Paraffin Surface Research Articles

Section thickness is identical for the sliding microtome and rotary microtome under the continuous cooling device condition

To date, no report has compared section thickness (ST) between the sliding microtome (SM) and rotary microtome (RM). We used the ice pack (IP) condition, in which the paraffin block was not cooled during slicing, and a continuous cooling device (CCD) for continuous cooling during slicing. The ST was greater for the SM than the RM in the IP condition, but it was identical between the devices under the CCD condition. Thus, we used the CCD condition for subsequent studies. In formalin-fixed, paraffin-embedded (FFPE) fish sausage blocks, the ST of the tissue surface (T-surface) was significantly concaved compared to that of the paraffin surface (P-surface) for both microtomes. On the contrary, in FFPE human kidney blocks, ST did not differ between the T-surface and P-surface. Furthermore, the eosin-positive area of PAM-stained specimens was affected by ST, and the color tone of the thickest sample differed from that of the median or thinnest sample. Our data indicated that we should use CCD conditions to ensure that ST is uniform regardless of the type of microtome. In addition, for quantitative analysis, we should utilize ST measure equipment and specimens with a constant ST.

Studying the paraffin based mixtures regression under high speed hot air blowing

Hybrid and ramjet engines became now effective propulsion systems with great development potential in different fields. They require using proper high-energy components. At high-speed blowing conditions conventional polymer fuels exhibit relatively low regression rate. As an alternative, it is proposed to use paraffin and based on it compositions. Paraffin is high-energy hydrocarbon with a low melting point leading to a high regression rate in high-speed blowing conditions. The results of experimental study of regression behavior of paraffin mixtures with various additives under intensive hot air blowing at 1 MPa pressure are presented. Stearic acid, nanoaluminum Alex, aluminum hydride AlH3, B and mechanoactivated aluminum boride AlB2 were used as 10 % by mass additives. Experiments were conducted on cylindrical perforated samples. Using original design microwave gauge the current diameter of a sample bore was measured during experiment with subsequent calculation of regression rate. Based on experimental data and the results of heat balance calculation, the temperature on the gasified surface of paraffin fuel was estimated.

ПОВЕРХНОСТНО-АКТИВНЫЕ СВОЙСТВА АЛКАНОЛАМИДОВ

The indicators of the wetting ability of surfaces with aqueous solutions of the studied alkanolamides based on distilled fatty acids of rapeseed (DKRMA) and sunflower (DKPMA) oils were studied and monoethanolamide. The sizes of surfactant components were diagnosed using high-precision instruments: a DataPhysics DCAT 21 tensiometer and a 90Plus/BI-MAS particle size analyzer. The contact angles of wetting of glass (hydrophilic) and paraffin (hydrophobic) surfaces with DCPMA solutions at concentrations above the critical micelle concentration (CMC) (1.5-2.0 g/dm3) reached values of 33.0-34.0º. For DKRMA, the contact angles were 34.0-35.0º for the glass surface and 36.0-37.0º for the paraffin surface. It was found that before CMC (at a surfactant concentration of 0.5-1.0 g/dm3), the hydrodynamic radii of the components are in the range of 120.7 - 121.1 nm. Outside the CMC, the hydrodynamic radii of particles of surfactant micelles reach values of 221.3 - 221.6 nm. It was revealed that the synthesized alkanolamides belonged to the category of monodisperse systems according to the fractional composition of the particles of the dispersed phase. The latter is regulated by the uniformity of dispersed particle sizes. The latter is regulated by the uniformity of dispersed particle sizes. Depending on the average size of dispersed particles, the surfactants under study are highly dispersed systems (divided by particle size of the dispersed phase). The surfactants under study are highly dispersed systems, in accordance with the classification by particle size of the dispersed phase depending on the average size of the dispersed particles. It has been proven that the products take an intermediate position between nano- and microparticles. The cloud point temperature (81-83ºС) was measured and the hydrophilic-lipophilic balance (HLB) (11.8-11.9) of the surfactants under study was calculated. The obtained HLB values mean that alkanolamides belong to the group of “oil in water” emulsions. The pH of aqueous solutions of surfactants at a concentration of 10.0 g/dm3 was 7-8. Neonol AF 9-12 was used as a control surfactant.

Paraffin@hBN Phase‐Change Thermal Conductive Composite: Preparation and Properties

AbstractAs a typical organic phase change material, paraffin occupies the large phase‐transition latent heat, promising electronic insulation, excellent cycling and chemical stability as well as the low corrosivity, which is attractive in the thermal management. In the practical applications, the surface of paraffin should be protected by organic or inorganic layers to inhibit the leakage above the melting point. However, in the reported paraffin composites, the weak cycling stability and the low thermal conductivity restricts their applications. In this paper, the highly thermal conductive hexagonal boron nitride nanosheets (hBNNS) are used as the protective layer for wrapping the paraffin in a microemulsion method to form the hBN‐paraffin thermal management composite, which exhibits the large phase‐transition latent heat ~189 J g−1, the excellent cycling stability over 20 cycles and the high thermal conductivity ~1.2 W m−1 K−1. The developed paraffin@ hBN composite should be promising for the thermal management in electronic packing, and can be used to improve the reliability of electric devices.

Effect of adjuvants on physicochemical properties of lime sulfur on flower/paraffin and application on flower thinning.

Adjuvants can effectively enhance the utilization rate of pesticides, but the application of adjuvants in plant growth regulators is rarely studied. This work explored the effects of adjuvants dioctyl sulfosuccinate sodium salt (AOT) and methyl oleate (MO) on lime sulfur (LS), especially the drop behavior on flower and paraffin surface. The results showed that the addition of AOT and AOT+MO can significantly reduce the static and dynamic surface tension of LS from 72mN/m to 28mN/m and 32mN/m respectively, and increase the spreading factor from 0.18 to 1.83 and 3.10 respectively, reduce the bounce factor from 2.72 to 0.37 and 0.27 respectively. The fluorescence tracer test showed that the addition of adjuvants could promote the spreading and permeation of droplets. The field test results revealed that the flower thinning rate of adjuvant and non-adjuvant were 80.55% and 54.4% respectively, and the flower thinning effect of adding adjuvant was the same as that of artificial which the flower thinning rate was 84.77%. The quality of apples treated with adjuvants was similar to that treated with artificial, and the weight of single fruit increased by 24.08% compared with CK (spray water). The application of tank-mixture adjuvant could reduce the dosage of LS for thinning agent application, improve apple's quality, and decrease labor cost and improve the economic benefits of fruit planting and the environmental benefits of plant growth regulators.

Regulation of thermal conductivity of microencapsulated phase change materials via atomic layer deposition

Microencapsulated phase change materials (MEPCMs) have different thermal conductivity requirements under various application conditions. Organic-shell MEPCMs currently dominate the microcapsule due to their easy availability. The aim of this paper is to regulate the thermal properties, especially the thermal conductivity, of organic-shell microcapsules. Herein, with the precision and uniformity of atomic layer deposition (ALD) coating, the thickness of ZnO coating is controlled on the surface of paraffin @ polymethyl methacrylate (PMMA) to realize the regulation of thermal properties of MEPCMs. The experimental results illustrate that the introduction of ALD ZnO shell abates the phase transition enthalpy of MEPCM, but it realizes the optimization of thermal stability and phase transition reversibility for MEPCMs, which is confirmed by the mechanical test results of microcapsules. Furthermore, it is particularly worth mentioning that the thermal conductivity of MEPCM can be adjusted from 0.16 to 1.99 W m−1 K−1 within the ALD cycle range given in this research. The equivalent thermal conductivity of MEPCM was verified by calculation, and the relationship between ALD treatment and thermal conductivity was obtained. This research provides a strategy for accurately regulating the thermal conductivity of phase change microcapsules, breaking through the bottleneck in the application of microcapsules.

A novel multilayer composite structure based battery thermal management system

The battery thermal management system (BTMS) utilizing phase change materials (PCM) has shown promising performance in high heat flux heat dissipation. However, conventional PCM systems do not fully exploit the latent thermal properties of paraffin wax to enhance battery cooling efficiency. To address this issue, this paper proposes a novel multilayer composite material for BTMS, aiming to improve the thermal performance of the battery and overcome the low thermal conductivity of paraffin wax. The preparation process involves positioning the battery at the center of a triangular container, melting paraffin wax and pouring it into a 100 mm high container to form a 20 mm paraffin layer, placing copper foils and graphite layers on the paraffin surface, and repeating this step once. Finally, pour the 40 mm paraffin wax into the container, resulting in a sandwich-like structure with two layers of graphite. The cooling performance of the multilayer composite structure was experimentally tested at different ambient temperatures (15°C and 20°C) and discharge rates, and compared with a conventional BTMS based on pure paraffin wax. The results demonstrate that the multilayer composite structure exhibits superior heat dissipation compared to the pure paraffin structure, significantly reducing battery temperature rise, particularly at higher discharge rates. At an ambient temperature of 20°C and a discharge rate of 5°C, the battery temperature rise is only 14.97°C, with a remarkable cooling effect of 32.6%. Moreover, optimization of the number and thickness of graphite layers in the composite structure reveals that the 6-layer graphite structure outperforms the 2-layer, 4-layer, 8-layer, and 10-layer graphite structures. Additionally, a relatively lower battery surface temperature is observed with a graphite thickness of 0.5 mm on the basis of the 6-layer graphite structure. These findings indicate that the proposed novel layout structure exhibits excellent thermal performance, effectively addressing the low thermal conductivity limitation of traditional paraffin cooling systems, and providing a new approach for thermal management of lithium batteries.

Paraffin@Silica Microencapsulated Phase Change Materials with Improved Anti‐Leakage Properties

AbstractA series of paraffin (Pn)@silica (SiO2) microencapsulated phase change materials (MEPCM) were synthesized by sol‐gel process using tetraethyl orthosilicate (TEOS) and silane coupling agent as precursors. The morphology and chemical compositions of Pn@SiO2 microcapsules were characterized by SEM and FT‐IR, and thermal energy storage capacity was tested by DSC. The results showed that the Pn@SiO2 microcapsules modified with 3‐methacryloxypropyltrimethoxysilane (MPS) had a desirable phase transition enthalpy (184.12 J/g). Meanwhile, the contact angle and leakage rate of Pn@SiO2 microcapsules were analyzed, and the data indicated the contact angle of Pn@SiO2 microcapsules was significantly improved and the leakage rate of Pn@SiO2 microcapsules was reduced to different degrees by modification with silane coupling agents. The main reason is that the modification of silane coupling agents improves the wettability of silica on the surface of paraffin wax, which makes the aggregation of silica on the surface of paraffin more efficient. Among them, the Pn@SiO2 microcapsules modified by MPS showed the most significant reduction in leakage rate, which was reduced from 8.38 % to 1.24 %. Pn@SiO2 microcapsules modified by MPS not only showed outstanding latent heat‐storage/release capability with a high capacity but also exhibited good shape stability, high thermal stability and excellent phase‐change reliability and durability.

Electrochemical behavior of chromium carbide MXene modified electrodes: Hydrazine sensing

Electrochemical characteristics of few-layered two dimensional chromium carbide MXene (FL-Cr2CTx) modified electrode towards the detection of hydrazine (HZ) is reported for the first time in this paper. The modified electrode was fabricated using binder-free and mechanically immobilized FL-Cr2CTx onto the surface of paraffin impregnated graphite electrode. Electrochemical behavior of modified electrode was investigated by cyclic voltammetric studies and the effect of supporting electrolytes, scan rate and stability was also examined. The modified electrode exhibited multiple quasi-reversible peaks with three reduction peaks at − 0.39 V, − 0.88 V and − 1.20 V and two oxidation peaks at − 0.56 V and 0 V respectively, corresponding to surface oxy and hydroxyl groups in FL-Cr2CTx and due to the variable oxidation states of chromium as well. The electrode was utilized for electrochemical sensing of HZ, which exhibited a high sensitivity of 1.810 ± 0.013 µA µM−1 with a detection limit of 6.60 × 10−7 M (at S/N = 3). The developed sensor was further used for quantitatively analyzing HZ liquid propellant spiked in water, as a part of real sample analysis and the results were found satisfactory. The plausible mechanism suggests that the surface adsorption/desorption redox process of Cr2COx/Cr2COxH2 is responsible for the detection of HZ.

Moisture-regulating microcapsule and its enhanced water vapor permeability of leather polyurethane coating

A type of porous shell moisture-regulating microcapsules (MRM), was successfully prepared by self-assembly of chitosanand graphene oxide onto the surface of paraffin, followed by chemical precipitation of SiO2). The MRM was used to enhance the water vapor permeability (WVP) of polyurethane (PU) composite coating. The composite PU coating was facilely fabricated by mixing PU emulsion with the prepared MRM and applied in leather coating. The SEM and AFM of composite PU films confirmed that the MRM in PU increased the roughness of the composite films, enhancing the water contact angle. As a result, the WVP of the composite PU coating was effectively improved by MRM and exhibited a good balance between WVP and water resistance, maintaining the transparency and mechanical properties of the films. After the composite PU coating was coated on leather surface, the leather showed an improvement of WVP with slight increase in water resistance, indicating that the composite PU coating with MRM can be a promising candidate to improve the comfort of leather.

Multi-objective optimization of acetone droplet impingement on phase change material in direct-contact discharge method

Improving the discharge process of phase change materials (PCMs) is of great importance and can be effective for thermal energy storage (TES) systems. In this research, the direct-contact method for acetone droplet on molten paraffin is optimized to enhance the efficiency of the discharge process of PCMs and TES systems working with intermediate boiling fluid (IBF). In order to improve the storage rate and increase the freezing rate in the system, the NSGA-II algorithm is used. When the acetone droplet hits, owing to its low boiling point relative to the temperature of molten paraffin, the acetone evaporates, causing the creation of solidified paraffin area. The main goal of the current investigation is to maximize the solid volume, which depends on two parameters: the Weber acetone droplet and the temperature of the molten paraffin. Furthermore, maximizing this volume is equivalent to increasing the freezing rate and decreasing the melting rate. For better discernibility, the relative sensitivities of solidified paraffin area and maximum crater depth to the variations in the dimensionless parameters of paraffin surface temperature and Weber number are obtained. In this regard, the experimental results are fitted by exponential functions. Two-objective optimization with the solidified paraffin area and maximum crater depth as cost functions are performed to be maximized. Moreover, uncertainties and tolerances are considered through performing a robust triple optimization. By using final decision makings (FDMs), the results are achieved from Pareto front through two methods, LINMAP (We = 1699.428, θ = 1.188) and TOPSIS (We = 1699.325, θ = 1.202). Based on the results, the solidified paraffin areas obtained by LINMAP and TOPSIS methods are 168.616 mm2 and 155.101 mm2, respectively.

Measurement of the temperature dependence of dwell time and spin relaxation probability of Rb atoms on paraffin surfaces using a beam-scattering method

The scattering of Rb atoms on an anti-relaxation coating was studied. No significant change in the spin relaxation probability of Rb atoms by single scattering from a tetracontane surface was observed by cooling the film from 305 to 123 K. The mean surface dwell time was estimated using a time-resolved method.Delay-time spectra, from which mean surface dwell times can be estimated, were measured at 305, 153, and 123 K, with a time window of $9.3\times 10^{-5}$ s. The increase in mean surface dwell time with cooling from 305 to 123 K was smaller than $4.4\times 10^{-6}$ s, which is significantly smaller than the value expected from the mean dwell time at room temperature measured using the Larmor frequency shift. These results can be explained by assuming a small number of scattering components, with a mean surface dwell time at least three orders of magnitude longer than the majority component.

Assemblies disaggregation and diffusion dictated droplet impact and wetting behaviors on hydrophobic surface

Improving the liquid deposition on plant leaves is crucial during pesticide spraying. However, the hydrophobicity of most plant leaf surfaces makes the droplet splash or run off, finally reducing the efficacy of the foliar-applied pesticide. Though some molecular additives have been employed to regulate the above process, the understanding about the mechanism and the effect of molecular structure is still limited. Herein, cationic surfactants with different double-chain lengths (8–14) are adopted to regulate the droplet impact and wetting on hydrophobic paraffin surface (simulating leaves). With the surfactant chains extending, the capacity for restraining retraction and promoting wetting increases firstly, and then decreases. It can be attributed to that the surfactant with shortest chain cannot form assemblies to inhibit retraction, as the chain length increases, the small-sized micelles reduce but the vesicles become larger and firmer thus the self-assemblies scarcely disaggregate to replenish the monomer at interface during impact. Likewise, short-chain surfactant diffuses faster to interface than long-chain surfactant due to the size effect and hydrophilic/hydrophobic ratio. Our work not only elucidates the mechanism of droplet impact and wetting dynamics by tuning the assemblies aggregation and surfactant diffusion but also promotes the promising application of surfactant in pesticide spraying.

The impingement of liquid boiling droplet onto a molten phase change material as a direct-contact solidification method

The boiling of a fluid dripping on the surface of molten phase-change materials provides an efficient means for heat exchange or cooling of the melt. For the first time, in this study, the impact of acetone drops onto molten paraffin as a direct-contact solidification method is experimentally investigated to get a better insight into the interaction between the drop boiling and the heat extraction process from the phase change materials during impact. As the acetone drop impacts the molten paraffin surface, acetone starts to boil, and a portion of molten paraffin is solidified. Four impact Weber numbers (corresponding to heights of 10, 20, 30, and 40 cm) for the acetone drop and six surface temperatures for the molten paraffin (66, 68, 70, 75, 80, and 90 °C) are considered. Given the range of these two parameters, four distinct regimes of impact were observed using a high-speed camera and categorized, including the formation of the crater, crown, returned liquid paraffin column (jet), and the drop pinching off from the jet tip. Moreover, as We increased or the paraffin surface temperature decreased, the solidified paraffin’s on the molten surface grew. A correlation was obtained based on the impact Weber number and surface temperature of molten paraffin to determine the spread of solidified paraffin area on the melt free surface after drop impact. Results also showed that both the maximum crater depth and width increase with the increment of both the molten paraffin temperature and the impact Weber number.

What is Essential is (No More) Invisible to the Eyes: The Introduction of BlocDoc in the Digital Pathology Workflow

Background: The implementation of a fully digital workflow in any anatomic pathology department requires a complete conversion to a tracked system. Ensuring the strict correspondence of the material submitted for the analysis, from the accessioning to the reporting phase, is mandatory in the anatomic pathology laboratory, especially when implementing the digital pathology for primary histological diagnosis. The proposed solutions, up to now, rely on the verification that all the materials present in the glass slide are also present in the whole slide images (WSIs). Although different methods have already been implemented for this purpose (e.g., the “macroimage” of the digital slide, representing the overview of the glass slide), the recent introduction of a device to capture the cut surface of paraffin blocks put the quality control of the digital workflow a step forward, allowing to match the digitized slide with the corresponding block. This system may represent a reliable, easy-to-use alternative to further reduce tissue inconsistencies between material sent to the lab and the final glass slides or WSIs. Methods: The Anatomic Pathology of the Gravina Hospital in Caltagirone, Sicily, Italy, has implemented the application of the BlocDoc devices (SPOT Imaging, Sterling Heights, USA) in its digital workflow. The instruments were positioned next to every microtome/sectioning station, with the possibility to capture the “normal” and the polarized image of the cut surface of the blocks directly by the technician. The presence of a monitor in the BlocDoc device allowed the technician to check the concordance between the cut surface of the block and the material on the corresponding slide. The link between BlocDoc and the laboratory information system, through the presence of the 2D barcode, allowed the pathologists to access the captured image of the cut surface of the block at the pathologist workstation, thus enabling the direct comparison between this image and the WSI (thumbnail and “macroimage”). Results: During the implementation period, more than 10.000 (11.248) blocks were routinely captured using the BlocDoc. The employment of this approach allowed a drastic reduction of the discordances and tissue inconsistencies. The implementation of the BlocDoc in the routine allowed the detection of two different types of “errors,” the so-called “systematic” and “occasional” ones. The first type was intrinsic of some specific specimens (e.g., transurethral resection of the prostate, nasal polypectomies, and piecemeal uterine myomectomies) characterized by the three-dimensional nature of the fragments and affected almost 100% of these samples. On the other hand, the “occasional” errors, mainly due to inexperience or extreme caution of the technicians in handling tiny specimens, affected 98 blocks (0.9%) of these samples and progressively reduced with the rising confidence with the BlocDoc. One of these cases was clinically relevant. No problems in the recognition of the 2D barcodes were encountered using a laser cassette printer. Finally, rare failures have been recorded during the period, accounting for <0.1% of all the cases, mainly due to network connection issues. Conclusions: The implementation of BlocDoc can further improve the effectiveness of the digital workflow, demonstrating its safety and robustness as a valid alternative to the traditional, nontracked analogic workflow.

Synthesis and aggregation properties of ethylene glycol ester-based cationic Gemini surfactants

The gemini surfactants with ethylene glycol as a starting material were synthesized, surface tensions and aggregation properties were evaluated, the wettability on paraffin, PTFE and metaplexis leave surfaces were determined. The experimental results showed the surface tensions of gemini surfactant solutions decrease first and then stabilize with the concentration increasing. The cmc values of surfactants decrease as their hydrophobic chain length increased, with the hydrophobic chain length of 14 shown the smallest γcmc and highest surface activity among these six investigated gemini surfactants. The equilibrium contact angles of investigated surfactant solutions on three solid surfaces of paraffin, PTFE, and metaplexis decrease firstly with the increase of concentrations, and finally stabilize. The 14-2-14 solutions can change surface of metaplexis leaves from hydrophobic to hydrophilic. The contact angles of gemini surfactants on paraffin surfaces vary significantly, and all of the six synthesized gemini surfactants can change paraffin surfaces from hydrophobic to hydrophilic.

Sensitivity of adhesive and cohesive intermolecular forces to the incorporation of MWCNTs into liquid paraffin: Experimental study and modeling of surface tension

In this study, the effect of the presence of MWCNTs on the surface tension of paraffin-based fluid was examined. Surface tension measurements of samples containing MWCNTs (0.005–5 wt%) were performed at temperatures of 25–70°C by SITA dynotester. Surface tension corresponds to the adhesive and cohesive forces resultant. Adding nanoparticles diminishes the cohesive force and simultaneously strengthens the adhesive force. Owing to the presence of MWCNTs, the effect of adhesion on the surface tension was superior to the effect of cohesion which consequently diminishes the surface tension. The loading nanoparticles efficacy on surface tension is weekend as the temperature increases. On the other hand, the presence of particles diminishes the sensitivity of surface tension to the temperature growth. In other words, temperature and mass fraction weaken each other's effects. The highest decrease in surface tension is reported to be 18.6%, which occurs at the lowest temperature as well as the maximum mass fraction. The prediction of MWCNTs/liquid paraffin surface tension behavior was performed by applying nonlinear regression and artificial neural network techniques, and statistical calculations revealed that the R-squared for the first and second techniques was calculated to be 0.99 and 0.998, respectively. Both techniques accurately predict nanofluid surface tension.

Synthesis and characterization of phase change material integrated with aluminium waste as the thermal energy storage medium

In this paper, an investigation of a new innovation of heat storage properties of thermal conductivity enhancement via a newly formulated composite consists of paraffin wax incorporated with waste aluminum can from solid municipal waste as the potential PCM composite was studied. The samples composite was synthesized at different percentage of waste aluminum powder mass loading ranging from 0wt% until 100wt% into the paraffin wax and characterized. From differential scanning calorimetry (DSC) analysis, the rate of heat flow has been has found to be increased as more mass loading of waste aluminum was added. However, the latent heat during melting and freezing of DSC data has reduced. This is due to the high amount filler which has reduced the amount of PCM, whereby latent heat is only absorbed/released by the PCM; not the filler/additive. Besides that, the thermal stability has improved strongly when waste filler is added rather than lone paraffin PCM. The density of waste composite PCM materials has also be found to be higher and thus, has increased the heat flow between the materials and improves the energy storage process. From the addition of filler, the smooth surface of lone paraffin has improved as the surface area has becoming to be rougher and shinier, thus resulted with higher contact surface area. Therefore, the new formulated waste PCM composite of paraffin wax incorporated with aluminum waste ranging from 60wt% and above could become a promising material for TES medium.

Formation of a Corrugated Graphene Substrate on the Paraffin Surface

In this paper, we propose a method of creating a wave-like corrugated surface from graphene nanoparticles. Due to the Kelvin-Helmholtz instability, the graphene suspension flowing onto the melted paraffin forms a wave-like surface. The inhomogeneity wavelength λ can be controlled by changing the relative surface tension.

Interface driven electrical and magneto-transport properties of (100 – x)% La0.7Sr0.3MnO3– x% Paraffin wax (0 ≤ x ≤ 1) hybrid nanocomposites

We report electrical and magneto-transport properties of La0.7Sr0.3MnO3(LSMO)/Paraffin wax nanocomposites prepared through low temperature chemical pyrophoric reaction process. A core shell structure is expected to be formed having a ferromagnetic LSMO core and a spin disordered shell of paraffin wax. Enhanced charging energy due to coulomb blockade contribution with increasing paraffin wax is observed for the composites attributing enhanced intergranular distance between LSMO grains. Effective spin-polarized tunneling of conduction electrons resulting in sharp low field magnetoresistance (MR) of the composites is due to reordering of spin disorder at paraffin wax shell with magnetic field. Moreover, observation of enhanced magnetoresistive hysteresis with decrease in temperature has been attributed to increased blocked states at LSMO grain surface. Calculated surface spin susceptibility (χb) has been found to follow similar behavior of MR with temperature indicating surface magnetization dependent MR. Fitting of magnetoconductance versus field curves reveal increase of Para to ferro transition temperature, TC and χb indicate higher antiferromagnetic coupling of shell spins for composite samples than pristine LSMO above 50 K. χb also indicate systematic decrease in surface spin disorder of the composite samples with respect to pure LSMO which is expected to be due to the probable covalent bond formation between Paraffin wax molecules and surface atoms of LSMO nanoparticles.