Role of the porous structure of the hemosorbent in the sorption of large molecules

1987 ◽  
Vol 21 (2) ◽  
pp. 149-152
Author(s):  
N. M. Kaznacheeva ◽  
S. I. Surinova ◽  
S. P. Valueva ◽  
B. S. �l'tsefon ◽  
G. S. Golovina
Keyword(s):  
Porous Structure ◽  
Large Molecules

Fabrication of poly (1, 8-octanediol-co-Pluronic F127 citrate)/chitin nanofibril/bioactive glass (POFC/ChiNF/BG) porous scaffold via directional-freeze-casting

2020 ◽  
Vol 40 (7) ◽  
pp. 591-599
Author(s):  
Yaling Tian ◽  
Kai Liang ◽  
Yali Ji
Keyword(s):  
Bioactive Glass ◽  
Porous Structure ◽  
Pore Structure ◽  
Porous Scaffold ◽  
Pluronic F127 ◽  
Porous Scaffolds ◽  
Freeze Casting ◽  
Promising Candidate ◽  
Complete Replacement

AbstractThe citrate-based thermoset elastomer is a promising candidate for bone scaffold material, but the harsh curing condition made it difficult to fabricate porous structure. Recently, poly (1, 8-octanediol-co-Pluronic F127 citrate) (POFC) porous scaffold was creatively fabricated by chitin nanofibrils (ChiNFs) supported emulsion-freeze-casting. Thanks to the supporting role of ChiNFs, the lamellar pore structure formed by directional freeze-drying was maintained during the subsequent thermocuring. Herein, bioactive glass (BG) was introduced into the POFC porous scaffolds to improve bioactivity. It was found the complete replacement of ChiNF particles with BG particles could not form a stable porous structure; however, existing at least 15 wt% ChiNF could ensure the formation of lamellar pore, and the interlamellar distance increased with BG ratios. Thus, the BG granules did not contribute to the formation of pore structure like ChiNFs, however, they surely endowed the scaffolds with enhanced mechanical properties, improved osteogenesis bioactivity, better cytocompatibility as well as quick degradation rate. Reasonably adjusting BG ratios could balance the requirements of porous structure and bioactivity.

Study of the Water-Glass Role in the Foam Glass Synthesis Using Glycerol Foaming Agent

2021 ◽  
Vol 316 ◽  
pp. 153-158
Author(s):  
Boris M. Goltsman ◽  
Lyubov A. Yatsenko ◽  
Natalia S. Goltsman
Keyword(s):  
Porous Structure ◽  
Structure Formation ◽  
Water Glass ◽  
Glass Batch ◽  
Foam Glass ◽  
Foaming Agent ◽  
Additive Type ◽  
Highly Porous ◽  
Material Porosity

The article discusses the peculiarities of the "water-glass – glycerol" foaming mixture components interaction during foam glass synthesis. The important role of the foaming additive type in the foam glass porous structure formation was described, the main foaming substances were listed. The obtaining and researching technology of the samples was described, the compositions of the initial batches using the "water-glass – glycerol" mixture were developed. It was shown that a material with a highly porous structure and density below 500 kg/m3 can be obtained only with the combined introduction of water-glass and glycerol. In this case, mixtures with a predominance of water-glass in the foaming mixture possess optimal properties. Using DSC, it was shown that the addition of water-glass to the mixture completely eliminates the evaporation of glycerol at lower temperatures and intensifies its combustion at higher temperatures. Thus, the addition of water-glass to the glycerol-based foam glass batch allows glycerol to be saved up to higher temperatures that increases the resulting material porosity.

scholarly journals Surface interaction of WO3 nanocrystals with NH3. Role of the exposed crystal surfaces and porous structure in enhancing the electrical response

RSC Advances ◽  
2014 ◽  
Vol 4 (22) ◽  
pp. 11012 ◽  
Author(s):  
Massimiliano D'Arienzo ◽  
Lidia Armelao ◽  
Claudio Maria Mari ◽  
Stefano Polizzi ◽  
Riccardo Ruffo ◽  
...  
Keyword(s):  
Porous Structure ◽  
Electrical Response ◽  
Surface Interaction ◽  
Crystal Surfaces

Processes of the Foaming Mixture’ Components Interaction during the Foam Glass Synthesis

2020 ◽  
Vol 992 ◽  
pp. 271-276
Author(s):  
B.M. Goltsman ◽  
L.A. Yatsenko ◽  
Elena A. Yatsenko
Keyword(s):  
Porous Structure ◽  
Internal Structure ◽  
Foam Glass ◽  
Combustion Process ◽  
Structure And Properties ◽  
Stabilizing Agent

The prospects for the use of foam glass in construction were described. The modern compositions of foaming mixtures for foam glass synthesis were considered. Compositions for studying the influence of the foaming mixture components on the formation of foam glass porous structure were developed, their internal structure and properties were studied. The role of each component of the mixture on its foaming was revealed. Glycerol is a pore-forming agent, which decomposes and produces foaming gases. Waterglass is a stabilizing agent reducing glycerol combustion process. Recommendations on the application of the described patterns in the foam glass synthesis were given.

Antibonding σ* orbitals in molecular spectroscopy

1985 ◽  
Vol 63 (7) ◽  
pp. 2032-2043 ◽  
Author(s):  
M. B. Robin
Keyword(s):  
Ground State ◽  
Molecular Spectroscopy ◽  
Atomic Spectroscopy ◽  
High Symmetry ◽  
Giant Resonances ◽  
Molecular Absorption ◽  
Large Molecules ◽  
The Past ◽  
Bond Strengths

This paper discusses the role of σ* antibonding valence MO's in the electronic spectra of large molecules. Using the term value and antishielding concepts, molecular absorption patterns terminating at σ* MO's are systematized and rationalized; the frequencies of such excitations correlate with the ground-state bond strengths of the bonds giving rise to the σ* MO's. In unsaturated systems, the π → σ* and np → σ* excitations can be distinguished on the basis of their term values. Confusion in the past regarding the existence of excitations to σ* relates to the fact that σ* MO's often can be totally mixed into the surrounding sea of Rydberg levels of the same symmetry, and for all practical purposes can cease to exist except as perturbations on the Rydberg levels. For nonpenetrating Rydberg manifolds there is little or no mixing with σ* MO's of the same symmetry, setting the stage for the appearance of valence-shell excitations to σ* in high-symmetry molecules which are analogous to the d → f inner-well giant resonances of atomic spectroscopy.

The role of porous structure copolymers as catalytic systems carriers

Polimery ◽  
2003 ◽  
Vol 48 (07/08) ◽  
pp. 490-498 ◽  
Author(s):  
BOZENA KOLARZ ◽  
IZABELA OWSIK
Keyword(s):  
Porous Structure ◽  
Catalytic Systems

Do voltammetry electrodes modified with MIPs really work? The role of large molecules: folic acid as a probe

2014 ◽  
Vol 6 (17) ◽  
pp. 6658-6667 ◽  
Author(s):  
Abigail Vasconcelos Pereira ◽  
Priscila Cervini ◽  
Éder Tadeu Gomes Cavalheiro
Keyword(s):  
Folic Acid ◽  
Molecularly Imprinted Polymers ◽  
Molecularly Imprinted ◽  
Imprinted Polymers ◽  
Large Molecules

There are many uncertainties concerning the use of molecularly imprinted polymers (MIPs) as electrode modifiers.

scholarly journals VULNERABLE ELECTRICALLY CHARGED SARS-COV-2 POINTS, ELECTRIC MODEL OF THE VIRUS AND ROLE OF TRACE ELEMENTS IN ITS INACTIVATION

2021 ◽  
Vol 22 (1) ◽  
pp. 3-20
Author(s):  
V.G. Kaplunenko ◽  
◽  
N.V. Kosinov ◽  
A.V. Skalny ◽  
◽  
...  
Keyword(s):  
Trace Elements ◽  
Antiviral Agents ◽  
Review Article ◽  
Oxidation States ◽  
Special Role ◽  
Electrical Model ◽  
Large Molecules ◽  
Electrically Charged ◽  
Selection Of

In the review article, electrically charged molecular groups on the surface of the virus were considered as targets for antiviral agents. The prospects of trace element application in a low oxidation state as antiviral agents have been shown. An electrical model of SARS-CoV-2 has been developed in the form of a multilayer structure, where each shell corresponds to electrically charged proteins on the surface of the virus. The model reveals the role of Coulomb forces in adsorption and fusion processes and makes it possible to identify vulnerabilities in the coronavirus that are sensitive to electrically charged substances and to an electric field. The mechanism of antiviral action of trace elements is disclosed, based on the suppression of electrostatic interaction of virus with the cell by neutralizing the charges on the surface of the virus and the cell. This allows the selection of oligopeptides and trace elements in low oxidation states to suppress the adsorption capacity of viruses. The special role of trace elements is that many potential targets that are inaccessible to antibodies and other large molecules are easily available to trace elements.

scholarly journals PHYSICO-CHEMICAL CHARACTERISTICS AND SORPTION CAPACITY OF BIOSYNTHETIC POLYMERS ON THE BASIS OF FERULIC ACID AND CONIFERYL ALCOHOL RESPECT TO ZEARALENONE MYCOTOXIN

2018 ◽  
pp. 5-14
Author(s):  
Anatoliy Petrovich Karmanov ◽  
Al'bert Vladimirovich Kanarskiy ◽  
Zosya Albertovna Kanarskaya ◽  
Lyudmila Sergeyevna Kocheva ◽  
Ol'ga Yur'yevna Derkacheva ◽  
...  
Keyword(s):  
Ferulic Acid ◽  
Porous Structure ◽  
Chemical Structure ◽  
Coniferyl Alcohol ◽  
Element Composition ◽  
Identical Element ◽  
Quantitative Content ◽  
Physico Chemical ◽  
Physical Phenomena

The data about the chemical structure of the polymers, synthesized by the method of fermentative dehydropolymerization of ferulic acid, and also coniferyl alcohol, are presented. It is established that the polyferulic acids have practically identical element composition, but they differ, according to data of IR- and NMR-13C-spectroscopy, in the quantitative content of phenol and carboxyl groups. A study of their adsorptivity with respect to zearalenone mycotoxin is carried out, and the characteristics of specific surface area and capillary-porous structure are established. The calculations of the correlation relationships between the adsorptivity and the parameters of surface-porous structure and chemical structure of different models indicate to the key role of the mechanisms of chemical adsorption, whereas the contribution of physical phenomena is not essential. It is shown that the polymer, synthesized from the coniferyl alcohol, is characterized by the highest indices of adsorption.

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