Ovalbumin(OVA),the main protein in egg white,affects most of the functional properties of egg white protein in food processing.The aim of this study was to investigate the effects of spray drying(SD)and microwave free...Ovalbumin(OVA),the main protein in egg white,affects most of the functional properties of egg white protein in food processing.The aim of this study was to investigate the effects of spray drying(SD)and microwave freeze drying(MFD)on the preparation of hydrolyzed/glycosylated ovalbumin(HGOVA)and provide useful information on the applications of egg protein powders in the food industry.Results demonstrated that the structure of HGOVA was considerably changed,and its functional properties were improved compared with those of native OVA.SD and MFD processing did not lead to dissociation of HGOVA subunits.SD-HGOVA exhibited higher protein solubility,emulsifying activity,foaming capacities,and gel hardness than MFD-HGOVA.However,MFD-HGOVA was better than the SD-HGOVA in terms of color,emulsion stability,foam stability,water/oil absorption capacity,and thermal stability.Selection of an appropriate drying method could enhance the potential applications of HGOVA in the food industry.展开更多
Herein,N-Ti3C2@CNT microspheres are successfully synthesized by the simple spray drying method.In the preparation process,HCl-treated melamine(HTM)is selected as the sources of carbon and nitrogen.It not only realizes...Herein,N-Ti3C2@CNT microspheres are successfully synthesized by the simple spray drying method.In the preparation process,HCl-treated melamine(HTM)is selected as the sources of carbon and nitrogen.It not only realizes in situ growth of CNTs on the surface of MXene nanosheets with the catalysis of Ni,but also introduces efficient N-doping in both MXene and CNTs.Within the microsphere,MXene nanosheets interconnect with CNTs to form porous and conductive network.In addition,N-doped MXene and CNTs can provide strong chemical immobilization for polysulfides and effectively entrap them within the porous microspheres.Above-mentioned merits enable N-Ti3C2@CNT microspheres to be ideal sulfur host.When used in lithium–sulfur(Li–S)battery,the N-Ti3C2@CNT microspheres/S cathode delivers initial specific capacity of 927 mAh g−1 at 1 C and retains high capacity of 775 mAh g−1 after 1000 cycles with extremely low fading rate(FR)of 0.016%per cycle.Furthermore,the cathode still shows high cycling stability at high C-rate of 4 C(capacity of 647 mAh g−1 after 650 cycles,FR 0.027%)and high sulfur loading of 3 and 6 mg cm−2 for Li–S batteries.展开更多
Micro-encapsulation of shrimp oil using the mixture of whey protein concentrate(WPC)and sodium caseinate(SC)(1:1,w/w)as a wall material was carried out.The impact of core/wall material ratios(1:2 and 1:4,w/w)and homog...Micro-encapsulation of shrimp oil using the mixture of whey protein concentrate(WPC)and sodium caseinate(SC)(1:1,w/w)as a wall material was carried out.The impact of core/wall material ratios(1:2 and 1:4,w/w)and homogenizing pressures(13.79 and 27.58 MPa)on characteristics and stability of emulsion was investigated.The size of emulsion oil droplets decreased with increasing homogenizing pressure(P<0.05)but was not influenced by core/wall material ratio(P>0.05).During the extended storage,particle size,flocculation factor(Ff)and coalescence index(Ci)of all emulsions sharply increased,especially in emulsions prepared at 13.79 MPa with a core/wall material ratio of 1:2(P<0.05).After spray drying,micro-encapsulated shrimp oil(MSO)prepared at 13.79 MPa with a core/wall material ratio of 1:2 had the larger size than others(P<0.05).MSO prepared using a core/wall material ratio of 1:4 with homogenizing pressure of 27.58 MPa exhibited higher encapsulation efficiency(EE)(51.3%–52.8%)than others.Thus,both core/wall material ratio and homogenizing pressure directly affected micro-encapsulation of shrimp oil.展开更多
Micro-nano structured Li Fe（1-x）MnxPO4/C（0≤x≤0.05）cathodes were prepared by spray drying,followed by calcination at 700°C.The spherical Li Fe（1-x）MnxPO4/C（0≤x≤0.05）particles with the size of 0.5 to5.0...Micro-nano structured Li Fe（1-x）MnxPO4/C（0≤x≤0.05）cathodes were prepared by spray drying,followed by calcination at 700°C.The spherical Li Fe（1-x）MnxPO4/C（0≤x≤0.05）particles with the size of 0.5 to5.0μm are composed of lots of nanoparticles of 20 to 30 nm,and have the well-developed interconnected pore structure.In contrast,when Mn doping content is 3 mol%（x=0.03）,the Li Fe（0.97）Mn（0.03）PO4/C demonstrates maximum specific surface area of 31.30 m^2/g,more uniform pore size and relatively better electrochemical performance.The initial discharge capacities are 161.59,157.04 and 153.13 m Ah/g at a discharge rate of 0.2,0.5 and 1 C,respectively.Meanwhile,the discharge capacity retentions are～100%after 120 cycles.The improved electrochemical performance should be attributed to higher specific surface,smaller polarization voltage,and a high Li~＋diffusion rate due to the micro-nano porous structure and lattice expansion produced by Mn doping.展开更多
Nanocrystalline Na2ZrO3 was demonstrated as a promising acceptor for CO2 capture at elevated temperatures. The mechanism of nanocrystalline Na2ZrO3 formation from the soft-chemistry route is elucidated by varying prec...Nanocrystalline Na2ZrO3 was demonstrated as a promising acceptor for CO2 capture at elevated temperatures. The mechanism of nanocrystalline Na2ZrO3 formation from the soft-chemistry route is elucidated by varying precursors, preparation methods, and calciantion temperatures, combining detailed characterizations by X-ray diffraction （XRD） and scanning electron microscope （SEM） at different steps in the process. The results revealed that the drying method such as spraying drying and simple evaporation-drying did not influence the final product prop- erties. However both Na and Zr precursors had remarkable influences on the Na2ZrO3 formation. The solid reaction of Na intermediate and nanocrystalline ZrO2 in the calcination was identified as the key step for the Na2ZrO3 formation, where the formation of molten phase Na intermediate was found to be crucial to facilitate the solid reaction. We provided principles for rational design of the chemistry for the Na2ZrO3 formation where the formation of Na intermediate with low melting points is essential. Pure nanocrystalline Na2ZrO3 can be synthesized from a mixture containing sodium nitrate and zirconoxy citrate via the formation of NaNO3 with low melting point. However, it is not possible to form pure nanocrystalline Na2ZrO3 at relatively low temperatures from the mixtures of NaAc/ZrO（NO3）2 or NaCA/ZrOC12 due to the formation of Na2CO3 and NaC1 with high melting points.展开更多
基金Natural Science Foundation of China(No.U1704114)Key Scientific Research Program of Henan Province(No.182102110346,161100110900).
文摘Ovalbumin(OVA),the main protein in egg white,affects most of the functional properties of egg white protein in food processing.The aim of this study was to investigate the effects of spray drying(SD)and microwave freeze drying(MFD)on the preparation of hydrolyzed/glycosylated ovalbumin(HGOVA)and provide useful information on the applications of egg protein powders in the food industry.Results demonstrated that the structure of HGOVA was considerably changed,and its functional properties were improved compared with those of native OVA.SD and MFD processing did not lead to dissociation of HGOVA subunits.SD-HGOVA exhibited higher protein solubility,emulsifying activity,foaming capacities,and gel hardness than MFD-HGOVA.However,MFD-HGOVA was better than the SD-HGOVA in terms of color,emulsion stability,foam stability,water/oil absorption capacity,and thermal stability.Selection of an appropriate drying method could enhance the potential applications of HGOVA in the food industry.
文摘Herein,N-Ti3C2@CNT microspheres are successfully synthesized by the simple spray drying method.In the preparation process,HCl-treated melamine(HTM)is selected as the sources of carbon and nitrogen.It not only realizes in situ growth of CNTs on the surface of MXene nanosheets with the catalysis of Ni,but also introduces efficient N-doping in both MXene and CNTs.Within the microsphere,MXene nanosheets interconnect with CNTs to form porous and conductive network.In addition,N-doped MXene and CNTs can provide strong chemical immobilization for polysulfides and effectively entrap them within the porous microspheres.Above-mentioned merits enable N-Ti3C2@CNT microspheres to be ideal sulfur host.When used in lithium–sulfur(Li–S)battery,the N-Ti3C2@CNT microspheres/S cathode delivers initial specific capacity of 927 mAh g−1 at 1 C and retains high capacity of 775 mAh g−1 after 1000 cycles with extremely low fading rate(FR)of 0.016%per cycle.Furthermore,the cathode still shows high cycling stability at high C-rate of 4 C(capacity of 647 mAh g−1 after 650 cycles,FR 0.027%)and high sulfur loading of 3 and 6 mg cm−2 for Li–S batteries.
文摘Micro-encapsulation of shrimp oil using the mixture of whey protein concentrate(WPC)and sodium caseinate(SC)(1:1,w/w)as a wall material was carried out.The impact of core/wall material ratios(1:2 and 1:4,w/w)and homogenizing pressures(13.79 and 27.58 MPa)on characteristics and stability of emulsion was investigated.The size of emulsion oil droplets decreased with increasing homogenizing pressure(P<0.05)but was not influenced by core/wall material ratio(P>0.05).During the extended storage,particle size,flocculation factor(Ff)and coalescence index(Ci)of all emulsions sharply increased,especially in emulsions prepared at 13.79 MPa with a core/wall material ratio of 1:2(P<0.05).After spray drying,micro-encapsulated shrimp oil(MSO)prepared at 13.79 MPa with a core/wall material ratio of 1:2 had the larger size than others(P<0.05).MSO prepared using a core/wall material ratio of 1:4 with homogenizing pressure of 27.58 MPa exhibited higher encapsulation efficiency(EE)(51.3%–52.8%)than others.Thus,both core/wall material ratio and homogenizing pressure directly affected micro-encapsulation of shrimp oil.
基金financially supported by the Department of Education of Liaoning Province of China
文摘Micro-nano structured Li Fe（1-x）MnxPO4/C（0≤x≤0.05）cathodes were prepared by spray drying,followed by calcination at 700°C.The spherical Li Fe（1-x）MnxPO4/C（0≤x≤0.05）particles with the size of 0.5 to5.0μm are composed of lots of nanoparticles of 20 to 30 nm,and have the well-developed interconnected pore structure.In contrast,when Mn doping content is 3 mol%（x=0.03）,the Li Fe（0.97）Mn（0.03）PO4/C demonstrates maximum specific surface area of 31.30 m^2/g,more uniform pore size and relatively better electrochemical performance.The initial discharge capacities are 161.59,157.04 and 153.13 m Ah/g at a discharge rate of 0.2,0.5 and 1 C,respectively.Meanwhile,the discharge capacity retentions are～100%after 120 cycles.The improved electrochemical performance should be attributed to higher specific surface,smaller polarization voltage,and a high Li~＋diffusion rate due to the micro-nano porous structure and lattice expansion produced by Mn doping.
文摘Nanocrystalline Na2ZrO3 was demonstrated as a promising acceptor for CO2 capture at elevated temperatures. The mechanism of nanocrystalline Na2ZrO3 formation from the soft-chemistry route is elucidated by varying precursors, preparation methods, and calciantion temperatures, combining detailed characterizations by X-ray diffraction （XRD） and scanning electron microscope （SEM） at different steps in the process. The results revealed that the drying method such as spraying drying and simple evaporation-drying did not influence the final product prop- erties. However both Na and Zr precursors had remarkable influences on the Na2ZrO3 formation. The solid reaction of Na intermediate and nanocrystalline ZrO2 in the calcination was identified as the key step for the Na2ZrO3 formation, where the formation of molten phase Na intermediate was found to be crucial to facilitate the solid reaction. We provided principles for rational design of the chemistry for the Na2ZrO3 formation where the formation of Na intermediate with low melting points is essential. Pure nanocrystalline Na2ZrO3 can be synthesized from a mixture containing sodium nitrate and zirconoxy citrate via the formation of NaNO3 with low melting point. However, it is not possible to form pure nanocrystalline Na2ZrO3 at relatively low temperatures from the mixtures of NaAc/ZrO（NO3）2 or NaCA/ZrOC12 due to the formation of Na2CO3 and NaC1 with high melting points.
