15 research outputs found
Bioinspired in Situ Growth of Conversion Films with Underwater Superoleophobicity and Excellent Self-Cleaning Performance
Wax deposition during the production
and transportation of crude
oil is a global problem in oil industries. Fabrication of underwater
self-cleaning materials can provide a new strategy to prohibit wax
deposition. In this paper, conversion films on carbon steel with hierarchical
micro/nanostructure are fabricated through a novel in situ alternating-current
deposition method. The flower-like conversion films are composed of
amorphous iron phosphate and present superhydrophilicity in air and
superoleophobicity underwater. The conversion films can efficiently
prevent the deposition of wax in water-contained crude oil, showing
excellent self-cleaning performance. This facile and low-cost fabrication
of a self-cleaning film provides a good strategy for underwater–oil
prevention
Bioinspired in Situ Growth of Conversion Films with Underwater Superoleophobicity and Excellent Self-Cleaning Performance
Wax deposition during the production
and transportation of crude
oil is a global problem in oil industries. Fabrication of underwater
self-cleaning materials can provide a new strategy to prohibit wax
deposition. In this paper, conversion films on carbon steel with hierarchical
micro/nanostructure are fabricated through a novel in situ alternating-current
deposition method. The flower-like conversion films are composed of
amorphous iron phosphate and present superhydrophilicity in air and
superoleophobicity underwater. The conversion films can efficiently
prevent the deposition of wax in water-contained crude oil, showing
excellent self-cleaning performance. This facile and low-cost fabrication
of a self-cleaning film provides a good strategy for underwater–oil
prevention
Rapid Reversible Superhydrophobicity-to-Superhydrophilicity Transition on Alternating Current Etched Brass
Reversible surface wetting behavior
is a hot topic of research because of the potential engineering applications.
In the present work, a hierarchical micro/nanostructure is fabricated
on brass by alternate current (AC) etching. The superhydrophilic as-prepared
etched brass (EB) turns into superhydrophobic after the modification
of stearic acid for 1 min. After annealing at 350 °C for 5 min,
the superhydrophobic modified EB surface becomes superhydrophilic
again. Furthermore, the annealed EB can restore the superhydrophobicity
with the remodification of stearic acid. The wetting transition is
realized by stearic acid modification and annealing rapidly in 6 min.
The wetting transition mechanism is discussed based on the surface
chemical analysis. This method is facile and suitable for the construction
of large-scale and complex brass surfaces with tunable wetting behaviors
Bioinspired in Situ Growth of Conversion Films with Underwater Superoleophobicity and Excellent Self-Cleaning Performance
Wax deposition during the production
and transportation of crude
oil is a global problem in oil industries. Fabrication of underwater
self-cleaning materials can provide a new strategy to prohibit wax
deposition. In this paper, conversion films on carbon steel with hierarchical
micro/nanostructure are fabricated through a novel in situ alternating-current
deposition method. The flower-like conversion films are composed of
amorphous iron phosphate and present superhydrophilicity in air and
superoleophobicity underwater. The conversion films can efficiently
prevent the deposition of wax in water-contained crude oil, showing
excellent self-cleaning performance. This facile and low-cost fabrication
of a self-cleaning film provides a good strategy for underwater–oil
prevention
Constructing Fluorine-Free and Cost-Effective Superhydrophobic Surface with Normal-Alcohol-Modified Hydrophobic SiO<sub>2</sub> Nanoparticles
Superhydrophobic
coatings have drawn much attention in recent years for their wide
potential applications. However, a simple, cost-effective, and environmentally
friendly approach is still lacked. Herein, a promising approach using
nonhazardous chemicals was proposed, in which multiple hydrophobic
functionalized silica nanoparticles (SiO<sub>2</sub> NPs) were first
prepared as core component, through the efficient reaction between
amino group containing SiO<sub>2</sub> NPs and the isocyanate containing
hydrophobic surface modifiers synthesized by normal alcohols, followed
by simply spraying onto various substrates for superhydrophobic functionalization.
Furthermore, to further improve the mechanical durability, an organic–inorganic
composite superhydrophobic coating was fabricated by incorporating
cross-linking agent (polyisocyanate) into the mixture of hydrophobic-functionalized
SiO<sub>2</sub> NPs and hydroxyl acrylic resin. The hybrid coating
with cross-linked network structures is very stable with excellent
mechanical durability, self-cleaning property and corrosion resistance
Hybrid energy harvesting technology: From materials, structural design, system integration to applications
© 2020 Elsevier Ltd The last decade has witnessed significant advances in energy harvesting technology for the realization of self-charging electronics and self-powered wireless sensor nodes (WSNs). To conquer the energy-insufficiency issue of a single energy harvester, hybrid energy harvesting systems have been proposed in recent years. Hybrid harvesting includes not only scavenging energy from multiple sources, but also converting energy into electricity by multiple types of transduction mechanisms. A reasonable hybridization of multiple energy conversion mechanisms not only improves the space utilization efficiency but can also boost the power output significantly. Given the continuously growing trend of hybrid energy harvesting technology, herein we present a comprehensive review of recent progress and representative works, especially focusing on vibrational and thermal energy harvesters which play the dominant role in hybrid energy harvesting. The working principles and typical configurations for piezoelectric, electromagnetic, triboelectric, thermoelectric and pyroelectric transduction effects are briefly introduced. On this basis, a variety of hybrid energy harvesting systems, including mechanisms, configurations, output performance and advantages, are elaborated. Comparisons and perspectives on the effectiveness of hybrid vibrational and thermal harvesters are provided. A variety of potential application prospects of the hybrid systems are discussed, including infrastructure health monitoring, industry condition monitoring, smart transportation, human healthcare monitoring, marine monitoring systems, and aerospace engineering, towards the future Internet-of-Things (IoT) era
Facile Fabrication of Binary Nanoscale Interface for No-Loss Microdroplet Transportation
Binary
nanoscale interfacial materials are fundamental issues in
many applications for smart surfaces. A binary nanoscale interface
with binary surface morphology and binary wetting behaviors has been
prepared by a facile wet-chemical method. The prepared surface presents
superhydrophobicity and high adhesion with the droplet at the same
time. The composition, surface morphology, and wetting behaviors of
the prepared surface have been systematic studied. The special wetting
behaviors can be contributed to the binary nanoscale effect. The stability
of the prepared surface was also investigated. As a primary application,
a facile device based on the prepared binary nanoscale interface with
superhydrophobicity and high adhesion was constructed for microdroplet
transportation
Bioinspired Composite Coating with Extreme Underwater Superoleophobicity and Good Stability for Wax Prevention in the Petroleum Industry
Wax deposition is a detrimental problem
that happens during crude oil production and transportation, which
greatly reduces transport efficiency and causes huge economic losses.
To avoid wax deposition, a bioinspired composite coating with excellent
wax prevention and anticorrosion properties is developed in this study.
The prepared coating is composed of three films, including an electrodeposited
Zn film for improving corrosion resistance, a phosphating film for
constructing fish-scale morphology, and a silicon dioxide film modified
by a simple spin-coating method for endowing the surface with superhydrophilicity.
Good wax prevention performance has been investigated in a wax deposition
test. The surface morphology, composition, wetting behaviors, and
stability are systematically studied, and a wax prevention mechanism
is proposed, which can be calculated from water film theory. This
composite coating strategy which shows excellent properties in both
wax prevention and stability is expected to be widely applied in the
petroleum industry
Electrodeposition of Polyporous Sn–Ni Coating in Deep Eutectic Solvents for Removing Organic Dyes
Materials with a high specific surface area including
a porous
structure have been widely researched due to the applicability in the adsorption of various organic dyes.
However, further application of porous materials is limited by the
complicated and expensive preparation process. Herein, a Sn–Ni
coating with a polyporous structure is successfully prepared via a
simple and high-efficiency electrodeposition approach in deep eutectic
solvents (DESs). The prepared Sn–Ni coating exhibits a uniform
polyporous structure with a diameter of 15 ÎĽm. Furthermore,
the coating shows excellent adsorption capacity in the removal of
acid grain black organic dyestuff. With the rise of preparation temperature
from 85 to 105 °C, the electrochemical active surface area and
the ratio of nickel increase, which further enhance dye adsorption
capacity
Carbon-Based CsPbBr<sub>3</sub> Perovskite Solar Cells: All-Ambient Processes and High Thermal Stability
The device instability
has been an important issue for hybrid organic–inorganic halide
perovskite solar cells (PSCs). This work intends to address this issue
by exploiting inorganic perovskite (CsPbBr<sub>3</sub>) as light absorber,
accompanied by replacing organic hole transport materials (HTM) and
the metal electrode with a carbon electrode. All the fabrication processes
(including those for CsPbBr<sub>3</sub> and the carbon electrode)
in the PSCs are conducted in ambient atmosphere. Through a systematical
optimization on the fabrication processes of CsPbBr<sub>3</sub> film,
carbon-based PSCs (C-PSCs) obtained the highest power conversion efficiency
(PCE) of about 5.0%, a relatively high value for inorganic perovskite-based
PSCs. More importantly, after storage for 250 h at 80 °C, only
11.7% loss in PCE is observed for CsPbBr<sub>3</sub> C-PSCs, significantly
lower than that for popular CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> C-PSCs (59.0%) and other reported PSCs, which indicated a promising
thermal stability of CsPbBr<sub>3</sub> C-PSCs