Static Contact Angle Measurements Research Articles

Comparison of Branched and Linear Perfluoropolyether Chains Functionalization on Hydrophobic, Morphological and Conductive Properties of Multi-Walled Carbon Nanotubes.

The functionalization of multi-walled carbon nanotubes (MW-CNTs) was obtained by generating reactive perfluoropolyether (PFPE) radicals that can covalently bond to MW-CNTs’ surface. Branched and linear PFPE peroxides with equivalent molecular weights of 1275 and 1200 amu, respectively, have been thermally decomposed for the production of PFPE radicals. The functionalization with PFPE chains has changed the wettability of MW-CNTs, which switched their behavior from hydrophilic to super-hydrophobic. The low surface energy properties of PFPEs have been transferred to MW-CNTs surface and branched units with trifluoromethyl groups, CF3, have conferred higher hydrophobicity than linear units. Porosimetry discriminated the effects of PFPE functionalization on meso-porosity and macro-porosity. It has been observed that reactive sites located in MW-CNTs mesopores have been intensively functionalized by branched PFPE peroxide due to its low average molecular weight. Conductivity measurements at different applied pressures have showed that the covalent linkage of PFPE chains, branched as well as linear, weakly modified the electrical conductivity of MW-CNTs. The decomposed portions of PFPE residues, the PFPE chains bonded on carbon nanotubes, and the PFPE fluids obtained by homo-coupling side-reactions were evaluated by mass balances. PFPE-modified MW-CNTs have been characterized by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), static contact angle (SCA), surface area, and porosity measurements.

Modified Lignin with Anionic Surfactant and Its Application in Controlled Release of Avermectin

Alkali lignin (AL), an anionic polymer, is a byproduct of the paper industry. AL was first modified by quaternization to synthesize quaternized alkali lignin (QAL). The aim of the present study is to reveal the effects of sodium dodecyl benzenesulfonate (SDBS) on the microstructure of QAL. The interaction between SDBS and QAL is studied by means of zeta potential, fluorescence spectrophotometer, and static contact angle measurement. The results indicated that there is an electrostatic interaction and a hydrophobic interaction between QAL and SDBS. The SDBS/QAL complex can self-assemble into lignin-based colloidal spheres (LCSs) in an ethanol/water mixture, which have remarkable avermectin (AVM) encapsulation efficiency and antiphotolysis performance. The cumulative release amount of AVM encapsulated by LCS (LCS@AVM) after 72 h was 77%, and the release was still going on. The release behaviors of LCS@AVM can be controlled by adjusting the ratio (w/w) of LCS to AVM. More than 85% of AVM could be preserved even after 96 h of UV irradiation. LCS showed controlled release and UV-blocking performance for AVM.

Preparation of High-Density Polymer Brushes with a Multihelical Structure.

It is well-known that a mixture of isotactic and syndiotactic polymethyl methacrylate (PMMA) forms a stereocomplex consisting of a multihelical structure in which an isotactic chain is surrounded by a syndiotactic chain. Here, we report the basic structure of the stereocomplex formed when the syndiotactic PMMA chains are tethered to a silicon substrate and form a high-density polymer brush. The influence of geometric confinement was investigated by preparing the high-density polymer brushes on a flat and spherical substrate. In both cases, mixing the untethered isotactic PMMA with the grafted syndiotactic PMMA led to the formation of a stereocomplex with a multihelical structure. Static contact angle measurements showed a hindered surface mobility at the outermost surface of the polymer brush, indicating that the stereocomplex forms a crystalline structure. A syndiotactic polymer brush with substituted fluoroalkyl groups was prepared to increase the contrast for grazing incidence wide-angle X-ray diffraction (GIWAXD) measurements. The GIWAXD results verified that the stereocomplex forms a crystalline structure oriented perpendicular to the substrate with a relatively low degree of orientation.

Interfacial and wetting properties between glass fiber and epoxy resins with different pot lifes

Considerable research has been devoted to the study of interfacial adhesion, optimal wetting and interfacial properties of composites. In these studies, epoxy hardeners with different pot lifes were used for the manufacture of composites and their molding processes. Wettability and micromechanical testing revealed that these factors effected wetting, interfacial and mechanical properties. FT-IR studies revealed differences in the spectra with different 'C–N type' curing additives contained in the four different amine-type hardeners. For measurement of impregnation rate, a droplet of the different epoxy/hardener liquids was placed on glass fiber mat and the spreading behavior was measured as a function of time. The surface tension on PTFE was measured using the pendant drop method and the work of adhesion calculated for this surface tension was related to the spreading distance. The Drzal equation, based on the single fiber fragmentation test, was implemented to calculate the interfacial shear strength (IFSS) of the different composite materials. To relate the IFSS, the surface tension and the work of adhesion, static contact angle measurements were made using four solvents of known surface energy. A goal of the study was to identify an optimal epoxy hardener in terms of; pot life degree of curing, residual enthalpy, wettability and interfacial properties. From a practical standpoint the measured rate of resin transfer, and interlaminar shear strength (ILSS), mechanical and other properties were consistently affected by these manufacturing and processing differences.

Investigation of moisture susceptibility of SBS modified asphalt containing Alumina Trihydrate by static contact angle measurements

Although several studies have been carried to discover the asphalt mixture performance when Alumina Trihydrate (ATH) as a flame retardant was added into, the moisture susceptibility of asphalt mixture containing ATH is still not fully clear. In this study, the moisture susceptibility of binders containing ATH were assessed through the surface free energy (SFE) obtained by the sessile drop method. A commonly used SBS modified asphalt with different dosages (0%, 6%, 8%, 10%, 12%, and 14%) of ATH were prepared to determine the physical properties, flame retardancy and SFE parameters. Experimental results indicated that the addition of ATH increased the viscosity, softening point, G*/sinδ and limiting oxygen index, but decreased the penetration and ductility. What's more, increases in total SFE, cohesive energy and work of adhesion were observed with the addition of ATH. Conversely, the work of debonding, wettability and energy ratio decrease due to the addition of ATH. It is concluded that the ATH has a significant negative effect on the moisture-induced damage potential of asphalt mixture from the view of micromechanisms. The recommended percentage of ATH was 6-8% in consideration of physical properties, flame retardation and moisture susceptibility

Effectiveness of commercial anti-graffiti treatments in two granites of different texture and mineralogy

Abstract This paper presents a study of the efficiency of two chemically different anti-graffiti coatings (sacrificial and permanent anti-graffiti products) on two different compositional and textural granitic stones, Rosa Porrino and Albero. First, both uncoated and coated surfaces of the granites were characterized using stereomicroscopy and scanning electron microscopy, static contact angle measurements, colour spectrophotometry and gloss measurements. Results showed that both anti-graffiti products increased the static contact angle of the surfaces. The permanent anti-graffiti made them water-repellent without causing notable colour changes. Second, effectiveness of the anti-graffiti products was evaluated by means of the removal of two different spray graffiti paints (blue and silver colours) on both granites protected with the above-mentioned anti-graffiti products. The cleaning procedures were those recommended by the manufacturers. Fourier Transform Infrared spectroscopy and the previously mentioned techniques were used to assess the cleaning efficiency of the coated surfaces by detecting or not the presence of graffiti remains. As a result, textural differences in the granites, chemical composition of the graffiti paints and removal time were found to be the key parameters controlling the effectiveness of graffiti removal. On Albero granite, more residues of paint were found in its fissure system. Blue graffiti based on alkyd and polyester resins was more readily removed than silver paint. In general terms, graffiti extraction was more effective 30 days after painting than 3 days after.

PH and Surface Charge Switchability on Bifunctional Charge Gradients.

Multifunctionalized pH-sensitive silica gradients containing acidic and basic functional groups have been prepared to evaluate how the spatial arrangement of active sites on a surface influences the surface charge and pH switchability. The gradient surfaces were prepared using controlled rate infusion in such a manner that the individual gradients in the strong acid (sulfonic acid) and in the weak base (propylamine) align, whereas a gradient in the weakly acidic silanol groups opposes them. The relative amounts of the three species were varied by controlling the composition of the deposition solution, whereas the hydrophobicity of the underlying surface was set by using base layer-coated substrates prepared from either tetramethoxysilane or tetramethoxysilane/octyltrimethoxysilane mixtures. Results from X-ray photoelectron spectroscopy confirm that aligned gradients are formed in both amine and sulfonic acid groups, and the relative amounts bound to the surface follow that expected from the solution composition. Water contact angle measurements show a 40°-50° change across the length of the gradient, the exact values being dependent on the hydrophobicity of the base layer. Zeta potential measurements on gradient mimics reveal that there is a pH where the net charge on the gradient surface is predicted to have a constant but nonzero value. Static contact angle measurements and modeling confirm this prediction. At a pH acidic of this value, the gradient in charge runs in one direction, whereas at a pH basic of this value, the gradient in charge runs in the other direction. This point can be strategically moved from acidic values to basic values by changing the relative amounts of acidic and basic functionalities on the surface. The origin of this unique pH switchability can be found in acid-base chemistry. By modeling the charge along the gradient surface using a simple equilibrium model, a distribution of pKa values were noted in these materials.

Zwitterionic molecule layer for inhibiting microbial corrosion of copper alloy

PurposeFor mitigating biocorrosion induced by sulfate-reducing bacteria (SRB) in seawater, the zwitterionic molecule layer (ZML) of poly (sulfobetaine methacrylate) is grafted onto B10 surface by chemical vapor deposition and surface-initiated atom transfer radical polymerization.Design/methodology/approachEnergy-dispersive spectroscopy-attenuated total reflectance Fourier transform infrared spectroscopy and static contact angle measurements are used to characterize the as-formed layer.FindingsAfter surface modification, B10 can significantly reduce SRB adhesion, demonstrating the good antifouling property. Further, the biocorrosion inhibition is investigated by potentiodynamic polarization and electrochemical impedance spectroscopy, indicating that ZML exhibits high resistance to biocorrosion with inhibition efficiency of approximately 90 per cent.Originality/valueZML performs a dual feature, i.e. antifouling film and corrosion inhibitor, for the biocorrosion inhibition.

The evolution in graphitic surface wettability with first-principles quantum simulations: the counterintuitive role of water.

The surface wettability of graphite has gained a lot of interest in nanotechnology and fundamental studies alike, but the types of adsorptions that dominate its time resolved surface property variations in ambient environment are still elusive. Prediction of the intrinsic surface wettability of graphite from first-principles simulations offers an opportunity to clarify the overall evolution. In this study, by combining experimental temporal Fourier transform infrared spectroscopy, atomic force microscopy (AFM), and static contact angle measurements with density functional theory (DFT)-predicted contact angles and DFT AFM force simulations, we provide conclusive evidence to demonstrate the role played by water adsorption in the evolution of surface properties of aged graphite in ambient air. Moreover, this study has the merit of linking DFT-predicted adhesive energy at the solid/liquid interface and cohesive energy at the liquid/liquid interface with the DFT AFM-predicted force of adhesion through the Young-Dupre equation. This establishes the basis of the quantum surface wettability theory by combining two independent atomic-level quantum physics simulation methodologies.

The influence of the SO2 ageing on the graffiti cleaning effectiveness with chemical procedures on a granite substrate

Graffiti are one of the most severe threats to Stone Cultural Heritage and are most of the times removed after long periods of environmental exposure. This research intends to evaluate the influence of the ageing of the graffitis on the effectiveness of their cleaning. So, comparative studies on unaged and on artificially SO2 aged samples were conducted. Four graffiti spray colours were applied on a granite stone and cleaned with two chemical commercial cleaners: a solution of KOH and a solution of n-butyl acetate, xylene and alcohol isobutyl. The spray paints (unaged and aged) and cleaning effectiveness were characterized by stereomicroscopy, colour spectrophotometry, adhesion tests, SEM, μEDXRF, XRD and FTIR. The cleaning effectiveness was also evaluated through surface roughness and static contact angle measurements. The alkyd graffiti paints presented greatest resistance under SO2 rich environments than the polyethylene paint. The aged polyethylene paint showed chemical modifications that resulted in graffiti losses and neo formed mineralogical phases in the surface of the paint. After ageing, the paints became more difficult to clean, showed higher global colour changes and higher residue percentages. No significant roughness variations were detected after chemical cleaning. After the cleaning procedures aged surfaces became more water repellent comparatively to unaged and reference samples. The best cleaning effectiveness was mainly achieved with the potassium hydroxide solution.

Improving the antifouling properties of polypropylene surfaces by melt blending with polyethylene glycol diblock copolymers

ABSTRACTProtein‐resistant polyethylene‐block‐poly(ethylene glycol) (PE‐b‐PEG) copolymers of different molecular weights at various concentrations were compounded by melt blending with polypropylene (PP) polymers in order to enhance their antifouling properties. Phase separation of the PE‐b‐PEG copolymer and its migration to the surface of the PP blend, was confirmed by attenuated total reflectance–Fourier transform infrared, X‐ray photoelectron spectroscopy, and static water contact angle measurements. Enrichment of PEG chains at the surface of the blends increased with increasing PE‐b‐PEG copolymer concentration and molecular weight. The PP blends compounded with PE‐b‐PEG copolymer having the lowest molecular weight (875 g mol−1), at the lowest concentration (1 wt %), gave the lowest bovine serum protein adsorption (30% less) compared to that of neat PP. At higher concentrations (5 and 10 wt %), and higher molecular weights (920, 1400, and 2250 g mol−1), the PE‐b‐PEG copolymers leached‐out resulting in protein adsorption comparable to that of neat PP. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46122.

Carbon dots-modified chitosan based electrochemical biosensing platform for detection of vitamin D

Here in, a carbon dots (CDs)-modified chitosan (CH) based biosensing platform was fabricated for vitamin D2 detection. Carbon dots were synthesized through microwave pyrolysis method, and characterized with transmission electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, and UV/VIS spectroscopy. Chitosan (1%) solution was prepared in acetic acid (1%) solution and followed by the addition of CDs to prepare the carbon dots-chitosan (CD-CH) composite. A thin film of CD-CH composite was prepared onto ITO glass substrate (CD-CH/ITO) by drop casting method. Surface of the composite film was characterized by atomic force microscopy, static contact angle measurement and cyclic voltammetry. CD-CH/ITO surface was further modified with immobilization of vitamin D2 antibody (Ab-VD2) and bovine serum albumin (BSA) to prepare BSA/Ab-VD2/CD-CH/ITO bioelectrode. Electrochemical response of the bioelectrode towards vitamin D2 antigen (Ag-VD2) was carried out by differential pulse voltammetry. The biosensing electrode showed linearity within the range 10–50 ng mL−1 of Ag-VD2 concentration. The sensitivity was found to be 0.2 μA ng−1 mL cm−2, LOD was 1.35 ng mL−1, and the biosensor had a shelf-life of about 25 days.

Facile fabrication of uniform hierarchical structured (UHS) nanocomposite surface with high water repellency and self-cleaning properties

In the present study, two-stage process for the fabrication of superhydrophobic Ni-Cu-TiO2 nanocomposite coatings on the copper substrate has been introduced. Surface modification was performed on the electrodeposited coatings by myristic acid-ethanol solution to achieve superhydrophobicity. Additionally, in order to further study the roughness effect, instead of addition of copper ions in electrodeposition bath, three substrates were roughened by electrochemical etching method. Water repellency properties were studied through measurement of static and dynamic contact angles, and performing bouncing test, self-cleaning and water-jet evaluation. The samples were electrodeposited in various current densities, and the highest corrosion resistance and water repellency properties were obtained for the sample which was electrodeposited in two consecutive steps and modified by a fatty acid called myristic acid (which significantly reduces surface energy of the coating). The highest water contact angle (161°) and the lowest contact angle hysteresis (3°) were obtained for the sample which was coated by 10 mA/cm2 (144 min) and 20 mA/cm2 (18 min), respectively. Since this approach does not require any sophisticated equipment and materials, it shows promising future in the fabrication of superhydrophobic coatings.

Direct Measurement of Static and Dynamic Contact Angles Using a Random Micromodel Considering Geological CO2 Sequestration

The pore-level two-phase fluids flow mechanism needs to be understood for geological CO2 sequestration as a solution to mitigate anthropogenic emission of carbon dioxide. Capillary pressure at the interface of water–CO2 influences CO2 injectability, capacity, and safety of the storage system. Wettability usually measured by contact angle is always a major uncertainty source among important parameters affecting capillary pressure. The contact angle is mostly determined on a flat surface as a representative of the rock surface. However, a simple and precise method for determining in situ contact angle at pore-scale is needed to simulate fluids flow in porous media. Recent progresses in X-ray tomography technique has provided a robust way to measure in situ contact angle of rocks. However, slow imaging and complicated image processing make it impossible to measure dynamic contact angle. In the present paper, a series of static and dynamic contact angles as well as contact angles on flat surface were measured inside a micromodel with random pattern of channels under high pressure condition. Our results showed a wide range of pore-scale contact angles, implying complexity of the pore-scale contact angle even in a highly smooth and chemically homogenous glass micromodel. Receding contact angle (RCA) showed more reproducibility compared to advancing contact angle (ACA) and static contact angle (SCA) for repeating tests and during both drainage and imbibition. With decreasing pore size, RCA was increased. The hysteresis of the dynamic contact angle (ACA–RCA) was higher at pressure of one megapascal in comparison with that at eight megapascals. The CO2 bubble had higher mobility at higher depths due to lower hysteresis which is unfavorable. CO2 bubbles resting on the flat surface of the micromodel channel showed a wide range of contact angles. They were much higher than reported contact angle values observed with sessile drop or captive bubble tests on a flat plate of glass in previous reports. This implies that more precaution is required when estimating capillary pressure and leakage risk.

Catalytic microreactor with electrodeposited hierarchically nanostructured nickel coatings for gas-phase fluorination reactions

The fabrication of a catalytic microreactor for the reaction of undiluted carbonyl difluoride and elemental fluorine to synthesize trifluoromethyl hypofluorite, CF3OF, on CsF catalyst supported on F2-passivated nanosctructured Ni coating was studied. The nanosctructured Ni support for catalyst immobilization was electrodeposited by a two-step procedure, consisting of a low current density step followed by a brief high current density one, for a hierarchical differentiation of structural features. An aqueous solution of NiCl2 with diethanolamine, as crystal modifier, and sodium lauryl sulphate, as anti-pitting agent, was used as electrolyte. Constant-pH Ni electrocrystallization was performed on H2SO4-etched Cu substrates in a range of pH from 1 to 4 via a HCl/H3BO3 based buffer. Passivation was carried out under up to 300mbar of undiluted F2. XRD, XPS, SEM, AFM, and static contact angle measurements were performed. Ni coatings obtained from pH 3 electrolytes were selected for microreactor fabrication on the basis of characterization data, due to the reproducibility and homogeneity of the structured Ni layers. The catalytic microreactor allowed the quantitative production of CF3OF from pure reactants, on demand, and removing any criticality relative to thermal and safety control of the synthesis. The CF3O-group selective transfer ability of the synthetized hypofluorite has raised interest in pharmaceutical and agrochemical industries in recent years.

Sulphonated polystyrene-b-poly(4-vinylpyridine) with nanostructures induced by phase separation as promising humidity sensitive material

Nanostructured humidity sensors have been facilely prepared by solvent annealing of polystyrene-b-poly(4-vinylpyridine) deposited on interdigitated gold electrodes and subsequent sulphonation. The structure, composition, morphology and hydrophilicity of the block copolymer (BCP) have been characterized by gel-permeation chromatography, 1H NMR, FT-IR, elemental analysis, scanning electron microscopy and static water contact angle measurements. Phase separation of the BCP film induced by annealing in CHCl3 vapor and hot ethanol resulted in its fishnet-like porous nanostructure. Humidity sensing properties of the nanostructured BCP based sensor have been examined at room temperature, and the sensing mechanism was examined. Both concentration of polymer solution for film preparation, and the sulphonation duration seriously affected the sensing properties of the BCP based sensor. Under optimal conditions, the BCP based sensor demonstrated high response magnitude towards relative humidity (RH) (impedance change of three orders of magnitude in the range of 40–90%RH). Moreover, it was featured with quick response (t90% of 10s and 13s for humidification and desiccation, respectively), good sensing repeatability and relatively small hysteresis (∼5%RH), which is attributed to its special nanostructure. The desirable sensing performance suggests the potentials of the BCP with phase separation-induced nanostructures as high performance humidity sensing material.

Epigallocatechin-3-gallate enhance dentin biomodification and bond stability of an etch-and-rinse adhesive system

ObjectivesTo evaluate the effect of epigallocatechin gallate (EGCG) on hydrophobicity, thermal stability of dentin collagen, and the influence of EGCG preconditioning on resin-dentin bonds. MethodsCoronal dentin specimens were sectioned to 0.7mm or 2.5mm from the dental pulp horn to simulate deep and shallow dentin. Static contact angle measurements on 0.005%, 0.02%, 0.1%, 0.5%EGCG preconditioned demineralized dentin were performed by contact angle analyzer. The collagen thermal denaturation temperature was determined by differential scanning calorimetry (DSC) analysis. Resin-bonded specimens with/without EGCG preconditioning as well as thermocycling were created for microtensile bond strength evaluation. Confocal laser microscopy (CLSM) was used to evaluate the ultra-morphology and micropermeability of the resin-dentin interface after thermocycling. ResultsContact angle of demineralized dentin substrate increased after 0.02%/0.1%/0.5%EGCG preconditioning. Statistical analysis revealed that the effect of EGCG on shallow dentin was more evident than on deep dentin. The results of DSC demonstrated that 0.1%/0.5%EGCG strengthened collagen's resistance to thermal denaturing. 0.1%EGCG preconditioning group showed highest bond strength after thermocyling aging and exhibited least nanoleakage under CLSM examination. 0.5%EGCG preconditioning resulted in thinner hybrid layers. Meanwhile, bonding interface presented more nanoleakage in 0.5%EGCG group than in 0.1% EGCG preconditioning group. Conclusions0.1%EGCG preconditioning improved the hydrophobicity of dentin substrate and thermal stability of dentin collagen, which could reduce nanoleakage and enhance resin-dentin bond durability.

High flux nanofiltration membranes based on layer-by-layer assembly modified electrospun nanofibrous substrate

Herein, high flux nanofiltration (NF) membranes were fabricated by combined procedures of electrospinning, layer-by-layer (LBL) assembly, and phase inversion. The membranes displayed three-dual structure constituted polyether sulfone (PES) coating layer, LBL assembly modified electrospun polyester (PET) nanofibrous mats, and non-woven supports. High flux NF membranes thus prepared are characterized by ultrathin phase inversion layer (∼10μm) while that of conventional membranes are 100–150μm, implying that very high flux could be expected. Various factors including electrospinning conditions, chitosan (CHI)/alginate (ALG) concentration, PES concentration, exposed time, coagulating temperature, thermal treatment, and sulfonated poly ether ketone (SPEEK) content were systematically investigated. Structures of the membranes were characterized by field emission scanning electron microscopy (FESEM), mechanical properties test, Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR) and static contact angle measurements. The separation experiments indicated that thus prepared membranes exhibited high flux of as high as ∼75Lm−2h−1 with Mg SO4 rejection of ∼80%.

UV resistant transparent bionanocomposite films based on potato starch/cellulose for sustainable packaging

Biobased polymers are considered as a promising alternative to conventional synthetic plastics from fossil fuels to recompense the draining resources for petroleum‐based products, which addresses several environmental issues. Here, briefly, cellulose nanofibers were isolated from pineapple leaves and the quality of the prepared nanofibers was characterized using advanced instrumental technologies. Poor mechanical properties, barrier properties, and the hygroscopic nature are notable issues that reduce the shelf life of starch‐based films, which can be rectified by the addition of nanoscale fillers. The impact of filler reinforcement on the films was investigated in different aspects. Morphology, UV shielding, wettability, and thermal degradation were carefully analyzed using polarized optical microscopy, UV–vis spectroscopy, static water contact angle measurements, and thermal gravimetric analysis, respectively. The water contact angle increases from neat TPS to nanocomposites with 3 wt% of CNF (41.250 to 51.770) and the water vapor permeability decreases from 7.32 to 5.68 × 10−2 g min−1 m−2 for 3 wt% CNF loading. Also, several enhanced properties were observed for the final product quality with respect to the reference sample, including that the potato starch/cellulose nanocomposite films were found to be UV resistant, and that higher transparency indicates the nanoscale dispersion. Further studies are anticipated to develop the materials on an industrial scale.

Wettability alteration of reservoir rocks to gas wetting condition: A comparative study

AbstractProductivity of gas condensate reservoirs reduces significantly due to the near wellbore condensate/water blockage phenomenon. A novel, permanent solution to alleviate this problem is near wellbore wettability alteration of reservoir rocks to preferentially gas wetting conditions; industrial chemical materials are good candidates for this purpose, because of their eco‐friendly characteristics, economical price, and mass production. In this paper, a comparative study is conducted on two industrial fluorinated chemicals, MariSeal 800 and SurfaPore M. Static and dynamic contact angle measurements, spontaneous imbibition, and core flooding tests were conducted to investigate the effect of utilized chemical agents on surface wetting behaviour and fluid flow characteristics of rock samples. Contact angle measurements demonstrate that the liquid phase is changed to a non‐wetting phase after chemical treatment and MariSeal 800 has a greater potential to decrease the surface free energy of the calcite surface. Although both chemicals reveal great potential in static contact angle measurements, further experiments were conducted to distinguish between their abilities. Spontaneous air liquid imbibition tests and endpoint relative permeability measurements approved the potential of utilized chemicals to improve liquid phase mobility and decrease critical condensate saturation, which improve production parameters and reservoir productivity. Liquid phase endpoint relative permeabilities of sandstone core samples were improved by factors of 1.74 and 2.62; furthermore, irreducible liquid phase saturations were decreased by factors of 0.68 and 0.5 using MariSeal 800 and SurfaPore M chemicals. The results of this research help efficient selection of chemical agents for further field applications.