EFFECT OF SURFACE TREATMENT ON THE ENZYMATIC TREATMENT OF CELLULOSIC FIBER

2007 ◽  
Vol 14 (04) ◽  
pp. 565-569 ◽  
Author(s):  
C. W. KAN ◽  
C. W. M. YUEN ◽  
S. Q. JIANG
Keyword(s):  
Enzymatic Reaction ◽  
Enzyme Treatment ◽  
Chemical Waste ◽  
Temperature Plasma ◽  
Surface Appearance ◽  
Significant Strength ◽  
Pre Treatment ◽  
Fabric Surface ◽  
Finishing Processes ◽  
Effect Of Surface

Fiber modifications by environmentally friendly processing are essential in order to simplify the preparation and finishing processes, in addition to minimizing the chemical waste and associated disposal problem. In this regard, enzymes have been used extensively because it can remove the small fiber ends from yarn surface to create a smooth fabric surface appearance and introduce a degree of softness without using traditional chemical treatment. However, a significant strength reduction and slow reaction rate of the enzymatic reaction limit its industrial application. In this paper, the potential of using low-temperature plasma (LTP) as a surface pre-treatment prior to enzyme treatment on flax fiber has been studied. By means of the LTP pre-treatment, the effectiveness of enzyme treatment can be enhanced.

Effect of surface pre-treatment on the behaviour of adhesively-bonded CFRP T-joints

2019 ◽  
Vol 104 ◽  
pp. 1188-1202 ◽  
Author(s):  
João V. Cardoso ◽  
Pedro V. Gamboa ◽  
Abílio P. Silva
Keyword(s):  
Adhesively Bonded ◽  
T Joints ◽  
Pre Treatment ◽  
Effect Of Surface

The effect of surface pre-treatment and coating post-treatment to the properties of TiN coatings

2012 ◽  
Vol 18 (3) ◽  
pp. 185 ◽  
Author(s):  
E Adoberg ◽  
V Podgurski ◽  
P Peetsalu ◽  
L Lind ◽  
V Mikli ◽  
...  
Keyword(s):  
Post Treatment ◽  
Tin Coatings ◽  
Pre Treatment ◽  
Effect Of Surface

scholarly journals Effect of Surface and Subsurface Defects on Fatigue Behavior of AlSi10Mg Alloy Processed by Laser Powder Bed Fusion (L-PBF)

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1063 ◽  
Author(s):  
Milad Hamidi Nasab ◽  
Alessandro Giussani ◽  
Dario Gastaldi ◽  
Valeria Tirelli ◽  
Maurizio Vedani
Keyword(s):  
Crack Nucleation ◽  
Fatigue Behavior ◽  
Fatigue Behaviour ◽  
Surface Finishing ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Finishing Processes ◽  
Effect Of Surface ◽  
Subsurface Defects

The fatigue behaviour of an AlSi10Mg alloy processed by laser powder bed fusion (L-PBF) and subjected to different surface finishing processes was investigated paying special attention to the residual defects on the surface and the dominant fatigue failure mechanisms. Roughness measurements and qualitative surface morphology analysis showed smooth surfaces in the case of vibro-finishing and machining followed by polishing. The fatigue performance did not reveal to be directly related to surface roughness, but residual intrusions left on the finished surfaces. Post-mortem analysis showed single- or multiple-crack nucleation from pores opened on the surface, un-melted powders, or spatters considered as typical L-PBF defects. A fatigue limit of 195 MPa for machined and polished samples was obtained by substantial removal of surface and subsurface defects.

Influence of Low Temperature Plasma on Chitosan/ Waterborne Polyurethane Finishing on Cotton Fabric

2014 ◽  
Vol 1051 ◽  
pp. 117-120
Author(s):  
Wei Ling Wang ◽  
Wei Dong Yu
Keyword(s):  
Water Vapor ◽  
Volume Ratio ◽  
Water Vapor Permeability ◽  
Waterborne Polyurethane ◽  
Vapor Permeability ◽  
Temperature Plasma ◽  
Aqueous Emulsion ◽  
Recovery Performance ◽  
Pre Treatment ◽  
Property Changes

Waterborne polyurethane and chitosan were mixed in different volume ratio, and finished on the cotton of plasma pre-treatment and non-plasma pre-treatment to discuss the influence of plasma pretreatment on the properties of the fabric. Firstly, the mixed aqueous emulsion was made into film and analyzed by FTIR. Secondly, the relationship between the properties of whiteness, wrinkle recovery performance and water vapor permeability of the fabric that finished by the only blended solution and the mixed ratio was studied. Finally, the property changes between the pretreatment with and without plasma was compared. The results showed that, the blended film not only had both polyurethane and chitosan characteristic peaks, but also generated the new characteristic peaks; the three properties of the fabric that finished by the only blended solution changed with the mixed ratio; the plasma pre-treatment would increase the fabric’s whiteness, decrease wrinkle recovery performance, but the water vapor permeability would improve obviously.

scholarly journals A Rapid and Efficient Autoclave Pre-Treatment to Extract Iodine-129 from Urine Samples for AMS Analysis

2020 ◽  
Author(s):  
Fahad Alotaibi ◽  
Matthew N. Herod ◽  
R. Jack Cornett
Keyword(s):  
Human Urine ◽  
Urine Samples ◽  
New Method ◽  
Isotopic Ratios ◽  
Relative Importance ◽  
Chemical Waste ◽  
Human Diet ◽  
Pre Treatment ◽  
Yield Tracer ◽  
Iodine Sufficiency

<p>A new method was developed to extract <sup>129</sup>I from urine samples and then measure it by AMS. The samples were pre-treated in an autoclave with hydrogen peroxide to remove unwanted compounds from the urine samples and were acidified with nitric acid, followed by precipitation of iodine as silver iodide (AgI) for measurement by AMS. This new procedure is substantially faster than previous methods for the extraction of iodine from urine and results in less chemical waste. The efficiency and reproducibility of this method were evaluated by using <sup>125</sup>I as a yield tracer, eventually giving a recovery above 99%. To achieve this, several iterations of the method were required. The method was then successfully applied to measure <sup>129</sup>I/<sup>127</sup>I isotopic ratios and <sup>129</sup>I concentrations in 25 human urine samples. The AMS results for <sup>129</sup>I in urine ranged 3.3 x 10<sup>6</sup> atoms/L to 884 x 10<sup>6</sup> atoms/L and the isotope ratio (<sup>129</sup>I/<sup>127</sup>I) in human urine ranged from 7.38 x 10<sup>-12 </sup>to 3.97 x 10<sup>-10 </sup>with a median of 1.29 x 10<sup>-10</sup>. This new method will be useful for investigations into the sources of iodine in the human diet and their relative importance for iodine sufficiency. </p> <p> </p>

scholarly journals Cellulase Pretreatment on Mercerized Cotton to Enhance X-Linking, Self-cleaning, and Antibacterial Properties Using Nano TiO2/CA/BTCA: Statistical Approaches

2013 ◽  
Vol 8 (4) ◽  
pp. 155892501300800
Author(s):  
Ali Nazari ◽  
Majid Montazer ◽  
Navid Nasirizadeh ◽  
Behnam Namiranian
Keyword(s):  
Antibacterial Properties ◽  
Cotton Fabrics ◽  
Cross Linking ◽  
Gram Negative Bacteria ◽  
Nano Tio2 ◽  
Self Cleaning ◽  
Pre Treatment ◽  
Escherichia Coli Bacteria ◽  
Recovery Angle ◽  
Fabric Surface

In this study, cellulase pre-treated mercerized cotton (EMC) fabrics were treated with citric acid (CA), butane tetra carboxylic acid (BTCA) and nano TiO2 (NTO) to produce fabric with enhanced cross-linking, self-cleaning, and antibacterial properties. However treatment of EMC fabrics with NTO/CA/BTCA has not been reported. The NTO particles were stabilized on the cotton surface using CA/BTCA cross-linking agents. In order to create optimum dry crease recovery angle (DCRA), self-cleaning based on (ΔE*) and bacteria reduction against Gram-positive and Gram-negative bacteria, the appropriate models were obtained based on Design of Expert software. The roles of CA, BTCA and NTO concentrations in cross-linking, self-cleaning, and antibacterial properties of the EMC fabric were investigated using response surface methodology (RSM). Overall, the cellulase pre-treatment of the mercerized cotton fabrics improved the antibacterial activity against Staphylococcus aureus and Escherichia coli bacteria, and also enhanced DCRA and self-cleaning properties significantly as compared with control samples. Also, reflectance spectra analyses (200–400 nm) and Scanning Electron Microscopy (SEM) were employed to confirm the NTO particles on the EMC fabric surface.

Modification of Hemp Fabric with Endoglucanase and Acrylamide for Efficient Enhancing Dyeability of Natural Dyes

2012 ◽  
Vol 627 ◽  
pp. 221-224
Author(s):  
Hong Li ◽  
Rui Liu ◽  
Ying Chao Ji ◽  
Ying Wang ◽  
Qiu Hong Wang
Keyword(s):  
Graft Copolymer ◽  
Natural Dyes ◽  
Color Fastness ◽  
Fastness Properties ◽  
Pre Treatment ◽  
Fabric Surface ◽  
Hemp Fabric

This paper describes a method for enhancing the dyeability of hemp fabric modified with acrylamide, by pre-treating the fabric surface with endoglucanase. The enzymatic pre-treatment resulted in an increasing number of graft copolymer of hemp-acrylamide on hemp fabric. By pre-treating hemp fabric with cellulose enzyme followed modification with acrylamide and dyeing of acrylamide modified pre-mordanted substrate with various natural dyes produced much improved depth of shade and all-round color fastness properties.

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