Multialkylated cyclopentanes (MACs), a class of synthetic hydrocarbon fluid have attracted intensive interest as possible space lubricants due to a series of unique physical and chemical properties. Here, we used graphene with high mechanical strength and chemical inertness as lubricant additive to explore its potential for space application. The effects of space irradiation on graphene and the...

deprotection of phosphate, phosphate, and sulfite esters by silica chloride is described. silica chloride is a mild, selective, and effective reagent for cleavage of benzyl and t-butyl esters of the above compounds.

Sutures are used to close the cuts caused by injuries or to close the incision due to surgery and other medical procedures like wound approximation. They are commonly used on the skin, internal tissues, organs and blood vessels. They are available in the form of monofilament, multifilament/braided and pseudo monofilament. A lubricant is applied on the surface of braided suture material to lower...

Abstract Molybdenum disulfide (MoS 2 ) is an effective friction modifier that can be formed on surfaces from oil-soluble lubricant additives. Different additive chemistries used to form MoS a surface. The tribofilms three different molybdenum additives (MoDTC Dimer, MoDTC Trimer, and molybdate ester) were studied in monoblends fully formulated systems. resulting then characterized by Raman spec...

This work investigated the lubricating and anti-wear properties of several sulfur additives for a nickel-based superalloy–tungsten carbide friction pair. Compared with PAO40 without any active chemical compounds, three kinds could decrease coefficient from 0.2 to 0.1 wear volume by 90%. Sulfurized fatty acid ester had best performance under high temperature heavy load COF below smallest volume....

The objective was to evaluate the impact of additional lubricant on condom breakage and slippage. Two hundred and sixty-eight couples used 6 new and 6 aged condoms during vaginal intercourse and were instructed to use 2 of each type with either water-based lubricant, oil-based lubricant or no additional lubricant. The use of either oil-based or water-based lubricant increased slippage rates of ...

This paper presents a synthesis of sweet almond oil-based trimethylolpropane biolubricant and the evaluation its temperature-dependent viscosity properties. The oil was converted into biodiesel by transesterification process after extraction, refining, acid-alkaline transesterification. After that, produced further transesterifying with at 105 oC ratio 3.9:1 for 60-minute reaction time potassiu...

In a previous study of the characteristics of acyl derivatives of polyhydroxy milkweed oil (PHMWO), it was observed that the densities and viscosities of the respective derivatives decreased with increased chain length of the substituent acyl group. Thus from the polyhydroxy starting material, attenuation in viscosity of the derivatives relative to PHMWO was found in the order: PHMWO ≫ PAcMWE ≫...

In this work, six different types of protic ionic liquids (PILs) have been studied. For all these PILs, the bacteria toxicity and environmental biodegradability investigated, as well their corrosive behavior miscibility in lubricating base oils. The PILs studied showed poor to moderate (BOD5/COD from 0.072 ± 0.002 0.18 0.01) slight (TU values between 1.18 0.04 2.7 0.1). However, properties are ...