scholarly journals Fabrication of Flexible Agnws/Cellulose Hybrid Film with Heat Preservation and Antibacterial Properties for Agriculture Application

2021 ◽  
Author(s):  
Yu Chen ◽  
Shuanghong Yang ◽  
Zhiwei Qiu ◽  
Yuqi Li ◽  
Fengxian Qiu ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Hybrid Film ◽  
Supply Voltage ◽  
Silver Nanowires ◽  
Antibacterial Properties ◽  
Building Blocks ◽  
Electrical Heating ◽  
General Strategy ◽  
Hybrid Films ◽  
Agricultural Films

Abstract In the view of sustainable development and environment protection, degradable agricultural films with on-demand thermal insulation properties have attracted growing research interest in the last few decades due to the deteriorating environment and extreme climate on the growth and existence of crops. Here, a general strategy has been developed to fabricate degradable silver nanowires modified cellulose (AgNWs/cellulose) hybrid film with controllable thermal insulation and antibacterial properties by using plant cellulose and AgNWs as building blocks, as well as their agriculture application. The results showed that the AgNWs were evenly dispersed in the three-dimensional grid of cellulose, formed a film that could withstand a certain tensile force, and have good thermal stability. Due to the excellent electrical conductivity, the AgNWs/cellulose hybrid films can provide excellent Joule heating, generating rapid thermal response and uniform electrical heating at a low supply voltage of 3 V for extra warmth. In the antibacterial tests against Escherichia coli and Staphylococcus aureus, the AgNWs/cellulose hybrid film exhibit large diameters of inhibition zones, revealing the high antibacterial activity. Additionally, the AgNWs/cellulose hybrid films showed highly stretchable behavior by delivering a breaking strain of 1.5% with a tensile stress of 0.45 MPa owing to the cross-linked structures of cellulose and AgNWs. Based on the above properties, this study not only provides a potential strategy for the fabrication of flexible and biodegradable agricultural films but also may provide new insights for agricultural thermal management.

Fabrication of MnO2 nanowires@Ag/cellulose laminated membrane with unidirectional liquid penetration for personal thermal management applications

2021 ◽  
Author(s):  
Yongfang chen ◽  
Bin Gu ◽  
Yuqi Li ◽  
Dongya Yang ◽  
Fengxian Qiu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Thermal Management ◽  
Supply Voltage ◽  
Thermal Response ◽  
Building Blocks ◽  
Electrical Heating ◽  
Silver Coating ◽  
Liquid Penetration ◽  
Nano Coating ◽  
Cellulose Membranes

Abstract Controllable and reliable fabrication of wearable materials with tunable structures and integrated functionalities are urgently required for personal thermal management. Herein, this highlight presents the fabrication of MnO2 nanowires@Ag/cellulose laminated membrane with infrared insulation, antibacterial and unidirectional liquid penetration properties via orderly vacuum filtration of hydrophobic cellulose, hydrophilic cellulose and ultra-long MnO2 nanowires coated with silver (MnO2 nanowires@Ag). To do this, hydrophobic sugarcane cellulose was obtained by surface modification with silane coupling agent (A151), while hydrophilic sugarcane cellulose was obtained by HNO3 treatment. Silver coated MnO2 nanowires, as the building blocks of laminated membranes, were prepared by magnetron sputtering of silver nanoparticles onto the surfaces of MnO2 nanowires. The characterizations indicated that silver nano coating with high infrared radiation reflectivity and excellent electrical conductivity were successfully fabricated onto MnO2 nanowires surfaces, resulting in infrared insulation properties of the laminated cellulose membranes. In addition, the laminated membranes exhibit excellent unidirectional liquid penetration properties that can enhance the wearing comfort for the laminated cellulose membranes. In the antibacterial tests against Escherichia coli and Staphylococcus aureus, the laminated membranes exhibit large diameters of inhibition zones, revealing the high antibacterial activity. Moreover, excellent electrical conductivity of silver coating grants the superior Joule heating, generating rapid thermal response and uniform electrical heating at low supply voltage for extra warmth. These results indicate a promising potential of the laminated cellulose membranes for tackling personal thermal management issues related to wearable applications.

scholarly journals Ethylene-bridged polysilsesquioxane/hollow silica particle hybrid film for thermal insulation material

RSC Advances ◽  
2021 ◽  
Vol 11 (40) ◽  
pp. 24968-24975
Author(s):  
Satoru Tsukada ◽  
Yuki Nakanishi ◽  
Takashi Hamada ◽  
Kenta Okada ◽  
Susumu Mineoi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Insulation ◽  
Silica Particle ◽  
Hybrid Film ◽  
Sol Gel ◽  
Insulation Material ◽  
Hybrid Films ◽  
Hollow Silica ◽  
Bridged Polysilsesquioxane ◽  
Hollow Silica Particles

Ethylene-bridged polysilsesquioxane/hollow silica particle hybrid films were prepared by the sol–gel reaction. The hybrid film containing hollow silica particles exhibited good thermal insulation properties and thermal stability.

Ordered porous structure hybrid films generated by breath figures for directional water penetration

RSC Advances ◽  
2015 ◽  
Vol 5 (107) ◽  
pp. 88471-88476 ◽  
Author(s):  
Tianqi Guo ◽  
Keyu Han ◽  
Liping Heng ◽  
Moyuan Cao ◽  
Lei Jiang
Keyword(s):  
Porous Structure ◽  
Hybrid Film ◽  
Hybrid Films ◽  
Substrate Roughness ◽  
Water Penetration ◽  
Breath Figures ◽  
Ordered Porous

A highly ordered open-pore hybrid film was fabricated by controlling the substrate roughness and wettability. The composite with different wettability on the two side resulted in an attractive unidirectional water-penetration function (see figure).

scholarly journals Heat Scanning for the Fabrication of Conductive Fibers

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1405
Author(s):  
Jina Jang ◽  
Haoyu Zhou ◽  
Jungbae Lee ◽  
Hakgae Kim ◽  
Jung Bin In
Keyword(s):  
Silver Nanowires ◽  
Building Blocks ◽  
Dip Coating ◽  
Coating Materials ◽  
Scanning Time ◽  
Silver Ink ◽  
Nylon Fiber ◽  
Coating Method ◽  
Conductive Fibers ◽  
Tubular Heater

Conductive fibers are essential building blocks for implementing various functionalities in a textile platform that is highly conformable to mechanical deformation. In this study, two major techniques were developed to fabricate silver-deposited conductive fibers. First, a droplet-coating method was adopted to coat a nylon fiber with silver nanoparticles (AgNPs) and silver nanowires (AgNWs). While conventional dip coating uses a large ink pool and thus wastes coating materials, droplet-coating uses minimal quantities of silver ink by translating a small ink droplet along the nylon fiber. Secondly, the silver-deposited fiber was annealed by similarly translating a tubular heater along the fiber to induce sintering of the AgNPs and AgNWs. This heat-scanning motion avoids excessive heating and subsequent thermal damage to the nylon fiber. The effects of heat-scanning time and heater power on the fiber conductance were systematically investigated. A conductive fiber with a resistance as low as ~2.8 Ω/cm (0.25 Ω/sq) can be produced. Finally, it was demonstrated that the conductive fibers can be applied in force sensors and flexible interconnectors.

scholarly journals Physico-Chemical Characterization and Antimicrobial Properties of Hybrid Film Based on Saponite and Phloxine B

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 325
Author(s):  
Nitin Chandra teja Dadi ◽  
Matúš Dohál ◽  
Veronika Medvecká ◽  
Juraj Bujdák ◽  
Kamila Koči ◽  
...  
Keyword(s):  
Hybrid Film ◽  
Antimicrobial Properties ◽  
Chemical Characterization ◽  
Layered Silicate ◽  
Contact Angles ◽  
Exchange Capacity ◽  
Resistant Bacteria ◽  
Hybrid Films ◽  
Water Contact ◽  
Physico Chemical

This research was aimed at the preparation of a hybrid film based on a layered silicate saponite (Sap) with the immobilized photosensitizer phloxine B (PhB). Sap was selected because of its high cation exchange capacity, ability to exfoliate into nanolayers, and to modify different surfaces. The X-ray diffraction of the films confirmed the intercalation of both the surfactant and PhB molecules in the Sap film. The photosensitizer retained its photoactivity in the hybrid films, as shown by fluorescence spectra measurements. The water contact angles and the measurement of surface free energy demonstrated the hydrophilic nature of the hybrid films. Antimicrobial effectiveness, assessed by the photodynamic inactivation on hybrid films, was tested against a standard strain and against methicillin-resistant bacteria of Staphylococcus aureus (MRSA). One group of samples was irradiated (green LED light; 2.5 h) and compared to nonirradiated ones. S. aureus strains manifested a reduction in growth from 1-log10 to over 3-log10 compared to the control samples with Sap only, and defects in S. aureus cells were proven by scanning electron microscopy. The results proved the optimal photo-physical properties and anti-MRSA potential of this newly designed hybrid system that reflects recent progress in the modification of surfaces for various medical applications.

Practical mediated-assembly synthesis of silver nanowires using commercial Camellia sinensis extracts and their antibacterial properties

2018 ◽  
Vol 42 (3) ◽  
pp. 2133-2139 ◽  
Author(s):  
M. Flores-González ◽  
M. Talavera-Rojas ◽  
E. Soriano-Vargas ◽  
V. Rodríguez-González
Keyword(s):  
Phenolic Compound ◽  
Camellia Sinensis ◽  
Silver Nanowires ◽  
Antioxidant Properties ◽  
Antibacterial Properties

Camellia sinensis is a well-known plant used for health purposes due to its high phenolic compound content and antioxidant properties.

scholarly journals Chiral platinum–polypyrrole hybrid films as efficient enantioselective actuators

2019 ◽  
Vol 55 (73) ◽  
pp. 10956-10959 ◽  
Author(s):  
Sunpet Assavapanumat ◽  
Bhavana Gupta ◽  
Gerardo Salinas ◽  
Bertrand Goudeau ◽  
Chularat Wattanakit ◽  
...  
Keyword(s):  
Hybrid Film ◽  
Hybrid Films ◽  
Mesoporous Platinum

A hybrid film composed of chiral encoded mesoporous platinum and polypyrrole shows differential wireless actuation as a function of the chiral nature of an enantiomer present in solution.

scholarly journals Thermal insulation property of graphene/polymer coated textile based multi-layer fabric heating element with aramid fabric

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hyelim Kim ◽  
Han Seong Kim ◽  
Sunhee Lee
Keyword(s):  
Surface Temperature ◽  
Thermal Insulation ◽  
Temperature Difference ◽  
Protective Clothing ◽  
Woven Fabrics ◽  
Heating Element ◽  
Electrical Heating ◽  
High Porosity ◽  
Insulation Property ◽  
Thermal Insulation Property

Abstract This study investigated the thermal insulation properties based on electrical heating test of graphene-based multi-layer fabric heating elements to confirm the possibility of application for fabric heating element for protective clothing. Four layers were designed as layers of outer, filler, electrical heating textile, and lining. The outer fabrics used two different densities of aramid woven fabrics (LD_ARW and HD_ARW), an aramid knit (AR_KT), and nonwoven (AR_NW). Fabricated graphene/polymer coated electrical heating textile (GR) exhibits a surface temperature of about 85 °C, a current of 0.12 A, and a power of 3 W when 30 V is applied. As composed with 4-layer, the surface temperature of LD_ARW and HD_ARW used as the outer for sample indicated less than 50 °C, due to their excellent heat resistance property; whereas, when AR_KT and AR_NW were used, the temperature was about 50 °C. This is because their fine fibers form high porosity that can entrap air. As a result of the thermal insulation properties, the temperature difference of each layer was in the order ΔT(GR-N3) < ΔT(GR-Lining) < ΔT(GR-Outer). In particular, when AR_NW was used as the outer fabric, ΔT(GR-Outer) was decreased by about 10 °C, compared with that of the other outer fabric. By the effect of relative humidity under dry 25% RH and comfortable 55% RH, the temperature difference was decreased under 55% RH; thus, the thermal insulation property was improved under comfortable humidity condition. Therefore, the best thermal insulation performance was exhibited when AR_NW was used as outer under 55% RH, and it is expected to expand its application to fabric heating element for protective clothing.

Novel Bionic Biomembrane Supported by Gold Nanoparticles/Cellulose Hybrid Films

2012 ◽  
Vol 84 ◽  
pp. 13-18 ◽  
Author(s):  
Zhi Ming Liu ◽  
Yuan Lin An ◽  
Wen Jian Wu
Keyword(s):  
Gold Nanoparticles ◽  
Aqueous Solutions ◽  
Lipid Membranes ◽  
Hybrid Film ◽  
Bilayer Lipid Membranes ◽  
Hybrid Films ◽  
Bilayer Lipid ◽  
Long Period ◽  
Highly Active ◽  
The Stability

As one of the main methods to study biomembranes, the construction of highly active bionic biomembrane systems is very important. Based on the hybrid film of gold nanoparticles and cellulose, a novel system of bionic biomembrane is demonstrated. The ratio effects of lecithin to cholesterin on the stability of bilayer lipid membranes are studied. Lipid solutions that can form stable membranes in the air and in some aqueous solutions are prepared. The bionic biomembranes composed of bilayer lipid membranes and hybrid films of gold nanoparticles and cellulose can be sustained for a long period in aqueous solutions. The bionic biomembranes also exhibit some interesting electrochemical properties.

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