One-step process composite colloidal monolayers and further processing aiming at porous membranes.
Summary of "One-step process composite colloidal monolayers and further processing aiming at porous membranes."
Composite materials consisting of a monolayer of polystyrene spheres and porous silica, filling in the interstices, have been fabricated and characterized. The proposed growth method introduces some novelties as far as the fabrication of this kind of monolayers is concerned as it probes the compatibility of co-assembly (in which a silica precursor is added to the base colloid) with confined growth in a wedge-shaped cell, while profiting from the advantages of both techniques. Using this method, it is possible to fabricate the composite monolayer in a single growth step. A systematic study of the growth parameters was performed in order to improve the quality of the two dimensional crystals produced. The composites were then subjected to thermal treatment so that the polymer is removed to reveal the inverse structure. A comparison of reflectance spectra, between composite monolayers fabricated using this method and composites achieved infiltrating polystyrene bare opals with silica chemical vapor deposition, is also established. The procedure presented is expected to establish the route for an easier and quicker fabrication of inverse monolayers of high refractive index materials with application in light control.
Affiliation
Journal Details
This article was published in the following journal.
Name: Langmuir : the ACS journal of surfaces and colloids
ISSN: 1520-5827
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22866898
- DOI: http://dx.doi.org/10.1021/la302395x
Medical and Biotech [MESH] Definitions
Phosphoadenosine Phosphosulfate
3'-Phosphoadenosine-5'-phosphosulfate. Key intermediate in the formation by living cells of sulfate esters of phenols, alcohols, steroids, sulfated polysaccharides, and simple esters, such as choline sulfate. It is formed from sulfate ion and ATP in a two-step process. This compound also is an important step in the process of sulfur fixation in plants and microorganisms.
Electrophoresis
An electrochemical process in which macromolecules or colloidal particles with a net electric charge migrate in a solution under the influence of an electric current.
Antigen Presentation
The process by which antigen is presented to lymphocytes in a form they can recognize. This is performed by antigen presenting cells (APCs). Some antigens require processing before they can be recognized. Antigen processing consists of ingestion and partial digestion of the antigen by the APC, followed by presentation of fragments on the cell surface. (From Rosen et al., Dictionary of Immunology, 1989)
Dialysis
A process of selective diffusion through a membrane. It is usually used to separate low-molecular-weight solutes which diffuse through the membrane from the colloidal and high-molecular-weight solutes which do not. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Polyadenylation
The addition of a tail of polyadenylic acid (POLY A) to the 3' end of mRNA (RNA, MESSENGER). Polyadenylation involves recognizing the processing site signal, (AAUAAA), and cleaving of the mRNA to create a 3' OH terminal end to which poly A polymerase (POLYNUCLEOTIDE ADENYLYLTRANSFERASE) adds 60-200 adenylate residues. The 3' end processing of some messenger RNAs, such as histone mRNA, is carried out by a different process that does not include the addition of poly A as described here.
PubMed Articles
Effect of colloidal particle size on adsorbed monodisperse and bidisperse monolayers.
Coating hydrogel films or microspheres by an adsorbed colloidal shell is one synthesis method for forming colloidosomes. The colloidal shell allows control of the release rate of encapsulated material...
Self-assembled nanoparticle antiglare coatings.
Here we report a simple and scalable bottom-up technology for assembling close-packed nanoparticle monolayers on both sides of a glass substrate as high-quality antiglare coatings. Optical measurement...
Stability analysis of motion patterns in biathlon shooting.
The aim of this study was to analyze the stability of the aiming process of elite biathlon athletes. Nine elite athletes performed four series of five shots onto the same target and onto targets next...
Monolayers of PbSe and PbS quantum dots and PbSe/CdSe core/shell quantum dots made by Langmuir-Blodgett deposition are compared, with a focus on the formation, the morphology and the photoluminescence...
Mechanism of spontaneous formation of monolayers on gold from alkyl thiosulfates.
The kinetics of adsorption of self-assembled monolayers (SAMs) from solutions of hexadecyl thiosulfate in tetrahydrofuran was studied under a variety of experimental conditions to elucidate the mechan...
Clinical Trials
Safety and Efficacy Study of Panzem NCD to Treat Glioblastoma
This single-center, open-label, phase 2 study will evaluate the anti-tumor activity, as well as the safety and pharmacokinetics, of Panzem (2-methoxyestradiol, 2ME2) Nanocrystal Colloidal...
The purpose of this study is to evaluate the efficacy, limited pharmacokinetics (PK), and safety of 1,000 mg of Panzem® NCD administered orally four times a day to patients with recurrent...
The Effects of Increased Central Serotonergic Activity on Information Processing
It is of great clinical relevance to know if selective serotonin re-uptake inhibitors affect information processing. Our hypothesis was that aspects of information processing would be dist...
12-step Facilitation for the Dually Diagnosed
This is a randomized trial testing the efficacy of a modified 12-step facilitation therapy for individuals with serious mental illness and alcohol use disorders, compared to usual treatmen...
The purpose of this study was to determine which treatment strategy, the step-up or the step-down treatment strategy, is the most cost-effective treatment for patients with new onset dyspe...
