We study the sponge phase of the mixed non-ionic/ionic surfactant system C14DMAO-TTAB-hexanol-brine. Our aim is to determine if this phase exists in this mixed system and if it preserves or changes its structure when the relative amount of the charged surfactant is increased in the mixture. SAXS, FFEM, and conductivity results show that for the same bilayer volume fraction the sponge phase preserves its global structure. We propose a method to determine the geometrical obstruction factor from electrical conductivity measurements in ionic sponge phases. Analysis of lamellar phases in the same system shows that the bilayer thickness increases when the ionic surfactant concentration is increased.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jcis.2007.01.012 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Forward‒ and Retro‒Vapofluorochromism of Sponge‒Like Macrocycle Crystals.
Angew Chem Int Ed Engl
January 2025
Nanjing University, School of Chemistry and Chemical Engineering, No. 165, Xianlin Road, 210023, Nanjing, CHINA.
Achieving dynamic multicolor emission through solid-state molecular motion is of significant importance for advancing applications in organic solid-state luminescent materials. Herein, we report macrocycle crystals with unique forward‒ and retro‒vapofluorochromic behavior, which is realized by reversible amine vapor uptake and amine‒"squeeze" induced guest release. The forward‒vapofluorochromism occurs when aliphatic amines penetrate guest-free macrocycle crystals to form host‒guest complex crystals.
View Article and Find Full Text PDFDiscovery and configurations assignment of Ile/Leu-containing cyclic peptides with cytotoxic activity, reniochpeptins A-D, from the marine sponge Reniochalina sp.
Phytochemistry
January 2025
Research Center for Marine Drugs, Clinical Pharmacy College, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China. Electronic address:
Four previously undescribed cyclic peptides, reniochpeptins A-D (1-4), were isolated from the marine sponge Reniochalina sp. Their structures were elucidated through comprehensive spectroscopic analyses and a modified advanced Marfey's method. This method utilized ultra-high-performance liquid chromatography coupled with tandem multiple reaction monitoring mass spectrometry, employing a CORTECS T column to achieve simultaneous separation of derivatized -Leu, -Ile, -allo-Ile, -Leu, -Ile, and -allo-Ile within 25 minutes in a single analytical run.
View Article and Find Full Text PDFCarbon nanotubes stabilized in chitosan sponge (CNT-CS) as a new alternative clean-up sorbent for pesticide multiresidue determination in eggplants using QuEChERS and UHPLC-MS/MS.
Anal Bioanal Chem
January 2025
Laboratory of Pesticide Residues Analysis (LARP), Chemistry Department, Federal University of Santa Maria (UFSM), Santa Maria, RS, 97105-900, Brazil.
The continuous development and application of pesticides in agriculture require robust multiresidue detection methods to guarantee food safety. This study introduces a novel method for multiresidue determination of pesticides in eggplants using the QuEChERS procedure, incorporating a clean-up step using carbon nanotubes stabilized in chitosan sponge (CNT-CS) and ultra-high performance liquid chromatography with tandem mass spectrometry (UHPLC-MS/MS) for analysis. Upon identifying the optimal extraction conditions, various sorbents were assessed for their efficacy in the dispersive solid-phase extraction (d-SPE).
View Article and Find Full Text PDFChanges in microbiome composition during ontogeny and dispersal of the coral boring sponge Thoosa mismalolli.
Sci Rep
January 2025
Laboratorio de Bioinformática Microbiana, Programa Académico de Ingeniería en Biotecnología, Universidad Politécnica de Sinaloa, Carretera Municipal Libre Km. 3 Mazatlán-Higueras, 82199, Mazatlán, Sinaloa, Mexico.
Dispersal is an important life history trait that plays a key role in the demography and evolution of species. We employed a combined approach of DNA sequencing and transmission electron microscopy to examine the changes in the microbiome during the ontogeny and dispersal of the coral-excavating sponge Thoosa mismalolli. The results show that sponge can acquired their associated bacteria via both vertical (VT) and horizontal transmission (HT).
View Article and Find Full Text PDFA self-hygroscopic, rapidly self-gelling polysaccharide-based sponge with robust wet adhesion for non-compressible hemorrhage control and infected wounds healing.
Bioact Mater
April 2025
Department of Orthopedic Surgery, First People's Hospital of Foshan, Foshan, Guangdong, 528000, PR China.
Uncontrollable non-compressible hemorrhage and traumatic infection have been major causes of mortality and disability in both civilian and military populations. A dressing designed for point-of-care control of non-compressible hemorrhage and prevention of traumatic infections represents an urgent medical need. Here, a novel self-gelling sponge OHN@ε-pL is developed, integrating N-succinimidyl ester oxidized hyaluronic acid (OHN) and ε-poly-L-lysine (ε-pL).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!