Immobilization and nonspecific adsorption of proteins to pyrogeneous highly dispersed silicon dioxide

1987 ◽  
Vol 9 (8) ◽  
pp. 561-566 ◽  
Author(s):  
M. Fusek ◽  
M. Čapka ◽  
J. Turková
Keyword(s):  
Silicon Dioxide ◽  
Nonspecific Adsorption ◽  
Highly Dispersed

scholarly journals MECHANOCHEMICAL AND ULTRASONIC TREATMENT – A CONTROLLED METHOD FOR FORMING THE STRUCTURE AND PROPERTIES OF NANOCOMPOSITE GEL SYSTEMS

2021 ◽  
Vol 2 (446) ◽  
pp. 36-44
Author(s):  
А.О. Zhapekova ◽  
N.N. Mofa ◽  
B. Elouadi ◽  
R.S. Iminova ◽  
А.Е. Bakkara ◽  
...  
Keyword(s):  
Silicon Dioxide ◽  
Microcrystalline Cellulose ◽  
Ultrasonic Treatment ◽  
Homogeneous System ◽  
The State ◽  
Gelling Agent ◽  
Structure And Properties ◽  
Colloidal Systems ◽  
Silica Powder ◽  
Highly Dispersed

In this work, the preparation of colloidal systems with microcrystalline cellulose as a gelling agent and silica powder as a filler was considered. By mechanochemical and ultrasonic treatment of a filler made of silicon dioxide and a colloidal base, varying the constituent ingredients, one can purposefully influence the structure of the system and regulate the properties of the resulting compositions. It is shown that the introduction of a filler made of highly dispersed silicon dioxide into a gel system based on cellulose, modified by ultrasonic treatment (UST) with acid additives, provides both acceleration of the gelation process and stabilization of the state of the obtained colloidal composition. As a result of UST, a nanostructured colloidal homogeneous system is formed.

A Simple Nanocasting Route for Preparation of Mesoporous Titanium Dioxide/GCM Microsphere

2014 ◽  
Vol 521 ◽  
pp. 576-580
Author(s):  
Hai Bin Yang ◽  
Wei Rao
Keyword(s):  
Titanium Dioxide ◽  
Theoretical Analysis ◽  
Silicon Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Graphitic Carbon ◽  
Carbon Microspheres ◽  
Highly Dispersed ◽  
Nanocasting Route ◽  
Mesoporous Titanium Dioxide ◽  
Battery Material

Mesoporous titanium dioxide/graphitic carbon microspheres were synthesized by a simple nanocasting route using monodisperse silicon dioxide microspheres as the template. The characterize and the morphology of the titanium dioxide/graphitic carbon microspheres have been analyzed by means of XRD, N2-sorption, SEM, TEM, TG-DTA and EDAX. Indicated by the experimental results and the theoretical analysis, the anatase titanium dioxide nanoparticles of 8-14 nm in diameter were highly dispersed in the graphitic carbon microspheres. The obtained material can be used as catalyst or battery material. Key words: titanium dioxide/graphitic carbon; Microspheres; Nanocasting route;Mesoporous

Change in electrosurface properties of Methylomonas rubra cells at contact interaction with particles of silicon dioxide

1993 ◽  
Vol 39 (9) ◽  
pp. 902-905 ◽  
Author(s):  
A. S. Gordienko ◽  
I. V. Zbanatskaya ◽  
I. K. Kurdish
Keyword(s):  
Silicon Dioxide ◽  
Contact Interaction ◽  
Negative Charge ◽  
Highly Dispersed ◽  
Adsorption Processes

The addition of highly dispersed silicon dioxide to a suspension of Methylomonas rubra cells under defined conditions resulted in an increasing negative charge in the cells. This phenomenon is not explained in terms of the known conceptions of adsorption processes, in spite of the fact that it is probably a consequence of the contact interaction between cells and silicon dioxide particles.Key words: contact interaction, electrosurface property, silicon dioxide, Methylomonas rubra.

scholarly journals Research of the adsorption of aliphatic carboxylic acids on the surface of polysorb

2020 ◽  
Vol 64 (10) ◽  
pp. 63-67
Author(s):  
Alexander A. Kimyashov ◽  
◽  
Alexander V. Syromolotov ◽  
Maksim O. Pavlov ◽  
◽  
...  
Keyword(s):  
Silicon Dioxide ◽  
Carboxylic Acids ◽  
Targeted Delivery ◽  
Overweight People ◽  
Saturation Region ◽  
Highly Dispersed ◽  
Medicinal Substances ◽  
Pseudo Second Order ◽  
Aliphatic Carboxylic Acids ◽  
Kinetics Of

The enterosorbent "Polysorb" is a highly dispersed powder of silicon dioxide. In medicine, it is used as a detoxifier for poisoning with organic substances and heavy metals. Recently, the direction in pharmaceuticals related to targeted delivery of medicines has begun to develop. One of the carriers of medicinal substances is highly dispersed silicon dioxide. There are explorations that show that with simultaneous oral administration of highly dispersed silicon dioxide and the antibiotic amphotericin, the concentration of the latter in the blood increases significantly. Recently, there have been studies showing that delivering propionic acid to the gut reduces fat accumulation in overweight people. The goal of this work is study the adsorption of aliphatic carboxylic acids, namely: formic, acetic, propionic on the surface of polysorb. Using electron microscopy, it was shown that polysorb powder consists of particles of different sizes and shapes. Their size varies from units to tens of micrometers. Adsorption isotherms of formic, acetic, and propionic acids were constructed at a temperature of 295 K. It is shown that they have an S-shaped character, therefore, adsorption is due to the formation of hydrogen bonds between the silanol groups of the hydrated POLYSORB and the carboxyl groups of acids. It is established that these isotherms are adequately described by the Freundlich model up to the saturation region. With an increase in the hydrocarbon radical, the adsorption capacity of acids decreases. The kinetics of acid adsorption on the polysorb surface was described using pseudo-first and pseudo-second order models. It was found that the adsorption kinetics of carboxylic acids is adequately described by the pseudo-first-order model. The time of onset of adsorption equilibrium is 30 seconds at a temperature of 295 K.

Highly dispersed MnOx–FeOx supported by silicalite-1 for the selective catalytic reduction of NOx with NH3 at low temperatures

2020 ◽  
Vol 10 (16) ◽  
pp. 5525-5534 ◽  
Author(s):  
Jialiang Gu ◽  
Bingjun Zhu ◽  
Rudi Duan ◽  
Yan Chen ◽  
Shaoxin Wang ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Low Temperatures ◽  
Catalytic Reduction ◽  
Highly Dispersed ◽  
Reduction Of Nox

MnOx–FeOx-Loaded silicalite-1 catalysts exhibit high NOx conversion at low temperatures.

Interlayer confinement synthesis of Ir nanodots/dual carbon as an electrocatalyst for overall water splitting

2020 ◽  
Author(s):  
Yaru Li ◽  
Yu-Quan Zhu ◽  
Weili Xin ◽  
Song Hong ◽  
Xiaoying Zhao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Noble Metal ◽  
High Efficiency ◽  
Overall Water Splitting ◽  
Highly Dispersed

Rationally designing low-content and high-efficiency noble metal nanodots offers opportunities to enhance electrocatalytic performances for water splitting. However, the preparation of highly dispersed nanodots electrocatalysts remains a challenge. Herein, we...

Buckling Control of Silicon Dioxide Diaphragms for Sensitivity Enhancement of Piezoelectric Ultrasonic Microsensors

2011 ◽  
Vol 131 (7) ◽  
pp. 235-239 ◽  
Author(s):  
Kaoru Yamashita ◽  
Tomoya Yoshizaki ◽  
Minoru Noda ◽  
Masanori Okuyama
Keyword(s):  
Silicon Dioxide ◽  
Sensitivity Enhancement
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