates Abstract X-ray diffraction shows that ordered interlayer structures form when high-charged Llano vermiculite is reacted with HDTMA-Br or HDTMA-acetate, but the structures differ from those given by low-charged vermiculites. The differences arise in two ways; firstly...
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Journal Article
Published: 01 December 2006
Clays and Clay Minerals (2006) 54 (6): 689–696.
... it mainly involved only partitioning. This study demonstrates that the distribution of adsorbed surfactant and the arrangement of adsorbed HDTMA + within the clay interlayer space control the efficiency and mechanism of sorption by the organoclay rather than BET-N 2 surface area, pore volume, and pore...
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Journal Article
Published: 01 April 2004
Clays and Clay Minerals (2004) 52 (2): 204–210.
...Phil G. Slade; Will P. Gates Abstract X-ray basal reflections of several HDTMA-vermiculites show that when these contain co-adsorbed molecules of HDTMA-Br, their interlayer spacings are ~29.5 Å After HDTMA-Br has been leached out with ethanol, spacings decrease to ~26 Å, but when exposed...
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Journal Article
Published: 01 August 2002
Clays and Clay Minerals (2002) 50 (4): 435–445.
...Seung Yeop Lee; Soo Jin Kim Abstract The adsorption of hexadecyltrimethylammonium (HDTMA) in smectite was studied by adsorption isotherms, X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Smectites that had reacted for 48 h with HDTMA cations equivalent to 0.2...
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Journal Article
Published: 01 February 1997
Clays and Clay Minerals (1997) 45 (1): 42–53.
... to elucidate patterns of hexadecyltrimethylammonium bromide (HDTMA) sorption on the treated surface and to understand the mechanisms of this sorption. TMAFM images were obtained to a scale of 50 nm by 50 nm. The images of unmodified clinoptilolite showed a framework pattern on the ac plane, comparable...
Journal Article
Journal: Clay Minerals
Published: 01 March 2012
Clay Minerals (2012) 47 (1): 31–44.
...G. A. Ikhtiyarova; A. S. Özcan; Ö. Gök; A. Özcan Abstract In this study, natural bentonite was modified with hexadecyltrimethylammonium (HDTMA) bromide to obtain organobentonite (HDTMA-bentonite). Bentonite and HDTMA-bentonite were then characterized using XRD, XRF, SEM, FT-IR, thermogravimetric...
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Journal Article
Journal: Clay Minerals
Published: 01 June 2003
Clay Minerals (2003) 38 (2): 225–232.
...S. Y. LEE; S. J. KIM Abstract The dehydration of hexadecyltrimethylammonium (HDTMA)-exchanged smectites has been studied using X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). The basal spacing of hydrated HDTMA-smectites changed with temperature. The 2.5 HDTMA-smectite (i.e...
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Journal Article
Journal: Clay Minerals
Published: 21 January 2021
Clay Minerals (2020) 55 (4): 342–350.
... and then with organic complexes such as hexadecyltrimethylammonium bromide (HDTMA) and phenyltrimethylammonium chloride (PTMA). Changes in the surface properties and morphology of the montmorillonite before and after the modification with various concentrations of organic complexes were investigated using X-ray...
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Journal Article
Published: 01 January 2009
American Mineralogist (2009) 94 (1): 143–150.
...Xiandong Liu; Xiancai Lu; Rucheng Wang; Huiqun Zhou; Shijin Xu Abstract Classical molecular dynamic simulations are performed to investigate the microscopic properties of hexadecyltrimethylammonium (HDTMA) intercalated smectites with and without the cointercalation of acetate groups. Three model...
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Journal Article
Published: 01 August 2006
Clays and Clay Minerals (2006) 54 (4): 426–434.
... and naphthalene from water by a smectite clay (SWy-2) saturated with ammonium, tetramethylammonium (TMA), trimethylphenylammonium (TMPA) and hexadecyltrimethylammonium (HDTMA). In all cases, we observed greater sorption of 2,4-dinitrotoluene compared with 1,3-dinitrobenzene. The sorption isotherms for 2,4...
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Journal Article
Published: 01 June 2009
Clays and Clay Minerals (2009) 57 (3): 392–403.
... is a relatively new phenomenon. The purpose of this study was to use NIR spectroscopy to investigate the effect of alkylammonium cations on the acid dissolution of a high-charge montmorillonite (SAz-1). Detailed analysis of the spectra of Li + -, TMA + - (tetramethylammonium), and HDTMA...
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Journal Article
Published: 01 August 2003
Clays and Clay Minerals (2003) 51 (4): 445–451.
... affinity for hexadecyltrimethylammonium (HDTMA), a cationic surfactant used for surface modification. The HDTMA sorption capacities were 520 and 260 mmol/kg for PFl-1 and SepSp-1, respectively. Accompanying HDTMA sorption, the sorption of counterion bromide reached 380, and 210 mmol/kg, for PFl-1 and SepSp...
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Journal Article
Published: 01 February 2002
Clays and Clay Minerals (2002) 50 (1): 11–17.
...James L. Bonczek; W. G. Harris; Peter Nkedi-Kizza Abstract A low-charge Na-montmorillonite (SWy-2) was exchanged with hexadecyltrimethyl-ammonium (HDTMA) at levels equal to 20, 40, 60, 70, 80, 90, 100, 150 and 200% of the cation exchange capacity (819 mmol(+)/kg) to determine the nature...
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Journal Article
Published: 01 February 1999
Clays and Clay Minerals (1999) 47 (1): 28–35.
...Michael A. Anderson; Frans R. Trouw; Cheok N. Tam Abstract Dynamical and thermodynamic properties of water at room temperature in Ca- and hexadecyltrimethylammonium- (HDTMA) exchanged bentonite were determined for 4 different water contents ( approximately 0.03-0.55 g water g (super -1) clay...
Image
Interlayer structure of dry <b>HDTMA</b>-Mnt (a) and water-saturated <b>HDTMA</b>-Mnt (b)...
Published: 01 June 2015
Figure 3 Interlayer structure of dry HDTMA-Mnt (a) and water-saturated HDTMA-Mnt (b). The structural models are drawn according to Zhao and Burns (2012a , 2013) , Zhu, R. et al. (2011a , 2011b ), and Zhou et al. (2014) . Both the side view (top) and the vertical view (bottom) are shown
Image
(a) Schematic drawing of the microstructure of <b>HDTMA</b>-Mnt and <b>HDTMA</b>&#x2F;CPAM-Mnt...
Published: 01 June 2015
Figure 13 (a) Schematic drawing of the microstructure of HDTMA-Mnt and HDTMA/CPAM-Mnt; (b) HDTMA/CPAM-Mnt showed better sorption capacity toward nitrobenzene than the corresponding HDTMA-Mnt. The loading level of organic cations: 0.6 times of the CEC for HDTMA and 2–6 wt.% for CPAM (image
Image
Different forms of surfactant adsorption: <b>HDTMA</b> +  (CE) (●), <b>HDTMA</b>  Total  ...
Published: 01 April 2013
Figure 9 Different forms of surfactant adsorption: HDTMA + (CE) (●), HDTMA Total (VdW ) (■), HDTMA + Br − (VdW) (▲), and HDTMA + (VdW) (◆): Amounts adsorbed per mass of clay in relation to the amount of surfactant added initially.