Electrospray Process Research Articles

Tailoring Mesopores and Nitrogen Groups of Carbon Nanofibers for Polysulfide Entrapment in Lithium-Sulfur Batteries.

In the current work, we combined different physical and chemical modifications of carbon nanofibers through the creation of micro-, meso-, and macro-pores as well as the incorporation of nitrogen groups in cyclic polyacrylonitrile (CPAN) using gas-assisted electrospinning and air-controlled electrospray processes. We incorporated them into electrode and interlayer in Li–Sulfur batteries. First, we controlled pore size and distributions in mesoporous carbon fibers (mpCNF) via adding polymethyl methacrylate as a sacrificial polymer to the polyacrylonitrile carbon precursor, followed by varying activation conditions. Secondly, nitrogen groups were introduced via cyclization of PAN on mesoporous carbon nanofibers (mpCPAN). We compared the synergistic effects of all these features in cathode substrate and interlayer on the performance Li–Sulfur batteries and used various characterization tools to understand them. Our results revealed that coating CPAN on both mesoporous carbon cathode and interlayer greatly enhanced the rate capability and capacity retention, leading to the capacity of 1000 mAh/g at 2 C and 1200 mAh/g at 0.5 C with the capability retention of 88% after 100 cycles. The presence of nitrogen groups and mesopores in both cathodes and interlayers resulted in more effective polysulfide confinement and also show more promise for higher loading systems.

Co-axial electrospraying of injectable multi-cancer drugs nanocapsules with polymer shells for targeting aggressive breast cancers

BackgroundThere is growing potential for nanocarrier-based drug delivery in cancer. However, an incomplete understanding of nano–bio interactions and the challenges regarding processing and fabrication in scale-up engineering techniques, controls over drug release, efficacy, and cytotoxicity to the human cell are the major challenges for its clinical success. The purpose of the study was to develop an electrospraying processing of injectable nanonized encapsulated chemotherapeutics to target primary and metastatic breast cancer tumor microenvironment for precise and controlled delivery.ResultsA novel coaxial electrospraying of multiple cancer drugs (paclitaxel and GW2580) as core and polycaprolactam (PCL) as the shell has been developed to produce multi-cancer drug nanocapsules. Using electrospraying process, we have successfully made nanocapsules containing paclitaxel to target breast cancer cells and GW2580, a colony-stimulating factor 1 receptor (CSF1R) inhibitor to target CSF1R+ myeloid cells in the tumor microenvironments (TME). The UV–vis drug release test for 14 days shows a prolonged and sustained release pattern of both the drugs. In vitro and in vivo results showed the effects of nanocapsules containing multiple drugs in controlling the growth of tumor cells and increased survival of the animal bearing breast cancers.ConclusionNanonized multi-cancer drugs were encapsulated in a PCL shell. The drug doses ratio and the polymer-to-drug ratio were controlled by engineered process parameters. The studies showed the importance of making nanocapsules containing nanocrystals of multiple drugs, which will pave the way of making multiple drug combinations in a controlled manner and capsules can be designed for sustained release of the drugs after accumulation into the TME. TME-directed therapy can be a norm in future cancer treatment strategies. These injectable nanocapsules will allow cancer site-specific precision and controlled delivery to cure primary and metastatic breast cancer and to overcome the chemotherapy resistance.

Monothetic Analysis and Response Surface Methodology Optimization of Calcium Alginate Microcapsules Characteristics.

Owing to bio-polymer’s low-cost, environmental friendliness and mechanically stable nature, calcium alginate microcapsules have attracted much interest for their applications in numerous fields. Among the common production methods, the Electrospraying technique has shown a great potential due to smaller shape capsule production and ease of control of independent affecting parameters. Although one factor at a time (OFAT) can predict the trends of parameter effect on size and sphericity, it is inefficient in explaining the complex parameter interaction of the electrospray process. In the current study, the effects of the main parameters affecting on size and sphericity of the microcapsules using OFAT were optimized to attain calcium alginate microcapsules with an average diameter below 100 µm. Furthermore, we propose a statistical model employing the Surface Responses Methodology (RSM) and Central Composite Design (CDD) to generate a quadratic order linear regression model for the microcapsule diameter and sphericity coefficient. Experimentally, microcapsules with a size of 92.586 µm and sphericity coefficient of 0.771 were predicted and obtained from an alginate concentration of 2.013 w/v, with a flowrate of 0.560 mL/h, a needle size of 27 G and a 2.024 w/v calcium chloride concentration as optimum parameters. The optimization processes were successfully aligned towards formation of the spherical microcapsules with smaller average diameter of less than 100 µm, owing to the applied high voltage that reached up to 21 kV.

A well-designed polystyrene/polycarbonate membrane for highly saline water desalination using DCMD process

A novel porous polycarbonate (PC) membrane was fabricated using ethanol as non-solvent deploying immersion-precipitation process. To further increase surface hydrophobicity, polystyrene (PS) microbeads were sprayed on PC support using an air-assisted electrospraying process. Due to the micro/nano roughness of the PS layer, the formed dual-layer PS/PC membrane possessed outstanding wetting resistance over the neat PC membrane. The water contact angle (WCA) of the neat PC and PS/PC membranes was measured as 95.2 and 155.1°, respectively. Liquid entry pressure of water represented a considerable enhancement of 84.6% compared to the neat membrane. Direct contact membrane distillation (DCMD) evaluation was performed using the fabricated and commercially available polytetrafluoroethylene (PTFE) membranes. Using concentrated saline water as feed (150 g/L), only PS reinforced PC (PS/PC) membrane showed nonwetting capability with stable DCMD performance during continuous long-term DCMD evaluation. Superhydrophobicity of PS/PC not only diminished pore wetting but also increased permeate flux considerably (45.9%↑) to produce high-quality permeate flux (˂4.6 μS/cm). Considering these attributes, using the low-cost PC polymer along with the high-productive air-assisted electrospraying process is a facile route to fabricate decent membranes for the membrane distillation (MD) process.

Electrosprayed Nanoparticles as Drug Delivery Systems for Biomedical Applications.

Nanotechnology is a tool being used intensely in the area of drug delivery systems in the biomedical field. Electrospraying is one of the nanotechnological methods, which is growing due to its importance in the development of nanoparticles comprising bioactive compounds. It is helpful in improving the efficacy, reducing side effects of active drug elements, and is useful in targeted drug delivery. When compared to other conventional methods like nanoprecipitation, emulsion diffusion, and double emulsification, electrospraying offers better advantages to produce micro/nanoparticles due to its simplicity, cost-effectiveness, and single-step process. The aim of this paper is to highlight the use of electrosprayed nanoparticles for biomedical applications. We conducted a literature review on the usage of natural and synthetic materials to produce nanoparticles, which can be used as a drug delivery system for medical purposes. We summarized a possible key role of electrosprayed nanoparticles in different therapeutic applications (tissue regeneration, cancer). The modest literature production denotes that further investigation is needed to assess and validate the promising role of drug-loaded nanoparticles through the electrospraying process as noninvasive materials in the biomedical field.

Formation and characterization of zein electrosprayed nanoparticles containing bioactive compounds

The objective of this work is to investigate the nanoencapsulation of valuable bioactive compounds with the innovative electrohydrodynamic technology. More specifically, electrospraying, was applied for the encapsulation of three different active agents with lipolytic, anti-aging and antioxidant activity: Deoxycholic acid (DCA), olive leaves’ enzymatically modified extract and a hybrid of Deoxycholic acid-Hydroxytyrosol (DCA-HXT) in zein (ZN) biodegradable polymer. The resulting powders were evaluated regarding the system's: compositional and chemical characteristics, thermal stability and humidity effect, morphology, shape and size, encapsulation efficiency and release kinetics from the wall material. Encapsulation led to stable nanosystems, regarding the moisture and temperature effect, with high glass Transition Temperatures (Tg between 130-139 °C), and a mean particle size of 400-600 nm. Finally, high encapsulation efficiencies (DCA= 84.01%, DCA-HXT = 79.34% and modified extract =80.75%) and long-term release profiles (DCA=192 h, DCA-HXT=228 h and mod. extract=100 h) were measured for all three systems. Based on these results, we conclude that electrospraying process is an effective methodology for the development of bioactive agents’ nanosystems with excellent physicochemical properties and increased bioavailability; a crucial factor for the formation of high added-value products such as cosmetics.

Albumin grafted coaxial electrosparyed polycaprolactone-zinc oxide nanoparticle for sustained release and activity enhanced antibacterial drug delivery.

One of the most serious issues faced by the healthcare sector is the development of multidrug resistance among various pathogens. It is such that developing new and more capable drugs takes far too long to counter such resistance. In order to overcome these concerns, this study focused on improving upon the coaxial electrospraying process by producing cloxacillin loaded albumin polycaprolactone (PCL) with a ZnO coating for sustained and activity enhanced drug delivery. Albumin-grafted, polycaprolactone-coated, zinc oxide-loaded cloxacillin (APCL-CLOX-ZnO) nanoparticles with a diameter of 85–110 nm were obtained via a coaxial electrospray technique. The encapsulation efficiency of cloxacillin of ZnO-CLOX was found to be approximately 60%. The loading efficiencies of ZnO-CLOX and APCL-CLOX-ZnO were found to be 40% and 28% respectively. Albumin was employed in order to impart immune evasion properties to the formulation. Drug-loaded ZnO NPs were analyzed using SEM, TEM, FT-IR and TGA. This novel formulation was shown to possess sustained release characteristics owing to the PCL and albumin coatings, relative to uncoated counterparts. ZnO-CLOX and APCL-CLOX-ZnO exhibited 72% and 52% cloxacillin release within 24 h. APCL-CLOX-ZnO exhibited potent antimicrobial activity against S. epidermidis, B. cereus and P. aeruginosa and some activity against E. coli with inhibition zones 32 ± 1.4, 34 ± 0.3, 32 ± 0.6 and 11 ± 0.4 mm, respectively. Cytotoxicity studies against murine preosteoblast cells revealed that the albumin-PCL coating served to drastically reduce initial toxicity against healthy mammalian cells. In vitro lung deposition study showed 70% of APCL-CLOX-ZnO particles can reach up to the alveoli level. Therefore, this novel coaxial nanoformulation may serve as a promising drug delivery platform for the treatment of bacterial infections including respiratory tract complications.

DEVELOPMENT AND CHARACTERIZATION OF VITAMIN B9 - ELECTROSPRAYED NON-WOVEN SURFACES FOR WOUND HEALING APPLICATIONS

In this study, novel wound dressing materials based on non-woven (NW) surfaces were developed using electrospraying (e-spraying) process. Polyester spunbond (PET SPB), polypropylene spunbond (PP SPB), and polypropylene melt-blown (PP MB) surfaces used as matrix, and folic acid (FA), vitamin B9 were sprayed on these surfaces. The resulting NW fabrics with the same FA content were investigated in terms of chemical, morphological, thermal, wettability properties. Scanning Electron Microscopy and (SEM) and Fourier Transform Infrared (FT-IR) spectroscopy results showed formation of physical interaction between NWs and FA is successfully deposited onto NWs with average fiber diameters from 2.6 µm to 23.11 µm. According to the thermogravimetric analysis (TGA) FA loaded-PP SPB have enhaced thermal stability compared to pure one (PP SPB). The FA-loaded surfaces have hydrophobic property with contact angles values more than >90°. The in-vitro release was carried out by UV-Vis within the 8 hour-period phosphate buffer saline (pH 7.2). The results indicated that FA-loaded surfaces have a fast release behaviour. The total FA release amounts of the FA-loaded PET SBP, PP SPB and PP MB NWs were found as 22.8, 17.1, and 17.5 ppm. Moreover, biocompatibility of all resulting NW surfaces was assessed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and neutral red uptake (NRU) cytotoxicity tests in L929 cell lines. The obtained NWs have biocompatible and non-toxic material except PET SPB-sFA.The study indicated that FA-loaded NWs can be potential candidates for wound healing applications.

Vapor-Mediated Infiltration of Nanocatalysts for Low-Temperature Solid Oxide Fuel Cells Using Electrosprayed Dendrites.

Electrode architecturing for fast electrochemical reaction is essential for achieving high-performance of low-temperature solid oxide fuel cells (LT-SOFCs). However, the conventional droplet infiltration technique still has limitations in terms of the applicability and scalability of nanocatalyst implementation. Here, we develop a novel two-step precursor infiltration process and fabricate high-performance LT-SOFCs with homogeneous and robust nanocatalysts. This novel infiltration process is designed based on the principle of a reversible sol-gel transition where the gelated precursor dendrites are uniformly deposited onto the electrode via controlled nanoscale electrospraying process then resolubilized and infiltrated into the porous electrode structure through subsequent humidity control. Our infiltration technique reduces the cathodic polarization resistance by 18% compared to conventional processes, thereby achieving an enhanced peak power density of 0.976 W cm-2 at 650 °C. These results, which provide various degrees of freedom for forming nanocatalysts, exhibit an advancement in LT-SOFC technology.

Photoresponsive Superhydrophobic Membrane Crosslinked by Bipedal Pillararenes with Patterned Wettability

AbstractThe facile fabrication of superhydrophobic membrane with patterned and controllable wettability is crucial to the exploitation of precise control of water flow path. Here, an azobenzene‐bridged bipedal pillararenes‐crosslinked polypseudorotaxane is used to fabricate a superhydrophobic membrane via the combination of electrospraying and breath figure approaches. Regulation of the relative humidity during electrospraying process and the trans‐cis isomerization of azobenzene provide the capability to control the water adhesion force of membrane. These rules are applied to engineer the wettability of membrane into various patterns via re‐electrospraying or light irradiation with patterned photomask. These efforts demonstrate the potential of polypseudorotaxanes for applications in smart membrane with patterned wettability.

Synthesis and properties of core-shell thymol-loaded zein/shellac nanoparticles by coaxial electrospray as edible coatings

In this study, a coaxial electrospray process was used to produce nanoparticles, in which thymol was encapsulated in a core–shell of zein and shellac. We then investigated fluid velocity and solution concentrations on the electrospray. Scanning electron microscopy revealed that the thymol/zein/shellac particles prepared at a flow rate ratio of 0.6:0.3 mL/h were rounder with smaller diameters. The highest encapsulation efficiency of thymol was 81.34%, the average particle size was 606.53 nm, and the retention rate of thymol was 68.74% after 30 days. Moreover, we investigated the thermal stability, antimicrobial activity, and simulated gastrointestinal release curves of the nanoparticles. Finally, the nanoparticles were used as a coating for fresh-cut cantaloupe. Compared with the blank nanoparticle control group, the coating significantly extended the shelf life of cantaloupe to 16 days. Our results indicate that these nanoparticles have great potential for application in food preservation.

Manipulating electrostatic field to control the distribution of bioactive proteins or polymeric microparticles on planar surfaces for guiding cell migration

We report a general strategy to generate linear and circular gradients of active proteins or polymeric microparticles on planar surfaces by controlling the distribution of electrostatic field during electrohydrodynamic jet printing or electrospray process. Taking fibronectin as an example, we generated a circular gradient of fibronectin and investigated its effect on accelerating the migration of fibroblasts to suit for use in wound closure. In another demonstration, we created linear gradients of laminin in unidirectional and bidirectional patterns, respectively. We showed that such gradations significantly promoted the migration of human neuroblastoma cells with the increase of laminin content. When we changed fibronectin/laminin to electrosprayed poly(lactic-co-glycolic acid) (PLGA) microparticles, we found similar results in terms of guiding cell migration, except that the guidance cues varied from biological signal to topographic structure. Taken together, this method for generating linear/circular gradients of fibronectin/laminin and PLGA microparticles can be readily extended to different types of bioactive proteins and polymeric microparticles to suit wound closure, nerve repair, and related applications involving cell migration.

Fabrication and Characterization of Electrospun Folic Acid/Hybrid Fibers: In Vitro Controlled Release Study and Cytocompatibility Assays.

The fabrication of skin-care products with therapeutic properties has been significant for human health trends. In this study, we developed efficient hydrophilic composite nanofibers (NFs) loaded with the folic acid (FA) by electrospinning and electrospraying processes for tissue engineering or wound healing cosmetic applications. The morphological, chemical and thermal characteristics, in vitro release properties, and cytocompatibility of the resulting composite fibers with the same amount of folic acid were analyzed. The SEM micrographs indicate that the obtained nanofibers were in the nanometer range, with an average fiber diameter of 75–270 nm and a good porosity ratio (34–55%). The TGA curves show that FA inhibits the degradation of the polymer and acts as an antioxidant at high temperatures. More physical interaction between FA and matrices has been shown to occur in the electrospray process than in the electrospinning process. A UV-Vis in vitro study of FA-loaded electrospun fibers for 8 h in artificial acidic (pH 5.44) and alkaline (pH 8.04) sweat solutions exhibited a rapid release of FA-loaded electrospun fibers, showing the effect of polymer matrix–FA interactions and fabrication processes on their release from the nanofibers. PVA-CHi/FA webs have the highest release value, with 95.2% in alkaline media. In acidic media, the highest release (92%) occurred on the PVA-Gel–CHi/sFA sample, and this followed first-order and Korsmeyer–Peppas kinetic models. Further, the L929 cytocompatibility assay results pointed out that all NFs (with/without FA) generated had no cell toxicity; on the contrary, the FA in the fibers facilitates cell growth. Therefore, the nanofibers are a potential candidate material in skin-care and tissue engineering applications.

Lung targeted electrosprayed chitosan nanocomposite microparticles boost the cytotoxic activity of magnolol

Large scale production of therapeutic nanoparticles (NPs) is still challenging. Herein, we report a facile single step electrospray process for the production of a nanocarrier platform made of hybridized chitosan (CS)/ polyvinyl alcohol (PVA) matrix. The method was adapted to achieve the lowest NPs size for carrying and delivering a hydrophobic anti-cancer drug, magnolol (Mag). To improve the inhalation properties of the optimized NPs formulation, the spray drying method was adopted to generate Mag loaded nano embedded-in-microparticles (Mag-NEM). The impact of the characteristics of CS and PVA blended solutions with and without Mag on the developed systems was investigated. The viscosity of the polymers solution played a major role on the size of electrosprayed NPs. NPs could only be obtained at CS:PVA ratio 7:3 and 8:2 for low molecular weight CS and at only 8:2 ratio for the medium molecular weight. Mag-NPs scoring 415.7 nm with a high drug encapsulation efficiency of 95.5% ±2.5 were successfully prepared at 0.1 mL/h flow rate, 15 cm tip to collector distance and 25 kV applied voltage. Optimized Mag-NEM exhibited good aerosolization properties with effective inhalation index of 64.69% and showed a two-fold decrease in IC50 when challenged against lung cancer cells A549.

Design and fabrication of electrospun mixed-matrix multi-layered membranes containing tri-n-octylphosphine oxide for efficient adsorption of p-cresol

In this study, various types of mixed-matrix cellulose triacetate (CTA) fibrous membranes were prepared by a combined electrospinning and electrospraying process, in which tri-n-octylphosphine oxide (TOPO) powders were incorporated on the surface of the fibers to remove uremic toxin p-cresol by adsorption. The morphology, chemical composition (element analysis), and textural properties of the prepared fibrous membranes were first analyzed. The adsorption ability of various fibrous membranes for p-cresol in synthetic serum was then studied in batch experiments at pH 7.4 and 37 °C. It was seen that the loose structure of the electrospun fibrous membranes was beneficial to the rate of adsorption and the position where the TOPO stayed on the fibers played a crucial role in the availability of TOPO and hence the adsorption performance. The maximum adsorption of p-cresol was 6.45 mmol per gram of TOPO, highlighting the adsorption ability of as-prepared mixed-matrix membranes. Moreover, the electrospun TOPO-coated fibers covered with a thin layer of the electrospun CTA fibers largely improved cell viability. The present results have demonstrated the application potential of electrospun/sprayed mixed-matrix fibrous membranes with TOPO for efficient adsorption of p-cresol.

Fabricating an Electrospray Ionization Chip Based on Induced Polarization and Liquid Splitting.

The coupling of the microfluidic chip to mass spectrometry (MS) has attracted considerable attention in the area of chemical and biological analysis. The most commonly used ionization technique in the chip–MS system is electrospray ionization (ESI). Traditional chip-based ESI devices mainly employ direct electrical contact between the electrode and the spray solvent. In this study, a microchip ESI source based on a novel polarization-splitting approach was developed. Specifically, the droplet in the microchannel is first polarized by the electric field and then split into two sub-droplets. In this process, the charge generated by polarization is retained in the liquid, resulting in the generation of two charged droplets with opposite polarities. Finally, when these charged droplets reach the emitter, the electrospray process is initiated and both positive and negative ions are formed from the same solution. Preliminary experimental results indicate that the coupling of this polarization-splitting ESI (PS-ESI) chip with a mass spectrometer enables conventional ESI-MS analysis of various analytes.

Optimisation of alginate-pectin bead formulation using central composite design guided electrospray technique

Alginate-pectin beads act as a carrier in improving the oral bioavailability of bioactive compounds. Electrospray technique facilitates the production of uniform size and shape of alginate-pectin beads. Interaction between key electrospray process parameters affects the size and shape of the beads. A proper model should be employed to establish these correlating interactions. In the present work, the electrospray technique was guided with a central composite design (CCD) and response surface methodology (RSM). One quadratic and one linear model were obtained for size and sphericity coefficient, respectively. The CCD-RSM empirical model derived from the present work is essential to determine the significant factors and their levels in producing beads with consistent size and sphericity coefficient. The results indicated that the applied voltage had the most significant influence on size, while the alginate-pectin concentration was the most prominent factor in producing spherical beads. Spherical beads with a minimum size of 2.97 mm were obtained at an alginate-pectin concentration of 3.5%, a flow rate of 10.0 mL/h, an applied voltage of 2.4 kV, and a distance between the nozzle and the gelation bath of 16.0 cm.

Silica as a Scaffold Layer via Electrospray for MAPbI3 Perovskite-based Solar Cell

We synthesized a novel hybridized perovskite-silica (SiO2) solar cell using an electrospray process under ambient conditions. The Silica scaffold not only provided optical transmission from visible to infrared regions but also blocked the back flow transport of the holes and electrons to reach the electrodes, leading to reduced charge recombination. Moreover, the CH3NH3PbI3 (MAPbI3) film quality can be improved by using the combination of vacuum annealing enhanced crystal growth and the methylamine (CH3NH2, MA) vapor-assisted diffusion at the grain boundaries, due to reduced surface roughness and the re-crystallization of the MAPbI3 film. Photovoltaic performances were evaluated using the glass/ITO/poly (3,4-ethylenedioxythiophene) poly(styrene-sulfonate) (PEDOT:PSS)/SiO2/MAPbI3/C60/BCP/Al device structure, with the champion MAPbI3 based perovskite-silica solar cell exhibited a short-circuit current density of 19.89 mA/cm2, an open-circuit voltage of 0.89 V, a fill factor of 0.50, and a power conversion efficiency of 8.85%.

Electrosprayed Shrimp and Mushroom Nanochitins on Cellulose Tissue for Skin Contact Application.

Cosmetics has recently focused on biobased skin-compatible materials. Materials from natural sources can be used to produce more sustainable skin contact products with enhanced bioactivity. Surface functionalization using natural-based nano/microparticles is thus a subject of study, aimed at better understanding the skin compatibility of many biopolymers also deriving from biowaste. This research investigated electrospray as a method for surface modification of cellulose tissues with chitin nanofibrils (CNs) using two different sources—namely, vegetable (i.e., from fungi), and animal (from crustaceans)—and different solvent systems to obtain a biobased and skin-compatible product. The surface of cellulose tissues was uniformly decorated with electrosprayed CNs. Biological analysis revealed that all treated samples were suitable for skin applications since human dermal keratinocytes (i.e., HaCaT cells) successfully adhered to the processed tissues and were viable after being in contact with released substances in culture media. These results indicate that the use of solvents did not affect the final cytocompatibility due to their effective evaporation during the electrospray process. Such treatments did not also affect the characteristics of cellulose; in addition, they showed promising anti-inflammatory and indirect antimicrobial activity toward dermal keratinocytes in vitro. Specifically, cellulosic substrates decorated with nanochitins from shrimp showed strong immunomodulatory activity by first upregulating then downregulating the pro-inflammatory cytokines, whereas nanochitins from mushrooms displayed an overall anti-inflammatory activity via a slight decrement of the pro-inflammatory cytokines and increment of the anti-inflammatory marker. Electrospray could represent a green method for surface modification of sustainable and biofunctional skincare products.

Facile and Cost-Effective Development of Silver based Cellulosic Wound Dressing using Electrospraying Process

ABSTRACT Silver-based wound dressings are deployed for various types of wounds due to its broad antimicrobial activity. Most of the wound dressings are prepared by exhaustion or doping process, which requires excess quality of silver to be used and also leads to burst release. Electrospraying process provides an excellent opportunity to topically apply silver on cationic cellulosic substrates. The cationization of cellulose ensures better bonding of silver nanoparticles thereby ensuring durability for long periods. The developed wound dressing exhibited excellent antimicrobial activity against E. Coli and S. Aureus.