ADVANCED MATERIALS
·
2024
·
IF 27.4
Rui Wang,Feng-xin Luan,Zi-shu Wang,Xiao-chi Liu,Xiu-guo Zhang,Kai Wang,Wei Mu,Feng Liu,Da-xia Zhang
Multiscale particle size functional pesticide carriers can provide more efficient protection for plants, but this protection is difficult to achieve via single-scale formulation technology. This study presents a novel one-step method for the preparation of lignin-based micro/nanocapsules with controllable proportions within a unified system. This strategy enables the adjustment of the proportion of nanocapsules to between 18.81% and 85.21%. The microcapsules (MCs) vary in diameter from 2 to 3 µm, whereas the nanocapsules (NCs) span from 160 to 220 nm, with an encapsulation efficiency exceeding 90%. An increased proportion of NCs in the system leads to faster release, heightened sensitivity to UV light, and enhanced penetration into the leaves. During Phytophthora capsici (P. capsici) infection, the NCs in the leaves interact with the defensive enzymes of the plant to quickly respond. Moreover, an optimal balance of MCs and NCs is key to effective fungicide use, not just a higher concentration of NCs. A 65:35 ratio of NCs to MCs ensures effective inhibition of P. capsici outside leaves and a rapid response to leaf invasion. This study enhances fungicide efficiency and advances the development of nanoresponsive fungicides to promote sustainable agricultural practices.
研究领域:
农业科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xueping Huang,Aiping Wang,Jian Luo,Yue Gao,Lei Guan,Peng Zhang,Feng Liu,Wei Mu,Beixing Li
Recently, size-controlled pesticide microcapsule (MC) delivery systems have played an important role in precision farming development; however, the potential environmental hazards of MCs with different particle sizes have not been fully characterized. In this study, we prepared a series of lambda-cyhalothrin (LC)-MCs with nano and micron-scale capsule sizes (average diameters of 209.4 nm, MC-N; 2.41 µm, MC-S; 4.87 µm, MC-M; and 12.41 µm, MC-L). The assessment results showed that the release and sedimentation behavior of LC-MCs in water and toxicity to zebrafish at three life stages were all particle size-dependent. As the diameter distribution of approximately 100 nm extended to the micron scale (~27 µm), the capsules released more slowly and sunk more quickly in water. In addition, micron-sized LC-MC exposure resulted in significantly less fish mortality and malformations of larvae and embryos compared with nanosized LC-MC exposure. The highest accumulation of MC-N in the gill and the severest toxicity to larvae suggested that the smaller size and stronger permeability of nanocapsules would pose unpredictable consequences for nontargeted organisms. The obvious toxicological differences of LC-MCs toward aquatic organisms implies that regulating MC production in an appropriate size range is an important prerequisite for achieving efficient but safe pesticide applications .
研究领域:
环境科学
·
毒理学
·
农业科学
·
水生生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Xian-peng Zhang,Jian Luo,Da-xia Zhang,Tong-fang Jing,Bei-xing Li,Feng Liu
In this paper, porous microcapsules with tunable pore sizes were prepared using interfacial polymerization by employing a temperature-responsive cross-linking agent above its so-called cloud point temperature ( T scp ). The influences of porosity on the surface morphology , release profile and biological activity of the microcapsules were investigated. The results showed that both pore size and pore density could be controlled by regulating either the amount of cross-linking agent or the ratio of core material to shell material. Furthermore, the porosity of the microcapsules determined their release properties and further regulated the bioactivity of the microcapsules. In addition, the mechanism of pore formation was confirmed by investigating the morphology of microcapsules below the T scp . The microencapsulation methodology described here is convenient and versatile, which can be easily extended to encapsulate a broad range of lipophilic core materials.
研究领域:
药剂学
·
生物材料
·
纳米医学
·
药物递送
·
高分子科学
✓ 已验证
DOI
高影响因子
FIBERS AND POLYMERS
·
2016
·Vol. 17
·期 11
·1849-1857
·
IF 1.022
Zhang Bin,Han Jian
The poly(vinyl acetate) (PVAc)/zinc oxide (ZnO) microcapsule and PVAc/titanium dioxide (TiO 2 ) microcapsule were synthesized via in-situ emulsion polymerization method. The PVAc/ZnO microcapsule and PVAc/TiO 2 microcapsule were characterized by fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis(TG), transmission electron microscopy (TEM), and UV-visible spectroscopy (UV-vis). Effect of PVAc/ZnO microcapsule and PVAc/TiO 2 microcapsule on properties of poly(lactic acid) (PLA) was evaluated by UV-vis, SEM and mechanical properties test. The results showed that the addition of PVAc/ZnO and PVAc/TiO 2 microcapsules as a UV-blocking additive could significantly enhance UV-blocking property of PLA/PVAc/ZnO microcapsule composites and PLA/PVAc/TiO 2 microcapsule composites compared with pure PLA, PLA/ZnO composites and PLA/TiO 2 composites. The mechanical properties of PLA/PVAc/ZnO microcapsule composites were better than those of PLA/ZnO composites due to good dispersability and compatibility of PVAc/ZnO microcapsule in PLA matrix. Also, the mechanical properties of PLA/PVAc/TiO 2 microcapsule composites were better than those of pure PLA and PLA/TiO 2 composites. This study demonstrates the great potentials of the intrinsically UV shield additive PVAc/ZnO and PVAc/TiO 2 microcapsules in the application of high performance matrix resin and composite material.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2016
·
IF 3.897
Huan Yi,Yonghong Deng,Chaoyang Wang
Facile and efficient encapsulation of epoxy and tetraethylenepentamine (TEPA) in polyurea (PU) microcapsules are accomplished with Pickering emulsion templates by one-step, interfacial polymerization . The formation of microcapsule is deftly achieved by lightly shaking Pickering emulsions. The whole process is time andenergy saving hardly with any waste and residual. Epoxy microcapsules keep the spherical shape with core content of more than 90 wt%. Amine microcapsules shrink a little for evaporation of water and the conserved TEPA after air-dried is 82.1 wt%. The shell walls of two microcapsules are about 1 μm. With the protection of PU shells, both microcapsules exhibit excellent thermal resistance . Furthermore, self-healing function of epoxy and amine microcapsules is measured by incorporating microcapsules into epoxy coating , and tested by brine-submersion corrosion-accelerating experiment. The dual core self-healing coatings demonstrate excellent self-repairing performance with the crack of embedded microcapsules and reaction between epoxy and amine. The core materials can outflow from microcapsules and form isolations for metal substrate from corrosion hazard, therefore, make for good self-repairing and preserving function of the self-healing coating.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Green Chemical Engineering
·
2020
·
IF 0
Yun Zhao,Min Zhang,Xin Wen,Zhonghua Xiang
Microcapsules have been widely used in drug carriers, nano/microreactors, artificial organelles for their empty space and functional shell. Microcapsules synthesized from spherical liquid-liquid interface show ultrathin shell and large cavities. However, spherical liquid-liquid interfaces generated by stirring or sonicating are difficult in controlling the droplet size and preventing their coalescence, which results in inhomogeneous capsules. Here, we demonstrate a microfluidic interfacial synthetic method to produce microcapsules using the hot covalent organic polymers (COPs) coupled with Schiff-base reaction. A very high throughput of uniform and individual microdroplets about ~1400 min −1 was generated under high flow rate for COP capsules fabrication. Acidic catalyst promoted amine and aldehyde condensation that reacted less than 1 s assured the polymerization occurred at the liquid-liquid interface regardless of the diffusion intensification in microfluidic system. COP capsules with shell thickness around 50 nm were flexible enough to response to slight interior capillary force and exterior filtration force to form origami structure and sealed flat membrane, respectively. Each of the interfacial synthesized capsule expressed large capacity by encapsulating 1.41 × 10 −2 μg SiO 2 nanoparticles as theoretically calculated. Thus, these properties make the COP capsules promising in, but not limited to, fast drug delivery and microreactors.
研究领域:
材料科学
·
化学工程
·
生物医学工程
✓ 已验证
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Bo Mu,Xiaoqin Dai,Yunpeng Li,Wei Li,Bangrui Kou,Wenyi Zhang,Kang Du,Yunan Li,Li Tian,Jinfeng Cui,Baoping Yang,Junhong Guo,Li Chen
Self-lubricating microcapsules can reduce the coefficient of friction/wear and improve the tribological properties of polymer composites. Impregnation of prefabricated shell with core substances is a versatile and applicable route to obtain the microcapsules. In this work, double shell nanocapsules (PA@C HSM) with particle size of 448 nm, shell thickness of 65 nm are obtained by incorporating paraffin wax (PA) into the pre-synthesized hollow carbon nanospheres (PHCs)and then packaged by co-depositing with polydopamine (PDA) and polyethylenimine (PEI). The PDA/PEI transition shell increase the surface roughness of the nanocapsule and enhance the compatibility with the polymer matrix which will contribute to the improved oil storage ability and thermal stability of the nanocapsules as well. The distinguished mechanical interlocking and chemical interface bonding between PDA/PEI layer and EP matrix effectively facilitates mitigating the unfavorable impact of PA@C HSM on the mechanical properties of the composite with the modulus of the 7.5 wt% PA@C HSM/EP composites increased by 17.44 %. As for the tribological performance of PA@C HSM/EP composite, the tribological properties are boosted remarkably and the friction coefficient and wear rate of 7.5 %PA@C HSM/EP composite are reduced by 77.69 % and 98.79 % compared with pure EP material.
研究领域:
材料科学
·
摩擦学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 31
·17527-17541
·
IF 4.22
Xue Ying,Li Chunmei,Liu Jin,Tan Jiaojun,Yin Hangyu,Yao Laifeng,Zhang Qiuyu
Abstract Using microcapsules as the stabilizers of Pickering emulsion can endow the resulted composite capsules with more storage microcavities, producing new functional and structural materials, which have potential application in the preparation of self-healing microcapsules to achieve multiple healing. However, the preparation and wettability of microcapsule-type stabilizers (MTS) have not been systematically researched. Herein, a facile method to prepare MTS containing a liquid healing agent (dicyclopentadiene, DCPD) was proposed, which exhibited excellent emulsifying properties in Pickering emulsion. MTS with adjustable wettability were successfully prepared and used to fabricate Pickering emulsions with different oil phases. It was found that when the mass ratio of the hydrophobic shell monomer reached 100%, MTS possessed the best emulsifying property and the resulted Pickering emulsion could be stably stored for 30 days. Additionally, via solidifying the activity monomers of the oil droplets, composite capsules with multi-storage cells were successfully prepared which confirmed the strong stability of this emulsion and the appropriate wettability of MTS again, as well as pave a new path for the preparation of new architecture microcapsules. We expected that MTS will be found more useful in encapsulation fields, such as self-healing microcapsules, biological medicine, cosmetics, and textile. Graphical abstract
研究领域:
材料科学
·
化学工程
·
功能材料
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Weidong Yu,Hao Liu,Jialing Tan,Chaoxia Wang
The three-component thermochromic materials have been widely used for temperature monitoring due to abundant colors and thermochromic temperatures. Nevertheless, there are still limitations in depicting broader temperature variations. So we propose to construct a double-stage thermochromic response strategy. We synthesize thermochromic microcapsules with dual thermochromic temperatures by in situ polymerization using melamine–formaldehyde (MF) resin as the encapsulating shell. The thermochromic microcapsules exhibit color changes from pink or blue to white under the control of 6′-(Diethylamino)-1′,3′-dimethylfluoran (DDF) and the crystal violet lactone (CVL), respectively. Furthermore, the thermochromic microcapsules exhibit exceptional thermal properties and possess a uniform spherical morphology. Simultaneously, a double-stage thermochromic fabric is produced using screen printing techniques in order to track variations in the surrounding temperature. The double-stage thermochromic fabric has the ability to alter its color state at 25 °C and 35 °C and further divide the temperature range into four segments: below 20 °C, 20 °C–25 °C, 25–35 °C, and above 35 °C. More interestingly, the double-stage thermochromic fabric still retains the thermochromic property even after being heated and cooled 25 times or immersed in various organic solvents for 24 h. This remarkable characteristic of the double-stage thermochromic fabric offers a promising avenue for temperature display across a wide range.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Kunlin Chen,Jianlin Zhou,Jing Hu,Junhao Zhang,Tianzuo Heng,Changyue Xu,Xuemei Wang,Jingyan Liu,Kejing Yu
Currently, smart and functional textiles have attracted increasing attention for the research on their application in various fields. In this paper, perfluorooctyltriethoxysilane (FAS13)-loaded silica nanocapsules taken as the Pickering emulsifier was applied to stabilize O/W emulsion for obtaining pH-responsive dual-compartmental microcapsules which show a strawberry-like structure with jasmine essence as the core and pH-responsive polymers and silica nanocapsules as the shell. These microcapsules could endow it with multifunctions by functionalizing the fabric, while the preparation and functionalization process is effortless and environmental friendly. Not only does the treated fabric demonstrate the self-healing superhydrophobicity and ultraviolet (UV) resistance because of the hydrophobic FAS13 getting loaded into silica nanocapsules and the surface modification of UV absorbent, it is also capable of the pH control jasmine essence-releasing performance, which allows over 40% of the fragrance to be preserved for three months through the controlled release of jasmine essence from the microcapsules.
研究领域:
材料科学
·
纺织工程
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yang Liu,Gen Li,Haojian Lu,Yuanyuan Yang,Zeyang Liu,Wanfeng Shang,Yajing Shen
Core–shell microcapsules as one type of the most attractive carriers and reactors have been widely applied in the fields of drug screening and tissue engineering owing to their excellent biocompatibility and semi-permeability. Yet, the spatial organization of microcapsules with specific shapes into three-dimensional (3D) ordered architectures still remains a big challenge. Here, we present a method to assemble shape-controllable core–shell microcapsules using an untethered magnetic microcapsule-robot. The microcapsule-robot with the shape-matching design can grab the building components tightly during the transportation and assembly processes. The core–shell feature of the microcapsule effectively prevents the magnetic nanoparticles from interacting with bioactive materials. The assembly results of cell-loaded heterogeneous microcapsules reveal that this strategy not only allows the magnetic microcapsule-robot to work in different workspaces in vitro for the creation of 3D constructions but also offers a noninvasive and dynamical manipulation platform by remotely controlling the position and orientation of the soft and liquid-like microcapsule components individually.
研究领域:
生物医学工程
·
组织工程
·
微纳米技术
·
药物筛选
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2020
·Vol. 12
·期 1
·119
·
IF 3.426
Wei Zhou,Shu-Jie Hao,Guo-Dong Feng,Pu-You Jia,Xiao-Li Ren,Meng Zhang,Yong-Hong Zhou
Although tung oil is renewable, with an abundant production and low price in China, and it is used to synthesize different polyols for rigid polyurethane foam (RPUF), it remains a challenge to improve the properties of RPUF by redesigning the formula. Therefore, we propose four novel compounds to strengthen the properties of RPUF, such as the catalyst-free synthesis of tung oil-based polyol (PTOK), aluminum phosphate micro-capsule (AM), silica micro-capsule (SiM), and grafted epoxidized monoglyceride of tung oil on the surface of SiO2(SiE), which were designed and introduced into the RPUF. Because of the PTOK with a catalytic function, the foaming process of some RPUF samples was catalyst-free. The results show that the incorporation of AM, SiM, and SiE, respectively, endow RPUF with a better thermal stability at a high temperature, and theT5%,Tmax1, andTmax2of RPUF appeared to be reduced, however, theTmax3and residue rate at 800 °C were improved, which may have a positive effect on the extension of the rescue time in case of fire, and the limiting oxygen index (LOI) value was increased to 22.6%. The formula, containing 25% PTOK made the RPUF environment-friendly. The results were obtained by comparing the pore size and mechanical properties of the RPUF—the AM had a better dispersion in the foam, and the foam obtained a better mechanical, thermal, and flame retardancy.
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）