POLYMERS FOR ADVANCED TECHNOLOGIES
·
2016
·Vol. 28
·期 3
·367-372
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IF 1.823
Zhenling Shen,Xin Zhi,Puyu Zhang
Polysuccinimide was synthesized from maleic anhydride and urea. A polyaspartic acid derivative (PASP-Try-SEA) was synthesized from the polysuccinimide with 2 -aminoethanesulfonic acid and tryptophan. The products were characterized by UV, FTIR, 1 H NMR, TGA and PL, respectively. The results showed that the fluorescent chromophore-indolyl groups were successfully incorporated into PASP. The relationship between the fluorescence intensity and the concentration of fluorescent polyaspartic acid (FPASP) is linear with the excitation wavelength of 366 nm and 422 nm. FPASP also showed excellent scale inhibition properties with a scale inhibition rate of 78% achieved for CaCO 3 with a dosage of 9 mg/L and a significantly enhanced scale inhibition effect for CaSO 4 , achieving an inhibition rate of 98%, which were determined using the static scale inhibition method. When FPASP was added to the solution, CaCO 3 and CaSO 4 deposits showed flower patterns with floppy accumulation by scanning electron microscopy. Copyright © 2016 John Wiley & Sons, Ltd.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 292
·期 9
·2157-2172
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IF 2.41
Chen Xing Juan,Cai Jian Chong,Zhang Zheng Han,Liu Li Jia,Yang Guang Lei
A novel cross-linked chitosan-poly(aspartic acid) chelating resin was synthesized by combining chitosan and poly(aspartic acid) derivative with crosslinker. The structure and morphology of the resin containing disulfide bonds were characterized by 1 H NMR, FT-IR, Raman spectra, and SEM. Adsorption of Pb(II) and Hg(II) from aqueous solution by the resulted chelating resin was investigated in batch techniques. The result of the Raman spectra suggests that the disulfide bonds in the resin also play an important role in the adsorption of Pb(II) and Hg(II). The kinetic data were fitted to pseudo-first-order, pseudo-second-order, and intraparticle diffusion models, which is suggestive of following closely the pseudo-second-order kinetic model. Equilibrium data were fitted to Langmuir, Freundlich, and D–R isotherm models. The results of equilibrium isotherm reveal that the empirical Langmuir equation provides an accurate description of the experimental data under the studied concentration range. In addition, thermodynamic and regeneration properties of the adsorbent were also studied.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Energies
·
2024
·Vol. 17
·期 13
·3195
·
IF 3
WenLong Gao,LiWei Sun,Miao Li,XiAn Ye,QingChun Gao,DongLiang Kong,JunPu An,KuoBo Wang,Fan Yang
This paper focuses on the selection and application of scale inhibitor by studying the problem of pipeline scaling in geothermal well development. Adding scale inhibitor can effectively reduce the treatment cost and achieve a good scale resistance effect, but the commonly used polyaspartic acid scale inhibitor has problems such as poor scale inhibition effect and large use limitations. Therefore, a new modified polyaspartic acid scale inhibitor (His-Tyr-SA-PASP) was prepared using polysuccinimide (PSI) as the raw material and histidine (His), tyrosine (Tyr), and sulfonic acid (SA) as the modification reagent. When the dosage of His-Tyr-SA-PASP was 8 mg/L, the scale inhibition rate of CaCO3was 94.40%. In addition, the scale inhibition effect of His-Tyr-SA-PASP on CaCO3was better than that of PASP. At the same time, under the condition of a static experiment at 75 °C, according to the ion concentration of water samples in different scale zones, this paper also identified the ratio of four composite scale inhibitors. When the dosage of compound scale inhibitor was 100 mg/L, Sodium of Polyaspartic Acid–Diethylene Triamine Penta (Methylene Phosphonic Acid)–2-Phosphonobutane-1,2,4-Tricarboxylic Acid–Amino Trimethylene Phosphonic Acid–Copolymer of Maleic and Acrylic Acid = (10:10:5:1:9), (15:10:5:2.5:2.5), (12.5:5:10:1:6.5), and (15:5:10:4:1) and the scale inhibition rate was more than 95%. Under the condition of a dynamic experiment, the optimized composite scale inhibitor still showed a scale inhibition rate of more than 90%. It provides a useful reference for the practical application of water treatment in geothermal wells and has the prospect of industrial application.
研究领域:
化学工程
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材料科学
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环境科学
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DOI
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Jingyang Shi,Jing Lv,Jieliang Wang,Zhao Cao,Wenda Lu,Yongdan Cao,Xu Wu,Xiaoping Wang,Jiayan Tang,Zhenyue Zhang,Ru-an Chi
The flotation separation of parisite from calcium-bearing gangue minerals, such as fluorite and calcite, poses a significant challenge in the rare earth ore production process. In this study, an eco-friendly and highly selective depressant polyaspartic acid (PASP) was adopted in the flotation separation of parisite from calcite and fluorite, and its depression mechanism was investigated through various surface analysis and testing methods, including zeta potential tests, contact angle measurements, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). The flotation test results indicated that PASP significantly inhibited the flotation of fluorite and calcite, with negligible effect on parisite when using octyl hydroxamic acid (OHA) as a collector at weak alkaline pH. The artificial mixed mineral flotation proved that PASP could achieve effective flotation separation of parisite from calcite and fluorite. Zeta potential tests and FTIR analyses demonstrated that the adsorption of PASP prevented OHA adsorption on calcite and fluorite surfaces, with minimal impact on OHA adsorption on parisite surface. XPS analyses confirmed that PASP was mainly chemisorbed on the surfaces of calcite and fluorite through the chelation reaction between polar groups (–NH– and –COO − ) of PASP with the Ca 2+ on these surfaces. AFM clearly showed the agglomerative adsorption of PASP on the surfaces of fluorite and calcite. Thus, PASP could be an efficient depressant for calcite and fluorite in parisite flotation, providing novel insights into addressing rare earth ore flotation challenges.
研究领域:
矿物加工工程
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表面化学
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DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Ling Zhu,Wei Liu,Yizhou Zhang,Zhifang Wu,Yiru Wang,Yuedan Xu,Haiyan Zheng,Hongli Zhang,Mengfei Yu,Xiaoting Jin,Zhe Wang,Zihuai Zhou,Baiping Fu
Dental caries is a global oral dilemma leading to demineralization of tooth hard tissues and exposure of dentinal tubules (DTs). Multifunctional restorative strategies, including remineralization, antibacterial properties, and DT occlusion, are urgently needed for dental caries management but remain a significant challenge. Herein, the polyaspartic acid-calcium-lanthanum suspension (5 g L −1 -3.06 м-0.34 м) followed by phosphate solution (2.04 м) is adopted to conduct polyelectrolyte-cation complexes pre-precursor process. This strategy, for the first time, successfully induces La-doped intrafibrillar mineralization of collagen fibrils with lanthanum-doped hydroxyapatite (La-HAp). After sequential application of two mineralization media, the demineralized dentin is fully remineralized and the DTs are deeply occluded to a depth of 100 µm with La-HAp after 7 d of incubation in artificial saliva or oral cavity of rabbit. The remineralized dentin demonstrates antibacterial properties against cariogenic bacteria ( Streptococcus mutans ) both in vitro and in vivo, and its mechanical properties are almost restored to those of intact dentin. The mineralization media cause no apparent irritation to oral mucosa or dental pulp. Hence, this multifunctional strategy confers the remineralized dentin surface with antibacterial properties and blocks the invasion of cariogenic bacteria through DTs, providing insight into the clinical management of dentin caries accompanied by dentin hypersensitivity.
研究领域:
口腔医学
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材料科学
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生物医学工程
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DOI
PubMed
高影响因子
JOURNAL OF BIOMATERIALS APPLICATIONS
·
2021
·
IF 2.646
Qiang Li,Dongsheng Fu,Jie Zhang,Tianyang Li,Huifang Wang,Wenjuan Hou,Baolong Niu,Ruijie Guo,Yiming Liu
Encapsulation of therapeutic molecules into nanocarrier is an extensively explored strategy to treat cancer more effectively. In this study, pH-responsive targeting dual-agent delivery nanoparticles were prepared, into which hydrophilic doxorubicin hydrochloride (DOX) and hydrophobic curcumin (CUR) were entrapped. Tyrosine (Tyr) was grafted onto poly(aspartic acid) (PASP) to produce PASP-Tyr, the following reaction between hyaluronic acid (HA) and ethylenediamine (EDA) modified PASP-Tyr formed the nanocarrier HA-EDA-PASP-Tyr (HEPT), and the loading capacity was up to 50.9 ± 4.3% for CUR and 26.0 ± 1.9% for DOX. The spherical HEPT with the mean particle size of 142.9 ± 11.4 nm expanded and deformed into petaloid pattern with an increased size of about 2 µm when triggered by the acidic microenvironment. In vitro anticancer activity evaluation revealed that the co-loaded (DOX+CUR)@HEPT nanoparticles presented higher cytotoxicity against HCT-116 cells compared with that of the free combination of (DOX+CUR). Confocal laser scanning microscopy observation indicated that HEPT carrier promoted cellular uptake of drugs by means of active targeting capacity of HA ligand. With high loading capacity and tailored carrier structure, the nanoparticles formulations may offer a new strategy for cancer treatment.
研究领域:
药剂学
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肿瘤学
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生物材料
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xiangyu Jiao,Xiaona Chong,Haiyu Du,Mengyao Yang,Zhu Zhu,Zhengfeng Ma,Yongqiang Wen
This study focuses on the development and application of tea polyphenol-loaded chitosan/polyaspartic acid nanoparticles (TP@CS/PASP-Nps) embedded within polyvinyl alcohol (PVA) nanofibers to extend the shelf life of fruit. The nanofibers were fabricated using electrospinning, which enhanced the stability and uniform dispersion of the nanoparticles. Experimental results demonstrated that the TP@CS/PASP nanoparticles exhibit significant pH and protease-responsive release of TP, with a cumulative release of 56.22 % at pH 5.0 after 120 h, compared to 26.70 % at pH 7.0. In the presence of 1 mg/mL protease, the release of TP increased by 25.31 %. Furthermore, the nanofibers displayed excellent antimicrobial properties, inhibiting the growth of Escherichia coli , Staphylococcus aureus , and Botrytis cinerea , and exhibited antioxidant activity with a DPPH scavenging rate of 43.1 % at 10 mg/mL. When applied to strawberries, the nanofibers significantly prolonged shelf life, maintaining a 0 % mold growth rate over six days compared to 100 % in the control group. This innovative packaging system presents a promising solution for the intelligent control of active substance release, offering valuable insights into the application of stimulus-responsive nanoparticles in food preservation.
研究领域:
食品科学
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材料科学
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生物技术
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DOI
PubMed
高影响因子
MATERIALS LETTERS
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2014
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IF 2.269
Caidan Zhang,Shaohua Wu,Xiaohong Qin
Stable pH-sensitive poly(aspartic acid) (PASP) hydrogel in nanofibrous structure was successfully manufactured. Firstly, polysuccinimide (PSI), the intermediate of PASP, was synthesized by thermal polymerization of aspartic acid and electrospun into nanofibrous mat. Secondly, imide rings on the main chains of PSI were partly opened to form crosslinking points by amino groups of ethylenediamine. Eventually, the residual imide rings of PSI were opened to obtain PASP hydrogel nanofibers by hydrolysis. The PASP hydrogel nanofibers exhibited significant hydrogel characteristics with fast swelling, high water absorption and pH-sensitivity. Durability test showed the morphological robustness and stability of PASP hydrogel nanofibers. The swelling ratio of pH-sensitive PASP hydrogel nanofibers ranged from 14.8 g/g to 128.1 g/g with the pH values increasing from 1.0 to 10.0.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 104
·102406-102412
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IF 3.289
Shuchen Shi,Xiaowei Zhao,Qian Wang,Huiting Shan,Ying Xu
A novel scale and corrosion inhibitor, polyaspartic acid/furfurylamine graft copolymer (PASP/FA), was synthesized using maleic anhydride, urea, and furfurylamine (FA) as raw materials. The structure of PASP/FA was characterized by 1H NMR. PASP/FA exhibits excellent scale inhibition performance at low concentration, and its overall performance was significantly improved as compared with polyaspartic acid. The inhibition efficiency of PASP/FA was close to 100% against CaCO3 with 1 mg L−1 inhibitor at 80 °C and reached up to 100% against CaSO4 at 70 °C when dosage of the inhibitor was 5 mg L−1. The best inhibition efficiency against Ca3(PO4)2 at 80 °C was about 96% when the concentration of inhibitor was 10 mg L−1. The maximum corrosion inhibition efficiency at 45 °C was as high as 30%, when 16 mg L−1 of inhibitor was adopted. When the temperature was 50 °C and a pH = 9, the best dispersion capacity for Fe2O3 (according to 69% of transmittance) was reached when 48 mg L−1 of inhibitor was applied in the tested system. The structure and morphology of CaCO3 and CaSO4 were observed by scanning electron microscopy (SEM) and X-ray powder diffraction (XRD).
研究领域:
材料化学
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工业化学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 45
·
IF 1.768
Xiaoyu Sun,Junping Zhang,Chengxian Yin,Juantao Zhang,Jiao Han
Scale deposition, which severely damages oil exploration, is a difficulty encountered in oil fields. Scale inhibitors are widely used for controlling scales. Poly(aspartic acid) (PASP) is attracting more and more attention with increasing environmental concern and discharge limitations. However, PASP's poor inhibition in a high-temperature environment markedly limits its wide use. Thus, poly(aspartic acid)–tryptophan grafted copolymer (PASPTR) was synthesized to improve the inhibition efficiency of PASP. The results show that the reactant of PASPTR has a great effect on its inhibition performance. PASPTR was found to inhibit the precipitation of CaSO 4 close to 90% at concentrations as low as 0.4 mg/L at 50°C. The inhibition efficiency of PASPTR against CaCO 3 was close to 100% with the concentration of 2 mg/L at 50°C. Scanning electron microscopy and X-ray diffraction analyses, which showed the morphological and crystal structural changes of CaCO 3 and CaSO 4 precipitation, verified the excellent inhibition performance of PASPTR. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42739.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-11
·
IF 3.8
Yumang Zhang,Yongheng Wang,Chengyu Wang,Yunhang Gao,Shuxia Liu,Zhonglei Xie,Hongyan Chang
Using polyaspartic acid (PAsp) and bentonite (BT) as the main raw materials, a new type of degradable soil water retaining agent (PAsp-AA/BT) was synthesized by microwave radiation. The optimum synthesis conditions and comprehensive properties of PAsp-AA/BT were discussed and the structure and surface characteristics of PAspsp-AA/BT were characterized by FTIR, SEM, XRD and TGA in the paper. The results showed that the optimum synthesis conditions of PAsp-AA/BT were as follows: the dosages of polyaspartic acid (PAsp), bentonite (BT), initiator potassium persulfate, crosslinking agent N , N ′-methylene bisacrylamide was 5, 3, 0.3, 0.03%, respectively, the neutralization degree of acrylic acid was 75%, and the microwave power was 490W. Under this condition, the absorption ratio of the synthesized PAspsp-AA/BT in deionized water and 0.9% NaCl solution was 953 and 164 g/g, respectively. The synthesized PAsp-AA/BT had a high water absorption rate, good water retention and repeated water absorption, and the degradation rate in soil within 30 days reached 32.75%, with good degradation effect. The analysis of SEM, FT-IR, XRD and TGA showed that: the surface of PAsp-AA/BT was rough and had obvious pore structure, which was conducive to the diffusion of water molecules; polyaspartic acid, bentonite and acrylic acid were polymerized; the cross-linking structure was formed between polyaspartic acid, bentonite and acrylic acid; the product of PASP-AA/BT had good thermal stability. This study provides a new soil water retaining agent, which is helpful for the better development of soil water retaining agent research.
研究领域:
材料科学
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环境科学
·
农业科学
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DOI
PubMed
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Yifang Gao,Hui Han,Wenjing Lu,Yuan Jiao,Yang Liu,Xiaojuan Gong,Ming Xian,Shaomin Shuang,Chuan Dong
Efficient room-temperature phosphorescence (RTP) of carbon dots (CDs) usually is seriously limited to appropriate solid matrix or introduced heavy atoms responsible for promoting intersystem crossing and suppress vibrational dissipation between singlet and triplet states. So, facile preparation efficient RTP of CDs with nonmatrix is still a highly difficulty and challenging task. Here, we first reported a subtle strategy to induce highly efficient free-matrix RTP of nitrogen-doped CDs (NCDs). The NCDs are composed of a core and hydrophilic surface of polyaspartic acid chains arising from high-temperature polymerization by a one-pot heating treatment of l-aspartic acid and d-glucose. The obtained NCDs have an ultralong phosphorescence lifetime of 747 ms and a high phosphorescence quantum yield (PQY) of 35% under 320 nm excitation in air. To the best of our knowledge, the PQY is currently the highest values recorded for RTP of CDs. The facile preparation and unique optical features offer these NCDs potential application in numerous applications, such as anticounterfeiting and white light-emitting diodes.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）