JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Xufa He,Kangle Jia,Longfei Yu,Huanling Li,Jinlan Xin,Xiaoshan Zheng,Junhua Ning,Haifu Wu,Linjia Huang,Wu Wen
Pickering emulsions that are stabilized by organic particles that are issued from renewable sources have attracted considerable attention. However, developing green and robust Pickering emulsions of various types via simple methods has always been an important challenge. Herein, a rosin derivative, namely, maleopimaric acid (MPA), which has three carboxylic acid groups, is used to stabilize Pickering emulsions. Various types of gel-like Pickering emulsions can be obtained by adjusting the wettability of rigid MPA by changing the pH, such as water (W) in oil (O), O/W, double, and multiple emulsions. With increasing MPA concentration and volume fraction of the oil phase, phase inversion occurs from W/O to O/W and from O/W to W/O, respectively. The formed gel-like Pickering emulsions have excellent external stimulus and mechanical stabilities and can withstand high temperature (70 °C), freeze-thaw treatment and high centrifugal forces. These outstanding properties are due to the stable interfacial film and the network structure that are formed by the self-assembly of MPA with heterogeneous ionization degrees. This study provides a natural rosin-based solid stabilizer with adjustable wettability and further advances the design of stable Pickering emulsions with various structural features based on practical application needs.
研究领域:
材料科学
·
界面化学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Gaihuan Ren,MaoXin Wang,Lei Wang,Zengzi Wang,Qianqian Chen,Zhenghe Xu,Dejun Sun
Dynamic covalent surfactants have been recently reported for preparation of pH-switchable emulsions [Sun, D. Langmuir, 2017, 33, 3040]. In this study, dynamic covalent silica (SiO2-B) nanoparticles of switchable wettability were fabricated by a pH-responsive dynamic (covalent) imine bond between hydrophilic amino silica (SiO2-NH2) nanoparticles and hydrophobic benzaldehyde molecules. The properties of SiO2-B were characterized by Fourier transform infrared spectroscopy, elemental analysis, contact angle measurement, and ζ potential measurement. The hydrophilicity and hydrophobicity of SiO2-B were shown to be readily switchable by adjusting pH between 7.8 and 3.5. At pH 7.8, SiO2-B was partially hydrophobic and adsorbed at oil–water interface to stabilize O/W Pickering emulsions, which were characterized by electrical conductivity, optical microscopy, and confocal laser scanning microscopy. Upon lowering the pH to 3.5, the dynamic covalent bond is dissociated to convert partially hydrophobic SiO2-B into highly hydrophilic SiO2-NH2 and surface-inactive benzaldehyde. Both of them desorb from oil–water interface, resulting in a rapid oil–water separation of the Pickering emulsions. Alternating stabilization and phase separation of the Pickering emulsions over 3 cycles were demonstrated by adjusting the pH. The pH-switchable Pickering emulsions show great potential in application to effective oil–water separation of emulsions.
研究领域:
材料科学
·
界面化学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2019
·Vol. 23
·期 1
·169-176
·
IF 1.672
Jian Zou,Yigang Liu,Qiuxia Wang,Hao Liu,Han Jia,Peng Lian
The dynamic noncovalent interaction between the anionic surfactant sodium dodecyl benzene sulfonate (SDBS) and 1,3-diphenylguanidine (DPG) was employed to control the interfacial activity of the surfactant. At high HCl concentration (1000 mg L −1 ), the SDBS/DPG n+ system could reduce the water/oil interfacial tension (IFT) to 10 −4 mN m −1 order of magnitude, which was much lower than the IFT values in the SDBS/DPG + system with a low HCl concentration (100 mg L −1 ) and the individual SDBS system by three and four orders of magnitude, respectively. The pH-switchable protonation of amido groups in DPG molecules determines the SDBS/DPG molecular interaction and the amplitude of IFT reduction, which was confirmed by control experiments using two other surfactants (sodium dodecyl sulfate [SDS] and dodecyl trimethylammonium bromide [DTAB]). Moreover, the investigation of the NaCl and temperature effects on the IFT indicated the intensity of mixed SDBS/DPG n+ adsorption layers at the water/oil interface.
研究领域:
化学
·
界面科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Jingmei Li,Xin Liu,Shuangli Zhang,Luying Chen,Yujie Jiang,Rongyu Li,Xianhui Yin,Youhua Long,Yue Ma,Zhuo Chen
Liquid mulch, as a novel biodegradable mulch, can keep soil temperature and moisture, and also has the advantages of being applied without terrain restriction and biodegradable. However, the biodegradation of ordinary liquid mulch is not controllable and cannot meet the needs of different crop growth periods. In this study, we formulated a liquid mulch film (LMF) with pH-controllable degradation based on furfural and carboxymethyl chitosan, with polyvinyl alcohol , xanthan gum , and biochar added to improve the resistance to water solubility. The resulting LMF exhibited better mechanical strength and decreased light transmittance , air permeability , and water vapor permeability than commercial liquid mulch film (CLF). Compared with bare soli, LMF effectively reduced soil moisture evaporation and increased soil temperature , resulting in the growth promotion of cowpeas and maize with longer and thicker roots. Moreover, citric acid spraying could promote the degradation of LMF (9.26±1.64 %) and increase the abundance of beneficial bacteria in the soil. Overall, our study designed the controlled degradable LMF, which not only enhances crop growth but also fosters sustainable agricultural development .
研究领域:
农业科学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Jie Qi,Miaomiao Qing,Yang Yang,Siwei Chen,Yong Zhang,Na Wang,Hongsheng Lu,Zheng Zhang
To balance the stability and dissolution of polyacrylamide (PAM), emulsion drag reducers dominate the successful operation of volumetric fracturing. Herein, a pH-switchable four-tailed ionic liquid surfactant (OA/Cyclen) is synthesized by oleic acid (OA) and 1,4,7,10-tetraazacyclododecane (Cyclen). The four-tailed structure of OA/Cyclen enhances the stability of the emulsion polymerization reactor and supplies enough switchable sites for triggering the intensified release of the PAM emulsion. The surface activity of OA/Cyclen varied under different pH conditions due to the interionic proton transfer between OA and Cyclen. The OA/Cyclen-stabilized monomer emulsion thus posed controllable stability. A pH-switchable PAM emulsion is produced through polymerization of this monomer emulsion, which shows a storage stability for 60 days at a pH value of 7.5. It is completely released to the aqueous solution within 20 s at a pH value of 12.03, achieving a maximum viscosity of 63 mPa·s at a polymer concentration of 0.5 wt % and a drag reduction of 61.2% at a polymer concentration of 0.05 wt %. The construction of OA/Cyclen is expected to supply an alternative for the development of drag reducer products.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2015
·
IF 2.752
Zhihu Yan,Caili Dai,Mingwei Zhao,Guang Zhao,Yuyang Li,Xuepeng Wu,Mingyong Du,Yifei Liu
A non-covalent bonding method is utilized for forming pH-switchable wormlike micelles system by mixing N -hexadecyl- N -methylpyrrolidinium bromide-based cationic surfactant and pyrocatechol. The peculiarity of this system is that it has high viscoelasticity at acidic conditions and alkaline conditions, while it shows water-like behaviors at neutral conditions. Rheology, dynamic light scattering, and cryogenic-transmission electron microscopy results revealed that the microstructure transition between spherical micelles and wormlike micelles was the fundamental cause of the pH-switchable rheological properties. The unusual rheological and micellar responses of this system to pH are caused by different binding capacity of hydrotrope to C 16 MPBr as pH varies. Fluorescence analysis and nuclear magnetic resonance result support this hypothesis.
研究领域:
胶体化学
·
物理化学
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2020
·Vol. 4
·期 9
·2635-2645
·
IF 6.788
Jin Wang,Meng Gao,Zhong-Kai Cui,Yong-Guang Jia,Sa Liu,Kai-Feng Chen,Xiaohui Chen,Yiqing Zhang,Zhou Fang,Yunhua Chen,Kaojin Wang,Huatang Zhang,Lin Wang,Li Ren
Facing the challenges posed by bacterial infection, the real-time detection of bacterial infection combined with antibacterial functions is urgently needed. Herein, we prepare thermo- and pH-responsive poly(vinyl alcohol) derivatives (PVA–TPE) bearing aggregation-induced emission luminogens of tetraphenylethene (TPE) and quaternary ammonium moieties through a facile one-pot quaternization with a tertiary amine method. Intrinsic fluorescence from TPE moieties and antibacterial functions from quaternary ammonium units can efficiently integrate the functions of “monitoring and killing of bacteria”. It is found that PVA–TPE can selectively image and kill Gram-positive bacteria at pH 7.4, while it switched to display enhanced broad-spectrum antimicrobial activity against both Gram-negative and -positive bacteria in an acidic environment (pH 5.5). Moreover, PVA–TPE exhibits low cytotoxicity on mammalian cells of L929, HepG2 and red blood cells. Furthermore, in vivo evaluations further confirmed that PVA–TPE has excellent antibacterial efficacy with no tissue damage. This study represents the first example of a pH-switchable integrated system for “monitoring and killing of bacteria” constructed through a facile one-pot quaternization method.
研究领域:
材料科学
·
生物材料
·
生物医学工程
·
微生物学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Ling Jin,Yijing Wang,Tao Xue,Jing Xie,Yesheng Xu,Yuan Yao,Xinxin Li
To prepare intelligent controllable oil/water separation materials with high mechanical stability and good recyclability, we fabricated a novel pH-controlled wettability melamine sponge by using a facile dip-coating method. The coated sponge exhibits reversibly switchable wettability between superhydrophilicity–superoleophobicity through acidic surrounding and superhydrophobicity–superoleophilicity under neutral or alkaline conditions. The as-prepared sponge possesses excellent absorption capacity (46.06–122.81 g/g) and oil/water separation efficiency (above 98%). The coated sponge also has good mechanical stability and recyclability which means it can be reused for absorption and oil/water separation. This smart porous material, which can flexibly transform wettability on demand, has great application prospects in oil/water separation.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Jiangyun Zhao,Yinglong Che,Shide Man,Minggang Shan,Xiaosan Song,Jianlin Liu,Bigui Wei
Stimuli-responsive separation materials with reversible wettability transition have been attracting increasing attention because they have excellent oil/water separation performance. In this study, a facile and environmentally friendly approach was used to produce a quartz sand filter material with pH-controllable wettability between superhydrophobicity/superoleophilicity and superhydrophilicity/underwater superoleophobicity. PEI/ZnO-SA/CS-coated quartz sand filter material (PEI/ZnO-SA/CS@QS) was fabricated by introducing ZnO nanoparticles , hydrophobic alkyl long chain, and amino group-rich hydrophilic groups into the surface of quartz sand filter material. Rich amino groups on the surface of the PEI/ZnO-SA/CS@QS has high adsorption capacity and separation efficiency of industrial Congo red dye and methylene blue . Before and after wettability conversion, the pH-controllable PEI/ZnO-SA/CS@QS was applied to separate oil/water mixtures and separate various water-in-oil emulsions and oil-in-water emulsions. In addition, PEI/ZnO-SA/CS@QS is recyclable, and 10 cycles of oil/water mixture separation of specific experiments in this study were performed, remaining unchangeable separation efficiency (>98.89%). PEI/ZnO-SA/CS@QS provides a new research direction for on-demand oil/water separation and modification of hard filter media. The resulted PEI/ZnO-SA/CS@QS has promising application prospects in on-demand oil/water separation and demulsification .
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2014
·
IF 6.451
Wei Fang,Zhuyuan Wang,Shenfei Zong,Hui Chen,Dan Zhu,Yuan Zhong,Yiping Cui
A type of pH-controllable drug carrier is demonstrated based on mesoporous silica nanoparticles and chitosan/poly (methacrylic acid), which can simultaneously serve as the surface enhanced Raman scattering (SERS) traceable drug carriers for targeting cancer cells. The pH-sensitive releasing characteristics can be achieved by coating the nanoparticles with a layer of chitosan/poly (methacrylic acid) (CS-PMAA), while strong SERS signals can be obtained from the SERS reporter tagged Ag nanoparticles in the core. Our experimental results show that doxorubicin (DOX) was effectively encapsulated into the nanocarriers and can be released in response to the ambient pH value. Specifically, an increased amount of DOX release was observed at lower pH value. In addition, the composite nanoparticles were conjugated with transferrin (Tf) to target transferrin receptor (TfR)-overexpressed cancer cells. The targeting ability as well as the intracellular location of the drug carrier was investigated through SERS mapping while the distribution of DOX was monitored by fluorescence images. The results show that the demonstrated drug carrier can simultaneously fulfill the functionalities of pH-responsive drug release, SERS-traceable characteristics and cancer cells targeting, which has a unique potential for the pH-controllable drug delivery nanosystems .
研究领域:
纳米技术
·
药学
·
癌症研究
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOMACROMOLECULES
·
2021
·
IF 6.988
Feihu Bi,Jin Zhang,Zengming Wei,Deshui Yu,Shuai Zheng,Jie Wang,Hongyu Li,Zan Hua,Hui Zhang,Guang Yang
A library of 14 dynamic glycopeptide amphiphilic dendrimers composed of 14 hydrophilic and bioactive saccharides (seven kinds) as dendrons and 7 hydrophobic peptides (di- and tetrapeptides) as arms with β-cyclodextrin (CD) as a core were facially designed and synthesized in several steps. Fourteen saccharides were first conjugated to the C-2 and C-3 positions of CD, forming glycodendrons. Subsequently, seven oligopeptide arms were introduced at the C-6 positions of a CD moiety by an acylhydrazone dynamic covalent bond, resulting in unique Janus amphiphilic glycopeptide dendrimers with precise and varied molecular structures. The kinds of hydrophilic parts of saccharides and hydrophobic parts of peptides were easily varied to prepare a series of amphiphilic Janus glycopeptide dendrimers. Intriguingly, these obtained amphiphilic glycopeptide dendrimers showcased very different self-assembly behaviors from the traditional amphiphilic linear block-copolymers and self-assembled into different glyco-nanostructures with controllable morphologies including glycospheres, worm-like micelles, and fibers depending upon the repeat unit ratio of saccharides and phenylalanine. Both glycodendrons and glycopeptide assemblies displayed strong and specific recognitions with C-type mannose-specific lectin. Moreover, these glycopeptide nanomaterials can encapsulate exemplary hydrophobic molecules such as Nile red (NR). The dye-loaded glycopeptide nanostructures showed a pH-controllable release behavior around the physiological and acidic tumor environment. Furthermore, cell experiments demonstrated that such glyco-nanostructures can further facilitate the functions of a model drug of the pyridone agent to reduce the expression of monocyte chemotactic protein-1 (MCP-1) and interleukin -1beta (IL-1β) in the primary peritoneal macrophages via encapsulating drugs. Considering all the abovementioned advantages including unique and precise structures, bioactivity, targeting, and controllable cargo release, we believe that these findings can not only enrich the library of glycopeptides but also provide a new avenue to the fabrication of smart and structure-controllable glyco-nanomaterials which hold great potential biological applications such as targeted delivery and release of therapeutic and bioactive molecules.
研究领域:
纳米技术
·
材料科学
·
生物材料
·
药学
·
生物医学工程
✓ 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）