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Layer-by-layer fabrication of montmorillonite coating immobilizing Cu_(2)O nanoparticles for continuously catalyzing glycerol to dihydroxyacetone

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Chinese Journal of Chemical Engineering 2024年第4期68卷 263-275页

作者： Kejin Li Jiahui Liu Dajian Li Xiaolan Chen Chunhui Zhou Research Group for Advanced Materials&Sustainable Catalysis(AMSC) State Key Laboratory Breeding Base of Green Chemistry-Synthesis TechnologyCollege of Chemical EngineeringZhejiang University of TechnologyHangzhou 310032China Qing Yang Institute for Industrial Minerals Qingyang 242804China Engineering Research Center of Non-metallic Minerals of Zhejiang Province Zhejiang Institute of Geology and Mineral ResourcesHangzhou 310007China

Microreactors are increasingly used for green and safe chemical processes owing to their benefits of superior mass and heat transfer,increased yield,safety,and simplicity of control.However,immobilizing catalysts in microreactors remains challenging.In this investigation,a technique for creating Cu_(2)O/montmorillonite catalyst coating,using electrostatic attraction for layer-by-layer self-assembly,was proposed.The montmorillonite film's morphology and thickness could be efficiently regulated by adjusting the degree of exfoliation and surface charge of montmorillonite,alongside layer-by-layer coating times.The Cu_(2)O nanoparticles were immobilized using the flow deposition approach.The resulting Cu_(2)O@montmorillonite-film-coated capillary microreactor successfully transformed glycerol into dihydroxyacetone.The conversion of glycerol and product selectivity could be controlled by adjusting the molar ratio of reactants,temperature,residence time,and Cu_(2)O loading.The maximum glycerol conversion observed was 47.6%,with a 27%selectivity toward dihydroxyacetone.The study presents a technique for immobilizing montmorillonite-based catalyst coatings in capillary tubing,which can serve as a foundation for the future application of microreactors in glycerol conversion.

关键词： Microreactor Coating Montmorillonite glycerol Cu_(2)O

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Photoinduced superlubricity on TiO_(2) surfaces

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Friction 2024年第3期12卷 428-438页

作者： Ke HAN Liran MA Yu TIAN Jianbin LUO State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China Received:16 September 2022/Revised:28 October 2022/Accepted:27 December 2022The author(s)2022.

Superlubricity control is of great interest in both industry and scientific research,and several methods have been proposed to achieve this goal.In this work,ultraviolet(UV)light was introduced into titanium dioxide(TiO_(2))and silicon nitride(Si_(3)N_(4))tribosystems to accomplish photoinduced superlubricity.The friction coefficients(COFs)between Si_(3)N_(4) balls and TiO_(2) plates in the mixtures of sulfuric acid(H^(2)SO_(4))solution and glycerol solution were obviously reduced,and the system entered the superlubricity region(COFglycerol by UV illumination was the key to the photoinduced superlubricity in this system.These findings showed one method for achieving superlubricity by introducing a light field that could be further applied to special working conditions.

关键词： light control friction superlubricity glycerol titanium dioxide(TiO_(2))

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Millisecond dynamics of colloidal suspension studied by X-ray photon correlation spectroscopy at the Shanghai Synchrotron Radiation Facility

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Nuclear Science and Techniques 2024年第1期35卷 1-9页

作者： Chen-Hui Cui Zi-Mu Zhou Lin-Feng Wei Song-Lin Li Feng Tian Xiu-Hong Li Zhi Guo Yi-Hui Xu Huai-Dong Jiang Ren-Zhong Tai Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Center for Transformative Science ShanghaiTech UniversityShanghai 201210China

X-ray photon correlation spectroscopy(XPCS)has emerged as a powerful tool for probing the nanoscale dynamics of soft condensed matter and strongly correlated materials owing to its high spatial resolution and penetration capabilities.This technique requires high brilliance and beam coherence,which are not directly available at modern synchrotron beamlines in China.To facilitate future XPCS experiments,we modified the optical setup of the newly commissioned BL10U1 USAXS beamline at the Shanghai Synchrotron Radiation Facility(SSRF).Subsequently,we performed XPCS measurements on silica suspensions in glycerol,which were opaque owing to their high concentrations.Images were collected using a high frame rate area detector.A comprehensive analysis was performed,yielding correlation functions and several key dynamic parameters.All the results were consistent with the theory of Brownian motion and demonstrated the feasibility of XPCS at SSRF.Finally,by carefully optimizing the setup and analyzing the algorithms,we achieved a time resolution of 2 ms,which enabled the characterization of millisecond dynamics in opaque systems.

关键词： XPCS SSRF Silica suspension glycerol Brownian motion Millisecond dynamics

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Multiphysics of multifunctional nanofluids based on different oxides nanoparticles and glycerol fluid

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Particuology 2023年第5期76卷 46-62页

作者： R.J.Sengwa Mukul Saraswat Dielectric Research Laboratory Department of PhysicsJai Narain Vyas UniversityJodhpur342005India

Nanofluid(NF)materials consisting of glycerol(Gly)and different inorganic nano oxides(TiO_(2),ZnO,Al_(2)O_(3),and SiO_(2) for the oxides concentration of 0.01 wt%to the weight of Gly base fluid)were prepared by a two-step method through ultrasonic cavitation process.These nanofluids were investigated by employing an X-ray diffractometer(XRD),ultraviolet-visible(UV-Vis)spectrophotometer,20 Hz to 1 MHz frequency range dielectric relaxation spectroscopy(DRS),ultrasonic interferometer,and rotational viscometer.The multiphysics of these nanofluids includes structural and optical properties,dielectric permittivity,electrical conductivity,conductivity relaxation,ultrasound velocity,adiabatic compress-ibility,acoustic impedance,viscosity,density,thermal conductivity,and viscoacoustic relaxation were characterized.The XRD patterns identified monodispersed and stable suspensions of these different characteristic nanoparticles in the hydrogen-bonded 3D supramolecular structure of ultra-high viscous glycerol fluid which were supported by their UV-Vis absorbance analyses.The energy band gap values of the TiO_(2)and ZnO containing nanofluids were found primarily ruled by the characteristic optical prop-erties of these oxides nanomaterials.The complex dielectric and various electrical functions studied at 25℃revealed that the suspension of different oxide nanoparticles in the glycerol fluid increased the static permittivity whereas reduced the direct current electrical conductivity which showed strong conductivity relaxation process dependence.The rheological measurements of the formulated nanofluids were performed over a shear rate range of 0.4-40 s^(-1)at temperatures of 25-55℃.The linear rela-tionship between shear rate and shear stress and also the shear rate-independent viscosity revealed the Newtonian behaviour of these nanofluids.The shear viscosity non-linearly decreased with the increase of temperature and exhibited the Arrhenius behaviour for all different oxides containing Gly-based nanofluids.The acoustic parameters

关键词： glycerol Nano oxides Nanofluids Optical properties Dielectric properties Thermophysical parameters

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Melanin,DNA replication,and autophagy affect appressorium development in Setosphaeria turcica by regulating glycerol accumulation and metabolism

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Journal of Integrative Agriculture 2022年第3期21卷 762-773页

作者： GUO Xiao-yue LIU Ning LIU Bing-hui ZHOU Li-hong CAO Zhi-yan HAN Jian-min DONG Jin-gao State Key Laboratory of North China Crop Improvement and Regulation/Key Laboratory of Hebei Province for Plant Physiology and Molecular Pathology/Mycotoxin and Molecular Plant Pathology Laboratory Hebei Agricultural UniversityBaoding 071001P.R.China

Setosphaeria turcica(syn.Exserohilum turcicum)is the pathogenic fungus of maize(Zea mays)that causes northern leaf blight,which is a major maize disease worldwide.Melanized appressoria are highly specialized infection structures formed by germinated conidia of S.turcica that infect maize leaves.The appressorium penetrates the plant cuticle by generating turgor,and glycerol is known to be the main source of the turgor.Here,the infection position penetrated by the appressorium on maize leaves was investigated,most of the germinated conidia entered the leaf interior by directly penetrating the epidermal cells,and the appressorium structure was necessary for the infection,whether it occurred through epidermal cells or stomata.Then,to investigate the effects of key factors in the development of the appressorium,we studied the effects of three inhibitors,including a melanin inhibitor(tricyclazole,TCZ),a DNA replication inhibitor(hydroxyurea,HU),and an autophagy inhibitor(3-methyladenine,3-MA),on appressorium turgor and glycerol content.As results,appressorium turgor pressure and glycerol concentration in the appressorium reached their highest levels at the mature stage of the appressorium under the control and inhibitor treatments.The three inhibitors had the greatest effects on appressorium turgor pressure at this stage.Glycogen and liposomes are the main substances producing glycerol.It was also found inhibitors affected the distribution of glycogen and liposomes,which were detected in the conidia,the germ tube,and the appressorium during appressorium development.This study provides profound insight into the relationship between appressorium turgor pressure and glycerol content,which was affected by the synthesis of melanin,DNA replication,and autophagy in the developing appressorium during a S.turcica infection.

关键词： melanin DNA replication autophagy appressorium development Setosphaeria turcica glycerol

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Highly efficient fermentation of glycerol and 1,3-propanediol using a novel starch as feedstock

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Food Bioscience 2022年第2期46卷 200-208页

作者： You Yang Ying Chen Yanling Jin Jing Liu Xiang Qin Wenjun Liu Ling Guo Department of Pediatrics Children Hematological Oncology and Birth Defects LaboratoryThe Affiliated Hospital of Southwest Medical UniversitySichuan Clinical Research Center for Birth DefectsLuzhouSichuan646000China CAS Key Laboratory of Environmental and Applied Microbiology Environmental Microbiology Key Laboratory of Sichuan ProvinceChengdu Institute of BiologyChinese Academy of SciencesChengduSichuan610041China National Engineering Research Center for Non-Food Biorefinery Guangxi Academy of SciencesNanningGuangxi530007China

As a potential cost-effective feedstock for highly efficient fermentation of glycerol and its downstream product 1,3-propanediol(1,3-PD),duckweed starch was characterized and used for glycerol fermentation,for the first time,in this study.Genes involved in glycerol biosynthesis(gpd1 and gpp2)were overexpressed in Escherichia coli,and genes involved in glycerol catabolism(glpK and gldA)were disrupted,which led to significantly decreased residual sugar levels and dramatically increased glycerol production.The maximum glycerol concentration in fed-batch fermentation reached 102.72 g L^(-1) at 28 h,and the glycerol productivity was 3.67 g L^(-1) h^(-1),which,to our knowledge,is the highest productivity thus far reported.Subsequently,glycerol broth was fermented into 1,3-PD by Klebsiella pneumoniae.The concentration,conversion rate and productivity of 1,3-PD reached 35.54 g L^(-1),40.28%and 0.89 g L^(-1) h^(-1),respectively,without optimization.In summary,the duckweed starch-to-glycerol-to-1,3-PD process is feasible and shows potential for improving glycerol industry competitiveness.

关键词： Duckweed starch glycerol 1,3-Propanediol Fed-batch fermentation Biosynthesis

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Heteropoly Ionic Liquid Functionalized MOF-Fe:Synthesis,Characterization,and Catalytic Application in Selective Acetalization of glycerol to Solketal as a Fuel Additive at Room Temperature,Solvent-Free Conditions

Precision Chemistry

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Precision Chemistry 2023年第8期1卷 485-496页

作者： Abdulaziz Abdullah Qasem Ali Zeba N.Siddiqui Green Chemistry Laboratory Organic Chemistry DivisionDepartment of ChemistryAligarh Muslim UniversityAligarhUttar Pradesh 202002India

In this work,we have reported the synthesis of a series of heterogeneous catalysts,viz.,[HMIm]_(3)[PW_(12)O_(40)]@MOF-Fe,[HMIm]_(3)[PMo_(12)O_(40)]@MOF-Fe,and[HMIm]_(4)[SiW_(12)O_(40)]@MOFFe,by a simple impregnation method.The catalysts were characterized by several techniques,such as FTIR,EDX,XRD,SEM,elemental mapping,and TGA.Among these materials,[HMIm]_(3)[PW_(12)O_(40)]@MOF-Fe had more acidic sites(confirmed by potentiometric titration)and high stability around 598℃(confirmed by TGA).The catalytic prospect of the materials was examined through selective acetalization of glycerol to solketal as a fuel additive under solvent-free and room-temperature conditions.[HMIm]_(3)[PW_(12)O_(40)]@MOF-Fe exhibited the highest catalytic activity among the three catalysts in terms of glycerol conversion(100%),solketal selectivity(100%),and solketal yield(100%).A recyclability study of[HMIm]_(3)[PW_(12)O_(40)]@MOF-Fe showed that the material could be reused for up to 7 cycles with insignificant loss in its catalytic performance.

关键词： heteropoly ionic liquids [HMIm]_(3)[PW_(12)O_(40)]@MOF-Fe heterogeneous catalysis MOF-Fe selective acetalization glycerol solketal

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glycerol use in dairy diets:A systemic review

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Animal Nutrition 2019年第3期5卷 209-216页

作者： Ahmed E.Kholif Dairy Science Department National Research Centre

There is an increasing interest in the production of biodiesel as bio-renewable fuel source,with numerous biofuel byproducts becoming available.The annual productions of biodiesel and crude glycerol were 34.5 and 3.8 billion liters,respectively,in 2016 and that of biodiesel is expected to reach 41 billion liters in 2019.glycerol is a sugar alcohol without a color or odor,but with a sweet taste and high solubility index in water.Experiments support the use of glycerol at low levels ranging from 5% to 8% of the diet dry matter as a transition cow therapy.Administration of glycerol increases serum glucose and decreases ketone bodies.glycerol is very rapidly fermented in the rumen to propionate and butyrate,at the expense of acetate,resulting in a decreased milk fat.Because glycerol is highly fermented in the rumen,it requires an adaptation period at the beginning of feeding.Administration of glycerol in the diet of lactating animals was paralleled with a decreased or an unaffected feed intake in most experiments.Improved ruminal environment to enhance nutrient digestibility was observed in many experiments;however,others observed reduced digestion of dietary fiber with feeding glycerol.Enhanced,lowered,or unaffected milk production and composition were observed with the administration of glycerol in lactating animal diets;however,in most cases,glycerol decreased milk fat content.The inconsistencies between results of experiments are due to the level and the purity of glycerol,diets,production stage of the animals,and other factors.Therefore,further research should be conducted to establish the efficacy of different levels,purity and administration periods of glycerol,and production stage of dairy animals fed glycerol-based or supplemented diets.

关键词： Biodiesel byproducts Feed utilization glycerol Milk production and composition Ruminal fermentation

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glycerol valorization through production of di-glyceryl butyl ether with sulfonic acid functionalized KIT-6 catalyst

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Carbon Resources Conversion 2020年第1期3卷 182-189页

作者： Thi Tuong Vi Tran Maytinee Obpirompoo Suwadee Kongparakul Surachai Karnjanakom Prasert Reubroycharoen Guoqing Guan Narong Chanlek Chanatip Samart Department of Chemistry Faculty of Science and TechnologyThammasat UniversityPathumthani 12120Thailand Thammasat University Research Unit in Bioenergy and Catalysis(BCRU) Thammasat UniversityPathumtani 12120Thailand Department of Chemistry Faculty of ScienceRangsit UniversityPathumthani 12000Thailand Department of Chemical Technology Faculty of ScienceChulalongkorn UniversityBangkok 10330Thailand Institute of Regional Innovation Hirosaki UniversityAomori 030-0813Japan Synchrotron Light Research Institute(SLRI) 111 University AvenueMuang DistrictNakhon Ratchasima 30000Thailand

In this work,the etherification of glycerol with n-butanol catalyzed by sulfonic acid functionalized on KIT-6 mesoporous silica(SO_(3)H-KIT-6)was investigated for the production of valuable fuel additives.The SO_(3)H-KIT-6 catalyst was synthesized by co-condensation with different molar ratios of tetraethoxysilane and 3-mercaptopropyl(methyl)di-methoxy silane.The etherification reaction was systematically examined to determine the optimal reaction temperature,reaction time,catalyst loading,and glycerol to n-butanol ratio under autogenous pressure.The maximum glycerol conversion and di-glyceryl n-butyl ether(di-GNBE)selectivity were 59.09 and 51.50%,respectively,when the SO_(3)H-KIT-6 catalyst with the highest acidity was applied.Interestingly,the presence of a methyl group on the catalyst surface prevented glycerol adsorption during the reaction process,leading to the inhibition of undesired product formation.The SO_(3)H-KIT-6 catalyst could be reused up to three times,with only a 13%decrease in glycerol conversion being found.Moreover,the superior performance of the SO_(3)H-KIT-6 catalyst for di-GNBE production was also demonstrated compared with conventional solid acid catalysts including HZSM-5,H-beta zeolite,Amberlyst-35,and Amberlyst-36.

关键词： Etherification glycerol SO_(3)H-KIT-6 catalyst Valuable fuel additive di-GNBEs

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Effect of low-density lipoproteins, spermatozoa concentration and glycerol on functional and motility parameters of bull spermatozoa during storage at 4℃

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Asian Journal of Andrology 2011年第2期13卷 281-286页

作者： Oscar Vera-Munoz Lamia Amirat-Briand Djemil Bencharif Marc Anton Serge Desherces Eric Shmitt Chantal Thorin Daniel Tainturier Laboratory of Biotechnology and Pathology of Reproduction ONIRIS Nantes-Atlantic College of Veterinary Medicine and Food Science 44307 Nantes France Facultad deCiencias Veterinarias Instituto de Reproduccion Animal Abraham Hemndez Prado Universidad Centra de Venezuela Maracay 2101 Aragua Venezuela Groupe Physico-chimie des Emulsions Laboratoire d＇Etude des Interactions des Molecules Alimentaires Institut National de la Recherche Agronomique 44316 Nantes Cedex 3 France MVTechnologies I＇Aigle 61300 France

An extender has been developed with low-density lipoproteins （LDLs） that eliminates the microbial risks associated with the use of whole egg yolk. The objective of this study was to assess the effects of substituting egg yolk with LDLs for use as an extender in sperm preservation at 4 ℃, as well as on spermatozoa motility, plasma membrane and acrosome integrity, at two different concentrations （80×10^6 and 240× 10^6 sperm per ml） for 8 days and to evaluate glycerol toxicity in both extenders. A total of 12 ejaculates were collected from three bulls. Spermatozoa motility was examined using computer-assisted semen analysis. Plasma membrane integrity was determined using the hypo-osmotic swelling test and acrosome integrity with the fluorescein isothiocyanate-Pisum sativum agglutinin test. The semen was subsequently divided into four aliquots and diluted with Tris-egg yolk-glycerol （TEG）, Tris-egg yolk without glycerol （TE）, LDL with glycerol （LDL＋） and LDL without glycerol （LDL-）, at 80×10^6 and 240 ×10^6sperm per ml. This study showed that the LDL＋ and LDL- extenders were more effective at preserving spermatozoa motility, plasma membrane integrity and acrosome integrity than TEG and TE （P〈0.05） during 8 days of incubation. After 3 days of incubation, a toxicity of glycerol was observed in TEG, whereas no significant difference was observed between LDL＋ and LDL-. We can therefore conclude that the LDL extender can be used to refrigerate semen at 4 ~C instead of TEG and TE at 80×10^6and 240×10^6 sperm per ml for elite bulls. This finding can be used to define a policy for the storage of high-quality bull semen.

关键词： bull semen glycerol low-density lipoproteins membrane integrity motility refrigeration

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