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288,259
result(s) for
"Brushes"
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Traction Man is here!
Traction Man, a boy's courageous action figure, has a variety of adventures with Scrubbing Brush and other objects in the house.
BOOK
Tribological performance of ionic liquid-lubricated carbon brush/collector ring current-carrying friction system
The lubricity and anti-wear ability of ionic liquids (ILs) were studied by a current-carrying friction test on IL-lubricated carbon brushes. The results indicated that the conductivity and wear resistance of different ILs are different, and may vary for different carbon brushes. The E468e carbon brush was found to be more sensitive to IL lubrication than D172 carbon brush. Importantly, an analysis of the wear surfaces of the D172 and E468e carbon brushes revealed that, due to the different materials of the two carbon brushes and the composition of the IL, the lubrication effect on the carbon brushes was different. The viscosity of the IL will affect its wettability on the carbon brush surface. The better the wettability, the easier the movement of ions on the surface, which makes it easier to form a conductive physical adsorption film. Therefore, in practice, a better IL must be selected by considering the wettability of IL and carbon brushes.
Journal Article
The lost broomstick
Although Tess's lost broomstick is found several times, no one can ride it except her--and, perhaps, her cat Cass.
BOOK
Dipolar Brush Polymers: A Numerical Study of the Force Exerted onto a Penetrating Colloidal Particle Under an External Field
Langevin Dynamics numerical simulations have been used to compute the force profiles that dipolar polymer brushes exert onto a penetrating colloidal particle. It has been observed that force profiles are strongly influenced by externally applied fields: at large distances from the grafting surface, a force barrier appears, and at shorter distances a region with lower repulsive forces develops. Furthermore, with the right combination of polymer grafting density, polymer chain length and strength of the external field, it is possible to observe in this intermediate region both the existence of net attractive forces onto the penetrating particle and the emergence of a stationary point. The existence of these regions of low repulsive or net attractive forces inside the dipolar brushes, as well as their dependence on the different parameters of the system can be qualitatively reasoned in terms of a competition between steric repulsion forces and Kelvin forces arising from the dipolar mismatch between different regions of the system. The possibility to tune force profile features such as force barriers and stationary points via an external field paves the way for many potential surface–particle-related applications.
Journal Article
Room on the broom
The witch and her cat fly happily over forests, rivers and mountains on their broomstick until a stormy wind blows away the witch's hat, bow and wand. Luckily, they are retrieved by a dog, a bird and a frog, who are all keen for a ride on the broom. It's a case of the more, the merrier, but the broomstick isn't used to such a heavy load and it's not long before ... SNAP! It breaks in two! And with a greedy dragon looking for a snack, the witch's animal pals better think fast. A very funny story of quick wits and riendship, The Room on the Broom is another smash hit from the unparalleled picture-book partnership of Julia Donaldson and Axel Scheffler, creators of The Gruffalo. Ages 0+
Increasing the performance and service life of the brushes of the cotton gin under conditions of shock-bending loads
The purpose of this paper is to increase the service life of the brushes in the interaction of the puller brushes and the drum when cleaning cotton from large debris during the cotton removal process. The authors conducted an experimental study to determine the actual value of the number of impacts (touches) of the puller brushes on the surface of the saw drum. The angle of rotation of the serrated drum around its axis during the period of influence of the puller brushes on it was determined. The paper also describes determination of the average number of blows (touches) of the puller brushes on the saw drum.
Journal Article
Ellen's broom
Ellen has always known that the broom hanging on her family's cabin wall is a special symbol of her parents' wedding during slave days, so she proudly carries it to the courthouse when the marriage becomes legal.
BOOK
Super‐Slippery Poly(Dimethylsiloxane) Brush Surfaces: From Fabrication to Practical Application
Superwetting surfaces with special slippery performances have been the focus of practical applications and basic research for decades. Compared to superhydrophobic/superoleophobic and slippery liquid‐infused porous surfaces (SLIPS), liquid‐like covalently attached poly(dimethylsiloxane) (PDMS) brush surfaces have no trouble in constructing the micro/nanostructure and the loss of infused lubricant, meanwhile, it can also provide lots of new advantages, such as smooth, transparent, pressure‐ and temperature‐resistant, and low contact angle hysteresis (CAH) to diverse liquids. This paper focuses on the relationship between the wetting performance and practical functional application of PDMS brush surfaces. Recent progress of the preparation of PDMS brush surfaces and their super‐slippery performances, with a special focus on diverse functional applications were summarized. Finally, perspectives on future research directions are also discussed. Superwetting surfaces with special slippery performances have been the focus of practical applications and basic research for decades. Liquid‐like covalently attached poly(dimethylsiloxane) (PDMS) brush surfaces enable smooth, transparent, pressure‐ and temperature‐resistant, and low adhesion to diverse liquids. This paper focuses on the relationship between the wetting performance and practical functional application of PDMS brush surfaces.
Journal Article
Superhydrophobic photothermal icephobic surfaces based on candle soot
Ice accumulation causes various problems in our daily life for human society. The daunting challenges in ice prevention and removal call for novel efficient antiicing strategies. Recently, photothermal materials have gained attention for creating icephobic surfaces owing to their merits of energy conservation and environmental friendliness. However, it is always challenging to get an ideal photothermal material which is cheap, easily fabricating, and highly photothermally efficient. Here, we demonstrate a low-cost, high-efficiency superhydrophobic photothermal surface, uniquely based on inexpensive commonly seen candle soot. It consists of three components: candle soot, silica shell, and polydimethylsiloxane (PDMS) brushes. The candle soot provides hierarchical nano/microstructures and photothermal ability, the silica shell strengthens the hierarchical candle soot, and the grafted low-surface-energy PDMS brushes endow the surface with superhydrophobicity. Upon illumination under 1 sun, the surface temperature can increase by 53 °C, so that no ice can form at an environmental temperature as low as −50 °C and it can also rapidly melt the accumulated frost and ice in 300 s. The superhydrophobicity enables the melted water to slide away immediately, leaving a clean and dry surface. The surface can also self-clean, which further enhances its effectiveness by removing dust and other contaminants which absorb and scatter sunlight. In addition, after oxygen plasma treatment, the surface can restore superhydrophobicity with sunlight illumination. The presented icephobic surface shows great potential and broad impacts owing to its inexpensive component materials, simplicity, ecofriendliness, and high energy efficiency.
Journal Article
A robust all-organic protective layer towards ultrahigh-rate and large-capacity Li metal anodes
The low cycling efficiency and uncontrolled dendrite growth resulting from an unstable and heterogeneous lithium–electrolyte interface have largely hindered the practical application of lithium metal batteries. In this study, a robust all-organic interfacial protective layer has been developed to achieve a highly efficient and dendrite-free lithium metal anode by the rational integration of porous polymer-based molecular brushes (poly(oligo(ethylene glycol) methyl ether methacrylate)-grafted, hypercrosslinked poly(4‐chloromethylstyrene) nanospheres, denoted as
x
PCMS-
g
-PEGMA) with single-ion-conductive lithiated Nafion. The porous
x
PCMS inner cores with rigid hypercrosslinked skeletons substantially increase mechanical robustness and provide adequate channels for rapid ionic conduction, while the flexible PEGMA and lithiated Nafion polymers enable the formation of a structurally stable artificial protective layer with uniform Li
+
diffusion and high Li
+
transference number. With such artificial solid electrolyte interphases, ultralong-term stable cycling at an ultrahigh current density of 10 mA cm
−2
for over 9,100 h (>1 year) and unprecedented reversible lithium plating/stripping (over 2,800 h) at a large areal capacity (10 mAh cm
−2
) have been achieved for lithium metal anodes. Moreover, the protected anodes also show excellent cell stability when paired with high-loading cathodes (~4 mAh cm
−2
), demonstrating great prospects for the practical application of lithium metal batteries.
A robust all-organic interfacial protective layer towards ultrahigh-rate and large-capacity Li metal anodes is proposed by rational integration of porous polymer-based molecular brushes with single-ion-conductive lithiated Nafion.
Journal Article