49 results about "Silver cluster" patented technology

Process to obtain antibacterial surfaces by silver deposition in the form of firmly bonded small particles and to the antibacterial substances obtained by aforementioned treatments. Silver deposition is obtained by surface impregnation of natural or synthetic material in an alcoholic solution with silver salt and, later, by their exposure to UV-rays until metal silver clusters form as a result of silver ions reduction on the material surface. The invention relates to the obtained antibacterial substances.

The simple preparation of the antibacterial material makes the whole process easier both for required time and for costs: the needed devices are just a UV lamp and an Ultrasound bath.

Enhanced oil recovery becomes increasingly important in satisfying the growing demand for fossil fuel. The efficiency of secondary recovery processes like water flooding is however largely influenced by the rock characteristics, fluid characteristics, chemistry and physics. For development of the full potential of secondary oil recovery, it remains a challenge to obtain sufficient knowledge about the reservoir conditions. The present invention provides a novel water-dispersed, nano-sensor composition based on. InP/ZnS quantum dots (“QDs”) and atomic silver clusters, which exhibit a bright visible fluorescence combined with dedicated sensor functionalities. The QD and silver nano-sensors were tested in simulated reservoir conditions to determine their selected functionality to these reservoir conditions. The developed nano-sensors showed improved sensor functionalities towards pH, temperature, and subterranean reservoir rock, such, as clay or limestone.

The invention provides a fluorescent biological sensor for detecting uracil-DNA glycosylase (UDG). The fluorescent biological sensor comprises an annular template, a hairpin probe, a fluorescent probe, dNTP, phi 29 DNA polymerase and endonuclease IV. The biological sensor disclosed by the invention has the advantages of good specificity, high flexibility, moderate reaction condition and quick reaction speed; by means of silver cluster fluorescent detection, the biological sensor has the advantages of convenience in operation, short detection period, easiness in carrying, low technological cost, suitability for an industrial inexpensive requirement; a preparation method has the advantages of simpleness, stable performance and good repeatability.

The invention discloses application of a sulfydryl silver cluster coordination polymer in organic solvent detection, and belongs to the cross field of nanometer materials and coordination chemistry. The polymer is a silver/sulfur cluster-based porous coordination polymer with the 12-core silver/sulfur cluster as the node and bridged with a bi-toothed organic ligand. The chemical formula of the compound is [(Ag12(SBu(i)t(/i))8(CF3COO)4(bpy)4)](i)n(/i). The material has amphiphilic ducts and has high capacity for adsorbing small solvent molecules. The solvent molecules in the ducts interact with the ligand to affect the excited state energy level of the material, so that the fluorescent performance of the material changes in different polar solvents. Excellent linear relation exists between the solvent polarity and the fluorescence maximum emission peak wavelength of the material. Therefore, organic solvents can be recognized and detected according to fluorescence spectra. The silver/sulfur cluster-based porous coordination polymer has the advantages of being free of invasion and high in sensitivity and safety and has good application prospects in organic solvent recognition and detection.

The invention provides a tetranuclear silver exotic metal cluster compound. A chemical molecular formula of the tetranuclear silver exotic metal cluster compound is [(dppf) 2Ag4 (C=CtBu) 2 (CH3OH)2] (BF4) 2.2CH3OH. The invention further provides a method for preparing the tetranuclear silver exotic metal cluster compound. The tetranuclear silver exotic metal cluster compound and the method have the advantages that the method for preparing the tetranuclear silver exotic metal cluster compound is based on the excellent stability of 1, 1'-bis (diphenylphosphine) ferrocene ligands and strong coordinating capacity of silver and phosphorus atoms, and accordingly ultimate products are high in stability and can be possibly potentially applied to the photoelectric field; raw materials for the tetranuclear silver exotic metal cluster compound prepared by the aid of the method are simple and are easily available, the method can be easily and feasibly implemented and is low in cost, good in repeatability and high in yield, processes are simple, the products are stable, certain bases can be provided for constructing exotic metal cluster compounds and chemically modifying silver cluster compounds by preparation of the tetranuclear silver exotic metal cluster compound, and the like.

The invention discloses a method for preparing a high-stability polymer coated a nano silver cluster, and is characterized by comprising the following steps of: (1) synthesizing a silane-Ag complex, namely dissolving 0.0370 to 0.0986 gram of silver nitrate in 10 to 30 milliliters of absolute methanol, adding 200 to 600 mu litters of silane, and stirring in a dark place for 1 to 4 hours; (2) synthesizing a polymer-modified nano silver cluster, namely dissolving 0.0363 to 0.0968 gram of polymer in 1 to 20 milliliters of water, adding solution formed by the step (1), stirring for 1 to 30 minutes; and (3) adding 10 to 100 mu liters of absolute formaldehyde, stirring in a dark place for 3 to 6 hours, obtaining a yellow solution, settling and filtering to obtain the polymer-modified nano silver cluster. The polymer-modified nano silver cluster synthesized by the method has the advantages of low price, stable performance, no toxicity and the like. The cluster has very high practical value and has a great prospect in environment analysis, biochemical analysis, food safety and other fields.

The invention discloses a method for preparing a nano-composite by controllable deposition of silver atoms on the surface of nano-oxide. The nano-composite is composed of transition metal or rare-earth oxide and silver cluster which is deposited and grows on the surface of transition metal or rare-earth oxide. The method is realized through an organic amine improved silver mirror reaction. That is to say, silver atoms generated by reducing a silver amine complex with aldehyde are controllably deposited on the surface of nano-oxide. By using organic amine as a complexing agent, the silver mirror reaction can be carried out in a mild and controllable way. The method comprises the following specific steps: dispersing surfactant-wrapped nano-oxide into an organic solvent to obtain a system A; dissolving silver salt and organic amine in an organic solvent to obtain a silver amine complex solution B; and adding the solution B into the system A, adding an excessive amount of aldehyde and keeping for 1-30 h, precipitating a product with ethanol, centrifuging and washing to obtain the nano-composite. By changing addition amount of the silver source and effectively controlling reaction time, size of silver species in the nano-composite is controlled within 0.3-3 nm.

The invention discloses a chiral nano-silver cluster material with a high stability, a strong luminescence and a high quantum yield, and belongs to the field of intersection of coordination chemistryand nano-materials. The enantiomer of the chiral nano-silver cluster adopts a chiral ligand (S/R)-4-phenylthiazolidine-2-thione (PL/PD) as a protective ligand, and the chiral silver nano-cluster material with the high yield and excellent luminescent properties is synthesized by a simple room temperature volatilization one-pot process. The chemical formula of the enantiomeric cluster is C54H48Ag6N6S12 (called Ag6PL6/PD6 for short), the enantiomeric cluster belongs to the monoclinic system, and the space group is the chiral space group P213. The cluster has strong brown-yellow fluorescence at room temperature, and the fluorescence quantum yield reaches up to 97%, and is the highest quantum yield of reported silver nanoclusters with a precise atom structure; the structure of the material canbe stabilized at 160 DEG C, and still maintains luminescence; and the chiral structure and strong luminescent properties of the material make the cluster structure have a strong circularly polarized luminescence (CPL) property. The silver nano-cluster has the advantages of chiral structure, high stability, strong luminescence and high quantum yield, so the silver nano-cluster has excellent application prospects in fields of luminescent materials and chiral optical materials.

The invention discloses a silver nanometer cluster compound with an antibacterial activity and a preparation method thereof. The silver nanometer cluster compound is prepared by adopting biocompatible polymers and metal silver ions which produce polymer-included stable solution of the nanometer silver cluster compound under illumination. The nanometer silver cluster compound has physical properties, such as surface isoiony, of metal silver nanoparticles, can absorb visible light, thus loses sensitivity to light, can stably exist in solution for a long term, has a high surface area reaction activity of metal silver nanoparticles and has a stronger antibacterial activity. According to antibacterial activity experiments on staphylococcus aureus, the minimum inhibition concentration (MIC) is 5mu g/mL, which has already reached the lowest concentration limit which can be reached by the domestic and overseas similar best products.

The invention provides a biosensor for detecting uracil glycosylase. The biosensor comprises an UDG template, an S-HAP1 hybridization chain, HAP2-AgNCs and ExoIII enzyme, fluorescence detection is employed for detecting the activity of the uracil glycosylase, an excitation wavelength of the fluorescence detection is 560 nm, the emission wavelength is 625 nm, and a detection wave band is 575-750 nm. The biosensor has the advantages of good specificity, high sensitivity, mild reaction condition, and fast reaction speed; silver cluster detection is employed, operation is simple, a detection period is short, and carrying is easy; the technology cost is low, and the technology is suitable for low-cost requirement in industrialization; the preparation method is simple, the performance is stable,the repeatability is good, and the method is suitable for detecting UDG in field of medical treatment and public health.

The invention relates to a preparation method of an oil and water separating membrane with underwater super-oleophobic property and antibacterial property. The preparation method comprises the following steps of dissolving sodium alginate into water, so as to obtain a sodium alginate solution; coating the sodium alginate solution with membrane, and screening water-soluble salt with certain particle size into the sodium alginate solution coated with the membrane, so as to obtain a mixed membrane; immediately oscillating the mixed membrane in a crosslinking agent water solution by ultrasonic waves, and soaking into a crosslinking agent, so as to obtain a sodium alginate porous membrane; sequentially soaking the sodium alginate porous membrane into a silver nitrate solution and a reductant solution, so as to obtain the oil and water separating membrane. The oil and water separating membrane obtained by the preparation method has the advantages that the contact angel with oil is 155 to 168degrees in water; by adopting silver cluster particles with micro-nano composite structures, the roughness of the membrane surface is enhanced, the underwater super-oleophobic property is more excellent, the easiness in sticking by oil is avoided, and the oil and water membrane is suitable for separating the oil and water mixture with larger separating viscosity.

The invention provides a biosensor for detecting mercury ions on the basis of fluorescence. The biosensor comprises components as follows: a DNA-containing silver cluster, DNA capable of forming a G-quadruplet, potassium ions and heme. The biosensor is mild in detection reaction conditions, the reaction speed is increased, the operation complexity is reduced, and rapid, simple and sensitive detection of a target object is realized. The preparation method of the biosensor is simple, the performance is stable, the repeatability of the silver cluster is good, and the biosensor is mainly applied to detection of food safety and mercury ions in water and actual application of biosensor industrialization. A process for manufacturing the biosensor is low in cost and applicable to the cheap requirement in industrialization.

The preparation of silver quantum clusters embedded in organic-templated-boehmite-nanoarchitecture (OTBN) and its use as a sensor for quantity of water flow measured by change of color in visible light upon flow of contaminated water have been provided. Silver quantum clusters-embedded OTBN are highly luminescent. Since the quantum clusters are embedded in the matrix, they are highly stable over a long period of time. The composition described here is utilized in the form of a device for ‘visible/ultraviolet light color change-based detection’ upon passage of water through a water purification device. Upon interaction with ions present in water, luminescent silver clusters undergo chemical transformation to Ag₂S nanoparticles. The transformation is reflected in the form of visible color change (from pink to black) and luminescence quenching (from red emission to negligible luminescence).

The invention discloses a melamine concentration fluorescent sensor and a production method thereof. The melamine concentration fluorescent sensor is characterized in that electrostatic attraction acting force is utilized to prepare a positively-charged nano hydrotalcite laminate and modified negatively-charged nano silver cluster guest molecules into a composite film through a super-molecule layer-by-layer assembling method, and the fluorescent responses of the film sensor to the melamine solutions of different concentrations are inspected. The melamine concentration fluorescent sensor has the advantages that the hydrotalcite used in the melamine concentration fluorescent sensor is nontoxic, stable and good in biocompatibility, the organic laminate of the hydrotalcite is less prone to aging as compared with a polymer carrier and can be stored for a long time, the hydrotalcite laminate can keep the maximum dispersing of the guest nano silver cluster, the fluorescence quenching caused by guest molecule clustering can be prevented effectively, the optical stability of fluorescent molecules is kept, and the illumination stability of the fluorescent molecules is increased evidently; the sensor is good in selectivity on melamine and presents linear relation in a certain range.

The invention relates to a silver nano-cluster fluorescent nanorod, a preparation method thereof, and an application of the nanorod in white LED. The fluorescent nanorod is formed by self-assembling Ag9 and hydrochloric acid in an aqueous solution. The Ag9 fluorescent nanorod prepared in the invention has outstanding optical properties, still maintains excellent fluorescent performances after being freeze-dried into a powder, can be used to prepare orange red light-emitting LED with a good stability, and can be mixed with a commercial blue phosphor and a commercial green phosphor according toa mass ratio of 10:5:1 to prepare the white light-emitting LED. The luminescent silver cluster can successfully replace the light conversion material of traditional materials in order to provide possibility for producing environmentally-friendly LEDs. The preparation method of the silver nano-cluster fluorescent nanorod of the invention has the advantages of simplicity and low cost; and the prepared LED has an excellent luminous intensity, and meets environmental protection requirements.

The invention discloses an eight-core alkyne silver cluster material with thermochromic luminescent properties. The chemical formula of the eight-core alkyne silver cluster material is C38H48Ag8F9NO6.The structural chemical formula is Ag8(ButC-[triple bond]-C)5(CF3COO)3(CH3CN). The material is a silver cluster material with a novel structure. The silver cluster material is synthesized from a tertiary butyl alkyne silver ligand and a CH3CN ligand. The material has excellent thermochromic luminescent properties and can be applied to the technical field of temperature sensing and detection.

The invention discloses a detecting method for captopril through light emitting silver clusters synthesized by G insertion sequences, and belongs to the fields of food and medicine detection. A seriesof regular C-base-enriched DNA sequences are deigned for synthesizing nanometer silver clusters, the G insertion sequence with the best fluorescent brightness is selected for synthesizing the silverclusters, and a method for detecting captopril is built; a sample to be tested possibly containing captopril is added into a silver nanometer cluster solution, after a mixing reaction, and detection of captropril in the sample to be detected is achieved by observing the fluorescent strength of the formed mixed reaction system under the maximum excitation wavelength. The silver nanometer cluster synthesized by the DNA sequences is applied for detecting captopril, the detection linear range is 0.05-5 microgram/mL, the sensitivity can reach 0.05 microgram/mL, and the method has the advantages ofbeing easy, convenient and rapid to use, low in cost, high in sensitivity and the like, and can be applied to detection of captopril in healthy products of healthcare products, food, medicine productsand other healthy products.

The invention discloses a silver sulfur cluster material with a luminescent property and a preparation method and application thereof. The chemical formula of the silver sulfur cluster material is C101H184Ag34F30N2O39S16, and belongs to an orthorhombic crystal system, the space group is Pbac, and cell parameters are shown in the description. The silver sulfur cluster material is synthesized by adopting high-nucleus silver clusters modified by tert-butyl mercaptan, can be used for luminescent detection, and has the advantages that the preparation method is simple, the stability is high, and theluminescent property is excellent.

The invention discloses a spiro silver cluster luminescent cluster and a preparation method and an application thereof. A structural general formula of the cluster is shown as a formula I. The spiro silver cluster provided by the invention has a stable structure, and the quantum yield can achieve 5% to 30%, appears the photochromic behavior of external stimulation (mechanical force and a solvent),and has potential application prospects in the fields of mechanical sensing, organic solvent vapor monitoring, and luminescent materials.

The invention discloses a nanostructured bactericidal composite drug, and a preparation method thereof. According to the preparation method, sub-nanometer silver clusters modified via surface graftingwith bactericidal drug molecules are taken as a bactericidal component; and chemical assembly with a gold nanorod carrier is carried out so as to obtain the stable nanostructured bactericidal composite drug. In applications of the nanostructured bactericidal composite drug, drug accurate tracing and silver cluster rapid dissociation and controllable release are realized respectively because of the dark field optical imaging and light absorption heating characteristics of gold nanorod, the synergistic interaction of sub-nanometer silver clusters with unique bactericidal performance with the drug molecules is achieved fully, and guiding significance on design of high efficiency bactericidal drugs is achieved.