FOOD CHEMISTRY
·
2025
·
IF 9.8
Yanping Huang,Zengliu Song,Yang You,Yunqi Li,Tongfei Shi,Jie Xiao
The spatial distribution of fat crystals significantly impacts the stability and digestion properties of emulsions. This study investigated the templating effect of monoglycerides in controlling the spatial distribution of solid fat crystallization within double emulsions. Double emulsions were formulated with glyceryl monostearate (GMS), glyceryl monolaurate (GML), glyceryl monooleate (GMO), beeswax (BW), glyceryl distearate (GDS), and glyceryl tristearate (GTS) in the oil phase. Monoglycerides influenced the spatial distribution pattern of BW crystals, while minimally affecting GDS and GTS. Cooling at 4 °C increased interfacial crystallization without altering distribution patterns. Monoglycerides raised the onset and peak crystallization temperatures and enthalpy in BW emulsions, with GMS showing the most significant effects. Adding GMS slowed nucleation rates and extended induction times, promoting interface crystallization. The templating effect also reduced crystal lamellar thickness, facilitating the transition from β-crystalline to β’ crystalline in BW. These findings provide insights into selecting crystallizing emulsifiers and enhancing double emulsion stability.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 15
·2825-2835
·
IF 3.756
Peng Yang,Ian Rosbottom,Zhonghua Li,Vivek Verma,Songgu Wu,Junbo Gong,Jerry Y. Y. Heng
The nucleation experiments of pimelic acid were investigated in the absence and presence of a template. The results show that the template, malonamide, can selectively induce the nucleation of metastable form II of pimelic acid, while only stable form I of pimelic acid crystallizes under blank conditions. Furthermore, the nucleation of pimelic acid induced by a single crystal template was carried out and the induced crystals were characterized by Fourier transform infrared and micro-Raman spectroscopy. The lattice parameters and functional groups of the template and pimelic acid were analyzed, and it is inferred that functional groups play a critical role in the selective nucleation of pimelic acid. In addition, the surface structure of the template crystal was analyzed, and the result shows that the amide groups at both ends of the template molecules are exposed on the (111) and (011) faces, making these faces more likely to induce the nucleation of pimelic acid. The interaction energy, adsorption energy and mean square displacement analysis further verified the induction effect of the template faces on the pimelic acid molecules. The simulation results show that the interaction between the (111)/(011) faces and pimelic acid molecules is obviously stronger than that for other crystal faces. This study investigates the mechanism of heterogeneous nucleation at the molecular level, especially from the perspective of the effective faces, which may provide guidance about the control of polymorphs and selection of templates.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2015
·
IF 4.529
Zhijie Liang,Zhiwei Zhaob,Tianyi Sun,Wenxin Shi,Fuyi Cui
In this study, mesoporous silica (meso-silica) MCM-41 and those with the templates retained were synthesized and characterized. Adsorption capacities of the synthesized materials towards typical quinolone antibiotic pollutants, enrofloxacin and norfloxacin as representative, were investigated, and effects of the alkyl chain length of the templates on the adsorption capacity were evaluated. The results of this study indicated that the retained templates enhanced the adsorption capacities ( Q max ) of the meso-silica MCM-41 toward hydrophobic enrofloxacin, but had an inhibitory effect on that towards hydrophilic norfloxacin, which were attributed to the hydrophobic inter-environment created by the long alkyl chains of the retained templates. Importantly, the adsorption capacity increased with the increase of the alkyl chain length of the retained templates.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Energy Research
·
2022
·
IF 3.858
Ye Xiaodong,Jiang Yangyang,Chen Xi,Guo Benshuai,Mao Songbai,Guo Yafei,Zhao Chuanwen
Electrochemical CO2 reduction to CO using copper-based catalysts has been recognized a promising approach to realizing anthropologic carbon cycle. However, copper-based catalysts face the challenges of low reduction activity and poor selectivity in CO2 reduction reaction. Tuning particle size and oxygen vacancy represents an efficient strategy for boosting their activity and selectivity. Herein, we reported the preparation of nanostructured CuO catalysts for selective electrochemical CO2 reduction to CO. Several templates were employed in the template-assisted hydrothermal process to regulate the particle size and oxygen vacancy. Structure-property-activity relationships of the CuO nanostructures depend on the template effect. CuO-PVP and CuO-SDS synthesized using polyvinylpyrrolidone (PVP) and sodium dodecyl sulfate (SDS) as templates exhibited smaller particles sizes and higher concentrations of oxygen vacancy defects. Under the applied potential of −0.93 V vs. RHE, the desired CuO-PVP and CuO-SDS catalysts exhibited good CO2 reduction activity with high electrochemical surface area normalized partial current density of 2.21 and 1.37 mA/cm2 for CO production and outstanding CO selectivity with high faradaic efficiencies of 48.2 and 50.5%. Density functional theory (DFT) calculations indicated that oxygen vacancies in the CuO nanostructures not only promoted CO2 adsorption and activation but facilitated CO desorption from the catalyst surface, and therefore boosted the activity and CO selectivity in CO2 reduction. The results have deepened the understanding of the structure-property-activity relationships of CuO catalysts, and these will provide guidance for designing highly efficient and robust catalysts for electrochemical CO2 reduction to CO.
研究领域:
材料科学
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电化学
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环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yuhang Zheng,Jiayi Wu,Liji Zhang,Yafei Guo,Zhihao Xu,Yu Huang,Pu Huang,Jubing Zhang,Chuanwen Zhao
Alkali metal salts (AMS) promoted MgO with high CO 2 uptakes represents a promising adsorbent candidate for CO 2 capture. The AMS-MgO composite adsorbents are facing the challenges of increased pressure drop or elutriation when employed in dual fixed-bed reactor or twin circulating fluidized-bed configurations. Granulation by the extrusion-spheronization technique represents an effective problem-solving strategy. However, textural properties and CO 2 uptakes of MgO-based adsorbent pellets might be adversely affected by the granulation process. In this work, AMS-MgO composite adsorbent pellets were prepared by the extrusion-spheronization method. Citric acid (CA), ammonium bicarbonate (AB), urea (UA) and microcrystalline cellulose (MC) were employed as pore-forming templates to improve the porous structures and CO 2 uptakes of the AMS-MgO pellets. CO 2 uptakes and adsorption kinetics of the adsorbent pellets were studied using a fixed-bed reactor. Effects of granulation and pore templating on the structure-performance relationships of the AMS-MgO pellets were unraveled. Granulation had resulted in the remarkable decrease in CO 2 uptake from 10.87 to 4.24 mmol CO 2 /g due to the impaired textural parameters. The employed sacrificial templates endowed the AMS-MgO pellets with enhanced CO 2 uptakes and improved carbonation kinetics. This was associated with extended surface area and expanded pore structures due to gas liberation in the pyrolysis of templates, which had facilitated the kinetics of CO 2 bulk diffusion. The desired AMS-MgO-MC pellet modified with MC template showed a high CO 2 uptake of 7.54 mmol CO 2 /g in 50%CO 2 at 340 °C, and its CO 2 uptake was stabilized around 5.0 mmol CO 2 /g within 20 cycles. Besides, the AMS-MgO-MC pellet also exhibited good mechanical properties. The results will guide the rational design of highly efficient and robust MgO-based adsorbent pellets for CO 2 capture applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 23
·期 5
·1133-1141
·
IF 1.385
Xu Feigao,Liu Heng,Li Dan
Xerogels’ formation in the hydrolysis and condensation reaction of tetraethyl orthosilicate (TEOS) was studied by varying pH through adopting three different type basic catalysts (n-octylamine, dodecylamine and tetradecylamine), respectively. The effect of different templates to the formation of xerogels was investigated and characterized by FTIR, N 2 physisorption, TG-DSC and SEM analysis. The results showed that the morphology and textural characteristics of the xerogels prepared in three kinds of organic amine solutions were quite different. The texture of xerogels became more compact after addition of hydroxyl-terminated polydimethylsiloxane (PDMS-OH). Comparing with dodecylamine and tetradecylamine, n-octylamine is more suitable as catalyst to TEOS/PDMS for stone consolidation.
研究领域:
材料科学
·
文物保护
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 7
·1752
·
IF 3.057
Xuelei Wang,Zhaojun Dong,Chao Meng,Wei Wang,Hairui Yang,Xizhun Zhuo,Shaobin Yang
Four metal phosphites/phosphates crystal materials C8N4H34Al2P4O18(1), C3N2H17GaP2O8(2), H5In2P3O10(3), and H9In2P3O13(4) have been solvothermally synthesized by organic amines in the presence of mixed solvents. Structural analyses indicate that compound 1 and 2 show one-dimensional (1D) chain structures; compound 3 and 4 are three-dimensional (3D) inorganic open-framework indium phosphites. Organic amines show different mechanisms in the four compounds. The 2,2′-bipyridine organic amine acts as a template source and it breaks down small molecules, which enter into the structure of compound 1. For compound 2, 1,2-propanediamine has a role as protonated template and it forms a hydrogen bond with the inorganic skeleton structure. As for compound 3 and 4 without the organic template, the benzylamine and 2,2′-bipyridine mainly serve as structure-directing agent. Especially, compound 3 has an odd seven-ring channel, and compound 4 contains 3D intersecting six-ring, eight-ring, and 10-ring channels. X-ray diffraction (XRD), scanning electron microscopy (SEM), CHN, inductive coupled plasma (ICP), Infrared (IR), and thermal gravimetric (TG) analyze the four compounds.Keywords:metal phosphites/phosphates;crystal structure;helical channel;organic amine;templating effect;solvothermal synthesis
研究领域:
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Chenchen Xiong,Yang Zhou,Yanji Jin,Chao Liu,Pan Feng
Calcium silicate hydrates (C-S-H) are the strength sources of cement-based materials. However, the arbitrary packing of C-S-H particles at the nanoscale limit the mechanical properties considerably. In this study, we achieved high-order growth and improved mechanical properties of C-S-H by polymer addition and fine-tuning of the pH value. We found that a proper initial condition contributes to a uniform dispersion of colloidal C-S-H particles, which is essential for subsequent ordered growth. On the basis of stable dispersion, an accurate control of increasing pH values can induce the high-order and dense growth of C-S-H, which obtains a significantly higher elastic modulus as twice as traditional C-S-H. Furthermore, the polymer steric hindrance effect in low pH condition and templating effect of long chain in the higher pH condition explained the well-arranged growth of C-S-H with the interaction to polymer. We hope this highly ordered C-S-H may pave the way for designing tougher and more durable cement-based materials.
研究领域:
材料科学
·
土木工程
·
化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）