APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yingdong Zhang,Lin Wang,Zhiwei Yang,Dongmei Yue
Janus particles, heterogeneous bifacial particles, have gained significant interest in materials science and chemical engineering. Nanoscale fabrication of these particles poses notable challenges. Although mature techniques exist for creating Janus particles from inorganic and polymeric materials, similar advancements in carbon dots (CDs) remain unreported. This paper introduces a novel approach using a liquid–liquid interface method to specifically modify CDs suspended at the biphasic interface, resulting in the formation of carbon dots with a unique Janus-type surface distribution (J-CDs). The surface structure was analyzed using transmission electron microscopy, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, elemental analysis and 13 C NMR spectroscopy. By correlating their fluorescence properties with time-dependent density functional theory (TDDFT) calculations, the relationship between the fluorescent characteristics of J-CDs and their asymmetric Janus surface structures was established, further confirming their unique Janus configuration. Water contact angle tests showed that J-CDs exhibit hydrophilic and hydrophobic properties that differ distinctly from those of traditional amphiphilic CDs when suspended in various solvents and dried on a silicon substrate, underscoring their novel structure. Enhanced surface properties were demonstrated through the stabilization of Pickering emulsions and fabrication of polystyrene microspheres, showcasing the potential of J-CDs to modulate surface characteristics for diverse applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·
IF 2.9
Xuan Yue,Feibo Li,Xiying Fu,Yanming Wang,Nan Yan
Janus particles, consisting of two or more chemically distinct composites within a single structural system, have attracted significant attention for their solid surfactant functionality, as well as their potential applications in micro/nanomotors and functional materials. Here, we present a simple and robust method to prepare plasmonic Janus particles consisting of a polystyrene-tethered gold nanorod (AuNRs@PS) head and a poly(4-vinylpyridine) (P4VP) head through emulsion confined assembly. The balance of the Janus particles can be finely tuned by adjusting the volume ratio of the AuNRs@PS solution and P4VP solution. The result shows that the diameter ratio (r) of AuNRs@PS5k/P4VP is proportional to the volume ratio (R) of the AuNRs@PS and P4VP solutions. Furthermore, the obtained Janus particles with AuNR head have a peak absorbance of around 800 nm, which can be applied in photothermal therapy. Additionally, multifunctionality can be achieved by reducing nanoparticle (NP) precursors on a prefabricated scaffold of P4VP or co-assembling P4VP-tethered NPs with AuNRs@PS building blocks. These multifunctional Janus particles hold great potential for applications in micro/nanomotors, catalysts, and biological materials.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Zhenxin Chu,Bin Zhong,Wanrong Zhou,Pengcheng Cui,Jiale Gu,Bingbing Tian,Oluseyi S. Olasoju,Xiaohua Zhang,Wei Sun
This study focused on the investigation in the influencing factors of the Granick’s method for Janus particle synthesis , in which selective modification of colloidosome made from a Pickering emulsion-based process was the essential strategy. Homogenizer with high shearing forces was introduced to make stable emulsion. With increased stirring speed of the homogenizer, the sizes of the colloidosomes decrease. And the stirring time of the homogenizer and the paraffin melting point have also been proved to have influence on the size distribution of colloidosomes as well as on the assembly morphology of the silica particles on the surface of the wax sphere. 160 s of the working time and the melting point of 53−57 °C were tested respectively to be the optimal condition for making the ideal colloidosomes. By using the optimized experimental conditions, silica particles with diameters of 200, 400, and 600 nm all had success in making fine colloidosomes. The Janus character were characterized by demonstrating the abilities of interfacial assembly and anisotropic structural growth of the resultant products from the optimized procedure. The research provides the conclusions of optimal experimental conditions as references for achieving scalable synthesis of Janus particles with satisfactory quality. This research could serve as a guidance to effective implementation of Granick’s method of Janus particle synthesis.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2024
·
IF 5.4
Yan Pang,Lin Li,Yi Lou,Xiang Wang,Zhaomiao Liu
This article investigates the equilibrium arrangement, self-assembly process, and subsequent curing of amphiphilic snowman-shaped Janus particles at the oil-water interface. The independent Janus particles are in vertical equilibrium state and the contact position of the oil-water interface is at the largest cross section of the particle’s hydrophobic phase. Under the effect of the surface tension and the adsorption of materials, Janus particles may form particle combinations including the particle pairs and the particle triangle, whose inner and outer sides have the liquid surface exhibiting completely opposite contact angles. Particle combinations form stable parallel double-chain structures with diverse shapes after the self-assembly process. However, the single Janus particles attain a state of mechanical equilibrium under the influence of surrounding particles, enabling them to assemble into regular array structures. The relationship of interfacial tension coefficient between phases can be changed by adjusting the oil-water system, which leads to variations in the self-assembly speed and the final arrangement results. The thin-film with uniformly distributed vertical particles is achieved by replacing the underlying deionized water with a curing agent. Based on the understanding of the interactions between irregularly shaped Janus particles at the oil-water interface, it will be convenient to achieve the controllable self-assembly and widely applications of these particles.
研究领域:
材料科学
·
界面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Yajie Hou,Yiming Li,Lisha Wang,Dafan Chen,Mutai Bao,Zhining Wang
Application of dispersants is one of the widely used oil spill response strategies. With the growing concern for particulate emulsifiers , applying amphiphilic Janus particles to emulsify oil in seawater has been examined in this paper. Amphiphilic Janus particles with a combination of colloidal particles and amphiphilic characteristic are found to show a highly effective emulsification for various oils in seawater and overcome several drawbacks of conventional chemical dispersants. We report the synthesis of amphiphilic Janus silica particles (JSPs) as a novel oil spill dispersant and confirm their amphiphilicity by various techniques. The oil-in-seawater emulsion stabilized by JSPs presents small and stable oil droplets in one month, even at a higher volume ratio of oil to seawater and a wide temperature range. It is believed that the small size and high stability of droplets are very important to oil dispersion and eventual biodegradation. Through confocal laser scanning microscopy and scanning electron microscope observations, JSPs were found to anchor tightly at droplet surface and form a dense interfacial particle film to prevent droplets coalescence. The appropriate wettability of JSPs and the reduced interfacial tension contribute to the high interfacial adsorption energy of JSPs. Additionally, JSPs show weak inhibitory effect on oil-degrading bacteria, which is confirmed by bacterial growth curve, resazurin test and oil biodegradation experiment. This study reveals that amphiphilic Janus silica particles hold an impressive capability for environmentally friendly treatment of oil spills.
研究领域:
材料科学
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环境科学
·
海洋学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2025
·
IF 4.2
Hengqian Jin,Shufei Wei,Yunpeng Jiang,Huarong Nie,Xinping Zhang,Aihua He
In this study, snowman-like Janus particles (PDVB/PS@SiO 2 ) were proposed as carriers of Ag nanoparticles (Ag@J) to construct a hierarchical hybrid conductive powders by further admixing with MWCNTs for the development of high-performance microwave-absorbing materials. The Ag@J/MWCNT composite powders have several advantages in microwave absorption, such as the polarization of SiO 2 hemispheres, multiple reflections and scattering of electromagnetic waves in the hollow cavity of PDVB/PS hemispheres, improved conductivity and dielectric loss originating from the dense deposition of Ag nanoparticles and incorporation of MWCNTs. Furthermore, the composite powders allow the interfacial polarization and favorable impedance matching. Notably, the asymmetric hemispheres of the Ag@J particles result in close packing, further reducing the transmission of electromagnetic waves. The Ag@J particles demonstrated a minimum reflection loss (RL min ), indicating their potential application in microwave absorption. When further integrated with MWCNTs, the Ag@J/MWCNT composite powders, containing 36.4 wt% of Ag@J, exhibited strong absorption (−27 dB), wide absorption bandwidth (16.5 − 18 GHz), and a low thickness (5.5 mm). The Janus particles reported in this study show high potential applications in microwave-absorbing powder materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
H. Gui,Y. Li,D. Du,F. Liang,Z. Yang
A new method is proposed to fabricate high-performance phase change material capsules with high thermal storage capacity and increased thermal conductivity . The capsules are achieved by free radical polymerization against the example paraffin/water emulsions stabilized with Janus particles (JPs). It is key that the highly conductive Ag-contained JP adopt parallel lying at the emulsion interface, which is responsible for increasing the interfacial thermal conductivity. Thermal storage capacity can be retained over 90% with no paraffin leakage, which is stable after many cycles of heating and cooling. The high-performance phase change material capsules are promising in effective thermal management in the form of either powder or slurry.
研究领域:
材料科学
·
热能工程
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 3
·455
·
IF 5.3
Xian Qi,Yaxian Du,Ziqiang Zhang,Xu Zhang
Janus particles for oil–water separation have attracted widespread attention in recent years. Herein, we prepared a bowl-shaped Janus particle that could rapidly separate oil and water through a thiol–ene click reaction and selective etching. Firstly, snowman-like composite microspheres based on silica and mercaptopropyl polysilsesquioxane (SiO2@MPSQ) were prepared by a hydrolytic condensation reaction and phase separation, and the effects of the rotational speed and molar ratios on their microscopic morphologies were investigated. Subsequently, bowl-shaped Janus particles with convex hydrophilic and concave oleophilic surfaces were prepared via a thiol–ene click reaction followed by HF etching. Our amphiphilic bowl-shaped Janus particles could remarkably separate micro-sized oil droplets from an n-heptane–water emulsion with a separation efficiency of >98% within 300 s. Based on the experimental and theoretical results, we proposed the underlying mechanism for the coalescence of oil droplets upon the addition of the amphiphilic bowl-shaped Janus particles.Keywords:Janus particles;bowl-shaped particles;thiol–ene click reaction;oil–water separation
研究领域:
材料科学
·
界面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2016
·Vol. 34
·期 3
·367-377
·
IF 1.811
Zhu Ai-di,Guo Ming-yu
In this work, we describe a straightforward approach to produce monodisperse Janus and core-shell particles by using organic solvent free single emulsion droplet-based microfluidic device combining with off-chip polymerization. To accomplish this, methyl methacrylate (MMA) was used as both the oil phase and solvent to dissolve a polymerizable PEGbased macromolecular surfactant, instead of traditional surfactant, and the photo-initiator. Janus particles can be easily obtained by off-chip UV polymerization due to polymerization induced phase separation between PEG and the formed poly(methyl methacrylate). At the same time, core-shell particles can also be easily attained by inverting the original collecting tube several times and then exposing to UV light. These results may extend the scope of microfluidic technology and the studies on polymerization induced self-assembly/phase-separation into easy fabrication of various new functional materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Ruotong Zhao,Tianhao Han,Dayin Sun,Liyan Huang,Fuxin Liang,Zhengping Liu
The Fe3O4@SiO2 paramagnetic Janus particles with phenyl groups and amino groups segmented on two different sides were fabricated by the Pickering emulsion method. Then, the poly(ionic liquid)s were selectively modified onto the amino side via in situ induced ATRP polymerization. Different anions were introduced onto the poly(ionic liquid)s region by exchanging anions to adjust the wettability of the side. Meanwhile, after the PW12O403– anions were employed, the poly(ionic liquid)-modified Fe3O4@SiO2 Janus particles can be used as a catalytic solid emulsifier and degraded water-soluble dyes with the aid of stabilizing emulsion.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Hongwei Wang,Yaoping Lu,Hehang Sun,Chunping Hou,Bolin Gong,Junjie Ou
With an increasing requirement for functional materials, anisotropic Janus particles have gradually developed into highly attractive materials in catalysis, drug delivery, lotion stabilizer and other fields. Herein, non-crosslinked poly(glycidyl methacrylate) (poly(GMA)) served as seed particle, GMA and trimethylolpropane trimethylacrylate (TMPTMA) were utilized as functional monomer and crosslinker, respectively. The composition of water phase consisted of polyvinyl alcohol (PVA) and sodium dodecyl sulfonate (SDS), and 2,2-dimethoxy-2-phenylacetophenone served as photo-initiator. A series of Janus particles with asymmetric morphologies such as lychee-like, acorn-like, half raspberry-like and hamburger-like were fabricated via seed-swelling photoinitiated polymerization. In addition, several parameters such as the ratio of monomers and crosslinker and the type of porogenic solvent were adjusted to improve the anisotropy, dispersity and uniformity. Subsequently, Janus carbonaceous particle was acquired via calcination and utilized as an anode material for lithium-ion batteries. The relevant properties were measured via electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), cyclic performance and constant current charging and discharging testing, demonstrating better performance for electrochemistry. After the second cycle, the stable coulombic efficiency of 95.24% over 100 cycles. Thus, our strategy provides an excellent insight for fabricating Janus carbonaceous particle with controllable morphology, and is expected to have applications in other fields.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Zhang-Qi Feng,Ke Yan,Jiacheng Li,Xuran Xu,Tao Yuan,Ting Wang,Jie Zheng
Paclitaxel is broad-spectrum anticancer drug which has been widely used in clinic. However, traditional drug delivery often suffers from the scarcity of resources and systemic toxic side effects caused by the localization to non-tumor areas, rendering cancer treatment extremely challenging. To address this problem, we developed a novel multifunctional drug delivery system of a poly(lactic- co -glycolic acid) (PLGA) drug-loaded magnetic Janus particles (DMJPs) using electrohydrodynamic (EDH) co-jetting. The DMJPs were loaded with three compartments each with distinct function, i.e. paclitaxel for killing cancer cell, Fe 3 O 4 nanoparticles for target location, and rhodamine B for fluorescence tracing, respectively. The Janus structure of the DMJPs, as demonstrated by the loaded nano-quantum dots CdS/ZnS and CdSe/ZnS in different compartments, enhanced not only the drug loading and encapsulation efficiency but also the cumulative release rate of the loaded drugs from DMJPs in different media. More importantly, DMJPs exhibited specific and high toxicity only to human breast cancer cells (MDA-MB-231), but not to mouse embryonic fibroblasts (NIH-3 T3). Consistently, DMJPs induced the higher lethal effect on cancer cells than paclitaxel suspension of high concentrations. Under guidance of external magnetic field, DMJPs can readily target and accumulate on and inside cancer cells for cell elimination. The specific targetability, selectivity, and toxicity of DMJPs on cancer cells would greatly avoid any potential side effects and reduce the overdose of drugs for conventional drug delivery. This work hopefully provides a new drug delivery system for the development of anticancer drug systems for clinical and precision medicine treatment.
研究领域:
药学
·
肿瘤学
·
纳米医学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）