+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Interactions in mixed cationic surfactants and dextran sulfate aqueous solutions

, : Interactions in mixed cationic surfactants and dextran sulfate aqueous solutions. Journal of Colloid and Interface Science 285(1): 342-350

The interactions between a hydrophilic anionic polysaccharide, dextran sulfate, and oppositely charged surfactants, n-alkylammonium chlorides (the number of carbon atoms per chain being 10, 12, and 14), were investigated by optical microscopy, X-ray diffraction, microelectrophoretic mobility, conductivity, surface tension, and light-scattering measurements at 303 K. The increase of surfactant alkyl chain length shifts both the critical aggregation (cac) and the critical micelle concentrations (cmc) toward lower surfactant concentration. Light-scattering and microelectrophoretic data revealed the coexistence of differently structured complexes beyond the cac. The presence of giant vesicles indicates that at least one type of species is ordered in bilayers. X-ray analysis of dry n-alkylammonium dextran sulfates exhibited mesomorphous ordering and interplanar spacings typical for lamellar structures; i.e., n-alkylammonium molecules form more or less disordered bilayers interconnected with dextran sulfate chains, thus forming multilamellar stacks. The average basic lamellar thickness increased linearly with the increase of surfactant chain length, whereas the average number of lamellar bilayers in the stack of lamellae decreases.


PMID: 15797432

DOI: 10.1016/j.jcis.2004.11.063

Other references

Pathela, P.; Hajat, A.; Schillinger, J.; Blank, S.; Sell, R.; Mostashari, F., 2006: Discordance between sexual behavior and self-reported sexual identity: a population-based survey of New York City men. Background: Persons reporting sexual identity that is discordant with their sexual behavior may engage in riskier sexual behaviors than those with concordant identity and behavior. The former group could play an important role in the spread of se...

Singh, S.; Sardhana, M.; Sharma, S.; Chitralkar, P., 2014: Choriocarcinoma presenting as an isolated bone marrow metastasis-a case report. Gestational trophoblastic diseases (GTD) are a heterogenous group of disorders that arise from trophoblastic epithelium. They can follow molar pregnancy (50%), abortions (25%), normal pregnancy (22.5%), and ectopic pregnancy (2.5%) [Robert JK, Lor...

Anonymous, 1926: The direct influence of H-ion concentration in culture mediums upon plant cells. Soil Science 22(3): 217

Hobbs, S.K.; Shi, G.; Bednarski, M.D., 2003: Synthesis of polymerized thin films for immobilized ligand display in proteomic analysis. We describe a new material for the display of biomolecular ligands for use in proteomic analysis. We report here on the construction of the first functionalized polymerized diacetylene thin films (PDTFs) for use in displaying immobilized ligands a...

Liu, J.; Zhu, H.; Jiang, H.; Zhang, H.; Wu, D.; Hu, X.; Zhang, H., 2016: Tumor M2 pyruvate kinase in diagnosis of nonsmall cell lung cancer: A meta-analysis based on Chinese population. The purpose of this study was to evaluate the value of tumor M2 pyruvate kinase (tumor M2-PK) in the diagnosis of nonsmall cell lung cancer. The diagnosis clinical studies of tumor M2-PK in the diagnosis of nonsmall cell lung cancer were electroni...

Mosse, A., 1961: Therapeutic technics for realimentation of severely emaciated patients. La Revue du Praticien 11: 2655-2661

Menerath, J.M.; Rios, L.; Chiambaretta, F.; Cluzel, J.; Louis, V.; Doly, M., 1998: Electroretinographic and histologic assessment of laser-induced retinal venous occlusion in albino rats. IOVS 39(4): S994, March 15

Kahan, E.; Yaphe, J.; Knaani-Levinz, H.; Weingarten, M.A., 2004: Comparison of blood pressure measurements on the bare arm, below a rolled-up sleeve, or over a sleeve. This study examined the effect of measuring blood pressure below subjects' rolled-up sleeves, over the sleeve, or on the bare arm. This is an important day-to-day issue for the busy GP. The sample consisted of 201 subjects in family practice...

Hamdy, S.; Rothwell, J., C., 1998: Gut feelings about recovery after stroke: The organization and reorganization of human swallowing motor cortex. Swallowing problems can affect as many as one in three patients in the period immediately after a stroke. In some cases this can lead to serious morbidity, in particular malnutrition and pulmonary aspiration. Despite this, swallowing usually recov...

Mao, W.; Liu, Y.; Mody, A.; Montecchi-Palmer, M.; Wordinger, R.J.; Clark, A.F., 2013: Characterization of a spontaneously immortalized bovine trabecular meshwork cell line. Trabecular meshwork cells (TM) have widely been used as an in vitro model for glaucoma research. However, primary TM cells suffer the disadvantages of limited cell numbers and slow rates of proliferation. We discovered a spontaneously transformed...