Light Stimuli-Responsive Superhydrophobic Films for Electric Switches and Water-Droplet Manipulation

2021 ◽  
Author(s):  
Longzhu Zheng ◽  
Hongqiang Li ◽  
Wei Huang ◽  
Xuejun Lai ◽  
Xingrong Zeng
Keyword(s):  
Water Droplet ◽  
Stimuli Responsive ◽  
Light Stimuli ◽  
Droplet Manipulation

Large-Area Fabrication of Superhydrophobic Micro-Conical Pillar Arrays on Various Metallic Substrates

Nanoscale ◽  
2021 ◽  
Author(s):  
Weihao Pan ◽  
Song Wu ◽  
Liu Huang ◽  
Jinlong Song
Keyword(s):  
Corrosion Resistance ◽  
Water Droplet ◽  
Large Area ◽  
Water Separation ◽  
Metallic Substrates ◽  
Pillar Arrays ◽  
Oil Water Separation ◽  
Oil Water ◽  
Droplet Manipulation ◽  
Application Prospects

Superhydrophobic micro-conical pillar arrays have huge application prospects, from anti-icing to oil/water separation, corrosion resistance, and water droplet manipulation. However, there is still a lack of versatile methods with high...

scholarly journals Light-triggered reversible disassembly of stimuli-responsive coordination metallosupramolecular Pd2L4 cages mediated by azobenzene-containing ligands

2019 ◽  
Vol 3 (6) ◽  
pp. 1238-1243 ◽  
Author(s):  
Shuang Fu ◽  
Quan Luo ◽  
Mingsong Zang ◽  
Jun Tian ◽  
Zherui Zhang ◽  
...  
Keyword(s):  
Uv Light ◽  
Light Irradiation ◽  
Stimuli Responsive ◽  
Uv Light Irradiation ◽  
Light Stimuli ◽  
Azo Ligand

A light-stimuli-responsive supramolecular azobenzene-containing M2L4 cage has been designed and synthesized. This cage can be reversibly disassembled/reassembled mediated by the azo-ligand under visible and UV light irradiation.

scholarly journals A Magnetically Actuated Superhydrophobic Ratchet Surface for Droplet Manipulation

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 325
Author(s):  
ChangHee Son ◽  
BingQiang Ji ◽  
JunKyu Park ◽  
Jie Feng ◽  
Seok Kim
Keyword(s):  
Pressure Gradient ◽  
Water Droplet ◽  
Laplace Pressure ◽  
Black Silicon ◽  
Magnetically Actuated ◽  
Fabrication Procedure ◽  
Asymmetric Shape ◽  
Droplet Manipulation ◽  
The Impact ◽  
Two Sides

A water droplet dispensed on a superhydrophobic ratchet surface is formed into an asymmetric shape, which creates a Laplace pressure gradient due to the contact angle difference between two sides. This work presents a magnetically actuated superhydrophobic ratchet surface composed of nanostructured black silicon strips on elastomer ridges. Uniformly magnetized NdFeB layers sputtered under the black silicon strips enable an external magnetic field to tilt the black silicon strips and form a superhydrophobic ratchet surface. Due to the dynamically controllable Laplace pressure gradient, a water droplet on the reported ratchet surface experiences different forces on two sides, which are explored in this work. Here, the detailed fabrication procedure and the related magnetomechanical model are provided. In addition, the resultant asymmetric spreading of a water droplet is studied. Finally, droplet impact characteristics are investigated in three different behaviors of deposition, rebound, and penetration depending on the impact speed. The findings in this work are exploitable for further droplet manipulation studies based on a dynamically controllable superhydrophobic ratchet surface.

scholarly journals MOLECULAR SWITCH BASED ON BITHIOPHENE-AZOBENZENE: HOW TO CONTROL CONDUCTANCE THROUGH THE MONOLAYER USING LIGHT

2021 ◽  
pp. 7-20
Author(s):  
Владислав Анатольевич Савченко ◽  
Ольга Александровна Гуськова
Keyword(s):  
Density Functional ◽  
Rational Design ◽  
Molecular Design ◽  
Uv Light ◽  
Light Stimulus ◽  
Gold Cluster ◽  
Stimuli Responsive ◽  
Anchor Group ◽  
Light Stimuli ◽  
Conductance Ratio

Молекулярные переключатели на основе азобензола (азо) являются светочувствительными молекулами, которые могут переключаться между двумя конфигурационными состояниями под действием света. Светочувствительные азо -монослои можно использовать для модуляции работы выхода, то есть они влияют на свойства электродов. В данной работе мы отвечаем на вопрос, что происходит со структурами, электронными свойствами и перераспределением заряда в монослоях азобитиофена (азо-бт) в зависимости от светового стимула, используя теорию функционала плотности. Моделируются два типа переключателей, различающихся расположением азо и бт от группы пришивки молекулы к поверхности: азо-бт и бт-азо . Один из них (бт-азо) описан в литературе, другой же является продуктом молекулярного дизайна. Мы описываем транс- и цис-изомеры для каждого переключателя, находящегося в контакте с кластером золота. Наше моделирование объясняет гигантское соотношение в проводимости ON/OFF-состояний при воздействии УФ-излучения на монослой улучшенной электронной связью между цис-изомерами (состояние ON) и кластером золота. Транс-изомеры же (OFF состояние) моделируемых переключателей играют роль изоляторов. Кроме того, мы показываем, какие именно свойства улучшаются после молекулярного дизайна. Данное исследование открывает новые возможности в разработке инновационных модификаций поверхности электродов. Molecular switches based on azobenzene (azo) are defined as light-responsive molecules which can change between two configurational states under light stimuli. Responsive azo monolayers can be used to modulate the work function, i.e. they tune the properties of the interfaces at the electrodes. In this work, we investigate what happens to the structures, electronic properties, and the charge redistribution within azo-bithiophene (azo-bt) monolayers depending on the light stimulus using density functional theory. Two types of switches differing in the order of azo and bt counting from the anchor group are modelled: azo-bt and bt-azo . One of them (bt-azo) is known from the literature, the remaining one is a product of rational design. We describe trans- and cis-isomers for each switch being in a contact with a gold cluster. Our simulations explain a giant ON/OFF conductance ratio upon UV light stimulus by improved electronic coupling between the cis-isomers (ON-state) and the gold cluster. The trans-isomers (OFF-state) of the simulated switches play the role of the insulators. Moreover, we show which molecular properties are enchanced by molecular design. This study opens up new avenues to the development of the innovative design of electrode surface modifications.

Design of core–shell magnetic mesoporous silica hybrids for pH and UV light stimuli-responsive cargo release

RSC Advances ◽  
2016 ◽  
Vol 6 (35) ◽  
pp. 29106-29115 ◽  
Author(s):  
Madhappan Santha Moorthy ◽  
Hak-Bong Kim ◽  
Jae-Ho Bae ◽  
Sun-Hee Kim ◽  
Chang-Sik Ha
Keyword(s):  
Targeted Delivery ◽  
Uv Light ◽  
Drug Carrier ◽  
Core Shell ◽  
Stimuli Responsive ◽  
Carrier System ◽  
Light Stimuli ◽  
Silica Hybrids ◽  
Drug Carrier System ◽  
Magnetic Mesoporous Silica

The drug carrier system proposed here efficiently works under UV light and pH triggers for controlled release of model cargoes. The nanocarrier can be used in the targeted delivery of cargoes by the ‘ON’ and ‘OFF’ command by the UV light trigger.

scholarly journals Self-assembly of photoresponsive azo-containing phospholipids with a polar group as the tail

RSC Advances ◽  
2020 ◽  
Vol 10 (54) ◽  
pp. 32984-32991
Author(s):  
Su Ma ◽  
Seiji Kurihara ◽  
Yasuhiro Tomimori ◽  
Sunnam Kim ◽  
Eunsang Kwon ◽  
...  
Keyword(s):  
Visible Light ◽  
Self Assembly ◽  
Polar Group ◽  
Stimuli Responsive ◽  
Light Stimuli ◽  
Responsive Behavior

A mixture of a nitro- and methoxy-substituted azo-containing phospholipids without long alkyl tails formed vesicles showing visible light stimuli-responsive behavior. Release of encapsulated calcein from the vesicles was triggered by visible light.

Electrostatically-induced trajectory switching system on a multi-inlet-multi-outlet superhydrophobic droplet guiding track

RSC Advances ◽  
2015 ◽  
Vol 5 (8) ◽  
pp. 5754-5761 ◽  
Author(s):  
Soonil Lee ◽  
Seulah Lee ◽  
Dayeong Kim ◽  
Jungmok Seo ◽  
Chandreswar Mahata ◽  
...  
Keyword(s):  
Water Droplet ◽  
Electrostatic Force ◽  
Switching System ◽  
System P ◽  
Droplet Manipulation

A multi-inlet-multi-outlet (MIMO) superhydrophobic droplet guiding track was demonstrated for water droplet manipulation using an electrostatic force-induced trajectory switching system.

scholarly journals A Review of Smart Lubricant-Infused Surfaces for Droplet Manipulation

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 801
Author(s):  
Zhentao Hao ◽  
Weihua Li
Keyword(s):  
Electrostatic Force ◽  
Future Research ◽  
Great Promise ◽  
Self Healing ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Recent Developments ◽  
Future Research Directions ◽  
Droplet Manipulation ◽  
External Stimuli

The nepenthes-inspired lubricant-infused surface (LIS) is emerging as a novel repellent surface with self-healing, self-cleaning, pressure stability and ultra-slippery properties. Recently, stimuli-responsive materials to construct a smart LIS have broadened the application of LIS for droplet manipulation, showing great promise in microfluidics. This review mainly focuses on the recent developments towards the droplet manipulation on LIS with different mechanisms induced by various external stimuli, including thermo, light, electric, magnetism, and mechanical force. First, the droplet condition on LIS, determined by the properties of the droplet, the lubricant and substrate, is illustrated. Droplet manipulation via altering the droplet regime realized by different mechanisms, such as varying slipperiness, electrostatic force and wettability, is discussed. Moreover, some applications on droplet manipulation employed in various filed, including microreactors, microfluidics, etc., are also presented. Finally, a summary of this work and possible future research directions for the transport of droplets on smart LIS are outlined to promote the development of this field.

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