Dielectric Relaxations in Aqueous Polyelectrolyte Solutions:  A Scaling Approach and the Role of the Solvent Quality Parameter

Langmuir ◽  
2002 ◽  
Vol 18 (16) ◽  
pp. 6404-6409 ◽  
Author(s):  
F. Bordi ◽  
C. Cametti ◽  
T. Gili ◽  
R. H. Colby
Keyword(s):  
Quality Parameter ◽  
Dielectric Relaxations ◽  
Solvent Quality ◽  
Polyelectrolyte Solutions

Role of (Bi1/2K1/2)TiO3 in the dielectric relaxations of BiFeO3-(Bi1/2K1/2)TiO3 ceramics

2016 ◽  
Vol 119 (15) ◽  
pp. 154101 ◽  
Author(s):  
Chae Il Cheon ◽  
Jin Hong Choi ◽  
Jeong Seog Kim ◽  
Jiadong Zang ◽  
Till Frömling ◽  
...  
Keyword(s):  
Dielectric Relaxations

scholarly journals Dissolution of cellulose using a combination of hydroxide bases in aqueous solution

Cellulose ◽  
2019 ◽  
Vol 27 (1) ◽  
pp. 101-112 ◽  
Author(s):  
Beatrice Swensson ◽  
Anette Larsson ◽  
Merima Hasani
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Microcrystalline Cellulose ◽  
Low Temperatures ◽  
Dynamic Rheology ◽  
Organic Base ◽  
Single Base ◽  
Solvent Quality ◽  
Solvent Stability

Abstract In order to further understand the role of the cation when dissolving cellulose in aqueous solutions of hydroxide bases, different bases were combined in solution. Up to 5 wt.% of microcrystalline cellulose was dissolved using a combination of NaOH and the organic base tetramethylammonium hydroxide (TMAH) in water at low temperatures. Thermoscans of solutions containing both NaOH(aq) and TMAH(aq) indicated that cellulose interaction with TMAH seems to be favoured over NaOH. Dynamic rheology measurements of the solutions revealed that combining the two bases delayed gelation significantly when compared to cellulose dissolved in NaOH(aq) or TMAH(aq) alone. Intrinsic viscosity of cellulose in the combined NaOH- and TMAH(aq) solutions was slightly higher than that of the single-base solutions, indicating a slight increase in solvent quality. This shows that combining bases may lead to synergies that improve solvent stability without requiring the use of other additives. Graphic abstract

Dielectric behavior of polyelectrolyte solutions: the role of proton fluctuation

1991 ◽  
Vol 95 (12) ◽  
pp. 4883-4889 ◽  
Author(s):  
F. Bordi ◽  
C. Cametti ◽  
G. Paradossi
Keyword(s):  
Dielectric Behavior ◽  
Polyelectrolyte Solutions

Transport Properties of Polyelectrolyte Solutions. Effect of Confinement in Thin Liquid Films

2015 ◽  
Vol 229 (7-8) ◽  
Author(s):  
Jérôme Delacotte ◽  
Dominique Langevin
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Transport Properties ◽  
Liquid Films ◽  
Thin Liquid Films ◽  
Conductivity Measurements ◽  
Polyelectrolyte Solutions

AbstractThe role of condensed counterions in transport properties, such as electrical conductivity and viscosity, has been investigated with solutions of a flexible polyelectrolyte. Comparisons with existing theories are proposed. Viscosity is strongly affected by confinement in thin films, depending whether polyelectrolyte chains are adsorbed or not at the film surfaces. The role of counterion mobility is however difficult to assess because the measurements are not accurate enough. It is proposed that this role could be tested by electrical conductivity measurements.

scholarly journals THE ROLE OF ORGANOSILICATES ON THE DIELECTRIC RELAXATIONS OF BIOMEDICAL THERMOPLASTIC POLYURETHANE NANOCOMPOSITES

2020 ◽  
Vol 5 (3) ◽  
pp. 145-155
Author(s):  
Azlin Fazlina OSMAN ◽  
◽  
Darren J. MARTIN ◽  
James RUNT ◽  
Pornpen  ATORNGITJAWAT ◽  
...  
Keyword(s):  
Thermoplastic Polyurethane ◽  
Dielectric Relaxations ◽  
Polyurethane Nanocomposites

Evaluation of BAp Orientation Using Mouse Models for Osteoporosis (OPG-KO) and Osteopetrosis (op/op)

2007 ◽  
Vol 26-28 ◽  
pp. 761-764 ◽  
Author(s):  
Jee Wook Lee ◽  
Takayoshi Nakano ◽  
Satoru Toyosawa ◽  
Yasuhiko Tabata ◽  
Yukichi Umakoshi
Keyword(s):  
Mouse Models ◽  
Bone Cells ◽  
Longitudinal Direction ◽  
Bone Microstructure ◽  
Quality Parameter ◽  
X Ray Diffraction ◽  
Orientation Degree ◽  
Biological Apatite ◽  
Preferential Alignment

Bone microstructure and its functions are maintained by the activity of bone cells such as osteoclast for bone resorption and osteoblast for bone formation. In this study, we examined the role of osteoclast on the formation of the preferential orientation of biological apatite (BAp) as a bone quality parameter using OPG-KO and op/op mouse models in which the expression of osteoclast increases for osteoporosis and decreases for osteopetrosis. The orientation degree of the BAp c-axis was analyzed by a microbeam X-ray diffraction system. We found more decrease in the preferential alignment of the BAp c-axis along the longitudinal direction of bone in the femoral bones of both OPG-KO and op/op mice at 12 weeks compared with normal control mice. We concluded that changes in the amount and activity of osteoclast affect BAp alignment, resulting in the degradation of bone microstructure in osteoporosis and osteopetrosis.

Solvent quality influence on the dielectric properties of polyelectrolyte solutions: A scaling approach

2005 ◽  
Vol 72 (3) ◽  
Author(s):  
F. Bordi ◽  
C. Cametti ◽  
T. Gili ◽  
S. Sennato ◽  
S. Zuzzi ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Solvent Quality ◽  
Polyelectrolyte Solutions
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