Green Synthesis of Organophilic Clays; Solid-State Reaction of Acidic Clay with Organoamine

Hayakawa, T.; Minase, Makoto; Fujita, Ken‐ichi; Ogawa, Makoto

doi:10.1021/acs.iecr.5b03344

Cited by 14 publications

(6 citation statements)

References 47 publications

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“…Prior to the measurements, the samples were coated with platinum with a thickness of 10–12 nm. The interlayer cations were exchanged with NH 4 + ions using ammonium acetate to determine the cation-exchange capacity (CEC) according to previous studies. , The eluent was analyzed by atomic absorption (AA) spectroscopy (Shimadzu AA-7000 atomic absorption spectrometer) to determine the composition of the interlayer cation. After the ion exchange, the excess salt was removed by washing with DI water.…”

Section: Methodsmentioning

confidence: 99%

“…Then, the NH 4 + ion adsorbed on the purified bentonite was leached out by treatment with an aqueous solution of magnesium chloride. The amount of the released NH 4 + ions in the supernatant, which corresponds to the CEC, was determined using the Kjeldahl method. , Whiteness was evaluated by the Hunter method using a GM-26D gloss meter (Murakami Color Research Laboratory Co. Ltd.) using magnesium oxide as the standard . UV–visible absorption spectra were obtained using a UV–visible spectrometer (LAMDA 1050, PerkinElmer).…”

Section: Methodsmentioning

confidence: 99%

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Organophilic Clay with Useful Whiteness

Nag

Hayakawa²,

Minase³

et al. 2022

Langmuir

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An organophilic clay was obtained by the intercalation of dioctadecyldimethylammonium ions into the interlayer space of a purified bentonite. The organophilic clay was characterized by its excellent whiteness, which originated from the used purified bentonite with a low content of colored impurities, suitable for its practical application in paints, cosmetics, polymer additives, etc. The dioctadecyldimethylammonium− bentonite clay was applied as a support to accommodate polyaromatic molecules to afford luminescent hybrids with high luminescence efficiency, showing its usefulness as a component of photofunctional hybrid materials.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Organophilic Clay with Useful Whiteness

Nag

Hayakawa²,

Minase³

et al. 2022

Langmuir

Self Cite

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“…So-called solid-solid reactions, which occur between powders in the solid state, have attracted much attention not only because of their reaction kinetics but also because of their industrial applications [10][11][12]. In addition, solid-solid reactions can be used to prepare compounds that are not accessible from solutions [13].…”

Section: Introductionmentioning

confidence: 99%

Intercalation of Cocamide Diethanolamine into Swellable Clay by Solid-State Process

Han

Park

2022

Crystals

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Coconut fatty acid diethanolamine (cocamide-DEA (CDEA)), CH3(CH2)16CON(CH2CH2OH)2 was intercalated into montmorillonite using both solution and solid-state reaction methods. In a typical solution process, the CDEA aqueous solution was mixed with a montmorillonite (Kunipia-F) aqueous suspension, which resulted in a CDEA–montmorillonite layer complex with a basal spacing of 13.8 Å. A CDEA–montmorillonite complex was also easily prepared by the solid–solid reaction method. A mixture of CDEA and Na–montmorillonite was ground at ambient temperature. The basal spacing of the mixture increased to approximately 44 Å after grinding for 30 min. Upon washing, the basal spacing decreased to approximately 10 Å, which was close to that of pristine Na–montmorillonite owing to the deintercalation of the CDEA molecules. The basal spacing of the CDEA–montmorillonite composite starting from protonated montmorillonite decreased to 13.5 Å upon washing, indicating the parallel monolayer arrangement of CDEA molecules between the silicate layers. This finding strongly suggests that acid–base intralayer complexation is responsible for the solid-state intercalation reaction.

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“…However, due to the inorganic nature of bentonite, it is not compatible with organic media and, hence, requires being organo-modified [ 7 , 8 , 9 , 10 ]. Many different methods, including ion exchange [ 11 , 12 ], grafting of organic compounds [ 13 , 14 ], acid–base reactions [ 15 ], pillaring by different types of polycations [ 16 , 17 ], ion-dipole interaction [ 11 , 18 ], etc., were applied to modify the bentonite minerals. Among these, the conventional wet cation exchange technique has been commercialized and widely used for the synthesis of organo-montmorillonite (OMMT).…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Synthesis of Rosin-Modified Montmorillonite: A Breakthrough Approach to the Next Generation of OMMT/Rubber Nanocomposites

2021

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The current investigation presents a green mechanochemical procedure for the synthesis of a special kind of rubber-compatible organo-montmorillonite (OMMT) for use in the inner liner compound of tires. The compatibility character of the OMMT arises from the mechanochemical reaction of the raw bentonite mineral and gum rosin as some of the organic constituents of the inner liner composition. The monitoring of OMMT synthesis by various characterization techniques reveals that gum rosin gradually intercalates into the montmorillonite (MMT) galleries during milling and increases the interlayer spacing to 41.1 ± 0.5 Å. The findings confirm the simultaneous formation of single- or few-layered OMMT platelets with average sizes from the sub-micron range up to several micrometers during the milling process. The mechanical properties of the OMMT/rubber nanocomposite, such as tensile strength, tear resistance and elongation, present a good enhancement in comparison to the un-modified material. Moreover, the organo-modification of the inner liner composition also leads to a property improvement of about 50%.

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Green Synthesis of Organophilic Clays; Solid-State Reaction of Acidic Clay with Organoamine

Cited by 14 publications

References 47 publications

Organophilic Clay with Useful Whiteness

Organophilic Clay with Useful Whiteness

Intercalation of Cocamide Diethanolamine into Swellable Clay by Solid-State Process

Mechanochemical Synthesis of Rosin-Modified Montmorillonite: A Breakthrough Approach to the Next Generation of OMMT/Rubber Nanocomposites

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