Liquid crystals of long-chain dialkyl phosphate salts in nonpolar solvents

Fukasawa, Jun-ichi; Tsutsumi, Hisao

doi:10.1016/0021-9797(91)90437-d

Cited by 22 publications

(24 citation statements)

References 13 publications

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“…Previously, we studied the interactions between Ca 2z ions and alkyl phosphate ions 3 as well as between CaHAP and alkyl phosphates, 4±6 and indicated that a layered structure composed of alternating bimolecular layers of alkyl phosphates and a dicalcium phosphate dihydrate (DCPD)-like phase is formed. However, to our knowledge, no study has been reported on the interaction between Al 3z and alkyl phosphate ions except for the studies by Fukasawa and Tsutsumi, 7,8 Sanchez-Camazano and Sanchez-Martin 9 and our previous paper. 10 Fukasawa and Tsutsumi prepared a binary system of aluminium salts of dihexadecyl phosphate (C 16 DP-Al) and n-hexadecane and suggested the chemical composition of C 16 DP-Al to be [(C 16 H 33 O) 2 OPO] 3 Al.…”

Section: Introductionmentioning

confidence: 81%

“…10 Fukasawa and Tsutsumi prepared a binary system of aluminium salts of dihexadecyl phosphate (C 16 DP-Al) and n-hexadecane and suggested the chemical composition of C 16 DP-Al to be [(C 16 H 33 O) 2 OPO] 3 Al. 7,8 Sanchez-Camazano and Sanchez-Martin treated kaolinite with trimethyl phosphate in hot water and found that the silicate structure of kaolinite is completely destroyed and that aluminium alkyl phosphate [Al(CH 3 ) 6 (PO 4 ) 3 ] is formed. 9 Nevertheless, the structure and mechanism of formation of these materials have not been fully explored.…”

Section: Introductionmentioning

confidence: 99%

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Formation and structure of aluminium alkyl phosphates

Tanaka¹,

Chikazawa²

1999

J. Mater. Chem.

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Aluminium alkyl phosphates (AlAPs) synthesized by the reaction of Al(NO 3 ) 3 ?9H 2 O with monohexyl, monooctyl or monodecyl phosphates in aqueous media have been characterized by various means. The XRD patterns of the AlAPs showed one strong and two weak diffraction peaks at 2hv15³. The plate-like AlAP particles prepared using octyl phosphate gave rise to lattice patterns having uniform alternating spacings of ca. 1.1 and 1.5 nm. When treated at 1000 ³C, AlAP samples were converted into tridymite AlPO 4 . The Al/P molar ratios of AlAP samples approximated to unity and their chemical formula can be written as (ROPO 3 )Al(OH)?1.2H 2 O. These facts suggest that the AlAPs are composed of alternating bimolecular layers of alkyl phosphates and a hydrated aluminium phosphate phase.

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Section: Introductionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Formation and structure of aluminium alkyl phosphates

Tanaka¹,

Chikazawa²

1999

J. Mater. Chem.

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“…On the other hand, a large number of low-molecular weight organic substances, such as metal soaps (1-9), 12-hydroxystearic acid (12HSA) (10)(11)(12)(13)(14), dibenzyliden sorbitol (15), long~hain dialkyl phosphates (16), amino acid derivatives (17)(18)(19)(20)(21) and steroid derivatives (22)(23)(24), are also known to form network structures in various organic media. On the other hand, a large number of low-molecular weight organic substances, such as metal soaps (1-9), 12-hydroxystearic acid (12HSA) (10)(11)(12)(13)(14), dibenzyliden sorbitol (15), long~hain dialkyl phosphates (16), amino acid derivatives (17)(18)(19)(20)(21) and steroid derivatives (22)(23)(24), are also known to form network structures in various organic media.…”

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confidence: 99%

“…In recent years, studies of the physicochemical behavior of organic polymer gels in aqueous media have progressively develope~ As a consequenc~ relationships between network structures and the mechanical properties of the gels have been revealed for aqueous systems of many polyelectrolytes, polysaccharides and proteins. On the other hand, a large number of low-molecular weight organic substances, such as metal soaps (1-9), 12-hydroxystearic acid (12HSA) (10)(11)(12)(13)(14), dibenzyliden sorbitol (15), long~hain dialkyl phosphates (16), amino acid derivatives (17)(18)(19)(20)(21) and steroid derivatives (22)(23)(24), are also known to form network structures in various organic media. From a practical viewpoint, these substances are widely utilized as regulators for viscoelastic prop erties of greases and cosmetics, a solidifier for spent edible oils, and reagents for the recovery of ocean-spilled oil (18,19).…”

mentioning

confidence: 99%

Effect of alkali metal ions on gel formation in the 12‐hydroxystearic acid/soybean oil system

Tamura

Suetake

Ohkubo

et al. 1994

J Americ Oil Chem Soc

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It has been known that 12-hydroxystearic acid (12HSA) forms a thermoreversible gel with a fibrous associated network in organic solvents. Mechanically durable gels were induced by the addition of small amounts of alkali metal ions, which can be supplied in the form of alkali metal salts of 12HSA (abbreviated as 12HS-M), even at a lower concentration range of gelling agent than with 12HSA alone. The structure of the networks was investigated by infrared spectrometry (IR), circular dichroism (CD) and scanning electron microscopy (SEM). The experiments were carried out over a total concentration range of 0.1 = 4.0 wt/vol% of 12HSA and 12HS-M in soybean oil. 12HS-Na showed more effective gel forming power than any other alkali metal ions. The molar ratio of 12HSA/12H~Na for obtaining optimal gel forming effect was 100:1. The intensity of the absorption bands of the IR spectra, due to the hydrogen-bonded hydroxyl groups, remained constant regardless of the amount of added 12HS-Na. A remarkable molar ellipticity decrease was observed with an increase in the concentration of 12HS-Na, although the maximum wavelength of the CD spectrum, originating from the chirality of 12HSA, remained constant. By SEM observation, linearly extended fibrils were observed with the addition of 12HS-Na. These results suggest that the mechanical strengthening of the gel by alkali metal ions is due to alteration of the dispersed state of the helically grown fibrous crystals of 12HSA.

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“…Friberg (1965Friberg ( , 1966 proposed existence of non-aqueous lamellar micellar structure (liquid crystals) in systems containing aluminium soaps in hydrocarbons. In addition, Fukasawa and Tsutsumi (1990) also described semisolid formulations showing presence of liquid crystals formed from long-chain dialkyl phosphate salt of aluminium in non-polar (n-hexadecane) system. Scric et al (1985Scric et al ( , 1988 also described presence of micellar structures in the oily systems containing liquid paraffin and magnesium stearate.…”

Section: Discussionmentioning

confidence: 96%