Synthesis and properties of di-n-hexadecyl-a,ω-alkyl bisphosphate surfactants / P. Tyagi in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 47, N° 4/2010 (07-08/2010)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 47, N° 4/2010 (07-08/2010) . - p. 232-237 Titre : Synthesis and properties of di-n-hexadecyl-a,ω-alkyl bisphosphate surfactants Type de document : texte imprimé Auteurs : P. Tyagi, Auteur ; R. Tyagi, Auteur Année de publication : 2010 Article en page(s) : p. 232-237 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Surfactants  'Hexadecyl  phosphate'  '1,4-dibromo  butane'  1,6-dibromo  hexane'  '1,8-dibromo  octane'  'Bis  phosphoric  acid' Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Amphipatic compounds with connecting group between two lipophilic groups were prepared by phosphorylating a long chain alcohol (hexadecanol) with pyrophosphoric acid to prepare hexadecyl phosphate. Then the resulting hexadecyl phosphate was used to prepare bisphosphate surfactants with terminal dibromo alkanes viz. 1,4-dibromo butane or 1,6-dibromo hexane or 1,8-dibromo octane using acetonitrile as solvent. The structure of synthesized products were verified by modern analytical techniques viz. FT-IR, and 1H-NMR. The disodium salts of bisphosphate surfactants were obtained by neutralization of free acid with sodium hydroxide. The performance properties viz. foaming, wetting, emulsifying ability and anionic content of synthesized surfactants were also evaluated. The synthesized bisphosphate surfactant with 1,6-dibromo hexane possessed maximum anionic content and showed good water solubility, foaming, wetting, and emulsifying ability compared to conventional analogs. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9802 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
012399	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Synthesis of bisphosphodiester surfactants derived from tetradecanol and different methylene chains as a spacer derived from a-ω-alkyl dibromides / P. Tyagi in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 4/2011 (07-08/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 4/2011 (07-08/2011) . - p. 293-300 Titre : Synthesis of bisphosphodiester surfactants derived from tetradecanol and different methylene chains as a spacer derived from a-ω-alkyl dibromides Type de document : texte imprimé Auteurs : P. Tyagi, Auteur ; R. Tyagi, Auteur Année de publication : 2011 Article en page(s) : p. 293-300 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bisphosphodiester Composés amphiphiles Dispersions et suspensions Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Bisphosphodiester surfactant is a name assigned to a family of synthetic amphiphiles possessing a hydrocarbon chain attached to another hydrocarbon chain via different methylene chains as a spacer derived from α-ω-alkyl dibromide (1,4-DBB, 1,6-DBH and 1,8-DBO). In the present study, a series of bisphosphodiester surfactants having C14 hydrophobic tail and different methylene chains as a spacer derived from α-ω-alkyl dibromide have been synthesized at 35 °C. The effect of reaction variables like temperature, duration and molar ratios of mono tetradecyl phosphate, tetramethyl ammonium hydroxide and spacer on the yield of bisphosphodiester surfactants has also been reported. Modern instrumental techniques viz. FT-IR, 1HNMR, and 13CNMR were utilized to characterize the functional groups presence in synthesized bisphosphodiester surfactants. Elemental analysis of synthesized bisphosphodiester surfactants was also carried out. Surface active properties viz. surface tension, interfacial tension, critical micelle concentration and aqueous properties viz. foaming stability, wetting ability, emulsifying ability and dispersing power of synthesized gemini surfactants were also determined. Among all synthesized bisphosphodiester surfactants IIIb had maximum anionic content of 78.9%; and showed highest foaming ability (70 ml), superior dispersing ability (45.7%), whereas IIIc showed low CMC values (0.00026 mmol/l); minimum surface tension and interfacial tension (37.3 mN/m and 31.6 mN/m) respectively. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11947 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
013232	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Synthesis, structural properties and applications of gemini surfactants : a review / P. Tyagi in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 46, N° 6/2009 (11-12/2009)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 6/2009 (11-12/2009) . - p. 373-382 Titre : Synthesis, structural properties and applications of gemini surfactants : a review Type de document : texte imprimé Auteurs : P. Tyagi, Auteur ; R. Tyagi, Auteur Année de publication : 2009 Article en page(s) : p. 373-382 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens Mouillage (chimie des surfaces) Mousse (chimie) Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Gemini surfactants are most exciting new types of surfactants. They have two hydrophilic head groups and two hydrophobic groups in a molecule separated by a spacer group. Nowadays different types of geminis have been synthesized. Geminis show some characteristic features like low cmc, high surface activity, high solubility in water, good foaming and wetting properties, as well as low Krafft temperature. Geminis imply low eye and skin irritation. These surfactants are widely used as antifoaming and antimicrobial agents. This review paper deals with synthesis, properties and applications of various gemini surfactants. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6813 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011757	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 3 / 3)