Role of surface silanol groups in the flocculation of silica suspensions by polyacrylamide. Part 2.—Surface changes of silica suspensions on ageing

1965 ◽  
Vol 61 (0) ◽  
pp. 1032-1038 ◽  
Author(s):  
O. Griot ◽  
J. A. Kitchener
Keyword(s):  
Silanol Groups ◽  
Silica Suspensions ◽  
Surface Changes

Role of Land-Surface Changes in Arctic Summer Warming

Science ◽  
2005 ◽  
Vol 310 (5748) ◽  
pp. 657-660 ◽  
Author(s):  
F. S. Chapin
Keyword(s):  
Land Surface ◽  
Summer Warming ◽  
Arctic Summer ◽  
Surface Changes

The Role of Cell Surface Changes in RNA Tumor Virus-transformed Cells

1974 ◽  
Vol 39 (0) ◽  
pp. 1181-1185 ◽  
Author(s):  
H. Bauer ◽  
R. Kurth ◽  
L. Rohrschneider ◽  
G. Pauli ◽  
R. R. Friis ◽  
...  
Keyword(s):  
Cell Surface ◽  
Transformed Cells ◽  
Tumor Virus ◽  
Cell Surface Changes ◽  
Surface Changes

Role of silanol groups in dispersing Mo(VI) on silica

1992 ◽  
Vol 16 (1-2) ◽  
pp. 71-76 ◽  
Author(s):  
R. D. Roark ◽  
S. D. Kohler ◽  
J. G. Ekerdt
Keyword(s):  
Silanol Groups

scholarly journals The Effect of Extrinsic Factors on the Mechanical Behavior and Structure of Elastic Dental Ligatures and Chains

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 38
Author(s):  
Kata Csekő ◽  
Péter Maróti ◽  
Zsuzsanna Helyes ◽  
Roland Told ◽  
Fanni Riegler ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Tensile Strength ◽  
External Factors ◽  
Extrinsic Factors ◽  
Force Decay ◽  
Plaque Control ◽  
Lower Tensile Strength ◽  
Scanning Electron ◽  
Surface Changes

Force provided by elastomers used in orthodontics can be affected by several factors present in the oral cavity. The aim of our study was to investigate the role of mouthwashes, toothbrushing, and smoking in the force decay of such elastomers. Tensile strength, changes in the force continuously exerted, and force decay of elastic chains (Ortho Organizer and Masel Short Power Chain) and elastic ligatures (Dentaurum and Masel) by two separate manufacturers were measured. Measurements were initially made on untreated elastics, followed by exposure to different environmental factors including cigarette smoke, toothbrushing (mechanical plaque control), and two different mouthwashes (chemical plaque control). Changes on the surface of the elastics were studied with scanning electron microscopy (SEM). Untreated Masel elastic ligature showed lower tensile strength than Dentaurum elastic ligature (2339 cN vs. 3660 cN), while significantly higher tensile strength was measured for Ortho Organizer elastic chains than Masel chains (2639 cN vs. 1324 cN). The decrease in the elastic force of Masel ligature was greater in response to all external factors compared to Dentaurum. Although brushing with toothpaste and toothbrush impacted the force of both Masel and Ortho organizer ligatures negatively, force degradation was more apparent in the case of the Ortho organizer. Surface changes were more visible when applying Curasept mouthrinse, however force decay was higher in the Corsodyl group. Mechanical and chemical plaque control can influence the tensile strength and force decay of orthodontic elastomers, which should be considered by selecting the elastomers or determining their changing interval for the practice.

scholarly journals A role of free silanol groups of nanosilica surface in interaction with poly(vinyl pyrrolidone)

2018 ◽  
Vol 72 (2) ◽  
pp. 51 ◽  
Author(s):  
Olga Voronina ◽  
Maria Malysheva ◽  
Liudmyla Nosach ◽  
Eugeny Voronin ◽  
Vladimir Gun’ko ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Crucial Role ◽  
Vinyl Pyrrolidone ◽  
Initial Amount ◽  
Silanol Groups ◽  
Adsorption Monolayer ◽  
Poly Vinyl Pyrrolidone

In this work, a role of the number of free silanol groups at a nanosilica surface (specific surface area S<sub>BET</sub> = 250 m<sup>2</sup>/g, initial amount of silanols α<sub>ОН</sub> = 0.60-0.62 mmol/g) was analyzed in interaction with poly(vinyl pyrrolidone) (PVP) vs. the degree (Q<sub>TMS</sub>) of silica hydrophobization by hexamethyldisilazane at 100 <sup>o</sup>C. The value of Q<sub>TMS</sub> was 0.07, 0.42, 0.67, 0.81, 0.82, and 1.0. Adsorption of PVP onto a nanosilica surface was carried out from a water and water-ethanol (1:1) solutions of the polymer. It was shown that free silanol groups play a crucial role in the adsorption of poly(vinyl pyrrolidone). The value of the maximal adsorption (monolayer capacity) on completely hydrophobic nanosilica surface is approximately by 6.5 times lower than that for unmodified nanosilica

On the Role of Tumor Cell Surface in the Accumulation of Radioisotopes

1976 ◽  
Vol 15 (05) ◽  
pp. 242-245 ◽  
Author(s):  
R. Dermietzel ◽  
M. Heidbreder ◽  
L. J. Anghileri
Keyword(s):  
Cell Surface ◽  
Tumor Cell ◽  
Cell Membrane Permeability ◽  
Ascites Tumor ◽  
Cell Coat ◽  
Structural Modifications ◽  
Permeability Changes ◽  
Cell Surface Changes ◽  
Surface Changes

SummaryThe effects of electrical charge and structural modifications of the ascites tumor cell surface on the uptake of several radiocompounds have been investigated. Changes in its electrical surface charge provoke variations in the radioactivity incorporation which appear to be selective for chelated or ionic radioisotopes. The release of a part of the cell “coat” by EDTA affects profoundly the incorporation of radioisotopes in a process which seems to be related to cell membrane permeability changes. The relationships between cell surface changes and radiocompounds accumulation are discussed.

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