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01000naa a22002652 4500 |
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NLM149574584 |
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DE-627 |
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20231223052020.0 |
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tu |
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231223s2004 xx ||||| 00| ||eng c |
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|a pubmed24n0499.xml
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|a (DE-627)NLM149574584
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|a (NLM)15274562
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Undabeytia, Tomas
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Clay-vesicle interactions
|b fluorescence measurements and structural implications for slow release formulations of herbicides
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| 264 |
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|c 2004
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| 336 |
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|a Text
|b txt
|2 rdacontent
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| 337 |
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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| 338 |
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|a Band
|b nc
|2 rdacarrier
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| 500 |
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|a Date Completed 22.05.2006
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|a Date Revised 30.11.2018
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|a published: Print
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|a Citation Status MEDLINE
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|a Clay-vesicle systems exhibit a potential for environmental applications, such as herbicide formulations for reduced leaching. Clay-vesicle interactions were addressed by combining adsorption and XRD measurements with fluorescence studies for didodecyldimethylammonium bromide (DDAB), dioctadecyldimethylammonium bromide (DDOB), and montmorillonite. XRD and adsorption data indicated that the adsorbing vesicles were transformed after 3 days into paraffinic and bilayer structures. Fluorescence studies revealed that adsorption was almost complete within 5 min for a loading below the cation exchange capacity (CEC). Aggregation and sedimentation of clay-surfactant particles occurred within several minutes. Fluorescent measurements of supernatants indicated decomposition of vesicles at a high clay/surfactant ratio due to rapidly adsorbing cationic monomers. The kinetics of energy transfer between vesicles labeled by NBD-PE (1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine-N-(7-nitro-2-1,3-benzoxadiazol-4-yl)) and montmorillonite labeled by rhodamine-B follows that of aggregation of surfactant-clay particles and structural changes of the vesicles at times of minutes to hours. Experiments following the reduction of NBD fluorescence by addition of dithionite indicate faster permeabilization of DDOB than DDAB vesicles, which was confirmed by leakage experiments. The faster permeabilization of DDOB vesicles in the presence of clay was correlated with their inferior suitability for the preparation of clay-based formulations of anionic herbicides for slow release
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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7 |
|a Aluminum Silicates
|2 NLM
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|a Herbicides
|2 NLM
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| 650 |
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|a Micelles
|2 NLM
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| 650 |
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|a Quaternary Ammonium Compounds
|2 NLM
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| 650 |
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7 |
|a Bentonite
|2 NLM
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| 650 |
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7 |
|a 1302-78-9
|2 NLM
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| 650 |
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7 |
|a didodecyldimethylammonium
|2 NLM
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| 650 |
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7 |
|a 13146-86-6
|2 NLM
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| 650 |
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7 |
|a Dithionite
|2 NLM
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| 650 |
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7 |
|a 14844-07-6
|2 NLM
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| 650 |
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7 |
|a dimethyldioctadecylammonium
|2 NLM
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| 650 |
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7 |
|a 251IW5I21C
|2 NLM
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| 650 |
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|a Clay
|2 NLM
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| 650 |
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|a T1FAD4SS2M
|2 NLM
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| 700 |
1 |
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|a Nir, Shlomo
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Gomara, Maria Jose
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 20(2004), 16 vom: 03. Aug., Seite 6605-10
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
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|g volume:20
|g year:2004
|g number:16
|g day:03
|g month:08
|g pages:6605-10
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|a GBV_USEFLAG_A
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|a SYSFLAG_A
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|a GBV_NLM
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|a GBV_ILN_721
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|a AR
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|d 20
|j 2004
|e 16
|b 03
|c 08
|h 6605-10
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