Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Applying of Fuzzy Logic Interface in Nylon Fiber Production
Frontiers in Science , 2012, DOI: 10.5923/j.fs.20120206.07
Abstract: The nylon fiber by its high strength and modulus is becomes a potential option for many applications like general technical textile, high performance uses, nanotechnology material as a reinforced composite formulation and nanocrisper. The production of nylon fiber can be easily predicted and perform at an accurate level of energy saving with the help of using fuzzy logic interface. The circulation of hot/cold oil flow which has normally used as the fuel to increase the temperature of the nylon fiber reactor can be precisely checked by fuzzy logic data. The pressure and temperature of the reactor can be also controlled by this process of adding fuzzy intelligence or simulation in the chamber of the nylon fiber production reactor.
Nylon/Graphene Oxide Electrospun Composite Coating  [PDF]
Carmina Menchaca-Campos,César García-Pérez,Iván Casta?eda,Miguel A. García-Sánchez,René Guardián,Jorge Uruchurtu
International Journal of Polymer Science , 2013, DOI: 10.1155/2013/621618
Abstract: Graphite oxide is obtained by treating graphite with strong oxidizers. The bulk material disperses in basic solutions yielding graphene oxide. Starting from exfoliated graphite, different treatments were tested to obtain the best graphite oxide conditions, including calcination for two hours at 700°C and ultrasonic agitation in acidic, basic, or peroxide solutions. Bulk particles floating in the solution were filtered, rinsed, and dried. The graphene oxide obtained was characterized under SEM and FTIR techniques. On the other hand, nylon 6-6 has excellent mechanical resistance due to the mutual attraction of its long chains. To take advantage of the properties of both materials, they were combined as a hybrid material. Electrochemical cells were prepared using porous silica as supporting electrode of the electrospun nylon/graphene oxide films for electrochemical testing. Polarization curves were performed to determine the oxidation/reduction potentials under different acidic, alkaline, and peroxide solutions. The oxidation condition was obtained in KOH and the reduction in H2SO4 solutions. Potentiostatic oxidation and reduction curves were applied to further oxidize carbon species and then reduced them, forming the nylon 6-6/functionalized graphene oxide composite coating. Electrochemical impedance measurements were performed to evaluate the coating electrochemical resistance and compared to the silica or nylon samples. 1. Introduction Graphite oxide is a compound of carbon, oxygen, and hydrogen in variable ratios, commonly obtained by treating graphite with strong oxidizers. Strictly speaking “oxide” is an incorrect but historically established name, since graphite is not a metal. The bulk material disperses in basic solutions yielding monomolecular sheets, known as graphene oxide by analogy to graphene, the single-layer form of graphite [1]. Graphene oxide (GO) sheets have recently attracted substantial interest as a possible intermediate for the manufacture of graphene. It typically preserves the layer structure of the parent graphite, but the layers are buckled and the interlayer spacing is about two times larger (~0.7?nm) than that of graphite. Graphene oxide layers are about ?nm thick [2–6]. The edges of each layer are terminated with carboxyl and carbonyl groups. The detailed structure is still not understood due to the strong disorder and irregular packing of the layers [1]. One of the methods used to separate the layers of graphite consists in an aggressive oxidative processes which functionalize the periphery and some places of the graphene
Determination of Mechanical Properties of Hybrid Steel-Nylon Fiber Reinforced Concrete  [cached]
Mazin Burhan Adeen,Alya'a Abbas Al-Attar,Sa'ad Mahmoud Ra'ouf
Modern Applied Science , 2010, DOI: 10.5539/mas.v4n12p97
Abstract: This study aims to characterize and quantify the mechanical properties of hybrid steel-nylon fiber reinforced concrete. In order to achieve and verify that, 0.5%, 1% and 1.5% fiber percentage by volume of concrete are used in this study with five different mixes of 100-0%, 70-30%, 50-50%, 30-70% and 0-100% for each fibers percentage (nylon to steel). 28-day compressive strength, split tensile strength and modulus of rupture (MOR) tests have been performed in the hardened state. The total tested specimen are 144 specimens. Superplsticizer and silica fume are used in all the mixes to enhance the FRC mechanical properties. When compared to the control sample that contains no fibers, with the increase of fiber ratio, compression strength, split-tensile strength and flexural strength of concrete increase up to 242%, 182% and 181% respectively. The result showed that the steel fibers improve the concrete properties better than the nylon fiber due to their higher tensile strength.

ZENG Han-min,KONG Bai-ling,

高分子学报 , 1989,
Abstract: In this work, carbon fiber/nylon-1010 interfacial morphologies have been investigated by hot stage microscopy for single fibers embedded in nylon-1010 matrix. Results show that the ability for carbon fiber to cause nucleation of nylon-1010 producing transcrystallinity around fibers depends on the type of carbon fiber used and the highmodulus carbon fiber (M40) is more effective at nucleating nylon-1010 compared with the high-or middle-strength carbon fibers. The interfacial morphologies may be strongly influenced by the temperature and time of crystallization. The origins of these effects are also discussed.
Obstruction of Photoinduced Electron Transfer from Excited Porphyrin to Graphene Oxide: A Fluorescence Turn-On Sensing Platform for Iron (III) Ions  [PDF]
Zhong De Liu, Heng Xin Zhao, Cheng Zhi Huang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0050367
Abstract: A comparative reaserch of the assembly of different porphyrin molecules on graphene oxide (GO) and reduced graphene oxide (RGO) was carried out, respectively. Despite the cationic porphyrin molecules can be assembled onto the surfaces of graphene sheets, including GO and RGO, to form complexes through electrostatic and π-π stacking interactions, the more obvious fluorescence quenching and the larger red-shift of the Soret band of porphyrin molecule in RGO-bound states were observed than those in GO-bound states, due to the differenc of molecular flattening in degree. Further, more interesting finding was that the complexes formed between cationic porphyrin and GO, rather than RGO sheets, can facilitate the incorporation of iron (III) ions into the porphyrin moieties, due to the presence of the oxygen-contained groups at the basal plane of GO sheets served as auxiliary coordination units, which can high-efficiently obstruct the electron transfer from excited porphyrin to GO sheets and result in the occurrence of fluorescence restoration. Thus, a fluorescence sensing platform has been developed for iron (III) ions detection in this contribution by using the porphyrin/GO nanohybrids as an optical probe, and our present one exhibited rapid and sensitive responses and high selectivity toward iron (III) ions.

LIN Wei-ping,LU Yun,ZENG Han-min,

高分子学报 , 1993,
Abstract: The structure of the nylon 6 fiber irradiated by 7-ray was analyzed. The results show that during the irradiation process the molecular chain is degradated, the crystallinity increases , while the crystalline orientation dose hot change.
"The blood pressure and dermal sensitivity effects of Nylon hollow fiber releasing Glycerin Trinitrate in vivo "
"Ostad SN,Farhad Khani M,Minaei B,Malihi G
DARU : Journal of Pharmaceutical Sciences , 2002,
Abstract: In order to improve patient's compliance in taking glycerine trinitrate (GTN) nylon hollow fiber which has been successfully used for release of chlorhexidine diacetate and levonorgestrel was employed to make nylon hollow fiber releasing GTN. Hollow nylon fibres of external diameter 0.63 mm, 75 mm long with an internal capacity of 16 μl, were filled with GTN (190 mg/ml) in 70% ethanol (v/v) or vehicle alone and the ends were heat-sealed. The fibers were then immersed in 10 ml of 0.9% (w/v) saline in a separating funnel. The GTN release pattern from fiber, the effect of the product on blood pressure and its potential dermal toxicity were assessed. The release of GTN from the fibres was approximately 2.7 μg/min when the fibres contained 16 mg of drug. The results showed that the amount of GTN within the single fibre was enough to reduce blood pressure significantly, while it did not show significant dermal toxicity. It is concluded that GTN fiber, if used as monofilament, is not an alternative method for GTN delivery.
Carbon-Coated-Nylon-Fiber-Reinforced Cement Composites as an Intrinsically Smart Concrete for Damage Assessment during Dynamic Loading
Zhenjun ZHOU,Zhiguo XIAO,Wei PAN,Zhipeng XIE,Xixian LUO,Lei JIN,

材料科学技术学报 , 2003,
Abstract: Concrete containing short carbon-coated-nylon fibers (0.4-2.0 vol. pct) exhibited quasi-ductile response by developing a large damage zone prior to fracture localization. In the damage zone, the material was microcracked but continued to local strain-harden. The carbon-coated-nylon-fiber-reinforced concrete composites (NFRC) were found to be an intrinsically smart concrete that could sense elastic and inelastic deformation, as well as fracture. The fibers served to bridge the cracks and the carbon coating gave the conduction path. The signal provided came from the change in electrical resistance, which was reversible for elastic deformation and irreversible for inelastic deformation and fracture. The resistance decrease was due to the reduction of surface touch resistance between fiber and matrix and the crack closure. The resistance irreversible increase resulted from the crack opening and breakage of the carbon coating on nylon fiber.
Enhanced Nonlinear Absorption Performance of Reduced Graphene Oxide Nanohybrid Covalently Functionalized by Porphyrin via 1,3-Dipolar Cycloaddition  [PDF]
Nan Zhang, Xiaoqing Cong
Materials Sciences and Applications (MSA) , 2018, DOI: 10.4236/msa.2018.912070
Abstract: Porphyrin-functionalized reduced graphene oxide (RGO-TPP) was prepared by 1,3-dipolar cycloaddition reaction and characterized by Fourier transform infrared spectroscopy, Raman, ultraviolet/visible absorption, fluorescence, and transmission electron microscopy. At the same level of linear transmittance, RGO-TPP exhibited more enhanced optical nonlinearities than RGO and the pristineporphyrin, implying a remarkable accumulation effect as a result of the covalent link between RGO and porphyrin. The role of energy/electron transfer in the optical nonlinearities of RGO-TPP was investigated by fluorescence and Raman spectroscopy. All the results displayed that RGO can be covalently functionalized with porphyrins by the proposed approach.
Electrospinning and Porosity Measurements of Nylon-6/Poly(ethylene oxide) Blended Nonwovens  [PDF]
Margaret W. Frey, Ph.D.,Lei Li, Ph.D.
Journal of Engineered Fibers and Fabrics , 2007,
Abstract: A simple method was used to prepare a nonwoven fabric of intimately co-mingled Nylon-6 and Polyethylene oxide (PEO) electrospun fibers by spinning fibers onto a rotating collector. Electrospinning parameters for each polymer were independent. Fiber mixture and distribution was uniform throughout the depth of the fabric. Porosity and pore size distribution of the materials were measured before and after a washing treatment. The PEO component was removed during the washing step to create increased pore size in the remaining fabric. This study indicates a simple method to create nanofiber nonwovens of multiple dissimilar polymers and provides a strategy for controlling pore size distribution independently from fiber formation.
Page 1 /100
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.