LANGMUIR
·
2026
·
IF 4.4
Xiaoxia Zheng,Yong Zhang,Feng Huang,Jie Qi,Ziteng Yang,Zheng Zhang,Hongsheng Lu
The growing demand for petroleum has intensified the pressure on conventional resources, driving exploration into unconventional reservoirs. Polyacrylamide (PAM) emulsion drag reducers can suppress fracturing fluid turbulence and improve reservoir stimulation, but their poor dissolution efficiency remains a key obstacle to widespread application. Herein, a pH-responsive Gemini surfactant (PA/OA) featuring a rigid piperazine ring as the hydrophilic headgroup was synthesized using piperazine (PA) and oleic acid (HOA). The PA/OA-stabilized monomer emulsion exhibited excellent stability for over 50 days at pH 7.0, enabling the successful inverse emulsion polymerization of PAM. The introduction of the piperazine ring and double hydrophobic tails enhances the molecular rigidity to promote a tight arrangement at the oil–water interface, thereby reinforcing the interfacial film and enhancing the interfacial activity. The surface activity of PA/OA varied at different pH conditions due to the interionic proton transfer between OA and PA. The pH-responsive ionic bonds in PA/OA facilitate rapid release of emulsion drag reducers, with most released within 30 s at pH = 10.0, and achieve a drag reduction rate of 68% at a concentration of 0.05 wt %. The PA/OA-stabilized emulsion effectively reconciled the conflict between long-term storage stability and rapid release performance encountered in single-chain-responsive surfactant systems.
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LANGMUIR
·
2025
·
IF 3.9
Yong Zhang,Xiangyang Yan,Qiao Li,Jie Qi,Xingyu Lin,Ziteng Yang,Li Wang,Hongsheng Lu,Zheng Zhang
The introduction of stimuli-responsive surfactants effectively avoids the contradiction between the stability of the emulsion and the rapid release of the drag reducer, but the single-tailed chain structure limits the storage stability and the release rate of the switching emulsion drag reducer. Adding response sites on gemini surfactants to enhance the release rate of drag reducers and strengthen the storage efficiency of the emulsions is an effective strategy. Herein, a dual dynamic covalently bonded-based gemini surfactant (DF-PEG200/OAC) was synthesized by poly(ethylene glycol) 200 (PEG200), 4-carboxybenzaldehyde (DF), and oleylamine (OAC). The two tails of DF-PEG200/OAC enhanced the stability of the switching emulsion drag reducer and provided sufficient response sites, thereby intensifying the release of the drag reducer. The reorganization and decomposition of the imine bond on DF-PEG200/OAC was realized at different pH, thus endowing the DF-PEG200/OAC-stabilized monomer emulsion with controllable stability. Using the monomer emulsion as the inverse emulsion polymerization template, a switching emulsion drag reducer was obtained without delamination or demulsification within 30 days. When the pH of deionized water is 4.7, the switching emulsion drag reducer was completely dissolved in 30 s. At a concentration of 0.05 wt % of the switching emulsion drag reducer, the drag reduction rate reached 69.64%. We believe that the construction of a switching emulsion is expected to provide a new option for the development of drag reducers.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Xuejia Nie,Sijia Yang,Yilin Liu,Zhaoqiang Wu
Although polyethylene terephthalate (PET) materials have been widely applied in many fields, such as food packaging containers, fiber textiles, electronic components and medical devices, owing to changes in ambient temperature or humidity, the surface of PET materials is prone to fog during use, which limits their application in the field of high light transmittance requirements. In this study, a new strategy for constructing transparent, water-resistant and scratch-resistant PET antifogging coatings based on P(HEAA- co -THFA- co -ITA) copolymers is proposed. The copolymer is first synthesized via radical copolymerization of 2-hydroxyethyl acrylamide (HEAA), tetrahydrofuran acrylate (THFA) and itaconic acid (ITA) in aqueous solution. Afterward, the copolymer solution was coated on the surface of the PET substrate, and a transparent anti-fog coating formed after thermal curing treatment. In the copolymer coating, the hydrophilic PHEAA chain segment is rich in amide and hydroxyl groups, which endows the material with excellent hydrophilicity and antifogging functions. The hydrophobic component PTHFA not only inhibits the swelling of the coating caused by water absorption but also enhances the adhesion between the coating and the PET material. Moreover, the PITA segment endows the coating with good water resistance stability and scratch resistance through multiple intermolecular hydrogen bonds involving carboxyl-carboxyl, carboxyl-hydroxyl and carboxyl-amide groups. The experimental results show that the prepared transparent coating has excellent antifogging performance in both the hot steam method and the freeze warm test. There was no coating peeling after the quartz sand wear test under dry conditions or after approximately 40 wet cloth wiping experiments under wet conditions, indicating that the coating has good scratch resistance. After boiling in 80°C water for 30 min, the coating maintained 85% light transmittance and outstanding antifogging performance, demonstrating excellent water resistance and thermal stability. Therefore, this copolymer antifogging coating has promising application prospects.
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Small Methods
·
2023
·
IF 12.4
Sha Cheng,Cheng Huang,Wen Chen,Pengchao Zhang
Directional liquid spreading has an irreplaceable role in applications such as microfluidic devices, disposable biosensors, and point-of-care diagnostics. However, how to achieve directional, rapid, and complete spreading (i.e., superspreading) of liquids without external energy input is a great challenge. Herein, inspired by the peristome surface of Nepenthes pitcher, the directional superspreading of water droplets on hydrogel surfaces with predesigned microchannels by using the synergistic effect of the liquid-like property of hydrogels and the guidance of anisotropic microstructures is reported. Compared with the smooth ones, hydrogel surfaces with isotropic microstructures can facilitate the superspreading of water droplets, which can be realized within 500 ms in the absence of external forces. Furthermore, directional superspreading and the flow of water droplets are realized under the guidance of anisotropic microgrooves. Such a unique spreading behavior can also be observed on the hydrogel surfaces with various shaped microchannels, such as periodic, bent, shunted, divergent, and confluent morphologies, which have potential for the development of open microfluidic platforms for various healthcare-related applications.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Shi-Long Xu,Peng Yin,Lu-Jie Zuo,Shi-Yi Yin,Yue Lin,Wanqun Zhang,Sheng-Qi Chu,Hai-Wei Liang,Xian-Zhu Fu
Proton exchange membrane fuel cells (PEMFCs) as electrochemical-generating devices with zero contaminants can promise a carbon-neutral future, but the usage of the costly platinum group metal catalysts hindered the widespread adoption of PEMFCs. Here, we present the synthesis of a highly active low-Pt PtCu3 intermetallic oxygen reduction catalyst via a sulfur-containing inorganic salt-assisted strategy. We identify that the success of the catalyst synthesis lies in the use of inorganic negative bivalent sulfur salts that leads to the formation of the CuS2 intermediate at low temperatures. The CuS2 intermediate serves as a passivator and releases Cu source at high temperatures to facilitate the formation of the PtCu3 intermetallic catalyst. The prepared small-sized PtCu3 intermetallic catalyst exhibits a high mass-based activity of 3.0 A mgPt–1 and a large electrochemically active surface area of 74 m2 gPt–1 for oxygen reduction, along with an outstanding durability (18% mass activity loss after 30,000 cycles).
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Guoguang Chen,Yaxin Zhou,Jie Dai,Shiyu Yan,Wenjun Miao,Lili Ren
Deep burns often do not heal easily, because the dermis of the skin is severely damaged, leading to severe inflammation and bacterial infection. Therefore, it is of great clinical significance to develop a dressing that promotes the healing process of deep burn wound. In this study, we used N-isopropyl acrylamide, sodium alginate and calcium chloride as the main materials, a series of calcium alginate/ poly (N-isopropyl acrylamide)(NIPAAm) hydrogel (CAPH) with different component ratios were synthesized. Its swelling properties, temperature response properties, rheological properties, biocompatibility properties, and in vitro drug release properties were investigated. Based on the above conditions, the CAPH(sodium alginate:NIPAAm = 2:15) with the best comprehensive performance was selected, which has a good biocompatibility. In addition, 0.02 % ( w / v ) mupirocin was loaded in CAPH. The temperature-responsive property of PNIPAAm in CAPH at 34 °C not only allowed the CAPH to rapidly release the drug under to prevent infection, but also to assist in wound contraction. Application of CAPH to localized wounds of deep second-degree burns in mice showed a faster healing rate and tissue regeneration. At the same time, collagen recovery was enhanced, collagen bundles were arranged in an orderly manner, and the scarring was not obvious after 16 days. Therefore, this research prepared a new safe and effective biomaterial.
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POLYMER
·
2023
·
IF 4.6
Zhenhui Bai,ZhengQi Wang,Jie Jia,Dequn Wu,Xueli Wang,Jianyong Yu,Ruchao Yuan,Faxue Li
The charring enhancement of polymers at high temperatures is essential for improving their anti-dripping, flame inhibition and smoke suppression performance. In this work, a highly thermostable and charring phosphorus-nitrogen (P/N)-based flame retardant (HMCP), which can boost the char-forming of poly(ethylene terephthalate) (PET) was synthesized. Amazingly, melt-dripping of PET was completely suppressed as 4 wt% of HMCP was added. For PET composite with 8 wt% of HMCP (PET/HMCP8), its limiting oxygen index increased to 33.6% and the flame self-extinguished within 5 s. Besides, the after-flame time and total smoke production of PET/HMCP8 were reduced by 96.1% and 39.5% respectively compared with pure PET. The enhanced fire safety of PET/HMCP composites was attributed to the barrier effect and the dilution effect produced by the synergism of P/N-based heterocycle and benzimidazole groups. Additionally, PET fabric woven with the filaments prepared by the melt spinning of PET/HBCP4 presented pleasing fire safety and mechanical properties .
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Foods
·
2023
·Vol. 12
·期 11
·2222
·
IF 5.2
Shihua Mai,Yue Ma,Hongsheng Liu,Chao Li,Yuqing Song,Kaizhen Hu,Xinyan Chen,Ying Chen,Wei Zou
To improve the fresh-keeping of highly perishable fruits with high commercial value, a novel starch-based foam packaging material was developed in this study. The foam incorporated the antiseptic ingredient Na2S2O5, which chemically interacted with environmental moisture to release SO2as an antifungal agent. Scanning electron microscopy (SEM), moisture absorption and mechanical measurements were used to characterize the unique sandwich-like inner structure of the foam which allowed for the modulable release of SO2. The starch-based foam exhibited sufficient resilience (~100%) to provide ideal cushioning to prevent physical damage to fresh fruits during transportation. When 25 g/m2of Na2S2O5was applied, the foam stably released over 100 ppm SO2and demonstrated satisfactory antifungal performance (inhibition over 60%) in terms of maintaining the appearance and nutritional values (such as soluble solids 14 vs. 11%, total acidity 0.45 vs. 0.30%, and Vitamin C 3.4 vs. 2.5 mg/100 g) of fresh grapes during a 21 day storage period. Additionally, the residual SO2(14 mg/kg) also meets the safety limits (<30 mg/kg). These research findings suggest great potential for the utilization of this novel foam in the food industry.Keywords:starch-based foam package;sandwich-like inner structure;cushioning;antisepsis;fresh-keeping
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Science China-Chemistry
·
2023
·
IF 9.6
Zhao Haitao,Bian Guoqing,Xu Xiang,He Weiwei,Zhang Lifen,Cheng Zhenping
Developing a new type of photocatalyst (PC) and catalytic mechanism for near-infrared (NIR) photocontrolled reversible-deactivation radical polymerization (RDRP) system is charming but challenging. Herein, a novel PC of the persistent radical anion (PRA) (possessing the properties of both radical and anion) was developed for NIR photocontrolled reversible addition-fragmentation chain transfer (RAFT) polymerization, enabling successful polymerization while gaining a deep insight into the mechanism of photo-induced electron transfer RAFT (PET-RAFT) polymerization. Different from the conventional and well-accepted reductive quenching (RQ) pathway, in which the radical anion intermediates of PCs (PCs •− ) must be generated in an excited state (ES), here, the PRA (3,4,9,10-perylenetetracarboxylic dianhydride radical anion (PTCDA •− )) could generate conveniently in situ in the ground state (GS) and subsequently serve as highly efficient PC in the NIR region (740–850 nm). The successful implementation of this strategy elucidates the peculiar role played by light and the real way of electron transfer behaviors. In fact, the transfer of a single electron from PRA to chain transfer agent (CTA) and cleavage of the C–S bonds is a process from ES to GS, rather than always from GS (PCs •− ) to GS (CTA) in the RQ pathway as is well known to all. In addition, the excellent spatial-temporal control and powerful penetration ability of the NIR light were also confirmed by this PRA-catalyzed polymerization system.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Keming Zhang,Xiaochan An,Yan Bai,Chong Shen,Yinpeng Jiang,Yunxia Hu
Forward osmosis (FO) technology has drawn increasingly research interests in juice concentration due to its great advantages in producing high-quality concentrated juice. However, the lack of suitable draw solutes is a significant obstacle hindering the practical application of FO for juice concentration. In this work, a series of food preservatives were systematically investigated as draw solutes in the FO system. By careful evaluation of these preservatives, we selected 4 M sodium diacetate (SDA) as one model of draw solution to concentrate grape juice in a 72-h continuous FO test. The concentrated grape juice with 5.14 folds was obtained with no loss of the titratable acidity and the vitamin C content. Moreover, the SDA accumulation in the concentrated product was only 2.0 ± 0.1 g/kg, after being diluted to regenerate juice, the preservative concentration in juice is 0.39 g/kg, which is lower than the safety limit of SDA (0.5 g/kg, FAO). Our findings demonstrate the application potential of the preservative draw solutions for juice concentration in the FO.
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Micromachines
·
2021
·Vol. 12
·期 2
·110
·
IF 2.891
Yongsong Tan,Kamen Ivanov,Zhanyong Mei,Hui Li,Huihui Li,Ludwig Lubich,Chaoxia Wang,Lei Wang
The trends of wearable health monitoring systems have led to growing demands for gait-capturing devices. However, comfortability and durability under repeated stress are still challenging to achieve in existing sensor-enabled footwear. Herein, a flexible textile piezoresistive sensor (TPRS) consisting of a reduced graphene oxide (rGO)-cotton) fabric electrode and an Ag fabric circuit electrode is proposed. Based on the mechanical and electrical properties of the two fabric electrodes, the TPRS exhibits superior sensing performance, with a high sensitivity of 3.96 kPa-1 in the lower pressure range of 0–36 kPa, wide force range (0–100 kPa), fast response time (170 ms), remarkable durability stability (1000 cycles) and detection ability in different pressures ranges. For the prac-tical application of capturing plantar pressure, six TPRSs were mounted on a flexible printed circuit board and integrated into an insole. The dynamic plantar pressure distribution during walking was derived in the form of pressure maps. The proposed fully-textile piezoresistive sensor is a strong candidate for next-generation plantar pressure wearable monitoring devices.Keywords:textile piezoresistive sensor (TPRS);rGO-cotton fabric electrode;Ag fabric circuit electrode;insole;dynamic plantar pressure
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Food Analytical Methods
·
2021
·Vol. 14
·期 6
·1121-1132
·
IF 3.366
Sun Chao,Gao Xiaoqi,Wang Lei,Zhou Nan
Reactive nitrogen species (RNS) are vital signaling molecules involved in most physiological and pathological processes. Within RNS, nitric oxide (NO) and its metabolite nitrite (NO 2 − ) have been widely applied in medicinal, food, and environmental fields. However, at present, the methods of detecting RNS by fluorescence quenching through chemical reactions have disadvantages, such as long reaction time and weak anti-interference ability. In response to these existing problems, we have developed a novel fluorescent probe, namely, carbon quantum dots (CDs) that are passivated by benzylamine. The obtained CDs (named B-CDs) possess excellent down- and upconversion properties. In particular, upconversion is used to sensitively and selectively measure NO and NO 2 − under different pH conditions in aqueous media via two different mechanisms (static and dynamic quenching). At pH 7.4, the nanomolar concentration of NO, produced from sodium nitroprusside (SNP) in a concentration-dependent manner, can be rapidly detected with a correlation coefficient ( R 2 ) greater than 0.99. Similarly, the quantitative detection of NO 2 − at pH 1.6 also shows a good linear relationship with a linear range of 0–14 μM, and a limit of detection (LOD) that is as low as 43 nM and 0.65 μM at excitation wavelengths of 800 nm and 375 nm, respectively. Notably, this probe stands out due to its extremely short response time and outstanding selectivity and anti-interference ability against a variety of common interfering substances, while realizing the fast and highly selective and sensitive detection of NO and NO 2 − . Finally, this probe has been successfully applied to the sensing of NO in fetal bovine serum (FBS) samples and NO 2 − in milk and tap water samples. Graphical abstract
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危险品化学品经营许可证（带存储）