CELLULOSE
·
2018
·Vol. 25
·期 7
·4067-4078
·
IF 3.809
Xuan Junji,Tian Jintao
The cellulose colloidal particles with good photochromic and photoluminescent performances had been developed in aqueous solution based on a spiropyran-grafted filter paper cellulose (SP–cellulose) in this study. The insoluble filter paper cellulose dramatically became soluble in ethanol after grafting a spiropyran derivative onto its backbone via esterification. During this process, the optical properties of the spiropyran had been successfully inherited. With the aid of ultraviolet and visible light, the obtained SP–cellulose colloidal particles showed light-induced tunability on both photochromism and photoluminescence, corresponding to the significant change of the spiropyran between weak polar ring-closed spiropyran and strong polar ring-opened zwitterionic merocyanine. Based upon this result, the SP–cellulose colloidal particles were finally obtained in water by follow-up dialysis process. In comparison to the pure spiropyran showing poor optical properties in mixed solvent of ethanol/water, the obtained SP–cellulose colloidal particles in water showed good photochromic and photoluminescent performances as well as fine stability. Considering also the raw material of filter paper being cheap and easy to get as well as the facile preparation process of the functional colloidal particles, our experimental results may bring about more promising applications of spiropyran species and water-insoluble cellulose in aqueous medium.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Xiaoran Wu,Xiang Xue,Jinghang Wang,Hewen Liu
Phoretic swarming and collective transport of colloidal particles in response to environmental stimuli have attracted tremendous interest in a variety of fields. In this work, we investigate the light-actuated motion, aggregation, and light-guided long-distance mass transport of silica microspheres in simple spiropyran solutions under the illumination of UV spot sources. The phototactic motion is confirmed by the dependence of swarming on the illumination intensity and spiropyran concentrations, ON–OFF switching tests, pattern-masked UV sources, etc. The aggregates formed via swarming of silica spheres can chase after a moving UV source, however, relying on a critical speed of the UV source. Only when the UV source speed is below the critical value, the aggregates follow the UV spot at a constant relative speed to the light spot. Analysis on the shape of silica microsphere currents indicates that continuous illumination of the UV spot source and resultant chemical gradients are important for the formation of steady microsphere currents. Light-guided aggregation and long-distance mass transport are interesting for targeted delivery and remote-controlled enrichment of environmental hazards.
研究领域:
材料科学
·
物理学
·
化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Yanlin Li,Wenyuan Duan,Xuegang Lu,Sen Yang,Xiaoxiang Wen
Well-defined Fe 3 O 4 @SiO 2 composite colloidal particles decorated with Ag nanoparticles were successfully synthesized through a simple chemical approach. These particles self-assembled into 1D chain-like photonic structures under the induction of magnetic field and diffract tunable structural colors. The hue and brightness of the structural colors are related to Ag nanoparticles deposited on the particles surface and its brightness increases with the increase of Ag concentration. This phenomenon could be the result of the superposition of photonic bandgap formed by photonic crystals and possible plasmonic property, as well as capability in absorbing stray light of Ag nanoparticles. As-prepared Fe 3 O 4 @SiO 2 @Ag colloidal particles have great potential to be applied in many crucial areas such as color displaying, biological detection and anti-counterfeiting technology.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 14
·2310-2319
·
IF 3.382
Yanlin Li,Xuegang Lu,Sen Yang,Wenyuan Duan,Yin Zhang,Chao Zhou,Kaili Li,Yanjun Zhang,Qian Shi
Monodisperse CoxFe3–xO4 colloidal particles with uniform size and tunable composition have been prepared using a one-step hydrothermal method. Magnetic measurements reveal the typical ferromagnetic nature of the material with a saturation magnetization (Ms) of up to 75.6 emg g−1 and a coercivity (Hc) of 810 Oe at room temperature. The synthesized colloidal particles can be highly dispersed in aqueous solution and show quick magnetic response. Under the induction of an external magnetic field, the colloidal particles in suspension will be assembled into a colloidal array and selectively reflect visible light so that bright structural colors are generated throughout the visible wavelength range. This finding reveals that in addition to traditional superparamagnetic colloidal particles (such as Fe3O4 and MFe2O4 (M = Zn, Mg, Mn, and Ni)), hard magnetic CoxFe3–xO4 with relatively high coercivity can also be used as a candidate material for constructing magnetically responsive colloidal photonic crystals with potential applications in color displays, biological detection and anti-counterfeiting technology.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
STARCH-STARKE
·
2020
·
IF 2.226
Rongli Zhang,Fangwen Chu,Yunqin Hu,Huiling Hu,Yulong Hu,Huan Liu,Chaofei Huo,Hao Wang
A photo-crosslinking cinnamic acid-modified starch (CA-St) copolymer is synthesized through an esterification reaction using 4-dimethylaminopyridine and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide as catalysts. The structure of the CA-St is confirmed by 1 H nuclear magnetic resonance and infrared spectroscopy. Using the nanoprecipitation method, the photo-crosslinking CA-St copolymer is aggregated into colloidal particles (CPs). The formation process and photo-crosslinking of CA-St CPs are evaluated in terms of size distribution, and ultraviolet and visible spectrophotometry. The scanning electron microscopy shows that the CA-St CPs comprise spherical particles with a diameter of approximately 410 nm. This type of photo-crosslinking CP has potential applications in nano- and biotechnology fields.
研究领域:
材料科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2015
·Vol. 3
·期 8
·1667-1676
·
IF 4.726
Jiadi Sun,Ye Zhu,Long Meng,Wei Wei,Yang Li,Xiaoya Liu,Yufeng Zheng
We report a potential example of using surface functionalization to provide magnesium alloys (Mg–Ca) with controlled release and corrosion resistance properties. A key feature of this approach is to treat the Mg–Ca surfaces with nanoparticles via electrodeposition that can stably load and controllably release bioactive agents or drugs. These photo-cross-linkable and nano-scale particles were prepared by the self-assembly of an amphiphilic poly(γ-glutamic acid)-g-7-amino-4-methylcoumarin (γ-PGA-g-AMC) with encapsulation of a vitamin; moreover, the size and morphology of the resulting particles were studied. Fluorescence microscopy analysis indicated that Vm was effectively incorporated into the γ-PGA-g-AMC particles. Scanning electron microscopy (SEM) images showed that the colloidal particles could be uniformly electrodeposited on the Mg–Ca alloys. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analyses confirmed the successful anchoring of the particles. After the surface electrodeposition of self-assembled colloidal particles, the in vitro degradation results show that deposition of the particles was found to reduce the degradation rate of the magnesium alloys; moreover, the vitamin was controllably released for up to 20 days. Furthermore, the Mg–Ca substrate functionalized with colloidal particles containing a vitamin significantly promoted the attachment, proliferation and spread of NIH-3T3 normal cells. The entire strategy may be used in various medical devices to create coatings for improved biomedical performance.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Guo-Xing Li,Jiafei Yu,Xiao-Wei Qu,Ren-Kun Qing,Ting-Ting Cui,Qing Li,Jun Li,Su Chen
Photonic crystals (PCs) are ordered structure materials that can reflect visible light at specific wavelengths and infrared. On the basis of this property, PCs can be regarded as a thermal management material with reflection cooling function. Thermal management is of great significance to accelerate wound healing. Thus, from the implementation point of view, it is very desirable to design a high-performance wound dressing based on PCs for wound healing. Here, we propose an easy-to-perform strategy to synthesize colloidal particles with core–shell structure to construct high-performance colloidal photonic crystal (CPCs) films. Benefiting from the structure of hard core and soft shell with low glass transition temperature (Tg), colloidal particles can be assembled tightly and seamlessly. The thermal insulation properties of CPCs films were studied. And the results show that the maximum temperature difference is 5.4 °C compared with the substrate. Finally, we assembled colloidal particles on fibrin gels and explored their advantages in wound healing. We believe that this work not only provides a feasible pathway to prepare cracked-free CPCs films but also paves the way for broadening the application of CPCs in thermal management and wound healing.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2022
·
IF 2.731
Quan Zeng,Ting Xu,Qinshu Kang,Shengqing Li
The existence of inorganic elements in natural water is heterogeneous due to the suspended micro colloidal and nanoparticles. In this work, the signals of Fe, Cu, Cd, Pb content in natural water samples collected from a city lake were examined using the single-particle inductively coupled plasma mass spectrometry (ICP-MS) under the time resolved detection mode. Total numbers, data distributions and central values of the detected signals were obtained based on statistical analysis using the Excel and the Origin software. Both fractionation filtration (0.22, 0.45 and 3.0 µm membranes) and centrifugation (2000, 4000, 6000 and 8000 rpm rotating speed) have a significant effect on the detection of metals coexisted in the natural colloidal particles (NCPs) in water. Notable number of single-particle signals still presents in the lake water samples even after the pretreatment of 0.22 µm filtration or 8000 rpm centrifugation, which reveals the ubiquitous existence of micro aggregates or colloids in natural water. Sampling with online dilution is proved to be a direct, simple and effective method for the implementation of time resolved analysis of metallic micro NCPs in lake water by ICP-MS, especially for elements with high dissolved concentration. The results enhance the knowledge of how-to evaluation of the quantity and chemical stability of metal-containing aggregates, colloids and nanoparticles that may exist in natural water.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2016
·
IF 2.76
Ye Zhu,Qiong Hu,Wei Wei,Chenglin Yi,Xiaoya Liu
In this study a type of colloidal particles with a cross-linked poly(divinylbenzene) (poly(DVB)) core and a poly(acrylic acid- r -styrene) (PAS) shell were directly prepared by reversible addition-fragmentation chain transfer (RAFT)-mediated cross-linking copolymerization. The particle size, morphology, zeta potential and pH responsibility were studied. The emulsification study showed that PAS-Poly(DVB) colloidal particles were effective particulate emulsifiers when homogenized with various oils including toluene, white oil, isooctyl palmitate, dicaprylyl carbonate, silicone oil, and propylheptyl caprylate. Additionally, the emulsification performance of PAS-Poly(DVB) colloidal particles at different pH values were investigated. Gelled white oil- in -water high internal phase emulsions (HIPEs) were formed at a high oil volume fraction of 80% when the colloidal particles were flocculated at low pH value. The addition of base can trigger the demulsification of the HIPEs, exhibiting a pH-responsive behavior. The effects of oil phase volume fraction on emulsion rheological properties were investigated. Both the emulsion viscosity and storage modulus (G′) progressively increased with the increasing of oil phase volume fraction. These results suggest that our work provides a convenient and feasible way to prepare effective particulate emulsifiers via the direct chemical reaction, and the PAS-Poly(DVB) colloidal particles have promising potential application in the oil industry and preparation and exploitation of smart materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 103
·101267-101276
·
IF 3.289
Hongshan Liang,Bin Zhou,Jing Li,Yun He,Yaqiong Pei,Bin Li
Pickering emulsions are widely used as delivery systems in food, cosmetics, and pharmaceutical industries for the encapsulation and sustained release of hydrophilic compounds. The solid colloidal particles stabilized in oil–water interface can prevent the oil droplets from undesired coalescence and endow additional functionality. In order to impact further protection and pH-responsive deliver of the encapsulated component, we used two kinds of mechanisms. For internal interaction, the excess Ca2+ on the surface of zein–tannic acid (TA)/Ca2+ nanoparticles (NPs) interacted with alginate added to form a second layer. In the case of external gelation, a cross-linking agent (Ca2+) was dissolved in the aqueous gelling bath outside. When added the mixture of the emulsions to Ca2+ solution, alginate–Ca beads were formed to encapsulate the emulsions and further impact the pH-responsive deliver of VD3 in stomach and rapid release of it in small intestine.
研究领域:
食品科学
·
药物递送系统
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2023
·Vol. 104
·期 2
·643-654
·
IF 4.1
Bojia Li,Xinyi Wang,Jin Gao,Hongshan Liang,Di Wu,Shang Chu,Xiangwei Zhu,Bin Zhou
BACKGROUND Interface modification driven by supramolecular self-assembly has been accepted as a valuable strategy for emulsion stabilization enhancement. However, there has been a dearth of comparative research on the effect of simple complexation and assembly from the perspective of the responsible mechanism. RESULTS The present study selected zein and tannic acid (TA) as representative protein and polyphenol modules for self-assembly (coined as TA-modified zein particle and TA-zein complex particle) to explore the surface properties and interfacial behavior, as well as the stability of constructed Pickering emulsions to obtain the regulation law of different modification methods on the interfacial behavior of colloidal particles. The results demonstrated that TA-modified zein colloidal particles potentially improved the emulsifying properties. When the TA concentration was 3 mmol L −1 , the optimized TA-modified zein particle was nano-sized (109.83 nm) and had advantageous interfacial properties, including sharply reduced surface hydrophobicity, as well as a low diffusion rate at the oil/water interface. As a result, the shelf life of Pickering emulsion containing 50% oil phase was extended to 90 days. CONCLUSION Through multi-angled research on the properties of the interfacial membrane, improvement of emulsion stability was a result of the formation of viscoelastic interfacial film that resulted from the decrease of absorption rate between particles and interface. Using refined regulation to investigate the role of different sample preparation methods from a mechanistic perspective. Overall, the present study has provided a reference for TA to regulate the surface properties and interface behavior of zein colloidal particles, enriched the understanding of colloidal interface assembly, and provided a theoretical basis for the quality control of interface-oriented food systems. © 2023 Society of Chemical Industry.
研究领域:
食品科学
·
界面化学
·
胶体科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2010
·
IF 3.019
Xiaoya Liu,Chenglin Yi,Ye Zhu,Yiqun Yang,Jinqiang Jiang,Zhenggang Cui,Ming Jiang
A new type of copolymer containing two alternating segments, poly-(styrene- alt -maleic anhydride)- co -poly (7-(4-vinylbenzyloxyl)-4-methylcoumarin- alt -maleic anhydride) P(St- alt -MAn)-co-P(VM- alt -MAn)(PSMVM), was prepared. The copolymer self-assembled into nanoparticles with internal microphase structures in water because the hydrophilicity of segment P(VM- alt -MAn) is higher than that of P(St- alt -MAn). The particle size, morphology, ζ potential and surface properties and their dependence on the pH and slat concentrations were studied with a combination of techniques. The nanoparticles of PSMVM showed surface activity and pH sensitivity for producing Pickering oil-in-water emulsions. The emulsion volume increased and the size of oil/water droplet decreased with increasing salt concentration. Furthermore, cross-linked nanoparticles (CLPs) were obtained by photo-dimerization of the pendent coumarin groups in PSMVM under UV irradiation. The emulsions produced by using the CLPs as emulsifiers showed even better stability upon standing. Solid oil-phase droplets were obtained by preparation of CLPs-stabilized Pickering emulsions with an oil phase of styrene containing the initiator AIBN followed by the polymerization of styrene. Thus, the enrichment and aggregation of the CLPs on the emulsion droplets was visible because the solid droplets remained unchanged during the SEM sample preparation.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）