Recent advances in sample preparation techniques in China

Abstract

Sample preparation is the procedure before instrumental analysis and significant to its effectiveness and efficiency. However, this procedure is usually time‐consuming, labor intensive, and prone to error. In the last decade, the development of sample preparation techniques has received increasing attention, especially in complex sample application. To pretreat samples faster and more effectively, advanced materials, instrumentation, and methods have been combined with typical techniques, including extraction, membrane separation, and chemical conversion techniques. Researchers in China focused on the development of simple, efficient sample preparation methods with selective enrichment and rapid separation capabilities for target analysis in complicated sample matrix and contribute almost a half of the publications in this specific field. In this review, a panorama of sample preparation techniques in China has been composed from more than 140 references, and we highlight some promising methods developed during recent years and introduce different separation materials with respect to these methods.

Advances in Studies of Boron Nitride Nanosheets and Nanocomposites for Thermal Transport and Related Applications

“…A major use of BNNs is in polymeric nanocomposites for thermal transport properties and others that take advantage of the mechanical and chemically stable characteristics. The focus here is on the former, [7,13–25,33,95,102,112,133,135–138,142–266] and those who are interested in the latter are referred to other reviews …”

“…The high oxidation resistance of BN is also critical to some of the applications, obviously unmatched by graphene nanosheets as well. As a result, there have been more recent investigations on the development of thermally conductive polymer/BNNs nanocomposites for thermal management and related uses [7,13–25,33,95,102,112,133,135–138,142–266] …”

Ultra‐Flexible, Dielectric, and Thermostable Boron Nitride‐Graphene Fluoride Hybrid Films for Efficient Thermal Management

“…[ 18–20 ] Considering the extreme fragility of the pure BNNS films, polymers were added as the framework to improve the structural integrity and mechanical properties. [ 21–23 ] However, the intrinsic low TC of polymers and the high interfacial thermal resistance (ITR) between polymer/filler surfaces cause the poor thermal transfer efficiency. [ 24 ] Much effort including chemical functionalization, [ 11 ] orientation control, [ 25 ] and fillers hybridization [ 26–30 ] were devoted to suppressing the ITR.…”

Recent progress of microfluidics in surface‐enhanced Raman spectroscopic analysis

“…How- ever, the reproducibility, selectivity, and sensitivity of the promising technique are still hard to meet the requirements of practical sample analysis. Performing sample preparation can help to eliminate matrix interference as well as isolate and preconcentrate analyte before SERS detection [1], but may also increase time consumption and operation complexity [2,3]. This issue can be addressed by introducing microfluidics into SERS analysis in different stages, from material/device fabrication, sample preparation to detection.…”