A kind of photosensitive ultra-thin film was fabricated from diazoresin (DR) and various calixarenes by using theself-assembly technique. Under UV irradiation both the ionic- and hydrogen bonds between the layers of t...A kind of photosensitive ultra-thin film was fabricated from diazoresin (DR) and various calixarenes by using theself-assembly technique. Under UV irradiation both the ionic- and hydrogen bonds between the layers of the film will convert into covalent bonds. As a result, the stability of the film toward polar solvents increases dramatically.展开更多
Ultrathin films of diazoresin （DR）/single-walled carbon nanotube （SWNT） were fabricated on thioglycollic acid （TGA） decorated gold （Au） electrodes by the self-assembly method combined with the photocrosslinkin...Ultrathin films of diazoresin （DR）/single-walled carbon nanotube （SWNT） were fabricated on thioglycollic acid （TGA） decorated gold （Au） electrodes by the self-assembly method combined with the photocrosslinking technique. The electrochemical behavior of dopamine （DA） at the DR/SWNT modified electrodes was studied using the cyclic voltammetry （CV） and differential pulse voltammetry （DPV） methods. Under the optimal conditions, a linear CV response to DA concentration from 1 p, mol/L to 40 μmol/L was observed, and the detection limit of DA was 2.1 ×10-3 μmol/L via the DPV method in the presence of 10μmol/L of uric acid （UA） or 2.5 × 10-3 μmol/L via the DPV method in the presence of 10 μmol/L of ascorbic acid （AA）. Moreover, the modified electrodes exhibited good reproducibility and sensitivity, demonstratinz its feasibilitv for analytical ourooses.展开更多
The layer-by-layer assembly of graphene oxide and diazoresin is carried out via the electrostatic and hydrogen bond interactions on planar substrates and colloidal templates.The successful planar and spherical growth ...The layer-by-layer assembly of graphene oxide and diazoresin is carried out via the electrostatic and hydrogen bond interactions on planar substrates and colloidal templates.The successful planar and spherical growth of multilayer could be investigated by UV-vis spectrophotometry and scanning electron microscopy,respectively.Subsequent UV irradiation or heating would convert the ionic bonds and hydrogen bonds to covalent bands,which significantly improves the stability of the multilayer composite against solvent etching.For the cross-linked core-shell composites,the template cores could be removed by dissolution and hollow microspheres are obtained.展开更多
Poly(4\|vinyl phenol) (PVPh) was synthesized from anisaldehyde via Perkin Doebner and decarboxyl reactions to form 4 methoxy styrene.It was then polymerized by free radical polymerization following dealkylation to for...Poly(4\|vinyl phenol) (PVPh) was synthesized from anisaldehyde via Perkin Doebner and decarboxyl reactions to form 4 methoxy styrene.It was then polymerized by free radical polymerization following dealkylation to form PVPh.A kind of stable multilayer utra thin film was successfully fabricated via self assembly technique from PVPh and diazoresin (DR) followed by UV irradiation.The driving force of self assembly was confirmed to be the hydrogen bonding attraction from diazonium group(—N + 2)of DR and phenolic hydroxy group(—Ph—OH)of PVPh.The film becomes very stable towards polar solvents after UV irradiation and it is believed that the H bonds between the layers of the film converts to covalent bonds following the decomposition of —N + 2 groups when the multilayer film underwent UV irradiation.展开更多
Carboxy containing colloidal particles were prepared from emulsion copolymerization of styrene-acrylic acid-butyl acrylate.The particle size and the size distribution were determined on mica by atomic force microscopy...Carboxy containing colloidal particles were prepared from emulsion copolymerization of styrene-acrylic acid-butyl acrylate.The particle size and the size distribution were determined on mica by atomic force microscopy after evaporating the water of the diluted emulsion.A sandwich structure covalently attached between the layers and particles has been fabricated from nitro-substituted diazoresin (NDR) and carboxy containing colloidal particles by the self-assembly combining UV irradiation technique.The ionic bonds between the layers and particles convert to covalent bonds under UV irradiation and the stable sandwich structure was achieved successfully.The assembly process,the stability of the film toward DMF etching and the morphology of the films were also reported.展开更多
On the substrate of modified quartz, two kinds of self assembled ultra thin films were fabricated through layer by layer electrostatic deposition with diazoresin′s sulfonate(DRS) as the polyanion, and chitosan(CS) as...On the substrate of modified quartz, two kinds of self assembled ultra thin films were fabricated through layer by layer electrostatic deposition with diazoresin′s sulfonate(DRS) as the polyanion, and chitosan(CS) as the polycation. The self assembly process was monitored by UV Vis spectra and confirmed that the layer by layer deposition takes place regularly. The films obtained both from DRS, CS(CS/DRS film) and from DR, DRS, CS(DR/DRS/CS/DRS film) were photo sensitive. Under irradiation of ultraviolet light, the stability of the films towards polar solvents increases significantly. The kinetic study shows that the rate of the photodecomposition reaction of DR/DRS/CS/DRS films is higher than that of CS/DRS films and doesnt show the first order reaction for both films.展开更多
The photo and thermo decomposition kinetics of diphenylamine diazoresin in water?ethanol water and methanol water has been investigated by spectrophotometry. The velocity of photo decomposition is higher than that of ...The photo and thermo decomposition kinetics of diphenylamine diazoresin in water?ethanol water and methanol water has been investigated by spectrophotometry. The velocity of photo decomposition is higher than that of thermo decomposition in the same solvent.展开更多
A novel multiplayer film was assembled from poly[(4 carboxyphenyl)acetylene](PCPA) and diazoresin(DR) in aqueous solution via electrostatic attraction. Under UV irradiation, following the decomposition of diazonium gr...A novel multiplayer film was assembled from poly[(4 carboxyphenyl)acetylene](PCPA) and diazoresin(DR) in aqueous solution via electrostatic attraction. Under UV irradiation, following the decomposition of diazonium group between the adjacent interfaces of the multiplayers, the ionic bonds of the self assembly film convert to covalent bonds and the film becomes very stable toward electrolyte solutions. Thus the photoelectric conversion property of poly[(4 carboxyphenyl)acetylene] containing film can be measured in conventional three electrode photoelectrochemical cell, and 0.5 mol/L KCl solution can be used as the supporting electrolyte. The photocurrent spectroscopy responses coincide with the absorption spectrum of the irradiated self assembly film, which indicates that the irradiated DR/PCPA film is responsible for the photocurrent generation.展开更多
基金This work was supported by the National Natural Science Foundation of China (No. 50173002 and 20274002).
文摘A kind of photosensitive ultra-thin film was fabricated from diazoresin (DR) and various calixarenes by using theself-assembly technique. Under UV irradiation both the ionic- and hydrogen bonds between the layers of the film will convert into covalent bonds. As a result, the stability of the film toward polar solvents increases dramatically.
基金supported by the National Key Basic Research Development Program of China(973 Special Preliminary Study Plan,No.2012CB722705)the Natural Science Foundation of China(Nos.21375069 and 21344005)+2 种基金the Fok Ying Tong Education Foundation(No.131045)the Scientific Research Foundation for the Returned Overseas Chinese Scholars of State Education Ministry(No.20111568)the Science and Technology Program of Qingdao(No.1314159jch)
文摘Ultrathin films of diazoresin （DR）/single-walled carbon nanotube （SWNT） were fabricated on thioglycollic acid （TGA） decorated gold （Au） electrodes by the self-assembly method combined with the photocrosslinking technique. The electrochemical behavior of dopamine （DA） at the DR/SWNT modified electrodes was studied using the cyclic voltammetry （CV） and differential pulse voltammetry （DPV） methods. Under the optimal conditions, a linear CV response to DA concentration from 1 p, mol/L to 40 μmol/L was observed, and the detection limit of DA was 2.1 ×10-3 μmol/L via the DPV method in the presence of 10μmol/L of uric acid （UA） or 2.5 × 10-3 μmol/L via the DPV method in the presence of 10 μmol/L of ascorbic acid （AA）. Moreover, the modified electrodes exhibited good reproducibility and sensitivity, demonstratinz its feasibilitv for analytical ourooses.
基金supported by the Natural Science Foundation of China(Nos.21173266 and 21473250)the Fundamental Research Funds for the Central Universitiesthe Research Funds of Renmin University of China(No.11XNJ021)
文摘The layer-by-layer assembly of graphene oxide and diazoresin is carried out via the electrostatic and hydrogen bond interactions on planar substrates and colloidal templates.The successful planar and spherical growth of multilayer could be investigated by UV-vis spectrophotometry and scanning electron microscopy,respectively.Subsequent UV irradiation or heating would convert the ionic bonds and hydrogen bonds to covalent bands,which significantly improves the stability of the multilayer composite against solvent etching.For the cross-linked core-shell composites,the template cores could be removed by dissolution and hollow microspheres are obtained.
文摘Poly(4\|vinyl phenol) (PVPh) was synthesized from anisaldehyde via Perkin Doebner and decarboxyl reactions to form 4 methoxy styrene.It was then polymerized by free radical polymerization following dealkylation to form PVPh.A kind of stable multilayer utra thin film was successfully fabricated via self assembly technique from PVPh and diazoresin (DR) followed by UV irradiation.The driving force of self assembly was confirmed to be the hydrogen bonding attraction from diazonium group(—N + 2)of DR and phenolic hydroxy group(—Ph—OH)of PVPh.The film becomes very stable towards polar solvents after UV irradiation and it is believed that the H bonds between the layers of the film converts to covalent bonds following the decomposition of —N + 2 groups when the multilayer film underwent UV irradiation.
文摘Carboxy containing colloidal particles were prepared from emulsion copolymerization of styrene-acrylic acid-butyl acrylate.The particle size and the size distribution were determined on mica by atomic force microscopy after evaporating the water of the diluted emulsion.A sandwich structure covalently attached between the layers and particles has been fabricated from nitro-substituted diazoresin (NDR) and carboxy containing colloidal particles by the self-assembly combining UV irradiation technique.The ionic bonds between the layers and particles convert to covalent bonds under UV irradiation and the stable sandwich structure was achieved successfully.The assembly process,the stability of the film toward DMF etching and the morphology of the films were also reported.
文摘On the substrate of modified quartz, two kinds of self assembled ultra thin films were fabricated through layer by layer electrostatic deposition with diazoresin′s sulfonate(DRS) as the polyanion, and chitosan(CS) as the polycation. The self assembly process was monitored by UV Vis spectra and confirmed that the layer by layer deposition takes place regularly. The films obtained both from DRS, CS(CS/DRS film) and from DR, DRS, CS(DR/DRS/CS/DRS film) were photo sensitive. Under irradiation of ultraviolet light, the stability of the films towards polar solvents increases significantly. The kinetic study shows that the rate of the photodecomposition reaction of DR/DRS/CS/DRS films is higher than that of CS/DRS films and doesnt show the first order reaction for both films.
文摘The photo and thermo decomposition kinetics of diphenylamine diazoresin in water?ethanol water and methanol water has been investigated by spectrophotometry. The velocity of photo decomposition is higher than that of thermo decomposition in the same solvent.
文摘A novel multiplayer film was assembled from poly[(4 carboxyphenyl)acetylene](PCPA) and diazoresin(DR) in aqueous solution via electrostatic attraction. Under UV irradiation, following the decomposition of diazonium group between the adjacent interfaces of the multiplayers, the ionic bonds of the self assembly film convert to covalent bonds and the film becomes very stable toward electrolyte solutions. Thus the photoelectric conversion property of poly[(4 carboxyphenyl)acetylene] containing film can be measured in conventional three electrode photoelectrochemical cell, and 0.5 mol/L KCl solution can be used as the supporting electrolyte. The photocurrent spectroscopy responses coincide with the absorption spectrum of the irradiated self assembly film, which indicates that the irradiated DR/PCPA film is responsible for the photocurrent generation.
