Plasma Modification of Kapok Fiber and its Properties

2013 ◽  
Vol 821-822 ◽  
pp. 18-22
Author(s):  
Tao Jiang ◽  
Ying Ding ◽  
Yong Shen
Keyword(s):  
Development Process ◽  
New Technologies ◽  
Natural Fibers ◽  
Hollow Structure ◽  
Fiber Surface ◽  
Processing Technique ◽  
Plasma Modification ◽  
Water Repellent ◽  
Kapok Fiber ◽  
Dyeing Rate

Kapok fiber has a unique large thin-walled hollow structure, lightweight and water repellent oil of excellent features, and is not yet fully exploited the small breed natural fibers. In the development process of the use of kapok fiber, there is a problem of dyeing, finishing, dyeing rate, dyeing and poor. Plasma processing technique is a modification to the fiber surface, non-polluting promising new technologies and has energy efficient. The research kapok fiber after plasma surface modification, found kapok modified staining rate has been significantly improved absorbent; Modified kapok fiber mechanical properties are not changed significantly; While exploring the plasma modified kapok fiber optimum.

scholarly journals Catalogue of hazards: a fundamental part for the safe design of surgical robots

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Lukas Theisgen ◽  
Florian Strauch ◽  
Matías de la Fuente ◽  
Klaus Radermacher
Keyword(s):  
Development Process ◽  
New Technologies ◽  
State Of The Art ◽  
Hazard Identification ◽  
Surgical Robots ◽  
Safety Measures ◽  
Fundamental Part ◽  
Phases Of Development ◽  
Early Phases ◽  
Intended Use

AbstractRisk classes defined by MDR and FDA for state-of-the-art surgical robots based on their intended use are not suitable as indicators for their hazard potential. While there is a lack of safety regulation for an increasing degree of automation as well as the degree of invasiveness into the patient’s body, adverse events have increased in the last decade. Thus, an outright identification of hazards as part of the risk analysis over the complete development process and life cycle of a surgical robot is crucial, especially when introducing new technologies. For this reason, we present a comprehensive approach for hazard identification in early phases of development. With this multi-perspective approach, the number of hazards identified can be increased. Furthermore, a generic catalogue of hazards for surgical robots has been established by categorising the results. The catalogue serves as a data pool for risk analyses and holds the potential to reduce hazards through safety measures already in the design process before becoming risks for the patient.

Study on Thermal, Thermo-Mechanical, and Flexural Properties of Jute Fiber Surface Modification and Its Reinforced Composite

2021 ◽  
Vol 8 (5) ◽  
pp. 11-17
Author(s):  
Syed Rashedul Islam ◽  
Abeer Alassod ◽  
Mohammed Kayes Patoary ◽  
Tayyab Naveed ◽  
Md Arshad Ali ◽  
...  
Keyword(s):  
Natural Fiber ◽  
Natural Fibers ◽  
Fiber Surface ◽  
Jute Fiber ◽  
Flexural Properties ◽  
Reinforced Composites ◽  
Acid Pretreatment ◽  
Chemical Treatments ◽  
Jute Fibers ◽  
Composite Properties

In recent years, reinforced composites from biodegradable and natural fibers have a worldwide scope for advanced applications. However, the core limitation of natural fiber reinforced composites are poor consistency among supporting fibers and the matrix. Therefore, optimal structural performance of fibers and matrix is desirable. In this study, chemical treatments (i.e., alkali pretreatment, acid pretreatment, and scouring) were applied to jute fibers for improvement of composite properties. Thermal, thermo-mechanical, and flexural properties, and surface morphology, of untreated and treated jute fibers were studied on the treated fibers. Jute fiber/epoxy composite properties were analyzed by thermogravimetric analysis (TGA), flexural strength and modulus, and dynamic mechanical analysis (DMA). The chemical treatments had a significant impact on the properties of jute fiber composites.

scholarly journals Adsorption Performance of Human-like Collagen by Alkali-modified Kapok Fiber: A Kinetic, Equilibrium, and Mechanistic Investigation

2021 ◽  
Author(s):  
Liyao Cao ◽  
Hongchang Wang ◽  
Hua Shen ◽  
ruiliu Wang ◽  
Fumei Wang ◽  
...  
Keyword(s):  
Fiber Surface ◽  
Alkali Concentration ◽  
Composition Analysis ◽  
Order Kinetic ◽  
Water Contact ◽  
Kapok Fiber ◽  
Mechanistic Investigation ◽  
Cavity Structure ◽  
Hollow Cavity ◽  
Adsorption Amount

Abstract Collagen-based dressings achieve excellent repair of the skin during metical cosmetology, which has received a lot of attention recently. Although great progress has been made on using biomass fiber as dressing carrier, more research is required on developing novel biomass fibers because of the limitations of (i.e., high cost and complex processing) of existing materials. In this study, the adsorption behaviors of two human-like collagen were studied by examining the Kapok fiber that was modified using alkali consisting of various amounts of the mass fraction. Results show that the alkali-modified Kapok fiber surface becomes rough with vertically arranged grooves, and the cross-section depicts the hollow cavity structure. The composition analysis of alkali modified Kapok shows that alkali dissolves part of the hemicellulose and lignin. Additionally, the surface energy rises sharply and the water contact angle changed from hydrophobic to hydrophilic. The adsorption amount of raw Kapok fiber is around 0.6g/g, which accounts for only one twenty-first of the adsorption amount of alkali-treated Kapok (around 12.6g/g), while the equilibrium adsorption amount was not sensitive to alkali concentration. The kinetics of human-like collagen followed both Quasi first and Quasi second order kinetic model, implying that the adsorption process where characterized by both physisorption and chemisorption. Finally, characterization of the AKF-2 coupled with the studies based on the inter-particle diffusion model showed a three-step of human-like collagen diffusion consisting of surface diffusion, inter-fiber diffusion and fiber' hollow cavity diffusion. Our results demonstrate a perfect high absorption performance of Kapok fiber providing a potential for application of collagen-base dressings.

Study on the Structure and Performances of Kapok Textiles

2012 ◽  
Vol 573-574 ◽  
pp. 167-173
Author(s):  
Li Qin Lou
Keyword(s):  
Cross Section ◽  
Cotton Fiber ◽  
Hollow Structure ◽  
Alkali Resistance ◽  
Kapok Fiber ◽  
Dyeing Property ◽  
Weave Structure ◽  
Colored Cotton ◽  
White Cotton ◽  
Warmth Retention

Kapok fiber has many excellent Performances. the surface and cross section of the kapok fiber were observed. These performances of the distribution of length and fineness, moisture regain, acid and alkali properties, and dyeing property were tested and compared for the kapok fiber, colored cotton fiber and white cotton fiber. The fabrics of same weave structure paramater were developed and the warmth retention property wewe tested. The results show that the surface of the kapok fiber is smooth，Cross section of the kapok fiber is round with hollow-structure. The length and fineness of the kapok fiber was lower than white cotton fiber and colored cotton fiber. The hygroscopicity and moisture guide properties of the kapok fiber was better than white cotton fiber and colored cotton fiber, the dyeing property of the kapok fiber was worse than white cotton fiber, the kapok fiber is alkali-resistance and non acid-resistant. The fabrics of the kapok fiber has better warmth retention property.

Metaplexis japonicaseed hair fiber: a member of natural hollow fibers and its characterization

2019 ◽  
Vol 89 (21-22) ◽  
pp. 4363-4372 ◽  
Author(s):  
Zongqian Wang ◽  
Dengfeng Wang ◽  
Mingrong Wang ◽  
Wei Li ◽  
Qing Sui
Keyword(s):  
Length Distribution ◽  
Hollow Structure ◽  
Fiber Surface ◽  
Surface Characteristics ◽  
Extensive Study ◽  
Research Literature ◽  
Retention Performance ◽  
Fiber Morphology ◽  
Surface Absorption ◽  
Fiber Wall

Metaplexis japonica seed hair fibers (Mj-fiber), harvested from the seed pods of Metaplexis japonica (Apocynaceae: Asclepiadoideae) originating in China, Japan and Korea, have features ensuring its potential application in the textile and other industrial fields. In spite of the extensive study on the medicinal properties of Metaplexis japonica, research literature about Mj-fiber is quite limited. We obtained Mj-fibers by artificial peeling and seed removing; then the fiber morphology, chemical composition, structures, fiber surface absorption characteristics, and tensile and thermal properties were studied in detail. From the results, Mj-fiber has a hollow structure with a thin fiber wall and large lumen, in which the hollowness is over 92%. Uniquely, Mj-fiber is a natural profiled fiber with a cross-section of a "cross flower" morphology. At the same time, the density of it is very low, accounting for only one-fifth of the cotton fibers, and the fiber length distribution is relatively concentrated. The main component is cellulose, with a content of 53.9 ± 3.20% and structure of cellulose I. In particular, Mj-fiber has excellent hydrophobic and oil affinity surface characteristics. Moreover, the fibers bulkiness and warmth retention performance are comparable to that of duck down. Therefore, the results provide an experimental basis for the application of Mj-fibers in the textile and other industrial fields.

Effects of Fiber Surface Treatments on the Moisture Absorption and Interfacial Properties of Natural Fibers and their Composites

2009 ◽  
Vol 610-613 ◽  
pp. 728-733 ◽  
Author(s):  
Yan Li ◽  
Feng Lv ◽  
Hong Xia Deng ◽  
Ronald Kollmansberger ◽  
Shan Ying Zeng
Keyword(s):  
Environmental Temperature ◽  
Moisture Absorption ◽  
Natural Fibers ◽  
Fiber Surface ◽  
Interfacial Properties ◽  
Surface Treatments ◽  
Pull Out ◽  
Short Beam ◽  
Beam Shear ◽  
Interlaminar Shear

Interfacial properties of four kinds of natural fibers (et. ramie, jute, sisal and kenaf) reinforced phenolic resin were studied by single fiber pull-out test and short beam shear test. Effect of fiber surface treatments on the interfacial properties was evaluated. It showed that interlaminar shear strength (IFSS) was considerably improved after fiber surface treatments, especially after the silane treatment. Concerns about the poor moisture resistance of natural fibers, effects of fiber surface treatments on the moisture absorption behavior of natural fibers were also investigated by gravimetric methods. The results showed that neither fiber surface treatments nor the environmental temperature has effect on the moisture absorption behavior of natural fibers.

Tensile Strength of Surface Treated PBO Fiber

2015 ◽  
Vol 815 ◽  
pp. 622-628 ◽  
Author(s):  
Gang Shi ◽  
Su Ju ◽  
Chun Fang Huang ◽  
Da Zhi Jiang ◽  
Jian Wei Zhang
Keyword(s):  
Tensile Strength ◽  
High Performance ◽  
Fiber Surface ◽  
Interface Energy ◽  
Plasma Modification ◽  
Interface Properties ◽  
Weibull Analysis ◽  
Combined Treatments ◽  
Pbo Fiber ◽  
The Individual

Poly p-phenylene benzobisoxazole (PBO) fiber is a kind of organic fiber with high performance, but the properties of the interface between PBO fiber and resin are poor, which limit its application in the field of composite materials. Therefore, the surface modification methods were employed to enhance the interface properties, which could damage the fiber. This article assessed the influence of plasma modification, γ-ray irradiation, coupling agent, acid treatment and combined treatments on the strength of PBO fiber filament, and investigated its tensile strength with Weibull analysis. Through observation of fiber surface by SEM，it can be found that some combined treatments caused less damage to PBO fiber compared to the individual treatments. This indicates that if combining the different treatments appropriately, the interface energy of PBO fiber will increase, with the excellent mechanical properties well retained

scholarly journals Computationel tankegang fra et pædagogisk perspektiv

2021 ◽  
Vol 5 (1) ◽  
pp. 14
Author(s):  
Camilla Finsterbach Kaup
Keyword(s):  
Development Process ◽  
New Technologies ◽  
Computational Thinking ◽  
Digital Technologies ◽  
Mathematical Understanding ◽  
Second Grade ◽  
Teaching Context ◽  
The Social ◽  
Internalization Process ◽  
Math Teacher

ResuméDenne artikel beskriver en undersøgelse af skolepædagogens betydning, når der introduceres til nye digitale teknologier i en undervisningssammenhæng i samarbejde med matematiklæreren. Undersøgelsen belyser, hvordan pædagogen kan være med til at understøtte elevernes tilegnelse af computationel tankegang (CT) som en del af matematikundervisningen. I projektet er der til hver klasse tilknyttet et team bestående af en pædagog og en matematiklærer. Empiriindsamlingen er en del af et ph.d.-projekt med fokus på CT i matematik, hvor der ses på, hvordan klasseteamet kollektivt kan udvikle brugen af CT for at understøtte elevernes matematiske forståelse. I denne artikel indgår der datamateriale i form af observationer fra det pædagogiske personales (pædagog og matematiklærer) undervisning og kompetenceudviklingsproces fra i alt fem 2. klasser fra tre forskellige kommuner. Resultaterne viser, at pædagogen spiller en væsentlig rolle i forhold til at understøtte elevernes internaliseringsproces, når der inddrages nye teknologier i undervisningen, og der er en opfattelse af, at pædagogerne fungerer som et medierende led i elevernes tilegnelse af den computationelle og matematiske forståelse. Det er vigtigt, at pædagogerne kender til de valgte teknologier og selv har afprøvet disse i praksis, da det giver dem større tryghed, når de understøtter både læreren og eleverne i undervisningen. Abstract Computational thinking from a pedagogical perspective. The social educator’s importance for introducing technology in mathematics education. This article describes research on the importance of the social educator when new digital technologies are introduced in a teaching context along with the math teacher. It explores how the social educator can facilitate students’ acquisition of computational thinking (CT) as part of mathematics. For the project, each class is assigned a team that consists of a social educator and a math teacher. This article is part of a larger project that addresses CT in mathematics, which focuses on how to develop the use of CT to support the students’ mathematical understanding. Moreover, this article includes data material such as observations from the teaching and collective professional development process of the pedagogical staff from five second grade classes from three different municipalities. The results reveal that the social educator has a significant role in supporting students’ internalization process when new technologies are incorporated into the teaching. The social educator is also considered a mediating element in the students’ acquisition of computational and mathematical understanding. It is essential that the social educator is familiar with the selected technologies and has tested them in practice since this experience will increase their confidence in supporting the teacher and the students in the teaching.

scholarly journals Treatment of Natural Fiber for Application in Concrete Pavement

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Anteneh Geremew ◽  
Pieter De Winne ◽  
Tamene Adugna Demissie ◽  
Hans De Backer
Keyword(s):  
Natural Fiber ◽  
Low Cost ◽  
Natural Fibers ◽  
Specific Treatment ◽  
Fiber Surface ◽  
Drying Shrinkage ◽  
Concrete Technology ◽  
Treatment Techniques ◽  
Concrete Crack ◽  
Concrete Production

Concrete crack is one of the main problems observed in concrete technology due to drying shrinkage. Incorporating fibers in concrete production is one of the mechanisms implemented to mitigate cracks. Nowadays, investigators concentrate on different techniques to replace human-made fiber with existing natural fibers for fiber-reinforced composite material. Utilization of natural fiber has an initiation for the development of eco-friendly materials by reducing damages caused by human-made materials and saving nonrenewable resources. Natural fibers are readily and abundantly available, sustainable, and biodegradable, with low cost and low density, and have superior specific properties. Nevertheless, there are some limitations of natural fiber compared to human-made fiber. Consequently, significant energy was applied to alter natural fiber’s surface and morphology using physical, chemical, and biological treatment techniques to overcome the limitation. The primary intention of surface treatment is to modify the bond between the fiber surface and the polymer matrix. However, based on this literature review, there were no specific treatment techniques to be followed to select the best one from the others as criteria. It should include all parameters to consider starting from the stage from the cradle to the grave, cost of chemicals, transportation, and labors, including energy consumption and effluent energy. Additionally, their environmental effect also investigated in detail to compare each other.

Sign in / Sign up

Export Citation Format

Share Document