Martin Andresen

Streamer Inception Probability in Air - How the Polarity Dependence is Affected by Changes in the Shape of the Applied Voltage Impulse

Fanny Skirbekk, Martin Andresen, Frank Mauseth

In this research, the influence of the rise time of the applied voltage pulse on the polarity dependence for streamer inception probability in air is studied. This was done for a needle-plane electrode configuration at 1 bar absolute pressure, where the streamers …

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Sustainable Calcite Scale Inhibitors via Oxidation of Lignosulfonates

Šumit Ganguly, Malcolm A. Kelland, Ross J. Ellis, Martin Andresen et autres

Deposition of inorganic scales in wells, flow lines, and equipment is a major problem in the water treatment, geothermal, or upstream oil and gas industries. Deployment of scale inhibitors has been adopted worldwide for oilfield scale prevention. Commercial synthetic scale inhibitors such …

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Lignosulfonate-Based Calcite Scale Inhibitors for Topside and Downhole Applications

Šumit Ganguly, Malcolm A. Kelland, Ross J. Ellis, Martin Andresen et autres

Abstract Scale inhibitors (SI) are widely used in upstream oil and gas industries to prevent insoluble inorganic salts from depositing near or inside the production well or in flow lines. Commercial scale inhibitors like polyacrylates or polyvinylsulfonate offer good calcite scale inhibition, …

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Preparation, Properties and Chemical Modification of Nanosized Cellulose Fibrils

Per Stenius, Martin Andresen

This chapter contains sections titled: Introduction Microfibrillar Cellulose Preparation of Microfibrillar and Nanocrystalline Cellulose Methods Used to Characterize Cellulose Microfibrils Modification of Microfibril Surfaces Applications of Nanofibrillar Cellulose Concluding Remarks References

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Chemical surface modifications of microfibrillated cellulose

Per Stenstad, Martin Andresen, Bjørn Steinar Tanem, Per Stenius

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Water‐in‐oil Emulsions Stabilized by Hydrophobized Microfibrillated Cellulose

Martin Andresen, Per Stenius

The properties of water‐in‐toluene emulsions stabilized solely by hydrophobized microfibrillated cellulose (MFC) were investigated. By varying the degree of surface substitution (DSS), the wettability of the MFC was altered. All emulsions prepared with MFC displayed excellent stability to coalescence. The stability to …

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Nonleaching Antimicrobial Films Prepared from Surface-Modified Microfibrillated Cellulose

Martin Andresen, Per Stenstad, Trond Møretrø, Solveig Langsrud et autres

We have prepared potentially permanent antimicrobial films based on surface-modified microfibrillated cellulose (MFC). MFC, obtained by disintegration of bleached softwood sulfite pulp in a homogenizer, was grafted with the quaternary ammonium compound octadecyldimethyl(3-trimethoxysilylpropyl)ammonium chloride (ODDMAC) by a simple adsorption-curing process. Films prepared …

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Properties and characterization of hydrophobized microfibrillated cellulose

Martin Andresen, Leena‐Sisko Johansson, Bjørn Steinar Tanem, Per Stenius

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Safranin und Methylenblau

Martin Andresen

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