Liquid paraffin

About: Liquid paraffin is a research topic. Over the lifetime, 6185 publications have been published within this topic receiving 52956 citations.

Fabrication and characterization of degradable and durable fluoride-free super-hydrophobic cotton fabrics for oil/water separation

Abstract: A simple and mild low-cost method for fabricating fluoride-free super-hydrophobic cotton fabrics is presented. The two-step method involves the decoration of the cotton fabrics by ZnO nano-rods to construct rough surface and the grafting of low surface energy stearic acid (SA) onto the as-decorated cotton fabrics via an immersion route. The as-prepared ZnO/SA modified cotton fabrics were characterized by X-ray powder diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, atomic force microscopy and Fourier transform infrared spectroscopy. The wetting behavior of coffee, milk, tea, water dyed by methylene blue, strong acid (HCl), strong alkali (NaOH), and saturated salt solution (NaCl) on the ZnO/SA modified cotton fabrics was evaluated with a contact angle tester, and the durability of the ZnO/SA modified cotton fabrics in corrosive liquids and under ultraviolet (UV) irradiation was tested. In addition, the oil/water separation efficiency of the ZnO/SA modified cotton fabrics towards the oil/water mixed solutions of n-hexane, liquid paraffin, dichloromethane, chloroform and motor oil with different density and viscosity was investigated; and their degradation rate under harsh conditions (e.g., immersion in acid and alkali or exposure to UV irradiation) was calculated. Results demonstrate that ZnO and SA are chemically bonded onto the surface of cotton fabrics to achieve super-hydrophobicity. The as-prepared ZnO/SA modified cotton fabrics exhibit a water contact angle of over 164°; and they retain the super-hydrophobicity after immersion in acid and alkali solutions or under UV irradiation. Besides, they have an oil/water separation efficiency of over 96.5% for all the tested liquids as well as a biodegradability rate of 59.0% after immersion in phosphate buffer saline solution containing cellulase (pH = 4.8) for 15 days. Therefore, the present approach could be applicable to constructing durable super-hydrophobic cotton fabrics with promising potential for oil/water separation in industry.

Facile Synthesis of Semiconductor and Noble Metal Nanocrystals in High-Boiling Two-Phase Liquid/Liquid Systems

Abstract: Novel high-boiling liquid/liquid systems were introduced for the synthesis of semiconductor and noble metal nanocrystals. Polyols and long-chain hydrocarbons were utilized to form such two-phase systems. Because of the high-boiling nature, these systems may be conveniently employed for nanocrystal synthesis at relatively high temperatures (under the normal pressure) and thus are useful alternatives to toluene/water. CdS and Ag nanocrystals were successfully prepared in an octadecene (ODE)/glycerol system via interfacial processes, demonstrating the effectiveness of this class of two-phase systems. As-prepared nanocrystals had hydrophobic surfaces and were dispersed in the ODE phase of the system. Furthermore, a congeneric two-phase system of liquid paraffin/glycerol was also found to be effective for the synthesis of CdS and Ag nanocrystals.

Preparation of microporous ultra high molecular weight polyethylene (uhmwpe) by thermally induced phase separation of a uhmwpe/liquid paraffin mixture *

Abstract: Ultra-high molecular weight polyethylene (UHMWPE) with a microporous structure was prepared via thermally induced phase separation (TIPS). Liquid paraffin (LP) was used as a diluent in the preparation of microporous UHMWPE. Small angle laser light scattering (SALLS) and differential scanning calorimetry (DSC) were used to determine the phase separation temperatures, i.e . the cloud points and the dynamic crystallization temperatures, respectively. It was found that the cloud points were coincident with the crystallization temperatures, indicating that a solid-liquid phase separation occurred during thermal quenching of the UHMWPE/LP solution, while, no liquid-liquid phase separation above the crystallization temperature was observed. The effects of the content and the molecular weight of UHMWPE on the morphology and average pore size were investigated with field emission scanning electron microscopy (FE-SEM) and mercury porosimetry. With the increase of the content of UHMWPE, the average pore size of the microporous material decreased and the molecular weight of UHMWPE could also influence the pore size slightly.

Setting phase change energy storage material with high-thermal conductivity and preparation method thereof

Abstract: The invention relates to a setting phase change energy storage material with high-thermal conductivity and a preparation method thereof, belonging to the field of phase change heat storage materials. The setting phase change energy storage material with high-thermal conductivity is characterized by containing 65-90 percent by mass of paraffin substances as a phase-change material, 9-34 percent by mass of high-density polyethylene as a support material and 1-7 percent by mass of expanded graphite as a heat conduction intensifier; a method for adding a proper amount of expanded graphite to paraffin/high-density polyethylene in a molten state is adopted to enable the heat conductivity of the setting phase change material to be increased to 1.35W/(m.K) or higher. The method comprises the following steps of: heating to melt the paraffin substances with the mass percent of 65-90 percent, and heating to enable the temperature of the liquid paraffin to reach 120-190 DEG C; adding high-density polyethylene with the mass percent of 9-34 percent and the expanded graphite with the mass percent of 1-7 percent to the liquid paraffin, and then melting and evenly stirring in vacuum; putting the mixture in a hot mould for pressing and molding; taking the mixture from the mould after naturally cooling. The setting phase change material has high thermal conductivity, does not need to be packaged in containers and can directly contact heat-transfer media.