共查询到20条相似文献，搜索用时 31 毫秒
1.
In this work, dopamine hydrochloride, an environmental friendly compound, was applied on polyester fabric through conventional simple impregnation method in alkaline solution (pH=8.5) at room temperature. In situ spontaneous oxidative polymerization of dopamine form polydopamine (PDA) along with aminolysis of polyester fabric surface. Also, a range of colored polyester fabric were successfully achieved by formation of polydopamine adhesive coating layer at different concentration of dopamine hydrochloride (0.001-4 g/l). Fourier transform infrared spectroscopy and field emission scanning electron microscopy showed deposition of polydopmaine on the polyester fabric surface. The modified colored polyester fabric showed reasonable durability against washing, rubbing and light. The treated polyester fabric with 2 g/l dopamine hydrochloride as optimum concentration indicated not only lower spreading time for water droplet and electrical resistance with higher tensile strength but also very good bactericidal activity against Staphylococcus aureus and Escherichia coli. 相似文献
2.
An oil/water separation cotton fabric with high separation efficiency has been successfully developed by combining mussel-inspired one-step copolymerization approach and Michael addition reaction. The cotton fabric was first coated with the adhesive polydopamine (PDA) film by simple immersion in an aqueous solution of dopamine at pH of 8.5. Then n-dodecyl mercaptan (NDM) was conjugated with PDA film through Michael addition reaction at ambient temperature. The chemical structure, surface topography, and surface wettability of the fabric were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy, and contact angle experiments, respectively. The results showed that as-prepared cotton fabric had highly hydrophobicity with the water contact angle of 145° and superoleophilicity with the oil contact angle of 0°. It exhibited desirable property of oil/water separation, and it had excellent potential to be used in practical applications and has created a new field for oil/water separation. 相似文献
3.
Stability in a low temperature environment is needed for a textile to be used as winter wear. This research was presented the characteristics of fabrics by double-thin-layered coating with and without phase change materials (PCM) and several nano-sized inorganic particles (N-particles). Silica, Ag, Zr, and carbon types of N-particles were used for investigating the N-particles effect. For the experimental method, the PCM and N-particles were coated consecutively in the wet and dry coating process, respectively. The N-particles on the surface of the coated fabrics were confirmed by energy dispersive spectroscopy (EDS), and after double-layer composite coating, the adhesion durability, water vapor permeability, water penetration resistance, DSC, thermographic photography, far infrared (FIR) emission effect, and the thermal insulation of the coated fabrics were tested for investigating the performances. Their compatibility and adhesion were superior when the add-on of N-particles was 10 %. From the DSC reproducibility results, we verified that the N-particles coated fabric preserved its thermal stability by absorbing latent heat. On the other hand, the FIR emission rate and energy of the Ag N-particle based sample were not better than the control sample. 相似文献
4.
Highly aligned ultrafine fibers of Poly (amide-co-imide) PAI (torlon)/Poly (trimellitic anhydride chloride-co-4, 4′-methylene dianiline) (PTACM) blends have been prepared by using mechano-electrospinning. Employing a mixed solvent system of DMSO and THF alongwith water coagulation bath as a medium, continuous fibers with improved mechanical properties have been obtained. The continuity of the fibers is strongly dependent on the solvent mixing ratio of DMSO and THF (6:4). Continuous fibers with the most uniform diameter are obtained when a 30 % of PAI and PTACM (1:1) resins by weight is used in the blending solution. The aligned fibers are further coated with silver nanoparticles using a one-step process by passing the electrospunned fibers through PEG solution and a silver precursor solution followed by reduction in a continuous process. The advantage of our method lies in a uniform silver coating on a single fiber that can be coated continuously on a larger length scale (～Km). The mechanical properties of these fibers are dramatically improved after their alignment. Better electrical conductivity is obtained for these fibers after they are coated with silver nanoparticles. The highly aligned silver decorated fibers utilizes a novel electroless continuous process using Polyethylene glycol (PEG), which shows good binding properties and can be used for various bio and electronic applications. 相似文献
5.
This paper reports the effect of microencapsulated phase change materials (MPCMs) and silicon carbide (SiC) by a direct composite
coating on outdoor winter fabrics by examining the changes in the mechanical and physical properties that occur before and
after the composite coating. Pretreated waterproof breathable nylon was coated with PCMs 20 wt% (20PCM) and PCMs 20 wt%/SiC
20 wt% (SC-20PCM). The far-infrared (FIR) emissivity was measured using a Fourier transform infrared spectroradiometer. The
cross-section morphology, mechanical properties and changes in pore size were examined by scanning electron microscopy (SEM),
a Kawabata evaluation system for fabrics (KES-F) and porometry, respectively. SEM revealed the successful embedding of MPCMs
and SiC into the coating layer. The KES-F system showed that the application of coating additives onto the fabrics made them
stiffer and slightly heavier but decreased their pore size. The FIR emissivity was only marginally improved from 0.88 to 0.9. 相似文献
6.
Nanoparticles (NPs) are gaining increasing attention for potential application in medicine; consequently, studying their interaction with cells is of central importance. We found that both ligand arrangement and composition on gold nanoparticles play a crucial role in their cellular internalization. In our previous investigation, we showed that 66-34OT nanoparticles coated with stripe-like domains of hydrophobic (octanethiol, OT, 34%) and hydrophilic (11-mercaptoundecane sulfonate, MUS, 66%) ligands permeated through the cellular lipid bilayer via passive diffusion, in addition to endo-/pino-cytosis. Here, we show an analysis of NP internalization by DC2.4, 3T3, and HeLa cells at two temperatures and multiple time points. We study four NPs that differ in their surface structures and ligand compositions and report on their cellular internalization by intracellular fluorescence quantification. Using confocal laser scanning microscopy we have found that all three cell types internalize the 66-34OT NPs more than particles coated only with MUS, or particles coated with a very similar coating but lacking any detectable ligand shell structure, or 'striped' particles but with a different composition (34-66OT) at multiple data points. 相似文献
7.
Choi Yee Foong Mohd Syahir Anwar Hamzah Saiful Izwan Abd Razak Syafiqah Saidin Nadirul Hasraf Mat Nayan 《Fibers and Polymers》2018,19(2):263-271
Dry bacterial cellulose nanofiber (BC) sheet coated with poly(lactic acid) (PLA) was developed and characterized towards acute wound healing applications. This new approach of PLA coating on BC revealed enhanced physical and antibacterial properties. Commercial BC sheets originated from the manufacturing of nata de coco jelly were dried and coated with the PLA at various concentrations of 2, 4, 6, 8, 10 and 12 % w/v for the purpose of improving the mechanical properties and followed by loading of antiseptic such as benzalkonium chloride (BAC). PLA has been proposed for the use of coating materials at a concentration of 8 %, the biocomposite sheet started exhibiting a low moisture uptake, prolonged swelling in simulated wound fluid solution and high tear (9.17 Nm2/kg) and burst indices (32.5 kPa·m2/g). The 8 % PLA coating revealed porous fiber-like morphology as observed under scanning electron microscope. Therapeutic loading capacity of the BC/8 PLA was substantially higher than the pristine BC. Furthermore strong antimicrobial activities against Staphylococcus aureaus and Escherichia coli were observed for the BC/8PLA biocomposite film. These reports were clearly suggestive of the fact that synthetic biodegradable polymers, such as PLA, may be exploited for the synergistic combination with BC for antimicrobial and acute wound management. This new and modified fiber source material could reduce the dependency on plant based cellulose for more demanding biomedical applications such as wound healing materials, vascular graft, cartilage replacement, drug delivery and tissue engineering. 相似文献
8.
Necla Yaman 《Fibers and Polymers》2009,10(4):413-418
Organic-inorganic hybrid coatings containing phosphoric acid (PA) bonded to the organic-inorganic network were prepared from
tetraethoxysilane (TEOS) using a sol-gel process. The effect of sol-gel phosphate-based flame retardant coating on polyacrylonitrile
fabric properties (flammability, stiffness, and strength) was investigated. Sample characterization of the coated samples
were investigated using differential thermal/thermogravimetric analysis (DTA/TGA), Fourier transform infrared spectroscopy
(FTIR), X-ray diffractometer (XRD), and scanning electron microscopy (SEM). The results showed that hybrid coating on the
polyacrylonitrile fabrics influenced fabric stiffness, strength, and flammability. And also, flammability of the coated samples
after washing cycles was investigated, and the flame retardancy properties of the samples after 10 repeated washings were
not completely lost. 相似文献
9.
Wool and alpaca fibers were coated with polypyrrole by vapor-phase polymerisation method. The changes in frictional and tensile
properties of the single fibers upon coating with the conductive polymer are presented. Coating a thin layer of polypyrrole
on the alpaca and wool fibers results in a significant reduction in the fiber coefficient of friction, as the conducting polymer
layer smooths the protruding edges of the fiber scales. It also reduces the directional friction effect of the fibers. Depending
on the type of fiber, the coating may slightly enhance the tensile properties of the coated fibers. 相似文献
10.
Multifunctional textiles have been widely investigated with antimicrobial, self-cleaning, UV-protective properties, etc. Especially
sol-gel coating doped with bioactive agents and special agents provides to produce multifunctional textiles. In this study,
dip-coating (pad-dry) and solvothermal (exhaustion) sol-gel processes were used for coating of cotton fabric with silica and
titania sols to achieve the properties mentioned above. A quaternary ammonium salt and silver salts as antimicrobial doping
agent were embedded in titania sols with or without silica. Antimicrobial properties against Staphylococcus aureus (S. aureus) of the coated fabrics were characterized. The effect of precursors, doping agents and different sol-gel processes were also
compared on performance properties of the fabric samples. 相似文献
11.
In this paper, antistatic PE/PP coated non-woven fabrics were prepared by the coating process of the antistatic finished PE films and PP non-woven fabrics using the heat pressing process of the hot melt adhesives. The antistatic finishing of polyethylene (PE) films and polypropylene (PP) non-woven fabrics were processed by one face foam finishing and dip-pad finishing process, respectively. The antistatic properties of PE/PP coated non-woven fabrics which were influenced by the antistatic finishing processes and the thickness of PE films were investigated. The static charges transmission mechanism of these coated non-woven fabrics was illustrated. The results revealed that the static charges were transferred and dissipated by forming the continuous conductive path and network between the film-adhesive and adhesive-fabric due to the hot melt adhesion and squeezing of the antistatic agents existing inside of of the non-woven fabrics matrix and on the film surface. The antistatic properties of coated non-woven fabrics were improved with the increasing of the antistatic agent concentration on the finishing solution. And the antistatic properties of PE films were greatly influenced by the film thickness, the thinner of PE films the much more obvious improvement of the film surface antistatic properties. The finishing process wouldn’t reduce the peeling strength of the coated non-woven fabrics. The antistatic properties of the PE/PP coated non-woven fabrics possessed high washing durability due to the crosslinking fixation effect of the hot melt adhesives which wouldn’t be weakened after several times washing. 相似文献
12.
Luciana C. Gomes Sara I. Faria Jesus Valcarcel Jos A. Vzquez Miguel A. Cerqueira Lorenzo Pastrana Ana I. Bourbon Filipe J. Mergulho 《Marine drugs》2021,19(7)
The growing requirement for sustainable processes has boosted the development of biodegradable plastic-based materials incorporating bioactive compounds obtained from waste, adding value to these products. Chitosan (Ch) is a biopolymer that can be obtained by deacetylation of chitin (found abundantly in waste from the fishery industry) and has valuable properties such as biocompatibility, biodegradability, antimicrobial activity, and easy film-forming ability. This study aimed to produce and characterize poly(lactic acid) (PLA) surfaces coated with β-chitosan and β-chitooligosaccharides from a Loligo opalescens pen with different molecular weights for application in the food industry. The PLA films with native and depolymerized Ch were functionalized through plasma oxygen treatment followed by dip-coating, and their physicochemical properties were assessed by Fourier-transform infrared spectroscopy, X-ray diffraction, water contact angle, and scanning electron microscopy. Their antimicrobial properties were assessed against Escherichia coli and Pseudomonas putida, where Ch-based surfaces reduced the number of biofilm viable, viable but nonculturable, and culturable cells by up to 73%, 74%, and 87%, respectively, compared to PLA. Biofilm growth inhibition was confirmed by confocal laser scanning microscopy. Results suggest that Ch films of higher molecular weight had higher antibiofilm activity under the food storage conditions mimicked in this work, contributing simultaneously to the reuse of marine waste. 相似文献
13.
14.
种衣剂添加芸苔素内酯预防玉米冷害药害试验分析 总被引：3，自引：1，他引：3
在11％福·戊种衣剂中添加不同浓度的0.1％芸苔素内酯(BR),对九单48和东单213进行包衣处理,利用智能光照培养箱和田间错期播种,检验不同包衣处理对低温冷害的防御能力.结果表明,人工控制温度条件下,九单48添加最佳剂量BR出苗率为92％,未添加BR处理出苗率仅为20％,未包衣(对照)出苗率为48％.东单213添加最佳剂量BR出苗率为90％,未添加BR处理出苗率为80％,未包衣(对照)出苗率为52％.田间错期第一批播种处理中,九单48添加BR比未添加出苗率高3.83个百分点;东单213添加BR比未添加出苗率高4.94个百分点.种衣剂中添加适量BR能够有效抵御冷害药害,提高出苗率. 相似文献
15.
Exfoliated graphite nanoplatelets (EGN) were successfully coated with a liquid rubber amine-terminated poly(butadiene-co-acrylonitrile) (ATBN) at various concentrations. The rubber-coated EGN was incorporated into epoxy resin at different contents. The result revealed that the impact toughness of EGN/epoxy composite was increased by about 18 % with increasing the ATBN coating concentration. The impact strength, the flexural and dynamic mechanical properties, and the thermo-dimensional stability of EGN/epoxy composites were simultaneously enhanced by the incorporation of 1 wt% EGN coated with 10 wt% ATBN rubber into epoxy, which turns out a very small amount of 0.1 wt% ATBN compared to the epoxy resin. 相似文献
16.
Young Seok Koo 《Fibers and Polymers》2001,2(3):148-152
Cotton yarns were coated with a polymer solution to hold surface fibers to the yarn body, which caused fiber-fly generation
during knitting process. The physical property of the coated yarn, especially a bending rigidity was investigated in order
to evaluate the performance of the coated yarn during knitting. SEM images showing the surface condition of the coated yarn
demonstrated that the thickness of a coating material increased as the concentration of the coating solution increased. The
results of the bending rigidity measured using KES-FB2 system showed that the bending rigidity of the coated yarn increased
as the concentration of the coating solution increased. The results also revealed the possibility that yarn coated with a
low amount of coating material should be employed for further research of reducing fiber-fly generation during knitting process. 相似文献
17.
Development of efficient and eco-friendly sorbents used for selective oil removal after oil spill disasters is one of the main topics in environmental science. By using various cellulosic materials coated with graphene flakes, using simple, one-step dip-coating method, it was possible to manufacture environmentally friendly, selective oil sorbents. The cellulosic materials of different yarn size and distribution such as cotton roving, gauze, fabric, and cellulosic wipe and Whatman filter paper were chosen. The scanning electron microscopy showed that simple dip-coating of any cellulosic materials into graphene dispersion creates a uniformly distributed nanomaterial coating. The wetting tests confirmed that the coating endowed cellulosic materials with hydrophobic properties, regardless of their initial yarn distribution and purity. Moreover, the water repellent samples were simultaneously highly sorptive towards oils and organic solvents. Sorption tests performed for a representative group of organic solvents and oils have shown that depending on cellulosic material the oil sorption capacity varied from 4 g/g to 33 g/g for cotton fabric and roving, respectively. Moreover, the absorption selectivity of chloroform versus water exceeded 90 % for each sample and reached over 99 % for the graphene coated cotton roving and gauze. Finally, the recyclability tests have shown that graphene coated materials are less fragile for reuse than naturally hydrophobic sorbents. 相似文献
18.
Interest in industrial and domestic applications of biodegradable plastics from renewable sources is increasing, but their use in agriculture is still limited (e.g., mulching films, plant pots, and plant clips). However, a sprayable liquid bioplastic formulation was recently evaluated for application of microbial biocontrol agents to agricultural and horticultural crops. In this study bioplastic formulation has been evaluated for use in film-coating seeds of two agronomic species, corn and canola. Bioplastic seed coating was achieved using procedures and equipment designed for commercial polymer film-coating of tablets. Germination of both species was unaffected by the thin bioplastic coating. Bioplastic coatings containing spores of the plant-growth promoting fungus, Trichoderma harzianum, significantly stimulated the growth of corn and canola seeds. In corn seedlings, shoot and root lengths were 29% and 44% longer, respectively, in seeds coated with T. harzianum-containing bioplastic than in uncoated seeds. Similarly, in canola seedlings shoot and root lengths were 19% and 20% longer, respectively, in seeds coated with T. harzianum-containing bioplastic than in uncoated seeds. In a paper-roll assay, including T. harzianum spores prevented reduced germination caused by a mixture of the insecticide imidacloprid and the fungicide metalaxyl-M in bioplastic seed coatings. The adhesive and plastic properties of bioplastic reduced dust-off from bioplastic-coated seeds by 96% in corn and 99% in canola compared to seeds coated with a commercial polymer. 相似文献
19.
Mei-Chen Lin Ching-Wen Lou Ting An Lin Yueh-Sheng Chen Jia-Horng Lin 《Fibers and Polymers》2018,19(8):1596-1604
This study aims to develop biodegradable vascular stents that prevent permanent damage caused by rejection of the immune system of the human body. Polyvinyl alcohol (PVA) yarns are twisted to enhance their strength. The twisted yarns are braided and then coated with chitosan (CS). The CS-coated PVA vascular stents are chemically crosslinked with genipin (GP) to improve their flexibility and biodegradability. Their morphological characteristics are also observed using a stereoscopic microscope, and their properties are evaluated through scanning electron microscopy, Fourier transform infrared, bending test, biodegradability test, drug release measurement, and MTT assay. Results reveal that wet PVA-CS-GP vascular stents coated with multiple CS layers can maintain a tubular structure when they are bent. After crosslinking is performed, the compressive strength of the PVA-CS-GP stents is 17.04 times higher than that of pure PVA. The weight loss rate of the PVA-CS-GP vascular stents as <3 % after 30 days. The PVA-CS-GP vascular stents composed of 0.10 % heparin sodium show a good drug release effect. Biological activity test indicates that these stents exhibit good proliferation, and our structural model verifies that they are good vascular stents. 相似文献
20.
Maria Cristina Straccia Giovanna Gomez d’Ayala Ida Romano Adriana Oliva Paola Laurienzo 《Marine drugs》2015,13(5):2890-2908
In this work, a coating of chitosan onto alginate hydrogels was realized using the water-soluble hydrochloride form of chitosan (CH-Cl), with the dual purpose of imparting antibacterial activity and delaying the release of hydrophilic molecules from the alginate matrix. Alginate hydrogels with different calcium contents were prepared by the internal setting method and coated by immersion in a CH-Cl solution. Structural analysis by cryo-scanning electron microscopy was carried out to highlight morphological alterations due to the coating layer. Tests in vitro with human mesenchymal stromal cells (MSC) were assessed to check the absence of toxicity of CH-Cl. Swelling, stability in physiological solution and release characteristics using rhodamine B as the hydrophilic model drug were compared to those of relative uncoated hydrogels. Finally, antibacterial activity against Escherichia coli was tested. Results show that alginate hydrogels coated with chitosan hydrochloride described here can be proposed as a novel medicated dressing by associating intrinsic antimicrobial activity with improved sustained release characteristics. 相似文献