Superhydrophobic inkjet printed flexible graphene circuits via direct-pulsed laser writing

Nanoscale ◽  
2017 ◽  
Vol 9 (48) ◽  
pp. 19058-19065 ◽  
Author(s):  
Suprem R. Das ◽  
Srilok Srinivasan ◽  
Loreen R. Stromberg ◽  
Qing He ◽  
Nathaniel Garland ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Molecular Dynamic Simulation ◽  
Molecular Dynamic ◽  
Dynamic Simulation ◽  
Pulsed Laser ◽  
Scanning Electron Microscopy Micrographs ◽  
Simulation Results ◽  
Scanning Electron

(Left) Scanning electron microscopy micrographs and corresponding contact angle (CA) images for (top) thermally annealed inkjet printed graphene (IPG) and (bottom) laser annealed (IPG). (Right) Molecular dynamic simulation results correlating CA and changes in graphene petal orientation due to laser treated IPG.

scholarly journals Antibacterial activity of zinc oxide nanoparticles obtained by pulsed laser ablation in water and air

2018 ◽  
Vol 243 ◽  
pp. 00017 ◽  
Author(s):  
Daria Goncharova ◽  
Ekaterina Gavrilenko ◽  
Anna Nemoykina ◽  
Valery Svetlichnyi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Antibacterial Activity ◽  
Laser Ablation ◽  
Zno Nanoparticles ◽  
Antibacterial Properties ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Composition And Structure ◽  
Scanning Electron

The paper studies physicochemical and antibacterial properties of ZnO nanoparticles obtained by pulsed laser ablation in water and air. Their composition and structure were studied by X-ray diffraction, transmission and scanning electron microscopy. Antibacterial activity of the nanoparticles was examined by its affection on Gram-positive Staphylococcus aureus (S.aureus). The dependence of nanoparticles’ physical and chemical antibacterial properties on the conditions of the ablation was shown. The model materials for the antibacterial bandage were made of cotton, filter paper and biodegradable polymer scaffolds (poly-l-lactide acid), and then they were coated with the obtained ZnO nanoparticles. The model bandage materials were examined by the scanning electron microscopy method and their antibacterial activity (ISO 20743:2013) was determined. High activity of all the samples against S.aureus was proved.

Identification of human hookworm in failed-treatment cases using Chinese hamsters (Cricetulus griseus) and scanning electron microscopy

1991 ◽  
Vol 65 (1) ◽  
pp. 67-72 ◽  
Author(s):  
A. C. Evans ◽  
T. J. M. Daly ◽  
M. B. Markus
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cricetulus Griseus ◽  
Scanning Electron Microscopy Micrographs ◽  
Necator Americanus ◽  
Points Of Interest ◽  
Chinese Hamsters ◽  
Single Animal ◽  
Small Intestines ◽  
Scanning Electron

ABSTRACTAn attempt was made to identify the human hookworm involved in failed-treatment cases using abnormal hosts and scanning electron microscopy. Thirty-seven, 2 to 6 month old Chinese hamsters (Cricetulus griseus) from a closed, outbred, conventional colony, were each given between 20 and 120 filariform larvaeper os. The larvae were cultured from faeces from mebendazole (Vermox®) 500 mg single-dose, failed-treatment cases living in the lowveld farming area of the Transvaal Province, South Africa. About 60 to 78 days after inoculation, the animals were killed and adult worms were removed from their small intestines. Eleven (30%) of the 37 hamsters harboured a total of 31 adult worms (19 males and 12 females), while 26 hamsters were refractory to infection. The greatest number of worms recovered from a single animal was six. A total of 27 worms (17 males and 10 females) were subjected to examination by scanning electron microscopy. Micrographs showed male and female worms to be morphologically all of theNecator americanusspecies, as identified by a pair of ventral and dorsal cutting plates, a dorsal tooth and the fused terminus of spicules in the male bursa. The transverse cuticular striations were distinct and smooth. Several points of interest arose from the results of this study and are discussed.

Influence of the Treatment with Sulfuric Acid on Adhesion of Natural Rubber and Cast Polyurethane Elastomers

2012 ◽  
Vol 452-453 ◽  
pp. 86-90 ◽  
Author(s):  
Zhi Yi Zhang ◽  
Hui Jun Niu ◽  
Jia Jia Zhang ◽  
Yan Yun Cui
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Sulfuric Acid ◽  
Natural Rubber ◽  
Angle Measurement ◽  
Polyurethane Elastomers ◽  
Adhesion Properties ◽  
Rubber Surface ◽  
Scanning Electron

In this study, natural rubber (NR) was treated with sulfuric acid to improve its adhesion properties to polar polymer. T-peel strength tests, scanning electron microscopy, contact-angle measurement (water), Energy Dispersive X-ray Detector were used to analyze the nature of the NR surface modifications which were carried out with sulfuric acid. A noticeable decrease in contact angle was observed on the rubber surface by contact-angle measurements which can be ascribed to the increase of oxidized moieties on the rubber surface. EDX revealed that oxidized moieties were created through treatment with sulfuric acid. The surface modification and mode of bond failure were studied by scanning electron microscopy (SEM). Immersion in sulfuric acid for 15min produced the maximum adhesion strength (10kN/m) and produced a mixed failure mode (interface & rubber failure in the rubber). Treatment with sulfuric acid produced improved wettability as well as chemical (surface oxidation) and morphological modifications (roughness) of the rubber surface.

scholarly journals Preparation and Characterization of K-Carrageenan/Nanosilica Biocomposite Film

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Lokesh R. Rane ◽  
Niranjan R. Savadekar ◽  
Pravin G. Kadam ◽  
Shashank T. Mhaske
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Tensile Strength ◽  
Water Vapour ◽  
Transmission Rate ◽  
Composite Films ◽  
Tensile Modulus ◽  
Water Vapour Transmission Rate ◽  
Scanning Electron

The purpose of this study is to improve the performance properties of K-carrageenan (K-CRG) by utilizing nanosilica (NSI) as the reinforcing agent. The composite films were prepared by solution casting method. NSI was added up to 1.5% in the K-CRG matrix. The prepared films were characterized for mechanical (tensile strength, tensile modulus, and elongation at break), thermal (differential scanning calorimetry, thermogravimetric analysis), barrier (water vapour transmission rate), morphological (scanning electron microscopy), contact angle, and crystallinity properties. Tensile strength, tensile modulus, and crystallinity were found to have increased by 13.8, 15, and 48% whereas water vapour transmission rate was found to have decreased by 48% for 0.5% NSI loaded K-CRG composite films. NSI was found to have formed aggregates for concentrations above 0.5% as confirmed by scanning electron microscopy. Melting temperature, enthalpy of melting, and degradation temperature of K-CRG increased with increase in concentration of NSI in K-CRG. Contact angle also increased with increase in concentration of NSI in K-CRG, indicating the decrease in hydrophilicity of the films improving its water resistance properties. This knowledge of the composite film could make beneficial contributions to the food and pharmaceutical packaging applications.

Super-Hydrophobic Surfaces Improve Corrosion Resistance of Fe3Al-Type Intermetallic in Seawater

2008 ◽  
Vol 47-50 ◽  
pp. 173-176 ◽  
Author(s):  
Tao Liu ◽  
Kin Tak Lau ◽  
Shou Gang Chen ◽  
Sha Cheng ◽  
Yan Sheng Yin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Hydrophobic Surface ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Atomic Force ◽  
Scanning Electron

A novel super-hydrophobic film was prepared by myristic acid (CH3(CH2)12COOH) chemically adsorbed onto the polyethyleneimine (PEI) coated Fe3Al-type intermetallic wafer. The film character and structure were probed with contact angle measurement, scanning electron microscopy (SEM) and atomic force microscope (AFM). The results suggest that the structure of the film is similar to lotus and the seawater contact angle is larger than 150◦. Moreover, the corrosion resistances of untreated and modified samples in seawater were investigated by electrochemical impedance spectroscopy (EIS). Experimental results show that the corrosion rate of Fe3Al-type intermetallic with super-hydrophobic surface decreases dramatically because of its special microstructure.

Photoemission Study of Low-Fluence, Non-Thermal Laser Damage of UHV-Cleaved Gallium Arsenide (110)

1990 ◽  
Vol 201 ◽  
Author(s):  
S. S. Goldenberg ◽  
J. P. Long ◽  
M. N. Kabler
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Gallium Arsenide ◽  
Temperature Rise ◽  
Photoelectron Spectroscopy ◽  
Pulsed Laser ◽  
Laser Damage ◽  
Laser Fluences ◽  
Photoemission Study ◽  
Scanning Electron

AbstractThe pulsed-laser induced photochemical production of metallic Ga islands on the surface of GaAs cleaved, irradiated, and studied in ultrahigh vacuum (UHV) is documented through photoelectron spectroscopy and subsequent scanning electron microscopy. Ga islands are detected for laser fluences as low as 1 mJ/cm2, far below those previously reported for modification of GaAs, and for which the temperature rise is negligible.

scholarly journals Anti-Foulant Ultrafiltration Polymer Composite Membranes Incorporated with Composite Activated Carbon/Chitosan and Activated Carbon/Thiolated Chitosan with Enhanced Hydrophilicity

Membranes ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 827
Author(s):  
Syeda Samia Nayab ◽  
M. Asad Abbas ◽  
Shehla Mushtaq ◽  
Bilal Khan Niazi ◽  
Mehwish Batool ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Activated Carbon ◽  
Bovine Serum Albumin ◽  
Bovine Serum ◽  
Carbon Composite ◽  
Flux Rate ◽  
Thiolated Chitosan ◽  
Scanning Electron

A rapid increase in population worldwide is giving rise to the severe problem of safe drinking water availability, necessitating the search for solutions that are effective and economical. For this purpose, membrane technology has shown a lot of promise but faces the challenge of fouling, leading to a reduction in its lifetime. In this study, ultrafiltration polyethersulfone membranes were synthesized in two different concentrations, 16% wt. and 20% wt., using the phase inversion method. Chitosan and activated carbon were incorporated as individual fillers and then as composites in both the concentrations. A novel thiolated chitosan/activated carbon composite was introduced into a polyethersulfone membrane matrix. The membranes were then analyzed using Attenuated Total Reflection–Fourier-Transform Infrared spectroscopy (ATR-FTIR), Scanning Electron Microscopy (SEM), optical profilometry, gravimetric analysis, water retention, mechanical testing and contact angle. For membranes with the novel thiolated chitosan/activated carbon composite, Scanning Electron Microscopy micrographs showed better channels, indicating a better permeability possibility, reiterated by the flux rate results. The flux rate and bovine serum albumin flux were also assessed, and the results showed an increase from 105 L/m2h to 114 L/m2h for water flux and the antifouling determined by bovine serum albumin flux increased from 23 L/m2h to 51 L/m2h. The increase in values of water uptake from 22.84% to 76.5% and decrease in contact angle from 64.5 to 55.7 showed a significant increase in the hydrophilic character of the membrane.

Single-stage electrospun innovative combination of polyurethane and neem oil: Synthesis, characterization and appraisal of blood compatibility

2018 ◽  
Vol 33 (6) ◽  
pp. 573-584 ◽  
Author(s):  
Mohan Prasath Mani ◽  
Saravana Kumar Jaganathan ◽  
Ahmad Zahran Khudzari ◽  
Rajasekar Rathanasamy ◽  
Praseetha Prabhakaran
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Partial Thromboplastin Time ◽  
Blood Compatibility ◽  
Activated Partial Thromboplastin Time ◽  
The Novel ◽  
Neem Oil ◽  
Composite Patch ◽  
Scanning Electron

Wound healing is a complex process and it requires proper scaffolding for regeneration. An ideal scaffold should provide optimal environmental conditions in order to assist cellular attachment, proliferation and differentiation. In this work, a new composite based on polyurethane and neem oil was fabricated using one-step electrospinning technique. Fabricated composite patch along with the pristine polyurethane was characterized through scanning electron microscopy, Fourier transform and infrared spectroscopy, thermogravimetric analysis, contact angle measurement and atomic force microscopy. Moreover, the blood compatibility was evaluated using activated partial thromboplastin time, partial thromboplastin time and haemolysis assay. Scanning electron microscopy studies of composites revealed the existence of fibres with a smaller diameter (635  ± 105 nm) compared to the pristine polyurethane (969 ± 217 nm). Fourier transform and infrared analysis revealed the formation of hydrogen bond and peak shifting characteristics confirming the interaction of the neem oil with the polyurethane. Contact angle analysis showed the decrease in contact angle indicating the hydrophilic nature of the fabricated patch compared to pristine polyurethane. Thermal gravimetric analysis depicted the better thermal stability of the novel composite patch due to the existence of neem oil in the pristine polyurethane. The presence of neem oil in polyurethane matrix also resulted in an increase in the surface roughness as observed in the AFM analysis. The novel composite patch showed an ability to reduce the thrombogenicity and promoting the anticoagulant nature signified by blood compatibility assays like activated partial thromboplastin time and partial thromboplastin time. Finally, the haemolytic percentage of the fabricated composite (1%) was found to be reduced compared to control (2.733%) indicating better blood compatibility and safety with the red blood cells. Following the results, the fabricated patches offered enhanced physicochemical and blood compatible nature making it as a promising candidate for wound healing application.

scholarly journals Hydrophobically modified cotton fabric assisted separation of oil-water mixture

2021 ◽  
Author(s):  
Neha Bhatt ◽  
Abhilasha Mishra ◽  
Rekha Goswami
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Particle Size ◽  
Free Energy ◽  
Cotton Fabric ◽  
Water Mixture ◽  
Mixture Separation ◽  
Oil Water ◽  
Scanning Electron

Abstract Superhydrophobic-superoleophilic fabrics were prepared and evaluated for oil-water mixture separation efficiencies. The nano-TiO2 and nano- SiO2 based coatings were done on the surface of the cotton fabric to create nanoscale roughness over the surface which was further modified by low energy material 1, 1, 3, 3- Hexamethyldisilazane (HMDS) and, polydimethylsiloxane (PDMS). Particle size and stability of prepared sol were characterized by particle size analysis and zeta potential. Coated cotton fabric samples were characterized by contact angle, contact angle hesteresis and surface free energy for its hydrophobic nature. Surface morphology was studied by scanning electron microscopy (SEM). The coated fabrics were found hydrophobic with low surface free energy values. The maximum contact angle was found 133° and lowest contact angle hysteresis was 5°. Scanning electron microscopy (SEM) confirmed the appearance of nanoscale surface roughness after coating of sols on cotton fabric. The average particle size and zeta potential values of silica sol was 61 nm and 137 mv whereas for titania sol it was found 344 nm and 200 mv respectively. The oil/water separation efficiency of coated fabric was also observed by different oil-water mixture. The coatings were found hydrophobic in nature and seem to be very useful for water/oil mixture separation.

Super-Hydrophobic Properties of Unitary Structure

2014 ◽  
Vol 924 ◽  
pp. 212-216
Author(s):  
Jing Li ◽  
Cheng Yu Xu ◽  
Feng Du ◽  
Xian Li Liu ◽  
Hua Dong Yu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Lower Surface ◽  
Hydrophobic Property ◽  
Hydrophobic Properties ◽  
Lotus Leaf ◽  
Structure Characteristics ◽  
Biomimetic Surfaces ◽  
Scanning Electron

In this paper, the unitary structure characteristics and the super-hydrophobic properties of the lower surface of the lotus leaf and artificial biomimetic surfaces were investigated through scanning electron microscopy, field emission scanning electron microscopy, x-ray photoelectron spectroscopy and contact angle measurement. The measurement of wettability showed that artificial unitary structure surfaces modified with the lower surface energy material exhibit a super-hydrophobic property with a water contact angle of about 150°. The artificial structure characteristics and the super-hydrophobic properties are similar to those on the lower surface of the lotus leaf. The contribution mechanism of the unitary structure on the hydrophobic property was discussed for the surfaces of the lotus leaf and artificial biomimetic surfaces based on the Cassis-Baxter model.

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