scholarly journals EFFICIENCY ESTIMATION OF MODIFIED CELLULOSE BASED MEMBRANES

2018 ◽  
pp. 51-58
Author(s):  
O.M. Movchaniuk ◽  
N.D. Gomelya
Keyword(s):  
Colloidal Particles ◽  
Specific Capacity ◽  
Cellulose Fiber ◽  
Water Turbidity ◽  
Fiber Modification ◽  
Operational Characteristics ◽  
Cationization Agent ◽  
Efficiency Estimation ◽  
Modified Cellulose

The article is focused on production of softwood sulfate bleached cellulose modified based  membranes for water filtering from suspended and colloidal particles causing water turbidity  and from soluble substances determining colourity of water as well. The influence of  cationization agent consumption on cellulose fiber modification, pressure and duration of  filtering on operational characteristics of membranes (specific capacity, colourity, turbidity  of water, selectivity according to water turbidity and colourity) when filtering of  simulative humates solution, has been examined. Bibl. 6, Fig. 6, Tab. 3.

ZnO-modified cellulose fiber sheets for antibody immobilization

2014 ◽  
Vol 109 ◽  
pp. 139-147 ◽  
Author(s):  
Vinay Khatri ◽  
Katalin Halász ◽  
Lidija V. Trandafilović ◽  
Suzana Dimitrijević-Branković ◽  
Paritosh Mohanty ◽  
...  
Keyword(s):  
Cellulose Fiber ◽  
Antibody Immobilization ◽  
Modified Cellulose

Preparation and Characterization of Modified Cellulose Fiber-Reinforced Polyvinyl Alcohol/Polypyrrolidone Hybrid Film Composites

2012 ◽  
Vol 49 (8) ◽  
pp. 639-647 ◽  
Author(s):  
Sandeep S. Laxmeshwar ◽  
S. Viveka ◽  
D. J. Madhu Kumar ◽  
Dinesha ◽  
R. F. Bhajanthri ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Hybrid Film ◽  
Cellulose Fiber ◽  
Fiber Reinforced ◽  
Modified Cellulose ◽  
Film Composites

scholarly journals THE INFLUENCE OF SURFACE DESTRUCTION ON THE HYDROPHILICITY AND ABILITY TO FORM CONNEC-TIONS OF THE CELLULOSE FIBERS

2020 ◽  
pp. 315-320
Author(s):  
Iraida Ivanovna Osovskaya ◽  
Veronika Sergeyevna Antonova
Keyword(s):  
Acid Hydrolysis ◽  
Binding Capacity ◽  
Cellulose Fiber ◽  
Cellulose Fibers ◽  
Water Shortage ◽  
Structural Heterogeneity ◽  
Main Role ◽  
Partial Acid Hydrolysis ◽  
Surface Destruction ◽  
Modified Cellulose

When using cellulose fibers to produce paper, the main role is played by the state of the surface of the fiber and its ability to adhesive-cohesive interaction. The main indicators characterizing the surface of the fiber are development and roughness, chemical heterogeneity, depending on the presence of various functional groups, as well as structural heterogeneity of the surface layers, leading to the formation of a stronger bond between the fibers. The surface modification of the fiber was carried out by partial acid hydrolysis. The study is aimed at optimizing hydrolysis, choosing methods for its control, obtaining physicochemical and physicomechanical characteristics of partially hydrolyzed cellulose, and increasing the ability to bind cellulose fiber. A method has been developed for producing modified cellulose with improved adhesion-cohesive properties by surface destruction of wet cellulose fibers during hydrolysis. The patterns of activation of the surface properties of cellulose fibers are obtained. The effect of partial acid hydrolysis on the development of the surface of the fiber in the absence of "wet" grinding with water shortage is shown. The effect of short chains and reducing carbonyl groups of cellulose macromolecules on the binding capacity of modified cellulose has been established. The optimal content of short chains of cellulose macromolecules, which is 12%. Such a content of short chains of modified fibers by acid hydrolysis was detected at a temperature of 363 K and an exposure time of 40 s; under these optimal conditions, the strength of the experimental castings increases by 70%.

Antibacterial evaluation of CNF/PVAm multilayer modified cellulose fiber and cellulose model surface

2018 ◽  
Vol 33 (3) ◽  
pp. 385-396 ◽  
Author(s):  
Chao Chen ◽  
Monica Ek
Keyword(s):  
Surface Roughness ◽  
Cell Damage ◽  
Cellulose Fiber ◽  
Middle Layer ◽  
Dominant Factor ◽  
Antibacterial Efficacy ◽  
Modified Model ◽  
Structured Surfaces ◽  
Model Surfaces ◽  
Modified Cellulose

Abstract Earlier studies have shown that 3-layer-modified cellulose fibers with poly(acrylic acid) (PAA) as the middle layer between two cationic polyelectrolyte polyvinylamine (PVAm) layers have strong antibacterial efficacy in terms of both bacteria adsorption and bacterial growth inhibition. In the present work, the fossil-based PAA middle layer was replaced by sustainable wood-based cellulose nano-fibrils (CNF), i. e., the fibers were modified by a 3-layer PVAm/CNF/PVAm system. Interestingly, the antibacterial efficacy of this system was greater than that of the previous PVAm/PAA/PVAm system. A higher salt concentration and lower assembly pH in the multilayer build-up resulted in better bacterial reduction. As the surface of a cellulose fiber is heterogeneous, making it difficult to characterize and visualize at high resolution, more homogeneous cellulose model surfaces were prepared by spin coating the dissolved cellulose fiber onto a silica surface to model the fiber surface. With increasing ionic strength, more aggregated and heterogeneous structures can be observed on the PVAm/CNF/PVAm modified model surfaces. The adsorbed bacteria distributed on the structured surfaces were clearly seen under fluorescence microscopy. Adsorbed amounts of bacteria on either aggregate or flat regions were quantified by scanning electron microscopy (SEM). More adsorbed bacteria were clearly seen on aggregates than on the flat regions at the surfaces. Degrees of bacteria deformation and cell damage were also seen under SEM. The surface roughness of the modified model surfaces was examined by atomic force microscopy (AFM), and a positive correlation was found between the surface roughness and the bacterial adhesion. Thus, an additional factor that controls adhesion, in addition to the surface charge, which is probably the most dominant factor affecting the bacteria adhesion, is the surface structures, such as roughness.

scholarly journals Cellulose-based water purification using paper filters modified with polyelectrolyte multilayers to remove bacteria from water through electrostatic interactions

2018 ◽  
Vol 4 (12) ◽  
pp. 2070-2079 ◽  
Author(s):  
Anna Ottenhall ◽  
Jonatan Henschen ◽  
Josefin Illergård ◽  
Monica Ek
Keyword(s):  
Water Purification ◽  
Electrostatic Interactions ◽  
Fiber Surface ◽  
Cellulose Fiber ◽  
Polyelectrolyte Multilayers ◽  
Modified Cellulose ◽  
Contaminated Waters

Bacteria are removed from contaminated waters through adsorption onto the modified cellulose fiber surface in paper filters with pores larger than the bacteria.

Properties of rubber-modified cellulose-fiber-epoxy laminates

1994 ◽  
Vol 54 (13) ◽  
pp. 2191-2193 ◽  
Author(s):  
I. M. Low ◽  
P. Schmidt ◽  
J. Lane ◽  
M. McGrath
Keyword(s):  
Cellulose Fiber ◽  
Modified Cellulose
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