Effect of 2-phenoxyethanol pre-treatment on structure and adhesion properties of thermotropic liquid crystal polyarylate fibers

2021 ◽  
pp. 004051752098588
Author(s):  
Xin Chen ◽  
Bingqian Liu ◽  
Dan Sheng ◽  
Honghui Xia ◽  
Heng Pan ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Photoelectron Spectroscopy ◽  
Atomic Ratio ◽  
Chemical Compositions ◽  
Adhesive Properties ◽  
Adhesion Properties ◽  
Force Microscopy ◽  
Thermotropic Liquid Crystal ◽  
Peeling Strength ◽  
Pre Treatment

This study investigated the surface modification of thermotropic liquid crystal polyarylate (TLCP) fibers by 2-phenoxyethanol pre-treatment, specifically, whether it enhanced their interfacial adhesive properties. The surface chemical compositions and microstructures of both control and 2-phenoxyethanol pre-treated TLCP fibers were characterized by X-ray photoelectron spectroscopy, scanning electron microscopy, and atomic force microscopy. Furthermore, thermal, dyeing, and adhesion properties of both control and 2-phenoxyethanol pre-treated fibers were compared by thermogravimetric analysis, colorimetry, and universal material testing system, respectively. The results indicated that 2-phenoxyethanol pre-treatment increased the surface-anchored oxygen atom amount: the oxygen to carbon atomic ratio at the surface of the TLCP fibers increased from 0.17 to 0.22. However, 2-phenoxyethanol pre-treatment showed almost no effect on the thermal stability and mechanical properties of the TLCP fibers. The peeling strength of the 2-phenoxyethanol pre-treated TLCP fabric was around twice that of the control TLCP fabric.

scholarly journals Synthesis of amphiphilic ABA triblock oligomer via ATRP and its surface properties

2017 ◽  
Vol 95 (5) ◽  
pp. 605-611 ◽  
Author(s):  
Lei Wang ◽  
Shaoqing Wen ◽  
Zhanxiong Li
Keyword(s):  
Photoelectron Spectroscopy ◽  
Microphase Separation ◽  
Gel Permeation Chromatography ◽  
Contact Angles ◽  
Chemical Compositions ◽  
Water Contact ◽  
Force Microscopy ◽  
Atomic Force ◽  
Poly Ethylene ◽  
Magnetic Resonances

A series of novel amphiphilic ABA-type poly(tridecafluorooctylacrylate)-poly(ethylene glycol)-poly(tridecafluorooctylacrylate) (henceforth referred to as p-TDFA-PEG-p-TDFA) triblock oligomers were successfully synthesized via atom transfer radical polymerization (ATRP) using well-defined Br-PEG-Br as macroinitiator and copper as catalyst. The block oligomers were characterized by Fourier transform infrared (FTIR) spectroscopy and 1H and 19F nuclear magnetic resonances (NMR). Gel permeation chromatography (GPC) showed that the block oligomers have been obtained with narrow molecular weight distributions of 1.22–1.33. X-ray photoelectron spectroscopy (XPS) was carried out to confirm the attachment of p-TDFA-PEG-p-TDFA onto the silicon substrate, together with the chemical compositions of p-TDFA-PEG-p-TDFA. The wetabilities of the oligomer films were measured by water contact angles (CAs). Water CAs of p-TDFA-PEG-p-TDFA film were measured and their morphologies were tested by atomic force microscopy (AFM). The result showed that the CAs of the oligomer films, which possess fluoroalkyl groups assembled on the outer surface, increase after heating due to the migration of fluoroalkyl groups and the resulted microphase separation of the p-TDFA-PEG-p-TDFA.

CHARACTERIZATION OF ALUMINUM SURFACES AFTER DIFFERENT PRETREATMENTS AND EXPOSURE TO SILANE COUPLING AGENTS

2001 ◽  
Vol 08 (01n02) ◽  
pp. 43-50 ◽  
Author(s):  
M. KONO ◽  
X. SUN ◽  
R. LI ◽  
K. C. WONG ◽  
K. A. R. MITCHELL ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Coupling Agents ◽  
Chemical Compositions ◽  
Silane Coupling Agents ◽  
Oh Groups ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Aluminum Surfaces

X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and scanning electron microscopy (SEM) have been used to characterize surfaces of aluminum which have been pretreated by mechanical polishing, acid etching and alkaline etching, as well as given subsequent exposures to air and water. These surfaces can differ markedly with regard to their chemical compositions and topographical structures. Characterizations of these surfaces after exposures to three organosilanes, γ-GPS, BTSE and γ-APS, indicate that the amount of silane adsorbed in each case shows a tendency to increase both with the number of OH groups detected at the oxidized aluminum and with the surface roughness. The XPS data are consistent with the adhesion of γ-APS occurring through H bonding, especially via NH3+ groups.

scholarly journals Plasma Etching Behavior of SF6 Plasma Pre-Treatment Sputter-Deposited Yttrium Oxide Films

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 637
Author(s):  
Wei-Kai Wang ◽  
Sung-Yu Wang ◽  
Kuo-Feng Liu ◽  
Pi-Chuen Tsai ◽  
Yu-Hao Zhang ◽  
...  
Keyword(s):  
Yttrium Oxide ◽  
Plasma Etching ◽  
Photoelectron Spectroscopy ◽  
Film Surface ◽  
Chemical Compositions ◽  
Plasma Irradiation ◽  
Fluorocarbon Plasma ◽  
Sulfur Fluoride ◽  
Pre Treatment ◽  
Sputter Deposited

Yttrium oxyfluoride (YOF) protective materials were fabricated on sputter-deposited yttrium oxide (Y2O3) by high-density (sulfur fluoride) SF6 plasma irradiation. The structures, compositions, and fluorocarbon-plasma etching behaviors of these films were systematically characterized by various techniques. After exposure to SF6 plasma, the Y2O3 film surface was fluorinated significantly to form a YOF film with an approximate average thickness of 30 nm. X-ray photoelectron spectroscopy revealed few changes in the elemental and chemical compositions of the surface layer after fluorination, confirming the chemical stability of the YOF/Y2O3 sample. Transmission electron microscopy confirmed a complete lattice pattern on the YOF/Y2O3 structure after fluorocarbon plasma exposure. These results indicate that the SF6 plasma-treated Y2O3 film is more erosion resistant than the commercial Y2O3 coating, and thus accumulates fewer contamination particles.

scholarly journals Effect of Sputtering Temperature on Fluorocarbon Films: Surface Nanostructure and Fluorine/Carbon Ratio

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 848 ◽  
Author(s):  
Qi Zhao ◽  
Feipeng Wang ◽  
Kaizheng Wang ◽  
Guibai Xie ◽  
Wanzhao Cui ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Target Material ◽  
Chemical Compositions ◽  
Water Contact ◽  
Force Microscopy ◽  
Fluorocarbon Films ◽  
Atomic Force ◽  
Surface Nanostructure ◽  
Deposited Film ◽  
Fluorocarbon Film

In this work, fluorocarbon film was deposited on silicon (P/100) substrate using polytetrafluoroethylene (PTFE) as target material at elevated sputtering temperature. Field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) were employed to investigate the surface morphology as well as structural and chemical compositions of the deposited film. The surface energy, as well as the polar and dispersion components, were determined by water contact angle (WCA) measurement. The experimental results indicated that increasing sputtering temperature effectively led to higher deposition rate, surface roughness and WCA of the film. It was found that the elevated temperature contributed to increasing saturated components (e.g., C–F2 and C–F3) and decreasing unsaturated components (e.g., C–C and C–CF), thus enhancing the fluorine-to-carbon (F/C) ratio. The results are expected aid in tailoring the design of fluorocarbon films for physicochemical properties.

Surface Functionalisation of Polyester Nonwoven Fabrics by Sputter Coating of Titanium Dioxide

2009 ◽  
Vol 17 (6) ◽  
pp. 347-351 ◽  
Author(s):  
Yang Xu ◽  
Ning Wu ◽  
Qufu Wei ◽  
Libo Chu
Keyword(s):  
Titanium Dioxide ◽  
Photoelectron Spectroscopy ◽  
Chemical Compositions ◽  
Sem Images ◽  
Xps Spectra ◽  
Force Microscopy ◽  
Nonwoven Fabrics ◽  
Significant Difference ◽  
Sputter Coating ◽  
Before And After

Titanium dioxide (TiO2) functional films were deposited on the surface of polyester nonwoven fabrics at room temperature by direct current (DC) reactive magnetron sputtering. Atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) were employed to study the topographies and chemical compositions of the functional fabric surfaces, respectively. Scanning electron microscopy (SEM) was used to investigate the interfacial microstructures and adhesion between the substrate and TiO2 coating. The AFM observations indicated that there was a significant difference in the surface morphology of the polyester fibres before and after TiO2 sputter coating. XPS spectra reflected the chemical features of the deposited TiO2 nanostructures. The SEM images showed that TiO2 thin films deposited on the substrate under confirmed processing conditions had unique, fine surfaces and good adhesion to the substrate. It was found that the deposition of TiO2 on the polyester nonwoven fabrics significantly improved their ultraviolet (UV) absorption and antistatic properties.

Simultaneous Analysis of Elastic and Nonspecific Adhesive Properties of Thin Sample and Biological Cell Considering Bottom Substrate Effect

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Vishwanath Managuli ◽  
Sitikantha Roy
Keyword(s):  
Atomic Force Microscopy ◽  
Correction Term ◽  
Work Of Adhesion ◽  
Common Source ◽  
Substrate Effect ◽  
Adhesive Properties ◽  
Adhesion Properties ◽  
Force Microscopy ◽  
Bottom Substrate ◽  
Atomic Force

A new asymptotically correct contact model has been developed for conical tip based atomic force microscopy (AFM) nanoindentation. This new model provides both elastic and nonspecific adhesion properties of cells and soft gels by taking sample thickness at the point of indentation and its depth of indentation into consideration. The bottom substrate effect (BSE) is the most common source of error in the study of “AFM force maps” of the cellular sample. The present model incorporates an asymptotically correct correction term as a function of depth of indentation to eliminate the substrate effect in the analysis. Later, the model is extended to analyze the unloading portion of the indentation curve to extract the stiffness and adhesive properties simultaneously. A comparative study of the estimated material properties using other established contact models shows that the provided corrections effectively curb the errors coming from infinite thickness assumption. Nonspecific adhesive nature of a cell is represented in terms of adhesion parameter (γa) based on the “work of adhesion,” this is an alternative to the peak value of tip–sample attractive (negative) force commonly used as representative adhesion measurement. The simple analytical expression of the model can help in estimating more realistic and accurate biomechanical properties of cells from atomic force microscopy based indentation technique.

The influence of surface hydrophilicity on the adhesion properties of wet fabrics or films to water

2017 ◽  
Vol 88 (1) ◽  
pp. 108-117 ◽  
Author(s):  
Lin Lou ◽  
Yiping Qiu ◽  
Feng Ji ◽  
Xiaohang Zhu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Adhesion Force ◽  
Atmospheric Pressure Plasma ◽  
Atomic Ratio ◽  
Liquid Interface ◽  
Theoretical Expression ◽  
Water Contact ◽  
Adhesion Properties ◽  
Fabric Materials ◽  
The Relationship

The adherence of wet fabrics to the skin brings much discomfort. The relationship between hydrophilicity and adhesion properties of fabric materials is investigated. A theoretical expression is given to describe the relationship of adhesion force, water contact angle (WCA), and radius of fabric–liquid interface. The adhesion force grows with decreasing WCA and increasing radius of the fabric–liquid interface. With the help of atmospheric pressure plasma jet (APPJ) treatment, the hydrophilicity of the fabric materials is improved, accompanied by reduced WCA, roughened fiber surfaces, as observed by scanning electronic microscope (SEM), and increased Oxygen/Carbon (O/C) atomic ratio and polar bonds, analyzed by X-ray photoelectron spectroscopy (XPS). In accordance with the theoretical conclusion, the APPJ treated fabrics have a much larger maximum adhesion force and longer adhesion duration with water, indicating more discomfort resulting from the increase of hydrophilicity when they are wet. To minimize the discomfort caused by wet adhesion, less hydrophilic fabric surfaces may be preferred.

Degradation of Co-Evaporated Perovskite Thin Films

MRS Advances ◽  
2016 ◽  
Vol 1 (14) ◽  
pp. 923-929 ◽  
Author(s):  
Congcong Wang ◽  
Youzhen Li ◽  
Xuemei Xu ◽  
Benjamin Ecker ◽  
Chenggong Wang ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Substantial Reduction ◽  
Complete Removal ◽  
Ambient Air ◽  
Atomic Ratio ◽  
X Ray Diffraction ◽  
Structural Conversion ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force

ABSTRACTMethylammonium lead halide perovskites have been developed as highly promising materials to fabricate efficient solar cells in the past few years. We have investigated degradation of co-evaporated CH3NH3PbI3 films in ambient air, oxygen and water respectively using x-ray photoelectron spectroscopy (XPS), small angle x-ray diffraction (XRD), atomic force microscopy (AFM), and scanning electron microscopy (SEM). The CH3NH3PbI3 film has an excellent atomic ratio and crystallinity. XPS results indicate that the film is not sensitive to oxygen and dry air, while ambient and water exposures achieve similar effects. XRD further indicates a structural conversion to PbI2 and a drastic morphology change from smooth to rough is revealed by AFM and SEM. The experiment indicated that H2O plays a dominated role in the degradation of CH3NH3PbI3 films. The degradation can be characterized by almost complete removal of N, substantial reduction of I, residual of PbI2, C, O, and I compounds on the surface.

Dielectric Properties of Er-Doped HfTiO Films for High-K Gate Stacks

2011 ◽  
Author(s):  
Xianfei Li ◽  
Ping Wu ◽  
Hui Wang ◽  
Yili Pei ◽  
Sen Chen ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Gate Dielectric ◽  
Dielectric Materials ◽  
Atomic Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
High K ◽  
Er Doped

HfTiErO and HfTiO thin films (∼50nm), as potential replacements for traditional SiO2 gate dielectric materials, were prepared on n-Si (100) substrates by radio frequency magnetron sputtering. The dielectric characteristics of HfTiErO were compared with those of HfTiO. The structure of HfTiErO was analyzed by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The growth of HfTiErO and HfTiO were observed by field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM). Experimental results indicate that as the Er content increases, the dielectric constant (k) can increase to the maximum (∼20.2) and then decrease. In comparison with HfTiO, HfTiErO films (the atomic ratio of Hf:Ti:Er was 1:0.16:0.10) can exhibit a higher relative permittivity (increasing by 54% compared with HfTiO), a smoother interface, a better surface microscopy and a lower interface trap density in C-V curves.

Effect of Functional Groups on Interfacial Adhesion Properties of PEEK/Carbon Fiber Composites

2014 ◽  
Vol 598 ◽  
pp. 66-72 ◽  
Author(s):  
Umut Yapıcı ◽  
Lei Pan ◽  
Fei Xu ◽  
Jia Meng Cao
Keyword(s):  
Carbon Fiber ◽  
Functional Groups ◽  
Photoelectron Spectroscopy ◽  
Interfacial Properties ◽  
Chemical Compositions ◽  
Carbon Fiber Composites ◽  
Adhesion Properties ◽  
Piranha Solution ◽  
Chemical Solutions ◽  
Interlaminar Shear

In our work, we aimed to improve the interfacial properties of the Polyetheretherketone (PEEK) polymer/carbon fiber (CF) by treating the fibers with wet chemical method, a higly oxidative chemical solutions called piranha solution and chromate solution. The changes of the surface funtional groups, chemical compositions and structures of the carbon fibers were characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR),surface morphology was studied by scanning electron microscopy (SEM), mechanical interfacial properties of the composites was evaluated by means of interlaminar shear strength (ILSS) tests. The results indicated that graphitic carbon was the major carbon functional component on the carbon fiber surfaces and other functional groups were also presented, such as C–O, C-OH, C = O. Consequently, these introductions of oxygen functional groups onto the carbon fiber surfaces led to an improvement of the ILSS of the composites.

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