ACS Applied Nano Materials
·
2024
·
IF 5.3
Hairong Wu,Kunpeng Hou,Guorui Xu,Genglin Li,Jiawei Chang,Tianfang Luan,Wenhao Shao,Jirui Hou
The CO2-responsive Pickering emulsions employed have garnered considerable attention across enhanced oil recovery agents, delivery of crude, and oilfield-produced fluid treatment. This study focuses on the design of an innovative type of Janus nanoparticle (JNP) and its application in the construction of CO2 stimuli-responsive Pickering emulsions. The emulsion stabilized by JNPs demonstrates swift phase separation subsequent to the injection of CO2. Furthermore, the mechanism of the CO2-stimulated responsiveness enabled by the JNPs was proposed. Based on the Schiff reaction, the synthesis of JNPs was achieved successfully via the Pickering emulsion template method. The properties of the JNPs were studied using various analytical techniques such as Fourier transform infrared, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, etc. The developed responsive system, composed of JNPs and sodium oleate surfactant, showed high interfacial activity at the oil/water interface. The study revealed that the responsive system-stabilized Pickering emulsions could remain stable at 70 °C and room temperature for 24 and 120 h, respectively. Furthermore, the introduction of CO2 for 1.5 min resulted in phase separation because the nanoparticles lost the amphiphilic nature, triggering a significant decrease in interfacial activity and the protonation of sodium oleate surfactant inactivation. Then, the particles started to desorb from the interface. This study proposes a convenient, simple, and cost-effective approach for preparing fast CO2-responsive Pickering emulsions. It provides novel insights into the advancement of oilfield-produced fluid treatment, transportation of crude oil, and enhanced oil recovery.
研究领域:
化学工程
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材料科学
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石油工程
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产品关联
DOI
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2022
·
IF 11.958
Zhenxing Du,Wenqiang Zuo,Penggang Wang,Wei She
Bubble-templated advanced cellular materials with ultralight and superior thermal insulation properties have shown great potential in energy-saving related applications. However, insufficient bubble stability severely limits the generation of such highly porous structures . Herein, we present an efficient method to produce ultra-stable aqueous foams by combing the amphiphilic Janus nanoparticle (Janus-SiO 2 ) with the surface-active polymer (hydroxypropyl methylcellulose). The life of aqueous foams is dramatically increased from 4 h to over 5 days with 5 wt% Janus-SiO 2 concentration. The dense adsorbed layer formed by the efficient adsorption of Janus-SiO 2 on the bubble film is the main factor for the outstanding foam stability. Owing to the greatly enhanced foam stability, we successfully produce ultralight cellular cement with hierarchical cellular structures and a density as low as 80 kg/m 3 . The ultralight cellular cement exhibits superior mechanical strength , robust fire resistance and excellent thermal insulation with a thermal conductivity as low as 0.038 W·m −1 ·K −1 . This work provides a practical approach for fabricating various advanced porous materials that employ bubbles as templates.
研究领域:
材料科学
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热能工程
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产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 21
·7291
·
IF 4.927
Yue Hao,Shu Bai,Linling Yu,Yan Sun
One of the main challenges of transmucosal drug delivery is that of enabling particles and molecules to move across the mucosal barrier of the mucosal epithelial surface. Inspired by nanovehicles and mucus-penetrating nanoparticles, a magnetically driven, mucus-inert Janus-type nanovehicle (Janus-MMSN-pCB) was fabricated by coating the zwitterionic polymer poly(carboxybetaine methacrylate) (pCB) on the mesoporous silica nanorod, which was grown on one side of superparamagnetic Fe3O4nanoparticle using the sol–gel method. X-ray diffraction, transmission electron microscopy, vibrating sample magnetometry, and Fourier infrared spectroscopy were used to characterize the structure and morphology of the nanovehicles, proving the success of each synthesis step. The in vitro cell viability assessment of these composites using Calu-3 cell lines indicates that the nanovehicles are biocompatible in nature. Furthermore, the multiparticle tracking, Transwell®system, and cell imaging experimental results demonstrate that both the modification of pCB and the application of a magnetic field effectively accelerated the diffusion of the nanovehicles in the mucus and improved the endocytosis through Calu-3. The favorable cell uptake performance of Janus-MMSN-pCB in mucus systems with/without magnetic driving proves its potential role in the diagnosis, treatment, and imaging of mucosal-related diseases.Keywords:mucus penetration;nanovehicle;Janus nanoparticle;magnetically driven;zwitterionic polymer
研究领域:
药物递送系统
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纳米技术
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2024
·
IF 6
Ning Wang,Donghua Wang,Dandan Wu,Liqi Wang,Xiuqing Zhu,Dianyu Yu
In this study, Janus nanoparticles were prepared and used to construct Pickering emulsion as an emulsifier in presence of lipase. The results showed that Janus nanoparticles could be used to stable water phase in emulsion and the average particle size of emulsion was 60 μm. Phytosterol ester was successfully synthesized in Pickering emulsion catalytic system by using oleic acid as acyl accepter, and the phytosterol conversion reached 91.65 ± 2.07% under the following conditions: emulsifier amount of 1.0 wt%, oil-water ratio of 6:1, phytosterol concentration of 110 mmol/L, lipase dosage of 20 g/L, reaction temperature of 45 °C. Compared with biphasic catalytic system, Pickering emulsion catalytic system could enhance the catalytic efficiency and shorten the reaction time due to large interface area and short molecule diffusion distance. At the end of reaction, Janus nanoparticles could be recovered by simple centrifugation, the relative activity of lipase remained 72.89 ± 1.83% after repeated use for 6 times. Overall, this paper provides a novel and high efficiency interfacial biocatalysis technique for the synthesis of phytosteryl oleate.
研究领域:
生物学
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化学工程
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食品科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Tao Yu,Jiangjiexing Wu,Yuhe Shen,Anastasia Penkova,Wei Qi,Rongxin Su
The problem of marine biofouling persists in marine resource development, particularly for marine observation. While nanomaterials with enzyme-mimicking activity show promise in combating marine biofouling, their unique physicochemical properties that enable nanozymes with multiple enzymatic activities for a synergetic antifouling effect have yet to be explored. Here, it is shown that a transparent zwitterionic coating based on Ag/Ag 2 S Janus nanoparticles (Ag/Ag 2 S JNPs) with peroxidase-, light-activated oxidase-, and haloperoxidase-mimicking activities contributes to antifouling synergy. The mechanism of the nanozyme action is revealed in a detailed experimental and computational study, in which unique Janus structures guarantee multi-enzyme-mimicking properties and produce OH, HOBr, and O 2 − to combat biofouling. Through the formation of hydration layers, zwitterionic coatings further enhance this antifouling capacity, as demonstrated by both indoor and outdoor marine field antifouling tests. Consequently, a coating like this shows a clear transmittance and excellent antifouling ability after 90 days in marine immersion, reducing fouling by 74.91 % and 39.71 % compared to a control coating and a commercial coating, respectively. This study not only demonstrates synergetic antifouling actions via multi-enzyme-mimicking activities but also uncovers a new paradigm in nanozyme-based environmentally friendly, sustainable antifouling strategy.
研究领域:
材料科学
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海洋生物学
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Peiwen Zhu,Shushun Luo,Hao Li,Jianming Pan
Iron oxide with superparamagnetic property and mesoporous silica with large surface areas are both important to design multifunctional sorbents, and magnetic-mesoporous nanoparticles of asymmetric morphology may make full use of their advantages. To address this, spatially isolated magnetic-mesoporous units in one anisotropic Janus nanoparticle with abundant amidoxime (AO) groups (AO-Fe 3 O 4 @C&mSiO 2 ) was synthesized for rapid and selective extraction of uranium. Chemically and structurally anisotropic AO-Fe 3 O 4 @C&mSiO 2 was composed of one AO functionalized mesoporous silica nanorods and a carbon coated Fe 3 O 4 nanoparticle, which displayed excellent surface area (139.9 m 2 g −1 ) and saturation magnetization (28.79 emu g −1 ). Thus, AO-Fe 3 O 4 @C&mSiO 2 showed fast adsorption kinetics for reaching adsorption equilibrium within 30 min, and then they were able to be collected in 3.0 s under an external magnetic field. The maximum and spontaneous adsorption capacity for uranyl ions was obtained by fitting thermodynamic data through Langmuir model at 298 K was 62.12 mg g −1 , and AO-Fe 3 O 4 @C&mSiO 2 achieved the highest uptake amount and removal rate of almost 100% towards uranium in the presence of competitive ions. Meanwhile, the results from ten regeneration cycles confirmed the high service lifetime of AO-Fe 3 O 4 @C&mSiO 2 . This work not only demonstrates a strategy for preparing multifunctional sorbents with anisotropic structure but also provides a method for selective uranium extraction.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
GOLD BULLETIN
·
2020
·Vol. 53
·期 2
·55-62
·
IF 1.706
Li Degui,Luo Yujia,Lan Jiaxin,Luo Zhihong,Li Fujie,Luo Kun
Ligand exchange was triggered at toluene/water emulsion interface between homogeneous gold nanoparticles (Au NPs) with triphenylphosphine (PPh 3 ) and D-penicillamine (D-PA), resulted in amphiphilic Janus Au NPs with both phosphine and thiolate ligands. TEM and XRD analyses indicate that the product is composed of Au nanocrystals in an average diameter of about 3.7 nm. XPS, FTIR, Raman, and 1 H NMR analyses demonstrate that the Au NPs are protected with hydrophilic D-PA molecules and lipophilic PPh 3 ligands in a molecular ratio of ca. 1.8. The NOESY analysis and contact angle measurement further suggest that the D-PA and PPh 3 molecules are spontaneously separated to form compartmentalized hydrophilic and lipophilic regions on the individual Au NPs, which exhibit good catalytic performance and recyclability on the reduction of 4-nitrophenol. The results demonstrate that amphiphilic Janus Au NPs can be synthesized by partly exchange of PPh 3 with D-PA at toluene/water emulsion interface and are potentially applicable for other phosphine/thiolate pairs to modify Au NPs.
研究领域:
材料科学
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纳米技术
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化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2021
·
IF 5.985
Zhangfan Ye,Heng Yu,Zheng Zheng,Bintao Hu,Yongliang Zhao,Haitao Wang
Silica Janus nanoparticles have great potential to improve the compatibility of immiscible polymer blends due to their synergetic amphiphilicity and Pickering effect. However, a great challenge of the scalable production of Janus nanoparticles still remains because of the complex preparation procedure and strict synthesis conditions. Herein, high internal phase emulsion templates stabilized by hyperbranched vinyl-substituted polyethoxysiloxane alone are used as microreactors to realize the well-defined functionalization of porous materials in the oil phase and aqueous phase independently. Janus nanoshards (JNs) are then obtained via crushing the formed silica aerogels, followed by grafting polyolefin elastomer (POE) chains on the opposite surface with polystyrene (PS) chains. The morphology of the silica JNs is observed by field-emission scanning electron microscopy and transmission electron microscopy. The prepared silica JNs can anchor at the interface of PS/POE blends to manipulate the phase morphology and improve the adhesion of two phases. Synchronous strengthening and toughening of the polymer blends are achieved by using functional silica JNs as compatibilizers. This work proposes a new strategy for the large-scale production of silica JNs suitable for compatibilizing immiscible polymer blends.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 36
·6392-6399
·
IF 3.756
Yuhan Kong,Gongguo Zhang,Chunyu Wang,Yanyun Ma,Yiqun Zheng
Noble metal Janus nanocrystals involving components with the same crystal structure and close lattice constants are technically difficult to produce as anisotropic growth is not favored under general deposition conditions. Herein, taking Au and Ag, we describe a feasible synthetic strategy to create Au–Ag Janus nanoparticles (JNPs) with tunable sizes, which exhibit multiple plasmonic absorptions in the UV-vis range. The success of the current synthesis lies in the surface doping of trisoctahedral (TOH) Au seeds with limited amount of Pt/Ag atoms to introduce a relatively large lattice strain during the seeded growth, which is found crucial to facilitate the anisotropic deposition of Ag. In contrast, the use of undoped Au seeds leads to the formation of Au@Ag core–shell nanoparticles. The size of resulting products could be tuned by varying the amount of the added Ag precursor or the size/quantity of Au seeds. Compared to core–shell counterparts, the current Au–Ag Janus nanoparticles exhibit more plasmonic absorption peaks. Owing to such advantages, the current Au–Ag Janus nanoparticles show enhanced catalytic properties in the reduction of 4-nitrophenol under UV-vis light irradiation. The current study provides a feasible strategy that allows the fabrication of Janus bimetallic nanocrystals with elements having a close lattice constant and validates the promising use as plasmonic catalysts, which could be potentially extended to other metals or alloys.
研究领域:
材料科学
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纳米技术
·
光学
✓ 已验证
DOI
高影响因子
Acta Biomaterialia
·
2021
·
IF 8.947
Manjie Zhang,Yanxia Jiang,Kezhen Qi,Yangyang Song,Lu Li,Jing Zeng,Chungang Wang,Zhen Zhao
The anisotropic Janus nanoparticles (JNPs) provide synergistic effects by concentrating multiple properties on a single carrier. Herein, we reported a novel and simple approach to fabricate acorn-like poly(acrylic acid)-mesoporous calcium phosphate/polydopamine (PAA-mCaP/PDA) JNPs, which were selectively functionalized with methoxy-poly(ethylene glycol)thiol (PEG-SH) on PDA domains to obtain superior stability, while the other mCaP sides served as a storage space and passage for the anti-cancer drug of doxorubicin (DOX). The unique acorn-like PAA-mCaP/PDA-PEG JNPs were utilized as novel theranostic agents for photoacoustic (PA) imaging-guided synergistic cancer chemo-phototherapy. More importantly, this synthetic strategy can be applied to synthesize various mesoporous Janus nanocarriers, paving the way toward designed synthesis of acorn-like JNPs in nanomedicine , biosensing and catalysis. Statement of significance The distinct acorn-like poly(acrylic acid)-mesoporous calcium phosphate/polydopamine Janus nanoparticles (PAA-mCaP/PDA JNPs) with a spherical-shaped PAA-mCaP core and PDA half-shell were fabricated for the first time. To achieve superior stability, the acorn-like PAA-mCaP/PDA JNPs were selectively functionalized with methoxy-poly(ethylene glycol)thiol (PEG-SH) on PDA domains to obtain acorn-like PAA-mCaP/PDA-PEG JNPs. The resultant acorn-like PAA-mCaP/PDA-PEG JNPs own an excellent biocompatibility, high drug-loading contents, good photothermal conversion efficiency, photoacoustic (PA) imaging capacity and pH/NIR dual-responsive properties, enabling the acorn-like JNPs to be applied for PA imaging-guided synergistic cancer chemo-phototherapy. More importantly, the synthetic approach could be extended to prepare acorn-like mesoporous inorganic substances/PDA JNPs for specific applications.
研究领域:
纳米医学
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生物材料
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癌症治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2021
·Vol. 12
·期 16
·2447-2456
·
IF 5.582
Wei Wen,Aihua Chen
The self-assembly of amphiphilic single chain Janus nanoparticles (SCJNPs) is a novel and promising approach for fabricating assemblies with diversified morphologies. However, experimental research into the self-assembly behavior of SCJNPs is still limited. Furthermore, it is desirable to broaden the functionality of assemblies of SCJNPs. Herein, we constructed photoresponsive liquid crystalline (LC) SCJNPs through the intrachain photo-cross-linking of azobenzene-containing amphiphilic linear block copolymer precursors of poly(poly(ethylene glycol)methyl ether methacrylate)-b-poly(11-(4-((4-butylphenyl)diazenyl)phenoxy)undecyl methacrylate-co-11-(4-(4-butylstyryl)phenoxy)undecyl methacrylate). The self-assembly behavior of these LC-SCJNPs in solution was investigated via controlling the block copolymer (BCP) composition and initial concentration. Under the effect of the LC driving force, non-spherical assemblies, including lamellae and tubes, were obtained. Additionally, the photoinduced morphological transformations of assemblies with various azobenzene contents were studied via irradiation with alternative UV/vis light irradiation. Owing to the azobenzene moieties tethered within the SCJNP building blocks via intrachain cross-linking, reversible photoinduced morphology transitions of tubes-connected spheres-tubes and spherical vesicles-spheres-spherical vesicles were observed for assemblies with a higher azobenzene content. This work broadens the functionality and self-assembly systems of SCJNPs, providing a novel view of the photoinduced morphological transitions of assemblies from SCJNPs.
研究领域:
高分子化学
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纳米材料科学
·
软物质物理
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光响应材料
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自组装
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功能高分子
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Le Zhou,Hongwen Zhang,Haoming Bao,Yi Wei,Hao Fu,Weiping Cai
Silver (Ag)-based Janus nanoparticles (NPs) are of broad interest for extensive applications due to their excellent photoelectric performances and special structure. However, it still remains challenging to prepare this type of Janus NP with high uniformity in a large scale. Here, we present a facile wet-chemical strategy to synthesize Ag-MoS2 Janus NPs via adding an appropriate amount of AgNO3 into the MoS2 nanosphere (200 nm in size)-contained aqueous solution. These Janus NPs represent a new type of heterogeneous nanostructure. Each Janus NP is made up of one tiny-Ag-dot-decorated MoS2 nanosphere and one polyhedral Ag single crystal (∼100 nm in size), and both of them attach together, showing a snowman-like dimer. Such Janus NPs or dimers can not be detached by the ultrasonic vibration even with a high power, showing strong adhesion between them. Further, the morphology and size of the polyhedral Ag nanocrystals attached on MoS2 nanospheres can be controlled by the AgNO3 addition amount, reaction time, and temperature. A growth model is proposed to understand the formation of these Janus NPs, which is based on the tiny Ag dots’ aggregation and oriented connection mechanism. Importantly, such Ag-MoS2 Janus NPs can be used as nanomotors, due to their asymmetric catalytic component structure, and self-propelled in H2O2 fuel solutions. They show good directional motion and significant dependence of their speed on fuel concentration. This study expands our understanding of the formation of heterogeneous Janus particles and provides a promising platform to investigate active colloids as nanomotors.
研究领域:
材料科学
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纳米技术
·
催化化学
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产品关联
DOI
危险品化学品经营许可证（带存储）