A polyelectrolyte brush theory

Misra, Sanjay; Varanasi, Sasidhar; Varanasi, Padma Prabodh

doi:10.1021/ma00201a007

Cited by 154 publications

(165 citation statements)

References 12 publications

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“…The thickness of the brush layer has been calculated from neutron-scattering experiments on end-grafted polymers [328] and charged diblock-copolymers at the air-water interface [330]. Theoretical work on PE brushes was initiated by the works of Miklavic and Marcelja [319] and Misra et al [320]. In 1991, Pincus [321] and Borisov, Birshtein and Zhulina [322] presented scaling theories for charged brushes in the so-called osmotic regime, where the brush height results from the balance between the chain elasticity (which tends to decrease the brush height) and the repulsive osmotic counterion pressure (which tends to increase the brush height).…”

Section: Charged Grafted Polymersmentioning

confidence: 99%

Neutral and charged polymers at interfaces

2003

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Chain-like macromolecules (polymers) show characteristic adsorption properties due to their flexibility and internal degrees of freedom, when attracted to surfaces and interfaces. In this review we discuss concepts and features that are relevant to the adsorption of neutral and charged polymers at equilibrium, including the type of polymer/surface interaction, the solvent quality, the characteristics of the surface, and the polymer structure. We pay special attention to the case of charged polymers (polyelectrolytes) that have a special importance due to their water solubility. We present a summary of recent progress in this rapidly evolving field. Because many experimental studies are performed with rather stiff biopolymers, we discuss in detail the case of semi-flexible polymers in addition to flexible ones. We first review the behavior of neutral and charged chains in solution. Then, the adsorption of a single polymer chain is considered. Next, the adsorption and depletion processes in the many-chain case are reviewed. Profiles, changes in the surface tension and polymer surface excess are presented. Mean-field and corrections due to fluctuations and lateral correlations are discussed. The force of interaction between two adsorbed layers, which is important in understanding colloidal stability, is characterized. The behavior of grafted polymers is also reviewed, both for neutral and charged polymer brushes.

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Section: Charged Grafted Polymersmentioning

confidence: 99%

Neutral and charged polymers at interfaces

2003

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“…In very few cases it can be an offshoot of other metabolic disorders. We have reviewed the available ayurvedic/traditional texts books [25][26][27][28] for searching plants which are indicated for obesity. The detailed list of plants has been depicted in Table 1.…”

Section: Traditional Medicine and Obesitymentioning

confidence: 99%

Review Article: Herbal Approach for Obesity Management

Chandrasekaran¹,

Vijayalakshmi²,

Prakash³

et al. 2012

AJPS

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Obesity, a complex interplay between environmental and genetic factors and is associated with significant morbidity and mortality. Usage of herbs for the management of obesity in the recent times is attracting attention. A web and manual based literature survey was conducted to assess the amount of information available on the herbal products for weight management. Traditional literature, PubMed, Scopus, Google scholar databases were screened up to February 2012. The search words were "obesity", "herbal medicine/products/extracts", "medicinal plants", "traditional medicine", "Ayurvedic medicine" without narrowing/limiting searching words or elements. Publications only with abstracts/full articles and books were reviewed in the search. Based on the available literature, for many of the herbal and weight loss products, there is little published information and there have been no clinical trials or the level of evidence is limited. Our literature survey also indicated that these herbal products fall under an acceptable level of evidence or with no scientific background at all, or they have a scientific rational but not to an acceptance level. Attempts were made in the review to define the features of possible herbal weight loss product. An ideal herbal anti obesity product should reduce the weight by 10% over placebo of treatment by showing an evidence of improvement of bio markers like blood pressure, lipids and glycemia without any side effects.

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“…Theoretical work on PE brushes was initiated by the works of Miklavic and Marcelja [74] and Misra et al [75]. In 1991, Pincus [76] and Borisov, Birshtein and Zhulina [77] presented scaling theories for charged brushes in the so-called osmotic regime, where the brush height results from the balance between the chain elasticity (which tends to decrease the brush height) and the repulsive osmotic counter-ion pressure (which tends to increase the brush height).…”

Section: Additional Effectsmentioning

confidence: 99%

Theoretical Approaches to Neutral and Charged Polymer Brushes

Naji

Seidel

Netz

Advances in Polymer Science

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Neutral or charged polymers that are densely end-grafted to surfaces form brushlike structures and are highly stretched under good-solvent conditions. We discuss and compare relevant results from scaling models, self-consistent-field methods and MD simulation techniques and concentrate on the conceptual simple case of planar substrates. For neutral polymers the main quantity of interest is the brush height and the polymer density profile, which can be well predicted from self-consistent calculations and simulations. Charged polymers (polyelectrolytes) are of practical importance since they are soluble in water. Counterion degrees of freedom determine the brush behavior in a decisive way and lead to a strong and non-linear swelling of the brush.

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A polyelectrolyte brush theory

Cited by 154 publications

References 12 publications

Neutral and charged polymers at interfaces

Neutral and charged polymers at interfaces

Review Article: Herbal Approach for Obesity Management

Theoretical Approaches to Neutral and Charged Polymer Brushes

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