Micelle Formation in Concentrated Sulfuric Acid as Solvent

Steigman, Joseph; Shane, Norman

doi:10.1021/j100887a047

Cited by 27 publications

(16 citation statements)

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“…This result is consistent with the CMC of a similar 12 carbon chain fatty acid in 82 wt% H 2 SO 4 of < 2 mM. 13 The presence of a salt such as Rhodamine 6G has been shown to lower the critical micelle concentration for surfactants as measured by other methods.…”

Section: Determination Of Critical Micelle Concentrationsupporting

confidence: 80%

“…The use of inorganic acids such as H 2 SO 4 dramatically increases the SBSL intensity, 2,700 times brighter than water. 13,52 Another significant difference between H 2 SO 4 SBSL and water SBSL is that the bubble is not stationary in H 2 SO 4 ( Figure 1.13 a). However, recent work using dual frequencies has shown another four-fold increase over the initial improvement, yielding over 10,000 times brighter than water SBSL.…”

Section: Sbsl In H 2 Somentioning

confidence: 99%

“…bremsstrahlung and ion-electron recombination) and blackbody radiation, which will produce featureless, continuum spectra. 2,13,16,19,38 Under certain circumstances, excited atoms and molecules can also emit light during the SBSL flash.…”

Section: Single-bubble Sonoluminescencementioning

confidence: 99%

“…40 The lack of emission lines combined with the short pulse time and continuum reaching into the UV raises speculation that the temperatures inside the bubble are very high. 13 Recently theoretical timeresolved spectra were calculated for xenon bubbles in water. 41 The calculated time-resolved reveal a peak from OH radical very early in the SBSL flash, but the OH emission line is quickly overwhelmed by the continuum (Figure 1.9).…”

Section: Sbsl In H 2 Omentioning

confidence: 99%

“…[11][12][13][14] Temperature determinations are based either on blackbody emission or on atomic and molecular emission (Figure 1.3). 13,15 Sonoluminescence was first discovered in 1933 by Marinesco and Trillat who noted that photographic plates immersed in water fogged when irradiated by ultrasound.…”

mentioning

confidence: 99%

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Single Bubble Sonoluminescence

2004

Sonoluminescence

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Section: Determination Of Critical Micelle Concentrationsupporting

confidence: 80%

Section: Sbsl In H 2 Somentioning

confidence: 99%

Section: Single-bubble Sonoluminescencementioning

confidence: 99%

Section: Sbsl In H 2 Omentioning

confidence: 99%

mentioning

confidence: 99%

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Single Bubble Sonoluminescence

2004

Sonoluminescence

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Solution properties and structure of brain proteolipids

Zand

1968

Biopolymers

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SynopsisBovine white matter proteolipids have been studied by several physical methods and have been found to exist as micelles in 2: 1 (v/v) chloroform-methanol solution. The data would indicate the existence of a critical micelle concentration at 0.017-0.022 g/100 ml. The curve appears linear in the range 0.017-0.2 g/100 ml, but from the data at higher concentrations it would appear that a change in slope is occurring in the region 0.2-0.3 g/100 ml. Light-scattering measurements on 2: 1 (v/v) chloroformmethanol solutions containing more than 0.2 g/100 ml of proteolipid yielded a weightaverage aggregate weight of 2.9 X 108 and a radius of gyration of 645 A. The intrinsic viscosity of the solutions was 0.32 dl/g and the Huggins constant was 1.085. Lightscattering measurements in 88.5% formic acid-0.5M sodium formate yielded a weightaverage aggregate weight of 7.1 X 106 and a radius of gyration of 241 A. The intrinsic viscosity observed for this solvent system is 0.14 dl/g and the Huggins constant is 1.005. Osmotic pressure measurements in 2 : 1 (v/v) chloroform-methanol containing less than 0.2 g/100 ml of proteolipid yielded a number-average aggregate weight of 7.2 X lo4Ultracentrifugal analysis in 1.5: 1 (v/v) methylene chloridemethanol showed two broad peaks with s values of s~.~% = 25.05 S, s2% = 19.79 S for the minor peak and s1.5%.2% = 1.86 S for the major peak. Optical rotatory dispersion studies revealed large changes in bo with change in solvent and proteolipid concentration. The present data suggest that the mode of attachment of protein to lipid is primarily of a noncovalent type. The results of this investigation also suggest that the proteolipid micelle above 0.2 g/lW ml is cylindrical (prolate ellipsoid) in 2: 1 (v/v) chloroform-methanol and approaches a more spherical shape in 88.5% formic acid. A structure for the proteolipid micellar complex above concentrations of 0.2 g/100 ml is proposed.

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Amphiphile Aggregation in konzentrierten Säuren Grenzflächenaktivität von N‐(n‐Alkyl)‐pyridinium‐Salzen in Schwefelsäure

Müller

Miethchen

1988

J. Prakt. Chem.

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Amphiphilic Aggregation in Concentrated Acids. Interfacial Activity from N‐(n‐Alkyl)‐Pyridinium Salts in Sulfuric Acid The critical micelle concentration of N‐(n‐alkyl)‐pyridinium salts in sulfuric acid of different concentrations was determined by measurements of their surface tension and interfacial tension changes. The concentration of surface saturation Γmax and surface area per molecule F were calculated from the slope of decreasing parts of surface tension lines VS log c. The influence of counter ion and anorganic additives was studied.

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Micelle Formation in Concentrated Sulfuric Acid as Solvent

Cited by 27 publications

References 1 publication

Single Bubble Sonoluminescence

Single Bubble Sonoluminescence

Solution properties and structure of brain proteolipids

Amphiphile Aggregation in konzentrierten Säuren Grenzflächenaktivität von N‐(n‐Alkyl)‐pyridinium‐Salzen in Schwefelsäure

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