Pub Date : 2021-11-17DOI: 10.1080/1539445X.2021.2002100
Cong He, Yi Lin, Chunguang Xiao, Fengrao Lang, Du-xin Li
ABSTRACT In this paper, BN was used for composite modification of the PA6/PC incompatible blends, and the effects of BN filling amount on thermal conductivity of PA6/PC/BN multiphase composites were systematically studied. Results indicated that compared with single-phase matrix composites, the two-phase matrix exhibited slightly better thermal conductivity under the same amount of BN. At the same time, the thermal conductivity of PA6/PC/BN gradually increased with the increase in BN content. When the BN content was 33.33 wt%, the thermal conductivity of PA6/PC/BN composite reached the maximum value of 0.953 W/(m·K), which was about 4.5 times of the matrix. In addition, the content of BN had a great influence on the melting crystallization behavior of the composite, and the addition of BN had a significant increase in the crystallization temperature of the materials.
{"title":"Preparation and characterization of BN modified PA6/PC thermal conductive composites","authors":"Cong He, Yi Lin, Chunguang Xiao, Fengrao Lang, Du-xin Li","doi":"10.1080/1539445X.2021.2002100","DOIUrl":"https://doi.org/10.1080/1539445X.2021.2002100","url":null,"abstract":"ABSTRACT In this paper, BN was used for composite modification of the PA6/PC incompatible blends, and the effects of BN filling amount on thermal conductivity of PA6/PC/BN multiphase composites were systematically studied. Results indicated that compared with single-phase matrix composites, the two-phase matrix exhibited slightly better thermal conductivity under the same amount of BN. At the same time, the thermal conductivity of PA6/PC/BN gradually increased with the increase in BN content. When the BN content was 33.33 wt%, the thermal conductivity of PA6/PC/BN composite reached the maximum value of 0.953 W/(m·K), which was about 4.5 times of the matrix. In addition, the content of BN had a great influence on the melting crystallization behavior of the composite, and the addition of BN had a significant increase in the crystallization temperature of the materials.","PeriodicalId":22140,"journal":{"name":"Soft Materials","volume":"20 1","pages":"278 - 287"},"PeriodicalIF":1.2,"publicationDate":"2021-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46361925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-11DOI: 10.1080/1539445X.2021.2001527
E. Kornilitsina, E. Lebedeva, S. Astaf’eva, D. K. Trukhinov, P. Badica
ABSTRACT The chemical precipitation was used to obtain carbon fibers (CF) with surface modified by magnetite particles (Fe3O4). Processing was carried out by employing up to three subsequent coating stages of ultrasonic treatments. After each sonication stage, the coating was 17, 33, and 47 wt. % of the total weight of the modified fibers. Raman spectroscopy indicates the presence in the coating of a mixture of iron II and III states. As-decorated fibers were used to fabricate composites with an epoxy resin (ED-20) matrix cured with PEPA. The quantity of the carbon fiber filler was of 1, 3, and 6 wt %. At room temperature, the saturation magnetization of the soft magnetic samples was 0.37, 0.83, and 1.72 emu/g for the indicated compositions. Carbon fiber reinforced polymer materials with extra functions such as magnetic in this case, are expected to be useful in applications from the power and energy industries.
{"title":"Soft magnetic composites of carbon fibers decorated with magnetite in an epoxy matrix","authors":"E. Kornilitsina, E. Lebedeva, S. Astaf’eva, D. K. Trukhinov, P. Badica","doi":"10.1080/1539445X.2021.2001527","DOIUrl":"https://doi.org/10.1080/1539445X.2021.2001527","url":null,"abstract":"ABSTRACT The chemical precipitation was used to obtain carbon fibers (CF) with surface modified by magnetite particles (Fe3O4). Processing was carried out by employing up to three subsequent coating stages of ultrasonic treatments. After each sonication stage, the coating was 17, 33, and 47 wt. % of the total weight of the modified fibers. Raman spectroscopy indicates the presence in the coating of a mixture of iron II and III states. As-decorated fibers were used to fabricate composites with an epoxy resin (ED-20) matrix cured with PEPA. The quantity of the carbon fiber filler was of 1, 3, and 6 wt %. At room temperature, the saturation magnetization of the soft magnetic samples was 0.37, 0.83, and 1.72 emu/g for the indicated compositions. Carbon fiber reinforced polymer materials with extra functions such as magnetic in this case, are expected to be useful in applications from the power and energy industries.","PeriodicalId":22140,"journal":{"name":"Soft Materials","volume":"20 1","pages":"S59 - S67"},"PeriodicalIF":1.2,"publicationDate":"2021-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44195382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-02DOI: 10.1080/1539445X.2021.1998119
P. Melenev, A. Ryzhkov, M. Bãlãsoiu
ABSTRACT Following the coarse-grained molecular dynamics approach, we propose a model of a small ferrogel sample (containing up to 1000 magnetic nanoparticles), in which the polymer matrix is presented in the form of a quasi-regular mesh of spring-beads chains and the filler particles are located at the mesh nodes. The state of the sample in the absence of an external field and in the process of quasi-static magnetization is considered for two types of mesh topology (simple cubic and diamond-like), different values of the filler concentration, the strength of dipole interaction, and the energy of magnetic anisotropy. Simulation shows that the use of a softer matrix with a diamond-like structure increases the magneto-mechanical response of the ferrogel. The presence of magnetic anisotropy leads to effective hardening of the ferrogel and, thus, prevents particle clustering and sample magnetization. It was also found that the anisotropy energy determines the type of field-induced changes in the sample volume – this aspect of material behavior is important for the use of ferrogels in controlled delivery and/or release of drugs.
{"title":"Simulation of magneto-mechanical response of ferrogel samples with various polymer structure","authors":"P. Melenev, A. Ryzhkov, M. Bãlãsoiu","doi":"10.1080/1539445X.2021.1998119","DOIUrl":"https://doi.org/10.1080/1539445X.2021.1998119","url":null,"abstract":"ABSTRACT Following the coarse-grained molecular dynamics approach, we propose a model of a small ferrogel sample (containing up to 1000 magnetic nanoparticles), in which the polymer matrix is presented in the form of a quasi-regular mesh of spring-beads chains and the filler particles are located at the mesh nodes. The state of the sample in the absence of an external field and in the process of quasi-static magnetization is considered for two types of mesh topology (simple cubic and diamond-like), different values of the filler concentration, the strength of dipole interaction, and the energy of magnetic anisotropy. Simulation shows that the use of a softer matrix with a diamond-like structure increases the magneto-mechanical response of the ferrogel. The presence of magnetic anisotropy leads to effective hardening of the ferrogel and, thus, prevents particle clustering and sample magnetization. It was also found that the anisotropy energy determines the type of field-induced changes in the sample volume – this aspect of material behavior is important for the use of ferrogels in controlled delivery and/or release of drugs.","PeriodicalId":22140,"journal":{"name":"Soft Materials","volume":"20 1","pages":"S50 - S58"},"PeriodicalIF":1.2,"publicationDate":"2021-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41717489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-31DOI: 10.1080/1539445X.2021.1996392
E. Çatıker, M. Atakay, B. Salih
ABSTRACT Novel ABA-type block copolymers were prepared using end-groups activated poly(ethylene glycol) (PEG) as an initiator for hydrogen transfer polymerization (HTP). For this purpose, PEG with average molar mass of 1450 Da (PEG-1450) was firstly treated with the equivalent amount of sodium hydride to synthesize PEG with dialkoxide end-groups, namely PEG-dialkoxide. Using the PEG-dialkoxide as a macroinitiator, base-catalyzed HTP of acrylamide, N-methoxypropyl acrylamide, and 2-hydroxyethyl acrylate were then performed to achieve the novel ABA-type block copolymers. The copolymers were obtained with high yields of about 90%. Characterization of the ABA-type copolymers was carried out using Fourier Transform Infrared Spectroscopy (FTIR spectroscopy) and Matrix Assisted Laser Desorption Ioizaton (MALDI) mass spectrometry. FTIR spectra of the copolymers exhibited some characteristic bands assigned to the functional groups arising from the mechanism of HTP. Molar mass distributions of the copolymers from the MALDI mass study pointed out that chain extensions by mass in each copolymer were almost equal. Hence, the MALDI mass spectra of the copolymers revealed that chain extensions of telechelic PEGs by β-alanine, 2-hydroxyethyl acrylate, and N-methoxypropyl β-alanine units were successfully fulfilled.
{"title":"Novel ABA–type Block Copolymers from Telechelic PEG–initiated Hydrogen–transfer Polymerization","authors":"E. Çatıker, M. Atakay, B. Salih","doi":"10.1080/1539445X.2021.1996392","DOIUrl":"https://doi.org/10.1080/1539445X.2021.1996392","url":null,"abstract":"ABSTRACT Novel ABA-type block copolymers were prepared using end-groups activated poly(ethylene glycol) (PEG) as an initiator for hydrogen transfer polymerization (HTP). For this purpose, PEG with average molar mass of 1450 Da (PEG-1450) was firstly treated with the equivalent amount of sodium hydride to synthesize PEG with dialkoxide end-groups, namely PEG-dialkoxide. Using the PEG-dialkoxide as a macroinitiator, base-catalyzed HTP of acrylamide, N-methoxypropyl acrylamide, and 2-hydroxyethyl acrylate were then performed to achieve the novel ABA-type block copolymers. The copolymers were obtained with high yields of about 90%. Characterization of the ABA-type copolymers was carried out using Fourier Transform Infrared Spectroscopy (FTIR spectroscopy) and Matrix Assisted Laser Desorption Ioizaton (MALDI) mass spectrometry. FTIR spectra of the copolymers exhibited some characteristic bands assigned to the functional groups arising from the mechanism of HTP. Molar mass distributions of the copolymers from the MALDI mass study pointed out that chain extensions by mass in each copolymer were almost equal. Hence, the MALDI mass spectra of the copolymers revealed that chain extensions of telechelic PEGs by β-alanine, 2-hydroxyethyl acrylate, and N-methoxypropyl β-alanine units were successfully fulfilled.","PeriodicalId":22140,"journal":{"name":"Soft Materials","volume":"20 1","pages":"232 - 239"},"PeriodicalIF":1.2,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47528671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-28DOI: 10.1080/1539445X.2021.1996393
X. Li, F. Wang, Jiaxin Ma, Haibiao Zhu, Rui Yang, Hirofumi Tanaka, Xiaoming Ma, L. Hong
ABSTRACT Pickering emulsion plays an important role in various industrial fields including food, catalysis, and bioscience. Soy protein isolate (SPI) has been proved feasible for stabilizing Pickering emulsion after modification, though such methods were either difficult to proceed or application restrictive. Herein, we report a simple fabrication of oil-in-water Pickering emulsion using a complex of SPI and carbon nanotubes (CNTs)/carboxymethyl cellulose sodium (CMC-Na). The stability of our emulsion could be kept at a wide range of CNTs diameter, oil fraction, and pH, while the emulsion droplet size might be controlled through the tuning of pH and dispersed phase solvent as well. A strong interaction between SPI and CNTs/CMC-Na is a key factor for the homogeneous distribution of CNTs at the aqueous–organic interface, which benefits the Pickering emulsion formation. Our work will offer some useful thoughts for improving the stability of protein-integrated emulsion.
{"title":"Droplet size controllable fabrication of Pickering emulsion stabilized by soy protein isolate-carbon nanotubes/carboxymethyl cellulose sodium","authors":"X. Li, F. Wang, Jiaxin Ma, Haibiao Zhu, Rui Yang, Hirofumi Tanaka, Xiaoming Ma, L. Hong","doi":"10.1080/1539445X.2021.1996393","DOIUrl":"https://doi.org/10.1080/1539445X.2021.1996393","url":null,"abstract":"ABSTRACT Pickering emulsion plays an important role in various industrial fields including food, catalysis, and bioscience. Soy protein isolate (SPI) has been proved feasible for stabilizing Pickering emulsion after modification, though such methods were either difficult to proceed or application restrictive. Herein, we report a simple fabrication of oil-in-water Pickering emulsion using a complex of SPI and carbon nanotubes (CNTs)/carboxymethyl cellulose sodium (CMC-Na). The stability of our emulsion could be kept at a wide range of CNTs diameter, oil fraction, and pH, while the emulsion droplet size might be controlled through the tuning of pH and dispersed phase solvent as well. A strong interaction between SPI and CNTs/CMC-Na is a key factor for the homogeneous distribution of CNTs at the aqueous–organic interface, which benefits the Pickering emulsion formation. Our work will offer some useful thoughts for improving the stability of protein-integrated emulsion.","PeriodicalId":22140,"journal":{"name":"Soft Materials","volume":"20 1","pages":"240 - 249"},"PeriodicalIF":1.2,"publicationDate":"2021-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41405934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-23DOI: 10.1080/1539445X.2021.1995424
O. Tomchuk, L. Bulavin, M. Avdeev
ABSTRACT Small-angle neutron scattering (SANS) is widely used in structural analysis of complex liquid dispersions. An essential feature of SANS experiments for such systems is hydrogen/deuterium isotopic substitution in liquid media, which makes it possible to change the neutron scattering length density of the solvents, thus providing the basis for the contrast variation technique. In some cases, for dispersed particles with near-spherical symmetry, one can observe in the scattering curves specific points at which the scattered intensity is independent of the scattering contrast between dispersed particles and solvent. These points are referred to as ‘isoscattering points’ and in monodisperse solutions related to the particle size. Here, we report this effect for rather polydisperse (above 40%) magnetic fluids with core-shell particles in a liquid medium (water). It is shown that the effective isoscattering point can be analyzed to some extent for polydisperse systems, which gives additional possibilities for structural characterization of complex solutions via SANS.
{"title":"Isoscattering point in SANS contrast variation study of aqueous magnetic fluids","authors":"O. Tomchuk, L. Bulavin, M. Avdeev","doi":"10.1080/1539445X.2021.1995424","DOIUrl":"https://doi.org/10.1080/1539445X.2021.1995424","url":null,"abstract":"ABSTRACT Small-angle neutron scattering (SANS) is widely used in structural analysis of complex liquid dispersions. An essential feature of SANS experiments for such systems is hydrogen/deuterium isotopic substitution in liquid media, which makes it possible to change the neutron scattering length density of the solvents, thus providing the basis for the contrast variation technique. In some cases, for dispersed particles with near-spherical symmetry, one can observe in the scattering curves specific points at which the scattered intensity is independent of the scattering contrast between dispersed particles and solvent. These points are referred to as ‘isoscattering points’ and in monodisperse solutions related to the particle size. Here, we report this effect for rather polydisperse (above 40%) magnetic fluids with core-shell particles in a liquid medium (water). It is shown that the effective isoscattering point can be analyzed to some extent for polydisperse systems, which gives additional possibilities for structural characterization of complex solutions via SANS.","PeriodicalId":22140,"journal":{"name":"Soft Materials","volume":"20 1","pages":"S44 - S49"},"PeriodicalIF":1.2,"publicationDate":"2021-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47171969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-22DOI: 10.1080/1539445X.2021.1992425
V. Lebedev, G. Török, Yury V. Kulvelis, Olga I. Bolshkova, N. Yevlampieva, M. Soroka, E. V. Fomin, A. Vul, S. Garg
ABSTRACT Recent results on synthesis, structural, and physicochemical studies of complexes based on detonation nanodiamonds modified with metal-organic molecules with functional magnetic and fluorescent properties have been presented. Neutron scattering experiments have discovered subtle features of the assembly of electro-negative molecules of Eu diphthalocyanines and nanodiamonds with positive surface potential in aqueous media. Nanoscale ordering of diamonds reinforced by their linking via diphthalocyanines was confirmed by TEM. The stable complexes possess X-ray luminescent and magnetic properties. Such nanostructures with low toxicity are prospective as contrasting and photoactive agents for magnetic resonance imaging and photodynamic therapy.
{"title":"Diamond-based nanostructures with metal-organic molecules","authors":"V. Lebedev, G. Török, Yury V. Kulvelis, Olga I. Bolshkova, N. Yevlampieva, M. Soroka, E. V. Fomin, A. Vul, S. Garg","doi":"10.1080/1539445X.2021.1992425","DOIUrl":"https://doi.org/10.1080/1539445X.2021.1992425","url":null,"abstract":"ABSTRACT Recent results on synthesis, structural, and physicochemical studies of complexes based on detonation nanodiamonds modified with metal-organic molecules with functional magnetic and fluorescent properties have been presented. Neutron scattering experiments have discovered subtle features of the assembly of electro-negative molecules of Eu diphthalocyanines and nanodiamonds with positive surface potential in aqueous media. Nanoscale ordering of diamonds reinforced by their linking via diphthalocyanines was confirmed by TEM. The stable complexes possess X-ray luminescent and magnetic properties. Such nanostructures with low toxicity are prospective as contrasting and photoactive agents for magnetic resonance imaging and photodynamic therapy.","PeriodicalId":22140,"journal":{"name":"Soft Materials","volume":"20 1","pages":"S34 - S43"},"PeriodicalIF":1.2,"publicationDate":"2021-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49048144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-19DOI: 10.1080/1539445X.2021.1992426
Joslaine Jacumazo, C. C. Perez, N. Khalil, C. Almeida
ABSTRACT Acetoxy DMU (Ac.DMU – 1,2,3-trimethoxy-5-(4-acetoxystyryl) benzene) is a potential new drug, compared to resveratrol, due to its improved pharmacokinetic properties. Nanoencapsulation using Ac.DMU and carboxymethylchitosan (CMCh) polymer is a promising alternative for improving the bioavailability of drugs in human bodies. Nanocapsules (NCs) based on CMCh with Ac.DMU (Ac.DMU-NCs) by emulsion solvent diffusion technique in different drug-to-polymer ratios have been prepared with encapsulation efficiency of 69.4% and 51.5% and characterized by dynamic light scattering, ζ-potential, and infrared spectroscopy techniques. In vitro release experiments of free Ac.DMU and Ac.DMU-NCs showed an improvement in the solubility of Ac.DMU by NCs, enabling a fast drug release rate. In addition, the method was validated through analyses of specificity, linearity, limit of detection and quantification, accuracy, and precision according to the standards suggested by the International Conference on Harmonization. UV–Vis spectroscopy used to quantify Ac.DMU ensured reliable results for the amount of encapsulated Ac.DMU. The results suggest a promising potential of NCs as carriers of the hydrophobic drug Ac.DMU for controlled release. Graphical abstract
与白藜芦醇相比，乙酰氧基DMU (Ac.DMU - 1,2,3-三甲氧基-5-(4-乙酰氧基苯基)苯)具有更好的药动学性质，是一种潜在的新药。采用Ac.DMU和羧甲基壳聚糖(CMCh)聚合物进行纳米胶囊化是提高药物在人体内生物利用度的一种很有前景的方法。采用乳液溶剂扩散技术制备了不同药聚比的cmc - Ac.DMU纳米胶囊(Ac.DMU-NCs)，包封率分别为69.4%和51.5%，并通过动态光散射、相移电位和红外光谱技术对其进行了表征。体外释放实验表明，nc提高了Ac.DMU的溶解度，使Ac.DMU释放速度快。并根据国际协调会议(International Conference on Harmonization)建议的标准，通过特异性、线性度、检出限和定量限、准确度和精密度分析对方法进行了验证。采用紫外可见光谱法定量测定Ac.DMU，保证了Ac.DMU包封量的可靠结果。结果表明，NCs作为疏水药物Ac.DMU的控释载体具有很大的潜力。图形抽象
{"title":"Acetoxy DMU-loaded carboxymethylchitosan nanocapsules: preparation and in vitro release evaluation followed by an analytical methodology validation","authors":"Joslaine Jacumazo, C. C. Perez, N. Khalil, C. Almeida","doi":"10.1080/1539445X.2021.1992426","DOIUrl":"https://doi.org/10.1080/1539445X.2021.1992426","url":null,"abstract":"ABSTRACT Acetoxy DMU (Ac.DMU – 1,2,3-trimethoxy-5-(4-acetoxystyryl) benzene) is a potential new drug, compared to resveratrol, due to its improved pharmacokinetic properties. Nanoencapsulation using Ac.DMU and carboxymethylchitosan (CMCh) polymer is a promising alternative for improving the bioavailability of drugs in human bodies. Nanocapsules (NCs) based on CMCh with Ac.DMU (Ac.DMU-NCs) by emulsion solvent diffusion technique in different drug-to-polymer ratios have been prepared with encapsulation efficiency of 69.4% and 51.5% and characterized by dynamic light scattering, ζ-potential, and infrared spectroscopy techniques. In vitro release experiments of free Ac.DMU and Ac.DMU-NCs showed an improvement in the solubility of Ac.DMU by NCs, enabling a fast drug release rate. In addition, the method was validated through analyses of specificity, linearity, limit of detection and quantification, accuracy, and precision according to the standards suggested by the International Conference on Harmonization. UV–Vis spectroscopy used to quantify Ac.DMU ensured reliable results for the amount of encapsulated Ac.DMU. The results suggest a promising potential of NCs as carriers of the hydrophobic drug Ac.DMU for controlled release. Graphical abstract","PeriodicalId":22140,"journal":{"name":"Soft Materials","volume":"20 1","pages":"219 - 231"},"PeriodicalIF":1.2,"publicationDate":"2021-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43742519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-29DOI: 10.1080/1539445X.2021.1984946
A. Lebedev
ABSTRACT The stability of a stabilized with polydimethylsiloxane (PDMS) magnetic fluid to alcohols of a saturated homologous series was investigated. We used alcohols with a linear molecular structure and their possible isomers. It was found that the solubility of the PDMS stabilized particles strongly depends on the molecular weight of the coagulant and, quite unexpectedly, on the degree of isomerization. The first tested coagulants, ethanol and acetone, did not mix with PDMS stabilized magnetic fluid. The next member of the homologous series, linear propanol, is the most effective coagulant that causes a sharp precipitation of particles. Meanwhile, with isopropanol, coagulation occurs very smoothly. The butanol isomers differ even more. Normal butanol causes the liquid to coagulate at a higher concentration than propanol, whereas tret-butanol mixes with PDMS stabilized magnetic fluid in any proportion. The last linear alcohol in the homologous series that can serve as a coagulant is hexanol-1. The next members of the homologous series do not mix with the PDMS stabilized magnetic fluid. This is typical only for linear molecules. For example, 2-ethylhexanol (isooctanol) perfectly dissolves PDMS stabilized particles. This property can be used to separate mixtures of isomers and linear molecules.
{"title":"Stabilization of magnetic fluid with polydimethylsiloxane kills three birds with one stone","authors":"A. Lebedev","doi":"10.1080/1539445X.2021.1984946","DOIUrl":"https://doi.org/10.1080/1539445X.2021.1984946","url":null,"abstract":"ABSTRACT The stability of a stabilized with polydimethylsiloxane (PDMS) magnetic fluid to alcohols of a saturated homologous series was investigated. We used alcohols with a linear molecular structure and their possible isomers. It was found that the solubility of the PDMS stabilized particles strongly depends on the molecular weight of the coagulant and, quite unexpectedly, on the degree of isomerization. The first tested coagulants, ethanol and acetone, did not mix with PDMS stabilized magnetic fluid. The next member of the homologous series, linear propanol, is the most effective coagulant that causes a sharp precipitation of particles. Meanwhile, with isopropanol, coagulation occurs very smoothly. The butanol isomers differ even more. Normal butanol causes the liquid to coagulate at a higher concentration than propanol, whereas tret-butanol mixes with PDMS stabilized magnetic fluid in any proportion. The last linear alcohol in the homologous series that can serve as a coagulant is hexanol-1. The next members of the homologous series do not mix with the PDMS stabilized magnetic fluid. This is typical only for linear molecules. For example, 2-ethylhexanol (isooctanol) perfectly dissolves PDMS stabilized particles. This property can be used to separate mixtures of isomers and linear molecules.","PeriodicalId":22140,"journal":{"name":"Soft Materials","volume":"20 1","pages":"S30 - S33"},"PeriodicalIF":1.2,"publicationDate":"2021-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48759558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-25DOI: 10.1080/1539445X.2021.1974475
Alexandrina Teusdea, P. C. Fannin, I. Malaescu, C. Marin
ABSTRACT Measurements are presented of the frequency and field dependent, complex magnetic permeability, μ(f, H) = μ′(f, H)-i μ″(f, H), of a kerosene-based ferrofluid sample with magnetite particles, over the frequency range, f, of 0.4–6 GHz, and polarizing field, H, range of 0–102 kA/m. In this frequency range, both the ferromagnetic resonance at a frequency, f res , and the corresponding maximum absorption at a frequency, f max , were determined. From the H dependence of both f res and the ratio of f max /f res , we determined the anisotropy field, H A , the anisotropy constant K eff , the gyromagnetic ratio, , the damping parameter, , the spectroscopic splitting factor, g, and the internal magnetic viscosity, . Also, the theoretical Néel relaxation time, , was evaluated. Furthermore, the measurements of, μ(f), enabled one to study the effect of, H, on the the specific absorption rate, SAR, and the time dependence of the variation in temperature, ΔT, of the investigated ferrofluid sample. The SAR was calculated, using a new equation for the calculation of the SAR of ferrofluids. This equation offers a more precise computation of the SAR in that it takes into account the density of the ferrofluid ρ F , as opposed to using just the density of the dispersed solid particles, ρ S . These results illustrate how control of the SAR and the variation in ΔT, of the ferrofluid sample, through the variation of H, and has applications in the treatment of cancer by magnetic hyperthermia, for modeling bio-heat transfer phenomena, microwave heating or the possibility of use of the ferrofluid as a shield material against microwave electromagnetic radiation. Also, knowledge of the magnetic parameters of ferrofluids, is useful in the design and manufacture of some microwave devices.
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