PHYSICS OF FLUIDS
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2022
·Vol. 34
·期 7
·
IF 4.98
Han Yunrui,Xu Tuotuo,He Limin,Wang Shipeng,Luo Xiaoming
The movement and detachment of tiny oil droplets in water on a substrate is the key technology to strengthen oil–water separation by using corrugated plate oil–water separation technology. Here, the detachment behaviors of oil droplets adhered to substrates with different wettabilities in a laminar flow field are studied experimentally and theoretically. The morphologic changes of mother and daughter oil droplets are obtained when the adhered oil droplets are continuously separated. The shedding mechanism of oil droplets is analyzed in detail, and the critical condition for the effective detachment of oil droplets is obtained, which can be used to guide the design of the surface wettability and water flow velocity in the actual production of oil–water separation.
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Nano Today
·
2021
·
IF 20.722
Dagan Zhang,Lijun Cai,Xiaowei Wei,Yuetong Wang,Luoran Shang,Lingyun Sun,Yuanjin Zhao
Clustered regularly interspaced short palindromic repeats (CRISPR) and CRISPR associated nucleases (CRISPR/Cas) platforms have a demonstrated value in nucleic acid detection, while their multiplex screening capability is still challenging. Herein, we present a novel CRISPR/Cas9 platform based on bioinspired photonic crystal (PhC) barcodes for multiplex and sensitive nucleic acid detection. The bioinspired PhC barcodes not only exhibit distinctive structural color as encoding elements, but also possess abundant functional surface groups for probe immobilization with the presence of polydopamine (PDA) coating. The CRISPR/Cas9 system recognizes and cleaves target DNA and with the help of Klenow fragment to produce ssDNA, which was subsequently captured by the PhC barcodes and the detection signal was amplified by hybridization chain reaction (HCR). Based on this platform, we demonstrated that Human Papilloma Virus (HPV) nucleic acids could be detected with a highly sensitive limit of 0.025 pM and be multiplexed assayed with high accuracy and specificity. Thus, we believe that this platform paves an avenue for multiplexed biomarkers quantification in clinical disease diagnostics.
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ACS Applied Polymer Materials
·
2021
·
IF 4.089
Hao Zhang,Yuenan Zhang,Ling Fu,Ozioma Udochukwu Akakuru,Zongbao Wang,Aiguo Wu,Yujie Zhang
Water pollution has been increasingly becoming a serious environmental and health challenge in recent years. This is compounded by the often coexisting oil pollution and heavy metal pollution. It is of great practical significance to develop materials that can simultaneously deal with these two kinds of water pollution problems. In this study, a simple and green approach is proposed for preparing matrix-free citric acid modified alginate-based aerogel membrane by simple sol spraying, chemical cross-linking, and freeze-drying methods. The aerogel membrane with dense upper and lower surfaces and a loose interlayer possesses the properties of superhydrophilicity and underwater superoleophobic and strong antiadhesion performances, and it can realize the separation of highly viscous miscible oil–water emulsions with a separation efficiency of over 99.5%, even in corrosive and high-salt environments. The membrane has shown strong stability during 3000 min of uninterrupted cross-flow filtration of emulsion, which reflects the good long-term separation performance of the membrane. The prepared membrane can also be used for the removal of various heavy metal ions from water under gravity, with a removal efficiency >99% and an adsorption capacity of about 240 mg/g for Pb2+. The modified membrane which features low cost, a simple and green preparation process, excellent oil–water separation, and heavy metal removal capabilities possesses great application potential in the treatment of polluted water.
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CARBON
·
2021
·
IF 9.594
Jingyi Zhang,Lei Shu,Chao Chang,Xiaoxiang Li,Ruiming Lin,Benwei Fu,Chengyi Song,Wen Shang,Peng Tao,Tao Deng
Direct absorption of sunlight with carbon nanofluids is a facile way to efficiently harvest solar-thermal energy, but poor dispersion stability of nanofluids under elevated temperatures severely limits their applications. Herein, we report a general strategy to prepare stably-dispersed medium-temperature solar-thermal nanofluids by employing crumpled particles of ethanol-wetted graphene oxide sheets as the self-dispersible photothermal converters. The crumpled particles simultaneously possess intensively-deformed surface structure, a low density and a small particle size. Such features weaken the inter-particle van der Waals attraction and gravitational sedimentation of the crumpled particles, thereby enabling their long-term stable dispersion within commercial thermal storage oils. Uniform dispersion of nanofluids was maintained after continuous heating for 2 weeks under a heating temperature up to 200 °C. The homogenously dispersed nanofluids also achieved high solar absorptance with low particle loadings, and retained the large heat capacity and suitable viscosity. These combined advantageous thermophysical properties enabled consistent high-performance medium-temperature direct absorption-based nanofluidic solar-thermal energy harvesting under large-flux solar illumination.
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ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Haiyang Yu,Zheng Zhao,Bichen Xiao,Minghua Deng,Zhaoliang Wang,Ziqin Li,Huibin Zhang,Lei Zhang,Jingwen Qian,Jinhua Li
Thrombin is an important biomarker for various diseases and biochemical reactions. Rapid and real-time detection of thrombin that quickly neutralizes in early coagulation in the body has gained significant attention for its practical applications. Solution-gated graphene transistors (SGGTs) have been widely studied due to their higher sensitivity and low-cost fabrication for chemical and biological sensing applications. In this paper, the ssDNA aptamer with 29 bases was immobilized on the surface of the gate electrode to specifically recognize thrombin. The SGGT sensor achieved high sensitivity with a limit of detection (LOD) up to fM. The LOD was attributed to the amplification function of SGGTs and the suitable aptamer choice. The ssDNA configuration folding induced by thrombin molecules and the electropositivity of thrombin molecules could arouse the same electrical response of SGGTs, helping the device obtain a high sensitivity. The channel current variation of sensors had a good linear relationship with the logarithm of thrombin concentration in the range of 1 fM to 10 nM. The fabricated device also demonstrated a short response time to thrombin molecules, and the response time to the 1 fM thrombin molecules was about 150 s. In summary, the sensing strategy of aptamer-based SGGTs with high sensitivity and high selectivity has a good prospect in medical diagnosis.
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PubMed
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 19
·5974
·
IF 4.412
Iryna S. Protsak,Yevhenii M. Morozov,Dong Zhang,Volodymyr M. Gun’ko
The investigation of molecular interactions between a silica surface and organic/inorganic polymers is crucial for deeper understanding of the dominant mechanisms of surface functionalization. In this work, attachment of various depolymerized polydimethylsiloxanes (PDMS) of different chain lengths, affected by dimethyl carbonate (DMC), to silica nanoparticles pretreated at different temperatures has been studied using29Si,1H, and13C solid-state NMR spectroscopy. The results show that grafting of different modifier blends onto a preheated silica surface depends strongly on the specific surface area (SSA) linked to the silica nanoparticle size distributions affecting all textural characteristics. The pretreatment at 400 °C results in a greater degree of the modification of (i) A-150 (SSA = 150 m2/g) by PDMS-10/DMC and PDMS-1000/DMC blends; (ii) A-200 by PDMS-10/DMC and PDMS-100/DMC blends; and (iii) A-300 by PDMS-100/DMC and PDMS-1000/DMC blends. The spectral features observed using solid-state NMR spectroscopy suggest that the main surface products of the reactions of various depolymerized PDMS with pretreated nanosilica particles are the (CH3)3SiO-[(CH3)2SiO-]xfragments. The reactions occur with the siloxane bond breakage by DMC and replacing surface hydroxyls. Changes in the chemical shifts and line widths, as shown by solid-state NMR, provide novel information on the whole structure of functionalized nanosilica particles. This study highlights the major role of solid-state NMR spectroscopy for comprehensive characterization of functionalized solid surfaces.Keywords:silica nanohybrids;solid-state NMR;surface properties;polydimethylsiloxane;silica functionalization
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ACS Applied Nano Materials
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2021
·
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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ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Qingqing Rao,Yulin Lu,Lina Song,Yang Hou,Xiaoli Zhan,Qinghua Zhang
Smart slippery liquid-infused porous surfaces (SLIPSs) have aroused remarkable attention owing to tremendous application foreground in biomedical instruments and industry. However, challenges still remain in fabricating durable SLIPSs. In this work, a fast and highly efficient self-repairing slippery surface (SPU-60M) was fabricated based on a polyurethane membrane and silicone oil. By introducing a great quantity of reversible disulfide bonds into the polymer backbone and hydrogen bonds in the polymer interchain, this SLIPS material could be quickly repaired in 15 min with 97.8% healing efficiency. Moreover, the self-healing efficiency could be maintained at 42.75% after the 10th cutting–healing cycle. Notably, SPU-60M showed excellent self-repairing ability not only in an ambient environment but also in an underwater environment and at ultralow temperatures. Besides, the icing delay time (DT) of SPU-60M could be prolonged to 1182 s at −15 °C, and the ice adhesion strength was only 10.33 kPa at −30 °C. In addition, SPU-60M had excellent anti-fouling performance with BSA adsorption of 2.41 μg/cm2 and Escherichia coli CFU counts of 41 × 104. These findings provide a facile way to design highly efficient self-repairing SLIPSs with multifunctionality.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xu Zhu,Jianqiang Zhang,Lei Zhu,Ran Wang,Shang Gan,Jinwei Xue,Xilu Liu,Hui Li,Qingzhong Xue
Plastic pollution and oily wastewater discharge are the main factors which threaten the ecological environment, and the controlling of the two kinds of pollution consumes a lot of resources. From the perspectives of pollution treatment and saving resources, using solid waste (plastic waste) to treat liquid waste (emulsion) may have economic and environmental protection benefits. Here, a negatively charged hydrogel-coated recycled wet wipe (RWW-NH) is prepared by spraying and crosslinking process, which will be applied in cationic surfactant-contained oily wastewater treatment. The negatively charged hydrogel coating can absorb CTAB molecules, and the recycled wet wipe serving as the porous architecture can promote the coalescence of oil droplets. The obtained composite membrane has superior separation performance for CTAB stabilized emulsion, and the membrane with double layers can continuously separate 4000 mL emulsion with a permeation flux of 3057 L m −2 h −1 . Besides, RWW-NH can absorb cationic dyes and heavy metal ions, due to the negative charges and high-density phosphate groups of the coating, respectively. The as-prepared composite membrane with low cost and simple preparation process has both environmental and economic values, which provides a prospective application in environmental treatment.
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Small Methods
·
2021
·Vol. 5
·期 12
·2100969
·
IF 14.188
Quan Liu,Guodong Yu,Chongyu Zhu,Bo Peng,Ruohan Li,Tao Yi,Yanlei Yu
Manipulating droplets by light in microscale allows precise control of microfluidics, liquid delivery, micromachines, and so on. Among these applications, microfluidic technology is of particular interest for miniaturization of the portable analysis systems, which require the integration of various liquid operations in one device. Here, a photodeformable microfluidic platform is constructed by combining Laplace pressure and capillary condensation to integrate the transportation, fusion, separation, and mixing of liquid slugs in one chip. The Laplace pressure, attributed to the photodeformation of the liquid crystal polymers, is generated to propel the slug. The capillary condensation is introduced by the delicate design of the fluid channels, allowing the fusion and separation of slugs without any connected microvalves. Catalytic oxidation reaction and protein detection processes are realized in the platform, which are amenable to a variety of miniaturized bio-medical applications, such as portable analysis and point of care testing.
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高影响因子
LAB ON A CHIP
·
2021
·Vol. 21
·期 18
·3429-3437
·
IF 6.799
Tengbao Xie,Ping Wang,Lei Wu,Bangyong Sun,Qiang Zhao,Gang Li
In this work, we present a simple and equipment-free system for discretizing samples into tens of thousands of discrete volumes in tens of seconds. Unlike conventional sample discretization systems that require bulky syringe pumps, pressure controllers, or vacuum equipment, our system requires only a sheet of water-soluble film, a hand-operated syringe, and a microfluidic device containing a high-density microchamber array. In this system, the water-soluble film seals the device inlet to form a closed channel–chamber system, while the syringe is used to create a vacuum in the closed system. Benefitting from the high negative pressure created by syringe-vacuum and the dissolution-triggered gating mechanism of the sealing water-soluble film, the aqueous sample loaded into the device inlet can be rapidly partitioned into tens of thousands of isolated chambers without the need for any expensive pumping systems. We demonstrated the utility of this system by exploiting it for digital PCR. We believe that this simple discretization system will find broad applications, such as in digital bioassays, single-cell analysis, and point-of-care diagnostics.
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高影响因子
Journal of Composites Science
·
2021
·Vol. 5
·期 8
·207
·
IF 0
Ying Zhou,Cuihuan Song,Zhixiang Chen,Qixin Zhou
In this study, we prepared a novel coating composed of hexagonal molybdenum oxide (h-MoO3) nanofiller and waterborne epoxy resin (WEP) to provide corrosion protection. We optimized the h-MoO3nanorod synthesis methodology first by changing different parameters (pH, temperature, etc.). Furthermore, the as-prepared h-MoO3rods were characterized using a scanning electron microscope (SEM) and X-ray diffraction (XRD). Finally, the electrochemical impedance spectroscopy (EIS) test results verified that the anticorrosive performance of the composite coatings was improved by incorporation of low content of MoO3nanofiller (0.5 wt.%) compared to pure WEP sample. This developed composite will provide a new insight for the design and fabrication of one-dimensional (1D) nanomaterial (e.g., nanorod) reinforced epoxy coating and other polymeric coating processes.Keywords:waterborne epoxy;molybdenum trioxide nanorod;composites
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危险品化学品经营许可证（带存储）