Zhang, Kai

[["dc.bibliographiccitation.issue","50"],["dc.bibliographiccitation.journal","Angewandte Chemie"],["dc.bibliographiccitation.volume","130"],["dc.contributor.author","Liu, Huan"],["dc.contributor.author","Pang, Bo"],["dc.contributor.author","Garces, Renata"],["dc.contributor.author","Dervisoglu, Riza"],["dc.contributor.author","Chen, Longquan"],["dc.contributor.author","Lorenzon, Andrea"],["dc.contributor.author","Zhang, Kai"],["dc.date.accessioned","2020-05-14T13:30:04Z"],["dc.date.available","2020-05-14T13:30:04Z"],["dc.date.issued","2018"],["dc.description.abstract","Many natural materials have helical or twisting shapes. Herein, we show the formation of helical fibers with the lengths of micrometers by the evaporation‐driven self‐assembly on silicon wafers of functionalized cellulose nanowhiskers (CNWs) with surface‐attached acyl chains. The self‐assembly process and the final helical structures were affected by parameters including the wettability of substrates, dispersing solvents, the amount of 10‐undecenoyl groups, the crystallinity, the dimension of CNWs, and the length of acyl chains. In particular, surface‐acylated CNWs with a certain amount of 10‐undecenoyl groups (ca. 3.52 mmol g−1), an appropriate crystallinity (ca. 40 %), a length of about 135 nm, and a diameter of around 4 nm, preferentially self‐assembled into explicit left‐handed helical fibers from their THF suspensions on wafers. Thus, we showed novel particular self‐assembly behaviors of surface‐acylated CNWs, and we expanded the materials spectrum for the construction of helical structures."],["dc.identifier.doi","10.1002/ange.201808250"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65434"],["dc.language.iso","en"],["dc.title","Helical Fibers via Evaporation-Driven Self-Assembly of Surface-Acylated Cellulose Nanowhiskers"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","092111"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Physics of Fluids"],["dc.bibliographiccitation.volume","33"],["dc.contributor.author","Sun, Lijie"],["dc.contributor.author","Lin, Shiji"],["dc.contributor.author","Pang, Bo"],["dc.contributor.author","Wang, Yile"],["dc.contributor.author","Li, Erqiang"],["dc.contributor.author","Zu, Xiaotao"],["dc.contributor.author","Zhang, Kai"],["dc.contributor.author","Xiang, Xia"],["dc.contributor.author","Chen, Longquan"],["dc.date.accessioned","2021-12-01T09:21:01Z"],["dc.date.available","2021-12-01T09:21:01Z"],["dc.date.issued","2021"],["dc.identifier.doi","10.1063/5.0058512"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/94323"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-478"],["dc.relation.eissn","1089-7666"],["dc.relation.issn","1070-6631"],["dc.title","Water sprays formed by impinging millimeter-sized droplets on superhydrophobic meshes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2070241"],["dc.bibliographiccitation.issue","44"],["dc.bibliographiccitation.journal","Small"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Liu, Huan"],["dc.contributor.author","Pang, Bo"],["dc.contributor.author","Tang, Qiyun"],["dc.contributor.author","Müller, Marcus"],["dc.contributor.author","Zhang, Hua"],["dc.contributor.author","Dervişoğlu, Riza"],["dc.contributor.author","Zhang, Kai"],["dc.date.accessioned","2021-12-08T12:27:17Z"],["dc.date.available","2021-12-08T12:27:17Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1002/smll.202070241"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/95307"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-476"],["dc.relation.eissn","1613-6829"],["dc.relation.issn","1613-6810"],["dc.title","Multiresponsive Janus‐Like Films: Self‐Assembly of Surface‐Acylated Cellulose Nanowhiskers and Graphene Oxide for Multiresponsive Janus‐Like Films with Time‐Dependent Dry‐State Structures (Small 44/2020)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","S0001868621001639"],["dc.bibliographiccitation.firstpage","102522"],["dc.bibliographiccitation.journal","Advances in colloid and interface science"],["dc.bibliographiccitation.volume","296"],["dc.contributor.author","Pang, Bo"],["dc.contributor.author","Liu, Huan"],["dc.contributor.author","Zhang, Kai"],["dc.date.accessioned","2021-10-01T09:57:54Z"],["dc.date.available","2021-10-01T09:57:54Z"],["dc.date.issued","2021"],["dc.identifier.doi","10.1016/j.cis.2021.102522"],["dc.identifier.pii","S0001868621001639"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/89940"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-469"],["dc.relation.issn","0001-8686"],["dc.title","Recent progress on Pickering emulsions stabilized by polysaccharides-based micro/nanoparticles"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","16323"],["dc.bibliographiccitation.issue","50"],["dc.bibliographiccitation.journal","Angewandte Chemie. International Edition"],["dc.bibliographiccitation.lastpage","16328"],["dc.bibliographiccitation.volume","57"],["dc.contributor.author","Liu, Huan"],["dc.contributor.author","Pang, Bo"],["dc.contributor.author","Garces, Renata"],["dc.contributor.author","Dervisoglu, Riza"],["dc.contributor.author","Chen, Longquan"],["dc.contributor.author","Lorenzon, Andrea"],["dc.contributor.author","Zhang, Kai"],["dc.date.accessioned","2020-05-14T13:30:48Z"],["dc.date.available","2020-05-14T13:30:48Z"],["dc.date.issued","2018"],["dc.description.abstract","Many natural materials have helical or twisting shapes. Herein, we show the formation of helical fibers with the lengths of micrometers by the evaporation-driven self-assembly on silicon wafers of functionalized cellulose nanowhiskers (CNWs) with surface-attached acyl chains. The self-assembly process and the final helical structures were affected by parameters including the wettability of substrates, dispersing solvents, the amount of 10-undecenoyl groups, the crystallinity, the dimension of CNWs, and the length of acyl chains. In particular, surface-acylated CNWs with a certain amount of 10-undecenoyl groups (ca. 3.52 mmol g-1 ), an appropriate crystallinity (ca. 40 %), a length of about 135 nm, and a diameter of around 4 nm, preferentially self-assembled into explicit left-handed helical fibers from their THF suspensions on wafers. Thus, we showed novel particular self-assembly behaviors of surface-acylated CNWs, and we expanded the materials spectrum for the construction of helical structures."],["dc.identifier.doi","10.1002/anie.201808250"],["dc.identifier.pmid","30264507"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65439"],["dc.language.iso","en"],["dc.relation.eissn","1521-3773"],["dc.title","Helical Fibers via Evaporation-Driven Self-Assembly of Surface-Acylated Cellulose Nanowhiskers"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2005569"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Advanced Materials"],["dc.bibliographiccitation.volume","33"],["dc.contributor.author","Chen, Yiming"],["dc.contributor.author","Zhang, Lin"],["dc.contributor.author","Yang, Yang"],["dc.contributor.author","Pang, Bo"],["dc.contributor.author","Xu, Wenhui"],["dc.contributor.author","Duan, Gaigai"],["dc.contributor.author","Jiang, Shaohua"],["dc.contributor.author","Zhang, Kai"],["dc.date.accessioned","2021-04-14T08:29:32Z"],["dc.date.available","2021-04-14T08:29:32Z"],["dc.date.issued","2021"],["dc.identifier.doi","10.1002/adma.202005569"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/82927"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1521-4095"],["dc.relation.issn","0935-9648"],["dc.title","Recent Progress on Nanocellulose Aerogels: Preparation, Modification, Composite Fabrication, Applications"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3244"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Angewandte Chemie"],["dc.bibliographiccitation.lastpage","3251"],["dc.bibliographiccitation.volume","132"],["dc.contributor.author","Liu, Peiwen"],["dc.contributor.author","Pang, Bo"],["dc.contributor.author","Dechert, Sebastian"],["dc.contributor.author","Zhang, Xizhou Cecily"],["dc.contributor.author","Andreas, Loren B."],["dc.contributor.author","Fischer, Steffen"],["dc.contributor.author","Meyer, Franc"],["dc.contributor.author","Zhang, Kai"],["dc.date.accessioned","2020-04-27T08:52:05Z"],["dc.date.accessioned","2020-05-18T08:18:39Z"],["dc.date.available","2020-04-27T08:52:05Z"],["dc.date.available","2020-05-18T08:18:39Z"],["dc.date.issued","2019"],["dc.description.abstract","Reported here for the first time is the alkaline periodate oxidation of lignocelluloses for the selective isolation of cellulose nanocrystals (CNCs). With the high concentrations as a potassium salt at pH 10, periodate ions predominantly exist as dimeric orthoperiodate ions (H2I2O104−). With reduced oxidizing activity in alkaline solutions, dimeric orthoperiodate ions preferentially oxidized non‐ordered cellulose regions. The alkaline surroundings promoted the degradation of these oxidized cellulose chains by β‐alkoxy fragmentation and generated CNCs. The obtained CNCs were uniform in size and generally contained carboxy groups. Furthermore, the reaction solution could be reused after regeneration of the periodate with ozone gas. This method allows direct production of CNCs from diverse sources, in particular lignocellulosic raw materials including sawdust (European beech and Scots pine), flax, and kenaf, in addition to microcrystalline cellulose and pulp."],["dc.identifier.doi","10.1002/ange.201912053"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/64356"],["dc.language.iso","en"],["dc.relation.eissn","1521-3757"],["dc.relation.issn","0044-8249"],["dc.title","Structure Selectivity of Alkaline Periodate Oxidation on Lignocellulose for Facile Isolation of Cellulose Nanocrystals"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","10939"],["dc.bibliographiccitation.issue","17"],["dc.bibliographiccitation.journal","Cellulose"],["dc.bibliographiccitation.lastpage","10951"],["dc.bibliographiccitation.volume","28"],["dc.contributor.author","Liu, Huan"],["dc.contributor.author","Pang, Bo"],["dc.contributor.author","Zhang, Kai"],["dc.date.accessioned","2021-12-01T09:23:28Z"],["dc.date.available","2021-12-01T09:23:28Z"],["dc.date.issued","2021"],["dc.description.abstract","Abstract The self-assembly of cellulose nanowhiskers (CNWs) in confined geometries provides a powerful method for the fabrication of novel structures. Herein, ordered honeycomb microporous films were first prepared with surface-acylated CNWs (CNWs-SU) through the breath figure method. Resulting films showed highly porous order over large regions and the iridescent color was only displayed by their rims, which is different from traditional dish-cast CNW films showing the iridescent color over the whole area. This is mainly due to the condensation of water droplets forming three-dimensional (3D) geometry, which forced CNWs-SU to self-assemble into cholesteric architectures in confined geometry and resulted in the iridescent color of the rims after drying. The mechanism was further studied by investigating the critical influencing factors, primarily the concentration of CNW-SU suspensions, the relative humidity of the atmosphere and the surface-attached moieties. In particular, CNW-SU suspensions with a concentration of 3 mg/mL at the relative humidity of 75% preferentially formed honeycomb films with uniform pores. Too low or too high concentrations of CNW-SU suspensions or relative humidity are not preferable for uniform porous films. CNWs-SU with further immobilized octadecane or fluoroalkyl groups on their surface strongly affected the formation of uniform porous films because of higher hydrophobicity and accompanying inhomogeneous condensation of water droplets. This work provides a novel method to study the interactions of CNWs beyond the planar geometry and the formation of uniform porous films solely with CNWs with structural colors open up interesting possibilities for broad application in photonic nanomaterials. Graphic abstract"],["dc.description.abstract","Abstract The self-assembly of cellulose nanowhiskers (CNWs) in confined geometries provides a powerful method for the fabrication of novel structures. Herein, ordered honeycomb microporous films were first prepared with surface-acylated CNWs (CNWs-SU) through the breath figure method. Resulting films showed highly porous order over large regions and the iridescent color was only displayed by their rims, which is different from traditional dish-cast CNW films showing the iridescent color over the whole area. This is mainly due to the condensation of water droplets forming three-dimensional (3D) geometry, which forced CNWs-SU to self-assemble into cholesteric architectures in confined geometry and resulted in the iridescent color of the rims after drying. The mechanism was further studied by investigating the critical influencing factors, primarily the concentration of CNW-SU suspensions, the relative humidity of the atmosphere and the surface-attached moieties. In particular, CNW-SU suspensions with a concentration of 3 mg/mL at the relative humidity of 75% preferentially formed honeycomb films with uniform pores. Too low or too high concentrations of CNW-SU suspensions or relative humidity are not preferable for uniform porous films. CNWs-SU with further immobilized octadecane or fluoroalkyl groups on their surface strongly affected the formation of uniform porous films because of higher hydrophobicity and accompanying inhomogeneous condensation of water droplets. This work provides a novel method to study the interactions of CNWs beyond the planar geometry and the formation of uniform porous films solely with CNWs with structural colors open up interesting possibilities for broad application in photonic nanomaterials. Graphic abstract"],["dc.identifier.doi","10.1007/s10570-021-04245-3"],["dc.identifier.pii","4245"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/94658"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-478"],["dc.relation.eissn","1572-882X"],["dc.relation.issn","0969-0239"],["dc.title","Breath figure templated self-assembly of surface-acylated cellulose nanowhiskers confined as honeycomb films"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","1900158"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Advanced Materials Interfaces"],["dc.bibliographiccitation.volume","6"],["dc.contributor.author","Pang, Bo"],["dc.contributor.author","Liu, Huan"],["dc.contributor.author","Liu, Peiwen"],["dc.contributor.author","Zhang, Hua"],["dc.contributor.author","Avramidis, Georg"],["dc.contributor.author","Chen, Longquan"],["dc.contributor.author","Deng, Xu"],["dc.contributor.author","Viöl, Wolfgang"],["dc.contributor.author","Zhang, Kai"],["dc.date.accessioned","2020-05-18T08:15:33Z"],["dc.date.available","2020-05-18T08:15:33Z"],["dc.date.issued","2019"],["dc.description.abstract","Facile and low‐cost methods for the fabrication of superhydrophobic and superoleophilic materials to effectively separate oil/water mixtures are of great interest and significance. Especially, those with robust surfaces for the separation under harsh conditions including corrosive solutions and hot water are still very challenging. In this paper, Cu(OH)2 nanoneedles and CuO nanoplates are controllably generated on copper meshes by simply changing the oxidization time. After hydrophobic coating with polydimethylsiloxane, the as‐prepared copper meshes not only possess superhydrophobicity with static water contact angle up to 160.2° ± 2.6° and superoleophilicity but also exhibit high resistance against peeling and abrasion cycles. The superhydrophobic/superoleophilic meshes are also utilized to separate various oil/water mixtures with a high separation efficiency up to 98.89%. Moreover, a high separation efficiency of over 97% can be maintained after at least 30 separation cycles and a slight decrease in the flux caused by oil contamination is easily recoverable after rinsing with ethanol. In addition, these meshes demonstrate high separation efficiency for separating mixtures of diesel and diverse corrosive solutions or hot water (above 97 °C). These combined advantages make the meshes promising candidates for practical applications."],["dc.identifier.doi","10.1002/admi.201900158"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65466"],["dc.language.iso","en"],["dc.title","Robust, Easy‐Cleaning Superhydrophobic/Superoleophilic Copper Meshes for Oil/Water Separation under Harsh Conditions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3581"],["dc.bibliographiccitation.issue","20"],["dc.bibliographiccitation.journal","ChemSusChem"],["dc.bibliographiccitation.lastpage","3585"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Liu, Peiwen"],["dc.contributor.author","Pang, Bo"],["dc.contributor.author","Tian, Lin"],["dc.contributor.author","Schäfer, Timmy"],["dc.contributor.author","Gutmann, Torsten"],["dc.contributor.author","Liu, Huan"],["dc.contributor.author","Volkert, Cynthia Ann"],["dc.contributor.author","Buntkowsky, Gerd"],["dc.contributor.author","Zhang, Kai"],["dc.date.accessioned","2020-05-18T09:59:06Z"],["dc.date.available","2020-05-18T09:59:06Z"],["dc.date.issued","2018"],["dc.description.abstract","Many efforts have been made to isolate native nanocrystals from raw materials in the last two decades, such as cellulose nanocrystals (CNCs), but existing methods still suffer from low yields, complicated synthesis processes, and nonuniform sizes of obtained CNCs. This study concerns a facile, self-terminating, and efficient method for the formation of uniform CNCs in high yields during the periodate oxidation process within Pickering emulsions. A biphasic system containing hexane with dissolved hexylamine and an aqueous solution of sodium periodate (NaIO4 ) was used as the reaction medium. Regulated by hexylamine, owing to its limited solubility in water, the pH value of the aqueous phase was enhanced to around 9.8, leading to the precipitation of sodium orthoperiodate (Na2 H3 IO6 ) nanoplates and thus the formation of the initial Pickering emulsions. During the gradual formation of cellulose nanofibers and then CNCs, CNCs were attracted to stabilize the interface of the Pickering emulsions, which prevented further decomposition of CNCs by the oxidizing agent in aqueous suspensions. Thus, this isolation strategy secured the efficient separation of CNCs based on their own particular amphiphilic properties and achieved a high yield of up to 56 wt %."],["dc.identifier.doi","10.1002/cssc.201801678"],["dc.identifier.pmid","30126073"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65505"],["dc.language.iso","en"],["dc.relation.eissn","1864-564X"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Efficient, Self‐Terminating Isolation of Cellulose Nanocrystals through Periodate Oxidation in Pickering Emulsions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]