Bipolar surfactants sune surfactants waɗanda ke da ƙungiyoyin anionic da cationic hydrophilic.

A faɗaɗa magana, amphoteric surfactants sune mahadi waɗanda ke da kowane rukunin hydrophilic guda biyu a cikin kwaya ɗaya, gami da anionic, cationic, da ƙungiyoyin hydrophilic nonionic. Abubuwan da ake amfani da su na amphoteric da aka saba amfani da su sune mafi yawan kungiyoyin hydrophilic tare da ammonium ko quaternary ammonium salts a cikin cationic part da carboxylate, sulfonate, da phosphate iri a cikin anionic part. Misali, amino acid amphoteric surfactants tare da amino da ƙungiyoyi a cikin kwayoyin halitta iri ɗaya su ne betaine amphoteric surfactants da aka yi daga gishiri na ciki wanda ya ƙunshi duka ammonium quaternary da ƙungiyoyin carboxyl, tare da nau'ikan iri-iri.

Nunin amphiphilic surfactants ya bambanta da ƙimar pH na maganin su.

Nuna kaddarorin cationic surfactants a cikin kafofin watsa labarai na acidic; Nuna kaddarorin masu surfactants anionic a cikin kafofin watsa labarai na alkaline; Nuna kaddarorin masu surfactants marasa ionic a cikin kafofin watsa labarai na tsaka tsaki. Ma'anar inda cationic da anionic Properties suna daidaitattun daidaito ana kiransa wurin isoelectric.

A wurin isoelectric, nau'in amino acid nau'in amphoteric surfactants wani lokaci suna hazo, yayin da nau'in betaine surfactants ba sa saurin hazo ko da a wurin isoelectric.

nau'in BetaineAn fara rarraba surfactants a matsayin mahaɗin gishiri na ammonium quaternary, amma ba kamar gishirin ammonium na quaternary ba, ba su da anions.
Betaine yana kula da ingantaccen cajin kwayoyin sa da kaddarorin cationic a cikin kafofin watsa labarai na acidic da alkaline. Irin wannan surfactant ba zai iya samun tabbataccen caji ko mara kyau ba. Dangane da ƙimar pH na maganin ruwa na wannan nau'in fili, yana da kyau a rarraba shi azaman surfactant amphoteric ba daidai ba.

Bisa ga wannan gardama, nau'in nau'in betaine yakamata a rarraba su azaman cationic surfactants. Duk da waɗannan gardama, yawancin masu amfani da sinadarin betaine suna ci gaba da rarraba su a matsayin mahadin amphoteric. A cikin kewayon heteroelectricity, akwai tsarin biphasic a cikin aikin saman: R-N + (CH3) 2-CH2-COO -.

Mafi na kowa misali na betain surfactants ne alkylbetain, kuma samfurin wakilinsa shine N-dodecyl-N, N-dimethyl-N-carboxyl betaine [BS-12, Cl2H25-N + (CH3) 2-CH2COO -]. Betaine tare da ƙungiyoyin amide [Cl2H25 a cikin tsarin an maye gurbinsa da R-CONH - (CH2) 3-] yana da mafi kyawun aiki.

Ruwan taurin baya rinjayar dabetainsurfactant. Yana samar da kumfa mai kyau da kwanciyar hankali mai kyau a cikin ruwa mai laushi da ruwa. Bugu da ƙari, an haɗa shi tare da mahadi na anionic a ƙananan ƙimar pH, ana iya amfani dashi a hade tare da anionic da cationic surfactants. Ta hanyar haɗa betaine tare da anionic surfactants, za a iya cimma kyakkyawan danko.