Hydrophobic-hydrophilic composite membranes containing silicalite-1 and Al-beta zeolites are prepared on the outer surface of the porous alpha-alumina tube for the first time. The hydrophilic layer with aluminum serves as an active catalytic domain, whereas the hydrophobic layer containing silicalite-1 with medium pore-size is expected to assist in separating the reaction products based on their hydrophobicity as well as shape-selectivity. The continuous defect-free composite membranes are fabricated by two-step synthesis approach by initial deposition of Al-beta crystals on the outer surface of porous alumina tube followed by coating of silicalite-1 crystals over the Al-beta layer in the second step under hydrothermal conditions. The composite membranes exhibited a high thermal stability of up to 550 degrees C. The powder X-ray diffraction patterns of samples collected at the bottom of crystallization vessel as well as coated membranes indicated typical BEA and MFI structures consisting of ca. 0.5-0.7 nm size micropores, and free from impurity phase. The field emission scanning electron microscopic (FE SEM) analysis of the silicalite-1 sample exhibited uniform rectangular crystals of size about 20 microm; whereas Al-beta showed spherical morphology with crystal size of approximately 0.6-0.7 microm. The surface and cross-sectional analyses of composite membranes both before and after calcinations exhibited defect-free microstructures for the composite membranes. The calcined membranes exhibited single gas permeation and the observed values for composite membranes are an order of magnitude lower than that of the individual membranes.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1166/jnn.2014.8565 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Fibrous membranes of poly(ethylene oxide)/Sesbania gum oxide/ε-poly(lysine): An influence on its structure.
Food Chem
January 2025
College of Food Science and Engineering, Hainan University, Haikou 570228, China.
Hydrogen peroxide (HO) was used to modify a natural polymer, sesbania gum (SG), to prepare oxidized sesbania gum (OSG) with the aim of investigating the physicochemical properties, antimicrobial activity of polyethylene oxide (PEO), OSG, and ε-poly(lysine) (ε-PL) composite fibre membranes and their applications in fresh-cut mango preservation. The PEO/OSG/ε-PL composite fibre membranes were successfully prepared via solution blow spinning (SBS) technology. The results of a series of characterizations revealed that ε-PL was successfully loaded into the fibrous membranes, exhibited good biocompatibility, and ε-PL was better encapsulated, with the membranes.
View Article and Find Full Text PDFDetecting changes of testicular interstitial cell membranes with a fluorescent probe after incubation and cryopreservation with cryoprotective agents.
Cryobiology
January 2025
The National Technical University "Kharkiv Polytechnic Institute", 2 Kyrpychova st, 61000 Kharkiv, Ukraine; Research Institute of Experimental and Clinical Medicine, Kharkiv National Medical University, 6 Trinklera st, 61022 Kharkiv, Ukraine. Electronic address:
Membrane alterations are among central factors predetermining cell survival during cryopreservation. In the present research, we tested some serum-/xeno-free cryoprotective compositions including dimethyl sulfoxide (MeSO) and polymers for their osmotic impact and toxicity towards testicular interstitial cells (ICs). IC survival was determined after their contact with MeSO, dextran (D40), hydroxyethyl starch (HES), polyethylene glycols (PEG1500 and PEG400), or after cryopreservation and cryoprotective agent (CPA) removal.
View Article and Find Full Text PDFLignin alkali regulated interfacial polymerization towards ultra-selective and highly permeable nanofiltration membrane.
Nat Commun
January 2025
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, China.
Thin-film composite polyamide (TFC PA) membranes hold promise for energy-efficient liquid separation, but achieving high permeance and precise separation membrane via a facile approach that is compatible with present manufacturing line remains a great challenge. Herein, we demonstrate the use of lignin alkali (LA) derived from waste of paper pulp as an aqueous phase additive to regulate interfacial polymerization (IP) process for achieving high performance nanofiltration (NF) membrane. Various characterizations and molecular dynamics simulations revealed that LA can promote the diffusion and partition of aqueous phase monomer piperazine (PIP) molecules into organic phase and their uniform dispersion on substrate, accelerating the IP reaction and promoting greater interfacial instabilities, thus endowing formation of TFC NF membrane with an ultrathin, highly cross-linked, and crumpled PA layer.
View Article and Find Full Text PDFSynaptoneurolipidomics: lipidomics in the study of synaptic function.
Trends Biochem Sci
January 2025
Research Group Neuroplasticity, Leibniz Institute for Neurobiology, Magdeburg, Germany; Leibniz Group 'Dendritic Organelles and Synaptic Function', Center for Molecular Neurobiology, ZMNH, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Center for Behavioral Brain Sciences, Otto von Guericke University, Magdeburg, Germany; German Center for Neurodegenerative Diseases (DZNE), Magdeburg, Germany. Electronic address:
The brain is an exceptionally lipid-rich organ with a very complex lipid composition. Lipids are central in several neuronal processes, including membrane formation and fusion, myelin packing, and lipid-mediated signal transmission. Lipid diversity is associated with the evolution of higher cognitive abilities in primates, is affected by neuronal activity, and is instrumental for synaptic plasticity, illustrating that lipids are not static components of synaptic membranes.
View Article and Find Full Text PDFSpatial expression of fibroblast activation protein-α in clear cell renal cell carcinomas revealed by multiplex immunoprofiling analysis of the tumor microenvironment.
Cancer Immunol Immunother
January 2025
Biobizkaia Health Research Institute, 48903, Barakaldo, Spain.
Clear cell renal cell carcinoma (ccRCC) is one of the most challenging neoplasms because of its phenotypic variability and intratumoral heterogeneity. Because of its variability, ccRCC is a good test bench for the application of new technological approaches to unveiling its intricacies. Multiplex immunofluorescence (mIF) is an emerging method that enables the simultaneous and detailed assessment of tumor and stromal cell subpopulations in a single tissue section.
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!