TALANTA
·
2021
·
IF 6.057
Xu Cui,Tianbao Hu,Qiang Chen,Qiang Zhao,Yin Wu,Tengbao Xie,Pengyong Liu,Xi Su,Gang Li
Digital bioassays are powerful methods to detect rare analytes from complex mixtures and study the temporal processes of individual entities within biological systems. In digital bioassays, a crucial first step is the discretization of samples into a large number of identical independent partitions. Here, we developed a rapid and facile sample partitioning method for versatile digital bioassays. This method is based on a detachable self-digitization (DSD) chip which couples a reversible assembly configuration and a predegassing-based self-pumping mechanism to achieve an easy, fast, and large-scale sample partitioning. The DSD chip consists of a channel layer used for loading the sample and a microwell layer used for holding the sample partitions. Benefitting from its detachability, the chip avoids a lengthy oil flushing process used to remove the excess sample in loading channels and can compartmentalize a sample into more than 100,000 wells of picoliter volume with densities up to 14,000 wells/cm 2 in less than 30 s. We also demonstrated the utility of the proposed method by applying it to digital PCR and digital microbial assays.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Huanjie Chi,Zhiguang Xu,Tao Zhang,Xiaomin Li,Zhu Wu,Yan Zhao
Stimuli-responsive surfaces with wettability change between superhydrophilic and superhydrophobic are susceptible to oil contamination which often ruins the surface. Herein, a coating with pH-switchable wettability transition between superamphiphobic and superhydrophilic-superoleophobic is achieved by rationally designing oleophobic/pH-responsive polymer heterogeneous chemistry. Fabrics modified with this coating show repellency to both water and oils, while upon exposure to acidic water (pH = 1) the fabrics change to be superhydrophilic-superoleophobic within a short response time of <5 s. More importantly, the superamphiphobicity of the fabric can be restored under mild alkaline condition (pH = 10), and the transition is reversible for many cycles. The effective in situ or ex situ wettability change under acidic/alkaline water treatment makes the coated fabric capable of separating oil–water mixture or even some mixtures of immiscible organic solvents. In addition, the coated fabric is also demonstrated to be promising as a new class of functional fabrics that provide protection against water and many oils in one condition, and can change to be hygroscopic, anti-static, oil-repellent and anti-oil-fouling in the other condition for improved wear comfort and self-cleaning.
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高影响因子
Materials
·
2021
·Vol. 14
·期 5
·1263
·
IF 3.623
Rui Xu,Shijiao Zhao,Lei Nie,Changsheng Deng,Shaochang Hao,Xingyu Zhao,Jianjun Li,Bing Liu,Jingtao Ma
In this study, we report a novel high-throughput and instant-mixing droplet microfluidic system that can prepare uniformly mixed monodisperse droplets at a flow rate of mL/min designed for rapid mixing between multiple solutions and the preparation of micro-/nanoparticles. The system is composed of a magneton micromixer and a T-junction microfluidic device. The magneton micromixer rapidly mixes multiple solutions uniformly through the rotation of the magneton, and the mixed solution is sheared into monodisperse droplets by the silicone oil in the T-junction microfluidic device. The optimal conditions of the preparation of monodisperse droplets for the system have been found and factors affecting droplet size are analyzed for correlation; for example, the structure of the T-junction microfluidic device, the rotation speed of the magneton, etc. At the same time, through the uniformity of the color of the mixed solution, the mixing performance of the system is quantitatively evaluated. Compared with mainstream micromixers on the market, the system has the best mixing performance. Finally, we used the system to simulate the internal gelation broth preparation of zirconium broth and uranium broth. The results show that the system is expected to realize the preparation of ceramic microspheres at room temperature without cooling by the internal gelation process.Keywords:microfluidic;high-throughput;micromixing;monodisperse droplets;internal gelation process
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hui Zhou,Xueshan Jing,Shanpeng Li,Zhiguang Guo
It should be noted that the multifunctional surface is ideal for manipulation droplets to play different roles in various fields, especially for water collection. Here, a unique design scheme, a multibioinspired slippery surface for water collection, is proposed derived from the Namib desert beetle, cactus, aquatic vegetations and Nepenthes, which synergistically combines fog capture, condensation and transportation, indicating better performance than other synthetic surfaces. Without relying on additional energy input or droplet coalescence, this multi-bioinspired slippery surface shows ideal droplet pumping and water collection efficiency. Moreover, the morphology of the triple contact lines is simulated by Surface Evolver, and the state of droplet’s migration is discussed from the perspective of force analysis and energy calculation. The experimental results show that the as-prepared substrate had excellent stability and weather resistance under different circumstance. Compared with the single original Zn sheet, the water collection efficiency of this unique water collection device is increased by about 257.9%. Therefore, this reasonable design strategy and the corresponding theoretical simulation can be applied to a wide range of water harvesting and other fields.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
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IF 3.764
Yunrui Han,Lin Han,Limin He,Shipeng Wang,Xiaoming Luo
The initial motion of micro-oil droplets on substrates immersed in water is of great significance to study droplet motion. Here, microscopic experiments and mechanism analysis are used to establish a universal criterion and a mathematical model describing the critical conditions for the initial motion of droplets adhered on surfaces with different wettability in the laminar flow. We demonstrate a surface modification technique and analysis method in a microtest. Based on the force’s analysis on the three-phase contact points of two-dimensional oil droplets on the surfaces, the movement mechanism is also obtained when the oil droplets start to move. In addition, this work focuses on the coupling effects of oil droplet’s height, surface properties, and water flow velocity on the initial motion behaviors of oil droplets and obtains the critical shear water flow velocity required for the critical movement of oil droplets from different surfaces. We achieve a universal criterion and model for different application scenarios, which are of great scientific significance to improve theoretical systems of multiphase separation and guide the design and optimization of surface properties and flow field velocity.
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高影响因子
ACS Applied Nano Materials
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2021
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IF 5.097
Xiaoxiang Wen,Xuegang Lu,Chaoping Wei,Jianing Li,Yanlin Li,Sen Yang
Bright structural colors with an angular-independent character are in increasing demand in many fields such as pigments, buildings, sensors, color displays, and anti-counterfeiting labels. However, the structural colors produced by amorphous colloidal assemblies with low refractive index contrast or without black additives often exhibit low color visibility and low liquid-bleaching resistibility. Herein, large-scale and angle-independent structural colors were constructed from Fe3O4@SiO2 colloidal quasi-amorphous arrays (QAAs) prepared through a rapid “spraying” process. Due to the high-refractive-index and intrinsic black nature of Fe3O4, the coatings exhibit high brightness of structural colors even on white substrates under ambient lighting conditions. Moreover, as-obtained structural colors possess the ability of antiliquid bleaching and solvent-responsiveness. More importantly, flexible Fe3O4@SiO2/PDMS photonic paper can be fabricated by permeation of PDMS into the voids of Fe3O4@SiO2 colloidal QAAs. This QAAs-based photonic paper shows the ability to infuse silicone oils into its structure, locally swelling it and changing the reflected color. In turn, the resulting colored patterns can be easily erased by applying ethanol or low molecular weight silicone oils. The as-prepared photonic paper exhibits excellent durability and is rewritable at least 50 times without any significant changes in performance. Compared with the traditional long-range ordered photonic crystals, the rapidly prepared QAAs-based photonic coatings have unique advantages in the applications of permanents, color coatings, color printing, liquid colorimetric sensors, rewritable photonic paper, etc. because of the good structural color performance and are suitable for rapid and large-area preparation.
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高影响因子
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
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2021
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IF 3.186
Xin Huang,Limin He,Xiaoming Luo,Ke Xu,Yuling Lü,Donghai Yang
s The coalescence behaviors of two neutral droplets suspended in silicone oil under the alternating current (AC) and pulsed direct current (DC) electric fields are investigated by experiments and numerical simulations. The distribution evolutions of electric force and velocity field during the droplet coalescence under the AC and pulsed DC electric fields are analyzed. The relationship between electric field excitation and droplet interface response is illustrated. The equivalent response mechanism of droplets under the high-frequency AC and pulsed DC electric fields and under the DC electric fields is revealed. The relationship of droplet dynamic behaviors under the DC electric field and under the AC and pulsed DC electric fields are established. The critical electric field frequencies above which the shortest distance curves no longer change under the AC and pulsed DC electric fields are obtained. These new findings are significant for the optimization of electrostatic coalescence.
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高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2021
·Vol. 118
·期 23
·e2024329118
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IF 11.205
Panbing Wang,M. A. R. Al Azad,Xiong Yang,Paolo R. Martelli,Kam Yan Cheung,Jiahai Shi,Yajing Shen
We disclose a peculiar rotational propulsion mechanism of Ray sperms enabled by its unusual heterogeneous dual helixes with a rigid spiral head and a soft tail, named Heterogeneous Dual Helixes (HDH) model for short. Different from the conventional beating propulsion of sperm, the propulsion of Ray sperms is from both the rotational motion of the soft helical tail and the rigid spiral head. Such heterogeneous dual helical propulsion style provides the Ray sperm with high adaptability in viscous solutions along with advantages in linearity, straightness, and bidirectional motion. This HDH model is further corroborated by a miniature swimming robot actuated via a rigid spiral head and a soft tail, which demonstrates similar superiorities over conventional ones in terms of adaptability and efficiency under the same power input. Such findings expand our knowledge on microorganisms’ motion, motivate further studies on natural fertilization, and inspire engineering designs.
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高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 6
·1486
·
IF 5.076
Xuan Wang,Weihua Ao,Sijia Sun,Han Zhang,Run Zhou,Yangzi Li,Jie Wang,Hao Ding
Superhydrophobic coatings with intelligent properties have attracted much attention because of their wide application in many fields. However, there is a limited amount of literature on superhydrophobic coatings whose wettability and adhesion can be adjusted by UV irradiation and calcination at the same time. In this study, amorphous SiO2microspheres (A-SiO2) and nano-TiO2particles (N-TiO2) were used to fabricate A-SiO2/N-TiO2composites by wet grinding, and then, they were modified with polydimethylsiloxane (PDMS) and sprayed onto substrate surfaces to obtain a tunable adhesive superhydrophobic A-SiO2/N-TiO2@PDMS coating. It is worth noting that the wettability and adhesion of the coating to water droplets could be adjusted by UV irradiation and calcination. The mechanisms of the aforementioned phenomena were studied. Moreover, methyl orange solution could be degraded by the coating due to its photocatalysis. The as-prepared coating had good adaptation to different substrates and outdoor environments. Moreover, the surfaces of these coatings exhibited the same liquid repellency towards different droplets. This research provides an environmental strategy to prepare advanced self-cleaning coatings.Keywords:superhydrophobicity;photocatalytic activity;tunable adhesion;TiO2;PDMS
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高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Wanli Lu,Chao Duan,Yanling Zhang,Kun Gao,Lei Dai,Mengxia Shen,Wenliang Wang,Jian Wang,Yonghao Ni
Electrospun nanofiber membrane (ENM) shows great advantage and potential in wastewater treatment due to its unique properties. However, exploring a green and efficient ENM for remediation of complex wastewater, such as simultaneous containing oils, dyes and heavy metal ion, remains challenging. In this work, a cellulose-based photocatalytic ENM, is constructed for this purpose. The hybrid ENM is prepared via electrospinning deacetylated cellulose acetate/polyvinyl pyrrolidone (CeP) nanofibers as skeleton cores and in-situ synthesis of beta hydroxyl oxidize iron decorated iron-based MOF (β-FeOOH@MIL-100(Fe)) heterojunctions as photocatalytic sheaths. The core-sheath structured ENM has ultrahigh MIL-100(Fe) loading (78 wt%), large surface areas (1105 m 2 /g) and well-dispersed β-FeOOH nanorods. Thanks to these porous and hydrophilic MIL-100(Fe), along with a robust photocatalysis-Fenton synergy from β-FeOOH@MIL-100(Fe), the as-prepared ENM shows outstanding performances with simultaneous high removal efficiency for oils (99.5 %), dyes (99.4 %) and chromium ion (Cr(VI)) (99.7 %). Additionally, the photocatalytic ENM can achieve a long-term reuse owing to its inherent self-cleaning function.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xuelian Gou,Zhiguang Guo
Anisotropic slippery lubricant-infused surfaces with favorable sliding behaviors are highly desirable for water collection and directional bubble transportation. Inspired by natural reed leaves with anisotropic wettability along two directions of groove geometry, a soft lithographic approach of replica molding was implemented to successfully replicate the surface microstructures of reed leaves using polydimethylsiloxane (PDMS). Subsequently, various lubricants were infused to fabricate anisotropic hydrophobic or hydrophilic slippery surfaces. The as-prepared anisotropic hydrophilic lubricant-infused surface (A-HH-LIS) exhibited remarkable droplet nucleation and removal during water collection. The results demonstrated that the surfaces maintained stable water collection rate even under high shear force rate up to 7000 rpm and exhibited favorable liquid repellency at lower or higher temperature. Furthermore, the directional transportations of water (in air) and air bubbles (underwater) on anisotropic hydrophobic lubricant-infused surface (A-HB-LIS) were achieved with outstanding performance. Moreover, the effects of tilted angle β (the angle between sample and plumb line) and rotational angle α (the angle between groove direction and horizontal line) on sliding behavior were explored. The reported anisotropic slippery lubricant-infused surfaces have great potential in water condensation, bubble transportation and marine anti-fouling.
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高影响因子
LANGMUIR
·
2020
·
IF 3.557
Qian Du,Chuan Zhang,Si Sun,Yang Wang,Houtao Liu,Yingying Wei,Yong Jiang
Smart surfaces prepared using superhydrophobic coatings have been used to control the movement of tiny aqueous droplets for many years. However, the control of both aqueous droplets and oily droplets is still a challenge. Herein, a novel smart superamphiphobic composite film is developed with a superamphiphobic and magnetic surface as well as a soft elastic substrate for liquid droplets manipulation. The raspberry-like nanoparticles on the surface are synthesized by co-hydrolyzation of fluoroalkyl silane and tetraethoxysilane on iron oxide nanoparticles. The resulting composite nanoparticles (F/SiO2@Fe3O4 NPs) exhibit excellent superhydrophobicity (WCA of about 170°) and superoleophobicity (OCA of about 160°) as well as magnetism (saturated magnetization value of 12.0 emug–1). The morphologies of the F/SiO2@Fe3O4 NPs were investigated by transmission electron microscopy and scanning electron microscopy. Chemical composition and magnetization value of these magnetic nanoparticles as well as the magnetic field induced droplets manipulation behavior of the smart surface were also evaluated. The smart surface can realize the manipulation of both water droplets and oil droplets, which demonstrates potential applications in microfluidic technologies.
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高影响因子
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