Fabrication of a superhydrophobic surface on copper foil based on ammonium bicarbonate and paraffin wax coating

The grease resistance of a wide variety of packaging materials was tested before and after creasing and ageing, using a modification of TAPPI method T454 m-44. Kraft and sulphite were of little or no value as grease barriers even after paraffin wax coating or impregnating. Vegetable parchment and 'greaseproof' paper were superior to kraft. The grease resistance of glassine was 5 to 10 times greater than that of either greaseproof paper or vegetable parchment. Polyethylene, in turn, was considerably more resistant than glassine, and just slightly less resistant than all grades of "Cellophane", and cellulose acetate, cellulose nitrate, ethyl cellulose, Pliofilm, vinylite, and Saran.Creasing glassine caused large reductions in its grease resistance, especially when heavy basis weights were tested. Paraffin wax coatings seemed to be more effective in improving grease resistance when dense base stocks were used. On kraft, a heavy wax coating was necessary to produce a small improvement, while on glassine only a very light coating was required, to bring about considerable improvement in grease resistance. Ageing many materials at 140° F. markedly reduced their grease resistance. An exception to this was glassine, most samples of which had greater resistance to grease penetration after ageing. Neither ageing nor creasing appreciably affected the grease resistance of Cellophane, or the thermoplastic films tested.

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Rapid physical preparation of a superhydrophobic surface on copper foil without low-surface-energy materials coating

Materials Express ◽

10.1166/mex.2021.1875 ◽

2021 ◽

Vol 11 (1) ◽

pp. 93-99

Author(s):

Jian Wang ◽

Hong Chen ◽

Xinyuan Li

Keyword(s):

Surface Energy ◽

Superhydrophobic Surface ◽

Copper Foil ◽

Traditional Approach ◽

Substrate Surface ◽

Copper Surface ◽

Energy Materials ◽

New Approach ◽

Low Surface Energy ◽

Physical Preparation

A method is proposed to directly obtain superhydrophobic properties by depositing a coating made of candle soot upon the copper foil surface. The process to prepare a surface of superhydrophobicity is simple and rapid, which was performed just by placing the copper foil over the flame of a burned candle for no more than 10 minutes. The surface contact and slide angles of water were 159° ± 1.8° and 2°, respectively. Furthermore, the wettability on the copper surface of superhydrophobicity was also investigated. We found that the copper superhydrophobic surface prepared by the method had excellent superhydrophobicity for water; acid, alkali and salt solutions; and other liquids. In contrast to the traditional approach to prepare superhydrophobic surfaces, the method proposed in this study not only did not damage the mechanical properties of the substrate surface but also did not require low surface energy materials to be modified. This study provides a new approach for the protection of copper and other metallic materials.

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X-ray microtomography to evaluate the efficacy of paraffin wax coating for soil bulk density evaluation

Geoderma ◽

10.1016/j.geoderma.2018.11.017 ◽

2019 ◽

Vol 337 ◽

pp. 935-944 ◽

Cited By ~ 4

Author(s):

Luiz F. Pires ◽

Sacha J. Mooney ◽

André C. Auler ◽

Brian Atkinson ◽

Craig J. Sturrock

Keyword(s):

Bulk Density ◽

Soil Bulk Density ◽

Paraffin Wax ◽

X Ray ◽

Density Evaluation ◽

Wax Coating

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Carbon Nanotube Array Thermal Interfaces Enhanced With Paraffin Wax

Heat Transfer: Volume 2 ◽

10.1115/ht2008-56483 ◽

2008 ◽

Cited By ~ 11

Author(s):

Baratunde A. Cola ◽

Stephen L. Hodson ◽

Xianfan Xu ◽

Timothy S. Fisher

Keyword(s):

Carbon Nanotube ◽

Paraffin Wax ◽

Nanotube Array ◽

Carbon Nanotube Array ◽

Real Contact ◽

Cnt Arrays ◽

Sample Structure ◽

Individual Cnts ◽

Thermal Interfaces ◽

Wax Coating

Vertically oriented carbon nanotube (CNT) arrays can increase real contact in thermal interfaces and efficiently transfer heat between the mating solids. In this study, a paraffin wax that changes phase at approximately 50°C was applied to interfaces with CNT arrays directly synthesized on one side of the interface, and to foil/CNT interfaces with CNT arrays directly synthesized on one side and both sides of the foil. The bulk thermal resistances of single-sided CNT array/wax interfaces were measured using a transient photoacoustic (PA) technique to range from approximately 2 to 3 mm2·K/W under moderate pressures. The bulk thermal resistances of foil/CNT/wax interfaces were measured with the PA technique to range from approximately 10 to 20 mm2·K/W under moderate pressures. For each sample structure, the addition of paraffin wax to the CNT arrays produced significant reductions in thermal resistance. We surmise that this improved thermal performance could be a function of the wettability of paraffin wax to CNTs. A hydrophilic wetting angle of approximately 47° was observed at the interface of liquid wax and the free tips of a CNT array at 60°C, and field-emission scanning electron microscope images taken after PA testing revealed individual CNTs that were blanketed with a wax coating.

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Fast Preparation of a Superhydrophobic Surface with Anti-corrosion Property on a Copper Foil

The 21st IAPRI World Conference on Packaging ◽

10.12783/iapri2018/24459 ◽

2018 ◽

Author(s):

ZHIQING YUAN ◽

YU CHEN ◽

CANLIANG MO ◽

XIAN WANG ◽

MENGLEI WANG ◽

...

Keyword(s):

Superhydrophobic Surface ◽

Copper Foil ◽

Corrosion Property

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UV-resistant superhydrophobic surface on copper foil

10.1063/1.5100464 ◽

2019 ◽

Cited By ~ 1

Author(s):

Sandip Wadhai ◽

Anurag Kanase ◽

Rajashree Deokar ◽

Pranjali Yedewar ◽

Arun Banpurkar

Keyword(s):

Superhydrophobic Surface ◽

Copper Foil

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Fibrillin molecules aggregate to form an extendible beaded structure which is a major component of “Elastin Associated” microfibrils

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100153208 ◽

1989 ◽

Vol 47 ◽

pp. 246-247

Author(s):

Douglas R. Keene ◽

B. Kerry Maddox ◽

Marie B. Spurgin ◽

Lynn Y. Sakai ◽

Robert W. Glanville

Keyword(s):

Molecular Sieve ◽

Room Temperature ◽

Culture Medium ◽

Weight Fraction ◽

Ammonium Bicarbonate ◽

High Molecular Weight Fraction ◽

Bicarbonate Buffer ◽

Human Amnion ◽

Gold Conjugate ◽

Ammonium Bicarbonate Buffer

A mouse monoclonal antibody was used to identify beaded aggregates found in guanidine extracts of human amnion as assemblies of fibrillin molecules. These aggregates were also shown to be a major component of extracellular matrix microfibrils. We further demonstrated that the periodicity of these aggregates can be increased when subjected to mechanical stress.Human amnion was extracted with guanidine and the extracted material purified using ion exchange and molecular sieve chromatography. A high molecular weight fraction was precipitated by dialyzing against dilute acetic acid. Part of the precipitate was suspended in 0.2 M ammonium bicarbonate buffer and rotary shadowed. A second portion was resuspended in culture medium containing antibody which recognizes matrix microfibrils, diluted 1:5 in ammonium bicarbonate and reacted for 120 minutes at room temperature. Antibody labeled precipitate was washed by repeated pelleting and resuspension in buffer and then incubated in Janssen GAM 5 nm gold conjugate for 60 minutes at room temperature.

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