Ndị surfactants bipolar bụ ndị nwere ma otu anionic na cationic hydrophilic.

N'ikwu ya n'ụzọ sara mbara, amphoteric surfactants bụ ihe mejupụtara nwere otu hydrophilic abụọ ọ bụla n'ime otu molekul ahụ, gụnyere otu anionic, cationic, na otu nonionic hydrophilic. Amphoteric surfactants a na-ejikarị eme ihe bụkarị otu hydrophilic nwere ammonium ma ọ bụ quaternary ammonium salts na akụkụ cationic na ụdị carboxylate, sulfonate, na phosphate na akụkụ anionic. Dịka ọmụmaatụ, amino acid amphoteric surfactants nwere amino na otu nkebi na otu molekul ahụ bụ betaine amphoteric surfactants nke e ji nnu dị n'ime mee nke nwere otu quaternary ammonium na otu carboxyl, yana ụdị dị iche iche.

Ngosipụta nke amphiphilic surfactants dịgasị iche dabere na uru pH nke ngwọta ha.

Igosipụta njirimara nke cationic surfactants na acidic media; Igosipụta njirimara nke anionic surfactants na alkaline media; Igosipụta njirimara nke non-ionic surfactants na media neutral media. Ebe a na-akpọ cationic na anionic ihe onwunwe zuru oke ka a na-akpọ isoelectric point.

N'ebe a na-akpọ isoelectric, ụdị amino acid amphoteric surfactants na-apụta mgbe ụfọdụ, ebe ụdị betaine anaghị apụta ngwa ngwa ọbụlagodi n'ebe a na-akpọ isoelectric.

Ụdị BetaineA na-ekepụta ihe ndị na-emepụta surfactants dị ka ihe ndị na-emepụta nnu ammonium nke quaternary, mana n'adịghị ka nnu ammonium nke quaternary, ha enweghị anion.
Betaine na-ejigide chajị molekul dị mma na ihe onwunwe cationic na acidic na alkaline media. Ụdị surfactant a enweghị ike ịnweta chajị positive ma ọ bụ negative. Dabere na uru pH nke mmiri mmiri nke ụdị ihe mejupụtara a, ọ bụ ihe ezi uche dị na ya ịkewa ya dị ka amphoteric surfactant na-ezighi ezi.

Dịka arụmụka a si dị, a ga-ekewa ụdị betaine dị ka cationic surfactants. N'agbanyeghị arụmụka ndị a, ọtụtụ ndị na-eji ngwakọta betaine na-aga n'ihu na-ekewa ha dị ka ihe ndị na-eme ka amphoteric sie ike. N'ime oke heteroelectricity, enwere usoro biphasic na ọrụ elu: R-N+(CH3) 2-CH2-COO -.

Ihe atụ kachasị ewu ewu nke surfactants ụdị betaine bụ alkyl.betaine, ihe nnọchi anya ya bụ N-dodecyl-N, N-dimethyl-N-carboxyl betaine [BS-12, Cl2H25-N+(CH3) 2-CH2COO -]. Betaine nwere otu amide [Cl2H25 nọ n'ụdị ahụ ka R-CONH - (CH2) 3-] ji arụ ọrụ ka mma.

Ike mmiri anaghị emetụta yabetaineihe na-eme ka mmiri dị nro. Ọ na-emepụta ụfụfụ dị mma ma kwụsie ike nke ọma n'ime mmiri dị nro ma nke siri ike. Na mgbakwunye na ngwakọta anionic na obere pH, enwere ike iji ya na njikọta anionic na cationic surfactants. Site na ijikọta betaine na anionic surfactants, enwere ike nweta viscosity zuru oke.