scholarly journals Preparation and Characterization of Cellulose Acetate Propionate Films Functionalized with Reactive Ionic Liquids

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1217 ◽  
Author(s):  
Joanna Kujawa ◽  
Edyta Rynkowska ◽  
Kateryna Fatyeyeva ◽  
Katarzyna Knozowska ◽  
Andrzej Wolan ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Transport Properties ◽  
Cellulose Acetate ◽  
Force Microscopy ◽  
Water Permeation ◽  
Atomic Force ◽  
Cellulose Acetate Propionate ◽  
Morphology Of Films

1-(1,3-diethoxy-1,3-dioxopropan-2-ylo)-3-methylimidazolium bromide (RIL1_Br), 1-(2-etoxy-2-oxoethyl)-3-methylimidazolium bromide (RIL2_Br), 1-(2-etoxy-2-oxoethyl)-3-methylimidazolium tetrafluoroborate (RIL3_BF4) ionic liquids were synthesized. Subsequently, the dense cellulose acetate propionate (CAP)-based materials containing from 9 to 28.6 wt % of these reactive ionic liquids were elaborated. Reactive ionic liquids (RILs) were immobilized in CAP as a result of the transesterification reaction. The yield of this reaction was over 90% with respect to the used RIL. The physicochemical properties of resultant films were studied using nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), atomic force microscopy (AFM), and thermogravimetric analysis (TGA). The RIL incorporation influenced the morphology of films by increasing their surface roughness with the rise of RIL content. The thermal stability of CAP-based membranes was dependent on the nature of the ionic liquid. Nevertheless, it was proven that CAP films containing RILs were stable up to 120–150 °C. Transport properties were characterized by water permeation tests. It was found that the type and the amount of the ionic liquid in the CAP matrix substantially influenced the transport properties of the prepared hybrid materials.

scholarly journals Synthesis and Characterization of Modified Cellulose Acetate Propionate Nanocomposites via Sol-Gel Process

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Patrycja Wojciechowska ◽  
Zenon Foltynowicz ◽  
Marek Nowicki
Keyword(s):  
Cellulose Acetate ◽  
Sol Gel ◽  
Hybrid Nanocomposites ◽  
Organic Polymer ◽  
Nmr Studies ◽  
Force Microscopy ◽  
Atomic Force ◽  
Cellulose Acetate Propionate ◽  
Sol Gel Process ◽  
Modified Cellulose

In this study novel organic-inorganic hybrid nanocomposites were synthesized from modified cellulose acetate propionate (MCAP) via sol-gel reaction at ambient temperature. The inorganic phase was introduced in situ by hydrolysis-condensation of tetraethoxysilane (TEOS) in different concentrations, under acid catalysis, in the presence of organic polymer dissolved in acetone. The chemical modification of CAP was monitored by infrared spectroscopy (IR). The nanocomposites structure was characterized by IR analysis and solid state29Si NMR studies. The spectral data revealed that organic and inorganic phases are linked through covalent bound. Surface morphology of the samples and the degree of dispersion of inorganic phase in the polymer matrix were investigated using atomic force microscopy (AFM) and scanning electron microscopy (SEM). The actual incorporation of the inorganic component into the hybrid nanocomposites was deducted from the residual weight according to thermogravimetric analysis (TGA).

scholarly journals The Effect of Reactive Ionic Liquid or Plasticizer Incorporation on the Physicochemical and Transport Properties of Cellulose Acetate Propionate-Based Membranes

Polymers ◽  
2018 ◽  
Vol 10 (1) ◽  
pp. 86 ◽  
Author(s):  
Edyta Rynkowska ◽  
Kateryna Fatyeyeva ◽  
Joanna Kujawa ◽  
Krzysztof Dzieszkowski ◽  
Andrzej Wolan ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Transport Properties ◽  
Cellulose Acetate ◽  
Cellulose Acetate Propionate

scholarly journals Nanostructure of [Li(G4)] TFSI and [Li(G4)] NO3solvate ionic liquids at HOPG and Au(111) electrode interfaces as a function of potential

2015 ◽  
Vol 17 (1) ◽  
pp. 325-333 ◽  
Author(s):  
Ben McLean ◽  
Hua Li ◽  
Ryan Stefanovic ◽  
Ross J. Wood ◽  
Grant B. Webber ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Double Layer ◽  
Pyrolytic Graphite ◽  
Force Measurements ◽  
Force Microscopy ◽  
Electrode Surfaces ◽  
Atomic Force ◽  
Highly Ordered Pyrolytic Graphite

Atomic force microscopy (AFM) force measurements have been used to study the solvate ionic liquid (IL) double layer nanostructure at highly ordered pyrolytic graphite (HOPG) and Au(111) electrode surfaces as a function of potential.

scholarly journals Membranes for Cation Transport Based on Dendronized Poly(Epichlorohydrin-Co-Ethylene Oxide). Part 2: Membrane Characterization and Transport Properties

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3915
Author(s):  
Alireza Zare ◽  
Xavier Montané ◽  
José Antonio Reina ◽  
Marta Giamberini
Keyword(s):  
Transport Properties ◽  
Liquid Crystalline ◽  
Linear Sweep Voltammetry ◽  
Cation Transport ◽  
Side Chain ◽  
Force Microscopy ◽  
Atomic Force ◽  
Membrane Characterization ◽  
Alkaline Cations

In this paper, we report on the preparation and characterization of membranes out of two side-chain liquid crystalline copolymers, dendronized at two different extents (20 and 40%, CP20 and CP40, respectively). The membranes were characterized by atomic force microscopy (AFM), field-emission scanning electron microscopy (FESEM), contact angle (CA) analysis, and water uptake. Moreover, transport properties were studied by methanol and proton conductivity experiment and by linear sweep voltammetry (LSV). For the sake of comparison, the behavior of the grafted copolymers was compared with the unmodified copolyether CP0 and with Nafion 117. Results demonstrated that in CP20 and CP40, cation transport depends on the presence of defined cationic channels, not affected by water presence; the comparison between LSV experiments performed with different alkaline cations suggests that CP40 possesses channels with larger diameters and better-defined inner structures.

scholarly journals IR and electrochemical synthesis and characterization of thin films of PEDOT grown on platinum single crystal electrodes in [EMMIM]Tf2N ionic liquid

2015 ◽  
Vol 11 ◽  
pp. 348-357 ◽  
Author(s):  
Andrea P Sandoval ◽  
Marco F Suárez-Herrera ◽  
Juan M Feliu
Keyword(s):  
Thin Films ◽  
Ionic Liquid ◽  
Redox Reactions ◽  
Charge Carriers ◽  
In Situ Ftir Spectroscopy ◽  
Force Microscopy ◽  
Atomic Force ◽  
Platinum Single Crystal

Thin films of PEDOT synthesized on platinum single electrodes in contact with the ionic liquid 1-ethyl-2,3-dimethylimidazolium triflimide ([EMMIM]Tf2N) were studied by cyclic voltammetry, chronoamperometry, infrared spectroscopy and atomic force microscopy. It was found that the polymer grows faster on Pt(111) than on Pt(110) or Pt(100) and that the redox reactions associated with the PEDOT p-doping process are much more reversible in [EMMIM]Tf2N than in acetonitrile. Finally, the ion exchange and charge carriers’ formation during the p-doping reaction of PEDOT were studied using in situ FTIR spectroscopy.

Rapid, Refined, and Robust Method for Expression, Purification, and Characterization of Recombinant Human Amyloid-beta M1-42

2019 ◽  
Author(s):  
Priya Prakash ◽  
Travis Lantz ◽  
Krupal P. Jethava ◽  
Gaurav Chopra
Keyword(s):  
Amyloid Beta ◽  
Western Blots ◽  
Force Microscopy ◽  
E Coli ◽  
Atomic Force ◽  
Set Up ◽  
Short Time

Amyloid plaques found in the brains of Alzheimer’s disease (AD) patients primarily consists of amyloid beta 1-42 (Ab42). Commercially, Ab42 is synthetized using peptide synthesizers. We describe a robust methodology for expression of recombinant human Ab(M1-42) in Rosetta(DE3)pLysS and BL21(DE3)pLysS competent E. coli with refined and rapid analytical purification techniques. The peptide is isolated and purified from the transformed cells using an optimized set-up for reverse-phase HPLC protocol, using commonly available C18 columns, yielding high amounts of peptide (~15-20 mg per 1 L culture) in a short time. The recombinant Ab(M1-42) forms characteristic aggregates similar to synthetic Ab42 aggregates as verified by western blots and atomic force microscopy to warrant future biological use. Our rapid, refined, and robust technique to purify human Ab(M1-42) can be used to synthesize chemical probes for several downstream in vitro and in vivo assays to facilitate AD research.

Stereometric characterization of Dinizia excelsa Ducke wood from Amazon rainforest using atomic force microscopy

2021 ◽  
Author(s):  
Willian Silva Conceição ◽  
Ştefan Ţălu ◽  
Robert Saraiva Matos ◽  
Glenda Quaresma Ramos ◽  
Fidel Guereiro Zayas ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Amazon Rainforest ◽  
Force Microscopy ◽  
Atomic Force ◽  
Dinizia Excelsa

scholarly journals Effect of water on the electroresponsive structuring and friction in dilute and concentrated ionic liquid lubricant mixtures

2020 ◽  
Vol 22 (48) ◽  
pp. 28191-28201
Author(s):  
Georgia A. Pilkington ◽  
Rebecca Welbourn ◽  
Anna Oleshkevych ◽  
Seiya Watanabe ◽  
Patricia Pedraz ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Ionic Liquid ◽  
Neutron Reflectivity ◽  
Force Microscopy ◽  
Liquid Lubricant ◽  
Effect Of Water ◽  
Atomic Force ◽  
Ambient Levels

The influence of ambient levels of water on the electroresponsive interfacial structuring and nanofriction of ionic liquid lubricant mixtures has been investigated by neutron reflectivity and atomic force microscopy.

scholarly journals A Universal Model for the Log-Normal Distribution of Elasticity in Polymeric Gels and Its Relevance to Mechanical Signature of Biological Tissues

Biology ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 64
Author(s):  
Arnaud Millet
Keyword(s):  
Elastic Modulus ◽  
Normal Distribution ◽  
Biological Tissues ◽  
Force Microscopy ◽  
Polymeric Gels ◽  
Atomic Force ◽  
Clear Explanation ◽  
Log Normal ◽  
Log Normal Distribution

The mechanosensitivity of cells has recently been identified as a process that could greatly influence a cell’s fate. To understand the interaction between cells and their surrounding extracellular matrix, the characterization of the mechanical properties of natural polymeric gels is needed. Atomic force microscopy (AFM) is one of the leading tools used to characterize mechanically biological tissues. It appears that the elasticity (elastic modulus) values obtained by AFM presents a log-normal distribution. Despite its ubiquity, the log-normal distribution concerning the elastic modulus of biological tissues does not have a clear explanation. In this paper, we propose a physical mechanism based on the weak universality of critical exponents in the percolation process leading to gelation. Following this, we discuss the relevance of this model for mechanical signatures of biological tissues.

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