Viscometric and Turbidimetric Measurements of a Non-ionic Detergent 11G3 efficient with potassium bromide and a DVB 8 resin, and find that (Drsr) µ " is 1.
LiQ'ht-scatterin g a nd viscosity m easurem e nts were made on solu tions o f thr ee catio ni c d eterge~lt~ in di s tilled water and ill var ious solutions of sod iu m chlorid e. The d cterp;ents 'YC1'e dodeeyla mill e hydrochloride, dodecy lt l"lll1 l'th.v la Il1ll10 nlulll chlo l"ld e, a nd tctmdecyltr im ethvlanlmo lliul11 chl ori de. The fi r st of these \\'as investigated at 30° C a nd t he othe rs at 23° C. The mi cell ar we ig ht a nd t he in t rin sic viscosity of t he micelles of eaell detergent \\'ere calc ulated, a nd t he d epe nde nce of tiWSl' quantities on t he concentration o f sod ium c hl oride is d iscusspd .
The viscosities of solutions of sodium dodecyl s ulfate of concentratio ns up to 0.8 per ce nt in distilled water and in 0.01-to 0.12-iVI sodium chloride have been measmed . By int roducing t he concept of a m onomer saturation concentration i t is possible to determi ne t he intrinsic viscosity of the micelles at each concentratio n of sodium chloride. A method for t he experiment a l determination of the monomer saturation concent ration is prese nted. The dependence of t he intrinsic viscosity on the sal t concent rat ion is disc ussed in te rms of eJectrovi sco us a nd hy dration effects . The data indicate tile presence of spherical micelles in t he solu t ions investigated.
Introd u ctionSince th e early exp erimen ts of . K rafft [1]1 and McBain [2] on soap solu tions, and th e subscqucnt intcrpretaLjon of th ejr r es ults in terms of th e existence of micelles i n su ch solutions, m any r esearch es [3, 4] h ave b een under ta ken. to investigate th e size and shape of these particles . It is now generally assumed that th ere are at least two types of micelles .In th e concentration range b eL",veen th e onset of micelle formation (about 0.1 to 0.25 percent by weight) and a~out 1 to 2 p er cent! a s~all, highly charo·ed and hIghly conductll1g mlCelle I S though t t o e~ist. This typ e of micelle h as b een discussed at some len.gth by Hartley [5,6]. H e considered them as spher es, but th ere has been 1~0 general ~gree nient on th eir shape. A large mIcelle, havmg a structure discernible by X-ray diffraction, exists at high er concentrations (about 10 pOl·cen t 0:· gr eater). They h ave been diseussed and mvestigated by M cBain [2], H ess [7], Philippoff [8], and others [9]. Harkins [1 0] and his coworkers interpret th eir lat~r X-ray diffraction data for co ncentrated solutJOns III terms of cylindrical micelles. Brady [11], however, utilizing a treatment considered b y 90r1"1n [12], interprets hi~ da~a for concentrate~ sodlUm d
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