ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Zhanhe Liu,Zirui Liu,Kechao Zhou,Zihang Chen,Kaihua Shi,Xinyu Wang,Chaoqun Peng,Richu Wang,Shlomo Magdassi,Jin He,Xiaofeng Wang
The additive manufacturing of hardmetals has attracted great attention recently but faces significant challenges in low printing resolution and low mechanical strength. Herein, the fabrication of hardmetal parts with complex structures and high surface quality by vat photopolymerization assisted with a sintering process has been achieved. This was enabled by in situ polymerization-induced microencapsulation of WC powder, which simultaneously enhances the photocuring ability and sedimentation stability of the WC-Co slurry. The WC powder is microencapsulated by a polystyrene (PS, WC@PS) coating with a thickness of ∼20 nm. The curing depth of the WC-Co slurry with WC@PS was dramatically increased from 32 to 336 μm compared to the slurry with original WC, exhibiting an average increment of 650%. The 3D-printed hardmetal parts exhibited a relative density of 99.5%, a Rockwell hardness of 86.9 HRA, and a surface roughness Ra of 2.26 μm, approaching the theoretical limits in classical powder metallurgy-derived WC-Co hardmetal parts. With high density and hardness, it is shown that a printed drilling bit can easily drill through metal sheets. This work paves a path for the vat photopolymerization 3D printing of miniature complex hardmetal components combined with high surface quality and high performance.
研究领域:
材料科学
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增材制造
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表面工程
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 9
·1540
·
IF 5.3
Jia-Xin Wang,Chang Liu,Hao Huang,Rui He,Shengyong Geng,Xue-Feng Yu
The superior optical properties of lead-halide perovskites (LHPs) inspired significant research in cell imaging applications; many encapsulating processes have improved perovskite stabilities with comparable biosafety. Herein, facile solvent evaporation encapsulation based on an oil-in-fluorine emulsion for aqueous-stable and extremely nontoxic LHP microcapsules is described. Perfluorooctane dispersed the emulsifier fluorocarbon surfactant to form a continuous fluorine phase, while LHPs and polymethylmethacrylate (PMMA) were dispersed in 1,2-dichloroethane, then emulsified in the fluorine phase to form an oil-in-fluorine emulsion. CsPbBr3microcapsules with a dense PMMA shell that protect fragile CsPbBr3from the external environment and inhibit lead ion release were obtained after solvent evaporation. The CsPbBr3microcapsules not only retained 91% of fluorescence intensity after exposure to water for 30 d but also possess extremely low cytotoxicity for MCF-7 cells. After exposure to 2 mg/mL of CsPbBr3microcapsules for 48 h, the cell viability remained >90%. The intracellular uptake of CsPbBr3microcapsules indicates its potential use in cell imaging.Keywords:lead-halide perovskites;microencapsulation;oil-in-fluorine emulsion;cell imaging
研究领域:
材料科学
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生物医学工程
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
·
2025
·
IF 5.8
Zexu Wang,Tingting Miao,Yaohui Zhang,Cheng Chang,Ruoxin Wang,Kai Lang,Fei Wang
To address the challenges of paraffin leakage and low thermal conductivity during heat transfer processes, we developed microencapsulated phase change materials (MEPCMs) through an ultrasonic-electrostatic self-assembly strategy. The system features paraffin as the core and graphene nanosheets as a multifunctional shell, with hot-pressing consolidation effectively minimizing interfacial voids and contact resistance. The microstructure and thermal characterization revealed that the graphene shell simultaneously prevents paraffin leakage and establishes a continuous thermal conduction network. With graphene content of 10 wt%, the thermal conductivity of the MEPCMs increased from 0.22 W/(m·K) to 1.86 W/(m·K), accompanied by enhancements of 39.56% and 41.12% in heat storage and exothermic rates, respectively. Additionally, the enthalpy of phase transition of the MEPCMs reached 144.27 J/g. The MEPCMs prepared in this study demonstrated excellent thermal storage capacity and high thermal conductivity, highlighting their potential for applications in thermal energy storage and thermal management.
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DOI
高影响因子
npj Biofilms and Microbiomes
·
2021
·Vol. 7
·期 1
·1-10
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IF 7.29
Yao Mingfei,Lu Yanmeng,Zhang Ting,Xie Jiaojiao,Han Shengyi,Zhang Shuobo,Fei Yiqiu,Ling Zongxin,Wu Jingjing,Hu Yue,Ji Shouling,Chen Hao,Berglund Björn,Li Lanjuan
The low viability during gastrointestinal transit and poor mucoadhesion considerably limits the effectiveness of Ligilactobacillus salivarius Li01 (Li01) in regulating gut microbiota and alleviating inflammatory bowel disease (IBD). In this study, a delivery system was designed through layer-by-layer (LbL) encapsulating a single Li01cell with chitosan and alginate. The layers were strengthened by cross-linking to form a firm and mucoadhesive shell (~10 nm thickness) covering the bacterial cell. The LbL Li01 displayed improved viability under simulated gastrointestinal conditions and mucoadhesive function. Almost no cells could be detected among the free Li01 after 2 h incubation in digestive fluids, while for LbL Li01, the total reduction was around 3 log CFU/mL and the viable number of cells remained above 6 log CFU/mL. Besides, a 5-fold increase in the value of rupture length and a two-fold increase in the number of peaks were found in the (bacteria-mucin) adhesion curves of LbL Li01, compared to those of free Li01. Oral administration with LbL Li01 on colitis mice facilitated intestinal barrier recovery and restoration of the gut microbiota. The improved functionality of Li01 by LbL encapsulation could increase the potential for the probiotic to be used in clinical applications to treat IBD; this should be explored in future studies.
研究领域:
微生物学
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医药科学
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食品科学
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DOI
PubMed
高影响因子
JOURNAL OF NUCLEAR MATERIALS
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2023
·
IF 3.1
Jinhui Tan,Rongxia Huang,Hua-Tay Lin,Malin Liu,Bing Liu,Rongzheng Liu
A novel gel-casting process for fabrication of the fully ceramic microencapsulated (FCM) fuel with high TRISO particles loading capacity was proposed. In the gel-casting process, silicon carbide (SiC) ceramic was used as matrix, and low toxic N-methylol acrylamide was used as organic monomer with appropriate proportion of cross-linking agent, dispersant , and initiator to achieve the strength of green bodies. FCM fuel pellets with high TRISO particles loading capacity were successfully prepared by SPS process. By using the gel-casting method, the volume fraction of TRISO particles could reach 57%, and the average distance between TRISO particles in a plane was 52.4 μm, which could avoid TRISO particles damage introduced by direct contact between the particles. The structure of SiC matrix was dense and complete, and there was a coherent contact between the matrix and TRISO particles, which ensured the performance and reliability of FCM fuel.
研究领域:
核能工程
·
材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Yang Zhou,Chunhai Li,Hong Wu,Shaoyun Guo
Microencapsulated phase change materials (MePCMs) are widely used for thermal energy storage. How to increase the thermal conductivity of MePCMs and maintain the maximum simultaneously is a common concern. In this work, MePCMs were prepared by encapsulating paraffin with graphene oxide (GO) in an aqueous solution through self-assembly and the hybrid shell is constructed through the π-π interaction between GO and graphene nanoplates (GNP). The result showed that ultra-thin layer structure of nano-sized GO and GNP can decrease the mass proportion of shell and improve the encapsulation rate effectively. Compare with GO shell, the hybrid shell can further enhance the thermal conductivity of MePCMs from 0.67 W/ mK to 0.90 W/ mK, while the energy storage capacity is almost the same as that of paraffin. This work proposed a simple and effective method to prepare the MePCMs with high thermal conductivity for thermal energy storage.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
MACROMOLECULES
·
2023
·
IF 5.5
Jiaxing Zhang,Yi Yao,Yangwen Zhang,Di Wu,Wen Li,Andrew K. Whittaker,Afang Zhang
Polymeric microgels form a class of promising materials for various applications based on their highly tunable swelling and cooperative interactions between the cross-linked polymer chains. Here, we report on a convenient route for the fabrication of polymeric microgels through in situ cross-linking polymerization of thermally collapsed macromonomers carrying 3-fold dendritic oligoethylene glycol (OEG) pendants, affording thermoresponsive dendronized microgels with intriguing microconfinement. This methodology has been proven to be versatile and can be used to prepare intelligent microgels through homopolymerization of thermoresponsive dendronized macromonomers, or via copolymerization with either hydrophobic or hydrophilic, and dendronized or nondendronized comonomers. The thermoresponsive microgels of uniform sizes undergo shrinking or swelling by changing the temperature above or below their phase transition temperatures and thus exhibit tunable microconfinement to encapsulated solvatochromic dye molecules. This outstanding capacity for confinement by the microgels is compared to linear copolymers with or without dendritic architectures and is proposed to originate from both dendritic crowding effects and cooperative interactions between polymer chains within the network. This remarkable feature of microconfinement opens a new era for microgels to reversibly encapsulate and protect guest molecules and provides a platform to manipulate the functions of the encapsulated guests through external stimuli.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
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2023
·
IF 3.1
Lei Fu,Rongxia Huang,Rongzheng Liu,Chaohua Liu,Hua-Tay Lin,Malin Liu,Bing Liu
Large-sized fully ceramic microencapsulated (FCM) nuclear fuel pellets were fabricated by a novel tape casting process in this study. The process involved producing a single layer of FCM fuel green tapes embracing TRISO particles by tape casting with silicon carbide ceramic as the matrix. The resulting tapes were stacked vertically and made into green bodies through cold isostatic pressing . Large-sized FCM fuel pellet with diameters over 86 mm was then successfully prepared by pressure-less sintering with AlN-Y 2 O 3 -Sc 2 O 3− MgO as sintering additives. The FCM fuel pellets obtained through this method exhibited a dense structure, flat surface, and no cracks. Thus, the integrated formation of the fuel-free zone and fuel-filled zone could be realized by precisely controlling the fuel-free zone thickness. The TRISO particles were regularly and uniformly distributed in a triangular shape and remained structurally intact. By adjusting the spacing of the TRISO particles in the FCM fuel pellets to a range of 500 to 1500 μm, the volume fraction of fuel particles in the FCM fuels was controlled between 12.8 and 31.7 vol.%.
研究领域:
核能工程
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ke Lei,Jiaming Bao,Xiangyu Zhao,Hao Wang,Deqiu Zou
Due to the advantages of high thermal conductivity, high heat storage density per unit volume and large specific surface area, metal-based microencapsulated phase change material (MEPCM) has a broad application prospect in the field of medium/high-temperature heat storage. However, the problems of thermal expansion and large supercooling seriously restrict its development and application. Our previous research work showed that “double-layer coating, sacrificial inner layer” method can successfully solve the thermal expansion problem of metal-based MEPCM. Based on this method, we aim to further investigate the supercooling suppression of metal-based MEPCM by loading nanoparticles into the core material skillfully when sacrificing the inner layer. Phase change properties of three kinds of MEPCM loaded with different nanoparticles (nano-BN, nano-diamond, and nano-Fe) with the same concentration were compared. It was found that the supercooling suppression effect of nano-Fe was the best. Furthermore, supercooling suppression effect of nano-Fe with different concentrations was compared. The results demonstrated that nano-Fe with a concentration of 0.9% showed the best supercooling suppression effect. In addition, supercooling suppression effect of different particle sizes was compared. The results showed that the supercooling degree of MEPCM decreased by 41.5% and 5.6% when nano-Fe with a particle size of 50 nm and 100 nm was loaded, respectively, indicating that nano-Fe with the particle size of 50 nm is more effective than that of 100 nm. Finally, supercooling suppression effect of different coating methods was compared. The results showed that the supercooling suppression effect of “double-layer coating, sacrificial inner-layer” is much better than that of single-layer coating.
研究领域:
材料科学
·
能源工程
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产品关联
DOI
高影响因子
APPLIED ENERGY
·
2017
·
IF 7.182
Li Zhang,Wenbin Yang,Zhuoni Jiang,Fangfang He,Kai Zhang,Jinghui Fan,Juying Wu
Novel microencapsulated phase change materials (MEPCMs) with high encapsulation capacity and enhanced leakage-prevention performance were prepared by in situ polymerization. For these MEPCMs, paraffin and melamine-formaldehyde resin (MF) are respectively used as core and shell, and graphene oxide (GO) nanosheets, which can be seen as extra protective screen, are situated at the interface between the core and the shell. Effects of GO on morphology, microstructure and properties of MEPCMs were characterized by scanning electronic microscopy (SEM), laser diffraction particle analyzer, atomic force microscopy (AFM), Fourier transformation infrared spectroscopy (FTIR), X-ray diffractometry (XRD), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TG) and paraffin leakage rate test. The results show that the fabricated MEPCMs with GO nanosheets have gradual increasing average diameters from 6.32 to 15.89 μm with an increase content of GO, while the size of MEPCMs without GO is 5.63 μm. When the time of leakage rate test is 50 h, the MEPCMs prepared with 0.5 mg/mL GO aqueous dispersion have considerably high encapsulation ratio of 93.9 wt.%, and the leakage rate is reduced by 93.1% compared with those without GO. The high encapsulation capacity and enhanced leakage-prevention performance might be highly attractive for the application of MEPCMs.
研究领域:
材料科学
·
能源存储与转换
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DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2025
·
IF 6.9
Tingting Luo,Peng Pei,Shixun Hu,Chen Wang,Long Tang
Phase change materials (PCMs) are regarded as an effective backfill material with thermal regulation capability for borehole based shallow geothermal systems. However, the proportion of PCMs needs to be customized according to the thermal stability design of underground systems, which remains challenging. In this study, microencapsulated PCMs (MPCM) were synthesized via the sol–gel method using capric acid and lauric acid in a molar ratio of 13:7. The MPCM exhibited a phase change temperature of 19.39 °C, a latent heat of 141.2 J/g, and a microcapsule coating rate of 71.45 %. The MPCM was incorporated into backfill material to form a composite (MPCM sands) for borehole heat exchangers (BHEs). Its properties were characterized by DSC, multi-channel temperature tests, and 1 HNMR. Experimental results indicated that the composite with 10 wt% MPCM showed the smallest temperature variation under the same heat absorption. A numerical model of a single borehole under intermittent cooling operation was established, revealing that the 10 % MPCM sands composite exhibited superior overall thermal performance. Both experimental and simulation results suggest that the design of PCM-based backfill should comprehensively consider thermal conductivity, phase change temperature, phase change rate, and volume constraints to determine the optimal PCM proportion. The optimal 10 wt% MPCM composite thus achieved a coefficient of performance (COP) of 5.38 and a heat exchange rate of 98.44 W/m, effectively minimizing the potential for underground instability associated with material leakage.
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Chengpan Li,Jing Liu,Qiang Wu,Xiangyu Chen,Weiping Ding
In cryopreservation, the addition of cryoprotectant can change the intra- and extra-cellular osmotic pressure, affect the cell morphology, and induce blebs on the plasma membrane. In this study, the blebs of cells microencapsulated in the alginate microsphere induced by osmotic shock were studied, and the effects of microencapsulation on bleb size and cell viability were determined. Firstly, a coaxial co-flow focusing device was applied to generate cell-laden microcapsules using alginate hydrogel in this paper. Then, cellular blebs induced by DMSO with various concentrations under microencapsulation were compared with that when non-encapsulated, and the dynamic process of cellular bleb was investigated. Finally, the qualitative relationship between bleb size and cell viability in the presence of DMSO was built, and thus the effects of microencapsulation on bleb size and viability were evaluated. The results show that the bleb size is smaller and the cell viability is higher, and cell microencapsulation can significantly inhibit the excessively large blebs generated on the cell membrane and reduce the osmotic damage to cells when loading cryoprotectant and then to improve cell viability during cryopreservation. This work can provide insights for optimizing cryoprotectant-loading protocols, offer a new avenue to study cell blebbing, and advance future research on cryopreservation of rare cells and biomaterials.
研究领域:
生物技术
·
低温生物学
·
细胞生物学
·
材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）