Solution Spinning Method Research Articles

Preparation and aggregate structure of polyacrylonitrile and microcrystalline cellulose hygroscopic thermal composite fibers

AbstractHygroscopic thermal fibers are a kind of functional material that makes use of moisture to generate heat for fabrics. In this work, composite fibers of polyacrylonitrile (PAN) and microcrystalline cellulose (MCC) with various compositions were prepared using a solution spinning method. Besides the promotion of mechanical properties of PAN by addition of cellulose reported in previous research, this study focused on the hygroscopic thermal property of blends and spun fibers of PAN and cellulose. The content of MCC in the composite fibers has a significant effect on the hygroscopic thermal property. At a temperature of 17 °C and humidity of 90%, the maximum temperature increase of composite fibers could reach 4.9 °C. The composite fibers exhibited an obvious temperature response of on–off humidity circulation during testing. The breaking strength of the composite fibers was higher than 100 MPa. The influence of addition of cellulose on morphology, especially on the crystallinity and lateral size of PAN microfibrils, and the relationship between the morphology and hygroscopic thermal property were investigated by means of wide‐angle X‐ray diffraction and small‐angle X‐ray scattering in terms of experiment and theory. A smaller lateral size of microfibril led to a better hydroscopic thermal property. The composite fibers were expected to be used in temperature regulation clothing. © 2022 Society of Industrial Chemistry.

Superconducting properties and pinning mechanism of filamentary (Sm,Gd,Dy)–Ba–Cu–O doped with Co

In this work, the effect of cobalt (Co) doping on the superconducting properties of filamentary (Sm1/3Gd1/3Dy1/3)1.18Ba2.12Cu3.09−xCoxOy (SGD123, x = 0 − 1.20) superconductors was investigated using samples prepared using a solution spinning method. Its pinning mechanism was also examined. The Co-doped x = 5.0 × 10−4 and 1.0 × 10−3 samples obtained a Jc value higher than that of the pure sample, although the Tc value of the SGD123 filaments slightly decreased with increasing Co content. The anisotropic behavior of the field dependence of the transport Jc can hardly be confirmed for the pure sample. The superconductivity of the pure sample disappeared at an applied magnetic field approximately 12 T, at most. In contrast, Co-doped x = 1.0 × 10−3 sample showed the angular dependence of the transport Jc in an applied magnetic field. Furthermore, the Co-doped x = 1.0 × 10−3 sample rotated at 90° maintained a Jc value higher than 103 A cm−2 in a magnetic field up to 17.5 T. Co doping was effective in enhancing Jc at self-field and high magnetic field. In addition, we attempted to elucidate the pinning mechanism of Co on the Jc enhancement of the SGD123 filament using scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy measurements.

Preparation and Characterization of CarboxymethylCellulose Hydrogel Fibers

Carboxymethyl cellulose (CMC) hydrogel fibers were prepared via a solution spinning method with aluminum sulfate as the crosslinking agent. The preparation process of the CMC hydrogel fibers was optimized via orthogonal experiments. FTIR, POM, SEM and TGA were used to characterize the structure and properties of the hydrogel fibers. The mechanical properties and absorption ability of the hydrogel fibers were also investigated. The results indicated that an even structure was formed in the hydrogel. The mechanical properties of the hydrogel fibers were improved with increasing CMC degree of substitution. The hydrogel fibers had excellent moisture absorption performance, and are well-suited for biomedical applications such as wound dressings.

Effect of Co doping on the transport critical current density of rapidly heat-treated filamentary (Nd,Sm,Gd)–Ba–Cu–O superconductors

We investigated the effect of Co doping on the superconducting properties and microstructure of ternary (Nd0.33Sm0.33Gd0.33)1.18Ba2.12Cu3.09O7−δ (NSG123) filaments. Filamentary NSG123 superconductors chemically doped with a nominal Co concentration between 0 and 0.5 at% were prepared by a solution spinning method. Filamentary samples were partially melted at 1050 °C for 30 min and rapidly cooled to 910 °C at a rate of 60 °C h−1 under an atmosphere of flowing 0.1% O2 + Ar gas. The filamentary NSG123 superconductor with 0.05 at% Co exhibited a high critical current density ( Jc) of 2.0 × 104 A cm−2, whereas the pure NSG123 sample exhibited a maximum transport Jc value of 3.0 × 103 A cm−2. Furthermore, the sample doped with 0.05 at% Co maintained a high transport Jc value of 4.5 × 103 A cm−2 under an applied magnetic field up to 17 T at 77 K, whereas the superconductivity of the pure sample disappeared at approximately 11 T. The Co-doped samples also exhibited low electrical resistivity at normal state compared to that of the pure sample. These results confirm that Co doping effectively enhances the Jc and connectivity in the microstructure of filamentary NSG123 samples subjected to a heat treatment with rapid cooling.

Potential of Tourmaline/Chitosan Fiber for Wound Dressing

The novel tourmaline/chitosan (Tur/CS) composite fibers were successfully prepared by solution spinning method. The fibers had the diameter of 200-300μm.Tur particles were distributed evenly inside the composite fibers. The crystal structure of CS was not remarkable changed except of the crystallinity decreasing. Then L929 cells were co-cultured on the composite fibers to access the cytotoxicity in vitro.Suitable mass ration of Tur/CS composite fibers were found to be the most promising matrix for the attachment and spreading of the L929 cells. This novel fiber can be used as potential wound dressings for skin regeneration.

A study of mechanical behavior and morphology of carbon nanotube reinforced UHMWPE/Nylon 6 hybrid polymer nanocomposite fiber

We report a phenomenal increase in strength, modulus, and fracture strain of ultra high molecular weight polyethylene (UHMWPE) fiber by 103 %, 219 %, and 108 %, respectively through hybridizing this fiber with Nylon 6 as a minor phase and simultaneously reinforcing it with single-walled carbon nanotubes (SWCNTs). Loading of Nylon 6 and SWCNTs into UHMWPE was 20.0 wt% and 2.0 wt%, respectively. Hybridized fibers were processed using a solution spinning method coupled with melt mixing and extrusion. We claim that the enhancement in strain-to-failure of the nanocomposites is due to induced plasticity in the hybridized Nylon 6-UHMWPE polymers. The enhancement in strength and stiffness in the nanocomposites is attributed to the load sharing of the SWCNTs during deformation. Differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) studies showed that changes in percent crystallinity, rate of crystallization, crystallite size, alignment of nanotubes, sliding of polymer interfaces and strong adhesion of CNT/polymer blends were responsible for such enhancements.

Elastic Properties of UHMWPE-SWCNT Nanocomposites’ Fiber: An Experimental, Theoretic, and Molecular Dynamics Evaluation

Ultrahigh molecular weight polyethylene (PE) filaments were reinforced with 2 wt.% of single-walled carbon nanotubes (SWCNTs). The solution spinning method was used to produce both neat and reinforced PE filaments. Tensile tests and strain hardening through repeated loading-unloading cycles of the filaments revealed a spectacular contribution of the SWCNTs in enhancing the elastic properties, e.g., strength and modulus. The theoretic strength and modulus of the reinforced PE were predicted using the shear lag model and micromechanics-based model, respectively, and verifying with experimental results. It was observed that the predicted strength and modulus were comparable only with those obtained after strain hardening. In the next step, a molecular dynamic simulation was conducted by simulating a unit cell containing a SWCNT surrounded by PE matrix subjected to uniaxial tensile strain. The strength and modulus of the simulated structure showed an agreement, to certain extent, with experimental observations of strain-hardened nanocomposites.

Influence of Zr- and Sn-Doping on Sm-Ba-Cu-O Filaments Fabricated by a Chemical Solution Spinning

The effect of Zr and Sn addition on the critical current density (Jc) and the microstructure of filamentary SmBa2Cu3Oy (Sm123) has been investigated. Samples with additions fabricated by a solution spinning method were partially melted under an atmosphere gas containing 0.1-3.0% O2. After heat-treatment, homogeneous dispersion of fine Sm2BaCuO5 (Sm211) particles was observed in the Zr-doped sample. The 0.2 at% Zr-doped Sm123 showed the depressed Jc value of 1.8 × 104 at 77 K and self-field compared with the undoped sample. From the Jc measurement in magnetic fields, Jc value higher than 103 A/cm2 at 77 K was maintained up to 8 T. On the other hand, 0.2 at% Sn-added sample showed high Jc value of 5.0 × 104 A/cm2 at 77 K and self-field, and the Jc value higher than 103 A/cm2 is maintained up to 17 T. A small amount of Sn doping was found to be effective in increasing the Jc under high magnetic field and the irreversibility field of Sm123 filaments.

Effect of strain hardening on the elastic properties and normalized velocity of hybrid UHMWPE–nylon 6–SWCNT nanocomposites fiber

Abstract

溶液紡糸法による(Sm,Gd,Dy)-Ba-Cu-Oフィラメントの作製と超伝導特性の評価

溶液紡糸法による(Sm,Gd,Dy)-Ba-Cu-Oフィラメントの作製と超伝導特性の評価

Fabrication and Superconducting Properties of Aluminum Doped (Nd,Sm,Gd)–Ba–Cu–O Filaments

(Nd0.33Sm0.33Gd0.33)1.18Ba2.12Cu3.09Oy (NSG123) precursor filaments doped with Al were prepared by a solution spinning method and partially melted at 1050degC for 30 min in flowing 0.1% O2 + Ar gas. Samples were cooled at various rate of 10-60degC/h, and then oxygenated in pure O2 gas. It was found that the microstructural and superconducting properties were strongly influenced on the cooling rate from partial melting temperature to 900degC during OCMG processing. Although the sample without Al cooled at 20-50degC/h showed Jc value higher than 2.0 times 104 A / cm2 at 77 K and 0 T, the sample treated at fast cooling rate of 60degC/h exhibited the Jc value of about 3.0 times 103 A / cm2 at most. In contrast, the NSG123 doped with 0.05 at%Al even at a rate of 60degC/h cooling showed high Jc value of 1.5 times 104 A / cm2 at 77 K and 0 T, and exhibited a well aligned texture and a dense microstructure. From Jc measurements in applied magnetic fields, a Jc value higher than 103 A / cm2 was maintained up to 9 T for 0.05 at % Al doped filament. It was found that a small amount of Al doping into NSG123 was effective on refinement of the size of the NSG211 particle and reduction pores and cracks in microstructure for sample treated even at fast cooling, and thereby increased Jc values.

Effect of Pt Addition on Microstructure and Superconducting Properties for Filamentary (Nd,Sm,Gd)-Ba-Cu-O Superconductors

The filamentary (Nd0.33Sm0.33Gd0.33)1.18-Ba2.12Cu3.09Oy (NSG123) superconductors chemically doped with nominal Pt concentrations from 0 to 0.5 at% were fabricated by a solution spinning method. We investigated effects of the amount of Pt addition and cooling rate from partial melting temperature of 1050 degC during OCMG processing on superconducting properties and microstructure of filamentary samples. Pure NSG123 filaments cooled at 20 degC/h-50degC/h showed the Jc vale higher than 2.0 times 104 A / cm2 at 77 K and 0 T. Although the sample treated at fast cooling rate of 60 degC/h exhibited the Jc value of about 3.0 times 103A/cm2 at most, the NSG123 doped with 0.05 at% Pt cooled at 60 degC/h showed high Jc value of 2.0 times 104 A / cm2 at 77 K and 0 T. The field dependence of transport Jc value was also investigated at 77 K for samples cooled at 60 degC/h. The Jc value of 0.8 times 104 A / cm2 was maintained up to magnetic field of 5 T for the 0.05 at% Pt doped sample. The size of (Nd,Sm,Gd)2BaCuO5 particles in NSG123 matrix was reduced from about 3 to 0.5 mum with increasing Pt concentration from 0 to 0.5 at%. In addition, the connectivity in microstructure was improved with increasing Pt concentration. It was found that both Jc-B properties and the microstructure for the sample treated at fast cooling were effectively improved by Pt doping.

Partial Melting in Filamentary NSG123 Superconductors Under Various Oxygen Atmospheres

Precursor filaments with starting composition (Nd <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.33</sub> ,Sm <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.33</sub> ,Gd <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.33</sub> ) : Ba : Cu = 1.18 : 2.12 : 3.09 were prepared by a solution spinning method. Samples were partially melted at temperature range of 1020-1090degC in flowing 0.1%O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> + Ar, 1%O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> + Ar and 20%O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> + Ar and then oxygenated in pure 100%C>2 gas. The T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> value decreased from 91.3 K to 88.8 K with increasing oxygen concentration in atmosphere gas. A transport J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> value higher than 104 A/cm at 77 K and 0 T was showed over a wide temperature range of 1030-1080degC in 0.1%O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> + Ar and 1040-1090degC in 1%02 + Ar. Especially, the 0.1%O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> + Ar sample partially melted at 1050degC and the 1%02 + Ar sample at 1060degC exhibited the highest J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> value of 2.7 x 104 A/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and 2.5 x 104 A/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , respectively. The transport J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> value of the sample melted in flowing 0.1%O <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> + Ar was maintained higher than 2.4 x 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> A/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> at 77 K in applied magnetic fields up to 17 T. On the other hand, the maximum J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> value at 77 K and 0 T for the sample treated in 20%O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> + Ar melted at 1080degC showed 5.4 X 103 A/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> at most, and the superconductivity was disappeared at magnetic field of 7 T.

Transport Critical Current of Filamentary Zr-Doped Gd-Ba-Cu-O Superconductors in High Magnetic Fields

Filamentary Gd-Ba-Cu-O superconductors doped with nominal Zr concentrations between 0 and 0.5 at% relative to Gdl23 were prepared by a solution spinning method. Samples were partially melted in flowing 20% O2 + Ar atmosphere gas at various partial melting temperatures and oxygenated in pure oxygen gas. High J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> value of 2 times 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> A/cm at 77 K and 0 T were obtained for the Gd123 + 0.1at%Zr sample optimally processed. In the case of doping levels less than 0.5 at %, T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> values, which were about 92 K with sharp transitions, were hardly influenced by Zr concentration. From transport critical current measurements in magnetic fields, the J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> value of the pure Gd123 filament sharply decreased with increasing applied field. Gd123 with 0.5 at%Zr doping processed under optimum conditions showed little deterioration of J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> values in low magnetic fields and J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> values higher than 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> A/cm was maintained up to 14 T. It was also found that J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> s in high magnetic field and the irreversibility field were improved by a small amount of Zr doping.

Initial composition dependence of the critical current density in filamentary NSG123 superconductors

The effect of the starting composition on the superconducting properties for ternary system (Nd, Sm, Gd)–Ba–Cu–O filaments was systematically investigated. The filaments with the composition of (Nd 0.33,Sm 0.33,Gd 0.33) 1.18Ba 2.12Cu 3.09O y (sample A), (Nd 0.50,Sm 0.25,Gd 0.25) 1.18Ba 2.12Cu 3.09O y (sample B), (Nd 0.25,Sm 0.50,Gd 0.25) 1.18Ba 2.12Cu 3.09O y (sample C) and (Nd 0.25,Sm 0.25,Gd 0.50) 1.18Ba 2.12Cu 3.09O y (sample D) were prepared by a solution spinning method. All samples partially melted at temperature range of 1030–1080 °C in flowing 0.1% O 2 + Ar exhibited J c value higher than 10 4 A/cm 2 at 77.3 K and self-field. Among these samples, the best transport J c value of 7.2 × 10 4 A/cm 2 was attained in sample B with Nd-rich composition. The field dependence of transport J c value was also examined at various temperatures between 77.3 K and 90 K in applied magnetic fields up to 17 T. In the case of samples A, the J c value gradually decreased with increasing the applied magnetic field, and the J c value of 2.4 × 10 3 A/cm 2 at 77.3 K was maintained up to high magnetic fields of 17 T. On the contrary, the J c value of sample B decreased with increasing the applied magnetic field and the superconductivity disappeared at about 15 T. It was found that the three element ratio in NSG123 contributed to flux pinning in a different manner and affected in J c behavior in magnetic field.

Critical current density of filamentary NSG123 superconductors in high magnetic field

(Nd0.33Sm0.33Gd0.33)1.18Ba2.12Cu3.09Oy filaments have been successfully fabricated by a solution spinning method and OCMG processing. We have systematically investigated the relationship between cooling rate from the partial-melting temperature and transport Jc value for filamentary samples treated in 0.1%O2+Ar. It was found that both the Jc value and the microstructure of samples depended on the cooling rate. The samples partially melted at 1050°C and cooling rate of 10–50°C/h showed Jc value higher than 104A/cm2. The maximum Jc value of 3.0×104A/cm2 was obtained for 40°C/h sample. The transport Jc was also measured at 83–90K in external magnetic fields up to 17T. The 10°C/h sample exhibited superior Jc behavior and a Jc value of 1.1×103A/cm2 at 83K was maintained up to 17T, in which fine (Nd,Sm,Gd)2BaCuO5 particles about 1μm in diameter were homogeneously dispersed.

Microstructures and critical current density of filamentary Eu–Ba–Cu–O with Zr and Zn additions

The effect of Zr and Zn doping on superconducting properties and microstructures of filamentary Eu–Ba–Cu–O superconductors prepared by a solution spinning method has been investigated. Samples doped with small amounts of Zr and Zn showed relatively high Jc values of around 2×104Acm−2 at 77K and 0T, which was two times larger than that of the pure Eu123 filament. The temperature range for the partial melting in reduced oxygen partial pressure obtained the Jc value higher than 104Acm−2 at 77K became wider when Zr and Zn were added. From the SEM observation, a small amount of Zr and Zn doping was found to be useful to reduce the size of Eu211 particles, whereas it showed adverse effects on the dispersion of Eu211 particles and compositional homogeneity in a Eu123 matrix. In the case of Zn doping, although sample showed high Jc value larger than 104Acm−2 at magnetic field lower than 2T, a Jc value monotonically decreased at above 3T and superconductivity was disappeared at 11T. On the contrary, in spite of the fact that a Jc value of sample with 0.5at.% Zr decreased by applying only a magnetic field of 0.2T, superconductivity could be maintained up to 17T at 77K.

Influence of Precursor Composition on the Microstructure and Superconducting Properties of Dy-Ba-Cu-O filaments

Dy-Ba-Cu-O filaments have been successfully fabricated by a solution spinning method. The relationship between the partial melting temperature and the transport Jc value at 77 K of the filamentary sample was systematically investigated. Two kinds of precursor filaments with starting composition of Dy:Ba:Cu = 1.18:2.12:3.09 (sample A)and Dy:Ba:Cu = 1.00:2.00:3.00 (sample B) were partially melted in 1%O2 + Ar atmospheric gas and oxygenated in pure 100% O2 gas. Samples partially melted at a wide temperature range of 990-1040 °C had Jc values higher than 104 A/cm2. Both sample A and sample B partially melted at 1020 °C exhibited the maximum Jc value higher than 4.2 × 104 A/cm2 and 2.0 × 104 A/cm2, respectively. These samples had a dense microstructure consisting predominantly of Dy123 and finely dispersed Dy211 particles. The Dy211 particles with a diameter of about 1µm were finely dispersed in sample A, while the particles with a diameter of about 5µm were observed in sample B. The Jc values of both samples were maintained about 2.0 × 103 A/cm2 up to 14 T.

Effect of Zr and Zn Doping on Critical Current Density of Filamentary Dy-Ba-Cu-O Superconductors

The effect of Zr and Zn doping on transport critical current density and microstructure of filamentary Dy-Ba-Cu-O superconductor was investigated. Precursor filaments prepared by a solution spinning method were partially melted in atmosphere gas and oxygenated. Samples doped with Zr and Zn showed dense microstructure, and finely dispersed Dy2BaCuO5 particles in the Dy123 matrix were observed. It was found that the superconducting properties of Dy123 filaments doped with Zr and Zn were strongly dependent on the heating condition and the atmosphere. A high Jc value more than 104 A/cm2 with good reproducibility was obtained when these samples partially melted in flowing 20%O2 + Ar gas. By controlling the heat treatment condition, the maximum Jc value of 2.7 × 104 A/cm2 at 77 K and self-field were attained for the sample doped with 0.1 at % Zr. In the case of the sample doped with 0.1 at % Zn, the Jc value around 2.5 × 104 A/cm2 was obtained, which was comparable with that of sample without doping. The relation between the field dependence of Jc and microstructure of the filamentary sample was also examined.

Effect of Zr Addition on the Field Dependence of Transport&amp;lt;tex&amp;gt;$rm J_rm c$&amp;lt;/tex&amp;gt;for Filamentary&amp;lt;tex&amp;gt;$(rm Nd_0.33rm Eu_0.38rm Gd_0.28)rm Ba_2rm Cu_3rm O_rm x$&amp;lt;/tex&amp;gt;Superconductors

We have studied the effect of Zr addition on the field dependence of transport J/sub c/ for filamentary (Nd-Eu-Gd)Ba/sub 2/Cu/sub 3/O/sub x/ superconductors to enhance the flux pinning. We prepared the filamentary (Nd/sub 0.33/Eu/sub 0.38/Gd/sub 0.28/)Ba/sub 2/Cu/sub 3/O/sub x/Zr/sub y/ (y=0, 0.001, 0.002) precursors by a solution spinning method. The precursor was partially melted in flowing 0.1%O/sub 2/+Ar under various heating conditions to obtain high J/sub c/ value. The optimum heating condition was dependent on sample diameter. A maximum J/sub c/ value of 3/spl times/10/sup 4/ A/cm/sup 2/ at 77 K and self-field was attained for the sample with 0.001 at% Zr. The samples had well aligned texture along the filament diameter as well as the length. The J/sub c/ was measured at 77 K in applied magnetic fields up to 14 T by rotating the sample along the direction perpendicular to the filament length. Anisotropic behavior of the field dependence of J/sub c/ was detected. Although the J/sub c/ values measured at the optimum angle for the samples with 0.001 at% Zr decreased with increasing the applied fields above 10 T, the J/sub c/ values for the Zr addition samples were higher than that for the non addition sample by applying the fields up to 11 T.