Characteristics of polyurethane nanowebs treated with silver nanowire solutions as strain sensors

This study presents a simple methodology to fabricate a conductive polyurethane nanoweb for use as a textile strain sensor. The purpose of this paper is to (1) fabricate an electrically-conductive polyurethane nanoweb coated with silver nanowires and investigate changes in its electrical resistance in relation to the amount of silver nanowires, (2) investigate changes in the electrical resistance of the polyurethane nanowebs under stretching, (3) evaluate the mechanical and chemical properties of the treated nanowebs, and (4) observe the breathability of the coated nanowebs. Silver nanowires dispersed in ethanol (AgNW) were diluted as necessary by addition of ethanol. Electrical conductivity was imparted to the polyurethane nanowebs by a pour-coating process utilizing AgNWs. The initial electrical resistance of the specimens and the changes with stretching up to 20% and release were recorded, and the data were analyzed. The electrical resistance decreased in accordance with the AgNW concentration. The electrical resistance increased under stretch and decreased upon release. Field-emission scanning electron microscopy with energy dispersive spectroscopy and atomic force microscopy analysis displayed the polyurethane, the silver nanowire attachment to the fibers, and the silver nanowire networks. According to Fourier transform infrared spectroscopy analysis, hydrogen bonds derived from the treatment with ethanol generated a crimp structure on the polyurethane nanowebs. Both tensile strength and bending rigidity increased after the treatment. Breathability tests showed that the specimens had semi-windproof and good water vapor transmission properties as textiles.

Download Full-text

Effect of Flash Light Sintering on Silver Nanowire Electrode Networks

Materials ◽

10.3390/ma13020404 ◽

2020 ◽

Vol 13 (2) ◽

pp. 404 ◽

Cited By ~ 2

Author(s):

Dae-Jin Yang ◽

Seyun Kim ◽

Hiesang Sohn ◽

Kyoung-Seok Moon ◽

Woo Hyeong Sim ◽

...

Keyword(s):

Optimum Condition ◽

Thermal Annealing ◽

Mass Production ◽

Electrical Resistance ◽

Phase Structure ◽

Silver Nanowires ◽

Silver Nanowire ◽

Sintering Process ◽

Fast Process ◽

Nanowire Networks

We investigated the flash light sintering process to effectively reduce electrical resistance in silver nanowire networks. The optimum condition of the flash light sintering process reduces the electrical resistance by ~20%, while the effect of the conventional thermal annealing processes is rather limited for silver nanowire networks. After flash light sintering, the morphology of the junction between the silver nanowires changes to a mixed-phase structure of the two individual nanowires. This facile and fast process for silver nanowire welding could be highly advantageous to the mass production of silver nanowire networks.

Download Full-text

Atomic Force Microscopy Analysis of DNA Extracted from the Vegetative Cells and the Viable, but Nonculturable, Cells of Two Mycoplasmas (Acholeplasma laidlawiiPG8 andMycoplasma hominisPG37)

The Scientific World JOURNAL ◽

10.1100/tsw.2010.78 ◽

2010 ◽

Vol 10 ◽

pp. 894-900 ◽

Cited By ~ 3

Author(s):

Maxim V. Trushin ◽

Vladislav M. Chernov ◽

Oleg V. Gorshkov ◽

Natalija B. Baranova ◽

Olga A. Chernova

Keyword(s):

Atomic Force Microscopy ◽

Chemical Properties ◽

Mycoplasma Hominis ◽

Mycoplasma Species ◽

Viable But Nonculturable ◽

Force Microscopy ◽

Atomic Force ◽

Nonculturable Cells ◽

Mechanisms Of Adaptation ◽

Microscopy Analysis

This article reports on a study of some characteristics of DNA extracted from the vegetative and viable, but nonculturable (VBNC), cells of two mycoplasma species (Acholeplasma laidlawiiPG8 andMycoplasma hominisPG37) using atomic force microscopy (AFM). DNA images were obtained by operating the AFM microscope in the tapping mode. It was found that DNA from the VBNC forms ofM. hominisPG37 has decreased sizes (height: 0.177 ± 0.026 nm vs. 0.391 ± 0.041 nm for the vegetative forms, and width: 1.92 ± 0.099 vs. 2.17 ± 0.156 nm for the vegetative forms) in comparison to DNA from the vegetative forms of the mycoplasma. In the case of DNA from theA. laidlawiiPG8 VBNC forms, we detected a decrease in width (1.506 ± 0.076 nm vs. 1.898 ± 0.117 nm for the vegetative forms), but an increase in height (0.641 ± 0.068 nm vs. 0.255 ± 0.010 nm for the vegetative forms) of the molecule. Analyzing the obtained results, one can speculate on some similarities in the physical-chemical properties of DNA fromM. hominisPG37 andM. gallisepticumS6. In turn, this implies some general mechanisms of adaptation to a severe environment.

Download Full-text

TUNING PROPERTIES AND MORPHOLOGY IN HIGH VINYL CONTENT SBS BLOCK COPOLYMER, A THERMOPLASTIC ELASTOMER VIA THIOL-ENE MODIFICATION

Rubber Chemistry and Technology ◽

10.5254/rct.17.83761 ◽

2017 ◽

Vol 90 (3) ◽

pp. 550-561 ◽

Cited By ~ 2

Author(s):

Prithwiraj Mandal ◽

Siva Ponnupandian ◽

Soumyadip Choudhury ◽

Nikhil K. Singha

Keyword(s):

Block Copolymer ◽

Thermoplastic Elastomer ◽

Atomic Force Microscopy Analysis ◽

Ene Reaction ◽

Force Microscopy ◽

Atomic Force ◽

Microscopy Analysis ◽

Styrene Butadiene Styrene ◽

Styrene Butadiene ◽

Butadiene Styrene

ABSTRACT Thiol-ene modification of high vinyl content thermoplastic elastomeric styrene butadiene styrene (SBS) block copolymer (BCP) was carried out using different thiolating agents in toluene at 70 °C. 1H NMR analysis confirmed the participation of vinyl double bond in the thiol-ene modification reaction of SBS. Surface morphology of the block copolymers evaluated by atomic force microscopy analysis showed higher roughness after the thiol-ene reaction. The thiol-modified SBS block copolymer showed better adhesion strength and oil resistance properties than the pristine SBS.

Download Full-text

Atomic force microscopy analysis of native infectious and inactivated SARS-CoV-2 virions

Scientific Reports ◽

10.1038/s41598-021-91371-4 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Sébastien Lyonnais ◽

Mathilde Hénaut ◽

Aymeric Neyret ◽

Peggy Merida ◽

Chantal Cazevieille ◽

...

Keyword(s):

Atomic Force Microscopy ◽

Native Conformation ◽

Force Microscopy ◽

Enveloped Virus ◽

Atomic Force ◽

Afm Imaging ◽

Level 3 ◽

Microscopy Analysis ◽

Virus Morphology ◽

Nanoscale Level

AbstractSARS-CoV-2 is an enveloped virus responsible for the Coronavirus Disease 2019 (COVID-19) pandemic. Here, single viruses were analyzed by atomic force microscopy (AFM) operating directly in a level 3 biosafety (BSL3) facility, which appeared as a fast and powerful method to assess at the nanoscale level and in 3D infectious virus morphology in its native conformation, or upon inactivation treatments. AFM imaging reveals structurally intact infectious and inactivated SARS-CoV-2 upon low concentration of formaldehyde treatment. This protocol combining AFM and plaque assays allows the preparation of intact inactivated SARS-CoV-2 particles for safe use of samples out of level 3 laboratory to accelerate researches against the COVID-19 pandemic. Overall, we illustrate how adapted BSL3-AFM is a remarkable toolbox for rapid and direct virus analysis based on nanoscale morphology.

Download Full-text

Infrared Characterization of PMMA-SiO2 Hybrid Glasses Obtained by Sol-Gel Process

MRS Proceedings ◽

10.1557/proc-1278-s08-13 ◽

2010 ◽

Vol 1278 ◽

Author(s):

L.L. Díaz-Flores ◽

A. S. López Rodríguez ◽

P. SifuentesGallardo ◽

M.A. Hernàndez Rivera ◽

M.a Garnica Romo ◽

...

Keyword(s):

Sol Gel ◽

Chemical Properties ◽

Hybrid Coatings ◽

Force Microscopy ◽

Air Atmosphere ◽

Atomic Force ◽

Sol Gel Process ◽

Traditional Process ◽

And Chemical Properties

AbstractThis work is about the production of hybrid coatings of the system SiO2-PMMA (PMMA, polymethylmethacrylate). These materials have interesting mechanical and chemical properties useful for anticorrosive and wear resistance applications. SiO2-PMMA hybrids were obtained by the sol-gel traditional process, using tetraethylorthosilicate (TEOS) and methylmethacrylate (MMA) by Aldrich Co, as starting reagents. The SiO2:PMMA ratio was varied from 0:1 to about 1:1 at air atmosphere deposition. The coatings were obtained on acrylic sheets and silicon wafers. A diversity of coatings with chemical composition ranging from SiO2 and PMMA to obtain the SiO2-PMMA hybrids were obtained. Infrared (IR) and atomic force microscopy (AFM), were performed to determinate structural and morphological behavior.

Download Full-text

Conducting tip atomic force microscopy analysis of aluminum oxide barrier defects decorated by electrodeposition

Applied Physics Letters ◽

10.1063/1.1415775 ◽

2001 ◽

Vol 79 (19) ◽

pp. 3158-3160 ◽

Cited By ~ 3

Author(s):

J. Carrey ◽

K. Bouzehouane ◽

J.-M. George ◽

C. Ceneray ◽

A. Fert ◽

...

Keyword(s):

Atomic Force Microscopy ◽

Aluminum Oxide ◽

Atomic Force Microscopy Analysis ◽

Force Microscopy ◽

Atomic Force ◽

Microscopy Analysis ◽

Oxide Barrier

Download Full-text

Stereocomplex electrospun fibers from high molecular weight of poly(L-lactic acid) and poly(D-lactic acid)

Journal of Polymer Engineering ◽

10.1515/polyeng-2019-0026 ◽

2020 ◽

Vol 40 (2) ◽

pp. 136-142 ◽

Cited By ~ 1

Author(s):

Homa Maleki ◽

Hossein Barani

Keyword(s):

Molecular Weight ◽

Lactic Acid ◽

Thermal Properties ◽

High Molecular Weight ◽

Chemical Properties ◽

Electrospun Fibers ◽

Scanning Calorimetry ◽

Force Microscopy ◽

Atomic Force ◽

Electrospinning Method

AbstractThe stereocomplex formation is a promising method to improve the properties of poly(lactide) (PLA)-based products due to the strong interaction of the side-by-side arrangement of the molecular chains. Recently, electrospinning method has been applied to prepare PLA stereocomplex, which is more convenient. The objective of the current study is to make stereocomplexed PLA nanofibers using electrospinning method and compare their properties and structures with pure poly(l-lactide) (PLLA) fibers. The stereocomplexed fibers were electrospun from a blend solution of high molecular weight PLLA and poly(d-lactide) (1:1 ratio). The morphology of the obtained electrospun fibers was examined by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Differential scanning calorimetry was applied to study their thermal properties and crystallinity. Fourier transform infrared spectroscopy (FTIR) test was conducted on the samples to characterize their chemical properties. The SEM and AFM images indicated that smooth uniform fibers with a cylindrical structure were produced. Besides, the FTIR results and thermal properties confirmed that only stereocomplex crystallites formed in the resulting fibers via the electrospinning method.

Download Full-text

LIPSS Structures Induced on Graphene-Polystyrene Composite

Materials ◽

10.3390/ma12213460 ◽

2019 ◽

Vol 12 (21) ◽

pp. 3460 ◽

Cited By ~ 4

Author(s):

Dominik Fajstavr ◽

Klára Neznalová ◽

Václav Švorčík ◽

Petr Slepička

Keyword(s):

Chemical Properties ◽

Laser Pulses ◽

Periodic Pattern ◽

Krypton Fluoride ◽

Periodic Surface ◽

Laser Modification ◽

Force Microscopy ◽

Periodic Surface Structure ◽

Atomic Force ◽

Physico Chemical

A laser induced periodic surface structure (LIPSS) on graphene doped polystyrene was prepared by the means of a krypton fluoride (KrF) laser with the wavelength of 248 nm and precisely desired physico-chemical properties were obtained for the structure. Surface morphology after laser modification of polystyrene (PS) doped with graphene nanoplatelets (GNP) was studied. Laser fluence values of modifying laser light varied between 0–40 mJ·cm−2 and were used on polymeric PS substrates doped with 10, 20, 30, and 40 wt. % of GNP. GNP were incorporated into PS substrate with the solvent casting method and further laser modification was achieved with the same amount of laser pulses of 6000. Formed nanostructures with a periodic pattern were examined by atomic force microscopy (AFM). The morphology was also studied with scanning electron microscopy SEM. Laser irradiation resulted in changes of chemical composition on the PS surface, such as growth of oxygen concentration. This was confirmed with energy-dispersive X-ray spectroscopy (EDS).

Download Full-text