29 results about "Microbial adhesion" patented technology

The invention relates to the technical field of wastewater treatment materials, in particular to a preparation method of a nano-hydroxyapatite-based composite material, which comprises the following steps: selecting high-density polyethylene as a continuous phase matrix material and nano-hydroxyapatite as a functional filler, adding a silane coupling agent as an interface modifier, and carrying out hydrophilic modification through a hydrophilic agent to obtain the nano-hydroxyapatite-based composite material. The composite material is obtained through nano-hydroxyapatite pretreatment, melt blending, physical foaming and molding processing. The composite material is applied to an MBBR (Moving Bed Biofilm Reactor) for wastewater treatment; the compressive strength of the obtained composite material is greater than or equal to 15 MPa, and the annual wear rate lt Meanwhile, the microporous structure of the nano-hydroxyapatite provides a large number of active sites for microorganism attachment, the biological membrane quantity of the system can reach 35 g / L, the ammonia nitrogen removal rate is increased by 30-50% compared with the prior art, and the phosphorus adsorption capacity reaches 8-10 mg / g.

The application discloses a protein zwitterionic polymer conjugate and a preparation method and application thereof. A multifunctional new medical biomaterial with mucosal adhesion, wetting, lubrication and microbial adhesion prevention is designed and synthesized, so that a new breakthrough is brought to the clinical demand of solving Sjogren's syndrome. In addition, the application has wide application prospects in the fields of oral lubrication, ophthalmic lubrication, joint repair and the like.

This invention relates to the field of filter media technology, specifically to a modified fiber filter media, its preparation method, and a filter bed. The modified fiber filter media provided by this invention has a structure grafted onto it with the structure shown in formula (Ⅰ), where R1 in formula (Ⅰ) is (CH2). n The value of n ranges from 2 to 3. R2, R3, and R4 are independently selected from C1-C2 alkyl groups, R5 and R6 are independently selected from hydrogen and C1-C18 alkyl groups, and R7 is independently selected from at least one of C1-C18 alkyl groups or C1-C18 aromatic groups. This invention provides a group structure with strong hydrophobicity and antibacterial properties, which is beneficial for backwashing removal of pollutants. The hydrophobic surface can also reduce microbial adhesion and biofilm formation. Furthermore, the synthesized quaternary ammonium groups can disrupt the biofilm structure on the surface of the fiber filter media, improving the backwashing effect and regeneration capacity of the fiber filter media, and maintaining the long-term stable operation of the rapid filtration technology.

The application belongs to the technical field of electrochemical sensing, and particularly relates to an electrochemical sensing electrode with detection and anti-biofouling functions, a preparation method and application thereof. The electrochemical sensing electrode comprises a conductive substrate and a MOF-919 material loaded on the conductive substrate, and function mode switching is realized through external potential regulation. In the detection mode, a first working voltage is applied for nitrite oxidation detection; and a second working voltage is applied to release nitric oxide in situ by reducing nitrite to inhibit microbial adhesion on the electrode surface. The application does not need to additionally set an independent antibacterial layer or add an antibacterial agent, realizes the interface anti-microbial adhesion function while maintaining good electrochemical response performance of the electrode, and significantly improves the stability of long-term use in complex samples. The application provides a new technical path for anti-pollution design of an electrochemical sensing interface.

This utility model provides a corrosion-resistant shell structure for a marine engineering platform, relating to the field of marine engineering platform technology. It includes: a support column body, with two protective devices on its surface. Each of the two protective devices is filled with filler, and multiple buffer devices are provided on the surface of each of the two protective devices. In this utility model, the impact of waves and splashes first strikes the protective plate surface, where it is buffered by springs and dampers, reducing the impact on the support column body and enhancing the service life of the protection. An antibacterial layer is coated on the outer side of the arc-shaped hollow protective shell to inhibit microbial adhesion and metabolic corrosion, while a plasma-polymerized coating is coated on the inner side of the arc-shaped hollow protective shell to increase the pitting potential of the stainless steel. Combined with an electromagnetic energy storage device, dynamic potential compensation is achieved. Furthermore, the metal support rods filled inside the arc-shaped hollow protective shell reduce resistance and potential fluctuations, resulting in a more uniform current distribution.

The invention discloses a microorganism colonization membrane assembly for river regulation, and relates to the technical field of river regulation, the microorganism colonization membrane assembly comprises a mounting box with an opening at the upper end, two partition plates are fixedly mounted in the mounting box at intervals, and the two partition plates sequentially divide the mounting box into a microorganism enrichment area, a metabolism diffusion area and a fluid exchange area from front to back; the three regions are respectively filled with a microorganism colonization membrane, a fluid flow guide membrane and a honeycomb membrane, and the side wall of one side, far away from the partition plates, of the microorganism enrichment region and the two partition plates are respectively provided with water permeable holes through which water flows to pass; the surface of the microbial colonization membrane is provided with nano-scale villus-shaped secondary ripples. According to the microorganism colonization membrane assembly for river regulation, through cooperation of the biological anchor points and the chemotactic factor coating, the microorganism attachment efficiency (the survival rate is increased by 40% or above) and the impact load resistance are remarkably improved, and the problems that in traditional biological remediation, microorganism colonization is difficult, and activity is low are solved.

The invention discloses a spiral modified MBBR filler as well as a preparation method and application thereof, and belongs to the technical field of sewage treatment. The filler takes high-density polyethylene (HDPE) as a matrix and comprises the following raw materials in parts by weight: 100-105 parts of HDPE, 7-9 parts of modified hydrotalcite, 4-6 parts of an auxiliary agent, 0.7-0.9 part of an initiator, 1-2 parts of polyvinyl alcohol, 1-2 parts of chitin, 1.5-3 parts of gelatin, 5-10 parts of activated carbon, 0.5-1 part of zinc stearate and 0.3-0.5 part of an EBS dispersing agent. By optimizing the material formula and the structural design, the filler is endowed with a three-dimensional spiral porous structure, the surface roughness and the biocompatibility of the filler are effectively enhanced, and the initial attachment of microorganisms and the formation of a biological membrane are remarkably promoted. Meanwhile, due to introduction of the composite additive, ultraviolet aging is effectively delayed, the service life of the filler is prolonged, it is guaranteed that the filler still keeps excellent degradation performance in a complex sewage environment, and the filler is suitable for efficient treatment of complex water quality.

This invention discloses a test method for evaluating the inhibitory effect of microbial pesticides on the activity of Daphnia macrocarpa, relating to the field of pesticide detection. The method includes an outer casing, a layered test cylinder, an air supply assembly, a water quality monitoring probe, and a light source. The outer casing has a hinged lid and a transparent observation window on its front. The layered test cylinder is housed within the outer casing. This method innovatively uses a layered test cylinder composed of a test cylinder, an isolation cylinder, and a pesticide loading cylinder. The Daphnia macrocarpa in the test cylinder is isolated from the microbial pesticide in the pesticide loading cylinder, but the water in the test cylinder and the pesticide loading cylinder exchange water through an exchange port. This method realistically simulates the natural exposure state of Daphnia macrocarpa in water containing microorganisms and effectively avoids the problem of microbial adhesion interfering with Daphnia macrocarpa activity, thus significantly improving the accuracy of the test results.

The utility model belongs to the technical field of sewage treatment, and relates to a Fenton sludge biochar artificial wetland coupling microbial fuel cell, which comprises a container main body, the container main body is in a cylindrical barrel shape, Fenton sludge biochar is filled in the barrel to enhance sewage treatment and microbial attachment effects, a water sampling port is arranged on the wall of the barrel, and a water sampling port is arranged on the wall of the barrel. A water outlet is formed in the bottom of the barrel, a water inlet is formed in the top of the barrel, a large gravel layer, a medium gravel layer, a medium gravel layer and a small gravel layer are sequentially arranged in the barrel from bottom to top, the Fenton mud biochar layer is arranged between the medium gravel layer and the medium gravel layer, the anode is embedded between the Fenton mud biochar layer and the medium gravel layer, and the cathode is located on the surface of the small gravel layer and exposed in the air. According to the device disclosed by the utility model, after the charcoal fired by the Fenton mud is added into the constructed wetland, the growth of heterotrophic denitrification and iron-related microorganisms can be stimulated, and the removal efficiency of nitrate nitrogen is improved. The battery can realize efficient nitrogen and phosphorus removal treatment of sewage, and has a relatively high application value.

The invention relates to a biological adhesion prevention coating as well as a preparation method and application thereof, and belongs to the technical field of biological adhesion prevention coatings. The technical problem that the service life and the effect of an existing anti-biological-adhesion coating cannot be effectively guaranteed is solved. The coating comprises a bottom treatment agent and a composite resin coating, the bottom treating agent comprises epoxy film-forming resin, an active monomer, an initiator, an epoxy curing agent, an organic solvent, a flatting agent, a defoaming agent and a thickening agent; the composite resin coating comprises non-epoxy film-forming resin, epoxy film-forming resin, an active monomer, an initiator, an epoxy curing agent, an organic solvent, a dispersing agent, a flatting agent, a defoaming agent, a thickening agent, conductive filler and zinc oxide. The coating is good in construction performance, high in construction flexibility and suitable for various application scenes, and can also serve as a coating repairing material to conduct on-site repairing on a local anti-biological-adhesion coating, and the prepared coating is good in anti-microbial adhesion, good in corrosion resistance, high in adhesive force and good in barrier property and weather resistance.

The present application belongs to the technical field of functional composite coating materials, and particularly relates to an epoxy resin-based nano-composite protective coating material, a preparation method and application thereof. The method uses natural attapulgite and copper chloride dihydrate as raw materials, and adopts chemical bath deposition and hydrothermal method to load polydopamine-copper and defect-rich cerium oxide into attapulgite respectively, to obtain a defect-rich cerium oxide / polydopamine-copper / attapulgite nano-composite material. Then, the material is mixed with epoxy resin E51 and diluent to obtain an epoxy resin-based protective coating material with both corrosion and algae resistance and photo-thermal deicing functions. The coating material has long-term and complex environment-resistant corrosion resistance, and also has excellent high and low temperature salt spray complex environment aging resistance and anti-microbial adhesion performance, and is suitable for high-voltage transmission and distribution tower, oil field ground equipment metal structure corrosion protection in high-cold regions and humid environments.

The invention discloses a multi-dimensional quantitative detection method for microbial corrosion resistance of Cr-containing steel. The method comprises the following steps: a microbial challenge test: inoculating sulfate reducing bacteria into a culture medium, and exposing a sample in a microbial environment; performing quantitative analysis on corrosion products: performing ultrasonic rust removal on the sample by using an acid pickling solution, then calculating a weightlessness corrosion rate, and quantifying the adhesion amount of microorganisms on the surface of the sample; multi-mode electrochemical testing: monitoring the open-circuit potential and linear polarization resistance of the sample, and performing electrochemical impedance spectroscopy and potentiodynamic polarization curve testing to obtain corrosion current density and polarization resistance; surface analysis: analyzing the corrosion morphology and element distribution of the sample through a scanning electron microscope and an energy disperse spectroscopy, and determining the chemical state of the chromium element by adopting X-ray photoelectron spectroscopy to obtain the stability and the sulfur content of a passive film; and evaluating the corrosion degree: establishing a coupling model of the corrosion current density, the polarization resistance, the passivation film stability, the microorganism adhesion amount and the sulfur content, and calculating the corrosion degree.

The application discloses a water quality impurity-removing water-saving purification device for hydraulic engineering and relates to the field of hydraulic engineering, which comprises a barrel body and an upper cover body. A filler box, a funnel and a purification box are sequentially arranged in the barrel body from top to bottom. The top and bottom of the funnel are respectively connected with the bottom of the filler box and the top of the purification box. Three horizontal plates for microbial adhesion are arranged in the purification box. The three horizontal plates are fixedly connected through connecting rods. A movement assembly is arranged above the horizontal plates in the purification box. The movement assembly is used for controlling the vertical reciprocating movement of the three horizontal plates, expanding the contact area between the microorganisms and the water body. A disturbance assembly is arranged in the filler box and the funnel. The disturbance assembly is used for moving along with the movement of the movement assembly, dispersing the filler gathered in the filler cavity and avoiding caking. The application can expand the contact area between the microorganisms and the water body, make the microorganisms sufficiently decompose the high-molecular organic matters in the water, and disperse the filler, thereby avoiding the caking phenomenon.

The application discloses an electrospun composite membrane for slow release of bacterial population response signal molecules and a preparation method and application thereof, and belongs to the field of sewage biological treatment. The application provides an electrospun composite membrane for slow release of bacterial population response signal molecules and a preparation method and application thereof. The composite membrane comprises a base membrane obtained by electrospinning and a functional layer, the functional layer is a fiber with a core-shell structure, the shell layer is a polymer, the core layer is a polymer containing bacterial population response signal molecule material, the base membrane is obtained by uniaxial electrospinning technology, and the functional layer is obtained by uniaxial emulsion electrospinning or coaxial electrospinning technology. The obtained composite membrane has good air permeability, high oxygen transfer rate, large specific surface area and high roughness, which provides favorable conditions for microbial adhesion, and when the composite membrane is used for assembling a flat membrane module and applied to an MABR process, an excellent ammonia nitrogen removal rate can be obtained.

To provide a cross-linked resin with excellent biodegradability and microbial adhesion properties. [Solution] A crosslinked resin which is a reaction product of a compound (A) having an active hydrogen group and being biodegradable and a compound (B) having an α,β-unsaturated carbonyl functional group and being biodegradable.

The problem addressed by the present invention is to provide a method for starting an anaerobic processing tank that efficiently advances microbial adhesion to carrier surfaces and makes it possible to shorten the amount of time required to start an anaerobic processing tank.　In order to solve this problem, the present invention provides a method for starting an anaerobic processing tank, the method comprising a carrier coating step that includes: a flocculant loading step in which a flocculant is loaded into an anaerobic processing tank after the anaerobic processing tank has been filled with a carrier; and a sludge loading step in which sludge is loaded into the anaerobic processing tank after the flocculant loading step. The carrier coating step is performed multiple times.　According to the present invention, a substance that contributes to microbial adhesion is loaded in a prescribed order and the foregoing is repeated a plurality of times, thereby making it possible to produce a state in which the sludge-coated carrier is accommodated in the entire interior of the anaerobic processing tank in a short amount of time. Namely, when starting the anaerobic processing tank, microbial adhesion to carrier surfaces is efficiently advanced such that the amount of time required to start the anaerobic processing tank can be shortened.

The invention discloses a water conservancy project water quality impurity removal and water saving purification device, and relates to the field of water conservancy project, the water conservancy project water quality impurity removal and water saving purification device comprises a barrel body and an upper cover body, the barrel body is internally provided with a filler box, a funnel and a purification box in sequence from top to bottom, and the top and the bottom of the funnel are communicated with the bottom of the filler box and the top of the purification box respectively; three stacked horizontal plates used for attachment of microorganisms are arranged in the purification box, the three horizontal plates are fixedly connected through connecting rods, a moving assembly is arranged in the purification box and located above the horizontal plates, and the moving assembly is used for controlling the three horizontal plates to do vertical reciprocating motion, so that the contact area of the microorganisms and a water body is enlarged, and the water body is purified. Disturbance assemblies are arranged in the filler box and the funnel, the disturbance assemblies are used for moving along with the movement of the movement assembly and scattering the filler gathered in the filler cavity to avoid caking, the contact area between microorganisms and the water body can be enlarged, the microorganisms and the water body can fully decompose high-molecular organic matter in water, the filler can be scattered, and the water quality is improved. The caking phenomenon is avoided.

The application belongs to the technical field of super-hydrophilic coating, and particularly relates to a self-repairable super-hydrophilic coating, a preparation method and application thereof.The self-repairable super-hydrophilic coating comprises the following components in parts by weight: 10-20 parts of epoxy resin, 1-5 parts of curing agent, 10-150 parts of solvent, 0-7 parts of nano filler, 5-15 parts of modifier and a hydrophilic component dissolved in another solvent.The super-hydrophilic coating has excellent oil pollution prevention characteristics, and can have antibacterial, scale inhibition and drag reduction characteristics, and can be applied to the fields of oil adhesion prevention, microbial adhesion prevention, underwater drag reduction, oil-water separation and the like, can effectively resist conventional organic oil phase pollution, even high-viscosity crude oil pollution, and can be repaired in water, strong acid, strong base, high salt and artificial seawater, solving the problem that the existing super-hydrophilic coating cannot be repaired in an extreme underwater environment.

This invention relates to the field of wood-plastic composite (WPC) flooring materials, specifically to a microbial-resistant and antibacterial WPC flooring and its preparation method. It addresses the problems of traditional WPC flooring's insufficient mechanical properties, susceptibility to cracking and deformation after long-term use, and extreme susceptibility to adhesion and erosion by bacteria, fungi, algae, and other microorganisms, which not only affect aesthetics but may also spread pathogens and endanger human health. This WPC flooring uses polyethylene resin as the main raw material, giving it excellent weather resistance. Adding modified wood flour, fluorinated cationic compounds, and modified zinc oxide significantly improves the mechanical properties of the WPC flooring and effectively enhances its resistance to microbial adhesion and antibacterial properties, ensuring its cleanliness, hygiene, and durability in daily life, thus meeting the demand for high durability and hygiene standards for WPC flooring.

The present application relates to a kind of heat sublimation ink and its preparation method and medical PET material, belong to the technical field of ink.A kind of heat sublimation ink includes the following components: pigment paste, modified polyurethane, surfactant, organic solvent and deionized water.The silver ion polyurethane coating of the PET substrate material surface of the present application, can provide broad-spectrum antibacterial basis by the slow-release effect of silver ion;Outer layer ink containing modified polyurethane further inhibits microbial adhesion and biofilm formation by charge adsorption, interference and destruction of microbial reproduction mechanism, double antibacterial mechanism covers different bacteria, and the antibacterial time efficiency is prolonged;The self-antibacterial property of ink formation layered structure avoids that traditional printing mark area becomes pollution loophole, especially suitable for surgical instrument packaging, reusable consumables and other high-risk infection scenarios.

The invention relates to the technical field of filter materials, in particular to a modified fiber filter material, a preparation method thereof and a filter tank. According to the modified fiber filter material provided by the invention, a structure shown in a formula (I) is grafted on the fiber filter material, in the formula (I), R1 is (CH2) n, the value range of n is 2-3, R2, R3 and R4 are independently selected from C1-C2 alkyl groups, R5 and R6 are independently selected from hydrogen and C1-C18 alkyl groups, and R7 is independently selected from at least one of C1-C18 alkyl groups or C1-C18 aromatic groups. The invention provides a group structure with strong hydrophobicity and antibacterial property, which is beneficial to backwashing removal of pollutants, the hydrophobic surface can also reduce microbial attachment and biofilm formation, the biofilm structure on the surface of the fiber filter material can also be destroyed by using the synthesized quaternary ammonium group, the backwashing effect and regeneration capacity of the fiber filter material are improved, and the fiber filter material can be recycled. And long-term stable operation of the rapid filtering technology is maintained.

The utility model discloses a kind of microbial porous activated carbon carriers, including cubic carrier, the cubic carrier is formed by several evenly distributed independent carrier structures, the inside of several independent carrier structures is fixedly provided with elastic culture structure, the opening direction of elastic culture structure corresponds with the opening direction of independent carrier structure, a kind of microbial porous activated carbon carrier of the utility model, multi-scale gap in carrier and elasticity are cooperated, through the slot of independent cubic carrier, the splicing interface of hexagonal splicing plate, the micropore of activated carbon coating forms the tertiary porous structure of " macroscopic channel-mesoporous pore-microscopic adsorption site", material transmission efficiency and microbial adhesion area are considered, cooperate the dynamic buffer design of elastic culture structure, solve the problem that biofilm is easy to fall off under water flow impact in traditional rigid carrier, improve the stability of system operation.

The invention provides a photosensitizer and NO combined nanofiber membrane / sponge double-layer dressing for promoting diabetic wound healing and a preparation method and application thereof.The dressing comprises an upper layer and a lower layer, and the upper layer is a nanofiber membrane prepared from a first polymer and metal oxide through an electrostatic spinning technology; and the lower layer is sponge prepared from a second polymer, a third polymer, a polyether compound, an NO donor and a photosensitizer through a cross-linking process. The first polymer and the metal oxide are combined, an in-situ electrostatic spinning method is adopted for preparing the outer-layer nanofiber dressing, the dressing is endowed with a hydrophobic barrier function through the bionic lotus leaf effect, and microbial adhesion and external foreign matter invasion are prevented; the nucleophilic substitution between the amino groups in the second polymer and the third polymer and the ester group of the cross-linking agent can form amide for cross-linking, and the photosensitizer and the NO donor are added to prepare the cross-linked sponge, so that the effects of efficient sterilization and hemostasis are realized.

This utility model relates to the technical field of sanitary pumps. A sanitary pump includes a motor and a coupling. The output shaft of the motor is threadedly connected to the coupling via bolts. An electric coupling is installed on the outer wall of the motor. The outer wall of the coupling is fixedly connected to the pump shaft. The end of the pump shaft is fixedly connected to an impeller. A connecting mechanism is connected to the outer wall of the motor. The connecting mechanism uses a housing and pump body bolted together to enhance sealing. The housing and pump body are made of 316L stainless steel and mirror-polished to prevent microbial adhesion and facilitate cleaning and sterilization. Rubber pads on the mounting mechanism reduce vibration and noise. Fixing holes improve adaptability to different scenarios. Flanges enhance sealing when connected to the outside. The overall structure is stable. The housing, pump body, and each part of the housing can be disassembled in sections using bolts, making maintenance more convenient.

This utility model relates to the field of sponge city technology, and more particularly to an integrated water-storage ecological flower bed, comprising: a box body and a water-storage layer, a planting soil layer, and a gravel layer arranged sequentially from top to bottom inside the box body. This invention employs a multi-level porous gravel layer with a coarse-fine-coarse tiered design, which can progressively intercept pollutants, effectively preventing clogging of the gravel layer and ensuring its permeability. A honeycomb grid plate fixes individual gravel structural units, forming a stable framework for each unit, preventing particle movement and improving compressive strength and flow conductivity. The synergistic effect of the coarse-grained layer, functional layer, and flow-guiding layer adsorbs pollutants and promotes microbial adhesion, thereby enhancing anti-clogging and purification performance. By embedding a backwashing structure within the flow-guiding layer, periodic backwashing can be used to remove clogging particles from the gravel layer, further improving anti-clogging performance.

The invention belongs to the technical field of sediment fuel cells, and particularly discloses a high-strength and high-microbial adhesion rate sediment fuel cell anode and a preparation method thereof. The preparation method comprises the following steps: mixing carbon black, carbon nanotubes and stearic acid to obtain mixed carbon powder; then mixing and granulating with high-density polyethylene, a coupling agent and graphene nanoplatelets to obtain composite granules, and processing the composite granules to obtain thick strips with holes; then sequentially carrying out pretreatment and bacterial liquid inoculation to obtain a microorganism attachment thick strip; and carrying out ultrasonic welding on the microorganism adhesion thick strips to form a geocell structure, so as to obtain the high-strength and high-microorganism adhesion rate sediment fuel cell anode. The obtained anode of the sediment fuel cell has excellent strength and microbial adhesion rate, shows good biocompatibility, and promotes the practical application of the sediment fuel cell.

The invention discloses a gas circulation type sterilization device for producing capsules, and relates to the technical field of capsule production, the gas circulation type sterilization device comprises a bottom plate, and a rack is welded on the upper surface of the bottom plate. By arranging the bottom plate and the rack, a stable bearing foundation and structural support are provided for the whole gas circulation type sterilization device, and the bottom plate is generally made of a corrosion-resistant and easy-to-clean material, so that long-term stable operation in a clean production environment is ensured; the rack adopts a frame structure, the sterilization box is lifted to a proper working height, so that an operator can conveniently load and unload capsules, and a mounting space is reserved for other accessory equipment; and the sterilization box is welded at the end part of the rack. By arranging the sterilization box, a closed and controllable sterilization reaction chamber is formed and is a core container of the whole device, mirror polishing treatment is generally carried out on the inner wall of the sterilization box so as to reduce gas flow resistance and microorganism attachment, and the effect that sterilization gas is in full contact with capsules is achieved.

The application relates to a kind of high molecular material of filter bag microbial adhesion resistance bacteria membrane and its preparation method, belong to high molecular material preparation technical field, by silane coupling agent in SiO2 Surface introduction carboxyl and other organic functional groups, obtain the pretreatment SiO2 Filler, then be used to enhance PET, obtain the modified PET fiber with SiO2 Reinforcement.Finally, the fiber is immersed in the protein after acylation treatment, and a amyloid protein layer is constructed on the fiber surface by reducing disulfide bond, to prevent microbial adhesion effect.The anti-bioadhesion material prepared by the application has good mechanical properties, and the advantages of anti-microbial and algal adhesion.

Provided are antimicrobial compositions and methods for depositing or coating an antimicrobial or antibacterial composition on a substrate to prevent microbial adhesion. The antimicrobial composition can include a cationic polymer having a polyallylamine backbone. A portion of the polyallylamine backbone can be functionalized to have at least one of a guanidine functional group and a biguanide functional group.