New Insights on Solvent Implications in the Design of Materials Based on Cellulose Derivatives Using Experimental and Theoretical Approaches

The current paper presents a strategic way to design and develop materials with properties adapted for various applications from biomedicine to environmental applications. In this context, blends of (hydroxypropyl)methyl cellulose (HPMC) and poly(vinylpyrrolidone) (PVP) were obtained to create new materials that can modulate the membrane properties in various fields. Thus, to explore the possibility of using the HPMC/PVP system in practical applications, the solubility parameters in various solvents were initially evaluated using experimental and theoretical approaches. In this frame, the study is aimed at presenting the background and steps of preliminary studies to validate the blends behavior for targeted application before being designed. Subsequently, the analysis of the behavior in aqueous dilute solution of HPMC/PVP blend offers information about the conformational modifications and interactions manifested in system depending on the structural characteristics of polymers (hydrophilicity, flexibility), polymer mixtures composition, and used solvent. Given this background, based on experimental and theoretical studies, knowledge of hydrodynamic parameters and analysis of the optimal compositions of polymer mixtures are essential for establishing the behavior of obtained materials and validation for most suitable applications. Additionally, to guarantee the quality and functionality of these composite materials in the targeted applications, e.g., biomedical or environmental, the choice of a suitable solvent played an important role.

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Structure and Dynamics of Colloid-Polymer Mixtures in Dilute Solution Under Shear

The Proceedings of Conference of Kanto Branch ◽

10.1299/jsmekanto.2021.27.10c12 ◽

2021 ◽

Vol 2021.27 (0) ◽

pp. 10C12

Author(s):

Yusei KOBAYASHI ◽

Noriyoshi ARAI ◽

Arash NIKOUBASHMAN

Keyword(s):

Dilute Solution ◽

Polymer Mixtures ◽

Structure And Dynamics

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Effect of 1,4-Napthaquinone (NQ) and benzophenone (BPH)on the photodegradation and biodegradation of methyl cellulose film

Baghdad Science Journal ◽

10.21123/bsj.7.1.737-744 ◽

2010 ◽

Vol 7 (1) ◽

pp. 737-744

Author(s):

Baghdad Science Journal

Keyword(s):

Molecular Weight ◽

Film Thickness ◽

Carbonyl Compounds ◽

Methyl Cellulose ◽

Chain Scission ◽

Cellulose Derivative ◽

Accelerated Weathering ◽

Cellulose Derivatives ◽

Photodegradation Rate ◽

Aromatic Carbonyl Compounds

The induced photodegradation of methyl cellulose (MC) films in air was investigated in the absence and presence of aromatic carbonyl compounds(photosenssitizers): 1,4-naphthaquinone (NQ) and benzophenone (BPH) by accelerated weathering tester. The addition of (0.01 wt %) of low molecular weight aromatic carbonyl compounds to cellulose derivatives films(25µm in thickness) enhanced the photodegradation of the polymer films.The photodegradation rate was measured by the increase in carbonyl absorbance. Decreases in solution viscosity and reduction of molecular weight were also observed in the irradiated samples. Changes in the number-average chain scission, the degree of deterioration and in the quantum yield of chain scission values are also observed, and it was concluded that branching or cross-linking has occurred for cellulose derivative with NQ and BPH. Findings from all analytical techniques indicated that the 1,4-naphthaquinone (NQ) photosensitizer enhance the photodegradation of methyl cellulose more than benzophenone (BPH). The effect of the photosensitizer concentration, (ranging from 0.01 to 0.1 %), on the rate of photodegradation was also monitored for MC films. The rates are increased with increasing the photosensitizer concentration. The effect of film thickness is also studied at fixed sensitizer concentration (0.05%), and results show that the rate of cellulose derivative photodegradation decreases with increasing film thickness. The rate constants of the photodegradation of the photosensitizers deduced in cellulose derivatives films, [at concentration of (0.1%)by weight and thickness (25µm)]. Biodegradation of irradiated cellulose derivatives films was conclusively established with bacteria type Pseudomonas aeuroginosa Rb-19 isolated from crude oil. The amount of bacteria growth on MC after 30 days was lower, while there was no growth observed in MC with BPH

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Machine Learning Analysis and Prediction Models of Alkaline Anion Exchange Membranes for Fuel Cells

Energy & Environmental Science ◽

10.1039/d1ee01170g ◽

2021 ◽

Author(s):

Xiuyang Zou ◽

Ji Pan ◽

Zhe Sun ◽

Bowen Wang ◽

Zhiyu Jin ◽

...

Keyword(s):

Machine Learning ◽

Fuel Cells ◽

Anion Exchange ◽

Prediction Models ◽

Anion Exchange Membranes ◽

Theoretical Studies ◽

Practical Applications ◽

Alkaline Membrane ◽

Learning Analysis ◽

Experimental And Theoretical Studies

The degradation of anion exchange membranes (AEMs) hindered the practical applications of alkaline membrane fuel cells. This issue has inspired a large number of both experimental and theoretical studies. However,...

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Structural characteristics of binary biopolymers-based emulsion-filled gels: A case of mixed sodium caseinate/methyl cellulose emulsion gels

Food Structure ◽

10.1016/j.foostr.2021.100233 ◽

2021 ◽

pp. 100233

Author(s):

Peiyuan Li ◽

Xiaofei Li ◽

Tanzeela Nisar ◽

Xudong Yang ◽

Jiaojiao Sun ◽

...

Keyword(s):

Structural Characteristics ◽

Methyl Cellulose ◽

Sodium Caseinate

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Knowledge Communication with Shared Databases

Handbook of Research on Computer Mediated Communication ◽

10.4018/978-1-59904-863-5.ch032 ◽

2011 ◽

pp. 424-435 ◽

Cited By ~ 2

Author(s):

Joachim Kimmerle ◽

Ulrike Cress

Keyword(s):

Computer Mediated Communication ◽

Future Trends ◽

Mediated Communication ◽

Practical Applications ◽

Technological Factors ◽

Empirical Results ◽

Theoretical Approaches ◽

Computer Mediated ◽

The Impact ◽

Knowledge Communication

Addressing knowledge communication with shared databases, this chapter focuses on an asynchronous, many-to-many type of computer-mediated communication (CMC). After an introduction, which characterizes this kind of CMC and provides definitions, various aspects are discussed that influence people’s behavior in knowledge communication with shared databases. This presentation focuses on psychological rather than on technological factors. The first aspect presented is the influence of anonymity and identifiability, followed by the impact of metaknowledge. Next, costs and bonus systems, and then feedback and guidelines are discussed. Other aspects which are considered are group size and participant personality. For each of these influencing factors, underlying theoretical approaches as well as empirical results are presented. Subsequently, these considerations and findings are examined with respect to their practical applications. In conclusion, future trends in database-oriented knowledge communication are discussed.

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Rheological Properties and Associated Structural Characteristics of Some Aromatic Polycondensates Including Liquid-Crystalline Polyesters and Cellulose Derivatives (IUPAC Technical Report)

Chemistry International ◽

10.1515/ci.2005.27.2.25a ◽

2005 ◽

Vol 27 (2) ◽

Keyword(s):

Rheological Properties ◽

Liquid Crystalline ◽

Structural Characteristics ◽

Cellulose Derivatives ◽

Technical Report

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Knowledge Communication with Shared Databases

Database Technologies ◽

10.4018/978-1-60566-058-5.ch102 ◽

2009 ◽

pp. 1670-1681 ◽

Cited By ~ 1

Author(s):

Joachim Kimmerle ◽

Ulrike Cress

Keyword(s):

Computer Mediated Communication ◽

Future Trends ◽

Mediated Communication ◽

Practical Applications ◽

Technological Factors ◽

Empirical Results ◽

Theoretical Approaches ◽

Computer Mediated ◽

The Impact ◽

Knowledge Communication

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Learning control with interpolating memories—general ideas, design lay-out, theoretical approaches and practical applications

International Journal of Control ◽

10.1080/00207179208934316 ◽

1992 ◽

Vol 56 (2) ◽

pp. 291-317 ◽

Cited By ~ 18

Author(s):

H. TOLLE ◽

P. C. PARKS ◽

E. ERSÜ ◽

M. HORMEL ◽

J. MILITZER

Keyword(s):

Learning Control ◽

Practical Applications ◽

Theoretical Approaches

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Skin and bubble formation in films made of methyl nanocellulose, hydrophobically modified ethyl(hydroxyethyl)cellulose and microfibrillated cellulose

Cellulose ◽

10.1007/s10570-020-03557-0 ◽

2020 ◽

Author(s):

Johanna Lyytikäinen ◽

Maria Morits ◽

Monika Österberg ◽

Isto Heiskanen ◽

Kaj Backfolk

Keyword(s):

Methyl Cellulose ◽

Microfibrillated Cellulose ◽

Hydroxyethyl Cellulose ◽

Effect Of Temperature ◽

Cellulose Derivatives ◽

Air Bubbles ◽

Oxygen Transmission Rate ◽

Hydrophobically Modified ◽

Film Forming ◽

Ethyl Hydroxyethyl Cellulose

AbstractThe use of nanomaterials and polymers from renewable resources is important in the search for sustainable alternatives to plastic-based packaging materials and films. In this work, self-supporting thin films prepared from derivatized and non-derivatized nanocellulose and cellulose derivatives were studied. The effect of drying temperature on the film-forming behavior of compositions comprising hydrophobically modified ethyl(hydroxyethyl)cellulose (EHEC), native microfibrillated cellulose (MFC) and nanocellulose made from methyl cellulose was determined. The interaction between the components was assessed from viscosity measurements made at different temperatures, the result being linked to a thermal-dependent association during liquid evaporation, and the subsequent barrier and film-forming properties. The effect of temperature on suspensions was clearly different between the materials, confirming that there were differences in interaction and association between EHEC–MFC and methyl nanocellulose–MFC compositions. The amphiphilic EHEC affected both the suspension homogeneity and the film properties. Air bubbles were formed under certain conditions and composition particularly in MFC films, dependent on the drying procedure. The presence of air bubbles did not affect the oxygen transmission rate or the oil and grease resistance. An increasing amount of MFC improved the oxygen barrier properties of the films.

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Simple Ion Transfer at Liquid|Liquid Interfaces

International Journal of Electrochemistry ◽

10.1155/2012/462197 ◽

2012 ◽

Vol 2012 ◽

pp. 1-34 ◽

Cited By ~ 15

Author(s):

L. J. Sanchez Vallejo ◽

J. M. Ovejero ◽

R. A. Fernández ◽

S. A. Dassie

Keyword(s):

Charge Transfer ◽

Numerical Simulations ◽

Phase Transfer ◽

Electrolyte Solutions ◽

Ion Transfer ◽

Liquid Interfaces ◽

Practical Applications ◽

Theoretical Approaches ◽

Charge Transfer Reactions

The main aspects related to the charge transfer reactions occurring at the interface between two immiscible electrolyte solutions (ITIES) are described. The particular topics to be discussed involve simple ion transfer. Focus is given on theoretical approaches, numerical simulations, and experimental methodologies. Concerning the theoretical procedures, different computational simulations related to simple ion transfer are reviewed. The main conclusions drawn from the most accepted models are described and analyzed in regard to their relevance for explaining different aspects of ion transfer. We describe numerical simulations implementing different approaches for solving the differential equations associated with the mass transport and charge transfer. These numerical simulations are correlated with selected experimental results; their usefulness in designing new experiments is summarized. Finally, many practical applications can be envisaged regarding the determination of physicochemical properties, electroanalysis, drug lipophilicity, and phase-transfer catalysis.

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