期刊文献+
共找到11篇文章
< 1 >
每页显示 20 50 100
An efficient fluorination of β-ketosulfones promoted by a room-temperature ionic liquid at ambient conditions under ultrasound irradiation using Selectfluor^(TM) F-TEDA-BF_4 被引量:3
1
作者 Mohammad Reza Poor Heravi 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第12期1399-1402,共4页
The fluorination reaction involving a β-ketosulfones by Selectfluor^TM was efficiently promoted by the ionic liquid, [Hbim]BF4 (IL) as a reaction medium with methanol as co-solvent at room temperature under ultraso... The fluorination reaction involving a β-ketosulfones by Selectfluor^TM was efficiently promoted by the ionic liquid, [Hbim]BF4 (IL) as a reaction medium with methanol as co-solvent at room temperature under ultrasonic irradiation to afford the corresponding mono and difluoro-β-ketosulfones in excellent yields. The advantages of this method include among others the use of a recyclable, non-volatile ionic liquid, which promotes this protocol under room temperature without the requirement of any added catalyst under ultrasonic irradiation. 展开更多
关键词 FLUORINATION ultrasound irradiation β-Ketosulfones Selectfluor^TM Ionic liquids(ILs)
下载PDF
A Novel Access to Organostannane Compounds under Ultrasound Irradiation
2
作者 Li Zeng PENG Tian Sheng MEI +1 位作者 Tao ZHANG Yu Lin LI 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第4期341-342,共2页
A simple and efficient procedure has been developed for the synthesis of organostannane compounds by one-pot reaction of stannane halides, magnesium turnings and organic halides in the presence of 1, 2-dibromoethane u... A simple and efficient procedure has been developed for the synthesis of organostannane compounds by one-pot reaction of stannane halides, magnesium turnings and organic halides in the presence of 1, 2-dibromoethane under ultrasound irradiation for the first time. 展开更多
关键词 Organostannane one-pot reaction ultrasound irradiation.
下载PDF
Novel Access to Organostannane Compounds under Ultrasound Irradiation
3
作者 赵志全 孙彬 +2 位作者 彭立增 李瀛 李裕林 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2004年第11期1382-1383,共2页
A simple and efficient procedure has been developed for the synthesis of organostannane compounds by one-pot reaction of stannane halides, magnesium turnings and organic halides in the presence of 1,2-dibromoethane un... A simple and efficient procedure has been developed for the synthesis of organostannane compounds by one-pot reaction of stannane halides, magnesium turnings and organic halides in the presence of 1,2-dibromoethane under ultrasound irradiation. 展开更多
关键词 organostannane one-pot reaction ultrasound irradiation
原文传递
Effective preparation of 5,5'-(arylmethylene)bis(4-hydroxythiazole-2(3H)-one) in an aqueous fluoroalcohol solvent system under ultrasound irradiation at room temperature
4
作者 Mohammad Reza Poor Heravi Mozhdeh Naghilou 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第5期1039-1043,共5页
A green and convenient approach for the synthesis of a series of 5,5'-(arylmethylene)bis(4-hydroxythiazole-2(3H)-one) by the reaction of aryl aldehydes,monochloroacetic acid and ammonium thiocyanate in water/tr... A green and convenient approach for the synthesis of a series of 5,5'-(arylmethylene)bis(4-hydroxythiazole-2(3H)-one) by the reaction of aryl aldehydes,monochloroacetic acid and ammonium thiocyanate in water/trifluoroethanol(TFE)(1:1) under ultrasound irradiation at room temperature is described.This method provides several advantages such as environmental friendliness,shorter time,excellent yields,and simple work-up procedure. 展开更多
关键词 Multicomponent reaction Hydrogen bonding Trifluoroethanol(TFE) ultrasound irradiation Bis(4-hydroxythiazole-2(3H)-one)
原文传递
Estimation of temperature elevation generated by ultrasonic irradiation in biological tissues using the thermal wave method 被引量:1
5
作者 刘晓宙 朱忆 +1 位作者 张飞 龚秀芬 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第2期302-307,共6页
In most previous models,simulation of the temperature generation in tissue is based on the Pennes bio-heat transfer equation,which implies an instantaneous thermal energy deposition in the medium.Due to the long therm... In most previous models,simulation of the temperature generation in tissue is based on the Pennes bio-heat transfer equation,which implies an instantaneous thermal energy deposition in the medium.Due to the long thermal relaxation time τ(20 s-30 s) in biological tissues,the actual temperature elevation during clinical treatments could be different from the value predicted by the Pennes bioheat equation.The thermal wave model of bio-heat transfer(TWMBT) defines a thermal relaxation time to describe the tissue heating from ultrasound exposure.In this paper,COMSOL Multiphysics 3.5a,a finite element method software package,is used to simulate the temperature response in tissues based on Pennes and TWMBT equations.We further discuss different factors in the bio-heat transfer model on the influence of the temperature rising and it is found that the temperature response in tissue under ultrasound exposure is a rising process with a declining rate.The thermal relaxation time inhibits the temperature elevation at the beginning of ultrasonic heating.Besides,thermal relaxation in TWMBT leads to lower temperature estimation than that based on Pennes equation during the same period of time.The blood flow carrying heat dominates most to the decline of temperature rising rate and the influence increases with temperature rising.On the contrary,heat diffusion,which can be described by thermal conductivity,has little effect on the temperature rising. 展开更多
关键词 thermal wave model of bioheat transfer temperature elevation ultrasound irradiation
下载PDF
Effects Of Ultrasound On Voltammetric Measurements At An Ag Cylinder Electrode
6
作者 Xiao Gang ZHANG Wan Yong ZHOU +1 位作者 Chao Ying GENG Xi XIA (Institute of Applied Chemistry, Xinjiang University, Wulumqi 830046) 《Chinese Chemical Letters》 SCIE CAS CSCD 1998年第7期663-666,共4页
In this paper,the voltammetric behaviours of Ag cylinder electrode in 1 mol/dm(3) KOH solution have been investigated in the presence of ultrasound irradiation. The results based on the CV, EIS and polarization measur... In this paper,the voltammetric behaviours of Ag cylinder electrode in 1 mol/dm(3) KOH solution have been investigated in the presence of ultrasound irradiation. The results based on the CV, EIS and polarization measurements showed that ultrasound could enhance the mass transport, inhibit the oxygen evolution and increase the exchange current. 展开更多
关键词 SONOELECTROCHEMISTRY ultrasound irradiation Ag electrode voltammetric behaviours
全文增补中
Studies on the Neodymium-induced Pinacol Coupling of Aromatic Aldehydes and Ketones in Aqueous Media 被引量:1
7
作者 Yan Jiang BIAN Hai Long WANG +1 位作者 Bo WU Ji Tai LI 《Chinese Chemical Letters》 SCIE CAS CSCD 2006年第5期591-594,共4页
Pinacol coupling reactions of aromatic aldehydes and ketones were carded out using Nd-36% HOAc-CH2Cl2 system with stirring at r. t. for 4 h (in 14-70% yield). The reactions in the same system gave pinacols in 10-93%... Pinacol coupling reactions of aromatic aldehydes and ketones were carded out using Nd-36% HOAc-CH2Cl2 system with stirring at r. t. for 4 h (in 14-70% yield). The reactions in the same system gave pinacols in 10-93% yield under ultrasound irradiation at r. t. for 2 h. 展开更多
关键词 PINACOL synthesis NEODYMIUM ultrasound irradiation.
下载PDF
A New Drug Delivery System──Ciprofloxacine/TricalciumPhosphate Delivery Capsule (CTDC) and Its In Vitro DrugRelease Pattern
8
作者 吴宏斌 郑启新 +2 位作者 杜靖远 阎玉华 刘畅 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 1997年第3期160-164,共5页
A new drug delivery system (DDS), ciprofloxacine/tricalcium phosphate delivery capsule (CTDC) was developed by loading a broad-spectrum antibiotic ciprofloxacine into the central cylindrical cavity of tricalcium phosp... A new drug delivery system (DDS), ciprofloxacine/tricalcium phosphate delivery capsule (CTDC) was developed by loading a broad-spectrum antibiotic ciprofloxacine into the central cylindrical cavity of tricalcium phosphate capsule. The new system showed good biocompatibility and could degrade gradually in our preliminary studies. In vitro study showed that CTDC could mantain highlevel and long-term releae of ciprofloxacine and that ultrasonic irradiation within the range of physical therapy could increase the drug release amount from CTDC(P<0. 02), and might become a new technique to achieve the control of drug release from DDS. 展开更多
关键词 drug delivery system CERAMIC elution study ultrasound irradiation
下载PDF
Ultrasound-assisted Cinnamaldehyde Hydrogenation to Cinnamyl Alcohol at Atmospheric Pressure over Ru-B Amorphous Catalyst
9
作者 李辉 马春景 李和兴 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2006年第5期613-619,共7页
The ultrafine Ru-B amorphous alloy catalyst was prepared by chemical reduction with KBH4. During liquidphase hydrogenation of cinnamaldehyde at atmospheric pressure, the Ru-B catalyst prepared exhibited excellent sele... The ultrafine Ru-B amorphous alloy catalyst was prepared by chemical reduction with KBH4. During liquidphase hydrogenation of cinnamaldehyde at atmospheric pressure, the Ru-B catalyst prepared exhibited excellent selectivity to cinnamyl alcohol. When the hydrogenation was performed with ultrasonic irradiation, the reaction rate could be greatly enhanced while the selectivity to cinnamyl alcohol remained almost unchanged. The hydrogenation rate was increased with the increase of either the ultrasonic frequency or the irradiation time. According to various characterizations, such as XRD, XPS, TEM, BET and ICP, the effect of ultrasonic irradiation on the structural and electronic characteristics of Ru-B catalyst was studied briefly. Meanwhile, the promotion effect of ultrasonication on the catalytic performance was also discussed based on the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol. 展开更多
关键词 Ru-B amorphous alloy ultrasound irradiation CINNAMALDEHYDE cinnamyl alcohol catalytic hydrogenation
原文传递
Ultrasound-triggered dual-drug release from poly(lactic-co-glycolic acid)/mesoporous silica nanoparticles electrospun composite fibers
10
作者 Botao Song Chengtie Wu Jiang Chang 《Regenerative Biomaterials》 SCIE 2015年第4期229-237,共9页
The aim of this study was to achieve on-demand controlled drug release from the dual-drug-loadedpoly(lactic-co-glycolic acid)/mesoporous silica nanoparticles electrospun composite fibers by theapplication of ultrasoun... The aim of this study was to achieve on-demand controlled drug release from the dual-drug-loadedpoly(lactic-co-glycolic acid)/mesoporous silica nanoparticles electrospun composite fibers by theapplication of ultrasound irradiation.Two drugs were loaded in different part of the composite fibrousmaterials,and it was found that ultrasound as an external stimulus was able to control releaseof drugs due to both its thermal effect and non-thermal effect.With the selective irradiation ofultrasound,the drug carrier enabled to realize controlled release,and because of different locationin fibers and sensitivity of two different kinds of drugs to ultrasound irradiation,the release rate oftwo drugs was different.These results indicated that ultrasound irradiation was a facile method torealize the on-demand controlled release of two drugs from the electrospun fibers. 展开更多
关键词 ELECTROSPINNING mesoporous silica dual drug release ultrasound irradiation
原文传递
Sonochemical synthesis and photoluminescence properties of rare-earth phosphate core/shell nanorods 被引量:2
11
作者 余文媛 李冠涞 周利 《Journal of Rare Earths》 SCIE EI CAS CSCD 2010年第2期171-175,共5页
Rare earth phosphate core/shell nanostructures were synthesized via facile ultrasound irradiation method.XRD and TEM were em-ployed to characterize the structure and morphology properties.The photoluminescence(PL) pro... Rare earth phosphate core/shell nanostructures were synthesized via facile ultrasound irradiation method.XRD and TEM were em-ployed to characterize the structure and morphology properties.The photoluminescence(PL) properties of TbPO4/CePO4 and CePO4/TbPO4 core/shell nanorods were studied to explore the energy transfers from Ce3+ to Tb3+.In the Ce0.9Tb0.1PO4/LaPO4 core/shell nanorods,the PL intensity of Ce0.9Tb0.1PO4 nanorods was enhanced when the LaPO4 shells were coated. 展开更多
关键词 core/shell nanorods PHOTOLUMINESCENCE energy transfer ultrasound irradiation rare earths
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部