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2003 Volume 14 Issue 8
2003, 14(8): 771-772
Abstract:
A novel type of palladium-catalyzed cascade cyclization-coupling reaction has been found. Reaction of N, N-diallylbenzoylamide 1 with benzyl halides 2 afforded the corresponding dihydropyrroles 3 in moderate to excellent yields.
A novel type of palladium-catalyzed cascade cyclization-coupling reaction has been found. Reaction of N, N-diallylbenzoylamide 1 with benzyl halides 2 afforded the corresponding dihydropyrroles 3 in moderate to excellent yields.
2003, 14(8): 773-775
Abstract:
The azides were reduced to the corresponding amines by two new metal/Lewis acid systems in water or in aqueous EtOH in yields ranging from 80%-95%. The reaction rates were faster in water than in aqueous EtOH in most cases. All 16 azides with different functional groups were well reduced to the corresponding amines in excellent yields and reaction rates.
The azides were reduced to the corresponding amines by two new metal/Lewis acid systems in water or in aqueous EtOH in yields ranging from 80%-95%. The reaction rates were faster in water than in aqueous EtOH in most cases. All 16 azides with different functional groups were well reduced to the corresponding amines in excellent yields and reaction rates.
2003, 14(8): 776-778
Abstract:
A convenient synthetic route was developed for the synthesis of the novel glycolipids:1, 2-di-O-acyl-3-O-(2'-acylamide-2'-deoxy-α-D-glucopyranosyl)-sn-glycerols. 10 new compounds of glycolipids with different acyl groups were obtained.
A convenient synthetic route was developed for the synthesis of the novel glycolipids:1, 2-di-O-acyl-3-O-(2'-acylamide-2'-deoxy-α-D-glucopyranosyl)-sn-glycerols. 10 new compounds of glycolipids with different acyl groups were obtained.
2003, 14(8): 779-782
Abstract:
Dinucleotide (TpAZT) phosphoramidates were synthesized by Todd reaction of dinucleoside H-phosphonates and amino acid methyl esters, and their diastereomers (Rp and Sp) were separated by crystallization, and the results showed that natural and cheap methyl esters of alanine and phenylalanine can be used for large-scale synthesis of dinucleotide analogs.
Dinucleotide (TpAZT) phosphoramidates were synthesized by Todd reaction of dinucleoside H-phosphonates and amino acid methyl esters, and their diastereomers (Rp and Sp) were separated by crystallization, and the results showed that natural and cheap methyl esters of alanine and phenylalanine can be used for large-scale synthesis of dinucleotide analogs.
2003, 14(8): 783-785
Abstract:
Using microwave irradiation, perylene was obtained from 3,4,9,10-perylenetetracar-boxylic dianhydride with copper powder in boiling quinoline. With the same method, 1,12-benzoperylene was synthesized from 1,12-benzoperylene-1',2'-dicarboxylic anhydride, and coronene was prepared from coronene-1,2-dicarboxylic anhydride with good yield. Through Dields-Alder reaction, 1,12-benzoperylene-1',2'-dicarboxylic anhydride and coronene-1,2-dicarboxylic anhydride were also prepared using microwave irradiation.
Using microwave irradiation, perylene was obtained from 3,4,9,10-perylenetetracar-boxylic dianhydride with copper powder in boiling quinoline. With the same method, 1,12-benzoperylene was synthesized from 1,12-benzoperylene-1',2'-dicarboxylic anhydride, and coronene was prepared from coronene-1,2-dicarboxylic anhydride with good yield. Through Dields-Alder reaction, 1,12-benzoperylene-1',2'-dicarboxylic anhydride and coronene-1,2-dicarboxylic anhydride were also prepared using microwave irradiation.
2003, 14(8): 786-789
Abstract:
N-pivot lariat ethers with picrylamino group as a chromophore (1, 2 and 3) have been prepared by reaction of N-(4-aminoaryl)monoaza crown ethers with picryl chrolide, and the selective coloration of 1, 2 and 3 for alkali metal salts and amines has been studied by UV-Vis spectra.
N-pivot lariat ethers with picrylamino group as a chromophore (1, 2 and 3) have been prepared by reaction of N-(4-aminoaryl)monoaza crown ethers with picryl chrolide, and the selective coloration of 1, 2 and 3 for alkali metal salts and amines has been studied by UV-Vis spectra.
2003, 14(8): 790-793
Abstract:
A series of novel 3-alkylthio-4-arylideneamino-5-(2-furyl)-1,2,4-triazole derivatives were synthesized. Their chemical structures were confirmed with elemental analysis and spectral data. Endothelin(ET) receptor competitive binding assay showed that some compounds exhibited high selective as potent ET-1 receptor antagonist.
A series of novel 3-alkylthio-4-arylideneamino-5-(2-furyl)-1,2,4-triazole derivatives were synthesized. Their chemical structures were confirmed with elemental analysis and spectral data. Endothelin(ET) receptor competitive binding assay showed that some compounds exhibited high selective as potent ET-1 receptor antagonist.
2003, 14(8): 794-796
Abstract:
Uracil molecular imprinted membrane was prepared by phase inversion technique with[P(AN-co-MAA)] copolymer. SEM photograph shows that the resultant membrane has a typical ultrafiltration structure with Water Volume Flux of 3.7×10-5m3/m2·s, and uracil substrate permeation experiment shows that the resultant membrane can bind uracil into its structure, and shows a binding equilibrium.
Uracil molecular imprinted membrane was prepared by phase inversion technique with[P(AN-co-MAA)] copolymer. SEM photograph shows that the resultant membrane has a typical ultrafiltration structure with Water Volume Flux of 3.7×10-5m3/m2·s, and uracil substrate permeation experiment shows that the resultant membrane can bind uracil into its structure, and shows a binding equilibrium.
2003, 14(8): 797-799
Abstract:
Several polystyrene-supported selenides and selenoxide have been prepared firstly. These novel reagents were treated with LDA to produce selenium stabilized carbanions, which reacted with aldehydes and alkyl halides, followed by selenoxide syn-elimination and [2,3] sigmatropic rearrangement respectively to give Z-allylic alcohols stereoselectively.
Several polystyrene-supported selenides and selenoxide have been prepared firstly. These novel reagents were treated with LDA to produce selenium stabilized carbanions, which reacted with aldehydes and alkyl halides, followed by selenoxide syn-elimination and [2,3] sigmatropic rearrangement respectively to give Z-allylic alcohols stereoselectively.
2003, 14(8): 800-803
Abstract:
Regioselective addition reactions of silyl enolates to α,β-unsaturated aldehyde and its acetal catalyzed by MgI2 etherate give aldol adducts (1, 2-addition) preferentially over Michael adducts (1, 4-addition). This unique regioselectivity is distinctly different with other Lewis acidic promoters and may be attributed to the high oxyphilicity of IMg+.
Regioselective addition reactions of silyl enolates to α,β-unsaturated aldehyde and its acetal catalyzed by MgI2 etherate give aldol adducts (1, 2-addition) preferentially over Michael adducts (1, 4-addition). This unique regioselectivity is distinctly different with other Lewis acidic promoters and may be attributed to the high oxyphilicity of IMg+.
2003, 14(8): 804-806
Abstract:
14-Deacetoxy-13-oxo sinenxan A (1) was converted to 9α-hydroxy-13-oxo-2α, 5α, 10β-triacetoxy-4(20),11-taxadiene (2) and 10β-hydroxy-13-oxo-2α,5α,9α-triacetoxy-4(20), 11-taxadiene (3) by Ginkgo cell suspension cultures in 45% and 15% yields, respectively.
14-Deacetoxy-13-oxo sinenxan A (1) was converted to 9α-hydroxy-13-oxo-2α, 5α, 10β-triacetoxy-4(20),11-taxadiene (2) and 10β-hydroxy-13-oxo-2α,5α,9α-triacetoxy-4(20), 11-taxadiene (3) by Ginkgo cell suspension cultures in 45% and 15% yields, respectively.
2003, 14(8): 807-809
Abstract:
A new poly brominated dibenzylphenol named as rhodomevoidin was isolated from Rhodomela confervoides. Its structrue was elucidated as 3-bromo-4,5-bis (2,3-dibromo-4,5-dihydroxybenzyl)pyrocatechol by spectroscopic methods including IR, HRFABMS, 1D and 2D NMR techniques.
A new poly brominated dibenzylphenol named as rhodomevoidin was isolated from Rhodomela confervoides. Its structrue was elucidated as 3-bromo-4,5-bis (2,3-dibromo-4,5-dihydroxybenzyl)pyrocatechol by spectroscopic methods including IR, HRFABMS, 1D and 2D NMR techniques.
2003, 14(8): 810-813
Abstract:
Two new benzyl dihydroflavones phelligrins A and B were isolated from the fruit body of Phellinus igniarius. Their structrues were identified as 5,7,4'-trihydroxy-6-O-hydroxybenzyl-dihydroflavone and 5,7,4'-trihydroxy-8-O-hydroxybenzyldihydroflavone, respectively, by means of spectral methods.
Two new benzyl dihydroflavones phelligrins A and B were isolated from the fruit body of Phellinus igniarius. Their structrues were identified as 5,7,4'-trihydroxy-6-O-hydroxybenzyl-dihydroflavone and 5,7,4'-trihydroxy-8-O-hydroxybenzyldihydroflavone, respectively, by means of spectral methods.
2003, 14(8): 814-817
Abstract:
Two new tartrate derivative glucosides, coelovirin C (1) and D (2), were isolated from rhizomes of Coeloglossum viride (L.) Hartm. var. bracteatum (Willd.) Richter (Orchidaceae). Their structures were elucidated as (2R, 3S)-2-β-D-glucopyranosyl-2-isobutyltartrate-1-(4-β-D-glucopyranosyloxybenzyl) ester 1 and (2R, 3S)-2-β-D-glucopyranosyl-2-isobutyltartrate-4-(4-β-D-glucopyranosyloxybenzyl) ester 2 by means of chemical and spectroscopic methods.
Two new tartrate derivative glucosides, coelovirin C (1) and D (2), were isolated from rhizomes of Coeloglossum viride (L.) Hartm. var. bracteatum (Willd.) Richter (Orchidaceae). Their structures were elucidated as (2R, 3S)-2-β-D-glucopyranosyl-2-isobutyltartrate-1-(4-β-D-glucopyranosyloxybenzyl) ester 1 and (2R, 3S)-2-β-D-glucopyranosyl-2-isobutyltartrate-4-(4-β-D-glucopyranosyloxybenzyl) ester 2 by means of chemical and spectroscopic methods.
2003, 14(8): 818-819
Abstract:
A new sesquiterpene and a new norsesquiterpene were isolated from the whole plant of Cacalia deltophylla (Maxim) Mattf. Their structures were elucidated as deltocacalone (1) and deltonorcacalol (2) by spectroscopic methods including 2D NMR.
A new sesquiterpene and a new norsesquiterpene were isolated from the whole plant of Cacalia deltophylla (Maxim) Mattf. Their structures were elucidated as deltocacalone (1) and deltonorcacalol (2) by spectroscopic methods including 2D NMR.
2003, 14(8): 820-823
Abstract:
A novel bonded stationary phase, bidenate amide bonded stationary phase (BABSP), was prepared by reacting YWG silica gel firstly with 3-aminopropyltrimethoxysilane, then with diacid chloride. Hydrophobicity, selectivity, and especially silanophilic activity of BABSP were evaluated. The stationary phase exhibited good column efficiency and peak shape for separation of some basic solutes.
A novel bonded stationary phase, bidenate amide bonded stationary phase (BABSP), was prepared by reacting YWG silica gel firstly with 3-aminopropyltrimethoxysilane, then with diacid chloride. Hydrophobicity, selectivity, and especially silanophilic activity of BABSP were evaluated. The stationary phase exhibited good column efficiency and peak shape for separation of some basic solutes.
2003, 14(8): 824-827
Abstract:
The renaturation and purification of recombinant human proinsulin (rh-proinsulin) expressed in E. Coli with the unit of simultaneous renaturation and purification of protein (USRPP) in semi-preparative scale was studied. The result shows that rh-proinsulin extracted with 8.0 mol/L urea can be renatured and purified simultaneously in 45 minutes with the USRPP (10×50 mm ID). The purity of rh-proinsulin was found to be more than 90% and the mass recovery to be more than 80%. The renaturation effect of rh-proinsulin with the USRPP was tested by enzyme cleavage for obtaining insulin. In addition, the result was further confirmed with RPLC, SDS-PAGE electrophoresis, and MALDI-TOF, respectively.
The renaturation and purification of recombinant human proinsulin (rh-proinsulin) expressed in E. Coli with the unit of simultaneous renaturation and purification of protein (USRPP) in semi-preparative scale was studied. The result shows that rh-proinsulin extracted with 8.0 mol/L urea can be renatured and purified simultaneously in 45 minutes with the USRPP (10×50 mm ID). The purity of rh-proinsulin was found to be more than 90% and the mass recovery to be more than 80%. The renaturation effect of rh-proinsulin with the USRPP was tested by enzyme cleavage for obtaining insulin. In addition, the result was further confirmed with RPLC, SDS-PAGE electrophoresis, and MALDI-TOF, respectively.
2003, 14(8): 828-831
Abstract:
Oxidative refolding of the denatured/reduced lysozyme was investigated by using weak-cation exchange chromatography (WCX). The stationary phase of WCX binds to the reduced lysozyme and prevented it from forming intermolecular aggregates. At the same time urea and ammonium sulfate were added to the mobile phase to increase the elution strength for lysozyme. Ammonium sulfate can more stabilize the native protein than a common eluting agent, sodium chloride. Refolding of lysozyme by using this WCX is successfully. It was simply carried out to obtain a completely and correctly refolding of the denatured lysozyme at high concentration of 20.0 mg/mL.
Oxidative refolding of the denatured/reduced lysozyme was investigated by using weak-cation exchange chromatography (WCX). The stationary phase of WCX binds to the reduced lysozyme and prevented it from forming intermolecular aggregates. At the same time urea and ammonium sulfate were added to the mobile phase to increase the elution strength for lysozyme. Ammonium sulfate can more stabilize the native protein than a common eluting agent, sodium chloride. Refolding of lysozyme by using this WCX is successfully. It was simply carried out to obtain a completely and correctly refolding of the denatured lysozyme at high concentration of 20.0 mg/mL.
2003, 14(8): 832-835
Abstract:
Functionalized liposomes were prepared by mixing the biotin in the lipid vesicle suspensions. The experiments through immersing streptavidin deposited mica into the biotin modified liposome solution testify the specifically biological binding interaction and extend the function of liposomes as a biosensor or drug carrier.
Functionalized liposomes were prepared by mixing the biotin in the lipid vesicle suspensions. The experiments through immersing streptavidin deposited mica into the biotin modified liposome solution testify the specifically biological binding interaction and extend the function of liposomes as a biosensor or drug carrier.
2003, 14(8): 836-839
Abstract:
The inhibition of ligninase by hydrogen peroxide in the presence of cationic surfactant CTAB was studied by kinetic spectrophotometric technique. Results showed that addition of CTAB enhanced the inhibition by H2O2, but it did not alter the inhibition pattern and the inhibition constant changed little with the concentration of CTAB. Modification of the enzymic protein by the surfactant monomer may be responsible for the above mentioned results.
The inhibition of ligninase by hydrogen peroxide in the presence of cationic surfactant CTAB was studied by kinetic spectrophotometric technique. Results showed that addition of CTAB enhanced the inhibition by H2O2, but it did not alter the inhibition pattern and the inhibition constant changed little with the concentration of CTAB. Modification of the enzymic protein by the surfactant monomer may be responsible for the above mentioned results.
2003, 14(8): 840-843
Abstract:
A series of diorganotin (Ⅳ) derivatives of R2SnL2 (R=Me, Et, n-Bu, ph or Cl; L=L1 or L2) and their corresponding mixed-ligand complexes R2Sn(L1)(L2) have been prepared and the structure of trans-Me2Sn(L2)2 was characterized by FT-IR, 1H, 13C and 119Sn NMR spectroscopies, MS, elemental analysis, melting points and X-ray diffraction. The structure-activity relationships were discussed.
A series of diorganotin (Ⅳ) derivatives of R2SnL2 (R=Me, Et, n-Bu, ph or Cl; L=L1 or L2) and their corresponding mixed-ligand complexes R2Sn(L1)(L2) have been prepared and the structure of trans-Me2Sn(L2)2 was characterized by FT-IR, 1H, 13C and 119Sn NMR spectroscopies, MS, elemental analysis, melting points and X-ray diffraction. The structure-activity relationships were discussed.
2003, 14(8): 844-847
Abstract:
Using bis(2-ethylhexyl) sodium sulfosuccinate (AOT) as surfactant, two amphiphilic porphyrin terminated with imidazole were studied in AOT/iso-octane/water reverse micelles, intending to mimic the relationship between microenvironments in organism and the amphiphilic properties of porphyrins for photodynamic therapy drugs.
Using bis(2-ethylhexyl) sodium sulfosuccinate (AOT) as surfactant, two amphiphilic porphyrin terminated with imidazole were studied in AOT/iso-octane/water reverse micelles, intending to mimic the relationship between microenvironments in organism and the amphiphilic properties of porphyrins for photodynamic therapy drugs.
2003, 14(8): 848-851
Abstract:
A novel bridged β-CD dimer in which two β-cyclodextrins were linked by a naphthalene at positions 2 and 7 has been synthesized.1H and 13CNMR measurements showed that a large change in the conformation of the dimer occurred in aqueous solution. The dimer interacted with methyl and ethyl orange to form stable inclusion complexes via "induced fit" mechanism.
A novel bridged β-CD dimer in which two β-cyclodextrins were linked by a naphthalene at positions 2 and 7 has been synthesized.1H and 13CNMR measurements showed that a large change in the conformation of the dimer occurred in aqueous solution. The dimer interacted with methyl and ethyl orange to form stable inclusion complexes via "induced fit" mechanism.
2003, 14(8): 851-855
Abstract:
Deposition of inorganic-organic nano-hybrid ultrathin films onto mesoporous silicate materials has been proven possible by using layer-by-layer assembly method. In combination with sol-gel method, titania, subsequently dye molecules (or polymer) were successfully fabricated onto the inner wall of SBA-15. Their structures were preliminarily characterized by FTIR and solid-state UV-Vis spectroscopy, thermal analysis, and BET surface area measurements, respectively.
Deposition of inorganic-organic nano-hybrid ultrathin films onto mesoporous silicate materials has been proven possible by using layer-by-layer assembly method. In combination with sol-gel method, titania, subsequently dye molecules (or polymer) were successfully fabricated onto the inner wall of SBA-15. Their structures were preliminarily characterized by FTIR and solid-state UV-Vis spectroscopy, thermal analysis, and BET surface area measurements, respectively.
2003, 14(8): 856-859
Abstract:
The crystal of 2,4,6-tristyryl-s-triazine (TSTA) has been prepared and its crystal structure been determined to be in the polar non-centrosymmetric space group Cmc21. The molecular structure of TSTA is characterized by the slightly curved planar configuration and the octupolar C3v molecular symmetry. As expected, TSTA crystal shows a quite novel nonlinear optical (NLO) property with its powder second harmonic generating (SHG) intensity of 1.8 times as that of urea. It also shows excellent transparency (with the peak position of 322 nm in absorption spectrum) and good thermal stability (with the melting point of 225-229℃).
The crystal of 2,4,6-tristyryl-s-triazine (TSTA) has been prepared and its crystal structure been determined to be in the polar non-centrosymmetric space group Cmc21. The molecular structure of TSTA is characterized by the slightly curved planar configuration and the octupolar C3v molecular symmetry. As expected, TSTA crystal shows a quite novel nonlinear optical (NLO) property with its powder second harmonic generating (SHG) intensity of 1.8 times as that of urea. It also shows excellent transparency (with the peak position of 322 nm in absorption spectrum) and good thermal stability (with the melting point of 225-229℃).
2003, 14(8): 860-862
Abstract:
Two new isomers of HPS3 system, HP(S)S2 and HSSPS, are predicted by means of B3LYP method with 6-311++G(3df,3pd) basis set. The two isomers can isomerize into thermodynamically the most stable species HSPS2, which have been experimentally identified, with relatively higher reaction barriers. In view of their higher thermodynamical and kinetic stability and the experimental observation for HP(O)O2 and HOOPO in previous study, we can reasonably believe that the two species can be spectrosymmetrically characterized in future experiments.
Two new isomers of HPS3 system, HP(S)S2 and HSSPS, are predicted by means of B3LYP method with 6-311++G(3df,3pd) basis set. The two isomers can isomerize into thermodynamically the most stable species HSPS2, which have been experimentally identified, with relatively higher reaction barriers. In view of their higher thermodynamical and kinetic stability and the experimental observation for HP(O)O2 and HOOPO in previous study, we can reasonably believe that the two species can be spectrosymmetrically characterized in future experiments.
2003, 14(8): 863-865
Abstract:
The terpolymer latex of methyl methacrylate (MMA)/butyl acrylate (BA)/dimethyl aminoethyl methacrylate (DMAEMA) with diameter of less than 100 nm was prepared by seeding semi-continuous emulsion copolymerization using APS (ammonium persulfate)/TMEDA (N,N,N, N-tetramethylethylenediamine) as the redox initiators and SDS (sodium dodecylsulfate) and OP (P-octylpolyethylene glycol phenylether) as co-emulsifiers. The factors that influenced the process stability of the copolymerization and the particle size of the latex were investigated. The addition of aqueous ammonia as coagulation inhibitor provided better process stability of the copoly-merization. The addition of acetic acid as the acidification agent caused a remarkable reduction of the latex particle size.
The terpolymer latex of methyl methacrylate (MMA)/butyl acrylate (BA)/dimethyl aminoethyl methacrylate (DMAEMA) with diameter of less than 100 nm was prepared by seeding semi-continuous emulsion copolymerization using APS (ammonium persulfate)/TMEDA (N,N,N, N-tetramethylethylenediamine) as the redox initiators and SDS (sodium dodecylsulfate) and OP (P-octylpolyethylene glycol phenylether) as co-emulsifiers. The factors that influenced the process stability of the copolymerization and the particle size of the latex were investigated. The addition of aqueous ammonia as coagulation inhibitor provided better process stability of the copoly-merization. The addition of acetic acid as the acidification agent caused a remarkable reduction of the latex particle size.
2003, 14(8): 866-869
Abstract:
Gold nanoparticles were synthesized through the reduction of tetrachlorauric acid (HAuCl4) by NaBH4, with polyethyleneimine(PEI) as stabilizer. The nanoparticles were characterized by UV-vis spectroscopy and atomic force microscopy(AFM).
Gold nanoparticles were synthesized through the reduction of tetrachlorauric acid (HAuCl4) by NaBH4, with polyethyleneimine(PEI) as stabilizer. The nanoparticles were characterized by UV-vis spectroscopy and atomic force microscopy(AFM).
2003, 14(8): 870-873
Abstract:
KL molecular sieves with different framework compositions were secondarily synthesized by substituting Si for Al with a solution of (NH4)2SiF6. The internal tetrahedron symmetric stretch frequency, at ~770 cm-1, is linear with the molar fraction of Al (XAl=Al/(Si+Al)) in the framework of KL samples:XAl=-7.309×10-3 (υ770-760)+0.3242.
KL molecular sieves with different framework compositions were secondarily synthesized by substituting Si for Al with a solution of (NH4)2SiF6. The internal tetrahedron symmetric stretch frequency, at ~770 cm-1, is linear with the molar fraction of Al (XAl=Al/(Si+Al)) in the framework of KL samples:XAl=-7.309×10-3 (υ770-760)+0.3242.
2003, 14(8): 874-876
Abstract:
A continuous and dense NaA zeolite membrane was synthesized by microwave heating method while employing a multi-step seeding LTA zeolite with the average size of 120 nm. The gas H2/N2 mixture separating results indicated that the mixture selectivity increased with increasing of synthesis times. In addition, selectivity of the three-step synthesis was higher than the value(3.74) expected from Kundsen diffusion.
A continuous and dense NaA zeolite membrane was synthesized by microwave heating method while employing a multi-step seeding LTA zeolite with the average size of 120 nm. The gas H2/N2 mixture separating results indicated that the mixture selectivity increased with increasing of synthesis times. In addition, selectivity of the three-step synthesis was higher than the value(3.74) expected from Kundsen diffusion.
2003, 14(8): 877-880
Abstract:
TiO2 nanoparticles were synthesized by using micro-reactors. The shape and size of the nanoparticles produced from the original micro-reactors and the five times recycled micro-reactors mother liquor were investigated on transmission electron microscopy (TEM) by using the original sample, freeze prepared sample, and dyeing treated sample, respectively. UV-VIS spectrometry was used to study the growth process of TiO2 nanoparticles in main reactors. The results showed that micro-reactors with nanometer magnitude had spherical or oval structures, and could restore to their original structure after they were destroyed. The products prepared in the original micro-reactors were similar to that in the micro-reactors recycled for many times, suggesting that the micro-reactors had memory function.
TiO2 nanoparticles were synthesized by using micro-reactors. The shape and size of the nanoparticles produced from the original micro-reactors and the five times recycled micro-reactors mother liquor were investigated on transmission electron microscopy (TEM) by using the original sample, freeze prepared sample, and dyeing treated sample, respectively. UV-VIS spectrometry was used to study the growth process of TiO2 nanoparticles in main reactors. The results showed that micro-reactors with nanometer magnitude had spherical or oval structures, and could restore to their original structure after they were destroyed. The products prepared in the original micro-reactors were similar to that in the micro-reactors recycled for many times, suggesting that the micro-reactors had memory function.
